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Publication numberUS2453742 A
Publication typeGrant
Publication dateNov 16, 1948
Filing dateMar 23, 1945
Priority dateMar 23, 1945
Publication numberUS 2453742 A, US 2453742A, US-A-2453742, US2453742 A, US2453742A
InventorsBowen Henry B, Vineberg Arthur M
Original AssigneeBowen Henry B, Vineberg Arthur M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Terminal attachment for crutches and the like
US 2453742 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Patented Nov. 16, 1948 TERMINAL ATTACHMENT FOB CRUTCHES AND THE LIKE Henry B. Bowen and Arthur M. Vineberg,

Montreal, Quebec, Canada 1945, Serial No. 584,462

" Application March 23 1 Claim.

This invention relates to ground-engaging terminal attachments for crutches, canes, ladders and the like and the object is to provide a termi-- nal attachment which gives exceptionally wide bearing area and is adapted to make fiat contact with the ground irrespective of the relative angular position of the crutch or other article to which it is applied.

More particularly, the invention comprises a ferrule connected to the central portion of a relatively large plate provided with a plurality of widely spaced ground-engaging lugs or feet depending from portions of the plate projecting a substantial distance laterally beyond the ferrule. The ferrule and plate are connected together by means permitting relative angular motion thereof so that the ground-engaging lugs of the plate will bear squarely on the ground when the crutch or other article to which the ferrule is applied is in a slanting position with reference to the ground.

Proceeding now to a more detailed description reference will be had to the accompanying drawings, wherein:

Fig. 1 is a plan view of one embodiment of our invention applied to a crutch which is shown in section.

Fig. 2 is a side elevational view, partly in section, of the assembly shown in Fig. 1.

Fig. 3 is a View similar to Fig. l but showing a slightly modified assembly.

Fig. 4 is a, side elevational view, partly in section, of the modified assembly shown in Fig. 3.

In the assembly shown in Figs. 1 and 2, 5 desi nates a ferrule fitted on the lower end of a crutch stick 6. The lower end of ferrule 5 is formed to provide a downwardly facing shoulder I surrounding an internally threaded neck extension 8 into which is screwed the shank 9 of a ball member Iii forming part of a ball and socket connection II provided between the ferrule and the central portion of a triangular plate I2. The corner portions of plate I2 project a substantial distance laterally beyond the ferrule and are provided with depending ground-engaging lugs I3 which may be of solid or hollow construction and may be formed integral with said plate or riveted or otherwise secured thereto. The plate I2 is provided with a central opening I4 through which shank 9 of ball I is passed'upwardly for screw threaded engagement with the neck 8 of ferrule 5. The wall of opening I4 is spherically curved to provide a ball seat against which the ball is held by a retaining plug I provided with a spherically curved ball-engaging seat I6. The plug I5 is screwed into a threaded socket I'I formed integral with the underside of plate I I. I

A coil spring I8 is interposed between ferrule 5 and plate I2 so that the upper end of the spring bears against shoulder I while the lower end of the spring is seated in a recess I9 provided in the upper surface of plate I2. As indicated by dotted lines in Fig. 2 each of the depending groundengaging lugs 13 of plate I2 may have a cushion-- ing cup 20 of rubber or similar cushioning material fitted thereon.

Spring I8 normally tends to maintain ferrule 5 perpendicular to the plane of the upper surface of plate I2 but is yieldable to permit the relative angular motion between the plate and the ferrule which is provided for by the ball and socket connection between these parts. As previously stated, the ball and socket connection permits the ground-engaging lugs of the plate to make and maintain fiat contact with the ground when the ferrule and the article to which it is attached are inclined with reference to the ground as indicated by dotted lines in Fig. 2.

The assembly shown in Figs. 3 and 4 is substantially the same as that previously described except that the spring I8 is replaced by a rubber ring 22 provided with a lower portion 23 of reduced diameter which is fitted in the recess I9 of plate I2. The rubber ring serves the same purpose as the previously mentioned spring I8.

In some cases, particularly where the attachment is applied to a ladder, the cushioning cups 20 shown in Fig. 2 may be omitted and the lugs provided, as indicated by dotted lines in Fig, 4, with conical points or spikes 25 adapted to dig into the ground.

An important feature of the invention resides in the fact that the pressure transmitted to plate I2 through the ball and socket connection has no tendency to overturn said plate even when the ferrule 5 is at the maximum permissible angle of inclination with respect to said plate. In this connection it will be noted that the lowest point of engagement between the ball I0 and its socket is located a substantial distance below the lowest surface of the plate.

Having thus described our invention it will be understood that various modifications may be resorted to Within the scope and spirit of the invention as defined by the appended claim. For example, the ferrule 5 and plate I2 may be connected together by any suitable means that will permit of the necessary relative angular motion thereof and the plate l2, instead of being triangular, may be of any other desired shape, the

principal consideration being that the groundengaging lugs of the plate are Widely spaced and formed integral with or attached to portions of the plate which project a substantial distance laterally beyond the ferrule. It will also be understood that the lugs l3 depending from plate I2 may vary in number or shape and may be formed integral with Or attached to the plate in any desired manner.

We claim:

A terminal attachment of the character de-- scribed, comprising a plate provided with acentral vertical opening having its defining wall spherically curved to provide a ball seat, a socketforming wall extending downwardly from a portion of the plate encircling said opening, groundengaging members extending downwardly from portions of the plate located outwardly of said wall, a ball member fitted against said ball seat so that the major portion of the ball member is disposed below the upper surface of the plate with a substantial portion of the ball member lying below the bottom surface of the plate and within the socket formed by said wall, a ball-retaining plug removably secured in said socket and provided with an upwardly facing, spherically curved seat engaging the portion of the ball disposed within said socket, a ferrule havin its lower end secured to a part of the ball projecting above said plate and resilient biasing means arranged to act against said plate and said ferrule.


REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 332,684 Tuttle Dec. 15, 1885 765,984 Morris July 26, 1904 1,672g596 Zerk June- 5, 1946

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US332684 *Aug 17, 1885Dec 15, 1885 Crutch
US765984 *Feb 24, 1899Jul 26, 1904John W MorrisFoot for crutches or canes.
US1672596 *Sep 9, 1925Jun 5, 1928Zerk Oscar UTripod
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2635904 *Oct 11, 1949Apr 21, 1953Stanley WorksRope attaching means
US3163437 *Sep 28, 1962Dec 29, 1964William Phillipson PhillipSki pole baskets
US3168014 *Sep 11, 1962Feb 2, 1965Alkon Products CorpMounting arrangement for hydraulic piston and cylinder
US3199886 *Nov 14, 1963Aug 10, 1965Dynacone IncSki pole
US4135536 *Aug 18, 1977Jan 23, 1979Willis Wilburn CTip members for crutches and the like
US4141375 *Feb 3, 1978Feb 27, 1979Tykwinski Leonard MKnee crutch-cane
US4203683 *Apr 7, 1978May 20, 1980Cam Gears LimitedBall joints
US5103849 *Dec 17, 1990Apr 14, 1992Hamner Lewis NHiker's staff with point
US5113887 *Jul 27, 1989May 19, 1992Herman Jr Harry HMobility assisting devices
US5193567 *Oct 29, 1991Mar 16, 1993Razny Jr Frank RMobility enhancement device
US5217033 *Apr 14, 1992Jun 8, 1993Herman Jr Harry HMobility assisting device
US5344250 *Sep 24, 1992Sep 6, 1994Actmedia, Inc.Advertising display mounting device
US5472289 *Aug 19, 1994Dec 5, 1995Actmedia, Inc.Advertising display mounting device
US5640986 *Jun 29, 1994Jun 24, 1997Herman; Harry H.Mobility assisting device
US5653547 *Sep 28, 1995Aug 5, 1997Thk Co., Ltd.Spherical joint with an elastic cap
US6394117 *Sep 23, 1999May 28, 2002Bodyworks Properties LimitedPlug for connecting to a walker
US7581556Dec 13, 2006Sep 1, 2009University Of MarylandCrutch-like mobility assist device with rotatable footer assembly
US8166990Jul 2, 2008May 1, 2012Core Consulting, LlcCrutch assembly
US8176927Mar 9, 2010May 15, 2012King-Chang WuWalking stick with all-rounded support
US8596288Apr 26, 2012Dec 3, 2013Core Consulting, LlcCrutch assembly
US8778031 *Sep 21, 2011Jul 15, 2014Clemson UniversityLimb prosthesis
US9084458 *Apr 8, 2013Jul 21, 2015Hurrycane LlcWalking aid including a bendable puck coupled between a foot and handle
US9226556 *Nov 6, 2014Jan 5, 2016Li-Sheng ChienFoot base for assistive device
US9326572Nov 27, 2013May 3, 2016Core Consulting, LlcCrutch assembly
US9386830Oct 2, 2014Jul 12, 2016Hurryworks LlcWalking aid device
US9456671Jun 15, 2015Oct 4, 2016Hurryworks LlcWalking aid including bendable puck coupled between a foot and handle
US20070144568 *Dec 13, 2006Jun 28, 2007University Of MarylandCrutch-like mobility assist device with rotatable footer assembly
US20100313925 *Jun 16, 2009Dec 16, 2010Jin Shan JiangBase structure for a walking stick
US20110005559 *Jul 2, 2008Jan 13, 2011Jesse DailyCrutch Assembly
US20110094552 *Mar 9, 2010Apr 28, 2011King-Chang WuWalking Stick With All-Rounded Support
US20140299168 *Apr 8, 2013Oct 9, 2014martFIVE LLCWalking aid including a bendable puck coupled between a foot and handle
USD752854Jan 16, 2014Apr 5, 2016Juvo Products LlcStanding cane tip elements
USD754963Mar 20, 2014May 3, 2016Alltech Design LlcBase for a cane
DE1295300B *Dec 16, 1964May 14, 1969Bofors AbSteuergeraet mit zwei Freiheitsgraden mit einem in einem Universalgelenk gelagerten Steuerhebel
EP0824200A1 *Jul 15, 1997Feb 18, 1998Minebea Co.,Ltd.Stud having a spherical surface bearing
EP1097691A1 *Nov 5, 1999May 9, 2001Jacqueline Ann RobinsWalking aid device
U.S. Classification135/77, 403/220, 403/132, 403/166
International ClassificationA61H3/02, A61H3/00, F16C11/06
Cooperative ClassificationA61H3/0288, F16C11/0647, A61H2003/0272, A61H2003/0294
European ClassificationF16C11/06C3F, A61H3/02T