US1684988A - Clayton h - Google Patents

Description

c. H. HoMAN HOIST Filed sept. 2o, 1923 Sept. '18. 1928.

E' TV1 L N 2J 56 Mrap/0f Patented Sept. 18, 1928.

UNITED ysinerss viin-rllezlai orrics.

` CLAYTON H.`IIOMA1\T, OF CLEVEIJLID,` OHIO, ASSIGNOR TO THE C. G. SPRING & EUMIJER COMPANY, OF DETROIT, MICHIGAN, A CORPORATION F DELAWARE.

Application filed September 20, 1923. Serial No. 663,731.

ihis invention relates to hoists and has 'for its primary object to provide a particularly compact and ciiicient torni oit hoist which shail be simple in construct-ion and inexpensive to nranufacture.` y

Another object is to provide a hoist of this character which may be started, stopped or reversed instantly througl'i t-he medium of a lever control and which shall be capable ot sustaining its load at any point.

TW ith these and other objects in view, the invention consists in the various novel teatures of construction and arrangement or comw bination, all of which willbe fully described hereinafter and pointed out in the appended claim.

In the drawings accompanying and orming a part of this application, Fig. 1 is an elevation of a hoist constructed in accordance with my invention; Fig. 2 is an enlarged view partly in elevation and partly in section of the hoisting mechanism; Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1; and Fig. i is a diagrammatic view illustrating the electrical connections.

Describing the various parts by reference characters 1 denotes a mast from which a boom 2 is pivotally supported. This boom has mounted thereon a hoist-ing mechanism indicated generally at 3 which is adapted to wind and unwind a cable 4f. to raise and lower various objects.

The hoisting mechanism as shown in Figs. 2 and 3 comprises a channeled base 6. on which is mounted an electric motor 7 The shaft 8 of the motor is extended to a point adjacent the opposite end of the base and has mounted thereon aninion 9 which meshes with a gear 10. This gear is keyed to a pinion shaft 11 which is iournaled in a gear housing 12 that depends from base 6. Pinion shaft 11 carries a pinion 13 which meshes with a gear 111 that is keyed to a sleeve 15 surrounding the motor sha'tt. This sleeve is journaled in the gear housing 12 and also in a bearing block 17 depending from the base. Mounted on sleeve and extending between the gear housing and bearing block` is a hol low grooved drum 18 which is adapted to receive the hoisting cable f1. This drum may be conveniently formed :from an externally grooved cylinder which is closed at each end by a dish 19 and the drum as a. whole is tastened by set screws 2O to the sleeve.

A brake drum 22 is keyed to shaft 8, and

a pair of brake shoes 23 are each hinged to the hase as indicated at 24, and are disposed about the drum and normally urged into irictional contact therewith a spring 25. r[his spring` is interposed between one otsaid shoes and a nut 26 which is threaded on a bolt 27 that extends through the free ends ot said bands. A cam 30 is disposed between the tree ends of the brake shoes and is providedwith a slot 31 (Fig. 2)V to permit bolt 27 to pass freely therethrough. Cam 30 is carried by a rod 32 that is pivoted at one end in bearing block 17 and at the `opposite end said rod is deflected downwardly as indicated at 33 and then laterallyV as indicated at 34;.

A solenoid 36 is mounted on one Iside of base 6 and is provided with a core 37 which is pivotally connected, through a rod 38, with the lateral extension 311 of the cam shaft. From the foregoing description it will be obvious that when solenoid 3G is energized, the pull on core 37 will be transmitted through rod 38 and shaft 32 to rotate cam 30 and thereby spread the free end-s of the brake shoes against the tension of spring 25. l/Vhen the solenoid circuit is broken the spring 25 will return the parts to normal position and engage the'bralre shoes with the brake drum to prevent movement of the hoisting mechanism.

In order that inexperienced operators might use the device, I have provided a simple control switch consisting of a cylinder 39 formed from insulating material and provided with tive contacts which are adapted to engage live stationary contacts designated A when the cylinder` control handle 10 is rotated in one direction and engage a second set of live stationary contacts B when rotated in an opposite direction. A source of three phase alternating current is connected with three ol the contacts on the cylinder and the other two contacts are connected to two of the irst three contacts so a source of current may be obtained for the solenoid.

In operation, switch control handle 4:0 is rotated to engage the movable contacts with the set of stationary contacts A. Motor 7 which is ureferabiv a three hase induction motor receives current through the contacts and is rotated in a predetermined direction in the usual manner. Motor shaft 8 rotates pinion 9 which in turn drives gear 10 pinion 13, gear 111, sleeve 15 and cable drive 18.

Meanwhile the other two contacts on cylinder 39 have engaged their respective stationary contacts and energized solenoid 36 and thereby released the brake as previously described. By rotating switch handle 40 so thaty they movable contacts are not engaged with either set of stationary contacts, the motor will be stopped and the brake will be autoii'iatically applied thereby'sustaining the load at any desired point. By rotating switch handle 40 to engage the movable con- .tacts'ivith stationaryeontacts B, the motor will drive the cable drum in a reverse direction. In this instance the solenoid will also be energized to automatically disengage the brake when the motor is reversed and apply the brake when the motor is stopped.

Having thus described my invention, what I claim s: Y

A hoisting unit of the character described comprising a base member, a reversible electi'ic motor carried. by said base member and having a shaft. projecting` outwardly therefrom, said shaft having a pinion on its outer end, a sleeve surrounding said shaft and having a gear keyed thereon, a drum surrounding said sleeve and non-rotatably connected therewith, a gear housing depending from said base member and forming a bearing for the outer end of said shaft and sleeve, a pinion shaft journaled in said gear housing and lia-ving a gear thereon which meshes with said pinion on the end of said motor shaft and a pinion mounted on said pinion shaft and meshing with the gear on said sleeve, a bearing block depending Afrom said base member and forming a bearing for the opposite end of said sleeve and through which said moto-r shai't extends, a brake device depending :from said base member and engaging said motor shaft, said brake device being arranged to be mechanically set and electrically released, electromagnetic means for releasing said brake device when the motor is running in either direction and remote coiitrol means for controlling the operation of said motor and brake devices.

in testimony whereof, l hereunto aiiix my signature.

CLAYTON H. HUMAN.

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