US1452964A - Hoisting mechanism - Google Patents

Description

Apr. 24, 1923. 1,452,964

A. f-'ALKENAU HoIsTIN-G MECHANISM Filed April 9. 1921 Patented Apr. 1923.

- UNITED. STATES PATENT OFFICE.

ARTHUR FALKENAU, OF NEW YORK, N. Y., ASSIGNOR TO GILLIS & GEOGHEGAN, F

' NEW YORK, N. Y., A FIRM.

Hors'rme MECHANISM.

Application filed April 9, 1921.

To all whom t maycoacem:

Be it known that 1, ARTHUR FALKENAU, a citizen of the United States, residing in the city of New York, borough of Manhattan, in the count-y andbtate of New York, have invented a certain newand useful Improvement in Hoisting Mechanism, of `which the following is a specification.

The invention relates toelec-trically operated hoisting machines, and more particularly to ash-hoists designed to raise ashes and'like loads in sidewalk lioistways.

The present invention is based on` the structure shown and described in Letters Patent of' the. United States granted to Joseph H. Donat for an improvement in hoisting mechanism, dated March '9, 1920,` No. 1,333,064, in which the hoisting, lowering.I and braking operations together with the operation of the, switch are all controlled by swinging a single operating-lever into corresponding positions, the'operating-lever being automatically forced into the neutral position at the completion of the hoisting operation by a slow reverse movement of the lever, the result ybeing a slow movement of the controller switch in breaking the circuitto stopl the motor.

The object of the present invention is to provide simple and efficient means for automatically disconnecting the operating-lever from its shaft and turning the latter and the controller switch instantly to the neutral position whenthe hoisting operation is coinpleted. The invention consists. in certain novel features of construction and arrangement by which. the above objects are attained,` tobe hereinafter described and claimed.

The accompanying` drawings form a part of this specification and` show' the invention as it has been c-arried out in practice.

Figure 1 is a plan view of a hoisting head constructed in accordance with myy inve-n-` tion, with the main porti-ons kof the electric motor omitted. y

Figure 2 is a correspond-ing side elevation., i

Figure is a vertical transverse section through the head, taken on the line 3--3 in Figure 1, mainly in elevation andshowing the operating-shaft, and its connections.

Y Figure v4 is. an. elevation on a. larger scale showing the means for automatically turn- Seral No. 459,963.

ing the operating-shaft to the neutral position, and partly in vertical section.

Figure 5 is a corresponding vertical section taken on the line 5)*5 in Figure 4, partly in elevation.

Figure 6 is a sectional view line 6-6 in Figure 2.

Figure 7 is a horizontal section taken on the line 7 7 in Figure 2.

Referring to the drawings, the operatingshaft 2 extends transversely of the hoistinghead 1 and is equipped to operate the brake on the hoisting-shaft 3 and thus control the action of the differential gear, indicated-at 4, and the hoisting-drum 5, in a manner analogous to that set forth in Letters Patent No. 1,333,064 above referred to, and the hoisting-shaft 3 through the beveled pinions 6 and? turns a screw-shaft 8 alternately in opposite directions as the load is raised or lowered, and causes a nut 9 to travel corretaken on the spondngly on the screwshaft substantially as in such Letters Patent.

In the present invention the overhung end of the operating-shaft 2 carries an annular serrated clutch member 10 adapted to be engaged by a similar clutch member 11 on the head 12 of the operating-lever 13, loosely inclosing the shaft 2 and held in separable engagement. with the member 10 by ya helical expansion spring 14 encircling the end"` of the shaft 2, received in an. annular recess in the head 12, and abutting against the collar 15 fixed on the shaft 2.

Depending from the nut 9 is a lug 16 having its outer vertical face beveled orinclined from front to rear as shown in dotted lines in Fig-ure 1, and adapted at the termina-tion of its. rearward travel to contact against an oppositely inclined surface on the inner face of a spur 17 fixedon thev head 12 and thus. move the latter outwardly and axially to disen-.gage the clutch members and releasethe operating-shaft 2 from the operating-lever 13,.

On the annular clutch member 10y and shown as integral therewith is. an arm 18 extending downwardly and pivotally connected at its end toy a link 19 which is. similarlv joined to a crank-arm 20y on the controller-shaft 2-1 extending intoy thecontroller box 22 and carryingthe usual movable arm ofV a switch indicated at 23. in Figure 3.

Fixed. on the operating-shaft 2 adjacent to a portion vof the frame is a long collar 24 having a radially extending arm 25 carry ing a pin 26 parallel with the shaft, and .from the frame'eXtends another pin 27 located out of the arc desc-ribed bythe pin 26 in its oscillations with the operating-shaft. 'Ihe collar 24%. is encircled by a helical torsional spring 28 having its endsextended radially in the same direction but separated by the pins 26 and 2T as shown in Figures el. and 5, and so disposed by the pins asv to eXertits force to hold the shaft 2 yieldingly in the neutral positionfshownin Figures f1 and 5 in which the current is `cut olf from the motor by the switch l23.'

The operation is as .follows:-Assuming the operating-lever 13 to be engaged with its clutch and swung to thel left'in Figure 2; in thisposition the operating-shaft will be partially rotated against theres'istance offered by'the spring 28, the switch 23 will be thrownto the position to supply ,current to the motor, the hoisting-drum will be re volved in the direction to hoist' theload,

- Vand the nut 9 traversed along the screwshaft 8 toward the head 12 of the operatinglever 13. At the limit of the hoisting movement the lug 16 on the nut engages the spur 17 and forces the head 12 outwardly against the force of the expansion spring 111 while l the operator still holds the operating-lever 13 in the hoisting position, thus separating the clutch members 10 and 11 automatically andreleasing the shaft. 2, which, by the tension ofthe'torsional spring 28, instantly returns to the neutral position and through the connections 18, 19 andv 2O throws the switch 23 inthe direction to cut off the' currentlto the motor. The same partial revolution Yof the operating-shaft 2 conditions the brake mechanism to hold the load suspended. rI`he operating-lever 18 may be returned by the operator or by gravity to its neutral position in which its clutch member 11 will again engage with the clutch member 10 on the shaft, and may thenbe 'swung in they opposite direction to lower the load when de-4 sired. i

The engaging kfaces of the clutch members are preferably rectangular to permit them to slide readily. upon eachother, and .it will be noted that the ydisengagement of the clutch members, the return movement. of the operating-shaft, and the action of the switch 23 are practically instantaneous instead vof the relatively slowk action. produced by the gradual advance movement of the nut against the lever in the structure shown in the Letters Patent above ,referredv to..

Other means than the torsional spring 28 may be employed to return the operatingshaft to its neutral position, andthe means employed to transfer such movement to, the switch may be variedgfand othe'r modifications may be made as found necessary or desirable in adapting the invention, to various types of 'hoisting'mechanism' l claim 1. In mechanism of the character set forth, screw-shaft, a nut arranged to travel thereon, an operating-shaft having a clutch member and connections to a switch, an operating-lever on said operating-shaft, having a clutclr'member adapted to engage said shaft clutch member to turn said operating-shaft, means actuatedV by said nut for disengaging said clutch members, and means for automatically returning said operating-shaft.

2. In a mechanism of the character set forth, a screw-shaft, 'a nut arranged to travel thereon and having an inclined face, an operating-shaft having a clutch member and lconnections to a switch, an operating lever slidably mounted on said operatingshaft and having an inclined face and a clutch member adapted to engage said shaft',.-clutch ymember toturn said operatingshaft, said inclined faces adapted to contact and separate said clutch members, and yielding means'for automatically returning said operating-shaft.

3. In a mechanism of the character set forth, a screw-shaft, a4 nut arrangedl to travel thereon, an operatingeshaft having `a .f

clutch member, anoperating-lever slidably mounted on said operating-shaft, having a clutch member adapted to engage said 'Shaft clutch member to turn said operating-shaft, means actuated by the movement of said nut for disengaging said clutch members, yielding means for automatically returning said operating-shaft, and yielding means for reengaging said clutch members. i

4. In a mechanism of the character set forth, a hoisting-shaft, an operating-shaft having connections to a switch, an operating-lever slidably mounted on said operat` ing-shaft, a clutch between said operating# lever and operating shaft, means actuated by said hoisting-shaft for disengaging said clutch, and'me'ans for automatically returning said operating shaft to the neutral position when said clutch is disengaged.

5; In a mechanism of the character set forth, a hoisting shaft, an operating-shaft having connections to a switch, an operating-lever slidably mounted on said operatingshaft, a clutch between said operating` shaft'and operating-lever, means actuated by said hoisting-shaft for disengaging said clutch, means for automatically returning said operating-shaft to the neutral position when said clutch is disengaged, and yielding means for moving said clutch into -re-engagement.

In testimony vthat I claim the invention above set forth I aiix my signature.

ARTHUR FALKENAU.

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