HOSPITAL BED
Cross-Reference to Prior Applications
This application claims priority to U.S. Provisional Patent Application Serial
No. 60/472,260, filed May 21, 2003, the disclosure of which is incorporated herein.
Background and Summary of the Invention
The present invention relates to a hospital bed. More particularly, the present
invention relates to a hospital bed having siderails, an articulating deck, and a
mattress.
Hospital bed and other patient supports are known. Typically, such patient
supports are used to provide a support surface for patients or other individuals for
treatment, recuperation, or rest. Many such patient supports include a frame, a deck
supported by the frame, a mattress, siderails configured to block egress of a patient
from the mattress, and a controller configured to control one or more features of the
bed.
Additional features of the present invention will become apparent to those
skilled in the art upon consideration of the following detailed description of an
illustrated embodiment exemplifying the best mode of carrying out the invention as
presently perceived.
Brief Description of the Drawings
A detailed description particularly refers to the accompanying figures in which:
Fig. 1 is a perspective view of a patient support according to the present
disclosure showing the patient support including a frame, a deck, a mattress supported
by the deck, a head board, a foot board, a pair of head end siderails, and a pair of foot
end siderail;
Fig. 2 is a side elevation view showing the mattress supported in a flat and
horizontal position; Fig. 3 is a view similar to Fig. 2 showing a head section of the deck in a raised position and the head and foot end siderails having complementary profiles;
Fig. 4 is a view similar to Fig. 3 showing the foot end siderail in a lowered
position and the head and foot end siderails having complementary profiles permitting
the foot end siderail to be lowered when the head section of the deck is raised;
Fig. 5 is a diagrammatic view showing an intermediate frame of the patient
support in a horizontal position and the deck in an articulated position;
Fig. 6 is a view similar to Fig. 5 showing the intermediate frame in the
Trendelenburg position and the deck in a substantially flat position;
Fig. 7 is a perspective view of a portion of the patient support of Fig. 1
showing portions of a caster wheel, a brake pedal in a braked position, and a brake
position detection switch;
Fig. 8 is a view similar to Fig. 7 showing the brake pedal in an un-braked
position;
Fig. 9 is a perspective view of a center or fifth wheel assembly showing the
fifth wheel assembly coupled to the frame of the patient support of Fig. 1 and a wheel
of the patient support facing in a direction parallel with the longitudinal axis of the patient support;
Fig. 10 is a view similar to Fig. 9 showing the wheel facing in a direction that
is neither parallel or perpendicular with the longitudinal axis of the patient support;
Fig. 11 is a view similar to Fig. 9 showing the wheel facing in a direction that
is perpendicular with the longitudinal axis of the patient support;
Fig. 12 is a cross-section view taken along line 12-12 of Fig. 9 showing a ball
bearing positioned in a first valley of a wheel position holder; Fig. 13 is a cross-sectional view taken along line 13-13 of Fig. 10 showing the
ball bearing positioned on a first peak of the wheel position holder;
Fig. 14 is a cross-sectional view taken along line 14-14 of Fig. 11 showing the
ball bearing positioned in a second valley of the wheel position holder;
Fig. 15 is an exploded assembly view of the caster wheel assembly;
Fig. 16 is a perspective view of portions of the deck showing the deck
including three removable deck panels;
Fig. 17 is a view similar to Fig. 16 showing the deck panels removed from the
remainder of the deck;
Fig. 18 is perspective view of the deck showing patient restraint straps coupled
to the deck;
Fig. 19 is a cross-sectional view taken along lines 19-19 of Fig. 2 showing one
of the removable deck panels including gap fillers positioned adjacent to the head end
siderails to partially fill the gap therebetween and the mattress including chamfered
corners to receive the gap fillers;
Fig. 20 is a perspective view of a portion of the patient support of Fig. 1
showing a head end deck panel, the head board, and one of the head end siderails
having curved portions that converge to partially fill gaps defined therebetween; and
Fig. 21 is a top plan view showing the curved portions of the head board and the head end siderail.
Detailed Description
A patient support 10 according to the present disclosure is shown in Fig. 1.
Patient support 10 includes a base frame 12, an intermediate frame 14 supported by
base frame 12, a deck 16 supported by intermediate frame 14, a mattress 18 supported by deck 16, a headboard 20, a footboard 22, a pair of head end siderails 24, and a pair
of foot end siderails 26. Footboard 22 is positioned over an extendable foot support.
Additional details of a suitable extendable foot support is provided in European Patent
Publication No. EP0681799 Al, titled "Blocking device for an extension relative to a
piece of furniture, and piece of furniture equipped with it," filed May 5, 1995, to
Pascal Guguin, the disclosure of which is expressly incorporated by reference herein. Base frame 12 is supported on the floor by a plurality of caster wheels 28 and a
centered or fifth wheel assembly 30. Intermediate frame 14 is coupled on each end to
extendable columns 31 which can be extended or retracted to position intermediate
frame 14 and deck 16 in the Trendelenburg or Reverse Trendelenburg positions. Additional details of suitable extendable columns is provided in French Patent
Publication No. FR2780638, titled "Hospital bed with telescoping columns," filed
July 1, 1998, to Robic Dominique, the disclosure of which is expressly incorporated
by reference herein.
Deck 16 is configured to articulate between a plurality of positions. Deck 16
includes a head section 32, a seat section 34, a thigh section 36, and a foot section 38
which are pivotably coupled together.
Head end siderails 24 are coupled to head section 32 and may be moved
between raised and lowered positions by siderail linkages 40. Additional details of
suitable siderail linkages are provided in PCT Publication No. WO 02/32271 Al,
titled "Bed with Articulated Barrier Elements," filed October 18, 2000, to Hensley et
al. and U.S. Patent No. 6,163,903, titled "Chair Bed," filed February 4, 1998, to
Weismiller et al, the disclosures of which are expressly incorporated by reference
herein. Foot end siderails 26 are coupled to intermediate frame 14 by siderail linkages
40 between thigh section 36 and foot section 38 and can also be moved between raised
and lowered positions. A control system is provided to control various functions of patient support 10.
The control system and the remainder of patient support 10 are powered by a
building's power supply through an AC plug connector 44 coupled to a building outlet
46. If AC plug connector 44 is unplugged from building outlet 46 or the building's
power is lost, patient support 10 is powered by a battery (not shown) supported by
base frame 12.
As shown in Fig. 2, head section siderail 24 include handles 50, 52, upper
portion 54, lower portion 56, and notch 58. Foot section siderail 26 includes handles
60, 62, upper portion 64, lower portion 66, and extended portion 68. Deck 16 can be moved into an articulated position, as shown in Fig. 10, by moving head section 32 in
direction 70. As shown in Fig. 3, upper portion 54 of head section siderail 24
complements upper portion 66 of foot section siderail 26 so that head section siderail
24 does not interfere with foot section siderail 26 when deck 16 is in the articulated
position.
Lower portion 56 of head section siderail 24 and lower portion 66 of foot
section siderail 26 are also shaped to correspond with one another so that a gap 72
defined between lower portions 56, 66 remains substantially constant during
articulation of deck 16. During articulation of deck 16, a gap 74 defined between upper portions 66, 52 narrows significantly while gap 72 between lower portions 60,
58 remains substantially constant. In the articulated orientation with both siderails 24,
26 in the raised position, as shown in Fig. 3, notch 58 is positioned to receive
extended portion 68 of foot section siderail 26.
As shown in Fig. 4, when foot section siderail 26 is moved to the lowered position, the curvature of upper portion 64 of foot section siderail 26 is configured to
complement the curvature of lower portion 56 of head section siderail 24. The radius
of curvature of upper portion 64 of foot section siderail 26 is configured to be
substantially centered about a pivot axis 76 of head section 32. This allows foot
section siderail 26 to be moved between the raised and lowered positions when the
deck is in the articulated position as shown in Figs. 3 and 4. A portion of the radius of
curvature of lower portion 56 of head section siderail 24 is also substantially centered
about pivot axis 76.
Head section 32 is pivotably and slidably coupled to a channel or rail 78 at
pivot axis 76 (shown in phantom). Rail 78 is coupled to intermediate frame 14. Rail
78 includes a slot (not shown) that allows pivot axis 76 of head section 32 to slide
horizontally as head section 32 is moved between the substantially coplanar position
as shown in Fig. 2 and the articulated position as shown in Fig. 3. A link 80 is
pivotably coupled on one end to head section 32 at a pivot axis 82 and coupled to intermediate frame 14 on the other end at a pivot axis 84.
Referring now to Figs. 2 and 3, as head section 32 rotates in direction 70 into
the articulated position, pivot axis 76 slides in the slot in rail 78 towards foot board
22. Additional details of rail 78 and link 80 are provided in PCT Publication No. WO
02/076266 Al, titled "Bed Equipped with a Back Elevator," filed March 26, 2002, to Gippert et al., the disclosure of which is expressly incorporated by reference herein.
Head section siderail 24 also includes angle indicator 88 which, in the
preferred embodiment, includes a slot formed in siderail 24 and a ball bearing
movable in the slot to indicate the angle of inclination of head section 32 relative to
intermediate frame 14. Head section siderail 24 also includes recessed portions 90, 92 along lower edge 94 of head section siderail 24. Recessed portions 90, 92 allow a
caregiver to comfortably stand beside patient support 10 when head section siderail 24
is in the lowered position without interfering with the care givers' feet.
Foot section siderail 26 also includes an angle indicator 96 which, in the
preferred embodiment, includes a slot formed in siderail 26 and a ball bearing
movable in the slot to indicate the angle of inclination of intermediate frame 14
relative to the floor. Position indicator 96 can be used to determine the position of
deck 16 relative to the floor during movement by columns 31. Additional description
of angle indicators 88, 96 is provided in U.S. Patent No. 6,182,310, titled "Bed Side
Rails," filed January 12, 1998, to Weismiller et al., the disclosure of which is
expressly incorporated by reference herein.
Foot section siderail 26 also includes recessed portions 98 on a lower edge
110. Recessed portions 98 are shaped to allow a caregiver to stand adjacent patient
support 10 when siderail 26 is in the lowered position. Recessed portions 98 are
shaped to eliminate or minimize contact with the caregivers' feet when he or she is
positioned next to patient support 10.
As shown in Fig. 1, the control system of patient support 10 includes siderail
controls 112 permanently coupled to head end siderails 24 and pendent controls 113
removably coupled to any of head and foot end siderails 24, 26. Additional details of
suitable siderail controls and pendant controls is provided in U.S. Patent Application
Serial No.09/750,741, titled "Hospital Bed," filed December 29, 2000, to Osborne et
al. and U.S. Patent Application Serial 60/408,698, titled "Hospital Bed," filed
September 6, 2002, to Menkedick et al., the disclosures of which are expressly incorporated by reference herein.
Siderail controls 112 are configured to actuate a shock feature of patient
support 10. Referring now to Figs. 5 and 6, when the shock feature provide by
siderail control 112 is activated, the control system flattens deck 16 to a substantially
coplanar orientation, as shown in Fig. 1, and positions deck 16 in the Trendelenburg
position simultaneously. If patient support 10 is in the articulated orientation, as
shown in Fig. 5, when siderail control 112 is activated, sections 34, 36, 38 of deck 16
are lowered to the substantially coplanar orientation and extendable column 31 at the
head end of patient support 10 is lowered while extendable column 31 at the foot end
of patient support 10 is extended to position deck 16 in the Trendelenburg position as
shown in Fig. 6. Siderail control 112 can be a momentary switch or any other suitable
user input device. In the preferred embodiment, the control system begins flattening
deck 16 and moving deck 16 into the Trendelenburg position only while the siderail
control 112 is activated when a button (not shown) is depressed.
Referring now to Fig. 18, deck 16 includes a head deck panel 114, a seat deck
panel 116, a thick deck panel 118, and a foot deck panel 120. Head deck panel 114 is
rigidly coupled to head section 34 and seat, thigh, and foot deck panels 116, 118, 120
are removable from seat and foot sections 36, 38 of deck 16. Deck panels 114, 116,
118, 120, head section siderail 24, and headboard 20 are preferably formed of blow-
molded plastic so that they are hollow. According to alternative embodiments of the
present disclosure, other suitable materials such as metal, wood, or composites may also be used.
As shown in Fig. 20, corner portions 122 of deck panel 114 is elevated to
narrow gaps 124, 126 defined between head section siderail 24 and deck panel 114
and headboard 20 and deck panel 114, respectively. Headboard 20 includes curved portions 128 and head section siderail 24 includes curved portions 130. Curved
portions 128, 130 are configured to narrow gap 132, as shown in Fig. 21, defined
between headboard 20 and head section siderail 24.
Curved portions 128, 130 and corner portion 122 of head deck panel 114
converge together to narrow gaps 124, 126, 132. In the preferred embodiment, hand
holes 134 are provided in corner portions 122 of head deck panel 114 to permit a
caregiver to grab head section deck panel 114 to move patent support 10. In the
preferred embodiment, curved portions 128, 130, and corner portion 122 are provided
at each corner of the longitudinal end of the head end of patient support 10.
According to alternative embodiments of the present disclosure, the converging
portions are also provided on the foot end of the patient support.
Referring now to Figs. 16 and 17, deck 16 and deck panels 116, 118, 120 are
shown that support mattress 18. Deck panel 116 is removably coupled to seat section
34 of deck 16 by restraint holders 138. Deck panel 116 includes openings 140 which
are sized to fit over restraint holders 138. Deck panel 116 can be removed from seat section 34 of deck 16 by lifting deck panel 116 above restraint holders 138. Deck
panels 118, 120 also include openings 140 which receive respective restraint holders
138 in the same fashion.
Deck panels 116, 118, 120 also include gap fillers 142 positioned adjacent the
ends of head and foot end siderails 24, 26. In the preferred embodiment, gap fillers
142 are semicircular-shaped or half moon-shaped and are integral with deck panels
116, 118, 120. Gap fillers 142 are positioned under mattress 18 when mattress 18 is
positioned on deck panels 116, 118, 120. As shown in Fig. 2, gap fillers 142 are
designed to narrow the respective gaps 144, 146, 148 defined between deck panels
116, 118, 120 and lower edges 76, 72 of head and foot end siderails 24, 26,
respectively. Similar gap fillers are also disclosed in PCT Publication No. WO
02/076266 Al, titled "Bed Equipped with a Back Elevator," filed March 26, 2002, to
Gippert et al. and French Patent Application No. FR 01 08540, titled "Lit Medicalise a
Plan de Couchage Amovible," filed June 28, 2001, to Barbu et al., the disclosures of
which are expressly incorporated by reference herein.
Referring now to Figs. 18 and 19, mattress 18 includes chamfered lower
corner portions 150 that extend along the length of each longitudinal side of mattress
18. As shown in Fig. 19, chamfered portions 150 permits mattress 18 to be positioned
on deck panels 114, 116, 118, 120 without interference from the gap fillers 142. As
shown in Fig. 19, gap filler 142 contacts chamfered portions 150 of mattress 18 to
prevent mattress 18 from moving laterally when positioned on deck 16. According to
an alternative embodiment of the present disclosure, the chamfered portions are only
provided at the locations of the gap fillers.
As shown in Fig. 18, restraint holders 138 extend through openings 140 in
deck panels 116, 118, 120. Restraint straps 152 are provided that are placed through
restraint holders 138 and extended around mattress 18 as shown in Fig. 1. Restraint
straps 152 are placed over a patient to secure the patient to patient support 10.
According to alterative embodiments of the present disclosure, the restraint holders do
not extend completely through the openings in the respective deck panels. Additional
details of suitable restraint holders and restraint straps are provided in French Patent
Application No. FR 01 08540, titled "Lit Medicalise a Plan de Couchage Amovible,"
filed June 28, 2001, to Barbu et al., the disclosures of which are expressly
incorporated by reference herein.
As shown in Fig. 1, the control system includes a battery enable switch 154,
which allows a person, such as a caregiver to operate the electrically controlled functions of patient support 10 using battery power when AC power is not available.
In the illustrated embodiment, one battery enable switch 154 is located on head
section siderail 24 and another battery enable switch (not shown) is located on pendent controller 113. According to alternative embodiments of the present
disclosure, the battery enable switch is located anywhere on the patient support as
necessary or convenient. Battery enable switches 154 are electrically coupled to the
battery system (not shown). Battery enable switch 154 is a momentary switch such as a push button in the preferred embodiment, although any other suitable switch could be used. In the
preferred embodiment, switch 154 includes a light emitting diode (LED) enclosed in a
translucent or transparent plastic housing. The LED is "on" (i.e., illuminated) when
either AC or battery power is being supplied to patient support 10. When patient
support 10 is disconnected from AC power, such as when a plug 44 is disconnected
from wall socket 46, switch 154 ceases being illuminated.
When AC power to patient support 10 is cutoff, a timing circuit (not shown) is
initiated. In the preferred embodiment, after patient support 10 is disconnected from
AC power for twenty minutes and any of the electrically controlled features of patient
support 10 have not been actuated for a time period of twenty minutes, patient support
10 is placed in sleep mode. In sleep mode, minimal power is provided to patient
support 10 by the battery backup system. During sleep mode, the electrical operable functions of patient support 10 are disabled.
In the preferred embodiment, when the patient support 10 is running on battery power provided by the battery, activation of one of the battery enable switches 154
causes patient support 10 to switch out of sleep mode and receive sufficient power from the battery so that at least certain electrically operational functions of patient
support 10, such as movement of patient support 10 into emergency Trendelenburg
position, can be performed. In the illustrated embodiment, battery enable switch 154
is activated by the application of pressure on one of switches 154 with ones' finger.
According to an alternative embodiment, the battery enable switches are not provided
and activating any one of the bed function control buttons while patient support 10 is
in sleep mode will switch it out of sleep mode.
In the preferred embodiment, the timing circuit waits for a predetermined time
period of twenty minutes so that if no operational activity occurs within the twenty
minute period after the battery enable switch 154 has been activated or since the
previous operational activity, patient support 10 enters sleep mode. If one of the bed
function control buttons is activated within the twenty minute time period, the timing
circuit is reset to zero. In this manner, battery power is conserved and a smaller battery can be used to support the battery system.
Battery enable switches 154 permit patient support 10 to meet regulatory
requirements by enabling at least certain of the bed's operational features to be
operable on battery backup power only when needed. According to alternative
embodiments of the present disclosure, the timing circuit can be set to enter sleep
mode after any predetermined time period, such as five minutes, one hour, etc.
Details of another suitable battery enable system is provided in U.S. Patent
Application Serial 60/408,698, titled "Hospital Bed," filed September 6, 2002, to
Menkedick et al., the disclosure of which is expressly incorporated by reference herein.
Referring now to Figs. 7 and 8, patient support 10 includes a brake alarm that
produces an audible and/or visual alarm signal when a brake 156 that locks caster
wheel 28 is moved from the braked position, as shown in Fig. 7, to the unbraked
position as shown in Fig. 8 while patient support 10 is still connected to AC power
through wall socket 46. By activating the alarm, damage to plug 44 and other
components of patient support 10 can be avoided.
Brake 156 includes a brake pedal 160 that rotates an octagonal brake shaft 158
to move brake 156 between the braked and unbraked positions. A lever 161 is
coupled to brake shaft 158 so that as brake shaft 158 rotates, lever 161 also rotates.
Additional details of a suitable brake is provided in French Patent Application FR02 02510, titled "Cadre de Dispositif a Usage Medical Ou Paramedical de Support
Roulant d'une Personne, a Roulettes Facilement Demontables, et Dispositif Ainse
Equuipe", filed February 28, 2002, to Gippert et al., and corresponding PCT
Application No. unknown claiming priority, to Gippert et al., which claims priority to
French Patent Application FR 02 02510, the disclosures of which are expressly
incorporated by disclosure herein.
A switch 162 is provided that is coupled to a brake alarm controller (not
shown) of the control system via wires 164. Switch 162 includes a spring 166
positioned adjacent to lever 161. Switch 162 is coupled to frame 24 by another spring
167. In the preferred embodiment, spring 167 is made of a resilient metallic material
to permit some movement of switch 162.
When brake 156 is in the braked position, as shown in Fig. 7, lever 161
depresses spring 166 on switch 162 to complete an electrical circuit. When brake 156 is moved to the unbraked position, as shown in Fig. 8, lever 161 is rotated away from
spring 166. Spring 166 is then biased away from electrical switch 162 and the
electrical circuit is broken. The brake alarm controller detects that the circuit has been
broken and determines that brake 156 has moved from the braked position to the unbraked position. According to alternative embodiments of the present disclosure,
the braked and unbraked positions of brake 156 are reversed or the brake alarm
controller is programmed to activate the brake alarm signal when the circuit is
completed rather than broken.
When the brake alarm controller determines that brake 156 is no longer in the
braked position, it determines if patient support 10 is still plugged into an AC power
source such as wall socket 46. If plug 44 of patient support 10 is plugged in to wall
socket 46 and receiving AC power while brake 156 is in the unbraked position, an
alarm such as an audible alarm and/or a flashing indicator light on control panel 112
will signal to warn the caregiver not to move patient support 10 until plug 44 is
removed from wall socket 46.
Referring now to Figs. 9-15, fifth wheel assembly 30 is coupled to frame 24 of
patient support 10. Fifth wheel assembly 30 is configured to assist a caregiver in
steering patient support 10 by providing a central pivot point about which to turn
patient support 10.
Fifth wheel assembly 30 includes a caster wheel 168 that rolls along the floor
and is configured to pivot or swivel about a vertical axis 170. Fifth wheel assembly
30 further includes a wheel position holder 172 configured to permit such swiveling.
However, position holder 172 also encourages or urges caster wheel 168 to remain in
predetermined orientation relative to vertical axis 170.
As shown in Fig. 9, caster wheel 168 is positioned in a first parallel position
that is parallel to a longitudinal axis 174 of patient support 10. When in this position,
caster wheel 168 is aligned to roll along the floor when patient support 10 is being
pushed in direction 176 along longitudinal axis 174 of patient support 10 such as
when patient support 10 is being pushed down a hallway. In Fig. 11, caster wheel 168 is positioned in a second perpendicular position that is perpendicular to longitudinal
axis 174 of patient support 10. When in this position, caster wheel 168 is aligned to roll along the floor when patient support 10 is being pushed in direction 178
perpendicular to longitudinal axis 174 such as when patient support is being
positioned in a room.
Positioning fifth wheel 168 parallel to or perpendicular to longitudinal axis 174 of patient support 10 allows a caregiver to easily steer patient support 10 during
movement of patient support 10 in a hallway or in a patient's room. Another suitable
fifth wheel assembly is described in French Patent No. 2783463, titled "Rolling
support for medical usage, has wheel held by bracket mounted on support shaft, carried in spring loaded sliding housing, which has lower edge profiled to fit on to
roller cam fitted to support shaft," filed September 9, 1998, to Pascal Guguin, the
disclosure of which is herein expressly incorporated by reference.
Position holder 172 is configured to permit movement of wheel 168 to either
the first parallel position or the second perpendicular position. However, if wheel 168
is positioned between these two positions, position holder 172 urges wheel 168 back
toward either the first parallel position or the second perpendicular position. Thus, if
wheel 168 is in an intermediate position as shown in Fig. 10, position holder 172
urges wheel 168 either toward the first parallel position shown in Fig. 9 or toward the second perpendicular position shown in Fig. 11.
Fifth wheel assembly 30 further includes a base 180 coupled to frame 24 as
shown in Fig. 9. In the preferred embodiment, base 180 is positioned in the middle of
frame 24 as shown in Fig. 1. According to alternative embodiments of the present
disclosure, base 180 is placed elsewhere on frame 24 such as under the center of
gravity of the patient support and/or patient.
Base 180 is saddle-shaped and includes a pair of side plates 182 and a middle
plate 184 extending between side plates 182. Side plates 182 include openings 185,
186, 188. Position holder 172 includes a saddle-shaped base 190 coupled between
side plates 182. Base 190 includes opening 192 (one not shown) corresponding to
openings 185 of side plates 182 and a bearing-receiving opening 192 as shown in Fig.
15.
Wheel assembly 30 further includes a post or stem 194 positioned to extend
through an opening 196 formed in middle plate 184 of base 180. A first upper link
198 is rigidly coupled to stem 194 and a second lower link 210 is pivotably coupled to
first upper link 198 by a rod 212. Wheel 168 is rotatably coupled to second lower link
210 by an axle 214.
Wheel assembly 30 includes a pair of gas springs or biasers 216 pivotably
coupled to upper link 198 by a first coupler 218 and pivotably coupled to lower link
210 by a second coupler 220. Gas springs 216 urges wheel 168 into contact with the
floor surface. Thus, if wheel 168 encounters a pump or depression on the floor, wheel
168 travels up or down and remains in contact with the floor.
As shown in Fig. 15, stem 194 includes an upper opening 222, an annular
channel 224, and a collar 226. Wheel assembly 30 includes an upper sleeve or
bearing 228 positioned between base 190 and an upper portion 230 of stem 194 and a lower sleeve or bearing 232 positioned between collar 226 and middle plate 184 of
base 180 when wheel assembly 30 is fully assembled as shown in Fig. 12. Bearings
228, 232 reduce the friction and wear between stem 194 and bases 190, 180. To retain
stem 194 in bases 190, 180, a pin 234 is inserted through openings 185 of base 180
and corresponding openings 192 of base 190 and passes through a portion of channel 224 of stem 194 as shown in Figs. 9-12. Because channel 224 is annular, stem 194
can rotate while pin 234 is positioned in channel 224.
As shown in Fig. 15, position holder 172 includes a first cam member 236
coupled to side plates 182, a second cam member 238 positioned to interact with first
cam member 236, and biaser or spring 237 positioned to urge second cam member 238 toward first cam member 236. First and second cam members 236, 238 cooperate
to urge wheel 168 to either the first parallel or second perpendicular positions.
First cam member 236 includes three spacers 240, two ball bearings 242, and a
pin 244. Pin 244 is inserted through opening 186 in side plates 182, spacers 240, and
ball bearings 242 to support bearings 242 above second cam member 238 as shown in
Figs. 12-14.
Second cam member 238 includes an upper collar 246 having a sinusoidal cam
surface 248, a shoulder 248, a shaft 250, and a square keyed portion 252. When fifth
wheel assembly 30 is fully assembled, second cam member 238 is positioned in
opening 222 of stem 194 and spring 237 as shown in Figs. 12-14. Lower end 256 of
passage 254 has a square profile that complements keyed portion 252 of second cam
member 238. Thus, when wheel 168 and stem 194 rotate, second cam member 238
also rotates. However, second cam member 238 can move up and down in passage
254. Shoulder 248 of second cam member 238 is positioned over spring 237 so that
second cam 238 is urged upwardly toward first cam member 236.
In the preferred embodiment, cam surface 248 on the upper end of second cam
member 238 has a smooth sinusoidal profile that includes a pair of first peaks 258, a
pair of second peaks 260, a pair of first valleys 262, and a pair of second valleys 264.
Each respective first peak 258, second peak, 260, first valley 262, and second valley
264 is positioned opposite one another about vertical axis 170 of stem 194. Peaks 258, 260 separate valleys 262, 264 so that valleys 262, 264 are spaced approximately
90° apart on cam surface 248 about axis 266.
Valleys 264 are slightly deeper than valleys 262 in the preferred embodiment.
According to alternative embodiments of the present disclosure, the cam surface has
fewer or more valleys and peaks, peaks with sharp contours or other contours to
provide other suitable profiles.
When fifth wheel assembly 30 is assembled, cam surface 248 is pushed
upward into contact with ball bearings 242 so that ball bearings 242 "roll over" cam
surface 248. Referring now to Figs. 9-11, wheel 168 can rotate 360° relative to base
180. However, because of cam surface 248, wheel 168 is urged toward one of four
positions either parallel or perpendicular to the longitudinal axis of patient support 10.
When wheel 168 is in one of the four positions, ball bears 242 are positioned
in either first valleys 262 or second valleys 264 as shown in Figs. 12 and 14. When
wheel 168 is rotated, ball bearings 242 roll up either peaks 258 or peaks 260 and
second cam member 238 is pushed down against the bias of spring 237. When
positioned on peaks 258, 260, the normal force between ball bearings 242 and cam
surface 248 have both axial and radial components. The radial components urge
second cam member 238 toward the nearest valley 262, 264. Thus, when wheel 168
is not positioned in one of the four positions, it is urged back toward the nearest of the
four positions. When ball bearings 242 ride over one of peaks 258, 260, they are urged toward the nearest valley 262, 264.
Because valleys 264 are deeper than valleys 262, the radial components of the
normal forces are greater. Thus, it is easier to move from the second perpendicular
position to the first parallel position and vice versa. Because cam surface 238 is smooth, the transition of wheel 168 from one position to position is also smooth.
To move wheel 168 from the first parallel position to the second perpendicular
position, a caregiver pushes on patient support 10 in a transverse direction. This force
creates torque on wheel 168 and urges ball bearings 242 to ride up one of peaks 258, 260. Once wheel 168 has rotated approximately 45°, ball bearings 242 are positioned
on top of peaks 258, 260. With further movement of wheel 168 about axis 166, ball
bearings 242 and wheels 168 are urged toward the second perpendicular position.
To move wheel 168 from the second perpendicular position to the first parallel
position, a caregiver pushes on patient support 10 in a longitudinal direction. This
force creates torque on wheel 168 and urges ball bearings 242 to ride up one of peaks
258, 260. Once wheel 168 has rotated approximately 45°, ball bearings 242 are
positioned on top of peaks 258, 260. With further movement of wheel 168 about axis
166, ball bearings 242 and wheels 168 are urged toward the first parallel position.
Fifth wheel 168 is rotated between being parallel to the longitudinal axis of
patient support 10 and perpendicular to the longitudinal axis of patient support 10 and
vice versa by a caregiver gently pushing patient support 10 from either one of the head
or foot end or along one of the longitudinal sides of patient support 10.
Preferably, instructions for the assembly, installation, and/or use of patient
support 10 are provided with patient support 10 or otherwise communicated to permit
a person or machine to assemble, install and/or use patient support 10. Such
instructions may include a description of any or all portions of patient support 10
and/or any or all of the above-described assembly, installation, and use of patient
support 10 or components of patient support 10. The instructions may be provided on separate papers and/or on the packaging in which patient support 10 is sold or
shipped. These instructions may also be provided over the Internet or other communication system. Furthermore, the instructions may be embodied as text,
pictures, audio, video, or any other medium or method of communicating instructions
known to those of ordinary skill in the art. The features of the present disclosure have been described with respect to
beds, but they can also be used on examination tables, stretchers, gurneys, wheel
chairs, chair beds, or any other patient support devices for supporting a person during
rest, treatment, or recuperation.
Unless otherwise stated herein, the figures are proportional. Although the
present invention has been described in detail with reference to preferred embodiments, variations and modifications exist within the scope and spirit of the
present invention as described and defined in the following claims.