US1492222A - Hoisting mechanism - Google Patents

Description

Aprngg, 1924.l y 1 1,492,222

` W. M. RUTAN HQISTING MECHANI SM Filed April 19. 1923 2 Sheets-Sheet 1 April 29, 1924.

. 1,492,222 vw. M. RUTAN HoIsTING MECHANISM Filed April 19. 1923 2 snetsheet 2 Patented Apr. 29, 1924.

SFTES4 M2232 PATENT ENCE..

WILLIAM M. RUTAN, F ROOSEVELT, YORK, ASSIGNOR TO GILLIS n GEOGHEGAN,

' INC., OF NEW YORK, N. Y., A CORPORATION OF NEW' YORK.

HOISTING MECHANISM.

Application filed April 19, 1923. Serial No, 633,040.

To @ZZ whom t may concern.'

Be it known that I, WILLIAM M. RUTAN, a citizen of the United States, residing at Roosevelt, in the county of Nassau and State of New York, have invented a certain new and useful Improvement in Hoisting Mechanism, of which the following is a specification.

The invention relates to electrically operated hoisting machines and more especially to machines for raising ash-cans and like lightv loads from the cellar to the sidewalk. The present invention is based on the mechanism shown and described in Letters Patent to Joseph H. Donat for an improvement in hoisting mechanism, dated March 9, 1920, No. 1,333,064, in which the hoisting, lowering, and braking operations are all controlled by a single operating-lever swung to different positions.

The object of the invention is to provide means for automatically and positively controlling the brake by direct action through the operating-lever instead of relying upon the action of a spring to apply thebrake, thus eliminating the work required in overcoming the force of such spring in releasing the brake, and also avoiding the danger of accident dueto failure of such spring in a hoisting operation.

The invention consists in certain details of construction and arrangement by whichy the above objects are attained, to be hereinafter described and claimed.

The accompanying drawings forma part of this specification and show the invention as it has been carried out in practice.

Figure 1 is a side elevation of'a hoisting head and a portion of theelectric motor mounted thereon, partially in vertical section, and with portions of the frame broken away to show the parts beyond. Y

Figure 2 is a corresponding view of a portion of the opposite side of the head.

Figure 3 is a plan view of the brake-lever with its operating wing shown in horizontal The horizontally disposed frame of the hoisting head is marked 5 and is adapted to be mounted on'a standard, not shown, which may be understood to be as usual and equipped with means for elevating and lowering such head. In the frame is mounted the transversely extending hoisting shaft 6 having keyed thereon adjacent one of its bearings the hoisting drum 8 which is also keyed to a beveled gearwheel 42; a similar gearwheel 43 oppositely disposed has a sleeve 44 on which is keyed the brake-drum 7 adjacent the other bearing for the shaft 6. An annular wormwheel 48 encircles the shaft between the beveled gearwheels 42 and 43 and carries radial arms 45, only one of which is shown, on each of which is mounted a beveled pinion 46 in mesh with both the beveled gearwheels42 and 43, and the teeth of the wormwheel 48 mesh with the worm 9. The beveled gearwheels 42 and 43 with the pinions 46 form a differential gear and operate in the manner usual in such mechanism. The worm 9 is driven by the motor shaft 10 of an electric motor 23 in axial alinement therewith and equipped with a magnetic brake indicated at 47, of the usualc'onstruction, actuated by a switch, not shown, in a controller-box 22.

A brake lever 12 fulcrumed to the frame at 13 carries the brake-band 11 and is arranged to tighten theband and apply the brake by a depression of its free end, and to release the brake-drum by a lifting move ment of such free end.

Mounted in the frame is a transversely extending operating shaft 14 carrying on its overhungend the boss 15 of a depending operatinglever 16 by 4which the shaft 14 is oscillated. Between the boss 15 and ythe frame is a collar 17 loosely mounted on the shaft, lhaving a radially projecting arm 18 connected by a link 19 to a crank arm 2() on the controller shaft 21 extending into the controller box 22 and operating the electric switch therein to control the current to the motor 23 and its magnetic brake 47 as usual. The arm 18 carries a lug 24 in the path of the operating lever 16 when the latter is swung to the left in Figure 2, by which engagement the controller shaft 21 is partially turned to energize the motor and raise the load, and when released by a movement of the lever 16 to the right, is automatically returned to the' neutral position by the usual 14, within the frame, is fixeda boss hav- 1,- ing a radially disposed wing 26 thereon,

notched as at 27 to form fingers28.

rIlhe rear end of the brake lever 12 extendsV beneath the boss 25 and its wing 25 and is provided with a wide platform 29 curvedv on its upper face concentrically `to the axis'V of the operati-ng sh-aft 14 on an arc `described by the extremities ofthe fingers 28. At therear the platform is upturned to form a ledge 30 serving as a stop for the lingers in their sweep in that direction, and at the front the platform is Vcurved downwardly and forwardly as at 31 to lead the fingers smoothly to the concentric portion of the platform. f The part 31 overhangs a deep re# cess 32 in the leveriand is notched at 39 at the front. 1

The bottom of the recessl is formed by a boss 33 on'the lever, through' which extends aV screw 34 standing approximately vertically and provided with Vnuts 35 placed above and below the boss 33fby whichthe screw may be adjusted as to height rela-V tively to the lever. 'Ilhe screwextends through the notch 39 provided` for that p'urpose. At the upper end of the screwzis a cylindrical cross-bar 36- disposed transversely of the lever and havinga recta-1igular notch 37 on its front matchingandem gaged with a flanged way 38 on thelever, serving as a guide for the cross-bar and insuring its transverse relation' to the lever in all positions of vertical adjustment.

The cross-bar is arranged to be struckl bythe .fingers 28 and lifted by the latter, thus raising the free end of the lever and releasing the brake.

From the boss 15 of the operating lever- 16 extends a lateral arm 40 carrying anadjustable counterweight 41 serving to-fholdthe operating lever normally in contactv with the lug 24 and in the vertical or neutral' position in which the fingers 28 are en-V gaged with the platform 29v and the brake applied, The force exerted by thecounterweight is sufficient to effect such Contact of the lever with the lug but not great enough to overcome the resistance offeredby such lug due to the spring, not shown, in the controller box 22 acting upon the controller' shaft 21 in the usual manner.

The operation is as follows/: Assuming the parts to be in the positions shown in the figures, which is the neutral position, and a load to be hoisted, the operating' shaft 14 is oscillated by swinging the operatingy lever 16 to the left in Figure 2, carrying the arm 18 with it and through the link 19 and `crank arm 2O turningl the controller shaft 21 to supply current. The fingers 28 on the opposite end of the operating shaft by theirV contact with the platform 29 hold the brake lever 12 depressed and maintain the grip of the brake band 11 on the brake drum- 7. The latter with the beveledgearwheel 43 are thus held stationary and the rotation of the Worm 9 in turning the wormwheel 48 causes the pinions'46 to rotate and thus turn the beveled gearwheel 42 and hoisting drum 8 with the Vshaft 6 in the direction to wind the cable, not shown, and 1r vertical or neutral again, the current'broken,

and the magnetic brake 47 actuated, and asV the brake drum 7 isstill gripped the load will remain suspended.

In lowering the load the operating lever is swung to the right in Figure 2, away from the arm 118 which is left in the'neutral or inoperative position, and theV fingers 28 sweep over the curved surface of the platform 29 until they strike the cross-bar 36 on the brake lever 12 and raise the free end of the latter to slacken the brake band 11 and release the brake drum. In this'condition the weight ofthe loadV revolves the hoisting drum 8 in the reverse direction and the load lowers by gravity, itsspeed of travel being* controlled by slight' movements of the operating lever to tighten orloosen the brake band. In the loweringoperation the hoisting shaft may revolve idlywith the 'hoisting' drum until arrested by the tighteningof the brake band which, through' the differential, stops suchl rotation. Y

It will-be noted that vthe brake is' operated directly and positively by the movements' of'- acter set forth, a brake-drum, a brake-band thereon, a brake-lever for controlling said band, -an'operatingy shaft, ay platform on said lever concentric to said shafta bar on said lever, and a wingon saidv shaft arranged to contact-with said platformandhold said lever in position to'mainta-in th'efapplication of the brake during the traverse of said Wing along said plattorm, and to engage said bar at the end of such traverse and move said lever to release the brake.

3. In a hoisting mechanism of the character set forthj a brake-drum, a brake-band thereon, a brake-lever for controlling said band, an operating shaft, a platform on said lever concentric to said shaft, a bar on said lever at one end ot' said platform, a Wing on said shaft arranged to contact With said platform and hold said lever in position to maintain the application of the brake during the traverse of said Wing along said platform, and to engage said bar at the end of such traverse and move said lever to release the brake, and means for adjusting the position of said bar.

4. In a hoisting mechanism of the character set forth, a brake-drum, a brake-band thereon, a brake-lever for controlling said band, an operating shaft, a platform on said lever concentric to said shaft a bar on said lever at one end of said platiorm, a stop at the other end of said platform, a Wing on said shaft arranged to contact with said platform and hold said lever in position to maintain the application of the brake during the traverse of said Wing along said platform in one direction, and to engage said bar and move said lever to release the brake by a continuation of such traversing movement, and again to contact with said platform in a traverse in the opposite direction limited by said stop.

In testimony that I claim the invention above set forth, I aiiix my si nature hereto.

WILLIAM RUTAN.

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