US836789A - Portable electric hoist. - Google Patents

Description

PATENTED NOV. 27, 1906.

W. N. VANCE. PORTABLE ELECTRIC HOIST.

APPLICATION I' ILED JULY 9 1906.

2 SHEETS-SHEET 1.

INVENTOR Alfanny PATENTED Nov. 27, 1906. w. N. VANCE. PORTABLE ELECTRIC HOIST.

APPLICATION FILED JULY9,1906.

2 SHEETS-SHEET 2.

UNITED sTA rns PATENT OFFICE.

WALTER NOBLE VANCE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE I YALE & TOWN E MANUFACTURING COMPANY. OF STAMFORD, CON- NECTICUT.

PORTABLE ELECTRIC HOIST.

No. 83G,789.

Specification of Letters Pater? Patented Nov. 27, 1906.

Application filed y 9, 1906- Serial No; 325,388.

To mZLw/wm it may concern.-

Be it known that-I, WALTER NOBLE VANCE, a citizen of the United States of America, residing at No. 120 Lincoln Park fioulevard, Chicago, Illinois, have invented certain new and useful Improvements in Portable Electric Hoists, of which the following is a specification. I

My invention relates to an improvement in portable electric hoists, the object of the invention being to so arrange the motor and controller with relation to the hoist-block that the vertical space occupied by the mechanism will not be increased over that taken up bythe ordinary chain-block.

A further object is to provide devices that will automatically prevent overhoisting or overlowerlng and also stop the motor in the event the hoist-chain becomes stretched or worn so that its pitch is increased- With these ends in view my invention consists in the parts and combinations of parts,

' as will be more fully explained, and pointed out in the claims.

. In the accompanying drawings, Figure 1 is a view in front elevation of my improved hoist. Fig. 2is a top plan view, the suspending-hook andchain or load sheave and-shaft of the latter being removed, so as to show the safety-stop 6. Fig. 3 is a view in longitudi- 'n'al vertical section through the safety-stop, showing the position of the chain-links there in; and Fig. 4; is a plan view. of the safetywhiclrin some situations and stop.

well-known. triplex block manufactured bythe Yale & Towne Manufacturing Com- 2 is an electric motor of any approved type or construction rigidly secured to one side of the block 1,, and 3 is a controller located on the opposite side of the block, these three members being so connected and arranged that when the apparatus is suspended from 45 1 its hook 4 they a rest in the same horizontal lane; consequently do not take up any more cad-room than the ordinary triplex block, buildings is an important matter.

The motor is preferably geared up to the hoist 1 by the chain 5, which permits of a certain amount of flexibility and which also ern1its of the use of the regular hand-w eel used on the manually-operated blocks; but,

1 represents a chain-block, preferably the" if desired, gear-wheels can be employed in lieu of the chain.

I make no claim in this application to any particular form of motor and controller nor to the means employed in connecting them to the block, as my invention com rehends simply the relative arrangement 0 the motor, controller, and block and the safety device for automatically actuating the controller for sto ping the motor under certain conditions, w 'ch will be more particularly referred to later on.

6 is the safety-stop, which consists of a lever pivoted to the block below the chain or over pocketed wheels the chain must be prolperly guided, so as to work smo'othly in pockets. Normally when the chain is running properly it is evident that the links will approach the sheave alternately sidewise and endwise. The guide-opening 7 in the ends of the safety-stop are constructed to the chain so that it will reach the poo eted sheave in this manner.

Mounted to slide in the safety 'stopor lever Sis the reciprocating or sliding rod 9, which latter is of a length sufficient to project into both guide-openings 7 in the safety stop or lever 6. The number of link recesses or pockets in the chain or load sheave is such that with a chain of normalpitch when a link is edgewise in one guide 7 the chain-link in the guide at the op osite end of the safety sto or lever will be atwise. Consequent y w en the link which is passing through the guide endwise is opposite the rod 9 it will engage the latter and move it longitudinally toward the other guide; butflas the link in that guideopening is fiatwise with relation to the periphery of the chain-sheave the movement of the rod 9 is not interfered with,- nor does the .rod interfere with the passage of the chain link through the guide-opening. If, howide ever, the chain becomes stretched orworn, so

' that its pitch is increased, which will have the eflect of lengthening the chain, then when such lengthening is sufficient to make it dan gerous the relation of the-chain-links in the two guides Will be changed, so that when the edge of one link pushes on the rod the latter will be move longitudinally into the other guide, but, owing-to the increased'length of the'chain, it will encounter the edge of an-" other link. This simultaneous-engagement .of the sliding rod with two linksblocks the movement of the 'chains and causes the safety-sto 6 to rock on its fulcrum.

Pivotal y secured tothe end of thesafety stop orlever 6 'on the controller side of the apparatus is the rack-bar 10, This rack-bar 10 projects into the controller-casing, and the teeth thereon mesh with. pinion 11 on the controller shaft:12',the upper end-of the link be ing held in contact withthe pinidn 1 1- and guided in its movements by the arms 13,

- carrying a roller, the latter resting in a posi- 2 5 when the safety stop or lever 6 is rocked on its fulcrum by the locking of the chain by tion to bear on the rear face of rack-bar 1O. With this arrangement it will be seen that I the sliding rod 9 the rack bar 'i O willbe moved longitudinally, and the teeth thereon engaging the pinion 11 will automatically rotate the controllershaft and in ,a direction to shut off the power, and thus bring the hoist to a stop he link may operate to shut off the power by movingeither up or down. Consequently the automaticstop becomes efiective both in hoisting and lowering a load and prevents overhoisting 0r overlowering.

The controller and the motor-are connected up by wires toa generator, and the conmight be resorted to in the'relative arrange ment of parts shown and described without I departing from the spirit and scope of my invention. Hence Lwould have it understood that I do not wish, to limitmyself to the eX- act constructionand arrangement of parts shown and described; but, 4

, Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is+- 1. In an electric hoist, the combination' with a' load or chain sheave mounted in a frame, a motor secured to said-frame at one side and an electnc controller secured to said frame at-the other side, the armature of the mntorf t'he load-sheave of the hoist and the controller-shaft being in substantially the same horizontal plane, of means connecting the motor and load or chain sheave, and means for'actuating thecontroller.

2. The combinatioriwith a chaimblock, a

motor, a controller, and gearing for .transmitting motion from the motor tothe load or chain sheave of the block, of a safety 'stop having guid'e openings for the passage of the hoist-chain, the said openingsibeing' construc'ted to guide the chainalternately flatwise and'edgewise to and from tlfe fink-rd cesses in theper'ipheryof the chain-sheave.

' 3. The combinationwitha chain-block, a

motor,- a controllciyjand gearing for -trans-' mittingrnotionfrorn the motor to the load or chain sheave of the block, of'a pivoted lever having openings therein for'thepassage of the two ends of the hoist-chainand'means connecting said lever and thecontroller shaft, whereby when the lever is rocked the shaft is rotated. I I v 4: The combination with -achain-bloc'k', a motor, a controller and gearing for transmitting motion from the motor to the load or.

chainsheave of the block, of a pivoted lever projecting into said openings 2, chainpassing through said guides and aroundthe chain or load sheave and means connecting said-lever,

and the controller-shaft.

5. The combination with a'chainblock, 'a motor, controller, and gearingfor transmit- 9' having guide-openings for the two parts of i the chainf'zfsliding rod located between and ting motion from the motor to the load or chain sheaveof the-block, of a pivoted lever having guidesopenings for the'two ends of the chain, a chain passingthrough said openings and around thesheave, a'slidingrod' carried by the pivoted lever and-adapted to;p10ject' into both guide-openings in said lever'fand a rack-bar pivoted to said; lever and eme'shing with a pinion on the operating-shaft of the controller. I

6. The combination witha chain-block, a

motor, controller and "chain connecting the armature-shaft; of the motor and a chainsheave on the driven shaft of the chain-block,

of a pivoted lever having guide-openings for the passage of the'two parts of tr e chain, a chain passing through said openings and aroundthe sheave, a sliding rod carried by the pivoted lever" and adapted to project into both guide-openings in said lever, and a rack-v bar pivoted to said lever and meshing with a pinion on the operating-shaft .of the con} troller. I

In testimony whereof "I, WALTER NOB LE VANCE, have signed myname'to this specification, in t he presence of two subscribing witnesses, this 12th day of June, 1906.

WALTER NOBLE VANCE.

Witnesses:

WM. A. CUDLr'rr, F. O. Somans.

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