US 2354386 A
Description (OCR text may contain errors)
July251944. F. P. LAWLER Az,.,s4,a.e.s
` HoIsT4 Filed May 2o, 1942 INVENTOR FRANK PLLAWLER ATTORNEYS g BYl v Pstented July? 25,- 1944 UNITED STATE 2,354,336 Hors'r Frank P. Lawler, Chicago,-Ill., assignor of onthird toCharles H. Grant, San Francisco,
one-third to Frank P. Lawler, Chicago,
lll., andv one-third to Paul J. r1"ylei", Graville,
This invention relates'to a modification or improx/ementv on'thehoist disclosed in my former-j vPatent'No.2,199,668, entitled Hoist, issued May 7, 1940. v
The object ofthe present invention is generally to improve and simplify the construction and operation of hoists which are especially designed for application to tractors and which are adapttherefrom are outboard lbearings I-l which are supported bythe end wallls or arms of a barrel` like housing extension 8 which is secured to the ed to be driven by the power take-olf shaft of the ,'tractor; to provide a single drum or double drum type hoist in which each drum is controlled by a brake of the brake band type; to provide a hoist in which-power is transmitted from a drive shaft to the drums through eccentric driven differential gears andv in which the gears are fully enclosed lto retain the lubricant 'and to exclude grit and other foreign matter; to provide a hoist in which the drums are journalled at one end by extensions formed on opposite sides of a central drive vgear housing and at'the'ir opposite ends in outboard bearings which also` are carried by the gear housing, whereby cablev or line pull in the drums reacts on-the housing only, and not on the drive shaft; to provide a reduction'gear drive which permits extremely high gear reduction and acompact arrangement of the gears and placement, d the same substantially within the drums; and further, to provide a structure in which the out board bearings and their supports may be utilized,
to anchor and suppOrt the brake bands and the leverswhereby they are actuated.
One form of my invention is illustrated in the accompanying drawing, in which- Fig. 1 is a plan view of a hoist partially in section;
Fig. 2 is a cross section taken on line II-II of Fig. 1; and f Fig. 3 is a perspective view of the eccentric and counter-weight attached thereto.
Referring to the drawing in detail, and particularly to Fig. 1, A indicates in general a drive gear housing, the inner end of which is provided with a ilange 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.
Extending into thev housing A and journalled in bearings mounted therein is a power take-off shaft 3, on. which is secured a bevel gear l. Ex tending through the housing in a direction transverse to the power take-ofi.' is a drive shaft B, and secured thereto is a bevel gear 5 which is in constant mesh with the gear 4. On each side A of the drive gear housing A are sleeve-like extensions 6-8, and aligning therewith and spaced vdrive gear housing A by bolts 9.
. Journalled on the outboard bearings 1-1 andl on the sleeves 6-6 at the points indicated at Ill-I0, Ii--Ii and |2-I2 are a pair of-cable drums I4-I4, and forming a part of each cable drumfar'e brake drums I5-I5. p
Inasmuch as the cable drums are driven in. an ide-nticalkmannen-and the same. mechanism is employed, the description of one will' suilce.r Joumalled within the outboard bearing 1 is a sleeve I6 on which is formed a flange I1 to support an internal ring gear I8. A similar ring gear I9 is securedto the cable drum Ilv and both ring v gears are in constant mesh with a. pair of connected gears I8c ,andullLv which are journalled on an eccentric secured on the drive shaftB power take-off shaft 3 and the bevel gears 4 and l.
The'internal ringv gears I8 and I9, togetherf Iwiththe eccentric y2l) and the connected gears Isc and I8d journalled on the eccentric, form a diierential reduction gear drive, whereby power is transmitted from the drive shaft B to drive the cable drum, but inasmuch as the cable drum is only intermittently driven, and besides that, must. be capable of running vfree to permit the cable to unreel and must also be capable of holding a load when applied to the cable brake drum |5`iormed on the cable drum, it must be provided with aA brake band 28 and a connected brake lever 29 tok free or lock the cable drum..v In addition to this brake drum, a. second brake drum 3 0 is provided, which is secured to the sleeve I8 as at 3|. This brake drum is also provided with a brake band 32 and an operating lever 33. The inner ends of the levers 29 and 33 are pivoted on a common pin 8a secured -in the housing extension.` One end of each brake band is anchored- -on a common pin 8b, secured in the housingrrr extension 8, while the opposite end of each brake band is adjustably secured to the respective levers Y' 29 and 33 by pins` 8c.. Withl this added mecha-. nism the operation will be as follows:
With drive shaft B rotatingif it is desired to haul in on the cable indicated at 35, it is only` necessary for the operator to tighten the brake band 32 by means of the lever 33-and to simuldrum hoist are shown anddescribed.
however, employ a single lever control for the in a direction reverse to the rotation of the-.ec-
` the appended claims, and that the materials centric, and the drive shaft B, upon which it is journalled, and as gear Id is connected or formed integral with the gear I8cit vwi1l rotate in unison n therewith v and as such will drive theljrin-g` gearg-l 9 and the cable -drum to vwhich-,it is secured. reduction in'speed betweenthe'drive shaftBan'd the ring gear I9 will of vcoursefdel'iend on'the ratio,
between the gears IB and I8c, and thA gears I'Idv and I9. 'I'his reduction may readily be one to thirty or greater, and any drum or cable speed may thus be attained.
When hauling in on a load, if it is desiredv to hold a load, the brake band on the drum I5. is apously released, and if it is desired to iet the cable drum run free in order to'pay out'on the cable,`
both brakev bands are released.
f plied and the band on drum so is simuaane-r tive ring gears, a'lbrakeeband for each brake drum, means for, anchorir`ig one end of each brake In the present application, four independently? operated brake drum levers for controlling a tw'o' I may,
four brakedrums as illustrated in my former Patent No. 2,199,668, or employ two lever controls, as shown in my Patentv No. 2,242,193.
In order to retain a plentiful supply of lubricant around thel gears forming the reduction of the gears and eccentric, and the side wall 42.
of the cable drum encloses the other, thusvretaining the lubricant and at the same time'exf jv the drive gear housin'g,-a vpair of levers connected -and finish may be such as the experience of the manufacturer or varying conditions of use may demand.
Having thus described my invention, what I claim and desire to secure by Letters Patent is: 1. In a hoist of the character described, a drive gear housing having a bearing Vextension on one iside, an outboard bearing secured to the housing,
a cable drum journalled on the bearing extension "and on the outboard bearing, a drive shaft Jourcable drum, an internal ringgear secured to the brake drum which is journalled in the outboard bearing, an internal `ringgear secured to the cable'drum, an eccentric secured to the drive shaft, a pair of Aconnevscted gears journalled on the eccentric andinterme'shing with the respecband with relationtothe outboard bearing and with the opposite lends of the brake bands, and means for vpivotally*supporting each lever with relation to the 'outboardbearing vand the drive gear housing.
2. In a -hostbf'nthecharacter described, a
drive gearhousing having a bearing extension n "jon'o'ne'rsidalan outboard bearing secured to the drive, a cover member 40 is secured' to the'cable -f drum, as indicated at Il. This encloses one side; d
housing, avcable drum journalled on the bearing extension and on the outboard bearing, a
' drive shaft journalled in the lbearing extension cluding all foreign matter. 'I'he eccentric driven differential gear, here shown, is preferable,` due to the high reduction ratio it is possible lto obtain, and to the compactness of such a structure, but
other types of reduction gearing, such as planetary gearing or the like, may be employed. The outboard bearing 4l, with the barrel-like extension l, supporting it, are important, as the outboard bearing relieves the drive shaftl B of any cantilever action due to cable pull, thereby have been more or less specifically describedl and illustrated, I nevertheless wish it understood that changes may be resorted to within the scope of and the loutboard bearing `a' brake drum joursecuredto the cable-drum, aninternalring gear secured to-the brakezdrum` which is journalled ingthfoutboard bearing, an internalring gear secured tothe cable drum, an .eccentric secured `to the 'drive'sham a pair of connected gears .-journalled onfthe eccentric and intermeshing with the respective ring gears, a brake band for each brake drum, means for anchoring one end of each brake band with relation to the outboard bearing and the drive gear housing, a pair of levers connected with the opposite ends of the brake bands, means for pivotally supporting each lever with relation to the outboard bearingand the drive gear housing, and a cover member carriedby the cable drum and forming a closure for one side of the gears andthe eccentric, said cable drum forming a closure for the other side to retain Aa lubricant and to Yexclude foreign matter. l