US2558315A

US2558315A - Grandstand seat backrest

Info

Publication number: US2558315A
Application number: US702790A
Authority: US
Inventors: Thomas F Pavey; Doyle L Mcdowell
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-10-11
Filing date: 1946-10-11
Publication date: 1951-06-26
Anticipated expiration: 1968-06-26

Description

June 26, 1951 T. F. PAVEY ETAL 2,558,315

GRANDSTAND SEAT BACKREST Filed Oct. 11, 1946 5 Z 7 9 lllllllllllmzl /0 F/ G. 4, INVENTORJ Patented June 26, 1951 iU ED IS'TATESM PATENT OFFICE GRAN DSTAND SEAT BACKREST Thomas F. Pavey and Doyle L. McDowell, Maricopa County, Ariz.

Application October 11, 1946, Serial No. 702,790

2 Claims. (Cl. 155-133) This invention relates to backrests for grandstand seats and has for its objects:

First, the provision of a backrest which may be easily attached to and detached from a grandstand seat of the type usually provided and consisting of a plank about two inches thick and twelve inches wide.

Second, the provision of a backrest which may be folded flat when not in use;

Third, the provision of such a backrest which is adjustable as to the thickness and width of the seat plank;

Fourth, the provision of such a backrest wherein the back member is held in position by engagement with the back edge of the seat plank while the front of the seat portion engages the front edge of the plank in adjustable relation therewith.

Other objects will appear hereinafter.

We attain the foregoing objects by means of the construction and device shown in the accompanying drawing, in which:

Figure 1 is a perspective view of our device;

Figure 2 a side elevation thereof;

- Figure 3 a rear elevation thereof, and

Figure 4 an enlarged side elevation of the plank hook and adjustable screws.

Similar numerals refer to similar parts in the several views.

The rest consists mainly of a seat frame 2 and a back bow 3, hinged thereto.

The seat frame is made of flat metal shaped to form a U. The ends of the side members or arms 4 of this frame are welded to a transverse hinge rod 5 which extends through the lower portions of the arms of back bow 3. In the middle of the web portion 6 of frame 2, a seat hook I is formed and proportioned to depend and extend down and under the front edge of the seat plank 8. An adjusting screw 9 is threaded into the front face of this hook and bears against the front edge of plank 8.

The arms of the back bow extend downward beyond hinge rod 5 and form stops H! which engage against the rear edge of seat plank 8. A tightly stretched canvas web l2 completes the back, and the top bar M of the back is swept back as shown in Fig. 2, to place this web in position to take most of the users weight.

In use, the seat frame 2 is placed fiat on the grandstand seat plank 8 with the hook I extending over the front edge. The back 3 is then raised and the stops l0 engaged against the rear edge of the plank to maintain the back in the position shown in Figure 2. Adjustment of the angle of the back may then be made by turning screw 9. A pad l3 may be provided to aid engagement with plank 8. It is to be noticed that the seat frame 2 rests flat on the top of plank 8 and that no angular braces or links between the back and the frame are needed. In this way the inconvenience of these devices, which obstruct the use of the full width of the seat, is avoided.

The seat frame 2 may be made in various sizes where seat planks vary extensively in width. However, small variations in width can be accommodated by the use of adjusting screw 9 as explained.

After use the back 3 is hinged forward to release plank 8. It may then be swung counter clockwise until back top bar 14 meets hook I. This makes a flat compact arrangement and large numbers of the folded back rests may be readily stacked.

We claim:

1. A backrest for grandstand seats comprising a frame, adapted to lie flat on a grandstand. seat plank, having a depending hook on its forward portion shaped to engage the under side adjacent the front edge of a grandstand seat plank, an adjusting screw threaded in the forward portion of said hook adapted to bear on the forward edge of said seat plank, an inverted U-shaped back bow having a web supported across its upper portions, and a transverse hinge rod projecting through the lower portions of its depending sides, the rear portion of said frame being secured to said rod, said rod being positioned above the lower ends of the sides of said back bow, the extremities of said back bow beyond said rod forming stops adapted to engage against the rear edge of said seat plank, and draw said depending hook back upon the front edge of said seat plank.

2. A backrest for grandstand seat planks comprising a U-shaped seat frame having a depending hook along its web portion adapted to be positioned adjacent the forward edge of a seat plank so that said hook engages under the forward edge of said plank, an adjusting screw threaded into said hook operative transversely of said seat plank and having a pad adapted to bear on the front edge thereof, a back bow formed as an inverted U with a hinge rod projecting through the arms thereof near their lower ends, said lower ends forming stops adapted to clampably bear against the rear edge of said seat plank and draw said depending hook rearward onto the forward edge of said plank and bring the inner end of said adjusting screw into contact therewith; the upper part of said back REFERENCES CITED bow bemg swept back and a canvas Web lommg The following references are of record in the the arms of said back bow intermediate said back file of this patent:

swept portion and said hinge rod; the rear ends of the arms of said seat frame being attached 5 UNITED STATES PATENTS to said hinge rod intermediate the arms of said Number Name Dat back bow. 1368,2372 Beskow Sept. 25, 1923 r THOMAS PAVEYZ V 1*,809;392: Ronten r -r June 9, 1931 DOYLE L; McDOWEL r 2152,0114 Ashe De'c'.,-4, 1933 2,383,041 Campbell Aug. 21, 1945