US1391575A - Safety-stop for elevators - Google Patents

Description

A. OPRISAK AND J. PROKOPOWICZI SAFETY STOP FOR ELEVATORS.

APPLICATION FILED FB.26,1919.

1,391,575, PatentedSept. 20,1921.

2 SHEETSSHEET l.

Andrew Elpm'saK I an 2% John Prnknpuwmz mw Momm I A. OPRISAK AND J. PROKOPOWICZ.

SAFETY STOP FOR ELEVATORS.

' APPLICATKON FILED rmze, 1919.

PatntedSept. 20,1921.

2 SHEETSSHEET 2;

7 Mm Z M, M y W fly NIH- AM 7 M 0 1 w? 7 E... p Wm I J 5. i mx A z V r w 6 M Andrew Elpria J uhn P R P UNITED- STATES ANDREW OPRIS.AK AND JOHN PROKOPOWICZ, OF DETROIT, MICHIGAN.

SAFETY-STOP FOR ELEVATORS.

Application filed February 26, 1 919.

To all whom it may concern:

Be it known that we, ANDREW OPRISAK and JOHN PnoKoPowIoz, citizens of Austria and Poland, respectively, and residents. of Detroit, in the county of WVayne and State of Michigan, have invented certain new and useful Improvements in Safety-Stops for Elevators, of which the following is a specification.

This invention relates; to a stop mechanism adapted for application to elevatorssuch as are used in mines, factories, and buildings, and an object of the invention is to provide a safety stop for elevators which will automatically arrest the movement of the elevator in case the operatingrope or mechanism breaks or becomes inoperative, preventing the dropping of the elevator cage and consequently preventing serious injury to persons in the elevator or mutilation of the elevator itself.

Morespecifically, the object of the invention is to provide toothed standards at each side of the elevator cage, which are adapted to be engaged by locking pawls pivotally carried by the elevator cage and normally held in inoperative position, but which are moved into operative positions upon a sudden dropping of the elevator cage for engagement with the vertical racks to arrest falling movement of the elevator.

Other objects of the invention will appear in the following detailed description taken in connection with the accompanying drawings, forming a part of this specifica tion and in which drawings:

Figure 1 is a fragmentary side elevation of an elevator cage showing the improved safety stop mechanism applied thereto.

Fig. 2 is a horizontal section taken on the line 2-2 of Fig. 1.

Fig. 3 is a fragmentary side elevation of an elevator cage showing the stop applied thereto, the said stop mechanism being in a movement arresting position of the elevator cage while one of the racks is shown in section. 7

Fig. 4 is a fragmentary view similar to Fig. 3, only showing the locking pawls in their normal or inoperative position.

Referring more particularly to the drawings, wherein like characters indicate like and corresponding parts throughout the several views, 1 indicates an elevator cage of any ordinary type, which is guided, in its vertical movement by the engagement of Specification of Letters Patent.

Patented Sept. 20, 1921.

Serial No. 279,469.

the recesses in the end of the top bar 2 over the vertical guiding rails 3. In the drawings, the elevator cage 1 is operated by a suitable cable 4 which is connected to a link 5. The link 5 extends slidably through the top bar 2 and extends through a lower bar 6, being connected to the said bar; thus during the proper or ordinary movement of the elevator, the bar .6 will be moved upwardly toward the top cross bar 2, being limited in its upward movement by suitable stops 7 which are carried by the upper cross bar 2. Suitable guiding rods 8 are carried by the top cross bar 2 and extend slidably through the lower bar 6. Spiral springs 9 are coiled about the guide pins 8 and have their upper ends engaging against the undersurface of the upper cross bar 2, while their lower ends engage the upper surface of the lower. cross bar 6, the said springs tending to expand and force the lower bar 6 away from the upper bar 2.

Vertical rack bars 10 and 11 are positioned upon opposite sides of the elevator 'cage'l, being attached, in any suitable manner, to the guide rails 3, and these rack bars have teeth 12 upon each of their sides whichare adapted tobe engaged by the teeth of pawls 13, 14, 15 and 16 to arrest downward movement of the elevator cage. The pawls Band 14, a pair of each of which are provided are pivotally carried by suitable pins 17 at the upper ends of the elevator cage and each of the pawls 13 is connected by a bar, 18 to the respective pawl of the lower pair 15 to operate them synchronously to move their toothed inner edges into engagement with the teeth 12 of the rack bar 10 to arrest the downward movement of the elevator. Each of the pawls 14 is connected by means of a bar 19 to the corresponding pawl 16 of the lower pair of pawls. These lower pairs of pawls 15 and 16 are pivotally mounted upon suitable pins 19 and 20, carried by blocks 21. The blocks 21 are attached in any suitable manner beneath the bottom of the elevator cage 1. Contractile springs 22 are connected to each of the pawls and to a part of the elevator cage for quickly snapping the pawls into locking engagement with the rack teeth 12 should the elevator cable 4 break or any controlling part of the elevator mechanism become inoperative, causing a slacking of the cable 4.

Yokes 24 and 2,5 are connected to the upper cross bar 6 and they have the upper ends of their arms angled to provide outwardly extending arms 26 which engageover the upper cross pieces 27 of the elevator cage structure. The arms 26 have eyes 28 formed upon their free ends to which links 29 are connected. The links 29 which are connected to the arms 26 of the yokes 24 are connected to the upper pair of pawls 13 while the links 29 which are connected to the arms 26 of the yokes 25 are connected to the upper pair of pawls 14. In case the cable 4 breaks or any controlling part of the elevator mechanism becomes inoperative, so as 'to release the supporting action of the'cable 4, the springs 9 will act to move the bars '6 downwardly which'will, through the connection ofthe yokes 24 and 25'and links 29 rock the upper pairs of pawls 13 and '14; and consequently rock the lower pairs of pawls 15 and16 through the medium-of the'arms' orbars 18 and 19, to cause the teeth of the pawls to engage the teeth of the racks 10 and 11 and arrest downward movement of the elevator cage.

Changes in details may be made without departing fromthe spirit of this invention, but;

We claim 1.' In a safety stop for elevators, the combination, with an elevator cage, and the supporting means therefor, of a bar movably carried by the elevator cage and normally held in upward position by said supporting means, spring means for forcing said bar downwardly with respect to the cage, yokes carried by the bar adapted for engagement with the cage to limit the action of the spring means upon release of the supportin means, racks, pawls pivotally carried by the elevator cage, and means connecting said yokes and pawls to force the pawls into engagement with the racks upon release of the supporting means. i 7

2. In a safety stop for elevators, the combination, with an elevator cage, and the supporting means therefor, of a bar movably means, said outwardly extending arm provided with an aperture therein, racks, pawls pivotally carried by theelevator cage, and

links pivotally connected to the apertures of said yokes and connected at their other ends to the pawls, for the purpose of forcing the pawlsinto engagement withthe racks upon release of the supporting means.

3. In a safety stop for elevators, the combination with an elevator cage and the supportin means therefor, carried held in upward position by said supporting means, racks adjacent said elevator cage,

of a bar 'movably pawls pivotally carried by said elevator cage,

means connecting said movable bar and said pivoted pawls for normally holding said pivoted pawls out ofengagement with said racks wh'ensaid movable bar is held in upward position by said supporting means,

and springs for each of said pawls, directly by the elevator cage and normally connecting said pawls to'said elevator cage for action to force said pawls into engagement with said rack upon release of said supporting means.

ANDREW OPRISAK. JOHN PROKOPOWICZ.

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