US1005837A

US1005837A - Safety-stop for elevators.

Info

Publication number: US1005837A
Application number: US60779911A
Authority: US
Inventors: John Hoffer
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-02-10
Filing date: 1911-02-10
Publication date: 1911-10-17
Anticipated expiration: 1928-10-17

Description

J. HOPPER.

SAFETY STOP FOR ELEVATORS.

APPLICATION nun-r2340, 1911.

Patented Oct. 17, 1911.

. 1 n 2 a m m m v 0 N W. 1 u 1 a F 4 /5 m 1 A r 2 z W v 4 Y M M r \MITN ESSESI in atBaxter, in the county of vator's,.of which improvements the followlend itself to serious ,JOHN HOPPER, 0F BAXTEB, VIEST VIRGINIA.

v SAFETY-STOP FOR 'ELEVATQRS.

Specification of Letters Patent. Application filed February '10, 1911. Serial No. 607,799.

To all whom {it may concern:

to like parts.

Be" it known that I, JOHN Horrnn, resid- Marion and b The elevator car shown herein conven- State of West Virginia, a subject of the iently consists of two major parts, a plat- Emperor of Austria-Hungary, have inform and a frame, which parts move simulvented or discovered certain new and usetaneously in the normal operation of the ful Improvements in Safety-Stops for Elecar, but are movable with reference to each other in case an accident causes the cable to slacken. Of these parts, the platform 1 is conveniently provided with sides 2. Vertical sustaining

members

3, 3 are secure to each side, and, at their upper ends, the said sustaining members are yoked together by a suitable block a, which may be suspended from the cable 5 by a bolt 6. block 4 is inclosed loosely Within the upper portion of the frame, which upper portion conveniently consists of a horizontal channel 7 and vertical plates 8. To the said plates 8 I secure guide blocks, suitable in form and in construction, to the particular type of guideposts used. As usually constructed the guide-posts 9 are made of wood and are rectangular in cross-section. The guideblocks for such guide-posts I preferably make of pairs of

angles

10 and 10, suitably secured to the vertical plates 8, as by lug angles 11, and I arrange the blocks one on each side of a guide post. To each angle 10 I suit-ably secure an adjusting-bar 12, to the end that, as the guide blocks wear away, not only the loose play may be taken up, but also a slight frictional contact may be maintained. Preferably, the said adjusting-bars 12 are made of steel flats, suitably provided with smooth holes, which extend partly through'the flats, and into which the screw-threaded bolts 13 extend. It will be understood that the angles 10 have screw-threaded holes, which register with the smooth holes of the adjusting-bars, and that a turning of thebolts 13 may be effective to move the adjusting-bars away from the angles 10, thereby diminishing the width of the passageways for the guideposts.

The pair of guide blocks 10 and 10 may be connected to each other at their lower ends, as by plates 14:, suitably provided with bearings for the

rotatable shafts

15 and 15, on which shafts I secure indented camshaped blocks 16, preferably placing one on each. end of each shaft. The shafts are suiting is a specification.

Elevator-cars that are used primarily for handling articles of commerce, for example such as operate in mining shafts, usually consist of a platform, either rigidly or movably sustained within a frame, which frame is guided by vertical posts in the movement up and down the shaft. To the end that the car may not fall, in case the cable breaks when the car is in elevated position, the car has been provided with suitable cam-shaped blocks, with indented surfaces, to engage the guide-posts as soon as the cable becomes slack,'due to its rupture or any other cause. As heretofore constructed, cam-blocks of the character described have been operated by springs. In the operation of such elevators, the guide-posts, which are usually made of Wood, become worn, and thereby considerable play is allowed between the posts and the guide-blocks of the frame of the car, which play is of itself undesirable in the normal operation of the elevator and may consequences by permitting the cam-blocks to turn over completely in case the cable should break.

My invention relates to improvements in elevators of the character described and the object of my invention is to provide a compensation for the wearing of the guide-post and in so doing to wprovide a safety device for elevator cars that willnot be dependent upon the uncertain action of a spring.

While my invention finds application in any elevator wherein the above conditions arise I choose to describe it in its application to an elevator of the type usually used in a mine shaft.

In the accompanying drawing, which forms part of this specification, Figure 1 is an elevation of a freight elevator embodying my invention; Fig. 2 is a side view 0 the same; and Fig. 3 is a sectional view taken on the line III-III, Fig. 2.

the several figures like numerals refer The said Patented oer. 17,1911.

ably connected, as by levers and links, to the. platform, to the end that, when the elevator is running normally, the indented cams 16 will be held away from engagement with the guide-posts, but that, 'when the platform has moved downward a little in advance of the frame (as it will, should the rope 5 break) the said cams will be brought into engagement with the guide-posts, and will thereby stop the cars descent, in a manner that is well known by those skilled in the art. 7

That the plat-form will drop in advance of the frame, in case the cable should break or slacken, will be understood from the fact that the guide-blocks are adjusted to constantly have a frictional engagement with the guide-posts, which frictional engagement will retard the descent of the frame sufficiently to allow the platform to fall in advance of the frame and thereby bring the car to a stand-still as heretofore explained. It will be observed of my invention that a safety stop is accomplished without employing a spring, the reliability of which has been found by experience to be uncertain. Furthermore, it will be understood that the operation of one of the

shafts

15 or 15 with its cam-block 16, will be suflicient'to stop the car, and it will be observed that the shaft l5 with the cams 16, being arranged to engage the posts 9 on the sides opposite the ad'- justing-bars 12, will remain, whatever he the degree of adjustment, in fixed relative position to the said guide-posts, so that it will be impossible for the said cams to turn completely over in consequence of the wearing away of the substance of the posts, and thereby permit the car to drop, an occurrence that would remain possible in case the adjustment were taken up equally on each side of the posts or in case the adjustments were not taken up at all.

I do not wish to limit myself to the details of construction shown and described morass? herein, for obviously-many changes may be made by those skilled in the artwithout departing from the spirit of my invention.

I claim as my invention:

1. In an elevator, the combination of guide posts and a car, said car consisting of a frame and a platform, which members move in unison in the normal operation of the car, but which may move relatively to each other when the car is unsupported, a

safety-cam rotatably secured to one of said car-members and having operative connection to the other of said car-members, an adjusting bar secured to the safety-camcarrying car-member and maintaining constant friction with the elevator guides during the operation of the car, said bar being operative (in case the car-supporting meniber gives away) to retard the downward movement of the safety-cam-carrying earmember relative to the said other car-memher, said relative downward movements of the car members being operative to set the said safety cams, substantially as described.

2. In an elevator, the combination of guide-posts and a car, said car comprising asuspended platform and a frame movably sustained by said platform, said frame pro vided with adjustable passageways main taining constant friction with said guideposts, a shaft rotatably secured to said frame and provided with a safety-cam,

an arm rigidly secured to said shaft and having linked connection to said platform, said friction passageways being operative l to retard the downward movement of the I frame to accomplish a setting of the safetycams 111 case of accident to the car-supporting member, substantially as described.

In testimony whereof I have hereunto set my hand.

JOHN HOFFER. Witnesses F. Monorrnr, E. WV. GRIFFITH.