US829094A - Safety device for elevators. - Google Patents

Description

No. 829,094. PATENTED AUG. 21, 1906.

0. E. BROWN. v SAFETY DEVICE FOR ELEVATORS.

APPLIOA TION FILED O0T.l2. 1905.

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Attorneys 1n: NORRIS FEYIRS co. wnsmucmrv. 04 c.

PATENTED AUG. 21, 1906.

G. E. BROWN. SAFETY DEVICE FOR ELEVATDRS.

APPLICATION FILED OCT. 12. 1905.

2 SEEETS SHEET 2.

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SAFETY DEVICE FOR ELEVATORS.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed October 12, 1905. Serial No. 282.486.

To aZZ whom it may concern.-

Be it known that 1, CHARLES EDGAR BROWN, a citizen of the United States, residing at Parsons, in the county of Luzerne and State of Pennsylvania, have invented a new and useful Safety Device for Elevators, of which the following is a specification.

This invention relates to safety devices for elevators, and has for its principal object to prevent damage to the cage or car and injury to the passengers from overwinding of the hoisting-cable.

A further object of the invention is to provide a cage or car so arranged as to be automatically disconnected from the hoisting means when raised to a predetermined point, and, further, to provide means for automatically engaging and holding the cage after such disconnection.

A still further object of the invention is to provide means for stopping the downward movement of the cage in the event of breakage of the hoisting-cable or disconnection of the cage and its hoisting means.

With these and other objects in view, as will more fully hereinafterappear, the invention consists in certain novel features of construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is an elevation of a cage or car arranged and constructed in accordance with the invention, showing the cage approaching the top of the shaft, portions of the shaft-timbering being illustrated in section. Fig. 2 is a similar view showing the manner in which the cage proper s disconnected from the hoisting mechanism when the limit of upward movement is reached. Fig. 3 is a detail perspective view of a portion of the mechanism arranged at the to of thecage for effecting the disconnection o the hoisting devices and for clutching or locking the cage to the guidingsills.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

The vertical guide sills or timbers 10 of the shaft may be of the ordinary construction and arranged to receive the channel guidebars 11, carried by the sides of the cage 12.

The cage or car may be of any desired construction employed for raising and lowering loads in mines or buildings and in the present instance includes a platform 13, an upper frame 1 1, and suspension-bars 15, connecting the two. To the upper end of the suspension-bars are pivoted levers 16, the outer end of each lever being bifurcated in order to partly embrace one of the guiding-sills 10, and pivoted to the outer end of this lever is a link 17, having side flanges 18 arranged for the reception of a cross-bar 19, each end of the cross-bar being bifurcated to form a pair of arms 20, that embrace the guide-sill 10, and to the centralportion of this cross-bar is connected the hoisting-cable 21, the chains 22, commonly used on mine-cages, being also shown as connected to this bar. So long as the links 17 are held from spreading movement by the vertical guide-sills 10 the ends of the bar '19 will remain in engagement therewith, and any lateral disconnection is prevented by the arms 20 of said bar, so that the cage may be raised and lowered in the usual manner. The inner ends of the levers 16 are pressed upward by helical compression-springs 24, and said levers are connected by links 25 to the shorter arms of hellcrank levers 26, that are pivoted on studs 27 in the outer frame 14 of the cage. The longer arms of the bell-crank levers have terminal teeth which may be pressed into engagement with the inner faces of the guide-sills 10 and check downward movement of the cage in case of accidental breakage of the hoistingcable.

' At the top of the shaft is arranged a cross bar or frame 29, that carries stationary cambars 30, that are disposed immediately above the outturned end portions 3 1 of the guide-sills, and these cam-bars are disposed in the path of movement of pins or lugs 32, that project from the link 17, and as the'cage approaches the limit of its upward movement the pins may be brought into engagement with the cam-bars 30, and this occurs only when the engineer winds the main hoisting-cable too far. l/Vhen this occurs, the pins or lugs engage with the cam-bars and are deflected outward, moving the links 17 outward and away from the ends of the bar19, so that the cable in continuing its upward movement will carry With it the cross-bar 19, leaving the cage or car so that the latter cannot be carr1ed over the top guiding-sheave.

the springs 24 act to throw the inner ends of the levers 16 upward, and this movement is transmitted through the links 25 to the bell crank levers 26, the longer arms of said levers being thus thrown outward until the pointed ends engage the guide-sills and positively stop downward movement of the cage. The automatic locking-levers 26 are also brought into play in case of accidental breakage of the cable during ordinary hoisting or lowering operations but as an additional precaution means are employed for preventing return. movement of the car after it has been raised above a predetermined. point.

To the guiding-sills or other portions of the shaft-timbering are secured plates or frames 35, having guide-boxes 36 for the reception of slidable bolts 37, which may be moved from the position. shown in Fig. 1 to the position. shown in Fig. 2, and in the latter case the inner ends of the bolts are projected under the car and lock the same from downward movement. The plates are further provided with slides 38 and cam-bars 39, that are connected to the locking-bolts 37 by levers 40. T he cam-bars 39 have tapered endfportions that are arranged to be engaged by cam-lugs 42, projecting from the-extended lower ends of the suspension-bars 15, and the parts are so proportioned that when. the cage or car is raised above a predetermined. point and the bar 19 is about to be disconnected the lugs 42 will engage the cam-bars 39, forcing the same outward. and effecting inward movement of the locking-bolts to a position below the bottom of the car, so that after the cross-bar 19 has been disconnected the car can fall but a short-distance and will be stopped by engagement with the bolts.

With a device constructed in accordance with this invention the serious accidents due to overwinding will be entirely prevented and the cage will be locked from downward movement in case of disconnection of the hoisting means or breakage of the cable at any point.

Having thus described the invention, what is claimed is As soon as the upward stress on the link 17 is relieved" 1. The combination with an elevator cage or car, of a hoistingcable, .a cross-bar connected thereto, a pair of links carried by the bar and arranged to engage the cross-bar, and cams disposed in the path of movement of the links and adapted to move the latter from engagement with the cross-bar.

2. .The combination with an elevator cage or car, of a hoisting-cable, a cross-bar connected thereto, a pair of links pivoted to the car and arranged for the reception of the ends of the cross-bar, pins or lugs projecting from said links, and. stationary cams for engaging said pins or lugs and moving the lugs from engagement with the crossbar.

The combination with an elevator cage or car, of a hoisting-cable, a cross-bar carried thereby and having arms at its opposite ends for embracing the vertical guide-sills of the shaft, links pivoted to the car and having openings for the passage of said arms, and means arranged at the top of the sills for moving the links outward from engagement with the cross-bar.

4. The combination with an elevator cage or car, of a hoisting-cable, a cross-bar carried thereby and providedwith arms at its opposite ends for embracing the guidesills of the shaft, links pivoted to the car and having side flanges fitting on either side of the sills, said links being arranged to receive the ends of the cross-bars, pins or lugs carried by the links, and stationary cams for engaging said pins or lugs and moving the links from engagement with the cross-bar.

5. The combination with an elevator cage or car, of a lever pivoted near the upper portion of the car, a hoisting member, a link connecting one end of the lever to the hoisting member, a spring tending to elevate the opposite end of said lever, a sill-engaging tooth pivoted to the frame of the car, and a link connecting said tooth to the'lever.

In testimony that I claim the foregoing as my own I have hereto aliiXed my signature in the presence of two witnesses.

CHARLES EDGAR BROWN.

Witnesses:

EDWARD N. NoLL, IsAAo S. VAN SEAY.

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