US2681205A - Hoist - Google Patents

Description

June 5 H. v. BANNISTER ETAL 2,681,205

HOIST Filed June 29, 1950 4 Sheets-Sheet 2 x 7 Q l Harold 1582222119251 A/our a C Si k/vi ATTORNEYS INVENTORS June 15, 1954 H. v. BANNISTER ET AL 2,681,205

HOIST 4 Sheets-Sheet 3 Filed June 29, 1950 Harald fianmsl flmll'd C szzw J ATTORNEYS Patented June 15, 1954 UNITED STA @TENT OFFICE Waverly, Iowa,

assignors to Schield Bantam Company, Waverly, Iowa, a corporation of Iowa Application June 29, 1950, Serial No. 171,082

7 Claims.

This invention relates to hoists.

While the hoist may be used for other purposes, the same is ideally adapted for use in connection with earth handling and moving machines and particularly where the said machines are of the portable or mobile nature. In connection with the said machines, the hoist of the present invention is readily adaptable for association with operating elements or structural features of the machine for raising and lowering the boom which is a conventional adjunct or structural characteristic of certain types of earth handlin and moving machines.

The general type of earth moving and handling machine with which our hoist is very effectively utilized is disclosed in the patents to Schielct 2,402,299, June 18, 1946 and 2,405,981, August 20, 1946. In both of these patents, the machines are mobile and they include suitable associated and cooperating mechanisms and devices whereby the earth handling and moving mechanisms are mounted on a rotatable platform and such platform is, in turn, secured to or carried by the chassis of the vehicle. f'his platform may be rotated by certain swing shaft mechanism and, of course, suitable means are employed to position the platform with respect to the vehicle so that the boom that is usually mounted at one end of the platform can be disposed either from the rear end of the same or from either side thereof in order to perform the earth moving and handling functions. While we have mentioned the Schield patents, our hoist, of course, can be used in connection with any type of mechanism Where it will perform the function of uniquely payin out and winding a cable on a drum as will be seen from the hereinafter detailed description.

In the hoists that have been utilized in connection with prior earth moving and handling machines and similar hoisting functions, there were certain disadvantages present in such hoists; namely, the hoists Were so constructed. that there was no power applied thereto, particularly in the lowering operation of a boom for an earth "moving machine or the like and thus the drum on which the cable is payed out and wound thereupon could not be properly or eiiectively controlled particularly .in the lowering operation of :a boom or the like. contrasted with the aforesaid disadvantages of prior hoists, in the present hoist, there is power applied for lowering as well as for raising of the hoist and, when the hoist is used in conjunction or combination with other mechanisms and devices which cooperate in an earth moving and handling machine, this power lowering as well as power raising is accomplished at the same time that the operator is swinging the platform on which the mechanism rests or during the hoisting or any other operation. Therefore, it will be seen that there is a distinct advantage in providin the power lowering as well as raising of a boom that is attached to the rotatable platform of an earth handling or moving machine.

There are other disadvantages in the prior boom hoist mechanisms for earth moving and handlin machines; namely, that the raising and lowering of the boom could not be controlled as regards the speed of the raising and lowering and this resulted in an inaccurate positioning of the boom; whereas, in utilizing the present hoist, or hoisting mechanism, the boom is raised and 1owcred at controlled speeds and this is particularly effective with regard to raising and lowering of the boom when the same has a power shovel attached to the dipper stick or when the machine is used as a crane where accurate positionin of the boom is desirable. In addition, the present hoist or hoisting mechanism where space is at a premium, particularly in the shovel and crane construction, the machinery must be such as to prevent dust and gritty substances from entering the hoisting mechanism, and to overcome this situation, the present hoist is so constructed that dust and gritty substances cannot enter or seep into the mechanism and prevent its effective functioning at all times. Then, too, in the present hoist, the same is constructed so that the rate of raising and lowering the boom is properly controlled in order to accurately position the object bein hoisted at a certain or predetermined distance from the crane.

Moreover, the present hoist is so constructed that :it is absolutely safe in use and is a protection against workers in and about the earth moving and handling machine in that means is provided to maintain the hoist under control at all times and prevent slippage of the mechanism comprising the hoist.

The present hoist is ideally adaptable as a boom hoist on a crane or shovel but, as aforesaid, is effectively used for other hoisting applications. This boom hoist is built as .a complete unit and is insertable as such in the rotatable platform of a machine for handling and moving earth and 3 readily fits into the combination with the other elements on the said platform and cooperates therewith in the effective complete organization of elements for performin the intended functions of the machine as a whole in an improved manner.

Additionally, the present hoist is of simple construction and comprises a relatively few number of cooperating elements and the construction is such that if service and repairs or replacement of any of the parts is necessary, this may be readily accomplished.

In view of the foregoing, therefore, it is an object of our invention to provide a hoist or hoisting mechanism wherein there is suitable means provided for accurately controlling the rate of raising and lowering a boom of an earth moving and handling machine.

Another object of our invention is to provide a hoist or hoisting mechanism comprising means for accurately controlling the rate of paying out and winding 2. cable on a drum of the said mechanism during a hoisting operation.

Another object of our invention is to provide a boom hoist for earth moving and handling machines or the like wherein the hoist is power controlled in lowering the boom as well as raising the boom.

Another object of our invention is to provide a boom hoist wherein there is a smooth opera- 1 tion of raising and lowering of the boom by means of the hoist and the result being a precision positioning of the earth or whatever is to be hoisted or moved.

Another object of our invention is to provide a boom hoist wherein power is controlling in the lowering of the hoist as well as in the raising of the hoist or wherein the drum on which the cable that raises and lowers the hoist may be disengaged from the source of power and the weight of the boom serves as a means of effecting the lowering thereof and the control of the lowering of the boom is under a braking operation.

Another object of our invention is to provide a boom hoist mechanism that consists of a unitary structure that may be bodily employed as such in conjunction with other component elemerits of an earth moving and handling machine or the like.

Another object of our invention is to provide a hoist comprising a unitary structure which is self-supporting and is so constructed as to exclude dust, gritty substances, etc. and is adaptable as a unit to be associated with other cooperable elements or units.

A still further object of our invention is to provide a hoist or hoisting mechanism which consists of a relatively few number of component cooperative elements which may be readily applied and replaced and the unit readily serviced and relatively inexpensive.

With the above and other objects in view, the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claims hereto appended, it being understood that various changes in the form, proportions, and minor details of construction, within the scope of the claims, may be resorted to Without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings:

Fig. 1 is a side elevational view of our hoist 4 embodied in conjunction with other suitable mechanism mounted on a rotary platform or table of a mobile earth moving and handling machine;

Fig. 2 is a perspective view of the unitary hoist or hoisting mechanism removed from its environment as shown in Fig. 1, this view showing an idler pinion rotatably mounted in a modified manner;

Fig. 3 is a sectional view showing certain parts in elevation taken substantially along the lines 33 of Fig. 4 looking in the direction of the arrows;

Fig. 4: is a side elevational view of one end of the hoist or hoisting mechanism;

Fig. 5 is a partial sectional view taken substantially along the lines 55 of Fig. 4 looking in the direction of the arrows;

Fig. 6 is a side elevational view of the other end of the hoist or hoisting mechanism;

Fig. 7 is a vertical sectional view taken substantially on the line 1-1 of Fig. 4; and

Fig. 8 is a diagrammatic view in perspective showing a jaw clutch mechanism.

The invention will be more readily understood by referring to the drawings in detail wherein the same reference numerals or characters in the several figures thereof all denote the same component elements or parts.

With particular reference to Fig. 1 of the drawings, there is disclosed a mobile earth moving and handling machine which is denoted generally at ID. This type of machine is shown in the patents supra. The earth moving and handling machine comprises a motor vehicle II, the conventional vehicle chassis [2, front wheels [3 mounted on a suitable axle I l and the dual rear wheels [5 which are likewise mounted on suitable axles Hi, the aforesaid axles, of course, being properly connected with and supported by the chassis in the conventional manner. In lieu of the dual rear wheels or single rear wheels as the case may be, of course, a half track mechanism might be employed along with the front wheels i3 01', in lieu of the said front wheels l3 and the dual rear wheels 5-5, a complete caterpillar mechanism or crawler mechanism may be substituted therefor.

Generally, the earth moving and handling mechanism consists of a rotatable platform ll which is suitably anti-frictionally rotatably mounted in a circular bearing like structure l8, a part of which is carried by the chassis of the vehicle and the other part by the underside of the platform. Suitable means are provided to maintain the two said parts 18 in interengaging and rotatable relationship with respect to each other. On the top surface of the platform ll and usually adjacent one end thereof, a suitable gasoline engine l9 having an outwardly extending power shaft 20 is positioned. This shaft 29 has a sprocket gear 2! attached at or adjacent the end thereof. There is a sprocket chain 22 which engages over an enlarged drive sprocket 23 which is mounted on a shaft 2d and, on that shaft, there is a smaller gear 25. This gear 25 is in constant engagement with a larger gear 25 mounted on shaft 21 and, in turn, this large gear 26 is in constant mesh with a relatively smaller gear 28 mounted on shaft 29 and on which shaft there is still a smaller gear 30. This smaller gear 30 is in constant engagement with a relatively small idler gear 3! and which idler gear is, in turn, in constant engagement with a much larger gear 32 which is one of the g. gears of the present hoist or hoisting mechanism.

The shaft 21 is the drum shaft upon which the cable is wound or payed out. The shaft 29 is the swing shaft which has mounted thereon suitable beveled gears etc. which effect the swinging or rotation of the platform I! with respect to the chassis it.

The said gear 32 is mounted on a shaft 34 and this is the shaft of the hoist or hoisting mechanism which effects the winding in of the boom hoist raising and lowering cable 35 or the paying out of this said cable.

The boom hoist or hoisting mechanism is denoted generally at 35', see Figs. 2 and '7. This boom hoist consists of the said shaft S -i and which shaft is rotatably mounted adjacent each end thereof in suitable bearings 38 and 37 which surround and engage opposite end portions of the said shaft. Each of the said bearings 35 and 3? are concentrically disposed within a hearing housing 38 and these bearing housings are fixedly secured. to and carried by end brackets or supports 39 and 40 and which supports are integral with or connected to a transversely extending base ll. The bearing housings 38 may be of the single enclosed type or of the two-part type, whichever is desired.

The idler gear or pinion 3| may be rotatably supported in position for meshing with the gear 32 by an arm 39 projecting horizontally from the bracket 59, as shown in Figs. 1 and 6, or by brackets 39 carried by and projecting upwardly from the base ll as shown in Fig. 1.

The shaft 34 is provided inwardly of each end thereof and substantially centrally with longitudinally extending lubricating passages or bores 52 and s3 and each of these bores connects with or terminates in at least one radially outwardly extending bore or lubricating passageway M and d5 for a purpose later described. Suitable lubricating cups 46 are screw threadedly engaged in the opposite ends of the shaft 34 and in alignment with the lubricating passages t2 and 33. The bearing housings 38' are also provided with lubricating passages 41 which register with a lubricating opening or passage 48 in the bearings and ti and lubricating cups 49' are screw threadedly secured in these said passages ll.

Adzacent the end of the shaft 34, the same is provided with a circumferential recess 5| and, e

in this recess, there is positioned a slit or other retaining ring 52 inwardly of which there is a washer that surrounds the shaft.

Adjacent and in contact with the other end 54 of the shaft, there is an enlarged washer 55 which has a central opening therein and this opening is in registry with a screw threaded opening 55 which communicates with the lubricating passageway 42. Into this opening there is screw threaded a bolt 5's having a central opening 58 therein and which opening also, of course, communicates with the lubricating passageway 2 and, in this opening, the screw threaded lubricating cap or fixture 4 6 is engaged and the bolt 5! is held in its screw threaded engagement by means of a lock'washer 59. Thus, with the retaining means 52 at one end of the shaft and the washer 55 and the bolt at the other end of the shaft and the fact that the shaft is positioned in the bearings 36, and which bearings are within the fixed bearing housings 38, that are in turn carried by or affixed to stationary brackets, the said shaft 34 is allowed to be rotated as will be hereinafter seen but is prevented from any lateral or longitudinal dis- 6 placement with regard to the bearings and/or brackets, of course.

The gear 32, which has the complete series of gear teeth 96 on its periphery, includes the spokes 6i which are preferably integral with a substantially tubular hub 62. This hub 62 or rather the opening 63 therein is of substantially the same diameter as the diameter of the shaft 3d and is positioned thereon adjacent the end 54 of the shaft. The hub 62 of the gear 32 includes a longitudinal keyway 64 and, opposite this keyway, there is a similarly formed keyway G5 longitudinally of the surface of the shaft 34%. The two keyways 64 and 65 are aligned and a gib key 66 serves to connect the gear 32 to the shaft 34. As will be seen, one end 61 of the tubular hub abuts or is closely adjacent the inner end of the bearing 3'! and the bearing housing 38 while the other end 68 of the said hub has positioned thereagainst the anti-friction bearing 69 which surrounds the shaft 3 3.

The cable winding portion of the hoist or hoisting mechanism is denoted generally at it and includes radially spaced flanges TI and '52 which flanges are integral with the drum portion '53 upon which the cable 35 is wound or payed out. Stating it another way, the winding drum for the cable includes the spaced flange portions ii and 72 thereof that are' integral with the drum portion 73 upon which the cable is wound or unwound. The outer periphery M of the flange ll isin the form of a series of spaced outwardly extending lugs 15 providing spaces 18 therebetween and into which spaces the drum locking dog 71?, which is pivotally' mounted at it on fixed brackets 19, is engaged to locls this drurn as hereinafter described in detail.

An opening 39 is provided in the face of the flange ii and through this opening the extreme end 350. of the cable 35 is passed and is secured by means of a locking collar 81 which is of greater diameter than the opening 813' and thus the and 35a of the cable is prevented from being disconnected from the drum or, more specifically, from the flange H of the drum. This flange H is in the form of a disc slightly concavo convex and is provided with a series of openings 82 to provide lightness and ventilation and, as aforesaid, it is integral with the drum portion it. This drum portion i3 is'integral with the said flange 72 or vice versa and this flange 12 has integral therewith and extending radially outwardly therefrom a ring-like brake drum 83 and this flange i2 is also provided with a series of openings 84 therein. Concentrically disposed within the brake drum 83 there is a ring gear 85 having teeth 86 thereon which are beveled and includ ing a flanged central portion 87 with an opening 88 therein. The flange portion 8-! is provided with a plurality or series of spaced openings 8'23 which register with screw threaded openings 59 that are provided in the end wall 9! of the drum portion 33 of the winding drum. Suitable screw threaded bolts 82 pass through the openings 89 in the flange of the beveled ring gear that are registered with the screw threaded openings fit and these bolts serve to effectively secure the ring gear 85 to the winding drum I3. The winding drum including the flanges H and 12 and the drum portion proper 73" is concentrically disposed about the shaft 34 substantially intermediate the ends thereof and is positioned on spaced bearings 93 and 94 and which bearings are also concentrically disposed with respect to the drum portion 13' of the winding" drum.

The beveled ring gear 85 along with the two oppositely disposed beveled pinions 95 and 96 and another beveled ring gear 9?, constitute a planetary gear drive mechanism for the hoist. This planetary gear drive consists of a tubular hub portion 98 which is concentrically disposed about a tubular bearing 93 that is mounted on the shaft 34 and the hub and bearing are free on the said shaft. The hub has outwardly radiating sockets I60 and IIH and these sockets each have bores I02 therein and each of which bores communicate with the bearing 99 by means of a reduced opening or passage 93 for lubrication purposes later described. Elongated pins I04 and I65, with one end of each of the pins positioned in the said bores I02, constitute supports or mountings for the beveled pinions 96 and 95 respectively. The pins Hi4 and I35 are each provided with a longitudinal passageway I98 that opens at the end thereof which is dis- 2 posed in the sockets, and this passageway Hi6 terminates in a laterally extending opening or passage I61. The said passageways in the pins its and IE are for lubrication purposes later referred to. As seen, the bevel pinions 95 and 96 are mounted on and rotatably supported on the pins I65 and IE4 respectively. These pinions are each provided with a central opening iB'B, and a cylindrical bearing IE9 is positioned and maintained in the openings of each of the bevel pinions, and, of course, the bearing Iiie is concentrically disposed about the pins inwardly of the ends thereof. The outer ends of each of the pins I04 and I95 are mounted in recesses or openings III] in outwardly extending arms III, which arms are preferably integral with a spider H2 and which spider is substantially circular in outline and, at its peripher H3, is in the form of a circular ring like brake drum H4, which brake drum is commensurate in cross sectional dimension and diameter with the brake drum 83.

The bevel ring gear 9'! includes a peripheral rim portion I I5 which is in the form of a circular series of ratchet teeth H6. This ring gear fii includes a tubular hub portion II? which includes a longitudinally extending keyway H8 therein, and which keyway is in registry with a longitudinally extending keyway I IS in the shaft 3%. A key I29 that is positioned in the registered keyways H8 and H9 serves to secure the ring gear 9'1 to the shaft 34 so that it will rotate with this shaft.

The spider H2 is provided on its face portion l2i with a spaced series of outwardly extending integral bosses I22, there being four of such bosses I22 and each of which are of identical formation and each of the bosses has a trans versely extending opening I23 therein. Suitable pins 1%, having one end thereof I25 exteriorly screw threaded and the other end in the form of an enlarged cylindrical head I26, serve as a mounting means for a series of similarly formed pawls P, which pawls each include an en larged end 22?, and each of which ends of these pawls is provided with an opening I28 that is of substantially the same diame er as the cross sectional diameter of the enlarged head I25 of the pins I23 and these heads serve as the mounting means for the pawls P which from their enlarged head portions are of substantially arcuate form as denoted at I29 and each of which pawls includes a rounded free end portion I36, which rounded free end portion is similar in shape with and corresponds to the rounded recesses I3I that alternate with each of the ratchet teeth H6. The pawls P are held on the pins I24 by means of a washer I32 that is positioned on the outer faces thereof, and the cotter keys I which pass through an opening I34 in each of the heads 25 of the pins I24. These pins I2 1, in turn, are maintained in their association with the spider H2 by means of an interiorly screw threaded nut I35 which engages the exterior screw threads I25 on the end of the bolt and a suitable lock washer I36. A description is given of only one of the pawls and the mounting thereof as the other three pawls, or whatever remaining number there may be, are identical. Each of the pawls P has secured on its arcuate portion I29 a fixed laterally extending stud $37, and the spider adjacent and to one side of the bosses I22 is provided with fixed laterally extending studs I38. These studs I37 and I38 serve as a means for attachment of the respective ends I39 and I lIi of a coil spring S and this coil spring S therefore tends to normally urge the rounded or free ends I30 of the pawls P into the rounded similarly formed recesses I3! in the ratchet gear H5 which is integral with the ring gear ill. The pawls P operate in conjunction with the ratchet gear H5 in pairs. These pairs of pawls are diametrically oppositely disposed on the spider II2 and the said pairs of pawls are denoted as PI and P2 respectively.

Suitable brake bands Hii and I42, each of which bands are provided with an inner friction surface F, substantially surround the brake drums 83 and H t respectively. One end hi3 of each of the said brake bands 5M and M2 is preferably turned back upon itself or reversely bent as shown in Fig. 4 and is affixed to a bracket B that is secured to the base dI of the hoist or any other fixed surface. The free ends Hi l of each of the said brake bands is provided with an attaching flange M5 and which flange is connected with conventional brake band operating and applying means, not shown. This brake band applying and operating means may consist of a linkage system connected with each of the said brake bands and either a treadle or handle for operating same in the usual way.

As hereinbefore stated, the shaft 29 is rotatable, see Fig. 8. This shaft carries the gear 39 loosely thereon and this gear on one face thereof is in the form of a portion of a jaw clutch 3G. The other portion constituting the entire jaw clutch C is slidably keyed to shaft 29 and rotates therewith. This slidable portion C of the jaw clutch has a clutch operating collar C engageable therewith and this collar has connected therewith a. lever or the like L by means of which the slidable part of the clutch C may be moved into and out of engagement with the clutch portion 3Ii on the pinion 39, for a purpose later referred to.

Specifically, with regard to the lubrication system for the hereinbefore mentioned bearings and the rotatable shaft 34, it is obvious that a lubricant may be injected into the cups .9 for the bearings 36 and 31 and that, likewise, a lubricant may be injected through each of the cups 36 at the ends of the shaft 34 and this lubricant will travel in the lubricating passageways 42 and A3 and outwardly through the lateral passages M and 45 and thus effect a thorough lubrication of the bearings 89, 93, 9A and 99 and, too, these bearings 99 have small openings therethrough which register with the openings H33 in the sockets I00 and IOI and, the lubricant thus passes into the passageways Hi6 and the lateral passageways in the respective supports I and I05 for the bevel pinions 95, 9S, and the bearings N39 for these pinions are likewise lubri cated. While any suitable means may be utilized to secure the pins let and I85, which support the bevel gears St and as in the spider l I2, double set screws Hi5 i l! received in the screw threaded openings I 58 serve to hold these said pins in their proper position and relationship with respect to the spider IE2 or rather in the sockets I00 and Itl.

By referring to Fig. 1 of the drawings, it will be seen that the boom hoisting 3!; 0 .tends over a sheave D which is positioned adjacent the top of the frame G and this cable continues and passes around another sheave D that is located adjacent the free or tip end E of the boom H that is pivotally mounted as J to the rear end of the platform I'l. raised or lowered to the desired angle of elevation by reeling in or paying out the cable 355. This boom rotates about the pivot pin J in the raising or lowering thereof.

The brake band it! controls the rotation of the cable drum it whereas the brake band I42 controls the rotation of the spider H2. The hoisting mechanism is placed in operation by fully engaging the slidable jaw clutch C with the gear or pinion Eli and thus this gear rotates with the shaft 25 and, when the said clutch and gear are thus engaged, the boom hoist is in an idling condition, and the cable drum It is held stationary by the brake band MI. The shaft 3 3 is rotating in a clockwise direction when Viewed as in Fig. '7 and the bevel gear 9'! is also rotating with the shaft 556 and, at the same Velocity as this shaft, of course. The bevel pinions 95 and 95 rotate about the pins I84 and E65 and, as the bevel gear is fixedly secured to the drum I0, which is in turn held stationary by the brake band Iii during idling operation, and the brake band M2 is released during idling operation, the spider H2, therefore, rotates on the shaft 34 and in the same direction as the shaft, but at one half the speed of this shaft. During idling condition of the hoist, the pawls P are traveling in the same direction as the ratchet gear I I5 and, of course, the ring gear formation 9? being integral therewith, also travels in the same direction but the ratchet gear H5 rotates twice as fast as the spider H2 to which the pawls P are secured and thus the pawls are merely idling over the teeth of the ratchet gear IE5 and there will be no engagement between these said pawls and the teeth of this ratchet gear.

In order to raise the crane or shovel boom H to wind the cable 35 on the drum It or the portion of this drum, brake band I42 is applied to the spider I it with which it is integral and the brake i il is simultaneously released. Thus, with the spider H2 being held stationary, the bevel gear G'i and the ratchet I I5 that is integral therewith drives the bevel pinions 95 and 95 which, in turn, drive the bevel gear 35. The bevel gear 85 is attached or secured to the drum I0 and the cable is thus wound on this drum as it is reeled in and, the drum is rotating clockwise, as viewed from the left end in Fig. 7. The drum 79, therefore, rotates in a direction opposite to the rotation of the shaft as but at the same speed as the rotates when the brake band M2 is engaged and the brake band I45 is disengaged as the bevel pinions and d8 reverse the direction of rotation from bevel gear 97 to bevel gear The boom fl is lb 85. During the raising operation or action, the pawls P are idling over the ratchet teeth IIB of the ratchet H5 and these pawls will not engage with these ratchet teeth.

As will be seen from Fig. 7, the lowering of the boom is effected when both brake bands MI and M2 are released. As the brake band I 42 is released, this requires the additional release of brake band Mi. When the brake band MI is released, the drum it will rotate opposite to the direction of raising with a load on the cable 35. When the cable 35 unwinds, however, the drum I6 rotates in the same direction as the shaft 34 which is in a clockwise direction, as viewed in Fig. 4. The bevel gear then rotates clockwise through the bevel pinions and 96, causes the spider H2 to increase velocity in its normal or clockwise direction of rotation as seen in Fig. 4. soon as the velocity of the spider H2 equals and starts to surpass that of the bevel gear 91, one pair of the ratchets P2, as seen in Fig. 4, will engage in the recesses i3I of the ratchet I I5. Thus the entire mechanism of the drum Ill, bevel gear 35, bevel pinions 95 and 9t, spider I12 and bevel gear er and, consequently, the ratchet II5,

will then be stationary with respect to the rotating shaft 3 3 and the boom H will continue to lower with the drum 'lil rotating at the same speed as the shaft at until one or the other of the brake bands Edi or I42 is engaged.

A faster lowering of the boom H may be accomplished by disengaging the jaw clutch C, see 8, so that the shaft 36 is free to rotate and, under the circumstances, the boom may be lowered quickly since all control of lowering will rest on the brake band Ml and acting directly against the weight of the boom l-I through the cable as.

The pivotally mounted drum locking dog 11 which is controlled through a suitable link or connecting rod H, which may be attached to an operating lever, not shown, see Fig. 6, acts as a safety means and'must be manually released from the notched peripheral edge i5 of the flange "ii before the boom cable 35 may be payed or reeled out and the boom H lowered. However, the boom B may be raised. without disengaging the locking dog ll since it will merely idle over projections l5.

While the boom hoist has been described for use in connection with earth handling and movin machines, it is to be distinctly understood that this boom hoist or hoisting mechanism is equally as well adaptable to other and varied This mechanism may, in fact, be used wherever a controlled hoisting medium is desired wherein lowering as well as hoisting action must be under full control of the operator at all times. For instance, the hoist is well adapted for use as a winch for an. automobile tow car or as a hoisting device or mechanism for material handling tractors and the like.

We claim:

1. A unitary hoist mechanism consisting of an elongated rotatable shaft, bearing mountings for the respective ends of the said shaft, a substantially circular gear fixed to the shaft adjacent one of the said bearings, a cable drum mounted on bearings concentric with the shaft and freely lfi'ta lgle on the said shaft, the cable drum includ -g substantially disc-like spaced flanges of substantially the same diameter as the said gear, one of the flanges being adjacent the said gear and having a plurality of spaced notches in its peripheral surface, a locking dog engageable in the said notches, the said drum including hub portions with which the said flanges are integral, a ring gear secured to the hub portion of the said drum and said gear being concentrically disposed with regard to said shaft and in spaced relation therewith, the other flange of the said drum having integral therewith a circular flange constituting a brake drum that is concentric with the said gear and spaced outwardly therefrom, a hub freely mounted on a bearing concentric with said shaft and in close proximity to the said ing gear carried by the said drum, diametrically oppositely disposed pinion gears rotatably carried on pins mounted in and extending radially outwardly from said hub, a brake drum of substantially the diameter of the said first mentioned brake drum mounted on and carried by the said pins and the two said drums being in side by side relationship and both in concentric spaced relation with the said shaft, another ring gear adjacent the bearing at the other end of the said shaft and fixed to the said shaft, the two said ring gears being in constant engagement with the said pin ions, a ratchet means carried by the last men tioned ring gear, pawl means carried by the last mentioned brake drum and which pawl means cooperates with the said ratchet means carried by the said ring gear, and which gearing effects rotation of the said shaft, and brake bands asso ciated with. each of the said brake drums whereby the operation of the brake bands controls the rotation of the cable drum in the paying out or winding thereupon of cable that is associated with the said cable drum.

2. A unitary hoist mechanism comprising a rotatable shaft, a cable drum freely rotatable on said shaft and including disc-like end flanges and a hub portion between the said flanges, one flange having circumferentially spaced notches in its peripheral surface, a locking dog engageable in said notches, a ring gear secured to one end of the hub portion of the cable drum and disposed in concentric spaced relation to said shaft, the other flange of said drum carrying a brake drum concentric with and spaced outwardly from said ring gear, a hub freely mounted upon said shaft in close proximity to said ring gear, members carried by and extending radially from the hub, pinion gears rotatably supported by said mem-- bers, a second brake drum carried by said mem bers and disposed in side-by-side relation to the first brake drum, another ring gear fixed to said shaft and disposed at the opposite side of said hub from the first ring gear, said pinions meshing with both ring gears, ratchet means carried by the second ring gear, a pawl carried by the second brake drum and cooperating with the ratchet means, and brake bands associated with the brake drum and adjustable to control rotation of the cable drum during paying out or winding of a cable upon the cable drum.

3. A unitary hoist mechanism comprising a frame adapted to be removably mounted upon a platform of a vehicle back of and entirely separate from a companion mechanism including a power take-off gear at its rear end, said frame having brackets spaced from each other transversely thereof, a shaft rotatably supported by said brackets, a gear carried by said shaft, one bracket having a forwardly extending portion carrying an idler pinion meshing with the gear on said shaft and for a portion of its circumference projecting forwardly from the bracket in position for meshing with the power take-off gear of the companion mechanism, a drum car d y i2 said shaft, and mechanism for controlling rotation of said drum with said shaft.

4:. A unitary hoist mechanism comprising a frame adapted to be removably mounted upon a platform back of and separate from a driving unit having a power take-off gear at its rear, said frame having a base portion and bracket portions spaced from each other transversely thereof, bearings carried by said bracket portions, a shaft extending between said bearings and rotatably supported thereby, a cable drum loosely supported on said shaft between said bearing portions, a large gear carried by said shaft between a side of said drum and one bearing portion, an arm carried by the last mentioned bearing portion and extending forwardly therefrom beyond the periphery of said gear and carrying a rotatably mounted pinion meshing with the gear and for a portion of its periphery projecting outwardly beyond the front end of the arm and thereby disposed in position for meshing with the drive gear of the driving unit, and mechanism for selectively causing rotation of the drum in predetermined directions.

5. A unitary hoist mechanism comprising a frame adapted to be removably mounted upon a platform back of and separate from a driving unit having a power take-01f gear at its rear, said frame having a base portion and bracket portions thereof, bearings carried by said bracket portions and extending upwardly at opposite sides thereof, an arm extending forwardly from one bracket portion, an idler gear rotatably carried by said arm and for a portion of its circumference projecting from the front end of the arm, a shaft extending between said bearings and rotatably mounted in the bearings, a cable drum loosely mounted on said shaft between said bearings, a gear carried by said shaft and meshing with the idler gear whereby rotary motion may be transmitted to the shaft by Way of the idler gear, and mechanism carried by said shaft for controlling rotation of said drum.

6. A unitary hoist mechanism comprising a frame adapted to be removably mounted upon a platform of a vehicle back of and separate from a companion power apparatus having gearing including a power take-01f gear at its rear, a shaft extending transversely of said frame and rotatably mounted, a cable drum rotatable upon said shaft, a gear keyed to said shaft, said frame having a portion extending forwardly beyond the gear on the shaft, an idler pinion carried by the forwardly extending portion of said frame and having its rear portion meshing with the gear on the shaft and its front portion extending forwardly and disposed in position for meshing with the power take-off gear, a brake drum carried by said cable drum and projecting outwardly from a side thereof, and planetary gearing associated with the shaft and the cable drum and serving to control directional rotation of the cable drum relative to the shaft.

'7. A unitary hoist mechanism comprising a support adapted to be removably mounted upon a platform and entirely separate from a companion mechanism including a power take-off gear, said support having bearings spaced from each other transversely of the support, a shaft extending between and rotatably supported by said bearings, a gear carried by said shaft, a pinion rotatably mounted adjacent said gear and meshing with teeth of the gear and disposed in a position adapting the pinion for meshing engagement with the power take-off gear and also allowing free movement of the pinion out of meshing engagement with the power take-off gear when the support and elements carried thereby are lifted from the platform, a drum carried by said shaft, and mechanism for controlling rotation of said drum with said shaft.

References Cited in the file of this patent UNITED STATES PATENTS Number Number 14 Name Date Sabin Feb. 25, 1930 Sirmans Nov. 11, 1930 Russell Nov. 7, 1933 Ramsey Nov. 9, 1937 Nesbitt Nov. 12, 1940 Benson May 27, 1941 Furguson Aug. 17, 1943 Gentry Nov. 28, 1944 Kuhns et a1 Mar. 20, 1945

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