US1404419A - Electrical industrial truck - Google Patents

Electrical industrial truck Download PDF

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Publication number
US1404419A
US1404419A US18046617A US1404419A US 1404419 A US1404419 A US 1404419A US 18046617 A US18046617 A US 18046617A US 1404419 A US1404419 A US 1404419A
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Prior art keywords
motor
shaft
truck
controller
lever
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William H Wright
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WRIGHT HIBBARD IND ELECTRIC TR
WRIGHT-HIBBARD INDUSTRIAL ELECTRIC TRUCK Co Inc
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WRIGHT HIBBARD IND ELECTRIC TR
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62BHAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B3/00Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
    • B62B3/04Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
    • B62B3/06Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
    • B62B3/0612Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground power operated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62BHAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00Accessories or details specially adapted for hand carts
    • B62B5/08Children's seats ; Seats or supports for other persons
    • B62B5/087Platforms to stand upon

Description

W. H.. WRIGHT. ELECTRICAL INDUSTRIAL TRUCK. APPLICATION H'LED JULY 13h91?.
1,404,41 9, Patented Jan. 24, 1922.
6 SHEETS-SHEET l.
INVENTOR m# mw w. H. WRIGHT. ELECTRICAL INDUSTRIAL TRUCK.
APPLICATION FILED JULY13|1917 1,404A; l 9 Patented J an. 24, 1922.
6 SHtETS-SHEET 2.
satte ey" W. H. WRIGHT.
ELECTRICAL INDUSTRIAL TRUCK.
APPLICATION FILED ILILY 13.19I1.
1,404,419, Patented Jan. 24,1922.
6 SHEETS-SHEET 3.
I NVENTOR Wlm# W. H. WRIGHT.
ELECTRICAL INDUSTRIAL TRUCK.
APPLICATION man Jun/13.1911.
6 SHEETS-SHEET 4.
, 1,404,419r Patented 1.111.211,1922.
l) his 1i-torpe] W. H. WRIGHT.
ELECTRICAL INDUSTRIAL TRUCK.
APPLICATION FILED JULY 13.1917.
Patented Jan. 24,1922..
6 SHEETS-SHEET 5.
INVENTOR www. 1.)/ 'his from y W. H. WRIGHT. ELECTRICAL mnusmm TRUCK.
APPLICATION FILED JULY 13.191?.
wILLIAnH'. WRIGHT, or BUFFALO,
ASSIGNMENTS, '10 WRIGHT-HIBBARD-INDUSTRIAL NEW YORK, ASSIGNOB, BY DIRECT AND ELECTRIC TRUCK CO. INC., Ol'
BUFFALO, NEW YORK, A CORPORATION OI NEW YORK. v
ELECTRICAL rNnUsTrAx, Tnuqx.
Application led July 18,
I T o all whom it may concern.'
= Be it known that I, WILLIAM H. WRIGHT, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Electric Industrial Trucks; and I do hereby declare thel following to be a full, clear, and exact description of my invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to iigures and references marked thereon, which form part of this specification.
Like figures of reference refer to like parts. y
The invention relates to new and useful improvements in industrial trucks, and more particularly to an-industrial truck which is driven by means'of an electric motor and wherein the load is carried by a platform or support which is likewise raised and lowered by power.
One of the objects of the invention is to provide an industrial truck of the above character wherein a single motor may be used for propelling the truck and also for raising and lowering the lift platform carrying the load.
A further object of the invention is to provide an industrial truck of the above character wherein the motor is controlled by independent controllers or controlling devices when operated for driving the truck and when operated for raising and lowering the lift platform, whereby the controlling device for the motor, when used in raising and lowering the platform, may be automatically thrown out so as to stop the motor and the movement of said platform.
A still further object of the invention is to provide a brake mechanism for the moving parts which raise and lower the platform, which brake mechanism is automaticall y actuated with the throwing out of the controller for the motor.
" Another object of the invention is to provide an industrial truck of the above character wherein an automatic switch and brake mechanism are associated with the motor and the mechanism driven thereby for propelling the truck, said switch and brake being controlled by a foot lever ad- Specieation of Letters Patent.
Patented J an.r24, 1922. 1917. serial No. 180,406.
jzcent a step-board for carrying the opera or.
These and other objects will in part be obvious and will in part be hereinafter more fully disclosed. n In the drawings, which show by way of illustration one embodiment of the invention Figure l is a side elevation of a truck embodying the invention;
2 is an end elevation' of the truck;
F ig. 3 1 s a top plan view of the truck;
F 1g. 4 is -a perspective view of the truck supporting wheels;
ig. 5 is an end elevation of the parts at the forward end of the truck;
Fig, 6 is a perspective view of the gear boxcontaining the train of mechanism for raislng and lowering the platform, and also showing the controller for the motor and the means for automatically throwing out,
the controller; .n
Fig. 7 is a perspective `View of a portion of the gear box and -showing the brake mechanism which is operated upon the throwing out of the controller;
Fig. 8 is a View, partly in side elevation and partly in section, showing more or less diagrammatically the elevating means for the platform;
Fig. 9 isa view in side elevation, showing more or less diagrammatically the supporting wheels and the steering mechanism for controlling the saine;
Fig. 10 is a view in side elevation showing the automatic switch and the brake controlled by the step-board;
F ig. 11 is a sectional view on the line of Fig. l2; A
Fig. l2 is a view, partly in plan and partly in section, or" the same, also showing the motor; and f Fig. 13 is a sectional view showing one of the springs for raising the step-board when released from the operators weight.
The invention consists broadly in an industrial truck having a supporting frame which is .mounted uponv a pair of driving wheels and a pair of supporting wheels. The supportingl wheels are disposed adjacent the front end of the truck, while the driving wheels are adjacent the rear end of the truck. Mounted on the frame is a supporting bracket carrying a motor, which is utilized both for the propelling of the truck and also for operatin a lifting platform or `and the two trains of mechanism or` earing, one of which operates the lift plat orm and the other of which propels the truck, are so constructed a's to connect the motor with either the one train of mechanism or the other. -Mounted on the frame, and in- -dependently of the mounting of the motor and the trains of mechanism above referred to. are bracket plates vwhich support a box or housing for a storage battery, which storage battery is located above the motor and the trainsof mechanism just described. A suitable controller is arranged intermediate the storage battery and the motor so that the motor may be actuated when connected with the train of mechanism for propelling the truck for giving three forward speeds and three reverse speeds. An entirely independent controller is disposed between thel .battery and the motor for causing the motor to be actuated for operating the train of mechanism which raises and lowers the plat` form. This last-named controller is automatically thrown out when the platform reaches either extreme of its movement. At the same time that the controller is thrown out, a brake is applied to the train of mechanism which raises and lowers the platform for stopping the same. An automatic switch is also included in the circuit which leads from the storage battery to the controller for the motor for propelling the truck, and
associated with this automatic switch is a brake.
The automatic switch and brake are in turn controlledby a foot lever and stepboard on which the operator rides, and this.
step-board is spring-operated so that when the operators weight is removed therefrom the automatic switch is cut out and the brake applied, which insures that the operator shall be in position on the step-board in orderA to operate the motor for propelling the truck. Suitable steering means is arranged so as to be accessible to the operator while standing on the step-board.
The invention will be made more clear by reference to the drawings, wherein the frame of the truck is shown as including two I-beams 1 and 2, forming stringers which are rigidly connected by plates 3 and 4 secured to the underside of the I-beams. Mounted on these I-beams and extending beyond the ends thereof are inverted T-bars 5 and 6. These T-bars are used to connect the main frame to the driving axle. Mounted on the T-bars are bracket plates 7 and 7a, the upper ends of which are connected by a bar 8 which may be used as a hand bar by the operator. Rigidly secured to one of the plates 7 is an angle bar '9 which is formed with a horizontal section l0 and a vertical section 11, said vertical section being connected to the T-bar 5. A similar angle bar is connected with the plate 7a and the T- bar 6. The sections 11 of these angle bars are Aconnected by a cross plate 12. These bracket plates and angle bars form a framework on which the box or housing 84 for the batteries is mounted. The batteries are located within this box or housing.
As a means for carrying the front supportin wheels I have provided cross bars 13 an 14 which are rigidly secured to the I-beams 1 and 2, and in these cross bars is journaled a longitudinally extending bar 15 provided with a circular portion or fifth wheel 16, which engages a similar portion 17 connected to the axle frame 18. Journaled upon the axle frame 18 are the supporting wheels 19 and 20. The axle frame has a projecting portion 21, to the outer end 22 of which is pivoted. a steering bar 23. This steering bar is utilized for turning the axle about its pivotal support on the bar 15, and it will be abvious that the bar l5 may rock in its journals so as to provide a very efficient supporting means for the truck frame even though the floor or ground on which the truck rests is more or less uneven.
The propelling wheels, as above noted, are located near the rear end of the frame and are indicated at 28 and 35 in the drawings. Fixed to the T-bar 6 is a yoke bracket 24 to which is vertically pivoted a forked bearing piece 25, This bearing piece 25 has a tubular extension 26 which carries the hub 27 of the wheel 28. The hub is journaled on they extension by means of ball bearings 29. Rigid on the end of the hub is a disk 30 which is connected with a stub shaft 31. The inner end of the stub shaft 31 terminates in a universal joint 32, the pivot points of which are in line with the pivot points 33 andv34 of the yoke 24. The Wheel 35 is mounted in a similar manner. Said wheel has a hub 36 rigidly fixed to a disk 37 which in turn is rigidly fixed to a stub shaft 38. Said hub is journaled on a forked piece 39 pivoted to a yoke bracket 40 which in turn is supported by the T-bar 6. The shaft 38 is connected by a universal joint 42 to one section of a drivconnected to these arms 43 and 44 vuniversal joint 42. The forked piece39 has an integral arm 43, and the forked piece 24 has a slmilar arm 44. A rod 45 is plvotally ing the same when steering the truck. Tt
will thus be seen that by movement of the steering rod 23 the rear wheels will be turned on independent pivotal supports, while the front pair of wheels will turn about a common pivotal support.
Referring more particularly to Fig. 9, it will be noted that the steering rod 23 is operated by means of a hand lever 47. -This hand lever is pivoted to the side bracket plate 7a at 48. Pivotally. connected to the hand lever 47 is a -rod 49 which in turn is pxivoted to a bell crank 50 at the point 51.
he bell crank 50 is pivoted at 52 to the frame of the truck. This bell crank has a downwardly extending arm 53 which is pivoted to a rod 54, one end of which is connected by a rod 55 to a sleeve 56 rigidly fixed to the steering rod 23. The lever 47 is moved in a vertical direction, for example, to the position shown in dotted lines at 47 a, when turnin the wheels for steering the truck, and this brings about a movement of t-he bell crank 50 and the parts connected thereto for shifting the steering rod 23 to simultaneously turn the driving wheels and the supporting Wheels.
The driving shaft 41, as above noted, is formed in sections which are connected respectively with the wheels 28 and 35 for propelling the same. The sections of the shaft 41 are connected with a differential set of gears of the usual type. Said gears, as herein illustrated, consist ,of a beveled gear which is connected to one part of the shaft 41 and a similar beveled gear which is connected with the other part of the shaft 41. These gears 57 and 57 mesh with four boveled pinions 58, 59, 60 and 61 which are carried by and moved bodily with a spur gear 62.
Rigdly mounted upon the rear axle ofthe truck and positioned above the shaft 41 is an electric motor 63 which is connected to and operates the shaft 64. This shaft is journaled in suitable bearings carried by the axle of the truck. Said motor is mounted on a bracket 63al which in turn is rigidly supported by vthe frame of the truck.
Loosely journaled upon the shaft 64 of the motor is a sleeve 65 which is formed at one end with an internal clutch gear, t he teeth of which are pointed at the outer face of the gear, and at the other end of said shaft is a pinion 66. The pinion 66 is adapted to and servesA 'idly fixed to a shaft 86 mesh with a gear 69 fixed to a shaft 70 which is journaled 1n suitable brackets on the axle of the' truck. Fixed to the shaft 70 is a pinion 71 which meshes with the gear 62 of the differential. The shaft 64 is provided with a portion which is square in cross section, as indicated at 72. Mounted on this square portion of the shaft 64 is a sleeve 73 which is fitted to the cross section of the shaft so that said sleeve turns with the shaft. This sleeve 73 is formed with a pinion 74 at one end thereof which is of the proper size and shape to fully pass into the internal gear 67 and engage the teeth 68 thereof. Said sleeve 73 is provided with a section 75 at its opposite end which has a recess 76 adapted to receive the ends 77 and 78 of a yoke piece 7 9. This yoke piece 79 has sliding engagement witha supporting pin 8O fixed in a bracket carried by the axle of the truck. Extending upwardl from the yoke ieee 79 is a lug 79". Loose y passing throug an opening in this lug is a rod 81. A nut 79c is threaded onto the rod before it is inserted into the opening, and then a nut '79h is threaded onto the other end of the rod. lA coiled spring 7 9 is disposed between the nut 79n and the lug, and a separate coiledl spring 79d is disposed between the nut 791 and said lug. These springs tend to hold the lug 79a in an intermediate position, and at the same time Will permit a yielding pressure to be applied to the sleeve 73 for shifting the pinion 74 into mesh with the internal gear for connecting the motor4 with the driving wheels for propelling the truck.
The rod 8l is pivoted at the lower end of a lever 82, as shown in Fig. 2 of the drawings. This lever 82 is pivoted at 83 to the battery box or housing 84. Fixed to said box 84 is a stop piece 82a having a central lug 82h against which the lever 82 rests on either side thereof but over which lug the lever can pass so that the lever may be placed on either side of said lug 82b and will rest against the same.
As a means for raising the lift platform, the pinion 74 may be caused to mesh with a' gear 85 which is connected through a train of mechanism to the lifting devices for the platform. The teeth of the gear 85 on the side thereof adjacent the internal gear G7 are pointed so as to facilitate the meshing of the pinion 74 therewith. Both ends of the teeth on the pinion 74 are pointed to further facilitate the intermeshing of the teeth of this pinion with either the internal gear 67 or the gear 85. The gear 85 is rigwhich is journaled 1n, an extension 87 of the gear box 88. A beam 90 connects the extension 87 on the gear box with the bearing 89 of the motor and insures the proper relative positions of the axes of the shafts 64 and 86. Journaled in the lower part of the gear box 88 is a shaft 91 which is connected to the shaft 86 by means of a train of reduction gears. This train of gears consists of a pinion 92 keyed tothe shaft 86 and meshingwith the gear 93 jou'rnaled on a shaft Y94. igidly fixed to and concentric with the gear 93 is a pinion 95 which meshes with a gear 96 `journaled upon the shaft 91. Rigidly connected with the gear `96 and journaled upon the shaft 91 is a pinion 97 which in turn meshes wlth the gear 98. Rigidly connected with the gear 98 is a pinion 99 which meshes with a gear 100 keyed to the shaft 91. The shaft 91 is mounted in journals 101 on the outside of the box 88, and a crank piece 102 is carried by the end of the shaft 91. This crank piece 102 is pivoted to a rod 103 which 1s moved back and forth for elevating the platform. Fromthe above description, it will be apparent that this crank piece 102 is operated from the motor shaft by means of the pinion 74 meshing with the gear 85 and through this reduction train of gearing. The means for raising and lowering the platform consists of inclined blocks 104-104 mounted on the cross plate 3 and disposed adjacent the I-beams 1 and 2. Mounted upon the cross plate 4 is a similar pair of inclined blocks 105-105. Disposed in sliding engagement with the pair of blocks 104 is a pair of inclined blocks 106, and likewise in sliding engagement with the blocks 105 is a pair of inclined blocks 107. Each of the blocks 104 has a horizontal upper fiat portion 104, and the blocks 105 have similar portions 1058. The blocks 106 and 107 are carried by the platform. The platform, as herein shown, consists of a skeleton structure formed of angle bars 108 and 109 placed so that one section of each angle bar is horizontal, while the other section is vertical and lies adjacent the frame sections 1 and 2 of the truck. Rigidly fixed to the underside of the horizontal sections of the angle bars 108 and 109 are plates 110, 111 and 112. The plate 112 is in the form of an angle iron with one edge extending upwardly above the surface of the angle bars 108 and 109. These plates, together with the angle bars 108 and 109, form, as above noted, a skeleton platform which is adapted to carry the load.
Secured to the bars 108 and 109 are the inclined blocks106 and 107, and these inclined blocks are disposed so as to have their inclined faces in contact with the inclined faces of the blocks 104 and 105. vThe blocks 106 are each provided with a lower flat portion 106a and an upper horizontal flat portion 106". Likewise the blocks 107 each have a lower fiat portion 107a and an upper flat portion 107".v The range of movement of the blocks is such that, when the platform is at the lower extreme of its movement, the
\ 111 and the rod 103 is pivoted to this bracket.
From the above description it will be noted that as the shaft 91 rotates, the crank piece 102 will be rotated, and this operating Vthrough the rod 103 will pull the platform in one direction or push the platform in the opposite direction. A pull on the platform will cause the'inclined blocks 106 and 107 to move up the inclined blocks 104 and 105, thus raising the load, and then again, through a movement of the crank piece 102 and a push on the rod 103, the inclined blocks will slide down upon each other and gradually lower the load. The range of movement of the crank piece is such as to bring the flat portions 106 and 107el above the fiat portions 104a and 105, respectively, so that the weight is carried by these flat portions rather than by the inclined faces of the blocks, and this ytakes the weight off of the crank piece 102.
As a means for automatically stopping the motor when the platform has reached the extremes of its movement, I have provided the crank piece 102 with diametrically opposed ears 114 and 115. The ear 114 carries a pin 116, and tihe can 115 carries a p-in 117. The pins are an equal Vdistance from the center of rotation of the crank. Pivoted upon the sides of the gear box 88 at a point 118 is a trip lever 119. Said trip lever is pivoted nearer one end than the other so that the weighted end of the lever 119, when said lever is free, lies in the ath of travel of the ins 116 and' 117. 'ecured to the top of tlie gear box 88 are two brackets 120 and 121 in which is freely journaled the shaft 122. This shaft carries an arm 125. A spring 126 is secured at one end to said arm', and at the other end to the gear housing, and 'serves as a means for rotating the shaft 122 in a counterclockwise direction. The lower end 128 of the arm 125 is adapted to make contact with the end '129 of the lever 119. Projecting upwardly from the shaft 122 is an arm 124 which is pivotally connected to a link 140, which in turn is pivoted to a hand lever or controllin lever 141 pivoted at 142 to the bracket p ate 7. An upward movement of the end of the hand 1ever`141 will move the shaft'122 in a clockwise direction and swing tlhe arm 125 against the force of the spring 126.
Mounted onI the gear casing or box 88 is a controller 130 for the motor. Said controller is of the usual construction for giving one speed to the motor, and the con-` troller is connected to and operated by a rod 137 which is connected by a link 138 to an arm 123 rojecting upwardly from the shaft 122. he upward movement of the outer end of the hand lever 141 turning the shaft 122 in a clockwise direction pushes in on t-he rod 137 and closes the controller so as to permit the current from the battery to flow to the motor. Assumingy that the gear 74 is in mesh with the gear 85, the motor will turn the gear 85, and through the reduction gearing turn the shaft 91 and raise or lower the platform, depending upon the position of the cra-nk ie'ce 102. Just as soon as the pins 116 an 117 move from the extreme upper vertical position, the weighted end of the lever 119 is released so that it drops, throwing the end 129 into the path of movement of the arm 125. If the operator releases the hand lever 141, the spring merely pulls the arm 125 against the end of the tri lever 119, and the parts will remain locke in this position until the crank piece 102has moved through an arc of 180O or thereabouts, which brings the other pin into contact with the lever, causing the same to be raised and throwing the end 129 downward out o'f the path of the lever 125, and the spring 126 will then at once oscillate the shaft 122 and throw the controller out, thus cutting off the current from the motor.
Mounted on the shalft 86 is a brake drum 143 around which is a brake band 144. This brake band is connected at the points 145 and 146 to a lever 147. This lever is in turn connected by a link 149 to an arm 148 extending downwardly from the shaft 122. 1t will at once be noted that when the shaft 122 is turned in a counterclockwise direction, as viewed in Fig. 6, then the lever 147 will be swung about its central fulcrum so as to force the brake band into contact with the brake drum. This is accomplished by the well-known positioning and roportioning o'f the parts of lthe lever. Xs a result, the motor is not only disconnected from its source of power when thel platform ,reaches the extreme of its movement, but a brake is applied to thetrain of mechanism between the motor and the lift platform fo stopping said' train olf mechanism, v
In the present construction, no great harm would be done by the continued movement of the shaft of the crank piece 102 after the lift platform has reached either of the extremes of its movement, for the reason that after the crank piece is moved so as to raise the platform a continued movement of the crank piece will` lower the platform, but it is desirable to stop the li'ft platform when the flat portions of the inclined blocks are in engagement, and also when the load is clear up or when the platform is clear down. It is understood that these industrial trucks are used in connection with tables or carriers having supporting legs-of such heightas to permit the truck to be driven by the operator underneath the table, and then, when the platform is raised, the table is lifted thereby, thus takin the load from the ground or floor. For t is reason, it is extremely desirable that the lift platform shall be stopped in its movements up and down when either at its eXtreme lower position `or at its extreme upper position. This is accmpli shed by the automatic means for cutting out the controller and applying the brake. It will also be noted that as soon as the mechanism is set into operation lfor lifting the load, the operating mechanism is out of control of the operator and is under the control of the latch lever 119 until the parts have moved through the desired distance, when the latch lever is released, the controller automatically cut out, and the brake applied.
In order that the motor may operate to raise the lift platform, the pinion 74 mustbe placed in mesh with the gear 85. This is accomplished by shifting-the lever 82. When the lever 82 is in the position shown in Fig. 2 of the drawings, then the rod v81 is pulled so as to compress the spring 79d, and this presses against the lug 79a, forcing the fork 79 sidewise, said fork sliding on the pin 80, and through its connection with the sleeve 73 said fork will force the pinion 74.
into mesh with the pinion 85. It is noted that this pressure brought to bear on the pinion 74 to cause it to mesh with the pinion 85 is' a yieldingpressure and just as soon as the teeth of the pinion gear are brought so that they can mesh, then they w1ll slip into each other. When the lever is thrown in the opposite direction, then through the spring 7 9c the fork. is forced so as to cause the pinion 74 to mesh with the internal gear 67. The clutch gear 67 and gear 85 are so disposed that the inion is either in mesh with one or the other or both of the gears at all times. There is no intermediate posltion when the gear is out of mesh with both pinions. This means4 that the motor is always connected with either the tram of mechanism for propelling the. truck or the train of mechamsm for xraising or lowering the latform.
T e battery current for operating the motor for propelling the truck is controlled by an automatic switch 150. The wires leading to the switch are connected at 150 and 150". The switch is controlled by a rod 151.
When this rod is in its raised position, the switch, which is the ordinary knife switch is closed and the wires 150l and 150b are connected. -The rod 151 is connected to a brake lever 152 which in turn is connected to a brake strap 153 encircling a drum 154 speeds and three 'motor in certain relations to each other.
' is operated so formedl on-the outer face of the internal gear 67 A spring 152 connected at 155 to the lever 152 pulls down on the rod 151 and tends to disconnect the switch and also to apply the brake strap to the drum to place a brake upon the movement of the parts which are connected to the drivin wheels for propelling the same. rlhe ro 151 is connected to the lever 152 through a link 156.
Mounted at the -forward end of the truck is a step-board 162. Said step-board is carried hy arms 160 and 161. which are journaled upon a rod 157. Said arm 16Q is provided with a shoulder 163. A pin 164 (see Fig. 13) lis mounted in a casing 165 and spring-pressed against the shoulder 163 by the compression spring 166. Said spring is seated against the adjustable abutment 167 threaded into the casing 165. By adjusting this abutment, the pressure of the spring may be varied. The arm 161 has a similar shoulder against which a similar springpressed pin bears. These springs 166 are of -suflicient strength to cushion the weight of an o erator standing on the step-board 162, an by adjusting the abutment 167 the springs may be made to suit the weight of the operator. Also journaled on the rod 157 is a foot lever 158, and this foot lever is connected by the rod 159-to the lever -152 which operates'the rod 151 and the Vbrake band 153. vThe step-board, when released from the weight of the operator, is raised up against the foot lever '158. The operator standing on the step-boardv presses on the foot lever so as to raise the. rod 151, close the switch, and also shiftv the lever 152 to release the brake. When the operator steps off of the step-board or releases the foot-lever, then the upward movement of the foot lever and the upward movement of the steplboard will cause the rod 151 to move downward, opening the switch, and shifting the lever 152 to apply. the brake.
As a means for controlling the motor for propelling the truck, I have .provided a controller, indicated at 177 in the drawings. Said controller is of the usual construction and may be provided with three forward reverse speeds accomplished by connecting the circuits of r1tlllle e controller is operated by a rod 176 which is connected to an arm 175, and this arm is in .turn connected to a link 174 connectedto the lower end of' a rod 173. The rod 173 is pivoted toa link 172 which in turn is connected to the hand lever 171 pivotedvto moving the hand the bracket plate 7.. By lever 171 in one direction, the controller 177 'aS to give the first forward f speed, or the second forward speed, or the third forward speed. By moving the lever in the opposite direction, then the reverse.`
vLana-.1.19
motion of the motor is given and the truckr driven in the opposite direction. It is not throught necessary to go into the details of'this controller. as it -may be of any suitable construction to bring about a proper driving of the truck. The essential feature, however, consists in a controller which has a neutral position so that the controller may be thrown entirely out of operation and the motor stopped and a second or independent controller used for actuating the motor for moving the lift platform up and down. Another essential feature o-f the controller consists in the forward and reverse movements of the truck brought about through the movements of the motor, which are directly connected to the truck propelling wheels and remain in connection for all speeds and for the forward and backward travel 'of the truck.
In operation, the operator stands upon the step-board and he resses the foot lever 158, which willclose the switch and release the brake on the driving mechanism for the truck. The lever 82 is then shifted to cause the pinion or gear 74 to mesh withthe internal clutch gear 67. This connects the motor with the driving. wheels 28 and 35. rlhe hand lever 171 is theneither raised or lowered, depending upon which way it is desired to propel the truck, and the truck may be moved forward at different speeds orbackward. When the truck is under motion, it is impossible to shift the lift platform or load carrying means as the motor is entirely disconnected from the elevating means, that is, the means for raising and lowering the platform. Assuming the platform. is down and itis desired to lift a load, the truck is driven soas to carry the platform underneath the load, after which the truck is stopped. yThe hand lever 82 is then shifted to bring lthe pinion out of mesh with the internal gear and thus disconnect the motor entirely from the driving wheels, and at the same time connect the motor with the reduction gearing which operates the crank piece 102 and thus raises and lowers the platform. The hand lever 141 is then operated so as to close the controller 130 and connect the motor to the battery so that the train of mechanism will be set into operation and the crank piece 102 rotated. When the crank piece has traveled a proper distance to raise the platform to its extreme upper position, then the trip lever releases the arm 125 which is automatically thrown by the spring 126 to 'cut out the controller 130 and apply the brake to the moving parts and thus stop the lift platform at its extreme upper position.
ikewise, when the lift platform 1s at its extreme lower position, the Acontroller is automatically cut out. v
From thefabove, it will be noted that I have provided an industrial truck wherein .a single motor may be utilized for either propelling the truck or raising and lowerin the platform which supports the load, an the operation of the truck and also the movement of the platform are electrically controlled, as distinguished from the use of shifting clutches. By this arrangement, the motor is always connected with either one train of mechanism or the other, and all likelihood of the overspeeding of the motor is done away with. Furthermore, the control of the lifting mechanism is very much more eiicient as the motor is connected therewith when the stopping of the .movements of the parts is brought about, and this aids greatly in the ease with which the parts may Ibe stopped.
It is obvious that minor changes may be made in the details of construction and the arrangement of the parts without departing from the spirit of the invention as `set forth in the appended claims.
Having described my invention, I claim,
l. An industrial truck including in combination, a supporting frame, supporting and driving wheels therefor, elevating and carrying means mounted on the frame, a brake for said elevating means, a motor, means for connecting said motor either to the driving wheels for propelling the truck or to the elevating means for lifting the load, a controller for the motor, whereby said motor may bev operated in either direction when connected to the driving wheels, a separate controller for the motor, whereby said motor may be operated when connected to the elevating means, .and automatic means for throwing out said last named controller and applying the brake when the elevating means reaches predetermined positions.
2. An industrial truck including in combination, a supporting frame, supporting and driving wheels therefore, elevating and carrying means mounted on the frame, a
brake for said elevating means, a motor, aV
' shiftable device for connecting saidmotor either to the driving wheels for propelling the truck or to the elevating means for lifting the load, a controller for the motor, whereby said motory may be operated in either direction when connected to the driving wheels, a se arate controller for the motor, whereby sai motor may be operated when connected to the elevating means, and automatic means for throwin out said last named controller and applying the brake when the elevatingmeans reaches the predetermined positions.
3. An industrial truck including in combination, a supportin frame, supporting and driving wheels t erefor, elevating and carrying means mounted on the frame, a brakefor said 'elevating means, a motor,
means for connecting said motor either to the driving wheels for propelling the truck or to the elevating means for lifting lthe load, a controller for the motor, whereby said motor may be. operated in either direction when connected to the driving wheels, a separate controller for the motor, whereby said motor maybe operated when connected to the elevating means, an oscillating shaft connected to said last named controller, a lever connected to said shaft, a spring for moving' said lever for throwing the controller to stop the motor, a latch for holding said lever from movement by said spring,
-and means for releasing the latch when the elevating means reaches predetermined positions.
4. An industrial truck including in combination, a supporting frame, supporting and driving wheels therefor, elevating and carrying means mounted on the frame, a
brake for said elevating means, a motor.
means for connecting said motor either to the driving wheels for propelling the truck or to the elevating means for lifting the load, a controller for the motor, whereby -said motor may be: operated in either direction when connected to the driving wheels, a separate controller for the motor, whereby said motor may be operated when connected to the elevating means, an-oscillating shaft connected to said last named controller,.a lever connected to said shaft, a spring for moving said lever for throwing thel controller to stop the motor, a latch for holding said lever from movement by said spring, means for releasing the latch when the elevating means reaches predetermined positions, and a. brake for said elevating means controlled by said shaft, whereby said brake is applied when the controller is shifted to stop the motor.
5. An industrial truck including in com-vy bination, a supporting frame, supporting Y motor whereby said motor may be operated whenconnected to the raisingand lowering means, and automatic meansr throwing out said ylast-named controller when the platform reaches predetermined extreme positions.
6. n industrial truck including in combination, a supporting frame, supporting and driving wheels therefor, a. load carrying'platform mounted on the frame, raisiso v means, and automatic means for throwing ing and lowering means for said platform, a brake for said-*raising and lowering means, a motor,means for connecting the motor to the driving wheels for propelling the truck,
means for connecting the motor ti. the rais-- ing yand lowering means fo;` raising and lowering the platform, a controller for the motor whereby said motor may be operated in either direction when connected kto the driving wheels, a second controller for the motor whereby said motor may be operated when connected to the raising and lowering out said last-named controller and applying the brake when the platform reaches predetermined extreme positions.
7 An industrialtruck including in combination, a supportingAux frame, supporting one train of gears to the other, whereby said motor is at all times connected with one of said trains of gears, and means for shifting said gear connected with the motor includinga lever and interposed vs rings, a stop for holding said lever inv eit er of` its YeX- treme positions'and said springs operating to cause. a meshing of the gear connec with the motor with the gears of the respective trains of gears for operating the elevating means and the driving wheels.
, 8. An industrial truck lncluding in combination, a supportin frame, supporting and driving wheels t erefor, a llft table mounted on said frame, devices forl raising and lowering said -table when said table is. moved endwise of the truck, a shaft, a crank carried' by said shaft, a link connectingsaid crank to said table for moving said table endwise, a motor, a train of ears connecting said motor lvwith said sha a controller for said motor, an oscillating shaft connected to said controller, a depending lever carried by -said oscillating shaft, a spring for moving said shaft to operate the con-4 troller to stop the motor, a latch for hold- 1ng said lever against the action of the spring and with the controller closed, opposite y disposed members carried by the shaft for operating the lift table and adapted alternately to engage the latch to release the lever'so as to stop the motor when said table 1s in extreme raised and lowered positlons.
9. An industrial truck including in combination, a supportingfraine, supporting and driving wheels therefor, a lift table mounted on frame, devices for raising and lowering table when said table is moved endwise of the truck, a shaft, a crank car-- ried by said shaft, a link'connecting said crank to said table for moving said table endwise, a motor, a train of gea-rs connecting said motor with said shaft, a controller for said motor, anoscillating 'shaft vconnected to said controller, a depending lever carried by said oscillating shaft, a spring for, moving said shaft to operate the controller to stop the motor, a'latch for holding said lever against the action of the spring and with the controller closed, oppositely7 disposed members carried by the shaft for` operating. the lift table and adapted alter" nately to engage the latch to release the lever so as to stop the motor when said table is in extreme. raised and lowered positions, a brake for said train of gears, and means operated by said oscillating shaft connected to the controller for applying the brake when the motor is'stopped.
10. lAn industrial truck including in combination, a supporting frame, supporting and driving wheels therefor, 'a lift 'table mounted on said frame, devices for raising and lowering said table when said table is moved endwise of the truck, a shaft, a crank carried by said shaft, a link connecting is'aid crank to said table for moving said table endwise,y a' motor, a train of gears connecting said motorv with said shaft, a controller for said motor, an oscillating sli-aft connectedto said controller, a depending lever carried by said oscillating shaft, a spring for moving said shaft to operate the controllerto stop the motor, a latch for holding said lever against the action of the spring and with the controller closed, op-
pitely disposed members carried by the shaft 'for operating the lift table -and adapted alternately to engage the latch to release the lever so as to stop. the motor when said table is in extreme` raised .and lowered positions, a train of gears connected with the driving wheels, and means for disconnecting the motor from said train of gears connected with the shaft for raising and lowering the table and for connecting y said motor with the train of gears connected tothe driving wheels.
11. An industrial truck including in com- V'bination, a supporting frame, supporting and driving wheels therefor, elevating and carrying means mounted on the frame, a brake for, the carrying means, a brake for the driving wheelsa,motor, a shiftable device for connecting the motor to the driving wheels for pro lling the truck or the elevating means or lifting ,the`load, a controller for the motor, whereby the motor y of the inclines on the sus controller ispositioned so as to disconnect the motor the brake is applied, a separate` controller for the motor, whereby said motor may be operated when connected to the elevating means, and automatic means for throwing out said last named controller and applying the brake to the elevating means vwhen said elevating means reaches predetermined positions.
12. An industrial truck including in com-v bination, a supportin frame having blocks formed with incline faces terminating at their upper ends in horizontal flat faces, a platform having inclined blocks associated with each block on the frame, said blocks on the platform having inclined faces terminating both at their upper and lower ends in flat orizontal faces, said blocks being dis osed so that the flat faces at the lower en s of the inclines on the platform will rest on the flat faces at the upper ends of the inclines on the frame when the platform is raised, and the flat faces at the upper ends latform will rest on the flat faces` of the when the platform is in its lowered osition, means for raising and lowering t e platform, a motor connected with said means, a
controller for said motor, and automatic means for cutting [out the .controller when the flat faces are brught into engagement with each other.
13. An industrial truck including in combination, a supporting frame, a platform, means for raisin and lowering the latform when the p atform is moved en wise relative to the frame, means for movin the platform endwise including a rotating s aft, a crank piece carried thereby, a motor, reduction gearing between the motor and the shaft carrying the crank piece, a controller for said motor, an oscillating shaft connected to the controller, a hand lever connected to said oscillatin shaft, a depending arm carried by the osci lating shaft, a s ring connected thereto for movin the sha to open the controller, a latch or controlling the movements of said arm, and means movable with the crank piece for lifting the latch locks on the frame .f to release the arm when the platform reaches predetermined extremes of move- )ment 14. An industrial truck including in combination, a supporting frame, a platform, yzmeans for raisin and lowering the lat- `form when the p atform is moved en wise "relative to the frame, means for movin the platform endwise including a rotating s aft, a crank piece carried thereby, a motor, re-
duction gearing between the motor and the shaft carrying the crank iece, a controller for said motor, an oscil ating shaft connected to the controller, a hand lever counected to said oscillating shaft, a depending arm carried by the oscillating shaft, a spring connected thereto for movin the shaft to open the controller, a` latch or controlling the movements of said arm, arms extending laterally from the crank piece and carrying diametrically opposed pins adapted to eugage the latch for releasing the same when the platform reaches predetermined extremes of movement. s
15. An industrial truck including in combination, a supporting frame, a platform, means for raisin and lowering the latform when the p atform is moved en wisc relative to the frame, means for movin the vplatform endwise including a rotating s aft, a crank piece carried thereby, a motor, reduction gearing between the motor and the shaft carrying the crank iece, a controller for said motor, an osci ating shaft connected t0 the controller, a hand lever connected to said oscillating shaft a depending arm carried by the oscil ating shaft, a spring connected thereto for movin the shaft to open the controller, a latch for controlling the movements of said arm, means movable with the crank piece` for lifting the latch to release the arm when the platform reaches predetermined extremes of movement,I a brake drum turning with the reduction aring, a brake strap surrounding the rum, aylever connected with the brake stra and a arm carried b the oscillating sha t and connected'with t e lever for appl ing the brake when the shaft is oscillated or opening the controller.
uffalo, N. Y. Jul
WIL
1i, i917. IAM H. WRIGHT.
US18046617 1917-07-13 1917-07-13 Electrical industrial truck Expired - Lifetime US1404419A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0485257A1 (en) * 1990-11-08 1992-05-13 Loc Manutention Foldable platform with automatic locking, especially for pallet-trucks or stacker-trucks
FR2743551A1 (en) * 1996-01-16 1997-07-18 Fenwick Linde CONVEYOR TROLLEY WITH CONDUCTOR PLATFORM
US20080197588A1 (en) * 2007-02-15 2008-08-21 The Toro Company Platform assembly and working vehicle incorporating same
EP2014605A1 (en) * 2007-07-09 2009-01-14 BT Products AB Load lifting device and a platform for a load lifting device
EP2301827B1 (en) * 2009-09-21 2018-07-18 OM Carrelli Elevatori S.p.A. Storage truck, in particular lift truck

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0485257A1 (en) * 1990-11-08 1992-05-13 Loc Manutention Foldable platform with automatic locking, especially for pallet-trucks or stacker-trucks
FR2669015A1 (en) * 1990-11-08 1992-05-15 Loc Manutention FOLDING PLATFORM WITH AUTOMATIC LOCKING, IN PARTICULAR FOR TROLLEYS OF THE TYPE TRANSPALETTE OR GERBEUR.
FR2743551A1 (en) * 1996-01-16 1997-07-18 Fenwick Linde CONVEYOR TROLLEY WITH CONDUCTOR PLATFORM
US20080197588A1 (en) * 2007-02-15 2008-08-21 The Toro Company Platform assembly and working vehicle incorporating same
US7980569B2 (en) 2007-02-15 2011-07-19 The Toro Company Platform assembly for use with working vehicle
EP2014605A1 (en) * 2007-07-09 2009-01-14 BT Products AB Load lifting device and a platform for a load lifting device
EP2301827B1 (en) * 2009-09-21 2018-07-18 OM Carrelli Elevatori S.p.A. Storage truck, in particular lift truck

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