US231891A - Elevator - Google Patents

Description

(No Model.) 2 shetsi-sheet 2.

-P. BAKER. Eleva tor.

No, 231,891. Patented Sept. 7,1880.

HHHTHIIIII IIIIIIJJIIIH I I UNITED STATES PATENT rrc.

PHILANDER BAKER, OF BOSTON, MASSACHUSETTS.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 231,891, dated September '7, 1880.

Application filed July 27, 1880.

an elevator, with its running-gear, in such a manner as to obviate entirely all danger of the elevator falling in the event of the breaking or giving away of the rope by which the elevator is hoisted or the belt which rotates the shaft; and the invention consists in the employment of a rope, or other suitable equivalent material, secured to a plunger attached to the car of an elevator, said rope and piston being inclosed within a vertical tube or re cess in the franie of the elevator, which tube is slotted so as to admit of the connection with the elevator of the inclosed rope in the tube in the frame. The said rope is wound upon a spirally-grooved cylinder which is inclosed within a casing provided with a tube, through which the rope passes to the tube or recess in the frame of the elevator. Two grooi'ed cylinders are employed, one for each rope, and on the shaft of each cylinder is a gear-wheel, the two wheels gearing with each other, and consequently rotating in opposite directions. The extension of the shaft on which the grooved cylinder is mounted is screw threaded, and projects through the opposite side or end of the casing to insure the proper rotation of the grooved cylinders in winding and unwinding the ropes. The rope or its equivalent is designed to fit snugly in the tube in the frame, so that in case the hoisting-ropes or the belt break or give away the ropes in the tubes at the sides of the car will become packed or distended to such an extent as to prevent the descent of the elevator-car beyond the limit required for the packing of the rope, and the greater the weight of the car the more firmly will the rope be packed.

Referring to the drawings, Figure 1 is a vertical transverse section of an elevator embodying my invention. Fig. 2 is a View of the grooved cylinder with the casing partly broken away. Fig.3 is an elevation of the device for disconnecting the running-gear from the shaft. Fig. 4 is a plan view of a portion of the same enlarged.

(No model.)

A A represent the frame-work of an elevator. 13 is the car attached to the hoisting-rope O, which passes over the pulley D, and is wound on the drum Q, secured to the shaft P.

To each side of the car 13 is attached a tube or piston, G, which may extend the whole length of the car, or only partially so, as shown in Fig. 1. The tube or piston G fits snugly, but so as to move freely within a tube, F, ar-

-ranged vertically in each side of the frame,

and is connected to the sides of the car by means of a plate and a web, 9, which latter fits within the slot of tube F, so as to admit of passing freely up and down in said slot. The device serves also as a guide to the elevator-car.

Within the tubes or pistons G are firmly se cured ropes H, which pass down and are wound upon drums K, which are constructed with spiral grooves, as shown in Fig. 2. The portion of the drums K upon which the rope H is wound is inclosed within a casing, I, and at the upper part of said casing, at the point where the rope H winds upon or unwinds from the grooved cylinder, is a tube, L, through which the rope H passes and is guided to the tube F in the elevator-frame, the opening of said tube being directly over the tube L.

.One end of the shaft M, on which the drum K is mounted, is formed'with a screw-thread, as shown at N, Fig. 2, which works in a female screw in the bearing of the shaft, by which means, as the shaft and drum rotate, a regular and steady feed is given to the rope H in winding and unwinding. A spline on the shaftM, at the opposite end from the screw, admits of its sliding through its bearing in the gear-wheel O correspondingly' with the longitudinal movement of the screw N. The gear-wheels O on each shaft of the grooved cylinders mesh with each other, so 'as to cause them to act simultaneously and correspondingly.

Motion is imparted to gear-wheels 0 from a gear on the shaft 1?; but instead of such gear a belt may be arranged to connect one of the shafts-M, on which the grooved cylinder K is mounted, directly with a main shaft to which power is applied, which latter is not shown in the drawings.

In the event of the breaking of the rope by which the car is hoisted or the belt which rotates the shaft 1?, I employ a means for disconnecting the winding-spool from said shaft, as shown in Figs. 1, 3, and 4.

P is the shaft that carries the drum or spool Q, on which the rope O is wound, and also carries the belt 0, running over a pulley, J, and connecting with a power-shaft. On the shaft 1? are arranged the coupling devices V V, consisting of clutches which slide on the shaft I, and are caused to engage or disengage with clutches connected with the drum Q and the band-pulley J respectively. The clutches V V are operated by means of levers w 00, pivoted to arms W W, and levers u a, attached to rock-shafts T T, forming a part of bell-crank lever B. The upper ends of levers It R incline toward the hoisting-rope O and the belt 0 respectively, and are provided with rollers S S, which bear upon the said rope and belt, as shown. Should either the rope or the belt break or give away the lever B and roller S will, by their weight, fall forward, causing the lever to to operate, through the arms W and lever 00, todisconnect the clutch V or V, and

thus stop the rotation of the drum Q or the' belt 0 accordingly.

As an auxiliary device for preventing the fall of the elevator-car in case of accident to the hoisting-rope, I arrange a rope, a, which passes down each side of the elevator-frame and over pulleys on the upper ends of the frame, and also over the journal-box 0, in which the shaft E is journaled. The said journalbox is mounted on springs, so as to allow the shaft E to rise whenever the power that keeps it down is removed.

To the lower ends of the rope at each side of the elevator-frame are attached small frames which surround a barin the frame A, in which the rope H is inclosed. The ends of the rope to are secured to the small frame at b, and said frame is pivoted at its center f f, so that as the portion 1) is pulled up the opposite portion, 0, will be forced down and clamp the rope H, thus preventing it from moving. This operation will only be effected in the event of the breaking of the hoisting-rope .0, which will allow the shaft E'to rise in the spring journalboX, thus raising the rope to and operating the small frames 1) c, as described.

In Fig. 2 the screw N is shown as a continuation of the shaft M, and is caused to move longitudinally in its bearing. It may, however, be fixed within the drum or casing I, and made to enter a female screw formed within the grooved cylinder K, so that the screw shall remain stationary and the grooved cylinder move longitudinally on the screw.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In an elevator, the rope H, attached to the car B, and working in a slotted tube in the frame of the elevator, so that in the event of the breaking of the hoisting-rope the downward motion of the car will be arrested by the packing of the rope in the said tube, substantially as set forth 2. The grooved cylinder K, operating in connection with a screw, N, in combination with the rope H, substantially as and for the purpose specified.

3. The combination of the grooved cylinder K, the casing I, provided with the tube L, and the rope H, substantially as and for the purpose set forth.

4. The tube or piston G, attached to the elevator-car B, in combination with the rope H and the slotted tube F, as and for the purpose described.

5. In combination with an elevator, the rope a, arranged to pass over a shaft journaled in a spring journal box and connected at its lower end with frames b c, in combination with the rope H, as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PHILANDER BAKER.

Witnesses J. H. ADAMS, RALPH HAsKINs.

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