US2125007A

US2125007A - Loader

Info

Publication number: US2125007A
Application number: US17422A
Authority: US
Inventors: Stanley F Ossing
Original assignee: Jeffrey Manufacturing Co
Current assignee: Jeffrey Manufacturing Co
Priority date: 1935-04-20
Filing date: 1935-04-20
Publication date: 1938-07-26
Anticipated expiration: 1955-07-26

Description

S. F. OSSING July 26, 1938.

LOADER Filed April 20, 1935 3 Sheets-Sheet 1 lPVVE/y TOR. -fwd/Way FOss/ng,

ATT'X July 26, 1938. s, 055mg 2,125,007

LOADER Filed April 20, 1935 3 Sheets-Sheet 2 [N VEN TOR 5 7'6 /e 055 lbs;

ATT'x PATENT OFFICE Stanley noun. Columbus, on, m to Jeflrey Manufacturing a corpor'ation a on Application April 20. ms. Serial m. rm:

' 18 cums. (01. 198-233) This invention relates to a' loader. and particularly to a self-propelled loader of the type generally employed to load coal, coke or like materials from ground storage into a truck.

' An object of the-invention is to provide an improved loader of the; above general type and particularly to provide means for varying the height of the discharge end thereof in small incrementsand within a wide range;

Another objector the invention is to mount the loading b om of-'a-loader of the above mentioned type so his free to move longitudinally with respect to; the derrick thereof andto increase thejdownward thrust on the fore part of the supporting truck as the longitudinal force on the. loading boom increases. i

Another object of the invention is'to provide an improvedmeans' for supporting a loaderbooin while it is in operating position. g I 2 Still another object .of the invention is to provide an improved supporting means for a loader boom 'when'it is in non-operating or in transporting position whereby the boom hoisting cables are-slack and the boom is carried in a 2 substantially-horizontal position;

Other objects of the invention will appear hereinafter, the novel features and combinations beset forth in the appended claims.

In the accompanying drawings: V Fig. 1 is a side elevatlonal view of one form of my invention with the conveying boom in a transportin position; r

is a side elevational viewof the device of Fig. i with the conveying boom in a material- .25 conveying position;

' mg. a is a detail iewgshowin the counter 1 shaft and various drive means driven thereby; Fig. i is a plan-view of the truck-mounted operating-means with numerous-parts not showing; Fig. 5 is a front elevational view of the device 'of Figs; 1 and 2 (taken on line H of Fig. 1) 7 with the conveying boom in the position illustratedin Fig. l; d

Fig. 6 is a plan view of the conveying boom carnage:

Fig. '7 is an elevational view of the carriage of Fi v Figs 8 is a side elevational view of a modified form of my invention; and g Fig. 9 is a further modified'iform of my invention.

- Referring particularly to Figs. 1 and 2 of the drawings, there is illustrated a loader comprising my invention. 7 Said loader comprises a truck A which has both lateral and longitudinal stability and is therefore capable of supporting the entire operating in without further aid. Mounted upon said truck A. is a derrick B with which cooperates an appropriate elevating mechanism for adjusting the position of the loading boom 0. The loading boom 0 is attached to the derrick by an appropriate attaching and thrust receiving strut 'D. A crowding and limiting strut E is also provided, By virtue of the selfcontained nature of the loader, the truck A may be operated to propel said loader to any desired position where it is to be operated and perform a loading function. By elevating the loading boom C with respect to the derrick B, the material receiving end of said loading boom is automatically lowered while the material discharging end thereoiis automatically elevated. When the loader is in the position illustrated in Fig. 2, it is ready to perform a loading operation and the lowered material receiving end of said loading boom C may be forced into a pile of material to be loaded, such as a pile of coal, gravel or any other similar material. During such loading op-' eration, the material is gathered by the loading boom C and discharged into an appropriate conveyor, such as a truck. The thrust receiving strut his so positioned that in any operating po- '.sition of the loader the end thereof which is atv the derrick B and thus there is no appreciable thrust transmitted from the loading boom C to the derrick'B except that .through the strut D.

One of the principal features of my invention relates to the carriage Fwhich supports the loading boom 0 with respect to the derrick B, which carriage allows free relative movement between said loading boom C and said derrick B adjacent the supporting position. I

Referring more to the details of the loader of my invention, the truck A comprises a frame II I tween the sprockets l3 and the discs l5 on each side of the truck A, there is provided an endless articulated crawler l6. A supporting plate l1 (Figs. 1 and 2) is provided adjacent each side of the frame l8 and attached rigidly therewith which plate is provided with a pair of idler rollers 18 cooperating with the crawlers l6 to aid in supporting the frame l8 therefrom.

Mounted upon said frame I is a motor 19 which may be either of a gasoline or an electric type and which is employed to perform a number of functions, as will be hereinafter described. Motor I8 is directly connected through chain and sprocket mechanism 20 to a clutch and gear transmission mechanism 2| from which extends a drive shaft 22 which is directly connected to a counter shaft 23 (Fig. 3) through chain and sprocket mechanism 24.

The counter shaft 23 is mounted upon the truck A by appropriate journal bearings 25 (Fig. 3). Co-opcrating with said counter shaft 23 is a friction clutch mechanism 25 with which cooperates a chain and sprocket mechanism 21 for driving a stub shaft 28 which stub shaft 28 drives an endless conveyor belt 28 on the loading boom C, through a chain and sprocket mechanism 30. Said chain and sprocket mechanism 33 drives said conveyor belt 29 through a roller 3| carried between side plates 32 on said loading boom C. Idler rollers 33 are provided to increase the friction between said conveyor belt 29 and said roller 3|. A chain tensioning mechanism 34 is carried by the strut D for maintaining proper tension in the chain of the said chain and sprocket mechanism 36.

It may be noted that the strut D comprises a pair of spaced angle members mounted upon brackets 35, one of which brackets also supports the chain and sprocket mechanism 21. The rear pivotal point of the strut D is in alignment with the axis of the stub shaft 28 where each is mounted on said brackets 35. This maintains the chain and sprocket mechanism 38 in proper tension regardless of the position of said strut D. The friction clutch 26 for driving the conveyor belt 28 is operated through an operating lever 36.

Also co-operating with said counter shaft 23 is a pair of

friction clutches

31 and 38. Friction clutch 31 co-operates with chain and sprocket mechanism 39 to drive pinion gear 40 through drive shaft 4|, which pinion gear 40 co-operates with the master gear 42 rigidly attached to one of the crawler drive sprockets l3. Friction clutch 38 co-operates with a similar chain and sprocket mechanism 43 to drive pinion 44 through drive shaft 45, which pinion 44 cooperates with a master gear 46 to drive the other crawler drive sprocket l3. 'Operating levers 41 are provided, one for the clutch 31 and one for the clutch 38, for operating the crawlers IS individually. It is manifest that by operating the two crawlers at the same speed, the loading mechanism may betransported in a substantially straight line. By operating one of said clutches while the other is rendered inoperative, only one of the crawlers will be driven and the loader may effect a turn. I

Also co-operating with the counter shaft 23 is a jaw clutch 8 which, through appropriate chain and sprocket mechanism 49, drives an elevating winch 50 through a self-locking worm' drive This jaw clutch mechanism is operated by an appropriate lever 52. The complete function of this mechanism will be described more in detail hereinafter.

Adjacent one side of the truck A, there is provided a stand 63 (Fig. 5) upon which an operator can stand and operate the device. Easily reached by the foot of the operator is a footoperated clutch pedal 64 for controlling the clutch of the mechanism 2|. A gear shift lever 55 is provided for changing the drive ratio between the motor l3 and the drive shaft 22 and also for changing the direction of rotation of said shaft 22.

The derrick B; which is supported by the truck A, comprises a pair of spaced masts 56 and 61 (Fig. 5) each formed by a pair of upwardly extending angle members 58 and 53 (Figs. 2 and 4), which are spaced apart adjacent their bottoms where they are rigidly attached to the truck A and are attached together by an appropriate gusset plate 60 adjacent their tops. Adjacent the tops of said

masts

66 and 51 are provided pulleys 6| and 62, respectively, the function of which will be described more in detail hereinafter.

In the form of my invention, as illustrated in Figs. 1 and 2, the boom C is formed by a pair of upper side plates 63, which are spaced apart, from which extend inwardly projecting guide flanges 64 (Fig. 5) for guiding the upper run of the conveyor belt 29. A head pulley 65 is provided adjacent the material receiving end of said boom C and an adjustable tail pulley 66 is provided adjacent the material discharge end thereof. The conveyor belt 28 is preferably provided with upwardly extending cleats 61 to aid in maintaining the material on said conveyor belt.

Adjacent the discharge end of the conveyor boom C, there is provided a discharge and screening chute comprising a trough 68, the upper portion of which has a screen bottom 68 through which fine materials may pass and be discharged forwardly into an auxiliary chute 18. The trough 68 is adjustable in position by adjusting rods 1| which are adjustable relative to the boom C by an appropriate mechanism which may comprise cables 12 attached to one of the ends of the rods 1| and reeved about pulleys 13 from whence they are attached to an appropriate winding drum operated by a crank 13' which may be maintained in any desired position by pawl and ratchet mechanism 14.

The loading boom C is also provided adjacent its bottom portion with a pair of laterally spaced longitudinally extending angle members 15 which are rigidly attached to the upper side plates 63 by appropriate reinforcing angle members 16 whereby the boom C comprises a rigid structure. Adjacent the central portion of said boom and on each side thereof, there is also provided a pair of plates 11, which plates are rigidly attached to both the angle members 15 and the upper side plates 63.

One of the important features of my invention comprises the cradle F illustrated in detail in Figs. 6 and 7, and shown in its operative position in Figs. 1, 2, 8 and 9. This cradle is adapted to support the boom C with respect to the derrick B and to provide relatively free longitudinal movement of said boom with respect to said derrick. It is eflective, however, to adjust the height of the discharge end of said boom C and aids in supporting said boom when it is in a transporting position. Said carriage F comprises a frame forming a pair of side plates 18 between said side plates II' and II and-said reinforcing Plat s II- and II is'a plurality 'of araao'or and a to the outsides of whichare wanes rein-' forcing iilates so and II. Extending laterally elongated feds I2 which have their ends threaded to receive appropriate nuts It. vBald rods If are provided with spaced sleeves II which are eflective to space said side plates and a pair of reinforcing and guide plates II which are spaced inwardly of said side plates.

Adjacent its forward end, the carriage is provided with a laterally extending shaft II which projects laterally'to each side of'the side plates II and II and carries a pair of pulleys II and II which are loosely iournaled-on said shaft II.

.Carriedat the extreme ends of said shaft is a pair of friction blocks II and II which have end flanges II- and II, respectively. Said blocks" are rigidly attached to said shaft II by appropriate nutand bolt means It. Bald blocks II and II are provided withsquared faces and are adapted to ride upon the angle members II of the masts It and I! and to have friction engagement therewith.

Adiacentto its rear' end, the carriage F is" provided with atra'nsverse shaft II which carries a pair of pulleys II and 96 adjacent the outer plates II and II. The shaft It may be secured to the guide plates It against rotation relatively thereto and thereby serve as an axle for the pul-.-

leys II and SI journaled thereon. The front shaft II. however, should be lournaled in the guide plates 85 to have a rocking movement relatively thereto since the slide blocks II and 90 are secured to the ends of the shaft II in position to ride up and down the front sides of the derrick E.

. The shaft 9% is; provided with an extension 91 in position to strike against the lever It.

(Figs. 1 and 2) so as to exert an upward pull on the rope 99 and shift the lever I2 laterally,

thereby limiting the possible upward travel of the carriage or cradle F with respect to thederrick B. That is, whensaid carriage F approaches its upward limit, of travel, extension Ql will contact the lever 98 which is operative through an appropriate cable mechanism 09 to operate the lever 52, thereby disengaging the winch clutch II to prevent any further upward travel of the carriage F.

Spaced between the sideplates It and I9 and the reinforcing plates 85 and mounted on, the shafts I6 and St is a plurality of anti-friction rollers IIIl. These rollers Hill are adapted to cooperate with the angle members Ill of the loading boom C to provide anti-friction support lowering of the material receiving end thereof comprises a pair of cables III and I02. As each of these cables is operative in substantially the same, way except that they are on opposite sides of the-derrick B, a description of one will yes for both.-

The cable tilt is anchored to the mast fit adjacent top thereof by an chor mean transverse rod, III the ends of which may III from which it eds pulley c1 of the carriage F, then M the policy of said-sea then unto the pulley ti on the W, then down over a guide pulley III fromwhence it is directed to the winch It. It'is evident thatby rotating the winch mechanism "in one direction, the car--- riagel 'wiilberaisedandbyrotatingitinthe oppositedirection, said carriage will be lowe. The cables lII'and III are also edective ts keep 7 the bearing blocks II and-II in frictional en anglemembers II of the gagement with the masts II and I1. ltxtendinglaterally between the masts IIand I1 is a transverse supporting angle cross-niece III on which the carriage 1" is adapted to rest when in its horizontal and lowermost podtion as illustrated inrig. l. The center of gravity of the loading boom G is forward of the crosspiece III or tov the right thereof as viewed in Fig. 1. The front angle members II of. the spaced apart masts II and I] are each providw with'forwardly extending plates" .III and IIl,

respectively, as shown inlilgs. 1, 2 and 5. Ex-

tending between the plates III and III is a bolted to the plates .III and II'I.

To the rear portions of the plates III and III are pivotally connected arms 'III. and III at III (Fig. 2). Between the outer ends of the arms III; III extends a transverse rod- III carrying at each end a plurality of anti-friction rollers Ill in position to co-operate with the angle members II at the lower sides of the loading boom 0 when-the latter is in'its transport tion position shown in Fig. i. f a

The spaced-apart plates III and III are 9110- vlded adjacent ctheir, forward ends with open slots II: which are adapted to receive removably a transverse rod Ht which is adapted to supportthearms IIIj'and III to hold the-rollers Ill in a position to support the loading boom G.-

- 'Ihe rollers III-when in operative positionfor supporting the loading boom C, which is the transporting position asiiiustratedin Fig. l, are positioned in advance of thecenter of gravity oi the loading boom (2. It'is thus evident that the center oi gravity'of' the loading boom C will fall between the rollers III and the cross-piece I05, and consequently the weight of the boom 0 will be distributed between the cross-piece IIil and the rollers Ill when the machine is beine:

transported. Under these circumstances the tension on the cables IN and I02 may be relieved.

when the machine reaches the place where it is to be operated, the winch II of Pig. 4 may be rotated by power to exert suiiicient tension on the cables III and III to lift the boom thereby.

to relieve the weight on the anti-friction rollers Mt as hereinafter described in more detail,

whereupon the rod III may be removed so that the arms III, III will descend and-rest against the cross rod III' as shown in Fig. 2.

The connection of the struts D and E at their I outerends to the bottom of the boom Cj adds to the weight of the latter and should be taken into consideration in locating the effective center of gravity. The effective center of gravity of the boom 0 and the parts connected thereto is preferably between the shaft It and the rollers 70 III when the boom is in its transportation position shown inl 'lg. i. Upon operating the hoisting mechanism to lift the m E, the res iii will act as a w w for movement at the 'hoom he directed at e ts n a, to a a fulcrum to enable the boom Cto be lifted ofl the rollers III, whereupon the rod III may easily be removed to permit the arms I". III and the rollers III to descend to the positions thereof shown in Fig. 2. When it is desired to effect automatic movement of the receiving end of the hand portion of the boom C will eflect an automatic lifting of the forward end of the boom together with the forward end of the struts D and E to their upper positions shown in Fig. 1.

After the rod II3 has been removed and the anti-friction rollers together with the arms I08 and I! have been located as indicated in Fig. 2, further hoisting of the carriage F will effect shifting of the center of gravity of the loading boom C towardthe right as viewed in Fig. 1, relatively to the derrick B and relatively to the carriage F. Consequently the front end of the boom C will move automaticaly by gravity to its operating position shown in Fig. 2 while'the carriage F is being hoisted to its position shown in Fig. 2.

The lower spaced-apart strut bars E are pivoted at their rear ends 'to the front end of the crawler tractor as shown in Figs. 1 and 2, and at their forward ends the strut bars E are provided with pointed shoes or wedges Ill which are provided with longitudinal elongated slots II5.into which extend the ends of the shaft 65 of the head pulley 65. The wedges Ill afford an efiicient means for entering the bottom of a pile of loose material, such as coal, and holding the receiving end of the conveyor C in its lowermost position adjacent. the surface on which the pile of loose material is supported, thereby preventing the receiving end of the conveyor C from riding up on the hill of coal. In other words, the wedging action of the shoes II4 keeps the receiving end of the conveyor C nosed into the hill of loose material for emcient gathering thereof. However, the ends of shaft 65' by riding along the slots H5 afford an efficient support for the forward end of the conveyor C at various elevations of the shoes H4 relative to the level on which the crawler tractor rests. During operation of the loading machine the side skirts IIG prevent material of the loose pile from flowing laterally into the space below the forward end of the conveyor 0.

It should also be noted that the ends of the shaft 65 of the head pulley 65 co-operate with the outer ends of the slots H5 to limit the upward movement of the receiving end of the conveyor C to its transportation pos tion shown in Fig. 1. In a similar manner the rear ends of the slots II5 may be taken advantage of to limit the lowering movement of the receiving end of the conveyor so that assurance may be had at all times during operation over various surfaces supporting piles of loose material, that the strut D will be inclined upwardly for'wardly from its pivot point 28, relative to the horizontal.

After the receiving end of the conveyor C has been moved to its gathering position shown in Fig. 2, the hoisting mechanism may be relied on to adjust the elevation of the rear or discharging end of the conveyor boom C. After the conveyor boom C has been adjusted with its receiving end in a gathering position and its discharging endat the desired elevation, the clutch ll of Fig. 3 may be released so as to permit the self-locking worm gearing SI of Fig. 4 to lock the winch II and the hoisting ropes III, I If in their adjusted positions, whereupon the conveyor boom C will be supported relative to the derrick B as shown in Fig. 2. During operation of loading material from the loose pile the crawler tractor A is operatpd to move the whole machine forwardly to nose the wedge shaped shoes Ill into the material and'thereby hold down by the pin and slot connections 65', II! the receiving end of the conveyor C. Duringthe. forward movement into the pile of material the endless conveyor 29 is operated by power from the motor I! to elevate the material along the conveyor chute to the discharge chute 68 where the screening may pass through at 69 to the auxiliary chute III.

In order to maintain ample traction of the crawler tractor with the ground over which it travels, it is desirable to prevent the operation of nosing into the pile of material, from tilting upwardly the forward end portion of the crawler it from the ground. As above explained, the strut D is pivotally connected at its rear end to the derrick B at 28 and is pivotally connected at its forward -end to the underside of the conveyor boom C at a higher elevation than the pivot II, as shown in Fig. 2, so that the strut D will always be inclined upwardly and forwardly when the machine is in operation. That is to say, the strut D is always upwardly inclined from the tractor A during operation so that the rearward thrust 7 during operation will keep the front end of the tractor A always in contact with the ground. The main thrust during operation on a pile of material is on the receiving end of the conveyor boom above the shoes Ill, since the width of the conveyor boom between the shoes I I4 is considerable while the shoes II! are vertical plates and consequently the rearward thrust on the side bars E is relatively small. Whatever tendency there might be for the side bars E to tilt the forward end of the tractor A upwardly is counteracted by only a small portion of the thrust on the strut D.

It should be particularly noted, however, that tilt upwardly the forward end of the tractor A.

In other words, the mounting of the boom C on the anti-friction rollers I" of the carriage F aflords ample freedom of movement of the boom C relatively to the derrick B during operation of the tractor A to thrust the receiving end of the conveyor G into the pile of loose material to be loaded.

Therefore any force transmitted to the boom C\due to the pushing of the loading machine into a pile of loose material on the ground, will be transmitted to the tractor A entirely through the strut D. This necessarily follows because the boom is free to slide longitudinally on the antifriction rollers I00 of the carriage F. The latter is suspended by the ropes III, I" from the top of the derrick B and therefore almost the entire weight of the boom C is sustained by the hoisting ropes IIII; I02 which are so arranged as to exert a downward pull on the derrick B. One component of this downward pull 'on the hoisting ropes is substantially parallel to the front angle irons II, by reason slide blocks 89 and SI, and consequently them t of the conveyor boom is downward thrust on thefront angleirons II atthe front end of o the tractor A. .This downward thrust adds to the downward thrust exerted by the strut D. Furthermore, there is no appreciable tendency for the rearward thrust on the conveyor boom C durin: loading operation to tilt the derrick B so as to lift the front end of the tractor A, for the reason that the boom 0 is free .to slide longitudinally on its carryingrollers III].

From the foregoing explanation. it will be seen that what little tendency there is for' the rearwardly because the-conveyor C is free to slide' on the carriage. Therefore the thrust. exerted on the strut D and the downward weight of the conveyor C on the front portion of the derrick will effectively hold the front end of the tractor A in eflicient traction contact with the ground during an operations of the machine in loadingcoal from the pile of loose material.

Referring .to Fig. 58 of the drawings, there is disclosed a modification .of the loading boom hoisting mechanism in that the anchorages for the hoisting ropes are located at I03 on the rear angle irons iii, and a confining track is aflorded for the carriage F. This track is formed by adding a pair of angle members Il'l adjacent the bottom of the loading boom in spaced relation to] the bottom angle irons II of the loading boom. In Fig. d'the plates II of Fig. i have been The loading boom C of Fig. 8 includes the lower angle members I5 as well as the reinforcing members "It'rf'lfhe lower angle members ill co-operate with theangle members it to form a cage within which the rollers I00 of the carriage F are confined. It is thus evident that the carriage F always moves vertically with the loading boom C and has a limited longitudinal movement relatively thereto. The carriage F is allowed to movefreely in a vertical direction with respect to the loading boom C but thismovement is limited by the upright reinforcing angle members IIIi acting as limit stops. This form of invention therefore differs from the form illustrated in Figs. 1 and 2, principally in that the carriage F is confined to the loading boom (2' for limited movement relatively thereto rather than being removable therefrom. It may also be noted that the cable Ilii by being anchored at Iii exerts a downward pull on the upper end of the derrick B in a direction to more effectively prevent upward tilting of the front end of the tractor A. In Fig. 9 there'is'illustrated afurthermodification of my invention comprising a pulley iii mounted on spaced-apart side bracket'plates it which may be upward extensions from the side plates l8 and I9 shown in Fig. 6, to form part of the cradle or carriage F", The cable ibi is anchored at I93" to the gusset plate 69 and extends downwardly so as to be reeved about the pulley H9 which occupies the relative position shown.

in Fig. 9 when the boom C is in its operating position shown in Fig'. 8. ',F" is of the same type as that shown atF' in The cradieor carriage Fig. 8 in that it is confined to move along the rails 15' and Ill between the limit stops "8.1m, but in Fig. 9 the vertical bracket plates I29 are added. I

It should, be understood that there is one puliey 9 on each side of the conveyor C on the cradle F" and that the rope III of Fig. 6 engages the pulley 8 on the opposite side from that shown in Fig. 9, the rope I92 being arranged in the same way that rope III is arranged in Fig. 9.

. The pulleys H9 are for the purpose of increasing the forces acting on the pulleys 81,, thereby assuring'a more intimate contact\between the friction blocks 89 and II and the front angle iron members 59- of the derrick B, when such additional frictional contact is desirable.-

What is shown in Fig. 9 isv in-addition to the construction shown in Fig. 8 in that the strut n,

the side bars E and themechanism connected therewith are retained.

In connection with the three forms of cradle or,carriage'F, F and F", shown respectively in Figs, 2, 8 and 9, the friction blocks .99 and ll are automatically elevated and lowered whenever the winch 590i Fig. 4 is operated to lift oriower the discharge end of the conveyor boom'C'.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the. claims hereto appended, and I therefore wish not to be restricted to the precise closed. g a

Having thus described and shown an embodiment of my invention, what I desire to secure b Letters Patent of the Unitedstates is:

I. In a portable loader, the combination with a truck, or a derrick on said truck comprising spaced masts, a conveyor boom carried between said masts, and having an end adapted to be thrust into a pile oi material, a carriage for sup porting said boom and permitting sliding oi mid construction herein dis-- boom relative thereto, said carriage having lsterally projecting shafts forwardly and rearwardly thereof, pulleys on said shafts, bearing blocks on said forward shafts adaptedto bear against said masts, pulleys adjacent the tops oi said masts, and cable means cooperating with said carriage pulleys and said mast pulleys for adjustingthe height of said carriage on said den-leis.

2. In a portable loader, the combination with a truck, of a derrick onsaid truck comprising spaced masts, a conveyor boom carried-between said masts and having an end adapted to be thrust into a pile of material, a carriage for supsaid truck and at the other end to the forward portion of said boom, brackets extending from said most, a boom support comprising spaced arms pivotally attached to said brackets, aroller extending between said arms, and a removable rod extending between said brackets spaced from the pivot points of said arms, said arms resting on said rod and thereby held in boom supporting position.

4. In a loader, the combination with a truck, of a derrick on said truck comprising spaced masts, a loading boom carried between said masts, brackets extending from said mast, a

.boom support comprising spaced arms pivotally attached to said brackets, a roller extending between said arms, and a removable rod extending between said brackets spaced from the pivot points of said arms, said arms resting on said rod and thereby held in boom supporting position.

5.-In a loader, the combination with a truck, of a derrick on said truck comprising spaced masts, a loading boom carried between said masts, a strut pivotally attached at one end to said truck and at the other end to the forward portion of said boom, brackets extending forwardly of said mast, a boom support comprising spaced arms pivotally attached to said brackets, a cross member extending between said arms upon which said boom rests when in transportating position, a rod extending between said brackets upon which said arms rest when said boom support is in non-operating position, a second rod extending between said brackets above said first mentioned rod for supporting said boom support in operative position, said second rod being removable.

6. In a loader, the combination with a truck, of a derrick on said truck comprising spaced masts, a loading boom carried between said masts, a strut pivotally attached at one end to said truck and at the other end-to the forward portion of said boom, brackets extending forwardly of said mast, a boom support comprising spaced arms pivotally attached to saidbrackets, a cross member extending between said arms upon which said boom rests when in transport ing position, a rod extending between said brackets upon which said arms rest when said boom support is in non-operating position, a second rod-extending between said brackets above said first mentioned rod for supporting said boom support in operative position.

7. A carriage for a loader boom comprising side frame members, flanges extending upwardly from said frame members, lateral members rigidly attached to said frame members, shafts extending laterally between said frame members, adjacent the front and rear of said carriage, non-friction rollers on said shafts adjacent each end thereof, pulleys on said shafts adjacent each end thereof, and flat faced bearing blocks carried on one of said shafts and extending latrally of said side frames.

8. A carriage for a loader boom comprising side frame members, lateral members rigidly attached to said frame members, shafts extending laterally between said frame members adjacent the front and rear of said carriage, non-friction rollers on said shafts adjacent each end thereof, pulleys on said shafts adjacent each end thereof, and flat faced bearing blocks carried on one of said shafts and extending laterally of said side frames.

9. A carriage for a loader boom comprising side frame members, flanges extending upwardly from said frame members, lateral members rigidly attached to said frame members, shafts extending laterally between said frame members adjacent the front and rear of said carriage, pulleys on said shafts adjacent each end thereof, and flat faced bearing. blocks carried on one of said shafts and extending laterally of said side frames.

10. A carriage for a loader boom comprising side frame. members, flanges extending upwardly from said framemembers, lateral members rigidly attached to said frame members, shafts extending laterally between said frame members adjacent the front and-rear of said carriage, non-friction rollers on said shafts adjacent each end thereof," pulleys on said shafts adjacent each end thereof, and bearing blocks carried on one of said shafts and extending laterally of said side'frames- 11. A carriage for a loader boom comprising side frame members, lateral members rigidly attached to said frame members, shafts extending laterally between said frame members adjacent the front and rear of said carriaganonfriction rollers on said shafts adjacent each end thereof, pulleys on said shafts adjacent each end thereof, and bearing blocks carried on one of said shafts and extending laterally of said side frames.

12. In a loading machine, the combination with I a supporting frame, of conveying mechanism comprising a conveyor frame having an end adapted to be thrust into a pile of material, a carriage confined to said conveyor frame for limited movement relatively thereto; limit stops on said conveyor frame for said carriage, and hoisting. mechanism connected to said carriage to move the same along said supporting frame while said conveyor frame has a limited movement longitudinally of itself along said carriage and relatively thereto as permitted by said limit stops.

13. In a loader, the combination with a supporting frame, of a carriage having bearing blocks and three pairs of pulleys, one pair at each end and one pair between and above the end pairs, conveyor mechanism comprising a conveyor frame associated with said carriage, and hoisting mechanism comprising hoisting ropes connected to said carriage by being reeved around said pulleys to effect adjustment of said conveyor frame relative to said supporting frame and to urge said bearing blocks against said supporting frame when adjacent said carriage and said conveyor frame.

STANLEY F. OSSING.