US3040918A - Material handling machine - Google Patents

Material handling machine Download PDF

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Publication number
US3040918A
US3040918A US739751A US73975158A US3040918A US 3040918 A US3040918 A US 3040918A US 739751 A US739751 A US 739751A US 73975158 A US73975158 A US 73975158A US 3040918 A US3040918 A US 3040918A
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Prior art keywords
bucket
conveyor
switch
material handling
shaft
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US739751A
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English (en)
Inventor
Daniel M Schwartz
Donald E Hendrickson
James D Brown
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Eimco Corp
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Eimco Corp
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Priority to US739751A priority Critical patent/US3040918A/en
Priority to BE579128A priority patent/BE579128A/fr
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0808—Improving mounting or assembling, e.g. frame elements, disposition of all the components on the superstructures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • E02F3/348—Buckets emptying into a collecting or conveying device
    • E02F3/3483—Buckets discharging on a conveyor or elevator mounted on the machine
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units

Definitions

  • MATERIAL HANDLING MACHINE Filed June 4, 1958. ll Sheets-Sheet 11 INVENTORS DANlEL M. SCHWARTZ B DONALD EHENDRICKSON JAMES D. BROWN ma/ J ATTORNEYS United States Patent 3,040,918 MATERIAL HANDLING MACHINE Daniel M. Schwartz, Donald E. Hendrickson, and James D. Brown, Salt Lake City, Utah, assignors to the Eimco Corporation, Salt Lake City, Utah, a corporation of Delaware Filed June 4, 1958, Ser. No. 739,751 1 Claim. (Cl. 214-131)
  • This invention relates to material handling machines of the type having a material gathering device pivot-ally mounted from a low material gathering position to an elevated material dumping position.
  • Another object of the invention is to provide such a machine for lifting, transporting and loading bulk materials in substantial quantities.
  • Another object of the invention is to provide an improved material handling machine having a pivotally mounted loader arm, and a conveyor adapted to receive the-mucked material and transport it upwardly and rearwardly.
  • a further object is to provide such a device wherein the support means for the material gathering structure provides the front support for the material conveying device.
  • Another object is to provide a device wherein support means for the material gathering structure has integral bumper plate means and the material gathering structure is provided with shock absorbing means which contact the bumper plate means during each cycle of said material gathering structure.
  • Another object is to provide such a machine having an improved fail-safe power cut-off structure with continually biasing means urging the cut-off structure to the off position so arranged that should means holding the cut-off structure to on fail, the cut-off structure would immediately move to the power off position.
  • a further object is to provide such a machine wherein the drive mechanism for the material gathering and discharging mechanism and/ or the drive mechanism for the material conveying structure are located on the opposite side of the machine from the manual controls for the operator.
  • a further object is to provide such a-machine having improved power cut-off means and an improved electrical control system for electrically actuated machines.
  • a material handling machine including a main frame, a shaft extending transversely across one end of said main frame, a housing secured to the main frame supporting the transverse shaft intermediate the extended ends thereof, an arm secured to each end of said shaft and supporting a material handling device between the extended ends thereof, a member having a curvilinear outer surface secured to one of the arms, flexible draft means trained about the curvilinear surface and connected to power actuated traction means carried by the main frame to pivot the arms and material handling device from a low material gathering position to an elevated material discharge position and to such a machine including conveyor means supported by the housing for the transversely extending shaft with the conveyor means adapted to receive material from the material handling device in its elevated discharge position.
  • FIG. 1 is a side elevational view of a machine incorporating the principles of the invention with the control panel removed;
  • FIG. 2 is a side elevational view of the other side of the material handling machine with the shovel bucket in the material discharge position;
  • FIG. 3 is an enlarged fragmentary front elevational view of the machine shown in FIGS. 1 and 2;
  • FIG. 4 is a fragmentary top plan view of the front end of the machine shown in FIGS. 1 and 2;
  • FIG. 5 is an enlarged fragmentary sectional view of the front end portion of the material handling machine of the invention.
  • FIG. 6 is a section substantially on line 66 of FIG. 5;
  • FIG. 7 is a section substantially on line 77 of FIG. 5;
  • FIG. 8 is an enlarged fragmentary detailed view of one of the idler roller tensioning mechanisms shown in FIG. 7;
  • FIG. 9 is a top plan view of the machine shown in FIGS. 1 and 2;
  • FIG. 10 is an enlarged fragmentary view in partial section of the rearward portion of the conveyor.
  • FIG. 11 is a diagrammatic view of an electric circuit for interconnecting an electric actuated bucket motor with manual and automatic control means.
  • a material handling and excavating apparatus embodying the principles of the invention which generally comprises a main frame 10 mounted on paired laterally extending crawler frames 12 and 14 carrying selflaying endless traction chains 16 and 18.
  • the main frame may be pivotally mounted to the crawler frames as disclosed in US. Patent No. 2,833,361, D. M. Schwartz, whereby the crawler frames may pivot relative to the body 10 with each of the crawler tracks 16 and 18 being 4 individually connected to a pair of selectively operable motors, one of which is shown in FIG. 1 and generally designated 2%.
  • Each of the motors is connected through suitable gear trains to a drive sprocket 22 positioned at the rearward end of the crawler frames, all as more fully described in Patent No. 2,833,361, hereinabove referred to.
  • the vehicle carries at its forward end a material handling structure 24 of the type adapted to load or gather material at a low forward position and to discharge the material at an elevated position.
  • the main frame of the vehicle also supports a material conveying apparatus generally designated 26 adapted to receive material from the material handling device at its forward end 28 and to convey the material upwardly and rearwardly to a discharge end 30 positioned rearwardly of the rear end of the main frame of the vehicle.
  • the material handling structure 24 includes a shaft 32 which extends transversely across the front end of the vehicle.
  • the shaft 32 is rotatably mounted in a housing 34 which includes a transverse barrel portion 36 carrying anti-friction bearing means 38 and 49 for the shaft 32 at its extended ends.
  • the shaft 32 has two end portions 42 and 44 which project beyond the respective bearings 38 and 40.
  • the shaft assembly also includes conventional rotary seal assemblies 46 and 48 between the barrel portion 36. of the housing and the shaft 32. End portion 44' of shaft 32 has secured thereto an arm 58 while end portion 42 of shaft 32 has secured thereto an arm 60.
  • the opposite end 62 of arm 58 is rigidly secured to a material handling device which is shown in the illustrated form of the invenas a shovel bucket 64.
  • the other arm 60 has its ex- -19 tended end 66 secured to the other side panel of the shovel bucket.
  • the foregoing construction provides a very satisfactory material digging and discharging unit as the paired arms 58 and 60 are rigidly connected to the extended ends 42 and 44 of the large transverse shaft 32 while the remote ends 62 and 66 of each arm are interconnected through the rigid bucket structure 64.
  • Each of the pivot arms 58 and 60 is adapted to receive a relatively long stroke shock absorbing piston and cylinder unit 61 which includes a cylinder 65, and a piston 66' slidably mounted therein and spring urged to an extended position by internal springs 6 shown in FIG. of the drawings.
  • the face of the pistons 66' are provided with slightly curved surfaces 70 which contact surface 72 on each of a pair of bumper plates 74 formed as integral portions of the housing 34 for the pivot shaft 32.
  • the pistons 66' are substantially fully telescoped within the cylinders 65 and the high discharge momentum of the bucket and pivot arms is effectively absorbed. It will also be appreciated that by securing the bumper plates 74 directly to the large housing 34, the impact shock transmitted to the vehicle during operation of the pivoted bucket material handling device is materially reduced.
  • the housing 34 includes, in addition to the barrel portion 36 and the pair of bumper plates 74, a pair of side plates 76 and 78 which extend downwardly and rearwardly from the barrel portion 36 of the housing and which are interconnected at their rearward ends by a connecting plate 80 extending transversely between the pair of plates 76 and 78.
  • the rear plate 80 projects above and below a web generally designated 82 which web adds rigidity to the housing assembly.
  • the web 82 is more clearly shown in FIG. 4 of the drawings.
  • the upwardly extending portion of the rear plate 80 is provided with a plurality of bores adapted to receive bolts 86 which connect the housing 34, which may be a fabricated structure or a casting, to a plate 88 carried by the front end of the main frame of the vehicle.
  • the depending portion of the end plate 80 is also provided with bores for bolts 90 securing the lower portion of the plate 80 to the forward end of the main frame of the vehicle.
  • each of the side plates 76 and 78 of the housing 34 is longitudinally channeled to receive thrust stops 92 and 94 which, as shown in FIG. 1, of the drawings, engage a portion of the rear panel of the shovel bucket 64 when the bucket is in its low material gather- -ing position and transmit a substantial portion of the material gathering thrust directly to the housing 34 and thence into the forward end of the main frame 10 of the vehicle.
  • the thrust elements 92 and 94 may be telescopically mounted in the longitudinal bores in the housing so that the lowermost position of the bucket 64 may be adjusted by removing pins 96 and repositioning the pins in other bores provided in the thrust members 92 and 94.
  • An upper series of longitudinal bores 98 is provided in the forward edges of the side plates 76 and 78 so that a more elevated pair of thrust stops may be employed with the device where it is necessary to contact the bucket at a more elevated position than is possible when employing the lowermost thrust stops 92 and 94.
  • the barrel portion 36 of the housing 34 includes as more clearly shown in FIGS. 3, 5 and 6 an arcuate opening to which is secured a panel structure 104.
  • the upper plate 106 of the panel structure 104 supports a limit, fail-safe cut-01f switch generally designated 108.
  • the switch 108 includes a base portion 110, supporting a standard 111, an arm 112 pivotally mounted thereto, contact means 114 opened and closed by appropriate movement of the arm 112 and a roller 116 mounted on the opposite end of the arm 112 remote from the contact means 114.
  • the arm 112 is spring urged to a switch-open position by a spring 115 whereby the roller 116 is maintained in engagement with the peripheral surface of a cam element 118 secured to the shaft 32.
  • the switch 108 is also so constructed that the roller end of arm 112 is the light end so that the arm is urged by gravity into the switch-open position in the event spring 115 should fail.
  • cam 118 includes a cut-back portion 120 which cut-back portion is in contact with the roller 116 of switch 108 substantially at the time the curved ends 70 of the bumper pistons contact the respective faces of their bumper plates 74.
  • the cam member is adjustable around the periphery of the shaft 32 by means of sets of bores in both the cam and shaft so that the point of power cut-off may be varied.
  • spring 115 which normally urges the roller end of arm 112 in an upwardly direction urges the arm to move to the switchopen position. Opening of the switch 108 cuts off the power to the bucket pivoting motor as to be more fully described hereinafter. Further these structures provide a fail-safe system in that should cam 118 be displaced or destroyed, the switch arm 112 is immediately moved to the off position.
  • the bucket 64 is actuated from the low material gathering position to the elevated dumping position by means of a member 124 carried by the end of pivot arm 60 remote from the bucket 64.
  • Member 124 is provided with a cam shaped outer surface 126 in contact with a flexible draft member shown in the illustrated form of the invention as a flat cable chain 128.
  • One end of the cable chain 128 is pin-connected to the arm 60 by pin 129 and when the bucket is in the low material gathering position as shown, for example, in FIG. 3, the cable chain 128 is trained about the curvilinear surface 126 of the member 124.
  • the curved surface 126 of member 124 is shaped to provide a large effective radius when the bucket is in the low material gathering position and a smaller elfective radius when the bucket is in the material discharge position whereby the pivot arms are provided with variable torque actuating means to provide a high-torque, lowspeed digging portion and a relatively low-torque, highspeed discharge portion, as more fully described in the Daniel M. Schwartz et al. Patent No. 2,746,625 issued May 22, 1956.
  • the other end of the cable chain 128 is connected to a reel 130 secured to rotate with a shaft 132 extending from, for example, a gear type speed reduction unit 134 which reduction unit is powered by a motor 136.
  • the motor 136 may be fluid pressure actuated or an electric motor or other suitable motors may be employed for rotating the pulley 130.
  • the cable chain 128 Wraps about itself on the pulley hub raising the bucket and the arms 58 and 60 from the material gathering to the material discharge position.
  • the form of the reel 130 which permits the cable chain to wrap about the hub of the pulley as the bucket is raised from the low material gathering position to the elevated dumping position augments the torque advantage provided by the curvilinear outer surface 126 of the cam arm 124.
  • the controls 143 for the pivot arm loader; 139 for the conveyor; and 141 for the groundengaging crawler units of the vehicle are positioned on that side of the machine remote from the cam arm 124, its flexible draft means 128 and the reel whereby the operator standing or seated on platform is in a protected position relative to the actuating mechanisms of the improved machine of the invention. It will further be seen that through the use of a single cam arm 124 and maintaining the entire drive mechanism for the pivot arm on the side of the vehicle remote from the operator permits the operator to obtain an unobstructed view of the material being mucked.
  • the upper surface of the rearward portion of side plates 76 and 78 are provided with integral bosses 100 and 102 for interconnecting and supporting the forward end of the conveyor 26 to the material handling machine as to be more fully described hereinafter.
  • the conveyor 26 includes spaced side walls 131 and 131, the lower ends of which flare outwardly to provide a material receiving bin having side walls 133 and 133 and a front end wall 138.
  • the side walls 133 and 133' and the end wall 138 are shaped to provide a substantially enclosed receiver for the bucket 64 when the bucket arms 58 and 60 are in the bucket discharge position as shown in FIG. 2 of the drawings.
  • a bed plate 140 suitably supported on transverse structural members 141.
  • the bed 140 receives, on the upper surface thereof, an endless conveyor chain 142 provided with laterally extending chain flights 144 which gather the material discharged into the hopper and conveys the material upwardly and rearwardly to the discharge end 30.
  • the return flight of the endless conveyor chain 142 is below the deck plate 140 as shown, for example, in FIG. 5 of the drawings.
  • an idler shaft 148 Positioned at the forward end 28 of the conveyor is an idler shaft 148 which is reciprocally mounted in front conveyor support members generally designated 150 and 152.
  • Each of the side plates of support members 150 and 152 of the conveyor is provided with a wing portion 154 and 156, respectively. These wing portions are bored and connected by pins 158 between the bosses 100 and 102 of the housing structure 34.
  • the rearward portion of the conveyor 26 is secured to the rearward deck portion of the main frame 10 of the vehicle by vertically extending structural members 160.
  • the lower ends of the members 160 are pin connected as at 164 to the rear end 166 of the main frame 10 of the vehicle while the upper ends are pin connected as at 168 to a bracket 170 secured to each side 131 and 131 of the conveyor.
  • the front idler shaft 148 has a centrally positioned sprocket formed thereon to provide a guide for directing the passage of the flexible conveyor chain 142 about the forward end of the conveyor structure and to insure rotation of idler shaft 148 with movement of conveyor chain 142.
  • the extended ends 182 of the shaft 148 are rotatably mounted in bearings 184 maintained in bearing blocks 1 86 provided with quadrangular ends 188 which are slidably received in an elongated trackway 190 formed in each of the front mounting members 150' and 152 for the conveyor.
  • the trackways 190 formed in each of the support members 150 and 152 are provided with enlarged portions 192 at their rearward ends whereby the bearing blocks 18 6 may be inserted in their respective trackways.
  • each of the bearing retaining blocks 186 is provided with plural bosses designated 194, 196 and 198.
  • Bosses 194 are received in the bifurcated ends 200 of guide shafts 202 which control the longitudinal reciprocating movement of the bearing blocks 186.
  • the bifurcated ends 200 are bored and connected by pins 204 to bearing block bosses 194.
  • the bifurcated end 200 of each guide shaft 202 is also provided with a lower seat for spring 206 while the other end of each spring abuts the end 208 of its respective conveyor support element.
  • Each of the ends 208 is :bored to receive a sleeve 210 to pnotect the threaded portion 212 of the guide rods 202 during reciprocation of the guide rods in the bores in the end plates 208.
  • the rearwardmost end of each sleeve 210 engages a capstan nut 214, threadedly mounted on the extended ends of the threaded portions of the guide rods 202 externally of the end plates 208.
  • Each of the capstan nuts 214 may also be provided with a pin 216 whereby the nuts may be pin connected to the extended end of its guide rod 202 in a normal operating position
  • the springs 206 maintain a predetermined forward pressure on their respective bearing retaining blocks 1'86 urging the roller forward against the endless conveyor chain 142 while permitting the chain to resiliently give in the event rocks and other foreign material lodge between the chain links which would normally interfere with the passage of the chain about the idler and drive shafts, thus relieving the conveyor chain of unnecessary strains.
  • the tensioning mechanism also provides the means whereby the conveyor chain may be manually placed in a slack condition for easy removal, replacement and repair.
  • each of the capstan nuts 214 is screwed toward the bifurcated ends of the guide rods.
  • the capstan nuts 214 are screwed downwardly until their inner faces are in engagement with the outer surfaces of plates 208 of their respective support members, further rotation of the capstans compress the springs 206 and slide the bearing blocks 186 toward the rearward ends of their tracks 190 formed in the conveyor support elements.
  • each of the bearing blocks 186 also includes bosses 196 and 198. These bosses are bored to receive the pins 204 which couple the bifurcated ends 200 of the guide rods 202 to the bosses 194. Between each of the pair of bosses 196 and 193, and maintained therein by pins'204, are plates 220 which are interconnected by, a depending rib 222 secured such as by welding to the under surface of a plate 224 corresponding to a front extension of the bed 140 of the conveyor. The most rearward edge of the bed extension 224, designated 226, is tapered to provide a narrow edge for sliding contact with the bed 140. It will also be noted 7 from FIG.
  • the conveyor chain 142 is driven from the discharge end 30 of the conveyor by sprocket 227 secured to live shaft 230 rotatably mounted in bearing blocks 232 secured to each side wall of the conveyor.
  • the shaft 230 also has secured thereto a sprocket 233 about which a drive chain 234 is trained.
  • the drive chain 234 extends about a pair of idler sprockets 236 and 238 and then about a driven sprocket 240 keyed'to the output shaft 242 of a reduction gear unit 244 driven by a motor 246 supported between the vertical support members 160 at the rearward end of the conveyor.
  • the lower flight of the drive chain 234 passes over chain guides 248 while the upper flight of the drive chain 234 is provided with guide elements 250.
  • the rearward portion of the conveyor 26 is disposed in a plane generally parallel with the bed of the main frame 10 of the vehicle.
  • the bed 140 of the conveyor 26 is apertured and an idler sprocket generally designated 222 is rotatably mounted in suitable bearings 224 with a segment of the barrel portion 226 of the idler sprocket 222 projecting through the aperture to engage the conveyor chain 142.
  • the toothed portion 228 of the sprocket 222 provides lateral stability to the conveyor chain and the location of the idler sprocket 222 supports the upper conveyor flight of the conveyor chain to minimize wear on the conveyor pan 140 in the area of the conveyor bend from the inclined portion to the generally horizontal portion.
  • the lower flight 230 of the conveyor chain 142 is also supported in the area of the juncture between the inclined and the horizontal portions of the conveyor structure.
  • the lower flight 230 is supported by a pair of idler sprockets 232 and 234.
  • Each of these idler sprockets rotate with motion of conveyor chain 142 and each is suitably supported in bearings carried bybrackets generally designated 238 which brackets are secured to the conveyor structure.
  • the lower idler sprocket 232 and the upper idler sprocket 234 for the lower chain flight 230 are positioned generally forwardly and rearwardly of the upper chain flight support and idler sprocket 222, whereby the lower flight 230 of the conveyor chain is elevated and the weight of the lower flight of the conveyor chain is effectively carried minimizing unnecessary loading and wear of the conveyor chain during its return flight.
  • the conveyor fully accomplishes the aims and objects hereinbefore set forth. It will also be apparent that other advantages are inherent in the improved conveyor structure.
  • the electric bucket motor is generally designated 136E.
  • the electric motor is manually controlled through bucket control level 143 having a bucketup position A, a neutral position B, and a bucket-brake position C.
  • the manual control lever 143 is mechanically linked to a switch 250 which is open when the control handle is in position A and closed when the control handle is in the neutral position B; a switch 252 which is closed when the control handle is in position A, the bucket-up position, and open when the control handle is in positions B or C; and a switch 254 which controls an electric brake for the electric motor 136E.
  • Switch 254 is open when the control handle is in positions A or B and closed when the control handle is in position C, the bucket-brake position.
  • the manual control handle 143 and switches 25%, 252 and 254 are of the type disclosed in U.S. patent application Serial No. 695,956, I. D. Brown.
  • the control system also includes switch 256 and switch 258 which are both normally open switches and are actuated in unison by a solenoid 260.
  • switch 256 and switch 258 which are both normally open switches and are actuated in unison by a solenoid 260.
  • the cam actuated switch 108 is also diagrammatically illustrated.
  • Solenoid 264 is energized by current from line L through lines 268 and 268a, and current from line L through line 266, switch 252, line 270, switch 258 and line 272.
  • Solenoid 260 for switches 256 and 258 is energized by current from line L through line 266, switch 250, line 274, line 274a and line 268]) which, in turn, is conneced to line 268. Solenoid 260 is also energized in parallel through line 266, switch 1%, switch 256 and lines 2741) and 274a.
  • the electric moto 136E is provided with a conventional direct current actuated brake energized by current from lines 266 and 268 connected to the primary windings of a step-down transformer 280.
  • the secondary winding of the transformer 280 is connected to a conventional dry plate rectifier 282.
  • the direct current output from the dry plate rectifier 282 is connected to the brake- :actuating winding 284 through conductor 286, and conductor Z88.
  • switch 252 When the bucket control handle 143 is in the neutral position, switch 252 is open, switch 250 is closed, solenoid 260 is energized closing switches 258 and 2545.
  • Switch 188 is closed when the bucket is in the low discharge position and the cam wheel of he switch 1% is riding on the high portion of cam 118 away from the low portion 12% of the cam.
  • Contactor coil 264 and the bucket brake 284 are not energized when the handle 143 is in neutral and the bucket after returning by gravity to its lowermost position would remain on the ground.
  • switch 254 With the control handle in the brake position C, switch 254 is closed, and the direct current brake for the elec tric motor 136E is energized and the contaotor coil 264 for switches 262 is not energized.
  • the bucket is elevated from the low material gathering position to the material discharge position where the power to the electric motor is cut off by the opening of limit switch 108 and the bucket returns to the ground or loading position by gravity.
  • manual control handle 143 In order to complete another cycle of loading and discharging and returning to the loading position, manual control handle 143 must be moved from the bucket-up position to the neutral position B and again moved into the bucket-up position.
  • the cutoff or limit switch 108 is opened by the force of the spring urging the pivot arm in a direction to open the contacts of the switch or by gravity should the spring normally urging the switch in the open position become inoperative. Further, a break in any one of the plural conductors or lines associated with switches 250 and 252 will also render the electric bucket motor 136E inoperative.
  • the new and improved fail-safe cut-oft switch 108 may be employed as the power cut-d means where the prime mover for the material handling structure is a pressure fluid motor, or an internal combustion engine or the like as the fail-safe switch may be connected to a valve in the pressure fluid system or to, nor example, a clutch where an internal combustion engine is employed as the motor means for the pivoted bucket loader.
  • a material handling machine of the type wherein a material handling device is secured to a shaft mounted for pivotal movement from a low digging position to an elevated material dumping position and an electric motor is drivably connected to means for rotating said shaft to actuate said material handling device from the low material digging position to the elevated material dumping position and means connecting the electric motor to a source of current;
  • said means connecting said motor to said source including a manually operated switch group including at least two manually operated switch elements, at least two normally open solenoid actuated switch elements, conductor means connecting the source of current to said motor serially through one of said manually operated switch elements and one of said solenoid actuated switch elements, conductor means connecting the source of current to the actuating solenoid through the other of said manually operated switch elements, a power cute-if switch actuated by said material handling device, and conductor means connecting the source of current to the actuating solenoid serially through said power cut-off switch and the other of said solenoid actuated switch elements, and in parallel with the manually operated switch element

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
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US739751A 1958-06-04 1958-06-04 Material handling machine Expired - Lifetime US3040918A (en)

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BE579128A BE579128A (fr) 1958-06-04 1959-05-28 Machine de manutention de matière

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4486049A (en) * 1981-08-29 1984-12-04 O & K Orenstein & Koppel Aktiengesellschaft Heavy breaking giant excavating equipment
US4702524A (en) * 1986-07-18 1987-10-27 Becor Western Inc. Continuous mining machine
US20180106017A1 (en) * 2013-10-11 2018-04-19 Hudson Bay Holding B.V. Electric Drive of Mobile Apparatus

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