US1542519A

US1542519A - Friction safety stop

Info

Publication number: US1542519A
Application number: US728722A
Authority: US
Inventors: Oral F Rainbolt
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-07-28
Filing date: 1924-07-28
Publication date: 1925-06-16
Anticipated expiration: 1942-06-16

Description

June 16, ,1925. 1,542,519

O.F.RMNBOLT FRICTION SAFETY STOP Filed July 28, 1924 2 Sheets-Sheet i b d 27 42 6 i3 6 A 25 l I 6 33 ,{17 20 4 A 5 g i v amounts a H 21 22 OPaLEKainhobb June 16,1925. 1,542,519

O. F. RAINBOLT FRI CTI ON SAFETY STOP Filed July 28, 192A 2 Sheets-fine 2 Swuemtoz 6 OraLEKaZnhalb Patented June 16, 1925.

' UNITED STATES ORAL F. RAINBOLT, OF LYONS, INDIANA.

rnror'ron SAFETY s'ror.

Application fil ed July 28, 19241 Serial No. 728,722.

To all whom it may concern:

Be it known that I, ORAL F. RAINBOLT, a citizen of the United States, residing at Lyons, in the county of Greene and State of Indiana, have invented a new and useful Friction Safety Stop, of whichthe following is a specification. The present invention relates to safety devices for elevators, lifts, or the like and aims to provide novel means whereby the elevator or lift equipped with the safety device'will be automatically stopped in its downward movement to insure against injury to per sons riding thereon.

An important object of the invention isto provide a device of this character which will operate to gradually retard the movement of the elevator lift, prior to its'stopping, thereby eliminating the sudden jar incident to an elevator or lift stopping abruptly.

A still further object of the invention is the provision of a device of thischaracter which will be readily and easily installed on elevators or lifts now in use, eliminating the necessity of makingalterations in the elevator orlift construction to apply the device.

With the foregoing and other objects in view which will appearas the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention. Referring to the drawings:

Figure 1 is an elevational view disclosing a safety device constructed in accordance with the invention as mounted on| an elevator.

Figure 2 is a plan view thereof.

Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Figure 1 is a sectional view taken 4-4: of Figure. 1.

Figure 5 is a sectional view taken on line 55 of Figure 2.

Figure 6 is a sectional View taken on line 66 of Figure 2.

Referring to the drawings in detail, the reference character 5 guides which are engaged by the arms 6 car ried by the elevator frame tosupportthe elevator against lateral movement.

The reference character 7 indicates the on line designates spaced upper beam of the elevator frame and the reference character 8 indicates vertical side bars which have their upper ends secured to the beam 7 and braced against movement, by 7 means of the brace members Q arranged adjacent to the upper ends of the bars 8. As

beam 7, the opposite end thereof operating in the bearing 15 which is mounted on the sliding plate 16 that moves in the guideways 17 positioned on theplate 18 that in turn is mounted on the beam 7.

Threads 19 are formed on the shaft 13 adjacent to one side thereof, while the threads 20 which are disposed inthe opposite direction, are arranged on the shaft 13 at the opposite side thereof for purposes to be hereinafter more fully described.

Operating through the bearing 15 and positioned on the shaft 13 is a sleeve 21 that carries the beveled pinion 22, which pinion issecured in position on the sleeve at 21 by means of the set screw 23 and as clearly shown by Figure 6 of the drawings, the sleeve is formed with a squaredopening to be fitted over the squared extremity 24 of the shaft 18 so that the sleeve may be free to move longitudinally of the shaft 13 and at the same time receive rotary motion therefrom which in turn is imparted to the pinion 22. 1

- The pinion 22 is in mesh with the beveled pinion 25 which is mounted on the shaft 26 that has one end thereof positioned in the socket 27 of the bearing member 15, the opposite end of the shaft 26 being mounted in the bearing 28 carried at the upper end of the arm 29 that is also secured to the sliding plate 16 to the end that when the pinion 22 is moved longitudinally of the shaft, the beveled pinion 25 is also moved in a direction longitudinally of the shaft 13.

Teeth 29 are formed on the periphery of the pinion 25 and are designed to cooperate with the teeth 30 provided on the inner edge grooved member 31 in which, the forked end of the arm 32 moves, which arm 32 has an extension 33 that is connected to the cable 10 at 34, the extension 33 being acted on by the coiled spring 35 that has one end thereof anchored to the plate 18 by means of the eye bolt 36. Thus it will be seenthat due to the connection between the eXtension33 and cable 10, the

pinions

22 and 25 will be normally held in their inactive positions but when the cable breaks under excessive weight, the coiled spring will act to move the, extension 33 downwardly and causing the

pinions

22 and 25 to move outwardly or towards the guide 5, the teeth of the pinion 25 meshing with the teeth 30. of the guide 5 with the result that rotary movement is transmitted to the shaft 13 through the

pinions

25 and 22.

A latch member indicated at 37 lies in the path of travel of the extension 33, on its downward movement and engages ,the extension 33 to hold the same'to its active position after it has been moved downward- 1y by the spring 35. The reference character 38 indicates gripping members which are pivotally mounted at the outer ends of the arms 39 that have cam surfaces 40 which are engaged by the rollers 41 carried on the arms 42 that have their lower ends pivotally connected to the arms 43 that are secured to the beams 8 of the elevator frame.

The upper ends of the arms 42 carry threaded eyes 44 that are-mounted on the threaded

portions

19 and 20 respectively of the shaft 13 so that as the shaft 13 is rotated, the upper ends of the arms 42 will be moved towards each other, to the end that the rollers 41 are moved towards each other over the cam surfaces 40 causing the outer ends of the arms 39 which carry the gripping members 38 to move towards each other, grippingthe guides 5 associated therewith.

The arms 39- are pivotally connected at 42 so that movement of the inner ends of the arms 39 will produce a relative movement of the opposite ends of the arms 39, inthe opposite directions.

These arms 39 are supported by the links 43 that have connection therewith through the'eye bolt 44, the upper ends of thelinks 43 being connected to the eye beam 7, by means of the bolts 45. Coiled springs 46 connect the inner ends of the arms 39 to normally urge the arms towards each other, at their inner ends.

It is believed that in view of the foregoing, the operation of the device will be clear and that a furtherdetail description as to the operation of the device is unnecessary, however it might be statedthat after the gripping members have been operated to accomplish the purpose of the invention, the lever 46 which has connection with the shaft 13 may be operated over the ratchet wheel 47 to rotate the shaft 13 in the opposite direction to release the pinion 25 and cause it to disengage the teeth of the guide 5.

I claim 1. An automatically operated stop device for an elevator operating between toothed guides and having a lifting cable including a shaft, pinions slidably mounted on the shaft, a pivoted arm having connection with one of the pinions to move the pinions to their active positions, said arm having connection with the cable to normally hold the arm in its inactive position, a spring for moving the arm to its active position, and means controlled by the movements of the shaft for gripping the guides to retard movement of the elevator.

2. An automatically operated stop device for an elevator operating between toothed guides and having a lifting cable, pinions slidably mounted on the shaft, said shaft having oppositely disposed threads, means for moving the pinions into engagement with the teeth of the guides when the cable breaks,arms having threaded eyes operating on the threaded portions of the shaft, and gripping members adapted to be moved into engagement with the guides when the arms are moved over the threaded portions of the shaft.

3. An automatically operated stop device vfor an elevator operating between guides, a shaft carried by the elevator, means at one end of the shaft and adapted to be thrown into engagement with one of the guides for rotating the shaft, arms pivotally mounted ,on the elevator and carrying gripping members at their outer ends, said arms having cam surfaces, pivoted arms having their lower ends disposed between the cam surfaces of the first mentioned arms, to move .the arms and cause the gripping members to grip the guides, and said last mentioned arms having eyes removable on the shaft to cause the arms to move when the shaft is rotated.

4. An automatically operated stop device for an elevator operating between guides, and having an elevating cable, a shaft car ried by the elevator, means at one end of the shaft and adapted to be automatically moved into engagement with one of the guides to cause the shaft to rotate, arms pivotally mounted on the elevator, grippingmembers on the outer ends of the arms and means operating between the arms and mounted on the shaft to move longitudinally thereof for moving the arms and causing thegripping members to grip the guides.

5. An automatically operated stop device for an elevator operating between guides, and having an elevating cable, a shaft mounted on the elevator, said shaft having threaded portions, a shaft operating member,

member slidable on the shaft and adapted arms to cause the gripping members to grip to be moved into engagement With one of the the guides. guides for imparting rotary movement to In testimony that I claim the foregoing the shaft, means having connection with the as my own, I have hereto aflixed my Sig 5 cable for moving the shaft operating memnature in the presence of tWo Witnesses.

her to its active ositions, arms carrying gripping members pivotally supported by ORAL RAINBOLI the elevator, and arms having threaded Witnesses:

ortions moving over the threaded portions WEBSTER V. MOFFETT, 10 of the shaft for moving the first mentioned THEO. S. RAINBOLT.