US2868274A

US2868274A - Combination back-rests and bag structures

Info

Publication number: US2868274A
Application number: US603292A
Authority: US
Inventors: Charles J Miller
Original assignee: CHARLES JUSTIN MILLER
Current assignee: CHARLES JUSTIN MILLER
Priority date: 1956-08-10
Filing date: 1956-08-10
Publication date: 1959-01-13
Anticipated expiration: 1976-01-13

Description

Jan. 13, 1959 c, J MILLER 2,868,274

COMBINATION BACK-RESTS AND BAG STRUCTURES Filed Aug. 10, 1956 2 Sheets-Sheet 1 INVENTOR.

BY Maw W FZH '5- [HF/A1155 LJ. MLLER Jan. 13, 1959 c. J. MILLER 2,863,274

COMBINATION BACK-RESTS AND BAG STRUCTURES Filed Aug. 10, 1956 2 Sheets-Sheet 2 INVENTOR. EHFIRLEIE/ Ll M/LLER BY COMBINATION BACK-RESTS AND BAG STRUCTURES Charles J. Miller, Chicago, Ill., assignor to Charles Justin Miller, Chicago, Ill.

Application August 10, 1956, Serial No. 603,292

10 Claims. (Cl. 155-154) This invention relates to combination back-rests and bag structures and, more specifically, to combination backrests and bag structures which are particularly well adapted for use at the beach, on picnics, and the like.

It is a primary object of my invention to provide a ranged in such a manner relative to the back-rest that atent the bag, when disposed in one position, affords a practical, effective carrying case for the back-rest and for other items such as, for example, swimming suits, towels, lunches, and the like, and, when disposed in another position affords an effective seat portion disposed in occupantreceiving position forwardly of the back-rest.

A further object of my invention is to afford a novel combination back-rest and bag which may be quickly andeasily changed back and forth between the two aforementioned positions.

Combination back-rests and carrying cases have been heretofore known in the art but have had several inherent disadvantages such as, for example, being complicated in construction and operation; being relatively diflicult and expensive to manufacture; not affording a practical, reliable carrying case for the back-rest or for other items, or the like. It is anotheg important object of my invention to overcome these disadvantages and to afford a novel and improved combination back-rest and carrying case therefor.

Yet another object of my invention is to afford a novel combination baclorest and bag structure which, when disposed in seat-affording position affords a novel backrest which is firmly supported.

A further object of my invention is to enable a novel back-rest to embody a head-rest constituted and arranged thereon in a novel and expeditious manner.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which,

by way of illustration, show a preferred embodiment of the present invention and the principles thereof and what I now consider to be the best mode in which I have contemplated applying these principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

Fig. l is a perspective view of a combination back-rest and bag embodying the principles of my invention, showing the back-rest disposed in the bag in carrying position;

Fig. 2 is a perspective view of the back-rest and bag shown in Fig. 1, but showing the back-rest and bag disposed in a seat-formingposition;

Fig. 3 is a longitudinal sectional view taken substantially along the line 3-3 in Fig. 2;

Fig. 4 is a rear elevational view of the combination back-rest and bag shown in Fig. 2 but with the parts thereof disposed in different position;

Fig. 5 is a detail sectional view taken substantially along the line 5-5 in Fig. 4;

Fig. 6 is a detail sectional view taken substantially along the line 66 in Fig. 4;

Fig. 7 is a perspective view similar to Fig. 2 but showing a modified form of my invention;

Fig. 8 is a detail sectional view taken substantially along the line 88 in Fig. 7;

Fig. 9 is a detail sectional view taken substantially along the line 9--9 in Fig. 8; and

Fig. 10 is an enlarged detail sectional view of a portion of the back-rest shown in Fig. 9. i

To illustrate the preferred embodiment of my invention, a combination back-rest and bagZtl, embodying the principles of my invention is shown in Figs. 1 to 6, inclusive, of the drawings.

in general, the combination back-rest and bag embodies a back-rest 22 having a bag 24 connected thereto by suitable means such as a strap 26. The back-rest 22 may be mounted in the bag 24 in carrying position, Fig. 1, in which position the bag 24 affords an effective carrying case therefor. The back-rest 22 and the bag 24 may also be disposed in an occupant-receiving position, as shown in Fig. 2, wherein the bag 24 may be disposed flat on the ground, or the like, in seat-forming position and the back-rest 22 may project upwardly and rearwardly therefrom to afford a back-supporting portion for a person sitting on the seat formed by the bag 24.

The back-rest 22 includes a back-supporting unit 28 which includes two substantially straight elongated side rails Ell and 31 having a cross bar 32 attached to, and extending between, the lower ends thereof, Figs. 2 and 3. The side rails 34 and 31 and the cross bar 32 may be made of any suitable material such as, for example, angle iron. A cross brace or cross bar 33 is mounted between the upper end portions of the side rails and 31, in spaced relation to the upper ends thereof, Figs. 4 and 6, and are attached thereto by suitable means such as

screws

35 and 36 which extend through the

side rails

30 and 31, respectively, into the adjacent ends of the cross brace 33.

A panel 38 made of any suitable material such as, for exampie, sheet steel or the like, is mounted on and extends between the upper end portions of the side rails 35? and 31 and is secured thereto by the

screws

35 and 36 extending through rearwardly projecting flanges 33a and 33b on the panel 38 into the cross brace 33, and other bolts or screws 39 extending through the

flanges

38a and 38b and the side rails Eil and 31, respectively, Figs. 4 and 6.

A head resl; 41, which includes an elongated panel 43, is pivo-tally mounted on the back-supporting member 28 in position wherein it may be moved between a collapsed position, shown in Fig. 4 wherein it is disposed "in downwardly extending substantially parallel relation to the back-supporting member 28;, and an erected position, as shown in Fig. 3, wherein the panel 43 projects upwardly above the back-supporting member 248 in substantially longitudinal alignment therewith. The panel 453 may be made of any suitable material such as, for example, sheet steel and embodies two forwardly projecting flanges 43a and 43b extending along the opposite longitudinal edge portions thereof, Figs. 3 and 6. The crossbar 33 extends through one end portion ,OfLfiZlCiIOf the flanges 43a and 43b to thereby .pivotally support .the panel 43 on the crossbar 33. The panel 43 is disposed and two

spacer sleeves

45 and 46 are mounted on the cross bar 33 between the flanges 43a and 43b and the flanges 38a and 38)), respectively, to thereby retain the 'panel 43 in the aforementioned centrally disposed position on the cross bar 33.

A substantially U-shaped brace 48 having two

parallel side legs

50 and 51 and an intermediate leg 52 extending between the lower end portions of the side legs and 51, Figs. 2, and 3, is mounted in depending relation to the cross bar 33, with the cross bar 33 extending through the upper end portions of the

legs

56 and 51, Figs. 3 and 6. The

legs

58 and 51 are disposed on the cross bar 33 outwardly of the

spacing sleeves

45 and 46, between the

spacing sleeves

45 and 46 and the

side rails

30 and 31, respectively.

Another substantially U-shaped brace 54, having two substantially

parallel side legs

56 and 57 and an inter mediate leg 58 extending between the lower end portions thereof, is also pivotally mounted on the cross bar 33 in depending relation thereto. The cross bar 33 extends through the upper end portions of the

side legs

56 and 57, which are disposed between the leg 50 and the spacing sleeve 45, and the leg 51 and the spacing sleeve 46, respectively, Fig. 6. The

side legs

56 and 57 of the brace 54 are considerably shorter in length than the

side legs

50 and 51 of the brace 48 for a purpose which will be discussed in greater detail presently.

A substantially V-shaped brace 60, having two

side legs

62 and 63 and an intermediate leg 64 extending between the lower end portions thereof, is pivotally mounted on suitable brackets 66 and 67 mounted on the rear faces of the

side legs

50 and 51, respectively, of the brace 48 below the cross bar 33, Figs. 3, 4 and 6. The

legs

62 and 63 of the brace 66 diverge outwardly away from each other from the intermediate leg 64 toward the braces 66 and 67, and have outwardly projecting

end portions

62a and 63a which are journalled in the brackets 66 and 67. The

side legs

62 and 63 of the brace 6tl-are of such length that when the brace 68 is disposed in depending relation to the brackets 66 and 67, and the panel 43 is disposed in depending relation to the cross bar 33, the lower end portion of the panel 43 projects downwardly behind the intermediate leg 64, and the end rail 32 of the back-supporting member 28 is disposed forwardly of the intermediate leg 64 in parallel relation thereto.

A series of notches 69 are formed in the flanges 43a and 43b on the head-rest panel 43, with each of the notches 69 in the flange 43a disposed in horizontal align ment with a corresponding notch 69 in the flange 435, so that the intermediate leg 64 of the brace 66 may be disposed in oppositely disposed pairs of the notches 69 to thereby support the back-rest panel 43 in upwardly projecting position when the back-rest 22 is disposed in erected position, as will be discussed in greater detail presently. I

The bag 24 is preferably made of two substantially

square sheets

71 and 72 of suitable flexible material such as, for example, water-repellent canvas duck disposed in juxtaposition to each other, Figs. 2 and 5, and secured together along three

side edges

74, 75 and 76 by suitable means such as stitching 78. The other edge 77 of the juxtaposed

sheets

71 and 72, disposed in parallel relation to the edge 75, are left unsecured to thereby afford an open top for the bag 24. The edge portion 75, which affords the bottom of the bag 24, is looped to the cross bar 32 of the back-supporting member 28 by an elongated strap 79 made of suitable flexible material such as, for example, the aforementioned canvas duck. The strap 79 extends longitudinally along the cross bar 32 and is folded therearound, the free longitudinal edges of the strap being secured to the bottom edge 75 of the bag 24 by suitable means such as the stitches 78 along the edge portion 75. The strap 79 is preferably of such length that it extends along most of the cross bar 32 between the side rails 4 30 and 31 but terminates in spaced relation to both of the

side rails

30 and 31, Fig. 2. V

Substantially U-shaped

handle straps

81 and 82 may be secured to the edge portions 77 of the

sheets

71 and 72, respectively, to afford convenient carrying handles for the bag 24 when the bag 24 and the back-rest 22 are disposed in carrying position as will be discussed in greater detail presently.

The

sheets

71 and 72 are preferably of such size that the distance between the seams 78 at the edge portions 74 and '76 is somewhat greater than the width of the backrest 22, and the distance between the edge 77 and the seam 73 at the edge 75 is somewhat greater than the length of the back-rest 22. a

With this construction, the back-rest 22 may be disposed in collapsed or inside-out position, as shown in'Fig. 4, wherein the

braces

48 and 54 and the panel 43 are disposed in depending relation to the cross bar 33, and the brace 60 is disposed in depending relation to the brackets 66 and 67, with the intermediate leg 64 disposed between the lower end portion of the panel 43 and the cross bar 32. When the parts of the back-rest 22 are disposed in these positions, they are all substantially uniplanar to the back-supporting member 28, to afford a compact assembly. With the parts of the back-rest 22 disposed in this position, the bag 24 may be disposed in what will be herein referred to as its right-side-out position, wherein the

sheets

71 and 72 extend upwardly from the cross bar 32 in substantially parallel relation to each other and on opposite sides of the back-rest 22 in such position that the upper edges 77 of the

sheets

71 and 72 afford an open upper end portion of the bag 24, and the back-rest 22 is disposed within the bag 24. The handle straps 81 and 82 project outwardly from the upper edge 77 of the bag 24 to thereby afford convenient handles by which the bag 24 and the back-rest 22 contained therein may be carried.

The

sheets

71 and 72 are preferably chosen of such size that they fit somewhat loosely around the back-rest 22 when disposed in the carrying position shown in Fig. 1 so that other articles such as, for example, swimming suits, beach towels, picnic lunches, and the like, maybe carried in the bag 20 together with the back-rest 22. For example, I have found that with the back-rest 22 of such size that the length thereof is approximately 15 inches, the widththereof is approximately 11 inches and the thickness thereof, at the widest part, when the back-rest 22 is disposed in collapsed position, is approximately one inch, if the

sheets

71 and 72 are chosen of such size that the distance between the seams 78 along the edges 74- and 76 is approximately 16 inches, and the distance between the edge 77 and the seam 78 along the edge 75 is, also, approximately 16 inches, a bag 24 is afforded which is of a practical size so that it affords a compact package and yet provides ample space for carrying other articles such as the aforementioned swimming suits, towels, lunches, and the like, in the bag 24 together with the back-rest 22.

When it is desired to convert my novel combination back-rest and bag 28 into a seat for use at the beach, or the like, this may be readily accomplished by stripping or peeling the

sheets

71 and 72 forming the side walls of the bag 24 downwardly relative to the back-rest 22 from the position shown in Fig. 1 into the inside-out position shown in Figs. 2 to 4, inclusive. The brace 48 may then be swung outwardly around the cross bar 33 into a downwardly and outwardly projecting position relative to the back-supporting member 28, such as shown in Fig. 3, and the back-rest 22 may be disposed on the ground with the cross bar 32 and the leg 52 disposed in groundengaging position, and with the bag 24 spread out on the ground forwardly of the cross brace 32, Figs. 2 and 3. In so adjusting the brace 48, it may be swung out into any one of a number of positions to thereby support the back-supporting member 22 in various upright positions wherein it is disposed at varying angles of inclination assen /4 5 to the horizontal such as, for example, the two positions shown in solid lines and broken lines, respectively, in Fig. 2. When the brace 48 has been disposed in proper position to support the back-supporting member 28 at the desired inclination to the horizontal, the brace 60 may i be pivoted upwardly and rearwardly in a counterclockwise direction as viewed in Fig. 3 to thereby similarly pivot the overlying panel 43 in the same direction upwardly into a position wherein it projects upwardly from the backsupporting member 28 in substantially longitudinal alignment therewith, as shown in Fig. 3. The intermediate leg 64 of the brace 60 may then be disposed in the proper pair of notches 69 inthe flanges 43a and 43b on the panel 43to thereby support the panel 43 in such upwardly extending position and to thereby afford an effective headrest 41 projecting upwardly above the back supporting member 28.

It will be seen that when the back-supporting member 28 is disposed in a relatively upright back-supporting position, such as the position shown in solid lines in Figs. 2 and 3, the brace 54, which depends from the cross bar 33 terminates at its lower end portion in spaced relation to the ground or other supporting surface on which the cross bar 32 and the leg 52 is disposed. However, when the back-supporting member 28 is disposed in its lowermost inclined position such as shown in broken lines in Fig. 2, wherein the brace 48 projects outwardly from the back-supporting member 28 at a greater downwardly opening angle than the position thereof shown in the aforementioned solid lines, the brace 54 also engages the r ground, or other supporting surface, and is disposed in substantially upright position to thereby afford an effective auxiliary support which is effective to assist the brace 43 in supporting the back-supporting member 28 in this lowered position, wherein the downward force on the member 28 occasioned by a person reclining on the seat afforded by the combination back-rest and bag is relatively great. When the back-supporting member 28 is moved to other positions such as, for example, the aforementioned lowermost position such as shown in broken lines in Fig. 2, the brace 69 may be pivoted in the brackets 66 and 67 into the proper position to engage the leg 64 thereof in the proper pair of notches 69 so that the panel 43 continues to project upwardly from the backsupporting member 28 in substantially longitudinal alignment therewith to thereby afford an effective head-rest,

When it is desired to again dispose the parts of my novel combination back-rest and bag in carrying position, it may be picked up by the panel 38, the

braces

48, 54 and 60 and the head-rest panel 43 may be swung downwardly into their aforementioned depending collapsed position, and the bag 24 may be turned right-side-out upwardly around the back-rest 22 to thereby dispose the combination back-rest and bag 24 in carrying position as shown in Fig. 1. 1

It will be seen that my novel back-rest and carrying bag 20 afiords an effective carrying bag for the backrest 22, and other articles, when it is disposed in carrying position as shown in Fig. l and, when disposed in an erected position such as shown in Figs. 2 and 3, the bag 24 affords an effective seat on which a person may sit, and the back-supporting member 22 affords an effective, adjustable support for the back of the person, and the panel 43 affords an effective head-support for the person.

In Figs. 7 to 10, inclusive, a modified form of my invention is shown wherein parts which are the same as parts shown in Figs. 1 to 6, inclusive, are indicated by the same reference numerals, and parts which are similar to parts shown in Figs. 1 to 6, inclusive, are indicated by the same reference numerals with the prefix 1 added thereto.

Thus, it will be seen that in Figs. 7 to 10, inclusive, of the drawings a combination back-rest and bag 1264 is shown which embodies a bag 24 attached to a backrest 122. The baclorest 1.212, in this instance, embodies side rails 3t) and 31 having a cross bar 32 extending between the lower end portions thereof, and a panel 138 is attached to the upper end portions of the side rails .30 and 31. The panel 138 is secured to the side rails 30 and 31 by suitable means such as bolts 39, two of the bolts 39 extending through each of the flanges 38a and 33b of the panel 138 and through the adjacent side rails 30 and 31, respectively, The panel 138 differs from the panel 38 in that it is bowed rearwardly between the side rails and 31 to thereby afford a more form fitting back engaging member for the back-supporting member 128. p

The brace 148 shown in Figs. 6 to 10, inclusive is identical in construction to the brace 43 shown in Figs. 1 to 6, inclusive, except that the upper end portions of the

legs

150 and 151 thereof are rounded, and are so pivoted on the lowermost bolts 39 of the respective pairs of bolts 39 mounted in the side rails 30 and 31 that, when the brace 148 is pivoted from collapsed position as shown in solid lines in Figs. 8 and 10, to extended position as shown in broken lines in Fig. 10, the upper end portions of the side legs 15f) and 15B. are swung into abutting engagement with the rear face of the front flanges of the

legs

30 and 31 to thereby hold the brace 148 against further outward swinging movement relative to the back-supporting member 128.

Also, in the modified form of my invention shown in Figs. 7 to 10, inclusive, the head-rest 41 of the form of the invention shown in Figs. 1 to 6, inclusive, has been eliminated, to thereby afford an especially economical manufactured combination back-rest and bag.

In the modified form of my invention shown in Figs. 7 to 10, inclusive, the brace 148 may be disposed in collapsed position relative to the back-supporting member 128, as shown in Fig. 9, and when the parts of the back-rest 122 are disposed in this position, the bag 24 of the combination back-rest and bag 1249 maybe pulled upwardly into right-side-out position, not shown, corresponding to that shown in Fig. 1 to thereby dispose the back-rest 122 within the bag 24.

When it is desired to dispose the combination back-rest and bag in erected position, the bag 24 may be peeled downwardly off from the back-rest 122, the brace 148 may be swung outwardly away from the back-supporting member 128, and the combination back-rest and bag 126 then be disposed in position wherein the cross bar 32 of the back-supporting member 128, and the intermediate leg 52 of the brace 14S, rest on the ground, or other suitable supporting surface, with the bag 24 disposed in horizontally outwardly projecting position relative to the cross bar 32, Fig. 7.

From the foregoing it will be seen that have afforded a novel combination back-rest and bag which may be readily and economically produced commercially.

Also, it will be seen that I have afforded a novel combination back-rest and bag which affords a novel carrying case not only for the back-supporting member but also for other articles which it may be desired to carry therein.

Also, it will be seen that I have afforded a novel backrest and bag which may be quickly and easily converted from carrying position to erected position and baclt again.

Thus, while I have illustrated and described the preferred embodiment of my invention, it is to be understood that this is capable of variation and modification, and I therefore do not wish to be limited to the precise details set forth, but desire to avail myself of such changes and alternations as fall within the purview of the following claims.

I claim:

1. An article of manufacture comprising a back-rest, and a bag affording a cavity of capacity to receive said back-rest, said bag having a substantially closed bottom, an open top, and side portions extending between said bottom and said top, all of said side portions being substantially closed, said bag including means which flexibly attach the bag to said back-rest and which enable the bag while attached to the back-rest to be inverted about its attachment to said back-rest between a normal position, wherein said side portions are disposed in enclosing relation around said back-rest, and an actuated position wherein said bag remains attached to said back-rest but projects away from and fully discloses said back-rest to afford a seat.

2. An article of manufacture comprising a back-rest having an upper end portion and a lower end portion, and a bag having a substantially closed bottom end, closed side walls, and an open top end, said bottom end of said bag being flexibly attached to said lower end portion of said baclorest and invertible with respect thereto so as to provide a laterally extending seat.

3. An article of manufacture comprising an elongated bag, and a back-rest normally disposed in said bag, said bag comprising a continuous sheath of flexible material affording a cavity in which said back-rest can be normally disposed and having an open top and a substantially closed bottom, and said bottom of the bag being flexibly looped to an end portion of said back-rest so as to be invertible relative thereto from a right-side-out position enfolding said back-rest to an inside-out position extending longitudinally outwardly in projecting relation relative to said back-rest to afford a seat.

4. An article of manufacture comprising a back-rest comprising an elongated back-supporting member having an upper end portion and a bottom end portion, a brace pivotally mounted on and carried by said back-supporting member, said brace being movable on said back-supporting member between a closed position, wherein it is disposed in juxtaposition to said back-supporting member, and an open position, wherein it projects away from said back-supporting member at a downwardly opening acute angle, two elongated sheets of flexible material secured together along one end edge portion and two oppositely disposed longitudinal edge portions, and means attaching said one end portion to said bottom end portion, said sheets being movable between an outwardly projecting position relative to said back-supporting member, in which position said sheets afford a seat projecting from said back-rest, and another position wherein said sheets are disposed on opposite sides of said back-rest, in which latter position said sheets afford a bag disposed around said back-rest.

5. A combination back-rest and bag comprising a bag having an open top and a substantially closed bottom,

and a back-rest having a lower end flexibly attached to said bottom of the bag and normally disposed in said bag, said bag being invertible with respect to said backrest so as to remove said back-rest therefrom and into an acutated position by peeling the bag from the backrest wherein the back-rest is disposed in upwardly inclined position and said bag is disposed in horizontally projecting position relative to said back-rest in position to form a seat, said back-rest comprising a back-supporting panel, and tWo braces pivotally mounted on said panel in depending relation thereto, said braces extending downwardly to the same level when said back-rest is disposed in one of said actuated positions, and one of said braces extending downwardly to a lower level than the other of said braces when said back-rest is disposed in another of said actuated positions.

6. A combination back-rest and bag comprising a bag having an open top and a substantially closed bottom, and a back-rest having a lower end flexibly attached to said bottom of the bag and normally disposed in said bag, said bag being invertible with respect to said backrest so as to remove said back-rest therefrom and into an actuated position wherein it is disposed in upwardly inclined position and said bag is disposed in horizontally projecting position relative to saidback-rest in position to form a seat, said back-rest comprising a back-supporting panel, means for supporting said panel in upright position, a head-rest panel pivotally mounted on said backsupporting panel for movement into and out of upwardly projecting position relative to said back-supporting panel, and means mounted on said back-supporting panel and releasably engageable with said head-rest panel for releasably supporting the latter in said upwardly projecting position.

7. A combination back-rest and bag comprising a bag having an open top, substantially closed sides, and a substantially closed bottom, said bag having a right-sideout position and a reversed inside-out position, and a back-rest flexibly attached at its lower end to said bag so as to be disposed in said bag when said bag is in said right-side-out position, and it is disposed outside of said bag, with said bag projecting therefrom, when said bag is disposed in said inside-out position.

8. A combination back-rest and bag as defined in claim 7 and in which said back-rest comprises a backsupporting member, and a brace pivotally mounted on said back-supporting member for movement between a collapsed position, wherein it is disposed in closely adjacent substantially parallel relation to said back-sup porting member, and an erected position wherein said brace projects from said back-supporting member at a downwardly opening acute angle relative thereto.

9. An article of manufacture comprising a back-rest comprising an elongated frame having an upper end portion and a lower end portion, a panel mounted on the upper end portion of said frame, and bracing means pivotally mounted on and carried by said frame for movement between a collapsed position and an erected position, said means being disposed closely adjacent said frame in substantially parallel relation thereto when said means are disposed in said collapsed position, said means being disposed in downwardly and outwardly projecting relation to said frame when said means are disposed in said actuated position, said back-rest being adapted to be supported in upwardly projecting position on the ground on said lower end portion and said means when said means are disposed in said erected position, and a bag for said back-rest having an open top, a closed bottom, and a continuous side wall extending between said open top and said closed bottom, said closed bottom being attached to said'bottom end portion of said frame so that said bag may be inverted about its attachment to said lower end portion of said frame to a position wherein said side wall projects longitudinally outwardly from said bottom end portion of said frame on the opposite side of said frame from said means, when said means are disposed in,,said erected position.

10. An article of manufacture as defined in claim 9 and in which said means comprises two substantially U-shaped members pivotally mounted on said frame in position to both engage saidground when said means are disposed in said erected position, and in which one of said U-shaped members projects from said frame a lesser distance than the other of said U-shaped members when said means are disposed in said erected position.

References Cited ,in the file of this patent UNITED STATES PATENTS 318,368 Gitt May 19, 1885 405,038 Koechling June 11, 1889 1,209,808 Burgess Dec. 26, 1916 1,842,424 Ponten et al. Jan. 26, 1932 2,047,035 Rosenberg July 7, 1936 2,615,501 Neiborn Oct. 28, 1952