US1696557A - Safety elevator - Google Patents

Description

L A TOMLIN SAFETY ELEVATOR Filed April 28, 1925 Dec. 25, 1928.

. A Z 4. .1 l 5 M I a 5 do ,i n m a w H M u mmue 4 z Patented Dec. 25, 1928.

UNITED STATES LEON A. TOMLIN, OF BALTIMORE, MARYLAND.

SAFETY ELEVATOR.

Application filed April 28, 1925.

This invention relates to improvements in safety elevators, and has for its object to provide a simple and eflicient device for elevators, which, should the elevator cable break, will be automatically operated to stop the elevator immediately upon the breaking of said cable.

The invention consists of the novel construct-ion and arrangement of the parts and combination of parts hereinafter more fully set forth in the following specification and pointed out in detail in the appended claim.

In the accompanying drawing,-

Figure 1 is a front elevation of an elevator cage and guide rails upon which the cage operates, and showing my invention applied thereto.

Figure 2 is a similar view to Figure 1, showing the position of the parts when the cable breaks.

Figure 3 is a section taken on the line 22 of Figure 1.

Referring to the accompanying drawings, forming part of this specification, and in which like reference numerals designate like parts throughout the several views thereof, 1 designates the elevator cage to which is se cured a frame 2 having a cross piece 3 between the top of the cage and the upper cross piece 20 of the frame 2. At the sides of the elevator cage 1 are guide rails a in which the guide shoes 21 operate. The said guide shoes 21 are rigidly secured to the upper and lower ends of the frame 2. The cable 6 upon which the elevator cage is suspended is secured to the upper end of the rod 7 which latter projects throughthe upper cross-piece of the frame 2 and has its lower end screw threaded and is screwed into the block 8 and held from turning therein by the set screw 9. Between the block 8 and the upper cross piece of the frame 2 is a coiled spring 10 which is normally under compression. The rod 11 has its upper end screw-threaded and is screwed into the block 8 and isrheld from turning therein by the set screw 12. The lower end of the rod 11 is provided with a head 13, and between said head 13 and the cross-piece 3 Serial No. 26,325.

is a coiled spring 14 which is also normally under compression. In the opposite sides of the block 8 are recesses 15 into which the inner ends of the rods 1.6 a e pivoted at 17 and the outer ends of said rods 16 project through the side of the frame 2 and are each provided with the pivoted brake shoes 5, the inner ends of which shoes are normally against the frame 2 and are shaped to lit the guide rails t when released by the breaking of the cable 6. t

hen the elevator is in operation the parts assume the position shown in Figure l, with the springs 10 and 14; being under compres sion, and should the cable 6 break, the springs 10 and 1% will immediately force the block 8 down, which causes the rods 16 to force the shoes 18 against the guide rails l,

as shown in Figure 2, and hold the elevator V cage against falling, as the weight of the elevator on the block 8 forces the brake shoes tightly against the guide rails.

Having thus described my invention, what I claim is:

-The combination of an elevator, a frame secured to the elevator, guide rails on each side of said elevator, guide shoes rigidly se cured to the upper and lower ends of said frame, a rod projecting through the top of said frame, a cable having one end secured to the upper end of said rod, a block into which the lower end of said rod is secured, a coiled spring between the upper cross piece of the frame and said block, a second rod having its upper end secured to said block and provided with a head on its lower end, a second cross piece secured to said frame between said first named cross piece and the elevator, a coiled spring surrounding the last named rod between the said head and said. second cross piece, rods projecting from opposite sides of said block and having their outer ends projecting through the sides of said frame, and a brake shoe pivoted to the end of each of said last named rods and projecting into the guide rails.

In testimony whereof I afiix my signature.

LEON A. TOMLTN.

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