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Publication numberUS3675885 A
Publication typeGrant
Publication dateJul 11, 1972
Filing dateAug 20, 1970
Priority dateAug 20, 1970
Publication numberUS 3675885 A, US 3675885A, US-A-3675885, US3675885 A, US3675885A
InventorsShute Adrian L
Original AssigneeShute Adrian L
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Spring-loaded folding arm
US 3675885 A
Abstract
A spring-loaded folding arm comprising two pivotally connected leg portions, with a spring having one end connected to each leg and arranged to urge the arm into the extended position. In a particular application, shown and described, the arms are employed between a stationary structure and a movable structure to provide a substantially counterbalanced extensible mechanism.
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Description  (OCR text may contain errors)

United States Patent Shute 1 July 11,1972

[54] SPRING-LOADED FOLDING ARM [21] Appl. No.: 65,643

[52] U.S. Cl ..248/35l, 296/23, 296/29 Bintz ..248/166 X 2,565,695 8/ 1951 Lynn ..248/240.4 3,000,683 9/1961 MacNeary ..248/439 X 1,424,222 8/1922 Tuttle ....296/23 A 1,216,986 2/1917 l-labig ..296/23 A Primary Examiner-William H. Schultz Attomey-Herbert E. Haynes, J r

[51] lnt.Cl ..F16m 13/00 [57] ABS CT 58 Field ofSearch .248/166, 188.2, 240.4, 292. A Spring-loaded folding arm comprising two Pivotally 243/35 355 421 429; 29 27 23 10 29; nected leg portions, with a spring having one end connected to 52/66 each leg and arranged to urge the arm into the extended position. In a particular application, shown and described, the [56] References Cited arms are employed between a stationary structure and a movable structure to provide a substantially counterbalanced UNITED STATES PATENTS extensible mechanism.

3,403,936 10/1968 Young ..296/27 ZCIainBADraWing Figures I O I 1 1 28 PM'ENTEDJUL 11 1912 3.675.885

sum 1 or 2 b INVENTOR.

ADRIAN L SHUTE AGENT PATENTEDJUL H 1972 3. 675 885 SHEET 2 OF 2 INVENTOR.

ADRIAN L. SHUTE AGENT WX/W/ SPRING-LOADED FOLDING ARM BACKGROUND OF THE INVENTION This invention relates to mechanical devices and more particularly to a spring-loaded folding arm having a particular application in the art of extensible structures.

1 Field of the Invention The extension and retraction of relatively large objects has long presented a challenge in the field of mechanical design and many elaborate systems have been developed to solve particular problems.

Complexity and cost of these elaborate systems have contributed materially to their limited commercial acceptance. Therefore, it would be highly desirable to provide a simple low cost extending device for use with extensible structures.

2. Prior Art Heretofore, the retraction and extension of relatively large structures have required elaborate extending devices such as screw jacks, chain-pulley combinations, gear-rack mechanisms and the like. Devices of this nature have varied in complexity and cost, dependent on the size and weight of the extensible object and the amount of automatic operation desired. Therefore, many devices have been developed ranging from crank operated mechanisms to fully power assisted devices.

SUMMARY OF THE INVENTION The spring-loaded arm of the present invention, as described and claimed, comprises a base leg in the form of a bifurcated member, with an extending leg pivotally mounted between the tines at the open end thereof. A spring is provided for urging the arm into the extended position and has one end attached to the closed end of the bifurcated member, and the other end attached intermediate the ends of the extending leg so that the spring is positioned to one side of the pivot point. The extending leg is provided with a protruding portion which extends beyond the pivot point into the bifurcated member. The protruding portion of the extending leg is provided with a laterally extending stop plate positioned on the same side of the pivot point as the spring, thus the spring urges the plate into engagement with the tines when the arm is in .the extendedposition. Folding of the arm may be accomplished only selecting the spring force approximately equal to the weight of the lid will provide a substantially counterbalanced opening mechanism which may be easily operated in either direction by manually upsetting the balance.

Mounting a plurality of folding arms of the present invention in spaced relationship around the periphery of the base of an object to be extended, and properly selecting the spring sizes, results in the same counterbalanced operation heretofore described in relation to the aforesaid lid-like structure.

It is therefore one object of the present invention to provide a spring-loaded folding arm which is simple to fabricate and inexpensive to manufacture.

Another object of the present invention is to provide a spring-loaded folding arm which is biased in the extended position.

A further object of the present invention is to provide a spring-loaded folding arm in which the spring is easily replaceable to change the force required to fold the arm.

A still further object of the present invention is to provide a spring-loaded folding arm which when mounted to an extensible structure provides a substantially counterbalanced extending device.

The foregoing and other objects of this invention, as well as the invention itself, may be more fully understood from the following description when read in conjunction with the accompanying drawings.

BRIEF DESCRIPTION or THE DRAWINGS FIG. 1 is a perspective view schematically illustrating the spring-loaded folding arm of the present invention in operation on an extensible camper cover.

I FIG. 2 is a perspective view of the spring-loaded folding arm of the present invention.

FIG. 3 is a fragmentary sectional view taken on the line 3- 3 of FIG. 2.

FIG. 4 is a side view of the folding arm of the present invention, showing the arm in the folded position.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring more particularly to the drawings, FIG. 1 illustrates a truck-bed 10 having a camper cover 11 mounted thereon by a plurality of spring-loaded folding arms 12 of the present invention.

The folding arm 12, as best seen in FIGS. 2, 3 and 4 comprises a bifurcated base leg 13 with upstanding tines 14 which are suitably connected at their lower ends by an interposer member 15. Extending outwardly from opposite sides of the base leg 13, are mounting flanges 16, pivotally mounted by a pivot pin 17. The tines 14 of base leg 13 are provided at their upper ends with a pivot pin 18 which pivotally attaches an extending leg 19 between the tines l4. Extending leg 19 is provided with a lower portion 20 depending downwardly between tines I4. Suitably attached to lower portion of the leg 19 isa transverse stop plate 21 positioned to laterally extend beyond both sides 22 of the lower portion 20 of leg 19 to limit travel thereof, as will be hereinafter described in detail. An upper portion 23 of extending leg 19 is provided with pivotally attached mounting flanges 24 positioned in the outermost ends of leg 19.

A spring 25 is provided to urge the am 13 into the extended position as best seen in FIG. 2. The lower end of spring 25 is suitably attached in the area of interposer 15; with the upper end being attached intermediate the ends of extending leg 19 by a hook 26 with intermediate portion 27 of the spring 25 in abutting contact with the outwardly facing surface of stop plate 21.

As seen in FIG. 4, the lower end 20 of extending arm 19 is formed with an arcuate surface 28 to prevent spring distortion when the arm is in the folded position.

To provide a smooth, endurable, easily operated structure, each of the pivot pins are suitably journaled on bushings.

OPERATION Folding the arm 13 from the extended position as shownin FIG. 2 may be accomplished by exerting a force in the direction of arrow 29 in the general area of pivotal movement. The completion of the folding action may then be easily accomplished by the weight of the extensible object, with possibly a slight pushing force if the weight is insufficient to overcome tension of the spring 25.

Mounting arms 13 of the present invention in opposite cornets of a rectangular object such as the camper cover 11, shown in FIG. 1, results in an easily extensible structure. To raise the cover. 11, the operator need only release the locking mechanisms 30 suitably mounted on both sides of the cover, then simply lift one side of the cover to the position shown in solid lines. This action extends the two arms on that side and similar action on the other side will completely raise the cover to the position shown in broken lines. If it is desired to lock the arms in the extended position, a locking pin 31 may be inserted through holes 32 as seen in FIGS. 2 and 3.

Longitudinal stabilization of the extended structure for driving purposes may be provided by stabilizer bars 33. Each bar 33 comprises a strut portion 34, having an upper tab 35 to provide means for attaching the bar to pivot pin 18. The lower end of each bar 33 is provided with a lower tab 36 which is mounted to truck bed 10 by bolt 37 carried in angle bracket 38. As seen in FIG. 1 an axis 39 illustrates the coaxial relationship between pivot pin 17 and stabilizer bar mounting bolt 37.

This co-axial relationship allows bars 33 to pivot about bolts 37 when the arms 12 are folded. I

A modified extensible structure may be provided by mounting one or more folding arms of the present invention to the opening side of an access lid, having a suitable hinge on the opposite side thereof. Operation of this type of mechanism may be accomplished in the same manner as the first step hereinbefore described in relation to the camper cover.

Various changes in the device herein chosen for purposes of illustration in the drawing will readily occur to persons skilled in the art having regard for the disclosure hereof. To the extent that such modifications and variations do not depart from the spirit of the invention, they are intended to be included within the scope thereof which is not limited to the device specifically illustrated but rather by a fair interpretation of the following claims.

I claim:

1. A spring-loaded folding arm for use between a stationary structure and an extensible structure comprising:

a. a bifurcated base leg;

' b. an extending leg pivotably mounted between the outermost ends of said bifurcated base leg, said extending leg having a lower portion protruding downwardly into said bifurcated base leg;

c. stop means mounted to the lower portion of said extending leg for limiting pivotal movement of said extending leg;

d. a tension spring connected at one end thereof to the lower portion of said bifurcated base leg, and having the other end attached intermediate the ends of said extending leg, said tension spring having its intermediate portion laterally adjacent to the pivot point of said base leg and said extending leg; and

e. mounting means pivotably mounted to opposite ends of the arm for attaching the arm between the stationary structure and the extensible structure. v

2. A spring-loaded folding arm as claimed in claim 1 wherein said extending leg has an arcuate surface formed on the bottom portion thereof for preventing distortion of said tension spring when the arm is in the folded position.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1216986 *Jun 15, 1916Feb 20, 1917Edward H HabigTrailer-camp.
US1424222 *Nov 10, 1921Aug 1, 1922Earl TuttleFolding tent bed for automobiles
US2565695 *Aug 10, 1946Aug 28, 1951Lynn George AAdjustable safety seat
US2650052 *Feb 20, 1951Aug 25, 1953Bintz Louis AFishing stand
US3000683 *Oct 30, 1958Sep 19, 1961Rose C MacnearyCombined portable typewriter and table with carrying case and stool
US3403936 *Jan 16, 1967Oct 1, 1968Charles H. YoungCollapsible and extendable standard
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3810273 *May 30, 1972May 14, 1974Shute ALocking mechanism
US4077662 *Apr 1, 1975Mar 7, 1978Kauffman Clarence BExpansible camper
US4201413 *Jul 7, 1978May 6, 1980Rowe David ELift apparatus for camper top
US4469364 *Sep 27, 1982Sep 4, 1984Rafi Zadeh HassanTool box for covered pickup trucks
US4613181 *Nov 25, 1985Sep 23, 1986Rafi Zadeh HassanCover assembly for pickup truck bed
US4673209 *Sep 15, 1986Jun 16, 1987Rafi Zadeh HassanCover assembly for pickup truck bed
US4832359 *Aug 21, 1987May 23, 1989Rafi Zadeh HassanExtensible cover for the bed of a pick-up truck having a 5th wheel trailer hitch
US4856841 *Oct 20, 1988Aug 15, 1989Rafi Zadeh HassanAdjustable folding arm for vehicle cover
US5002329 *Aug 16, 1989Mar 26, 1991Rafi Zadeh HassanCover assembly and tent for truck bed
US5704681 *Dec 23, 1996Jan 6, 1998Magic-Cap (U.S.A.) Inc.Side access truck cap
US6149220 *Aug 7, 1997Nov 21, 2000Custom Creative Products, Inc.Cover assembly for the cargo area of a vehicle
US6203097Jun 14, 2000Mar 20, 2001Fleetwood Folding Trailers, Inc.Folding trailer with bed support mechanism operated from a standing position
US6209944Oct 15, 1997Apr 3, 2001Charles R. BilliuStowable truck bed enclosure
US6308467 *May 4, 1999Oct 30, 2001Joseph Francis TimiltyWall positioning and bracing apparatus and method
US6749252 *Dec 6, 2002Jun 15, 2004Dac Sky, LlcFold-out camper for a pick-up truck
US6896313 *Sep 16, 2004May 24, 2005Daimlerchrysler CorporationConvertible cover arrangement for vehicle cargo area
US7207614Dec 7, 2004Apr 24, 2007Cedric Herbert BriggsConvertible cap/cover assembly for a pick-up truck
US7654603 *Apr 18, 2008Feb 2, 2010Jerry KealyRaisable truck box cover
US7942464Aug 20, 2008May 17, 2011Kenneth H. SchmidtTonneau style pop-up camper for pickup trucks
US8007024 *Jan 29, 2010Aug 30, 2011Jerry KealyRaisable truck bed cover
Classifications
U.S. Classification248/351, 296/176, 296/29, 296/100.8, 296/165
International ClassificationB60P3/34, B60P3/32
Cooperative ClassificationB60P3/34
European ClassificationB60P3/34
Legal Events
DateCodeEventDescription
Nov 12, 1985AS02Assignment of assignor's interest
Owner name: SHUTE, KATHLEEN M., BENEFICIARY OF THE ESTATE OF A
Effective date: 19851106
Owner name: SHUTE, KATHLEEN M., INDIVIDUALLY
Nov 12, 1985ASAssignment
Owner name: SHUTE, KATHLEEN M., INDIVIDUALLY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. (AFFIDAVIT ATTACHED);ASSIGNOR:SHUTE, KATHLEEN M., BENEFICIARY OF THE ESTATE OF ADRIAN L., SHUTE, DECEASED;REEL/FRAME:004477/0844
Effective date: 19851106
Oct 7, 1985AS08Conditional assignment
Free format text: DESERT COLORS, INC., A CORP OF ARIZONA; BISBEE ASSOCIATES, INC., 2541 EAST WASHI * BISBEE ASSOCIATES, INC. : 19780306; DESERT COLORS, INC. : 19780306
Oct 7, 1985ASAssignment
Owner name: BISBEE ASSOCIATES, INC., 2541 EAST WASHINGTON, PHO
Owner name: DESERT COLORS, INC., 2541 EAST WASHINGTON, PHOENIX
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BISBEE ASSOCIATES, INC.;REEL/FRAME:004474/0194
Effective date: 19771123
Owner name: DESERT COLORS, INC., A CORP OF ARIZONA
Free format text: CONDITIONAL ASSIGNMENT;ASSIGNORS:BISBEE ASSOCIATES, INC.;DESERT COLORS, INC.;REEL/FRAME:004474/0184
Effective date: 19780306
Oct 7, 1985AS02Assignment of assignor's interest
Owner name: BISBEE ASSOCIATES, INC.
Owner name: DESERT COLORS, INC., 2541 EAST WASHINGTON, PHOENIX
Effective date: 19771123
Aug 13, 1985ASAssignment
Owner name: SHUTE, KATHLEEN MARIAN S., EXECUTRIX OF THE ESTATE
Free format text: LETTERS OF TESTAMENTARY;ASSIGNOR:SHUTE, ADRIAN LEROY;REEL/FRAME:004448/0886
Aug 13, 1985AS05Letters testamentary
Free format text: SHUTE, KATHLEEN MARIAN S., EXECUTRIX OF THE ESTATE OF ADRIAN L. SHUTE, DEC[D. * SHUTE, ADRIAN LEROY: