US293050A

US293050A - t thomas meadoo

Info

Publication number: US293050A
Authority: US
Publication date: 1884-02-05
Anticipated expiration: 1901-02-05

Description

(No Model.)

T. MQ'ADOO.

ELEVATOR.

"Patentd Fe b. 5,1884.

INVENTOR Thoma: Ma 5 100 WITNESSES:

A ATTORNEYS @ATENT Er ch.

"rn'oMi-is MQADOO, onnnwvorni, it; Y.

ELEVATOR.

SPECIFIQATION forming part ofLetters Patent No. 293,050, dated February 5, 1884.

Application filed Julyfll, 1883. (No model.)

To all whom it 17mg concern:

tion.

This invention relates to a check for an elevator-car which allows the car to ascend freely, while it prevents said car in its descent from falling or from moving with an undue velocity."

The peculiar and novel construction of my check is pointed out in the following specification and illustrated in the accompanying drawings, in which Figure 1 represents a horizontal section of the check mechanism in the plane a m, Fig. 2. Fig. 2 is a longitudinal vertical section in the plane y y, Fig. 1.

Similar letters indicate corresponding parts.

This check mechanism is secured to the bottom of the car, which moves up and down between the vertical posts A A. Said check mechanism consists of two cylinders, B B, which are open at their inner ends,while their outer ends are connected by a U-shaped-pipe, 0. Each of the cylinders is providedwith a piston, D D, respectively, and a small tube,

E, extendsfrom one cylinder to the other, said tube being situated near the outer ends of the cylinders, as shown in the drawings.

In the interior of the pipe 0 is situated a check-valve, F, which opens when the piston D moves inward, and which closes when the piston D moves inward. Said pistons move in opposite directions, and a reciprocating motion is imparted to them by means of eccentrics G G, which are mounted on a shaft, H.

Instead of eccentrics, I can employ cranks or other equivalent means.

The shaft H has its bearings in hangers I, which are firmly secured to the bottom of the car, and on the outer ends of said shaft are firmly mounted worm-wheels J J. ,which gear into worms K K, mounted on shafts L L.

These shafts have their bearings in hangers l\I M,wl1ich are secured to the bottom of the car, and on said shafts are mounted cog-wheels N N,which engage with toothed racks 00, fastened to the vertical posts A A and extending from the bottom of the elevator-well to its top.

The cylinders BB and the pipe 0 are charged with a suitable liquid-such as glycerine-and when the car is clear down the pistons DD occupy the positions shown in Fig. 1, the piston D being at the outer and the piston D at the inner end of its stroke. WVhen the elevator-car i s raised up the cog-wheels N N revolve,

and a slow revolving motion is imparted to V the shaft H, so that the piston D is forced i11- ward, while the piston D moves outward.

During the upward motion of the car, therefore,the liquid contained in cylinder B and in the pipe 0 is gradually forced into the cylinder B, and since the check-valve F opens,when the piston D moves inward, fio perceptible 0bstruction is producedby the liquid. The motion of the pistons D D.is so gaged that when the elevator car has moved clear up to the top of the well the piston D .has reached theinner When the car descends, the piston D moves i11- ward and the piston D outward, the check valve F closes by the pressure of the liquid on its back, and the liquid which is gradually displaced from the cylinder Bwhilethe piston D moves inward has to pass through the small tube E in order to reach the cylinder 13. The liquid therefore creates a material obstruction to the downward motion of the car, and it will be readily seen that, even if theropezfromwhich the car is suspended should break,-the downward motion of the car will be checked to such an extent that no accident can happen.

The tube E may be provided with a cock, so that the flow of the liquid through said tube can be regulated, and by closing this stop-cock the downward motion of the car canbe arrested. It must also be remarked that the mechanism for imparting to the pistons D Da reciprocating motion in opposite directions can be modified in various ways, and I do not wish to conline myself to the exact mechanism shown in the drawingstbut this mechanism will give a good result, it is easily applied, and not liable to get out of order. p

What I claim as new, and desireto secure by Letters Patent, is-,

1. The combination, substantially as hereinbefore described, with an elevator-car, of two cylinders fastened to the car, the pipe 0, and

the tube E, connecting said cylinders, the check-valve in the pipe 0, the pistons moving in the two cylinders, and suitable mechanism .7 and the piston D the outer end of its stroke.

for imparting to the pistons a reciprocating shaft H, and suitable means for transmitting v motion in opposite directions. motion from the shaft H to thepistons D D.

2. Theeombination, substantially as herein- In testimony whereof I have hereunto set before described, with an elevator-car, of two my hand and seal in the presence of two sub- 5 cylinders fastened to the bottom of the car, the scribing witnesses, pipe 0, and tubeE connecting said cylinders,

the check-valv'ein the pipe 0, the pistons mov- THOS' MOADOO' ing in the two cylinders, the toothed racks se- \Vitnesses: cured to the posts A A, the cog-wheels N N, JOHN Monnis, 1O shafts L L, worms K K, worm-wheels J J, 'CHAS. VVAHLERs.