Патент USA US2131479код для вставки
Sept. 27, 1938. J. R.- MCGIFFERTHET Al. " _ 2,131,479‘ LOADING yn'ors'r ' > Filed July 11, 1936 amz 3&3 W ~ 3 Sheets-Sheet 1 Sept. 27, "1938! ' J. R. MCGIFFERT ET AL ‘LOADING HOIST .Filecl July '11, 1936 ‘ . 2,131,479 . ‘ 3 Sheets-Sheet .3 my], i6 1.. . .1Hf 101? 15 611M441 ' Sept. 27, 1938; J. RIMCGIFFERT ET AL 4 2,131,479 LOADING HOIST Filed July 11, 1936 3 Sheets-Sheet m$5,s0“?8“ ' 2,131,479, Patented Sept. 27, 1938 UNITED STATES ‘PATENT. ‘OFFICE LOADING nors'r _ John a. McGifiert and on L. Bel-by- Duluth,'_ Minn, assignorsvto Clyde Iron- Works, Duluth, ' Minn” a corporation of Minnesota ‘Application- .my 11-, 19:0. Serial No. time (01.212-145) lzclalms. the hoisting equipment a heavy load may be lifted at the end of the boom and which is counter balanced by the weight of the hoist and tractor Our. invention relates to an improvement in loading hoists of a type designed to be readily movable from one position to another and which is particularly designed for use in loading logs as well as by the counter-weight. These and other novel features and objects 5 5 on trucks, sleighs, or other vehicles, and is adapt able for general hoisting and material handling. of our invention will be clearly andfully set . steel erection, pile driving. and clam shell. and . forth in the following specification and claims. In the drawings forming a part of thisspeci bucket. work. ‘ Loading devices due to their size‘ weight" flcation: 10 are naturally‘ difficult to move from one position to another. We, have found that where loading -' devices have been mounted upon crawler units or the like, they are often top heavy and unstable and are unable to lift heavy loads at any great ll distance from the hoist. ' It is a ‘feature of our invention to provide a‘ ~ ‘ Figure 1 is a side elevation view of our loader 10 \ in loading position. - Figure 2 is a front elevation view of the same loader whichis readily portable and yet which with the boom cut oil and the hoisting machinery omitted to show the detail of the construction of the front. 16 Figure 3 is an enlarged view of the front end of the hoist frame, disclosing the leg of the frame is ?rmly supported during loading operation. in lowered position. ' Figure 4 isaview similartol'igure 3,showing the pivoted legs in raised position. This feature is accomplished by providing rigid 20 legs pivoted to the frame of the loader in such a manner that they may be raised out of operative - ‘Figure 5 is a perspective view of one of the piv-' ground engaging position during the movement _oted legs, disclosing the construction thereof‘. Figure 6v is a top plan view of our loader. of the loader from one position to another, and Figure 7~is an enlarged detail of the hoisting yet which‘ may ?rmly support the loader during _ as loading operation. - equipment. - ' It is a feature of our invention to provide a Figure 8 is a diagrammatic side elevation view, loader mounted upon a tractor preferably of the disclosing the legs in partially uprighted‘positon. crawler type provided with- supporting legs for one end of the frame which may be .operated in ‘80 unison into contact with the ground. ‘The move ment of the tractor toward the legs may act to pivot the same into upright position to rigidly support one end of the loader frame. The legs . 26 Figure 9 is-a sectional view through a detail portion of our device. ‘ v Figure 10 is a diagrammatic plan view illus- so trating the manner in which the live boomv may- I be supported to the loader frame. [A Our loader A is provided with arframe vhaving are of suillcient length to relieve the weight on _ a pair of spaced channels ll ‘which are secured 36 one end of the tractor. so that the loader is en intermediate their ends to a tractor B. The at--35 tirely supported by the rigid legs and the spring ‘tachment of the channels II to the tractor B supported end of the tractor. . . ‘ - _ c‘ ' . may vary with the type of tractor used and in Our invention resides in providing a loader the type, disclosed, bolts directly at I. to the which is mounted upon a standard ‘tractor and "frame at one end of the tractor and is secured Q ‘40 which is balanced in such a manner‘ that the adjacent the other end by means of brackets I4. '40 center of gra'vityfof the device coincides with The channels I. are connected by‘ suitable cros the center of gravity of the tractor itself. In members,_suoh as It, and areprovided at one this manner,' the pitching of the,loader during, end with a counter-balance box it within which movement‘ thereof is to a large degree eliminated. may be placed sumcient ballast of any desirable t5 Itis a feature of our, invention to provide a typelto cause the center of gravity of the assem- 45 bled loader to coincide with that of the tractor loader comprising a frame mounted upon a trac tor and extending beyond the ends'thereof and B alone. The ballast‘ box I! is placed at the end. having at one end of the frame a live boom and ' of the frame projecting-forwardly from the front. a double drum hoist operated by power‘ supplied ll of the tractor. A hoist _C is mounted OllgthE g 50' by the tractor engine. The other. end oftheu frame to the rear of the tractor-B, as will be more 50 clearly described in detail. Power ofoperation _ frame is provided with a counter-weight to‘coun tor-balance the weight of the hoisting equipment. The load is in this way counter-balanced during movement of the hoist. By providing the rigid 5s legs at the extreme end of the frame supporting‘ of the hoist is provided by means of the power take-oi! shaft sprocket i1. ' . .Attherearendsofthechannels llwepro-. vide a vertical A-frame ll comprising a pair of la" " 2 2;1s1,479 -channels secured at their lower extremities toa cross member l9 extending transversely across the channels l8 and projecting somewhat beyond the channels Ill. The channels forming the A frame l8 are preferably secured to plates 28 1 which in turn are secured to the cross chan nel 9. . ' - Centrally between the channels 18 and mount ed upon the cross member 19, we provide a bevel 10 connection 22'which is hingedly secured at‘ 23 to a live boom 24. The boom 24 is constructed ' of special alloy steel of moderate weight and am ple strength. The boom comprises a pair of 0p positely disposed channels 25' connected by cross 15. members 28 at spaced points. Spaced plates 21 depend downwardly from each end‘of the cross channel 19 to accommodate legs 28 which are hingedly supported therebe tween by means of a pivot pin 29. In the form 20 illustrated, the legs 28 comprise a pair of chan nels 38 which are oppositely disposed and con nected along one side of they covering plates 32. The inner plates 21Tadjacent each leg are pro vided with a ?ange 33 which projects into the 25 body of the leg adjacent the inner channel 38 when the leg is‘in upright position as may be seen in Figure 5 of the drawings.‘ , ' " spring suspended, while the rear end is the rig idly supported end of the tractor,‘ and according ly the loader A is supported entirely by the‘ legs 28 and by the spring suspended end of the trac tor B. This fact enables the loader to beerected upon somewhat uneven ground without straining the frame work and provides the equivalent of a three-point mounting rather than a four-point support as would be found if the rigidly support ed end of the tractor remained incontact with 10 the surface of the ground. ‘ The hoist C disclosed, is provided with two ca ble drums 48, each or either of which may be used separately or simultaneously. ' In normal operation, the boom 24 is connected to the top of the A-frame by a tie cable 49 so that the reach of the boom remains constant during the loading operation. The boom 24, however, may be raised above this position upon occasion by- a cable op erable upon one of the cable drums 48 and ex 20 tending through a sheave 58 at the top of the A frame and connected ‘to the outer extremity of the boom 24. . - _ The manner in which the various cables are driven is best illustrated in Figure 3 of the draw 25' ings. From the power take-off I1 of the trac tor B, a chain 52 operates a sprocket ‘53 one shaft 54 upon which is mounted a pinion 55. The This flange 33 acts to hold the leg with which it engages from side movement when the leg is pinion 55' meshes with .a gear 58 on a shaft 51. 30 in this upright position. A ?ange 34 on the in-‘ The gear 58 engages the gear 58 on a shaft 59. 39 ner plates 21 limits the upward movement of the A gear 80 on the shaft 51 engages a gear 82 on a legs 28 when the legs are drawn into inoperative shaft 83. One of ‘the cable drums 48 is mounted position, as illustrated in Figure 4 of the draw ' upon the shaft 51, while the other is mounted ings. The channels 38 are adjustabiy connected upon the shaft 59. Suitable clutches are providé by bolts 35 or other suitable means to a pivot end ed between the gears 58 and 58 controlled by a 35 38 which is pivotally connected to the shoe 31. control mechanism 84 diagrammatically shown Each shoe 31 is provided with a bearing plate in Figures 6 and‘ 7, but which is not disclosed in 38 having upturned ends 39. to which is secured detail as this mechanism is well known in the a pair of upright channels 48. ‘The pivot end art. Suitable brake‘ bands are also provided 40 38 of each leg 28 is provided with a transversely which are not shown in the drawings to prevent 40 extending pin 42 extending through 'slots 43 in the channels 40. Accordingly, the legs 28 are piv confusion. _ Upon the shaft 83 is mounted a pair of friction ‘ otally connected ‘to the shoes 31 so that'the shoes drums '85 as may be seen in Figure '1, which are may maintain a substantially horizontal position ' valso controlled bysuitable controls 84. A cable 45 by their own weight even when in inoperative po-‘ 88 is wound upon one friction drum 85, passes through a sheave 81 to a sheave 88 on the boom Each leg 28 is provided with ‘a gear segment 44 - 24. The cable 88 passes over the sheave 88 through a pulley 89 mounted on the adjacent end of the attached along one side thereof which isengage cross channel l8 and is secured to the sheave able with a pinion 45 on a transversely extend ing shaft 46. As the pinions 48 are both secured bracket 18 of the sheave 88 on the boom 24. 50 sition. ' - . for rotation with the shaft 48, it may be seen The other friction drum 85 is likewise provided that the legs '28 pivot in unison to prevent one' ' with a cable 12 passing through a sheave 13 on leg from assuming a vertical position before‘ th ' the frame, through a sheave 14 on the boom, back through a pulley 15 on the adjacent end of .the other due to uneven ground surface. > - 55 The legs 28 with the'shoes‘ 31 are somewhat" cross member l8, and is ended at the sheave 55 longer than the normal distance between the bracket 18 on the boom 24. Movement of one of frame and the surface of the ground. Accord- - the drums 85 will act to pivot the boom toward the engaged friction drum 85’while the cable will pay out from the opposite friction drum 85. In 60 ‘contact with the ground as shown in Figure 8v order to. prevent slack in the cables 88 and 12. 60 of the drawings. The tractor B is then driven 'we provide a cable‘ 11 terminating on one drum rearwardly for a short distance, the shoes 31 en- ’ 85 and passing through sheaves 18 and 19 with gaging the ground and pivoting into the vertical ‘ its other end secured to the opposite friction position illustrated in Figures 1 and 3. A means‘ drum 85. This ‘cable 11 causes the drums to move 65 '-is provided which will be later described to- assist 1 uniformly and to pay out an amount of cable 65 in drawing the legs 28 into vertical position in] from one drum 85‘which is wound upon the other . ingly, when the legs are being pivoted into 'verti-‘ cal position they \are allowed to pivot down‘in'to case the surface of the ground isetoo smooth to be engaged by the shoes 31 as the tractor B is drum. Spring bumpers 80 are mounted on the cables 88 and 12 to limit the swinging of the boom moved rearwardly. Due to the fact that the legs within the desired arc. 70 28 are somewhat longer than the‘ normal dis tance between the pivot point and the surface of the ground when the legs are drawn into ver-' _ The hoist C is- somewhat wider than the distance between the channels l8, and is addi 70 tionally supported by angles 82 parallel to the tical position, the rear end 41 will be raised ' channels In and supported by transverse chan slightly from the' surface of the ground. In the n nels 83 and 19. The cross channel I9 is rein 75 tractor B disclosed, the front end 18 thereof is" forced by'a girder-arrangement between the in 75 3 2,191,479 - ner plates 27. This construction comprises a and through a sheave I08 at the free end of the cross channel 8| below and parallel to the channel ' boom. The other load line I04 may pass through I9. From the outer ends of the channel 88. chan the others of the pairs of sheaves 50, I05, I08, if nels 85 are secured slanting inwardly and up- ' desired. This line I04 may also be used as a drag line, or as a guy line by extending it through wardly to another shorter cross channel 88 se cured beneath ,the ends of the channels I0. A one of the‘pulleys 50 in the opposite direction from that usuallyv used, and by anchoring the line - plate 81 is welded or otherwise attached be tween the cross channels to form a truss or to a fixed anchor I01 at a point in front of the I ' girder reinforcement for the center of the cross tractor B. 7 10 channel I9 upon which the boom 28 is pivotally ._ When it is desired to change the position of 10 attached. The A-frame I8 is also reinforced by the loader, the setting up'procedure is reversed. angles 88 extending from the top of the A-frame The pins 98 are ?rst removed, and the tractor B I8 to a point on the channels I8 forwardly of is then driven forwardly until the legs 28 assume the A-frame. . u the position illustrated in Figure 8 of the draw Depending from the cross channel 88 at one ings. The load line 98 is then attached to the 15 15 end of the‘ channels I0, and from a cross member loops'88 of the legs, and the legs drawn upwardly It near the other end thereof, we provide bumper into the position illustrated in Figure 4 of the drawings. means to dampen any tendency of the as When the legs 28 are in supporting position, sembled loader to pitch during movement over 20 rough» ground surface. These bumpers 88 are the loader rests entirely upon the legs 28 and merely linked in position, to swing ‘freely over upon the spring supported end of the tractor B. .20 . obstacles. Each bumper 89 comprises a cylinder In tractors of the crawler type, one end of each 90 having a loop 92 thereon for connection with tread is spring supported; and it is desired to the loader frame, and a bearing end 98 slidably. have this ‘end contact the ground so as to .com connected to the lower end thereof. A spring 88 pensate for uneven ground, and to prevent 2.5 is interposed between the cylinder 00 and the strain on the frame of the loader. bearing end 93 thereon within the‘ cylinder, and In accordance with the patent statutes, we acts to cushion any longitudinal rocking of the have-described the principles of operation of 'our loader frame. ‘ ' loading hoist; and while we have endeavored to 30 From the foregoing description, the operation set forth the best embodiment thereof, we de 30 of our loader is believed readily understood. In sire to have it understood that this is only il~ moving from one position to another, the legs 28 lustrativelof a means of carrying out our in vention, and that obvious changes may be made are in raised position, and are held in this posi tion by means of the load cable 85 on one of the within the scope of the following claims without cable drums 48, which is engaged In a loop 86 departing from the spirit of our invention. 85 on each leg 28. Where the loader A is being used ' narily used having two hooks connected to a connecting ring'on the cable 85. One of these hooks may be inserted through the loop 88v on each leg in drawing the legs 28 into inoperative position, shown in Figure 4. - We claim: ' _ 1 ‘ ‘ - 1. A tractor supported hoist in combination with a tractor comprising a frame secured to said tractor, a pair of supporting legs securedto one for loading logs or the like, a sling 81 is ordi end of said frame, aligned pivots connecting said legs to said frame and means connecting said ' legs to pivot in unison. - . . tractor is moved to the desired point, and the load 2. A tractor supported hoist in combination with a tractor comprising a frame longitudinally cable 55 is'lowered, the shoes 81 contacting the secured to said tractor, a~ hoisting unit on said surface of the ground. The cable 85 is removed 'from the loops 86, and the tractor 3 moved rear wardly until the legs are pivoted intov upright frame, legs on said'frame longitudinally spaced from said tractor, aligned pivots connecting said frame and legs, and means connecting said legs to operate said legs in unison. When it is desired to operate the loader, the position. ‘Pins 88 may then be inserted through the legs and into the inner plate 21 as shown in ' Figure 5, to hold the legs in upright position. '3. A tractor supported hoist in combination‘ with a tractor comprising a frame longitudinally In some cases the surface of the ground upon - secured to said tractor, legs pivotally secured on which the loader is to be operated is smooth or transversely aligned pivots to said frame, bearing slippery, and rearward movement of the tractor shoes pivotally mounted on said legs, and means B when the shoes 81 are in partially erected 'posi connecting said legs‘topivot the same in unison. tion illustrated in Figure 8 merely slides these 4. Ahoisting device in combination with a'trac shoes over the surface of the ground. To avoid" tor including a frame secured to the tractor and trouble in such cases in properly erecting the legs, , extending beyond one end thereof, supporting we provide a sheave I80 on the shaft 48 having a ‘ means for said extended end of said framepiv short length of cable III. secured thereto with a otally secured to said extended end and movable 60 ring I02 on its free end. The load cable 85 is‘ into vertical position, and means engageable with carried over the sheave III on the cross channel said supporting means to lock the same‘ in verti 84 and attached to the ring I02. By exerting a cal position, said locking means including a lock ing'pin, said supporting means being of suf ficient length to take the weight off oneend of 65 pull on the load cable 85 as the tractor 13 moves 65 rearwardly, the sheave I03 is rotated, turning the shaft 48 and the pinion l5, forcibly erecting the legs as the tractor moves. ' ' The cables 85 and I04 from the two drums 88 may be used simultaneously or separately and 70 individually as desired. As has been stated, one cable‘ may be used for raising the boom 20 if de sired. When used for raising a load, the cable‘ 95 passes over one of a pair of sheaves 50 at the top of the A-frame, over one of a pair of sheaves 75 I05 at the base or pivoted end of the boom 28, said tractor. ' .I - 5.'A hoisting device in combination with a supporting vehicle having longitudinally spaced weight supporting points, including a frame ex tending beyond said weight supporting points, w supporting means pivotally connected to said frame beyond said weight supporting points and movable into vertical position, means locking said supporting means in vertical position, said locking means including a locking pin said sup- 75 > 4 2,131,479 porting means being of sufficient length to raise said end of said frame to take the weight off one of said weight supporting points. relation with the ground adapted to dampen any ' pitching of said vehicle by engagement with the ground, and to pass freely over obstructions. 10. In a loadinghoist, a tractor, a frame on 6. A hoisting device in combination with a sup porting vehicle including a frame secured on ‘said tractor extending substantially beyond the said vehicle, a supporting means on said frame ends of said tractor, and a bumper means swing longitudinally pivotal into and out of engagement -ably depending from said frame adjacent each with the surface of the ground, and shoulder end thereof, said bumper means normally depend ing to a point spaced slightly from the surface means on said frame engageable with said sup 10 '10 porting means at a point spaced from the pivot of'the ground, said bumper means resiliently com pressible when forced downwardly upon the thereof when said supporting means is in en . gagemeiit with the ground-to limit transverse ground. 11. In a loading hoist, a supporting tractor, movement in either direction of said supporting a frame extending beyond said tractor, a bumper means. 7. A hoisting device in combination with a depending from said depending end to a point 15 15 normally spaced from the ground, said bumper supporting vehicle'including a frame on said ve hicle, a pair of supporting means on one end comprising a pair of telescopically arranged mem of said frame pivotally engageable with the bers, and a spring normally holding said mem bers extended, said spring permitting said mem-' ground, a pivotally supported shaft, means con 20 necting said shaft and supporting means to ro tate said shaft when said supporting means is pivoted, and means on‘said shaft for pivoting said supporting means in either direction. 8. _A hoisting device in combination with a sup bers to compress when said bumper strikes the 20 ground. ' 12. In a loading hoist, a tractor, a frame there upon, a pair of pivotally mounted legs on one end of said frame pivotally movable into engagement‘ 26 porting vehicle including a frame extending sub- _ with'the ground, shoulder means on said frame stantially beyond the vehicle, and resilient bump limiting the pivotal movement of each of said legs, er means depending from said frame engageable and ?ange means on said frame engageable with with the ground and normally spaced from the ground to, mollify any pitching thereof. each said leg when said leg is in contact with said shoulder to prevent axial side movement of said 9. A hoisting device in combination with a sup porting vehicle including a frame extending be yond said vehicle, .' and bumper means swingably depending from said frame into normal spaced legs with respect to said frame. . JOHN R.’ MCGIFFERT. OLA ‘L. BERBY.