US 1996618 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
April 2 1935.
H. J. H. HUBER ,ELEVATING AND TRANSFER TRUCK UNIT l Filed Feb. 18, 1953 Invehtr: I Herman clII-Iuber b9 w/yvwe@ His Attorvneg.
Patented Apr. 2, 1935 PATEN O'FFCE;
` ELEVATING AND TRANSFER TRUCK UNIT Herman J. H. Huber, Brookline, Pa., assign-orv to General Electric Company, a. corporation of New York Application February 1s, 193s, serial No. 657,415
My invention relates to elevating Vand transfer truck units, as for example of the character required for positioning and removing the circuit breakers and otherapparatus in a metalv clad,
oil lled bus and switch station of the type having overhead supporting structure.
In a station of the aforesaid type wherein heavy and comparatively massive circuit breakerunits are suspended in operative position from overhead supporting structure, inspection, repair or transfer of the circuit breaker necessitates the provision of means for removing and replacing said units, as by means operating beneath the supporting structure. Since the height of the overhead supporting structure is .a factor in the cost of a station, it is desirable that the aforesaid means operating beneath the structure be compact in design, of minimum height, and readily accessible for inspection and operation. I
The principal object of my invention is the provision of an improved elevating and transfer truck unit which is rugged and compact in design and which may be controlled and operated by a single attendant.
My invention will be more vfully set forth in the following description referring to the accompanying drawing, and the features of novelty which characterize my invention will be pointed out with particularity in the claims annexed yto and forming a part of this specification.
Referring to the drawing, Fig. 1 is an end elevational View of a metal clad bus and switch station having an elevating and transfer truck unit embodying the present invention, and Fig. 2 is a perspective view, partly in section, of the aforesaid truck unit.
A An elevating andtransfer truck unit I is illustrated, by way of example, as incorporated in a metall cladbus and switch station of the type wherein oil circuit breaker units 2 are suspended from overhead supporting structure 3. 'I'he overhead structure 3 having vertical supporting pillars 4 is generally fabricated of structural steel and in addition tothe heavy oil circuit breaker units 2, supports associated apparatus as the busbar structure 5 and potential transformer 6.v The metal clad bus and'switch stationrper se forms no part of the presentrinvention, the type in question being well known to those skilled in the art, and further detailed description is unnecessary other than to mention that the overhead supporting structure is generally arranged to form adjacent bays, so that there is a continuouspassageway Ybeneath the structure in which the elevating and transfer truck unit I may operateL The truck uniti comprises a supporting framev I mounted for longitudinal movement beneath the overhead structure. The frame I il is mounted on and guided by wheels II on a track I2 which extends longitudinally of the station. A carriage I3 is similarly mounted on theframe IIJ for movement transversely thereof for the purpose of placing thersame in operative position with respect tothe circuit breaker units 2 orother appartus. The carriage I3 is provided with supporting towers I4 at opposite end sthereof from which is suspended the work-receiving platform I5 which is movable vertically with respect to the carriage |3 Accordingly, it will be apparentthat thevworkreceiving platform I5 may be positionedbeneath a circuit breaker 2 for lowering andreplacing the same, by first rolling the supporting frame IB to ther approximate point in the bayL in which the circuit breaker unit is located, moving the carriage I3 transversely of the frame until the platform I5 is substantially beneath the circuit breaker unit, and nally elevating the platform until it is directly beneath the circuit Ybreaker unit so that the same may be unclamped. from the overhead supporting structure and lowered on thev platform. The circuiti4 breaker unit may be removed from the station by lowering the platform I5 and moving the carriage I3 transversely until the supporting towers I4 are approximately centrally of the bay so that there is nol interference between the supporting towers .and 'remaining circuit breaker units as the truck unit is rolled out of the station. Y u y Referring more particularly to Fig.2 which shows the elevating and transfer truck unit Vin greater detailfthesupportingframe Ill comprises a rectangular structure fabricated of structural steel having channel sections, as I-beams it', forming the transverse ends -of the frame. The supporting wheels I I are suitably mounted on 'the sides of the frameforpguiding, the unit on the track I2. The carriage I3 which-is mounted on and movable transversely fof `the frame IB includes a base structure I3 comprising channel sections, the base extendingjlongitudinally acrossv the frame I0 and provided with wheels I6 iat its opposite ends bearing on the lower flanges vof the end I-beams I0' for guiding the carriage I3 transversely of the supporting frame. Acco-rdinglyit will be noted that-the carriage I3 is mounted well Within the frame I-and but a short distance above the track I2 so that Ithere isa comparatively-- small increase in the height of the carriage I3 with respect to the kmaintrack I2 yas ywould otherselectively actuated unidirectional clutch mechanism, the supporting frame I0, carriage I3 and the work-receiving platform I5. rTo this end the motor I'I is connected by means of chain gearing I8 to a countershaft I9 onwhich is mounted clutch mechanism for'connecting the motor to the supporting frame I0, clutch mechanism 2| for connecting the motor to the carriage I3 and vclutch mechanism 22 for connecting the motor to the platform I5. The aforesaid clutch mechanisms are not illustrated in detail in the interest of clearness, it being of course understood that any suitable clutching device, as of the wellknown cone type for` example, maybe used if desired. f
The separate clutch mechanisms are each provided with actuating means indicated at 20', 2| and 22', respectively, comprising levers pivoted so as to cause engagement and.v disengagementV of the corresponding clutch upon actuation of the clutch lever. Y Y y For the purpose of centralizing the control of the clutch actuating means Vat a single point `on the truck unit, a controlpedestal 23 is mounted on the carriage I3 and is provided with aV control box 24 for operating levers 20", 2|" andv 22" suitably connected through connecting rods and cranks to the clutch? actuating means 2B', 2| and 22', respectively. Accordingly, an attendant standing on the control pedestal may control the operative connections between the motor I1 and the frame I0, carriage I3 and platformY I5.
As illustrated, the motor II'I may actuate the aforesaid movable -portionseither selectively or simultaneously. In certainvcases it may be desirable to interlock thev clutch operating handles so that but a single clutchfor example may be engaged at a time. In this case anysuitable interlocking means may be used, such interlocking of operations being well known and vdescription and illustration of the same being unnecessary for understanding thepresent invention."
Referring more particularly to the operative connections between the motor and the truck unit and movable parts thereof, the connections between the motor and the frame I|J comprises the clutch mechanism 20, the clutch-controlled idler gear 25 mounted on the shaft I9, chain drive 26 and countershaft 21 which is suitably journaled to bearings xed with respect tothe base structure |3 of the carriage I3. A pair of wheels I| of the frame il are connected to; a main drive shaft 23 as by the gearing 29, and the countershaft 2Ifis operatively connected to the'drive shaft 28 by gear couplings SI1- 3| so as to provide for actuation on the drive shaft 28 regardless of the transverse position of the carriage onA the supporting'box. In the present instance thisisfaccomplished -by a sliding, keyed connection between the shaft 28 and gear 3|. The shaftr 28 is preferably square in cross section Withinthe range of movement of the carriage` I3, the'gear 3| beingffree to slide longitudinally o-f the shaft 28 but, of course, keyed thereto with respect to rotative movement. It will, therefore, be apparent that as the carriage I3 is shifted transversely of the supporting frame, the gear 3|, which is in mesh with the coacting gear 30, is correspondingly shifted so that a driving connection between the motor and truck unitl may be effected at any time.
'The connection between the motor and the carriage I3 comprises the clutch mechanism 2|, the clutch-controlled idler gear 32 on shaft I9, coacting gear 33, countershaft 34 and the gear drive connection 35 for directly driving a pair of wheels I6 of the carriage. Transverse movement of the carriage is, therefore, readily effected by engaging the clutch mechanism 2|.
The connection between the motor and the work-receiving platform I5 comprises the clutch mechanism 22, the clutch-controlled idler gear 36 on shaft I9, coacting gear 3l and countershaft 38 at the opposite ends of which a pair of jackscrews 39 are actuated through the gearing 4|). Each jackscrew is preferably mounted and housed by a supporting tower l 4 as best illustrated by the broken-away portion of the drawing. For the purpose of connecting the platform I5 to its actuating means so as to prevent binding or jamming in the event of eccentric loading of the platform, and for allowing slight sidewise or pivotal movement of the platform for properly aligning the-circuit breaker unit when elevated into position, each jackscrew is connected` to one end ofthe platform |5 by means of a single traveling nut 4I and a pair of cables 42 operating on pulleys 43. The pulleys 43 arek suitably mounted in the upper part of the corresponding supporting :r
tower and are connected at one end to the traveling nut 4I and at the other end to an outer edge ofthe platform I5. The platform I5 is preferably notched as at I5 so that the opposite ends of the platform are loosely guided by the towers I4.
By reason of the aforesaid suspension of the platform at its opposite ends, a limited degree of sidewise or pivotal movement of the platform is permitted for final and accurate positioning of the'circuit breaker units. Furthermore, the use of a single traveling nut on an end jackscrew prevents binding or jamming at the screw threads as might be the case where a pair of jackscrews at each end of the platform are used.
The motor Il is supplied with power from a point xed with respect to the truck unit by means of a flexible power cable 44 which is led out along the outer side of the track I2, as indicated, and maintained under tensionA by a cable reel 45 mounted beneath the control pedestal 23.r The cable reel I5-feeds out the cable whenfthe truck unit is moved along the stationv and takes up the slack when the truck unit is returned. By laying the cable along the outer side of the track thc probability of damage to the cable by the truck unit itself is minimized and the cable likewise is less in the Way of attendants Working around the truck unit. The electrical connection between the cable reel and the motor may comprise a rigid conduit 46 kfor housing the power conductors in View of the fact that the motor is mounted on the carriage itself. The connection between the cable reelfand the conduit 45 is suitably made as by in accordance with operating requirements. For example, where no limit switches are considered necessary in the travel of the carriage and work-receiving platform, three push button switches for the motor are suicient; that is,
forward, reverse and stop switches. Where, however, the limit switches are desired, a separate set of push button switches, as generally indicated at 48 on the control box, are used for each operation.
It should be understood that my invention is not limited to specific details of construction and arrangement thereof herein illustrated, and that changes and modifications may occur to one skilled in the art without departing from the spirit of my invention.
What I claim as new and desire to secure by Letters Patent of the United States is,-
l. An elevating and transfer truck unit comprising a supporting frame mounted for longitudinal movement, a carriage mounted on said frame for movement transversely thereof, a work-receiving platform mounted on and movable vertically with respect to said carriage, a motor mounted on said carriage, means operatively connecting said motor to said supporting frame including a drive shaft for said frame and a driving gear slidably mounted thereon and movable with said carriage and clutch means between said motor and said frame, carriage and platform for effecting selective actuation of the same.
2. An elevating and transfer truck unit comprising a supporting frame mounted on a track for longitudinal movement, a carriage similarly mounted on said frame for movement transversely thereof, a Work-receiving platform extending across and suspended at opposite ends from said carriage and vertically movable with respect thereto, a motor carried by said unit, and selectively actuated clutch mechanism for operatively connecting said motor to either said supporting frame, carriage or platform,
3. An elevating and transfer truck unit comprising a supporting frame mounted for longitudinal movement, a carriage mounted on said frame for movement transversely thereof, a Work-receiving platform mounted on and movable vertically with respect to said carriage, a reversible motor mounted on said carriage, and uni-directional clutch means operatively connecting said motor to said supporting frame, carriage and platform for effecting selective actuation of the same.
4. An elevating and'transfer truck unit comprising a supporting frame mounted and guided on a track for longitudinal movement, said frame having transverse side members forming channel sections, a carriage having supporting wheels at opposite ends thereof guided within and atthe lower parts of said channel sections so that said carriage may move transversely of said frame, supporting structure mounted at opposite ends of said carriage, a work-receiving platform positioned between and depending from said structures, and means for selectively actuating said platform, carriage and supporting frame.
5. An elevating and transfer truck unit comprising a supporting frame mounted for longitudinal movement, a carriage mounted on said frame for movement transversely thereof, a
work-receiving platform mounted on and movable vertically with respect to said carriage, a
vertically positioned supporting tower including a jackscrew and a pair of cables operatively interconnecting said jackscrew and one end of said platform mounted at opposite ends of said carriage, each of said cables being connected at one end to the corresponding jackscrew and at its other end to the outer edge of said platform so as to provide for eccentric loading of said platform, a motor mounted on said carriage, and selective clutch mechanism for operatively connect- 'mg said motor to said jackscrews for raising or lowering said platform and to said carriage for effecting transverse movement thereof.
6. An elevating and transfer truck unit com prising a supporting frame having Wheels mounted on a track for longitudinal movement, a carriage similarly mounted on said frame for movement transversely thereof, a work-receiving platform suspended from said carriage andvertically movable with respect thereto, a motor mounted on said carriage, a control pedestal for said motor mounted on said carriage, a clutch mechanism for operatively connecting said motor to said platform, a second clutch mechanism for operatively connecting said motor to said carriage, and a third clutch mechanism operatively connecting said motor to a drive shaft for moving `said supporting frame and truck unit along said track, said drive shaft having a driving gear mounted for longitudinal movement on said shaft for coacting with a gear mounted on said carriage, said clutch mechanism being selectively controlled from said control pedestal.
HERMAN J. I-I. HUBER.