US1055252A - Safety device for elevators. - Google Patents

Description

B. & G. E. BAUMER.

.SAFETY DEVICE FOR ELEVATORS.

APPLICATION FILED APILZE, 1012.

1,055,252, PatentedMarA, 1913.

2 SHEETS-SHEET 1.

WITNESSES Q2 5 INVENTORS W a- 44' CLARENCE E BAUNER V BA u M ER hr Altpme B. & O. E. BAUMER.

SAFETY DEVIUE FOR ELEVATORS.

APPLICATION FILED APB..25, 1912.

1,055,252, Patented Mar. 4, 1913.

2 SHEETS-SHEET 2.

WITNESSES INVENTORS W CLARENCE E BAUMER X B Ewrm A B m: MER r M v heQv Allarm' UNITED STATES PATENT OFFICE.

BERTHA BAUMER, OF ATLANTA, GEORGIA, AND CLARENCE E. BAUMER, OF TROY, OHIO.

SAFETY DEVICE FOR ELEVATORS.

To all whom it may conccrn x' Be it known that we, BERTIIA Barnum and CLARENCE E. Barnum, citizens of the United States, the said Bnn'rln Barnum: residing at Atlanta, county of Fulton, and State of Georgia, and the said CLARENCE E. BAUMER residing at Troy, in the county of Miami and State of Ohio, have invented certain new and useful Improvements in Safety Devices for Elevators, of which the following is a specification, reference being had therein to the accompanying drawing. 4

This invention relates to safety devices for elevators and has special reference to a safety device of improved character wherein the cable used to hoist the elevator is also used as a conductor for electric current, which, upon being interrupted by the breakage of the cable permits the safety device to be thrown into action.

The principal object of the invention is to improve and simplify the general construction of devices of this character.

A second object of the invention is to provide a novel form of safety device wherein an air cushioning apparatus is used to gradually check the speed of the car. A third object of the invention is to provide means whereby a car running away either in ascent or descent will be checked by the automatic application of an improved safety device.

With the above and other objects in view, this invention consists in general of certain novel constructions, combinations and arrangements of parts, as will be hereinafter fully described, illustrated in the accompanying drawings, and specifically claimed.

In the accompanying drawings, like characters of reference indicate like parts in the several views, and Figure 1 is a section through an elevator well showing an elevator equipped with the safety device. Fig. 2 is a bottom plan view of an elevator car with the safety device in position. Fig. 3 is an enlarged detailed section on line 33 of Fig. 2. Fig. 4 is a section On line t -t of Fig. 2. Fig. 5 is a diagrammatic view showing the wiring arrangement.

In the embodiment of the invention herein shown there is provided an elevator shaft 10 having a car 11 moving therein and supported by a cable 12. This cable 12 is electrically connected to a suitable source of electricity, as the generator 13, and in the Specification of Letters Patent.

Application filed April 25, 1912.

Patented Mar. 4, 1913.

Serial No. 693,204.

elevator shaft are guides 14: which are likewise connected to the generator 13.

Extending transverse the bottom of the car is a crank shaft 15 and on each end of said shaft 15 is mounted a toothed wheel 16 which meshes with a rack bar 17 carried by the respective elevator guide and extending from top to bottom of the well.

Diagonally disposed on the bottom of the car are two cylinders 18 and these cylinders are located on opposite sides of the bottom of the elevator car. Each of these cylinders is provided with the usual piston and has a rod 19 connected by a link 20 with a crank 21 on the shaft 15, said cranks 21 being arranged at an angle of 180.

Suitably positioned on the bottom of the car are valves 22, the casings whereof are connected by pipes 23 with the ends of the respective cylinders 18. These valves are controlled by levers 21 all connected to a bar 25 actuated by a lever 26 projecting upward through an opening 27 in the bottom of the car so that the valves may be controlled manually by the operator.

At each end of the shaft 15 are certain controlling devices which will now be described.

On the shaft 15 is splined a sleeve 28 while secured to the gear 16 is a recessed clutch member 29 which is adapted to be engaged by a clutch member 30 splined upon the sleeve 28. The clutch member 30 is formed with a projection having an annular groove 31 in which is mounted the arms of a fork 32 carried on one end of a lever 33 pivoted intermediate its ends beneath the floor of the elevator car.

Extending up through the elevator car is an operating lever 34, to the lower end of which is connected a rod 35 and one of the levers 33 has its end connected to this rod 35 while the other lever 33 is shorter and has a pin and slot connection With a lever 36 the remaining end of which is connected to said rod 35. By means of this construc tion the lever 34 may be used to throw the clutches in and out of engagement. The projection of the head 30 is formed with a second annular groove 37 having an annular socket 38 in which is located one end of a coil spring 39, said spring encircling the sleeve 28. The other end of said spring 39 bears against the disk 40 slidable longitudinally on the sleeve 28 and splined thereto.

This disk 40 is provided on its periphery with clutching pawls 41 pivoted thereto and each having a rear curved portion 42 bearing against a curved recess 43 in a disk 44 splined upon the sleeve 11, the forwardly projecting ends of the pawls 41 normally engaging the groove 37 in the projection of the clutch 30, thus holding said clutch out of engagement with the head 29. In this position the rear projecting portion 42 of each pawl 41 is forced outward by means of a compression spring 46. These clutching pawls 41 are released from engagement with the clutch 80 by means of a fork 47 located in an annular groove 48 in the disk 44, said fork 47 being on the end of a double arm lever 50 pivotally connected at its other end to a slidable contact bar 51 through the medium of a bell crank lever 51 normally held against the armature of a magnet 52 mounted on the bottom of the car. The disk 44 has projecting therefrom a socket member 54 in which is located a slidable member 55 mounted on the sleeve 28. This slidable member 55 is provided with lugs 56 projecting through slots in the member 54 and pivoted to these lugs are levers 57 having ends 58 which bear against the member 54, and these levers carry governor balls 59 on their outer ends.

Gears 16 are mounted. on sleeves at each end of the shaft 14 and these gears mesh with the respective rack bars 17 carried by the guides 14. The clutch members 29 are connected to these last-mentioned sleeves to revolve therewith.

Suitably mounted on the bottom of the car are brackets 61 and between these brackets 61 and the bar 51 are springs 62 which normally urge said bar away from the magnet. This magnet is connected at one end by a wire 63 with the shaft 15 while the other end of the magnet is connected by a wire 64 wit-h the hoisting cable 12.

In the operation of the device if it is desired to set the clutches by hand the lever 34 is operated as previously described. If the cable breaks, current through the magnet will be interrupted and the springs 62 will come into action thus causing the levers 50 to move the members 44 out-ward and this in turn operates the levers 42, thus releasing the clutch member and permitting the action of the spring 39. In like manner, if the elevator runs away, the levers 57 operate to move said part 44 outward and cause the release of the clutch member. In any event this immediately throws into action the cylinders 18 and the car is thus pneumatically checked in its descent.

There has thus been provided a simple and efficient device of the kind described,

and for the purpose specified.

Having thus described the invention, what is claimed as new, is:

1. In a safety apparatus for elevator cars, an elevator car, a well, rack bars extending fromtop to bottom of the elevator Well on each side thereof, a shaft mounted on the bottom of said elevator car, a toothed wheel on each side of said elevator car meshing with a rack bar and normally out of engagement with said shaft, an air cylinder and piston operatively connected with said shaft, mechanisms for connecting the shaft at each side of the elevator car in operative engagement with said toothed wheel, a hoisting cable, and an electromagnet electrically connected with the hoisting cable of the elevator car and arranged when energized to hold said mechanisms out of operation and said toothed wheel out of operative engagement with said shaft.

2. In a safety apparatus for elevator oars, an elevator shaft, a rack bar extending from top to bottom of the shaft on each side thereof, an elevator car movable in said shaft, a hoisting cable connected to said car, a crank shaft extending across said car, a sleeve revoluble on said crank shaft at each end thereof, a gear carried by said sleeve, a clutch member carried by the sleeve, a second sleeve splined upon said shaft at each end thereof, a clutch member splined upon the second sleeve and adapted to engage the first mentioned clutch member at each end of the shaft, means normally holding the second clutch members out of engagement with the first clutch members, releasing devices for the last-mentioned means, springs constantly urging said releasing devices into operation, an electric circuit including the hoisting cable, and an electromagnet in said circuit and arranged to hold the releasing devices out of action.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

BERTHA 'BAUHER.

Vitnesses: V

ALBERT B. BEELAND, WM. J. FRANKLIN.

In testimony whereof I hereunto aflix my signature in presence of two witnesses.

CLARENCE E. BAJUMER.

l/Vitnesses HELEN HAMILTON, CHAS. F. FAUs'r.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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