|Publication number||US2556525 A|
|Publication date||12 Jun 1951|
|Filing date||8 Oct 1949|
|Priority date||8 Oct 1949|
|Publication number||US 2556525 A, US 2556525A, US-A-2556525, US2556525 A, US2556525A|
|Inventors||Drennon William M|
|Original Assignee||Drennon William M|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (58), Classifications (12)|
|External Links: USPTO, USPTO Assignment, Espacenet|
June 12, 1951 w, DRENNQN 2,556,525
. ARTIFICIAL LIMB JOINT Filed 001;. 8, 1949 FIG.
YINVENTOR ATTORNEYS WILLIAM H. mm:
BY I 74% 6 Patented June 12, 1951 UNHTED STATES PATENT Q'FFICE ARTIFICIAL LIMB JOINT William M. Drennon, South Gate, Calif.
Application October 8, 1949, Serial No. 120,336
This invention has to do with artificial limbs and has as an object the provision of an improved joint therefor. While my improved joint is particularly well suited as an ankle joint, it should be understood, of course, that I do not intend to confine its use as an ankle joint, since it is capable of providing a joint between any two relatively movable parts of an artificial limb or the like.
It is a further object of the invention to provide a joint which has flexibility approaching that of a human joint such as an ankle joint.
Another object is the provision of a joint of this character which is capable of affording maximum comfort and which is extremely durable.
A further characteristic and advantage of my invention is its simplicity and economy of manufacture.
Other objects will appear hereinafter.
Without intending thereby to limit the broader scope of my invention as defined by the appended claim, I shall now describe an embodiment thereof which I, at present, prefer, for which purpose I shall refer to the accompanying drawings, wherein:'
Fig. 1 is a view partly in section and partly in side elevation of a foot and leg joined together by my improved ankle joint; I
Fig. 2 is a section taken on line 22 of Fig. 1;
Fig. 3 is a top plan view of the outer spring element; and
Fig. 4 is a top plan view of the inner spring element.
In the drawings, I show a foot portion F and a leg portion L.
The foot portion is composed of an outer layer 5 of soft material, such as sponge rubber, and a core 6 of a relatively stiif material, such as vulcanized rubber, although it is my preference that the core possess some degree of flexibility.
Within the core I embed a spring steel anchor plate In which serves as a lower anchor or foundation for the ankle joint now to be described. The foot portion is provided with an upwardly opening socket l5 within which I mount a pair of nested, concentric spiral springs l7, I8, and atop the spring elements I provide a cup-shaped metallic anchor plate or member 2!] which extends into and is secured to the leg L. As best seen in Figs. 2-4, the upper end of the outer spring I8 is provided with a loop 22 which is secured to anchor member 20 as by a bolt 23, while the lower end of the outer spring terminates in a loop 25 secured to the anchor plate In as by bolt 26.
The upper end of the inner spring I! terminates in a loop 30 secured to the anchor member 20 by bolt 21, while the lower end of the inner spring terminates in a hook 32 secured to the anchor plate by bolt 33.
It will be observed that the top and bottom loops of the outer spring are anchored at diametrically opposite points, while the top and bottom loops of the inner spring are also anchored at diametrically opposite points. That is, the respective ends of the outer spring are anchored at points spaced 180 from each other, while the respective ends of the inner spring are also anchored at points spaced 180 from each other, and spaced from the respective anchor points of the outer spring. Thus, no matter in which direction the foot is tilted relative to the leg, the stress is communicated directly to one of the anchor points, while vertical loads are taken by the springs in compression.
While, for illustrative purposes only, a portion of the rubber is shown in Fig. 1, I prefer to embed the springs l1, H3 in that portion of the rubber core 6 which fills socket I5. Thus, the rubber to some extent shares the vertical loads with the springs and it also protects the springs from exposure and corrosion.
The sole means of anchoring the foot to the leg is through the attachment of the springs to the anchor members, although in practice the leg and foot may be provided with some sort of flexible sheathing (not shown) which might afford some degree of attachment.
From the foregoing it will be apparent that my joint permits both twisting and tilting of the foot relative to the leg, the joint is fully cushioned and it affords suflicient resistance to too free tilting and twisting of the limb.
In an artificial limb having a foot portion and a leg portion, a leaf spring embedded in the foot portion, a top anchor member secured to the leg portion, and a pair of nested spiral springs interposed between said leaf spring and said top anchor member, the upper end of the outer spring being anchored to said top anchor member and thelower end of said outer spring being anchored to the leaf spring at a point spaced from the point at which the top end thereof is anchored to the top anchor member; and the respective ends of the inner spring being anchored to said top anchor member and said leaf spring, respectively, at points spaced, respectively, 90 from the said anchor points of the outer spring.
WILLIAM M. DRENNON.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 117,733 Black Aug. 8, 1871 288,239 Ingram Nov. 13, 1883 2,453,969 Carter Nov. 16, 1948
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US117733 *||8 Aug 1871||Improvement in universal joints for shaft-couplings|
|US288239 *||10 Sep 1883||13 Nov 1883||George a|
|US2453969 *||3 Apr 1947||16 Nov 1948||Carter Edwin C||Artificial limb|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3335428 *||2 Nov 1964||15 Aug 1967||Goodrich Co B F||Resilient prosthetic foot made from elastic polymers of different hardness|
|US3754286 *||21 Jan 1972||28 Aug 1973||Ryan M||Artificial foot having ankle flexible mount|
|US3920610 *||24 Apr 1974||18 Nov 1975||Wagner Eugene||Method of making and tailoring prosthetic feet|
|US4177525 *||9 Nov 1977||11 Dec 1979||Ohio Willow Wood Co., Inc.||Reinforced artificial foot and method of making|
|US4328594 *||13 Feb 1980||11 May 1982||Campbell John W||Prosthetic foot|
|US4395783 *||16 Jul 1981||2 Aug 1983||Vessa Limited||Method of making an artificial leg|
|US4442554 *||12 Feb 1982||17 Apr 1984||Arthur Copes||Biomechanical ankle device|
|US5004477 *||20 Oct 1989||2 Apr 1991||Establissements Proteor||Prosthesis for leg amputation and a process for its manufacture|
|US5062859 *||11 Jun 1990||5 Nov 1991||Otto Bock Orthopaedische Industrie Besitz- und Verwaltungs-Kommanditgesel lschaft||Prosthetic foot having z shaped insert|
|US5156632 *||8 Nov 1991||20 Oct 1992||Otto Bock Orthopaedische Industrie Besitz- und Verwaltungs-Kommanditgesel lschaft||Jointless prosthetic foot|
|US5258039 *||15 Nov 1991||2 Nov 1993||The National University Of Singapore||Energy storing composite prosthetic foot|
|US5458656 *||20 Dec 1993||17 Oct 1995||Flex-Foot||Energy-storing prosthesis leg pylon vertical shock leg|
|US5486209 *||1 Jul 1994||23 Jan 1996||Phillips; Van L.||Foot prosthesis having auxiliary ankle construction|
|US5509938 *||4 Jan 1994||23 Apr 1996||Phillips; Van L.||Prosthetic foot incorporating adjustable bladder|
|US5514185 *||21 Jan 1994||7 May 1996||Phillips; Van L.||Split foot prosthesis|
|US5514186 *||8 Mar 1994||7 May 1996||Phillips; Van L.||Attachment construction for prosthesis|
|US5549714 *||12 Jan 1995||27 Aug 1996||Phillips; Van L.||Symes foot prosthesis|
|US5593457 *||22 Sep 1995||14 Jan 1997||Phillips; Van L.||Foot prosthesis having auxiliary ankle construction|
|US5728176 *||30 Oct 1995||17 Mar 1998||Flex-Foot, Inc.||Attachment construction for prosthesis|
|US5766265 *||7 Jun 1995||16 Jun 1998||Phillips; Van L.||Prosthetic foot having curved integral support|
|US5899944 *||23 Apr 1996||4 May 1999||Phillips; Van L.||Prosthetic foot incorporating compressible members|
|US5976191 *||8 Oct 1996||2 Nov 1999||Phillips; Van L.||Foot prosthesis having curved forefoot|
|US5993488 *||13 May 1998||30 Nov 1999||Phillips; Van L.||Prosthesis with resilient ankle block|
|US6206934||21 Aug 1998||27 Mar 2001||Flex-Foot, Inc.||Ankle block with spring inserts|
|US6280479||9 Apr 1999||28 Aug 2001||Flex-Foot, Inc.||Foot prosthesis having cushioned ankle|
|US6406500||2 Nov 1999||18 Jun 2002||Van L. Phillips||Foot prosthesis having curved forefoot|
|US6443995||22 Dec 2000||3 Sep 2002||Barry W. Townsend||Prosthetic foot|
|US6527811||16 Dec 1997||4 Mar 2003||Van L. Phillips||Foot prosthesis with modular foot plate|
|US6743260||31 Jul 2001||1 Jun 2004||Barry W. Townsend||Prosthetic foot|
|US6899737||26 Oct 2000||31 May 2005||Van L. Phillips||Foot prosthesis having cushioned ankle|
|US6936074||2 Mar 2004||30 Aug 2005||Barry W. Townsend||Prosthetic foot|
|US7063727||17 Dec 2002||20 Jun 2006||Van L. Phillips||Foot prosthesis having cushioned ankle|
|US7108723||10 Jun 2004||19 Sep 2006||Townsend Barry W||Prosthetic foot|
|US7279011||11 Feb 2004||9 Oct 2007||Phillips Van L||Foot prosthesis having cushioned ankle|
|US7354456||14 Sep 2004||8 Apr 2008||Phillips Van L||Foot prosthesis having cushioned ankle|
|US7503937 *||29 Jun 2007||17 Mar 2009||Ossur Hf||Prosthetic foot|
|US7771488||10 Aug 2010||Ossur Hf||Prosthetic foot|
|US7879110||1 Dec 2009||1 Feb 2011||Ossur Hf||Foot prosthesis having cushioned ankle|
|US8177855||15 May 2012||Ossur Hf||Prosthetic foot|
|US8685109 *||24 Mar 2009||1 Apr 2014||össur hf||Smooth rollover insole for prosthetic foot|
|US9168158||7 Mar 2014||27 Oct 2015||össur hf||Smooth rollover insole for prosthetic foot|
|US20030093158 *||17 Dec 2002||15 May 2003||Phillips Van L.||Foot prosthesis having cushioned ankle|
|US20040162623 *||11 Feb 2004||19 Aug 2004||Phillips Van L.||Foot prosthesis having cushioned ankle|
|US20040199265 *||2 Mar 2004||7 Oct 2004||Townsend Barry W.||Prosthetic foot|
|US20040225376 *||10 Jun 2004||11 Nov 2004||Townsend Barry W.||Prosthetic foot|
|US20050038525 *||15 Jun 2004||17 Feb 2005||The Ohio Willow Wood Company||Shock absorbing prosthetic foot for use with prosthetic ankle|
|US20050234563 *||14 Sep 2004||20 Oct 2005||Phillips Van L||Foot prosthesis having cushioned ankle|
|US20050284160 *||25 Jun 2004||29 Dec 2005||Johnson Controls Technology Company||Method of and apparatus for evaluating the performance of a control system|
|US20080004719 *||29 Jun 2007||3 Jan 2008||Sigurdur Asgeirsson||Prosthetic foot|
|US20090030531 *||1 Oct 2008||29 Jan 2009||Sigurdur Asgeirsson||Prosthetic foot|
|US20090043403 *||1 Oct 2008||12 Feb 2009||Sigurdur Asgeirsson||Prosthetic foot|
|US20100004757 *||24 Mar 2009||7 Jan 2010||Ossur Hf||Smooth rollover insole for prosthetic foot|
|US20100106260 *||1 Dec 2009||29 Apr 2010||Phillips Van L||Foot prosthesis having cushioned ankle|
|DE2341887A1 *||18 Aug 1973||27 Feb 1975||Ipos Gmbh & Co Kg||Kunstfuss fuer beinprothesen|
|DE3918810A1 *||9 Jun 1989||13 Dec 1990||Bock Orthopaed Ind||Gelenkloser prothesenfuss|
|EP0277175A1 *||23 Jul 1987||10 Aug 1988||Ohio Willow Wood Inc||Prosthetic foot.|
|WO2008005424A2||2 Jul 2007||10 Jan 2008||Ossur Hf||Prosthetic foot|
|WO2008005424A3 *||2 Jul 2007||12 Jun 2008||Ossur Hf||Prosthetic foot|
|U.S. Classification||623/49, D24/155, 403/229|
|International Classification||A61F2/66, A61F2/60, A61F2/50|
|Cooperative Classification||A61F2/66, A61F2002/5007, A61F2/6607, A61F2002/5076, A61F2002/6671|