US1669075A - Retiring cam - Google Patents

Description

May 8, 1928.

T. BRADY RETIRING CAM Filed April 1, 1927 Patented May 8, 1928.

are

PATET THOMAS BRADY, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO OTIS ELEVATOR COM- PANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

RETIRING CAM.

Application filed April 1, 1927. Serial No. 180,162.

This invention relates to retiring cams and particularly to retiring cams for use in elevator system One feature of the invention is to provide a retiring cam of the above character that occupies a minimum of space.

Another feature of the invention is the provision of a retiring cam of the above character that is of simple construction and easily-installed and operated.

Still another feature of the invention is to provide a retiring cam of the above character that is silent and positive in opera tion.

Other features and advantages will become apparent from the specification, taken in connection with the accompanying drawings wherein one embodiment of the invention is illustrated.

In the drawings Figurel illustrates the retiring cam of this invention applied to an elevator car;

Figure 2 is a view, with parts broken away, taken along the line 22 of Figure 1 and illustrates the retiring cam in its eX- tended position; and

Figure 3 is a View in side elevation of Figure 2.

- Referring to Figure 1, an elevator car 1 is positioned at a landing 9. A retiring cam motor is provided as an operating device for retiring the cam. This motor has an operating connection, shown as a chain 3, connected-to a retiring cam and extend ing from the shaft 4 of the motor 2 downwardly over sheave 5. 'The retiring cam 6 is arranged to actuate a' roller 7 carried by a switch lever 8 of a switch 19. The switch lever 8 is pivoted upon a support mounted in the hatchway..

According to the preferred arrangement, the retiring cam 6 comprises a plate 10 secured by screws 11 to the car 1. Plate 10 is provided near its upper end with a vertically extending slot 12. A rivet 13 extends through the slot 12 andthrough aligned apertures provided in the upper end of an angle bar 14 and in a swivel plate 15. The angle bar 14 and the swivel plate 15 are free to pivot upon the rivet 13. The lower end of the angle bar 14 is connected by a hinge 16 to the upper end of a vertically extending angle bar 17. The lower end of angle bar 17 is connected by a hinge 18 to the upper end of an angle bar 20. The lower end of angle bar 20 is pivotally mounted up on a rivet 21 that extends through apertures provided in the angle bar 20 and in plate 10. Angle bars 14, 17 and 20 constitute the rail of the retiring cam 6.

The upper end of the swivel plate is connected by a swivel 24 to the chain 3. The lower end of the swivel plate 15 is connected to one end of a tension spring 22. The other end of tension spring 22 isconnected to'a spring anchor that is socured to the plate 10.

The operation of the retiring cam is as follows:

Assume that the car is at a landing as illustrated in Figure 1 with the retiring cam motor 2 energized. The motor 2, acting through the chain 3, holds the retiring cam 6 in its retracted position against the tension of spring 22. To cause the retiring cam to operate the switch 19 the retiring cam motor is deenergized, permitting the tension spring 22 to unwind the chain' 3 from the motor shaft 4. As the chain 3 unwinds from the motor shaft, the swivel plate 15 moves downwardly under the ac tion of spring 22. The rivet 13, sliding in the slot 12, moves along with the swivel plate 15 and causes the upper end of the angle bar 14 to move also. The lower end of angle bar 14 is thus caused to move downwardly and outwardly. This movement of the lower end of angle bar 14 causes angle bar 17 to move outwardly and strike the roller 7 of the switch 19. Angle bar 20 also swings outwardly, turning about the rivet 21. Continued movement of the parts results in the operation of the switch 19. 1V hen the rivet 13 strikes the bottom of the slot 12, the moving parts of the retiring cam are brought to rest, the cam being 1n its extended position as illustrated in Figure 3. To assure that angle bar 17 is substantially vertical when the cam is extended the angular motion between angle bar 17 and angle bars 14 and 20 is limited. This is accomplished by forming the ends of angle bars 14 and adjacent angle bar 17 so that they abut the ends of this angle bar at and 26 when the cam is extended. In the same manner the angle bar 17 isheld substantially verticalwhen the cam is retired by theabutting of this angle bar with the other angle bars at the points 27 and 28.

To retire'tli'e 'cani', the motor 2 is again energized causing the chain to be wound upon the motor shaft 4. The motion of chain 3 causes the swivel plate 15 to move upwardly against the force-of spring 22; The motion of swivel plate 15 is transmit-ted through the rivet 13 to the several parts of the (2111i railand causes these parts to move intothe positions illustrated in Figure 1. The moving parts of the retiring cam are brought to rest by the rivet 1'3 striking the upper end oi the slot- :2;

It isit o be noted that the retiring cam is very compact and. occup'es but little hatchway space, thereby permitting the clearance between the car and hatchway to be reduced to a minimum.

The retiring. cam may be moved to its extended position by HIGZHLS oi? a weight instead of by means of the tension spring Thus, a weight may be substituted for this spring or the parts of the cam rail may be designed so as to cause the extension of the cam by their own weight.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention couldbe made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I'Vhat is claimed is- 1. In a retiring cam, a cam rail comprising, a vertically. extending first portion, a secondportionhinged at one end to said ver tically extending portion, and a third portion hinged at one end to the other end of the vertically extending portion, said portions being consrncted and arranged to limit the angular movement of the second and thirdportions with respect to the first portion.

2. In a retiring cam; a support; a cam rail comprising, a. vertically extending first portion, a second portion hinged at one end to said vertically extei'iding portion and pivoted at its other end to said support, and a third portion hinged at one end to the otherend of the vertically extending portion and slidably as well as pivotally connected at its. other end to said support, said portions. being constructed and arranged to limitthe angular movement of the second and third portions with respect to the first portion.

3. A retiring cam comprising, a plate, a

cam rail pivotally connected at one end to said plate and slidably connected at its other end to said plate, and means for biasing the cam rail to its extended position, said cam rail being arranged to turn about its-pivotal connection with the plate and to slide at its slidable connection with the plate in moving from its extended to its retired position.

t. A retiring cam comprising, a plate, a

cam rail having a plurality of sections hinged together, a section of said cam rail bei-n pivota-lly connected to said plate and a-not ier section ofsaid cam rail being slidably connected to said plate, and means, acting upon thesecond named section of said cam rail, tending to hold the cam rail. in its extended position said cam rail being arranged so that the first named section turns about its pivotal connection with the plate and said second named section slides at its connection with said plate during themovement of the cam rail from its extended to its retired position. I

5. In a retiring cam; a plate; a cam rail comprising, a plurality oi sectionshinged together, a section of said cam rail being pivotally connected to said plate and another section of said cam rail being slidably con nected to said plate; and a tension spring connected at one end to said plate and at its other end to said second named section. of the cam rail, said spring biasin said ca'm rail to its extended position, and resisting the motion of the cam rail to its retired position.

6. In a retiring cam; a plate, a rivetextending through an aperture in said plate; another rivet extending through a slot in said plate; and a cam rail, said cam rail comprising, a vertically extending portion and two portions hinged to said vertically extending portion, one of said hinged portions being pivotally mounted on said first named rivet, and the other of said hinged portions being pivotally mounted on said second named rivet.

7. In a retiring cam; a plate, a rivet extending through an aperture in said plate; another rivet extending through a slot in saidplate; and a cam rail, said cam rail comprising, a vertically extendingportion and two portions hinged to said vertically extending portion, one of said hinged portions being pivotally mounted on said first named rivet, and the other of said hinged portions being pivotally mounted on said second named rivet, said second named rivet being positioned at one end of the slot in said plate while the cam rail is in its extended. position and positioned at the other end of said slot while the cam rail is in its retired position. 7

8. In a retiring cam; a-plate; a rivet extending through an aperture in said plate; another rivet extending through a slot in said plate; a cam rail, said cam rail comprising, a vertically extending portion and two portions hinged to said vertically extending portion, one of said hinged portions being pivotally mounted on said first named rivet, and the other of said hinged portions being pivotally mounted on said second named rivet; and spring means tending to hold said second named rivet at one end of the slot in said plate, thereby holding said cam rail in its extended position, said second named rivet being arranged to move to the other end of the slot during the movement of the cam rail from its extended to its retired position. I

In testimony whereof I have signed my name to this specification.

THOMAS BRADY.

Images