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Publication numberUS3205757 A
Publication typeGrant
Publication date14 Sep 1965
Filing date11 Feb 1963
Priority date11 Feb 1963
Publication numberUS 3205757 A, US 3205757A, US-A-3205757, US3205757 A, US3205757A
InventorsEdmund H Kuennen
Original AssigneeEdmund H Kuennen
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Thumb tack
US 3205757 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

p 1965 E. H. KUENNEN 3,205,757

THUMB TACK Filed Feb. 11, 1963 INVENTOR.

E H K UENNEN United States Patent 3,205,757 THUMB TACK Edmund H. Kuennen, 6% N. Chestnut Ave., New Hampton, Iowa Filed Feb. 11, 1963, Ser. No. 257,528 1 Claim. (Cl. 85-16) This invention relates to thumb tacks and the like which may be pressed into a surface for securing paper, etc.

It is an object of the present invention to provide a thumb tack which will have a head designed in the proper proportion to fit between the fingers and will substantially reduce the effort in using them as was required in the use of prior art types.

Another object of the present invention is to provide a thumb tack which will have positive grip means in the surfaces of the head thus facilitating easy handling means of the thumb back when desired.

A further object of the present invention is to provide a thumb tack which will have a human engineering quality in its design so as to be universal in its application thus enabling the user to insert it into a surface or remove it from the surface while exerting a minimum of effort in doing so.

Other objects of the invention are to provide a thumb tack bearing the above objects in mind which is of simple construction, has a minimum number of parts, is inexpensive to manufacture and efiicient in operation.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in conjunction with the accompanying drawing, in which:

FIGURE 1 is a perspective view of the present invention;

FIGURE 2 is a view taken on the lines 2-2 of FIG- URE 1; and

FIGURE 3 is an enlarged vertical view of the pointed shaft shown removed from the invention.

Referring to the drawing, a thumb tack made in accordance with the present invention is shown to include an oval base 12 which tapers into a parabolic configuration on the major axis of oval 12, this body comprising the head of thumb tack 10. A pair of opposite concave surfaces 14 along the minor axis of base 12 are provided with a plurality of spaced apart and elongated grooves 16 which provide a means for providing positive gripping with the fingers, particularly when removing tack 10 from a surface. An elongated pin 18 of circular cross sectional configuration molded within the center of thumb tack 10 is provided with a pair of equally spaced apart annular recesses 20 which positively secure the pin 18 within thumb tack 10. Pin 18 is provided with a conical point 22 for easy insertion into a surface.

A person using the thumb tack 10 pinches the surfaces 14 between his fingers and urges the point 22 of pin 18 into the desired surface.

When it is necessary to remove tack 10, the operator pinches the surfaces 14 between his fingers as heretofore described and simultaneously pulls the head which will in turn release the point 22 and while doing so, the fingers will grip into the triangularly configurated grooves 16, thus providing non-slip gripping of the surfaces 14 when removing the thumb tack from the surface.

It will be noted that the pinch grip provided for by the ice concave surfaces 14 of thumb tack 10, in combination with the plurality of triangular configurated grooves 16, thus provides a maximum non-slip grip necessary for removing thumb tack 10 from a surface.

While various changes may be made in the detail construction it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claim.

What I claim as new and desire to protect by Letters Patent of the United States is:

A thumb tack comprising in combination a head made from non-metallic plastic, a substantial elongated and conically pointed metallic pin carried by said head pro viding a means for urging said tack into a surface, said head of said tack being substantially oval in configuration at its base and being substantially parabolic at the upper end of said head on the major axis of said base of said head, the side surfaces of said head being substantially concave on the minor axis of said oval base and providing pinch grip means for the fingers of a user when inserting said thumb tack or removing said tack from a surface, said surfaces of said thumb tack being recessed with a plurality of spaced apart and substantially triangularly configurated grooves extending in a direction substantially perpendicular to said pin, the angles formed by the intersections of the groove wall and the concave surface being the inwardly facing angles between the respective walls and said concave surface, said grooves providing a non-slip gripping means for the users fingers by allowing the structure of the users fingers to mold within said grooves and thus imparting a non-slipping grip for urging the said conical pointed pin of said thumb tack into a surface or removing it from a surface, said grooves of said triangular configuration in said concave surfaces sloping towards the top of said head to provide maximum holding for the fingers of the user when pinching upon the concave surfaces of said head for overcoming the hold of said pin within a surface wherein said point of pin is inserted, each of said grooves having an upper wall and a lower wall, the edge between said upper wall and concave surface forming the apex of an angle which is relatively smaller than the angle formed by said lower Wall and said concave surface, said pin being molded centrally within said head and extending through the center of said base of said head when it is molded into said head and the upper end of said pin being provided with a plurality of spaced apart and substantially angular recesses, said recesses providing a means for firmly securing the upper end of said pin within said head and said non-metallic head adhering and filling said recesses of said pin thus preventing said pin from being removed from said head when said thumb tack is being removed from a surface.

References Cited by the Examiner UNITED STATES PATENTS 317,090 5/85 Cave et a1. -28 1,325,721 12/19 Hill 8516 2,314,021 3/43 Sladky 16-121 3,009,382 11/61 Salka 8516 EDWARD C. ALLEN, Primary Examiner.

M. HENSON WOOD, IR., Examiner.

Strathy 85l6

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US312402 *21 Nov 188417 Feb 1885 Matilda fredekica steathy
US317090 *30 Dec 18845 May 1885 Lasting-tack
US1325721 *6 Jan 191923 Dec 1919 Tack or nail
US2314021 *25 Jan 194016 Mar 1943Nash Kelvinator CorpManual control device
US3009382 *16 Feb 195921 Nov 1961Ludovit SalkaThumbtack having a concave top face
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3330012 *28 Jun 196511 Jul 1967Padgett Willard LScrew-type pin retainer
US3728763 *3 May 197124 Apr 1973Warzecha JSeamstress pin
US4279190 *5 Jul 197921 Jul 1981Hummel Philip HBreak away nail
US4525115 *6 Apr 198425 Jun 1985Garner Sr Ronald STack system
US4531264 *27 Jul 198330 Jul 1985Knogo CorporationTheft detection system target fastener
US4869242 *29 Jul 198826 Sep 1989Galluzzo Mose ABone fixation pin and method of using the same
US4955813 *21 Sep 198911 Sep 1990Fochler Stephen HMulti-pronged thumbtack
US5015135 *13 Feb 199014 May 1991Chamings Antony WFlexible fastener
US5112177 *13 May 199112 May 1992Chamings Antony WFlexible fastener
US5134756 *6 Aug 19904 Aug 1992Ykk CorporationCapped shank
US5292326 *27 Feb 19928 Mar 1994United States Surgical CorporationApparatus and method for subcuticular stapling of body tissue
US5389102 *9 Oct 199214 Feb 1995United States Surgical CorporationApparatus and method for subcuticular stapling of body tissue
US5423856 *4 Aug 199313 Jun 1995United States Surgical CorporationApparatus and method for subcuticular stapling of body tissue
US5489287 *10 Feb 19946 Feb 1996United States Surgical CorporationApparatus and method for subcuticular stapling of body tissue
US5573541 *3 Feb 199512 Nov 1996United States Surgical CorporationApparatus and method for subcuticular stapling of body tissue
US619678218 Nov 19996 Mar 2001Plush Pins, LlcPush pin
US6520704 *25 Jan 200118 Feb 2003Hanover Direct, Inc.System for mounting an object to a support
US6681469 *6 Feb 200227 Jan 2004Hanover Accessories, Inc.Decorative elements for pumpkins or other pierceable objects
US8317445 *28 Apr 201027 Nov 2012Fredrick Arlen ReederButterfly push-pull pin
US916251722 Jul 201120 Oct 2015Albert CecchiniSafety tack
US20020108231 *6 Feb 200215 Aug 2002Hanover Accessories, Inc.Decorative elements for pumpkins or other pierceable objects
US20110121142 *24 Jun 200926 May 2011Under The Roof Decorating Inc.Item hanging hardware
US20110268535 *28 Apr 20103 Nov 2011Fredrick Arlen ReederButterfly Push-Pull Pin
US20130062484 *14 Sep 201114 Mar 2013CTZ Global, LLCReusable hanger that inserts and removes from a mounting surface without tools
DE19652053A1 *13 Dec 19962 Apr 1998Daimler Benz AgAutomotive air inlet flap control rod
U.S. Classification411/498, 411/923, 24/711.4, 411/473
International ClassificationF16B15/02
Cooperative ClassificationF16B15/02, Y10S411/923
European ClassificationF16B15/02