US2343640A - Hoist - Google Patents

Description

v'Meh 7,1944. A BROWN'. 2,343,640

HOIS'I' Filed Nov. 27, 1942 Patented Mar. 7, 1944 entre UNI STAT ESSL- E.ilt'lENTfv 3 Claims.- (Cl. 254-168')"` The present invention relates general1yto.

hoists. that type of hoist which is used for raising and More particularly the invention relates to lowering loads and comprises a drum,a reversible.-

electric motor connected through speed reducing-l gearing to drive the drum yin either direction, a hook equipped load carrying block, .and a cable.- aranged to form a depending loop furthe-blockr and having one endthereof anchoredandnits other end attached to, and wrapped orv wound whichdike numerals. of referencedenote corresponding :parts :throughout the.' severaiyiews:

Figure 1 is a .side View ,of a hoist. embodying., y

the inventiom. and.

Figure 2 .isahorizontalsection taken on the line 2-.2 of Figure l and illustratingin detail the construction and design of the .fmeans for-taking y up voiwpayingcut the anchored .end ot the cable.

in connection .with adjustment of. the. load .after -.l0-stoppage of the electric motor..

around, the drum to the end that Whenthe drum is driven in one direction so as furtherto wind the other cable end thereon the loop is shortened f and the block and loa-d thus raised and'whenthe druml is reversely driven the loop is extendedand the block and load are hence lowered.

In a hoist of this type the electric motorlis'op.h

erated until the load approaches the.desired. height and is then stopped. Because the. hoist.

operator` is generally unablev to stopthe. electric motor at the proper momentit is extremely dif. icult to raise or lowertheload to a p1ecise.pre. determined height.

The primary object of this invention is-to.p1'o,

vide a hoist of the type under considerationem-V Another object of the invention isto. provide..

a hoist of the. lastA mentioned charactenin which.v the means for taking upm' paying out the cable. consists of a threaded .element on the anchored.. end of the cable and a nut which is mountedon..

the element and operates in response ttoturning thereof to shift the element longitudi-nallydorcable adjusting purposes.

A further object of the invention `islto .provides-z a hoist which is generally of new and improved construction and is more eiicient than. previousv ly designed hoists of like character by reason ofv the fact that it includes a micrometric type. ad-ey justment whereby the load may. be adjusted to a' nicety after stoppage of the. electric motor.

Other objects of the invention' and the various: advantages and characteristics of the `present .hoist will be apparent from a consideration of the following detailed description.`

The invention consists in the several novelfeatures which are hereinafter set forth and Aarev` more particularly dened by claims at the conclu'sion hereof.

In the drawing which accompanies and forms a part of this specication or disclosure and in The4 hoist which -is .Shown inthe drawingconj stitutes the preferred former. embodiment of the invention.. Itis. designed .or adapted .to raise or lower loads.` yand comprises asupportingstructure 1- 3, .a .drum ,4,..an,electric;1notor5, a load carrying blocky and a block supportingcable 1.

The.. supporting structure .3 fis in the form-of a carriageand. embodies a horizontally extendingrectangularplatforrn.8,. uprights 9 at the `corners .of the platform, and ,a rectangular'. angle bar type frame. l@ at. the upper. ends of the upf rights. Inaddition tothe aforementioned parts the.,supporting. .structure comprises .wheels li whichare mounted adjacent the. frame vill and are adapted tov .travel `Aon .a .horizontally `extending-.track ,l2 .so that the. hoist may be shifted horizontally-.Instead ofA being in theform of a carriage-Lthe supporting, ,framemaybe xed or stationary?dependingL upon thework to be performed vbyit.. V

The drum 4 isdisposed over the .platform and' is..carriedby-a bearingbracke't 1I3 so that it is rotatable abouta horizontal. axis. The bracket I 3 restsupon the platform .8 andis secured tothe latter` in any suitable manner.

The electricv motor 5 iis of lthe reversible type and serves .asa mediunrior driving the drum 4 in. either` direction. It.' is. drivably' connected `to the drum by.way. of a geary typelspeed reducer 14. Thelatter and-.the motor. ,5.aremounte`d on the platform 8 of the supporting...struc.ture. 3.

rIhe block 6 is disposed beneath`;the'suppo1ting structure... It' is of conventional .orstandard design Vand comprises a frame |5,'a'sheave i6. and a hook .I'Ij' Thesheave I6 is rotatably vmounted onthe frame and, extendsvertically. The hook Il is connected .to',.and.depends from,.the.lower portion .of the frame and servesas .a medium for attaching` the load .or work tothe block;

The. cable 'l i-s arranged .to forma depending loop,.the.lower portion of which islreeved through the. block 6 'and .extends-around .the sheave I6.Y

One-end .of .the cable is fixedly `attached to the drum! `and is' wound or vWrapped.around `the drum'.. The other end of'ithe cableisadjustably anchored as hereinafter described. When the drum 4 is driven by the electric motor 5 so -as to wind up the wound or wrapped end of the cable the loop is shortened with the result that the block and any load carried thereby are caused to raise. Reverse rotation of the drum in response to reverse drive of the electric motor 5 results in downward extension of the loop and resultant lowering of the block and load. The so-called anchored end of the cable l extends around a. vertically extending sheave I8 at the upper portion of the supporting structure 3 and is suitably attached to the eye of a horizontally extending eye bolil I9. The sheave I8 is rotatably mounted on a horizontally extending shaft which is carried by the side members of the frame I0. The shank of the eye bolt projects outwards of one end of the supporting structure 3 and overlies a laterally extending bracket 2l on the adjacent end of 'the angle bar frame I0 of the supporting structure. It is threaded from one end thereof 'to the other and extends through aligned or coaxial holes in the upper ends of a pair of laterally spaced upstanding` lugs 22 on the bracket 2l. A nut 23 is mounted on the shank of the eye bolt I9 and is positioned or disposed between the lugs 22. The central portion of the nut is in the form of an elongated hub, the ends of which bear against the inner faces of the lugs 22 and prevent axial displacement of the nut. The outer portion of the nut is shaped to form a pulley 24 having a grooved periphery. An endless exible element 25 extends around the pulley 24 and is adapted when pulled to rotate the nut 23. When the nut is rotated in one direction the eye bolt is moved axially or longitudinally away from the supporting structure and causes take-up ofthe anchored end of the cable and resultant upward adjustment of the block and load. Reverse rotation of the nut causes the eye bolt to move axially in the direction of .thesupporting structure and results in the anchored end of the cable being paid out and resultant downward adjustment of the block and load. The endless element is formed of a chain and depends from the pulley 24. llt is sufficiently long so that it may be lreadily grasped by the operator of the hoist. The nut 23 and the eye bolt I9 constitute a micrometric type adjustment whereby the anchored end of the cable may be taken up or paid out to eieot vertical adjustment of 'the block `6 after stoppage of the electric motor 5. The endless element 25 and the pulley 24 constitute simple means whereby the openator of the hoist may readily turn the nut 23 in either direction in connection with adjustment of .the block and load. By reason of the fact that the hoist includes the micrometric type adjustment ythe load, after being brought, by manipulation of the drum, to :approximately the desired height, may be accurately adjusted.

When the hoist is to be. used the block 6 lowered so as to bring the hook l1 into a position wherein it may be applied to the load. Lowering of the block is eiected by operating the electric motor 5 so that it drives the drum 4 in such direction as to cause unwinding of the wrapped or wound end of the cable. After attachment ci' the hook Il of the block 6 to the load the load may be hoisted or raised by reversely driving the electric motor 5. Reverse drive of the motor causes the drum 4 to Wind up the end of the cable that is attached thereto'and this,

as previously pointed out. results in shortening of the cable loop and raising of the block. When the load is elevated to approximately the desired height the motor 5 is stopped. In the event that the load is `not disposed at the precise desired height the nut 23 is turned in one direction or 5 the other, depending upon whether it is necessary to take-up or pay out on the anchored end of the cable. Rotation of the nut relatively to the eye bolt lis effected by pulling downwardly on one side of the endless element 25. If it is l0 necessary minutely to raise the block in Order to position the load at the proper elevation or height the end is turned so 'as to shift the eye bolt I 9 away from the supporting structure 3.

Outward displacement of the eye bolt in response l5 to turning of the nut causes the anchored end of the cable to be `drawn upwards. Should it be necessary to lower the block 6 in order properly to position the load the nut is reversely rotated.

Reverse rotation of the nut causes the eye bolt I9 to move inwards, that is, towards the supporting structure 3, and results in paying out of the anchored end of the cable.

The herein described hoist is essentially simple in design as well as efficient in operation. By in- 25 cluding a micrometric type adjustment the hoist may be effectively used in instances where it is essential to place the load at a precise predetermined point.

The invention is not to be understood as re- 80 stricted to the details set forth since these may be modied within the scope of the appended claims without departingfrom the spirit and scope of the invention.

Having thus described the invention what I claim as new and desire to secure by Letters Patent is:

1. A hoist comprising a supporting structure having mounted thereon a lug with a horizontal aperture therethrough, a drum rotatably mounted on the structure, a prime mover on said structure for driving the drum in either direction, a

load carrying block beneath the drum, a cable arranged to form a depending loop with the bottom portion thereof reeved through the block.

' and having one end thereof attached to and wound around the drum, and means on the structure for anchoring the other end of the cable while at the same time permitting it to be minutely taken up or paid out for block and load adjusting purposes, comprising an elongated horizontally disposed externally threaded element connected to said other end of the cable and extending through the aperture in the lug, a nut mounted on the element and disposed adjacent the side of the lug that is remote from said other end of the cable, a vertically extending pulley fixed to the nut. and a manually manipulable flexible endless element trained around the pulley for rotating the latter and the nut.

2. A hoist comprising an overhead supporting structure having mounted thereon a lug with a horizontal aperture therethrough, and in addition a Vertical sheafve adjacent the lug, a drum rotatably mounted on the structure, a prime mover on said structure for driving the drum in either direction, a load carrying block beneath the drum, a cable arranged to form a depending loop with the bottom portion thereof reeved through the block, and having one end thereof attached to and wound around the drum and its other end trained over the sheave, and means for anchoring said other end of the cable While at the same time permitting it to be minutely taken up or paid out for block and load adjusting purposes, comprising an elongated horizontally disposed externally threaded element connected to said other end of the cable and extending through the aperture the lug, a nut mounted on the element and disposed adjacent the side of said lug that is remote from the sheave, a vertically extending pulley xed to the nut, and a vertically elongated, exible, endless element having the upper end thereof trained around the pulley, and adapted tobe manually pulled in order to effect rotation of the pulley and nut.

3. A hoist comprising an overhead supporting structure having an upstanding apertured lug at one end thereof and a vertical sheave inwards of the lug, a drum rotatably mounted on the structure, a reversible electric motor on said structure for driving the drum in either direction, a load carrying block beneath the drum, a

cable arranged to form a depending loop with the bottom portion thereof reeved through the block and having one end thereof attached to, and I tically extending pulley xed to the nut, and a.

flexible element trained around the pulley and adapted to rotate the latter and nut.

ARTHUR J. BROWN.

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