US2244221A

US2244221A - Electric hoist

Info

Publication number: US2244221A
Application number: US236037A
Authority: US
Inventors: Charles S Schroeder
Original assignee: Yale and Towne Manufacturing Co
Current assignee: Yale and Towne Manufacturing Co
Priority date: 1938-10-20
Filing date: 1938-10-20
Publication date: 1941-06-03
Anticipated expiration: 1958-06-03

Description

June 3 w43. c. s. SCHROEDER ELECTRIC HOIST HIM. n Hvll INVENTOR BY //q//fR ATTORNEY 5m@ 3 WM. c. s. SCHROEDER ELECTRIC HOIST Filed OCT.. 20, 1938 3 Sheets-Sheet 2 zal# ' INVENTOR Ca/Lof/QWQ ATTORNEY .Fume 3, 1941. c. s. scHRoEDER ELECTRIC HOIST Filed Oc. 20, 1938 3 Sheets-Sheet. 5

lNvENToR Wgfacoh ATTORNEY Patented June 3, 1941 1 ELECTRIC nors'r Charles S. Schroeder, Philadelphia, Pa., assignor D to The `Yale & Towne Manufacturing Company, Stamford, Conn., a corporation oi' Connecticut Application October 20, 1938, Serial No. 236,037

s claims. (ci. 25a-16s) This invention relatesv to an electric hoist of the type in which a rotating drum winds and unwinds a steel cable.

The basic elements of my hoist are old, as is also the basic arrangement. The novelty in my construction resides mainly in the particular arrangement of the power means relatively to the rotating drum whereby all of the gearing is mounted in a single chamber, and is adapted to be driven in lthat chamber by a driving shaft connected to an electric motor.

A further feature of novelty in my invention is the arrangement of the braking means so that they may be readily accessible and may be cooled during the operation of the hoist. The means whereby the braking means are cooled forms also an important feature of my contribution.

For a description of my invention, I shall refer to the drawings wherein Fig. 1 is a partial longitudinal section of my hoist. Fig. 2 is avertical section through my hoist along lines 2 2 of Fig. 1. Figs 3, 4, 5 and 6 are sections taken along lines 3 3, 3 3, 5 5 and 6 6 respectively of Fig. 1. The various sections of Figs. 3,4, 5 and 6 represented in Fig. l are shown by lines I i in the said figures.

Referring now more particularly to the drawings, my hoist utilizes a central supporting member i having two pairs of eyes il traversed by bolts i2 whereby the hoist may be supported from plates i3 of a trolley assembly i3 (Fig. 2). The central supporting member i3 has secured thereto at one end by suitable means, a casing l terminating in what I prefer to call a partition I 6. At its other end, the central supportingI member iii has secured thereto a casing il terminating in what I prefer to call a partition member i8.

Supported within the casing Il is a motor of conventional type. This motor has a main shaft i9 supported in a suitable bearing 20 carriedby the partition i8, the drive shaft being coupled at 20 to a further drive shaft 2l, the shafts I9 and 2l being termed by me a drive shaft assembly. It is obvious that different shaft connections may be used if desired. The shaft 2i traverses a drum supporting sleeve 22 which is mounted in a bearing 23 on the partition i6 at one end thereof, and a bearing 2t on the partition I3 at the other end thereof. The winding drum 25 of my hoist is keyed at 28 to the sleeve 22 for rotation together therewith. Secured to the casing Ai5 is a further casing portion 2l to which in turn is secured the end cover 28a of the hoist.

Through the cooperation of casings i5 and 21, there is formed a gear chamber, designated generally by the reference numeral 28. Within this gear chamber there is adapted to rotate the gear wheel 23 keyed to one end of the sleeve 22 lon which the drum 25 is mounted. This gear Z9 is driven by a pinion 33, also within the gear chamber, which pinion is in turn driven by a series of gears through the intermediary of a Weston type of brake and drive mechanism, designated generally by the reference letter W in Fig. 1, and comprising the usual ratchet 3i,

pawl 32, friction disk 33, and internally threaded gear wheel 33.

The internally threaded gear wheel 34 is mounted about the threaded shaft 35, and is adapted to be driven by the pinion 36 formed on the drive shaft 3i. Those skilled in the art will appreciate that when the drive shaft 2l is rotated in one direction, the internally threaded gear 34 mst moves on its screw threads 35 to bind itself to the friction disk 33, and then through the friction disk 33 drives the gear mechanism, to the end that the sleeve 22 shall be rotated in a direction to wind the cable about the drum 25.

Rotation of the ratchet 3i in a reverse direction is prevented by the pawl 32, so that when it is desired to lower the load, it is necessary to create a slipping action between the friction disk 33 and the ratchet 3i, which is made possible through the screw threaded relation between the internally threaded gear 34 and the shaft 3.5. When the load seeks to run ahead of the gear 3d, there will be a binding of the gear 36 to disk 33 and the pawl 32 will prevent further movement, thus preventing the lowering action of the drum. This action is well known in the art and need not be described in more detail here.

To further control the load, the end of the drive shaft 2l has secured thereto a brake drum 3l with which cooperates a pair of brake shoes 3B, best shown in Fig. 5. These brake shoes are normally pressed in a braking direction by springs 33, and are adapted to be moved out of braking relation to the drum 3l against the springs 39 upon rotation of a cam 40 fitting between a pair of abutments 4i extending from each of the brake shoes 38.

Mounted within the casing 21, there is an electromagnet 42 equipped with an armature 43 connected with a lever dt which in turn is secured to the shaft 45 integral with the cam 40. When power is applied to the electromagnet t2, which is the case whenever the lifting motor is shaft 2|.

The.. construction of the brake drum 31 is' novel, its inner surface having formed thereon fan blades 46 which draw air through louvres 41 in the casing cover 28a. This air is forced over the solenoid 42,.the brake drum 35, brake shoes 38, and the outside of the gear casing 28. The air blast leaves the hoist through opening 41a in the casing 21, as is apparent. Those skilled in the art will bestappreciate the merits of this l design. The brake drum, in addition to the blades 46, has a series of reinforcing spoke-like portions 46a.

As shown in Fig. 2, rotation of the drum 25 winds hoisting cable 48 which extends through a load sheave 49, and then is secured at 50 to the central supporting member ill. The controller casing 5| contains suitable electrically operated controlling mechanism actuated by push buttons 52 and E3 supported by a downwardly extending arm or cable 54. A lever 55 is pivoted at 56 to the -controller 5I and is adapted when contacted by the sheave i9 upon the movement of the sheave to an elevated position, to shut oii' the power through operation of one ofthe means in the controller casing, all as will be apparent to those skilled in the art.

I now claim:

1. In an electric hoist of the class described, a hoisting drum, a sleeve supporting-said drum and to which said drum is fixed, a partition on each side of said drum, a motor secured to one partition and having a. drive shaft assembly passing through said partition, said sleeve and said second partition, bearing supports for said sleeve on each of said partitions, a gear housing and .a brake housing supported from said second partition and separated from one another, said brake housing having a portion thereof vertically superimposed relatively to said gear housing and complementary thereto whereby to form a cylindrical casing therewith, spur gearing in said gear housing driven by a spur gear on said drive shaft also in said spur gearl housing, a gear on said drum supporting sleeve positioned also in said gear housing and driven by said gearing whereby to rotate said drum, a brake drum on the end of said drive shaft rotatable at the end of said brake housing, a braking shaft mounted in that portion of said gear housing superimposed and complementary to said brake housing for rotation parallel to said drive shaft, a portion of said shaft extending into the end of the brake housing adjacent said brake drum, Ia solenoid also in the said superimposed portion of the gear housing for rotating said shaft, and a .brake band for said drum actuated by rotation of said shaft.

2. In 'an electric hoist of the class described, a hoisting drum, a sleeve supporting said drum and to which said drum is fixed, a partition on each side of said drum, a motor secured to one partition and having a drive shaft assembly passing through said partition, said sleeve and said second partition, said sleeve having bearing supports on each of said partitions, a gear housing and a brake housing supported from said second partition, spurl gearing in said gear housing driven by said drive shaft, a spur gear on said'drum supporting sleeve positioned in said gear housing and driven by said gearing whereby to rotate said drum, a brake drum having a fan-like construction secured on the end of said drive shaft assembly for rotation in said brake housing, and an end plate for said housing juxtaposed to said brake drum and having openings through which air is forced into said brake housing by rotation of said brake drum.

3. In an electric holst of the class described, a hoisting drum, a sleeve supporting said drum and to which said drum is xed, a partition on each side of said drum, a motor secured to one partition and having a drive shaft assembly passing through said partition, said sleeve and said second partition, mid sleeve having bearing supports on each of said partitions, a gear housing and a brake housing supported from said second partion, spur gearing in said gear housing driven by said drive shaft, a spur gear on said drum supporting sleeve positioned in said gear housing and driven by said gearing whereby to rotate said drum, a brake drum having a. fan-like construction secured on the end of said drive shaft assembly for rotation in said brake housing and an end platefor said housing juxtaposed to said brake drum and having openings through which air is forced into said brake housing by rotation of said brake drum, there being a further opening in said brake housing through which said air is exhausted.

4. In an electric hoist of the class described, a hoisting drum, a partition on each side of said drum, a motor secured to one partition and having a drive shaft assembly passing through said partitions, sai'd drum having bearing supports on each of said partitions, a gear housing supported from said second partition, a brake housing supported from said gear housing and terminating in a circular end cover, gearing in said gear housing driven by said drive shaft to rotate said drum, a brake drum having a fan-like construction secured on the end of said drive shaft assembly for rotation in said brake housing in juxtaposed relation to said end cover, the said end cover for said brake housing having openings through which air is forced into said brake housing by rotation of said brake drum and a further opening through which said air escapes from said housing.

5. In an electric hoist of the class described, a motor, a motor driven shaft, a hoist drum, gearing driven by said shaft to operate said hoist drum, a brake drum secured. to one end of said shaft, brakes shoes for said brake drum, operating means for said brake shoes, a housing for said brake drum, said shoes andl operating means, a circular opening in said brake drum, a series of fan blades protruding from said brake drum into said opening, a circular opening for said brake drum housing concentric with said brake drum opening, a series of louvres for said housing opening, the rotation of said brake drum by said shaft pulling air into said brake drum housing through said housing opening, and a further opening in said housing through which Said air is expelled from said housing.

6. In an electric hoist of the class described, spaced first and second main plates, a sleeve supported on'said spaced main plates and extending beyond the first of said plates, a lgear casing plate secured to the said first plate and forming there- 2,244,221 -with a gear casing having an upper relatively narrow chamber and a lower full chamber. a spur gear secured about said sleeve and rotating partially in said narrow chamber and partially in said full chamber, a motor housing secured to the second of said main plates, a motor in said housing, a drive shaft extending from said motor and through said sleeve into said gear chamber and protruding beyond said gear chamber through said gear casing plate, a spur gear on said saft within said gear casing, gearing in the lower m11 chamber of said gear casing adapted to be driven by said shaft spur gear and adapted to rotate said sleeve spur gear, a hoist drum Secured on said sleeve between said main plates, a

CHARLES S. SCHROEDER.