US2348987A

US2348987A - Hoist

Info

Publication number: US2348987A
Application number: US315355A
Authority: US
Inventors: Lock Frank
Original assignee: Yale and Towne Manufacturing Co
Current assignee: Yale and Towne Manufacturing Co
Priority date: 1940-01-24
Filing date: 1940-01-24
Publication date: 1944-05-16
Anticipated expiration: 1961-05-16

Description

May 16, 1944.. LOCK HOIST Filed Jan. 24, 1940 2 Sheets-Sheet 1 ATTORNEY May 15, 1944. -c 2,348,987

HOIST Filed Jan. 24, 1940 2 Sheets- Sheef, g

INVENTOR f flN/f 4067/ TTORNEY Patented May 16, 1944 I UNITED STATES PATENT Frank mu, Philadelphia, Pa... assignorto The Yale & Town'e Manufacturing Company,

' Stamford, Coma, a corporation of Connecticut Application January 24, 1940, Serial No. 315,355

oFFics a 6 Claims.

This invention relates to hoisting mechanism. and more especially to a hoist of the type in which there is employed a drum having a spiral groove into which is wound a wire rope or cable.

More particularly, my invention relates to a combined rope guide and limit switch for a hoist of the class described. My invention also provides means for adjusting the rope guiding mechanism and the limit switch mechanism whereby to contribute much sought-for results.

More in detail, my invention provides a rope guiding member which is mounted for sliding movement on a shaft parallel to the axis of the hoisting' drum, there being provided limit switches adjacent each end of thedrum which are actuated by a portion of the rope guiding member, this portion being preferably cast integrally with the rope guiding member. By mounting the limit switches for adjustment preferably parallel to the movement of the rope guiding member, I make it possible to operate the limit switches by the rope guiding member in any position to which they are adjusted. The adjustment is exceedingly simple, as is apparent, and may be made practically in an unlimited number of positions.

As a further feature of my invention, 1 so mount the rope guiding member that it itself is adjustable relatively to its mounting means to bring it into proper cooperating relation with the rope and winding drum. Preferably, the means which are utilized comprise an eccentric sleevemounted between the shaft which supports the rope guiding member and the rope guiding member itself, it being obvious that rotation of this eccentric sleeve will adjust the rope guiding member. I I

For a detailed description of a preferred embodiment of my invention. I shall refer to the drawings wherein Fig. 1 is a perspective view of a hoist in which-my invention is embodied. I'.ig. 2 is a sectionalong lines 2-2 of Fig. 1, while Rig. 3 is a section along lines 3-! of Fig. 1. Figs,

M. A shaft I5 is secured parallel to the axis of the winding drum i0 and supports thereon in I a manner to be described presently, a rope guiding member l6. This rope guiding member Ithas a relatively long forward leg I1 and a shorter forward leg it, it being the function of a portion of the longerleg ii to ride in the groove II in advance of thewire rope l2, as' is best shown in Fig. 5, thereby moving the rope guiding member I and guiding the rope into the groove l'l. Ac-' tually, it is the surface Ila of the longer leg ll which lies in the groove i i.

The rope guiding member it has a further portion l9 similar to portion Ho and riding in a portion of the groove Ii somewhat behind theportion "(Land assisting the portion Ha in mov--' ing the rope guiding member, as willbe apple-- ciate'tl.

The rope I: is giuded by the legs n and In of the rope guiding member I 6 into the groove ii,

and a flat spring member 20 (Figs. 4 and 7-)' I which is sufliciently wide to overlap two iuxtaposed groove portions of the spiral-groove ll, as-

- sists in maintaining the rope H 'in position. It-

will now be obvious that rotation of the drum 7 will cause a movement of the rope guiding member ii on its shaft ii to guide the rope into and out of the spiral groove ii of the drum l0, depending: upon the direction of rotation of the drum".

I employ a novel construction for adjusting the rope guiding member is relatively to the remainder of the hoist, it'being obvious that such adjustment may become necessary, especially as the hoist wears. For the particular purpose, I interpose between the cylindrical portion 2i of the rope guide member i8 and the shaft I! an eccentric sleeve 22, best shown in Figs; 4 and 6. One end of this eccentric sleeve 22 h'as a hexagon head 2! whereby the sleeve maybe rotated to adjust the relationship between the cylindrical portion 21 of the rope guiding member' It and":

4. and 5 are sections along lines 4-4 and 5-5,

respectively, of Fig.2. Fig. 61s a sectionalong lines H of Fig. 4. Fig. 'l is a perspective view of my rope guiding member taken on an angle substantially opposite the angle of Fig. 1.

Referring now more particularly to the drawings, I show in Fig. 1 a form of wire rope hoist in which there is utilized a lifting drum ll havingformed therein a spiral groove ll into which is adapted to enter a wire rope H. The rope I! may be secured to the drum in any one of, several ways known in the art, and as the drum rotates.

the wire is woundinto the groove, all as will be appreciated by those skilled in the art.

For rotating the winding drum, I utilize a motor mounted in the housing I! and rotating the drum through suitable gears in the housingthe shaft l5, all as will be quite apparent..

For maintaining'the sleeve 22m any adjusted position and "against movemehtirelativelyto the cylindrical portion 2| of tnerop guidingmemher it, I utilizefa bolt'j'l screw threaded into an offset portion extended "from the --cylindricalportion 1|: -,Whn"this bolt';is' tightened? it ac'ts through the'Jwasheu Bjto secureat head. 2: 'of"t;he"sleev whatsoever; Itisih'o ght tnar'me' cons of m 'h uamgnesyei-snd fitsfnianner of tion w ll nowapparquiteelea' A pair o'f braclr'ets" Zffexteiidi 's zrw which are housed an *up'per lirnit' switch 'fl *iiiitb a lower limit switch 30. Since these switches are identical in construction, mounting and operation, only the lower limit switch will be described in detail. The wiring of the switches and their relation to the hoisting motor circuit is not here shown since that is not part of the invention, being similar to that of the usual paddle operated limit switches well known by those skilled in the art.

Referring now particularly to Figs. 1-3, it will be noted that within the open'casing 28 there is a longitudinally extending box-like bracket 3| slotted as at 32 for the passage of the headed bolts 33 maintained in threaded engagement with a threaded plate 34 held within the boxlike bracket 3|. The limit switch 30 is supported by L-shaped brackets 35, each of which is bored for the passage of the headed bolts 33. It is obvious that by loosening the bolts 33 relatively to the threaded plate 34, it is possible to slide the limit switch 30 and plate 34 relatively to the bracket 3| and into any particular adjusted position.

Each limit switch is equipped with a push button 36, and this push button is adapted for operation by an arm 31 extending upwardly from the rope guiding member 16, and preferably integral therewith. It is obvious that in the lowered position of the hoist, the arm 31 will actuate the push button 36 of the lower limit switch 30, while when the load is raised, the arm 31 will actuate the push button 36 of the upper limit switch '23. It is obvious further that because of the manner in which the adjustments are made in the position of the lower limit switch, and of course of the upper limit switch, the arm 31 will operate the switches quite effectively in any adjusted position.

While I have shown .a preferred embodiment of my invention, it is obvious that many other forms thereof incorporating my contribution to the art will be readily conceived by those skilled in the art. I shall therefore claim a monopoly of such breadth as to prevent the utilization 'of my contribution by others.

I claim:

- 1. In a hoist of the class described, a rotating drum having a spiral grooved surface, a hoisting rope adapted for spiral winding in the groove of said surface, a rope guiding member having a portion fitting into the groove of, said drum, a shaft parallel 'to :the axis of said drum :and about which :said member is mounted for sliding movement,wv'l'iich:sliding movement is imparted to said member through said portion by rotation of said drum, means whereby said member ,guides the bar and said shaft, rotation of said sleeve relatively to said rope guiding member acting through said eccentric to adjust the position of said member on said shaft and relatively to-said drum.

3. In a hoist of the class described, a rotating drum having a spiral grooved surface, a hoisting rope adapted for spiral winding in the groove of said surface, a rope guiding member having a portion fitting into the'groove of said drum, 0.

shaft parallel to the axis of said drum and about which said member is mounted for sliding movement, which sliding movement is imparted to said member through said portion by rotation of said drum, an eccentric sleeve imposed between said rope guiding member and said shaft, rotation of said sleeve relatively to said rope guiding member acting through said eccentric to adjust the position of said member and its groove eng portion relatively to said drum.

4. In a hoist of the class described, a rotating drum having a spiral grooved surface, a hoisting rope adapted for spiral winding in the groove of said surface, a rope guiding member having a portion fitting into the groove of said drum, a shaft parallel to the axis of said drum and about which said member is, mounted for sliding movement, which sliding movement is imparted thereto through said portion by rotation of said drum, a sleeve fitted on said shaft and having a circular surface eccentric relatively to said shaft, said rope guiding member being mounted on Said shaft through the intermediary of said circular surface, and means for rotating said sleeve on said shaft to adjust the position of said member and its groove engaging portion relatively to said drum.

5. In a hoist of the class described, a mtathg drum having a spiral grooved surface, a busting rope adapted for spiral winding in the .gmdwe of said surface, a rope guiding member a portion fitting into the groove of said drum, a

rope into-said drum as the drum rotates, an electric swltchzpositioned at each end of said drum, means forming part of said rope guiding .member fonactuating one switch when said rope guiding member moves to one end of saiddrum, and

for actuating the other switch when said rope' guiding member moves to the other end of said ilrum, and an eccentric sleeve imposed between :said rope aguiding member and said shaft, :rota- .tion of..said:sleeve relatively to said rope vguiding member-acting through said eccentric to adjust the position of said member and its groove engaging. portion relatively to said shaft.

2. In :fillOiSl? of the class described, a rotating drunifihaving a spiral grooved surface, a hoisting rope -;a'daptecl for spiral winding in the groove of .said surface, a rope guiding member, a shaft paralllitdthe axis of said drum and about which said vmember is mounted for sliding movement, means whereby rotation of said drum imparts slidingniovement to said member, an eccentric sleeve imposed between said rope guiding mem-Q 76 shaft parallel to the axis of said drum and about which said member is mounted for sliding movement, which sliding movement is imparted thereto through said portion by rotation or said drum, an eccentric sleeve imposed between said rope guiding member and said shaft, rotation "of said sleeve relatively to said rope guiding member acting through said eccentric to adjust the position of said member and its groove engaging portion relatively to said drum, and means for securing said sleeve and rope guiding member for movement as a unit on said shaft.

6. In a hoist of the class described, a rotating drum having a spiral grooved surface, a hoisting rope adapted for spiral winding in the groove of said surface, a rope guiding member having a portion fitting into the groove of said drum, a shaft parallel to the axis of said drum and about which said member is mounted for sliding movement, which sliding movement is imparted thereto through said portion by rotation of said drum, a sleeve fitted on said shaft and having a circularsurface eccentric relatively to said shaft,

said rope guiding member being mounted on said shaft throughtheintermediary of said circular surface, means for rotating said sleeve on said shaft to adjust the position'of said member and its .groove engaging portion relatively to said drum, and means for securing said sleeve and ropeguiding member for movement as a unit on said shaft.

FRANK LOCK.