US2199668A - Hoist - Google Patents

Description

F. P. LAWLER May 7, 1940.

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Z4 TTORNEY y 7, 1940- F. P. LAWLER 2,199,668 HOIST Filed Aug. 4, 1937 4 Sheets-Sheet 3 INVENTOR.

FRANK P. LjAWLER A TT ORNE Y May 7, 1940. F. P. LAWLER HOIST Filed Aug. 4, 1937 4 Sheets-Shee t 4 INVENTOR. FRANK P.LAWLER yzwaw, ATTORNEY Patented May 7, 1940 UNITED STATES PATENT OFFICE HOIS'I Frank P. Lawlcr, San Francisco, Calif 'assignor to Charles H. Grant, San Francisco, Paul J. Tyler, Oroville, Calif., and himself Application amt 4,1937, Serial No.-157,317

7 Claims.

the power take-oil shaft of the tractor.

The object of the present invention is to generally improve and simplify the construction and operation of, hoists of the character described; to provide a. double drum type hoist, in which each drum is controlled by a brake of the brake-band type; to provide a hoist in which the brakes, drums and bands are interchangeable; to-provide a hoist in which power is transmitted from a drive shaft to the drums through planetary transmission gears, and in which the gears are enclosed to permit ample lubrication and at the same time exclude dust and grit; to provide a hoist in which the drums are journaled on and supported by extensions formed in opposite sides of a central drive gear housing in such a way that the cable or line pull reacts on the housing and not on the drive shaft; to provide alstructure in which outboard bearings are entirely eliminated, so as to facilitate disassembly or renewal of the operating parts; to provide a double .drum hoist which is controlled by two brakes and two secondary cooperatingbr'akes, and in which the two brakes are normally held in applied position by a single helical tension spring;

and further, to provide a single control lever whereby the brakeand secondary brake of either drum may be selectively released or applied.

The hoist is shown by way of illustration in i 1 the accompanying drawings, in which Fig. 1- is a plan view of the same, partially in .section; I

Fig. 2 is a cross section taken on line 11-11 of Fig. '1; said view showing the brake band in applied position;

Fig. 3 is a similar section showing the brake band in released position;

Fig. 4 is a cross section taken on line IV-IV, Fig. 1;

Fig. 5 is a perspective view of the planetary gear carrier; and

Fig. 6 is a perspective view of the complete hoist.

Referring to the drawings in detail, and particularly to Fig. l, A indicates in general a drive gear housing, the inner end of which is provided with a flange 2 whereby it may be bolted or otherwise secured to a suitable support, for instance,the transmission gear housing of a tractor or the like. and journaled therein is a power take-ofi shaft 3 on which is secured a bevel gear t. Extending Extending into the housing A.

through the housing in a direction transverse to the power take-oft shaft is a drive shaft B, and secured thereonis a gear 5 which is in constant mesh with the gear 4. Formed on each side of the drive gear housing are hub-like extensions 6-6, and journaled thereon are cable drums 'l-Ia. Formed on each drum is an annular brake flange B8a, and secured to each drum is an internal ring gear 8. Journaled on each end gear carrier, consisting of a hub portion H, and annular flanges lZand l2a, said flanges being provided with spaced bearing bosses i3, as clearly shown in Fig. 5. Intermediate of the bearing of the drive shaft, as at- Ill-l0, is aplanetary m bosses are journals Id and journal pins Ma, and 15 rotatable thereon are a plurality of planetary gears [5, which inter'mesh with the internal ring gears 9, and with. sun pinions l6 secured adja-- cent opposite ends of the drive shaft. Bolted, keyed, orotherwise secured on the outer end of the hub members it are secondary brake drums l'|lla, and surrounding said drums l'I-lla. and also the brake flanges 88a of the respective hoist drums are brake bands 8l8a and Ill-Isa.-

The manner of anchoring, ssupporting, and actuating the brake bands is important. Reference will be made to Figs; 2, 3 and 6. First of all, it will be noted that the drive gear housing does not only serve as a. support-for the drive shaft B, the cable drums 1la., and the transmission gears together with their brakes and drums, but it also serves as a support fora bar 'C whicha'functions not only as a support for the several brake bands and their operating mecha- 85 a main downwardly-extending portion 23 and an extension at the upper end which is disposed at right angles thereto, the links being pivotally attached to the latter. This right-angle extension is extended as shown at 25 and is connected by cables 262$a or other flexible means to an arm 21 secured on the shaft 28 journaled on the bearing 29 secured or formed centrally of the anchor bar, said shaft being provided with a main control lever 30 hereinafter to be referred to.

The bearing lugs 20 not only function as supports for the rocker arms 2| but they also serve to support and anchor one end of each brake and secondary brake band, as indicated at 3| in Figs. 2 and 3. The brake and secondary brake bands extend from their point of anchorage substantially around their respective drums, and their free ends are connected through links 32 with the forward ends of the rocker arms 2|. An adjusting nut 33 is mounted on the outer end of each rod or link, to permit adjustment and to compensate for wear, and a. spring 34 is interposed between the free end of the band and a shoulder on the link, to force the bands away from the brakes and secondary brakes when they are released. The brake bands are pivoted at the anchor points, and when they are released, gravitational movement would tend to cause the brake bands as a whole to settle against the faces of the drums indicated at 35. But this is prevented in the present instance by providing downwardlyextending lugs 36 on the anchor bar, which are provided with adjusting screws 31 which limit such movement and maintain uniform spacing and clearance between the bands and the drums when in released position as shown in Fig. 3.

By referring to Fig. 6 it will'be noted that the downwardly extending arms 23 of the common levers are connected by a helical pull spring such as shown at 38, and that the tension applied may be adjusted by turnq-buckles as shown at 39. This spring serves one purpose, to wit, that of normally maintaining the common levers in the position shown in Fig. 6, that is, with the bands l9-l9a applied and the bands l8-l8a released. The position of the bands may however be reversed by operation of the common control lever 30. This is in neutral position in Fig. 6, but by swinging it to the left, a pull will be exerted on the cable or flexible connection 26, causing the links 22 to reverse their position, thereby releasing the band l9 and applying the band l8. It should be noted that when the common control lever 30 is moved to the left the bands l8 and I!) only are actuated, as a pull is exerted on the flexible connection 26 and no pull is exerted on the flexible cable 26a on the opposite side of the crank arm 21. On the other hand, if the lever 30 is swlmg to the right, the flexible connection 26 will remain inoperative, while a pull will be exerted on the flexible cable 26a, thus actuating the links 2| at the opposite ends of the anchor bar, and causing release of the band 19a and application of the band I 8a.

In actual practice, power will be transmitted to the power take-ofi shaft 3 in any suitable manner, and from this shaft it is transmitted through the gears 4 and 5 to the drive shaft 13. If the common control lever 30 is swung to the left, the left-hand cable drum 1 will be driven. This is accomplished as follows: as power is being transmitted to the shaft B, and the planetary gear carrier I0 is being held by the brake band l8, power will be transmitted through the sun pinions l6 thence through the planetary gears l5, from them to the internal ring gear 9 which is secured to the side of the left-hand drum I, thus rotating the same, as the band I9 is free. On the other hand, if the common control lever is swung back to neutral position, band I9 will grip, due to the action of the spring 38, while the band 3 will be released, hence even though power 'is being transmitted through the shaft B, no

power will be transmitted to the drum, as the planetary gears will run free within the ring gear, and the drum I! will dissipate the driving power in free movement. If the right hand drum is to be driven, the operation will be the same, with the exception that the common control lever will be swung to the right.

It has previously been stated thatthe hoist here disclosed is particularly intended for application to tractors. This may or may not be the case, as it obviously may have other applications and uses. However, where it is applied to a tractor, it has certain structural and operating advantages; for instance, in tractors of the socalled caterpillar type, brake bands of the type shown at l8-I8a and l9-l9a are employed for steering purposes. In this instance, the brake and secondary brake bands indicated at l8l8a and l9--l9a are identical to those employed in the tractor, and for this reason are interchangeable therewith, this being an obvious advantage as spare parts carried for the tractor ,may be employed in the hoist. Thus they are not only interchangeable with the brake bands on the tractor but they are interchangeable in the hoist, that is, they may be' moved from one drum to another with alacrity. The two drums indicated at l1-l1a are identical in construction, and as such are interchangeable, and so are the planetary gear carriers, the ring gear, the planetary gears, the sun pinions and the cable drums. A cover plate 42 is secured to each ring gear, and is provided with a felt or other type of oil seal 43, and as such encloses the transmission gears, thereby permitting retention of lubrication about the planetary gears, at the same time excluding dust and grit therefrom. The wear and tear in a hoist of this character is reduced to a minimum, as the planetary mechanism which operates and drives the cable drums is in torque balance at all times, and furthermore there are no direct bending loads on the shaft B, as the entire load on the cable drums is taken up by the extensions 6 of the gear drive housing.

The operation of the hoist is exceedingly simple, as it is controlled from a single lever 30. By throwing it to one side one cable drum will be driven; by throwing it to the opposite side the other cable drum will be driven. By releasing it, it automatically assumes neutral position, in which both drums become locked, while the cooperating secondary brakes simultaneously become released. Last but not least, the entire hoist is quickly applied to a tractor as it is secured on the flange 2, and when secured the entire hoist, together with the anchor bar, becomes an integral part of the tractor and is a self;contained unit for mounting thereon. This permits of the entire hoist unit to be assembled at the factory and adjusted, without further adjustment being necessary in assembly upon the tractor unit. In addition thereto, it will be noted that the entire mechanism of the hoist, including the cable drums, the cooperating brakes, gears, brake bands, anchor bar and actuating mechanism, are all'supported by the drive gear housing and all loads and strains are taken up thereby.

For the sake of simplicity, no provision is shown on the drawings for the introduction of lubrication to the bevel drive gear case, the planetary gear cases or the drums, it being clear, that any standard provision can be made for this. Slmilarly, no type of cable anchorage to the drums has been indicated as any of the well known types of cable anchorage may be employed.

While certain features of the invention have I,

1. In a hoist of the character described, a drive.

gear housing having an extension on one side thereof, a cable drum journaled and entirely supported on the extension, a drive shaft extending through and journaled within the housing, a planetary gear carrier surrounding said shaft, a plurality of planet gears carried by the carrier, a ring gear on the cable drum with which the planet gears intermesh, a driving pinion on the drive shaft also intermeshing with the planet geara'a band-actuated brake drum for securing the cable drum against rotation, a second bandactuated brake drum for securing the planetary gear carriefagainst rotation and means for applying one brake band and releasing the other to drive or look the cable drum, and a cover member carried by the cable drum and forming a closure for one side of the gears, said drum forming a closure for the other side of the gears to retain a lubricant and to exclude dust.

2. In a hoist of the character described, a pair of cable drums, a brake and a secondary cooperating brake for each drum, a common spring normally holding both brakes in locked position to prevent rotation of the drums and simultaneously holding both secondary brakes in disengaged position, a pivoted control lever adapted to be ,swung from a neutral inoperative position to one side or the other, a lever connecting each brake and its cooperating secondary brake, said levers being connected with the common spring and being normally held in a position where both brakes are applied and the secondary brakes held in disengaged position; and a flexible con nection between each of the last-named levers and the control lever whereby when the control lever is swung to one side, one brake and cooperating clutch is actuated, and when swung to the other side the other brake and cooperating clutch is actuated.

3. In a hoist of the character described, a drive gear housing having a bearing extension on each side thereof, a cable drum joumaled and entirely supported by each bearing, a drive shaft extending through the housing and bearings, a planetary gear transmission for each drum whereby poweris transmitted from the'drive shaft to each drum, a brake and a secondary cooperating brake for each cable drum whereby the transmission of power is controlled, said brakes and secondary brakes being band-actuated, an anchor bar secured to the drive gear housing, and means on said bar for securing one end of each brake bandf and for supporting the bands, said anchor bar absorbing the operating reaction of the bands.

4. In a hoist-of the character described, a pair of cable drums, a brake drum secured to each cable drum, a brake band for each brake drum, a planetary gear transmission for each cable drum, a brake drum secured to each planetary gear transmission, a brake band for each of said last named drums, a common spring normally applying the brake bands to the brake drums which cooperate with the cable drums to prevent rotation of said cable drums, said spring simultaneously maintaining the brake bands on the drums which cooperate with the planetary gear transmissions in released position, a pivoted control lever adapted to be swung from a 6 neutral inoperative position to one side or an-' other, a pair of levers, one lever being connected with the respective brake bands whereby one cab e drum and planetary gear transmission is ac,-

tuated, and the other lever being connected to 10 the respective brake bands whereby the other cable drum and planetary gear transmission is actuated, and said levers being connected with said common spring and-being normally held in a position where both the brake bands holding the cable drums against rotation are applied, and the. brake bands actuating the planetary gear transmissions are released, and a flexible connection between the control lever and the pair of levers, whereby when the control lever is swung to one side or the other the brake band securing the cable drum on that side is released, ahd the cooperating planetary gear transmission brake is applied, and when the control lever is returned to neutral, the normal position of the brake bands is restored by the common spring.

5. In a hoist of the character described, a pair of cable drums, a brake and "a secondary cooperating brake for each drum, a common spring normally holding both brakes in locked position to prevent rotation of the drums and simultaneously holdingboth secondary brakes in disengaged position, a pivoted control lever, a connection between said lever and the respective brakes 8t? and secondary brakes, said lever adapted to be swung from a neutral inoperative position to one side or the other, said movement from neutral position in one direction first causing release of one brake, and further movement in the same 40 direction engagement of the cooperating secondary brake, and movement from neutral position in the opposite direction causing the same actuation of the other brake and secondary brake.

6. In a hoist of the character described, a drive thereof, a cable drum 'journalled and entirely supported on the extension, a drive shaft extending through and journalled within the housing, a planetary gear carrier surrounding said shaft, a plurality of planetary gears carried by the carrier, a ring gear on the cable drum with which the planetary gears intermesh, a driving pinion on the drive shaft also intermeshing with gear housing having an extension on one side the planetary gears, a band-actuated brake drum for securing the planetary gear carrier against rotation, a cooperating brake band and means for applying one brake band and releasing the other to drive or look the cable drum, and means I on said carrier forminga closure for one side of the planetary gears, said drum forming a closure for the other side of the gears to retain a lubricant and to exclude dust.

7. In a hoist of the character described, a drive gear housing having an extension on one side 35 thereof, a cable drum journalled and entirely supported on the extension, a'drive shaft extending through and journalled within the housing, a planetary gear carrier surrounding said shaft,

rier, a ring gear on the cable drum with which the planetary gears intermesh, a driving pinion on the drive shaft also intermeshing with the planetary gears, a band-actuated brake drum for a plurality of planetary gears carried by the carsecuring the planetary gear carrier against roand to exclude dust, an anchor member secured to the drive gear housing, and means on said anchor member for anchoring and supporting the bands and for absorbing the operating reaction of the bands.

FRANK P. LAWLER.

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