US2785324A - Electric hoist wiring and terminal means - Google Patents

Description

March 12, 1957 c. J. MANNEY ETAL 2,785,324

ELECTRIC HOIST WIRING AND TERMINAL MEANS Filed Dec. 13, 1955 4 Sheets-Sheet 1 INVENTORS CflARLA-S J. Mmw r March 12, 1957 c. J. MANNEY ET AL 2,785,324

ELECTRIC HOIST HIRING AND TERMINAL MEANS Filed Dec. 13, 1955 4 Sheets-Sheet 2 INVENTORS C/m/ue: JAM/wve'v AaRs/v W LERCH BY Hanna's-x A'PARA'ER c. J. MANNEY ETAL 2,785,324

March 12., 1957 ELECTRIC HOIST WIRING AND TERMINAL MEANS Filed Dec. 13, 1955 4 Shets-Sheet :s

INVENTORS OVA/us: J. MA zwver 1095A! W. 150a! flowrmu-v A PAR/(IR H rmmvtv:

March 12, 1957 c. J. MANNEY ETAL 2,785,324

ELECTRIC HOIST WIRING AND TERMINAL MEANS 4 Sheets-Sheet Filed Dec. 13 1955 ML R QNN IN V EN TORS ELECTRIC HOIST WIRING AND TERIVHN AL MEANS Application December 13, 1955, Serial No. 552,938

Claims. (Cl. 310-68) This invention relates to electric hoists, and more particularly to the construction and arrangement of the control circuits and wiring thereof.

One of the objects of the present invention is to provide in an electric hoist mechanism an improved control circuit arrangement including novel motor terminal board components.

Another object of the invention is to provide in a mechanism as aforesaid a novel terminal board construction including connectors for alternative use so as to render the hoist readily convertible for example from 220 volt to 440 volt operation.

Other and more specific objects and advantages of the invention will appear from the specification hereinafter.

In the drawing:

Fig. l is a fragmentary side elevational View of an electric hoist and control device therefor, such as may conveniently embody the present invention;

Fig. 2 is a fragmentary sectional view on enlarged scale through the hoist, along line ll-II of Fig. 1, shot ing the conversion terminal board component of the invention in elevation;

Fig. 3 is a sectional view taken along line III-III of Fig. 2;

Fig. 4 is a sectional view taken along line IV-IV of Fig. 2;

Fig. 5 is a rear elevational view of the conversion terminal board of Fig. 2;

Fig. 6 is a fragmentary sectional view, on an enlarged scale, taken along line VI-VI of Fig. l, and showing the motor terminal board component of the invention;

Fig. 7 is a disassembled view, on an enlarged scale, of one of the pair of wiring harnesses or bundles electrically interconnecting the motor and control co1n ponents housed in opposite ends of the hoist structure; the second harness being of similar construction.

Fig. 8 is a wiring diagram of a control circuit such as might typically be employed in the hoist mechanism; and

Fig. 9 is a diagram of alternative 440 volt-220 volt elementary wiring arrangements such as are available with maximum facility when employing the construction of the invention.

As shown in the drawings herewith, the invention is incorporated in an electric hoist mechanism including generally a housing 10, carried by a suspension hook 12 and from which depends a load lift chain 14 terminating in a load lift hook 15 (Fig. 1). The hoist operation push-button control box 16 also suspends from the hoist frame by means of the interconnecting control cable as indicated at 18. The power supply cable is indicated at 19 (Figs. 1, 2, 6).

As illustrated diagrammatically in Fig. 8, the major components of the control circuit and wiring system of the hoist of the invention may include the motor as indicated generally at 20; a voltage transformer as indicated at 22; a motor terminal boa-rd as indicated at 24; a pair of wiring harnesses as indicated at 25-25a; a conversion States Patent 0 terminal board as indicated at 26; an electric brake operated solenoid as indicated at 28; and a magnetic contactor (or relay mechanism) as indicated at 30 which controls the starting and reversing of the hoist motor in response to signals received from the push-button control station 16. Also, travel limit control switches as indicated at 32-34 may be provided to automatically stop operation of the hoist upon attainment of predetermined limits of travel in up and down directions, as is customary in the art.

Thus, as shown in Fig. 6 of the drawing, adjacent the position of the motor mounting in the hoist frame, a motor terminal board of molded plastic form is nested within and bolted to the hoist frame by means of machine screws as indicated at 37. For example, if the hoist motor is of the three-phase type designed to operate on either 220 volt or 440 volt power, the Y connected stator leads are coupled to the rear ends of the terminals 38 of the motor terminal board 24, as well as the leads from. the transformer 22. The connectors 40 of the wiring harnesses 25-25:: are then slip-fitted into connection with the front ends of the appropriate terminals of the motor terminal board 24 and lead therefrom to the opposite end of the hoist mechanism, hereinafter referred to as the control end of the unit. As explained hereinabove, some of the harness leads connect at 42 to the solenoid control circuit of the electro magnetic brake. Others lead to connections at 44 to the motor control relay mechanism designated generally at 34) for energizetion and response to signals furnished from the pushbutton control station 16. The remaining three terminals 45 of the conductors of the harness bundle 25 connect into terminals 46 of the conversion terminal board which is designated generally at 26.

The conversion terminal board 26 is formed of a molded plastic material in the form illustrated herein so as to be adapted to nest and to be mounted within the contours of the hoist housing 10, as by means of ma.- chine screws 56 (Fig. 2). As illustrated in Figs. 2, 3, the front surface of the board 26 is provided with two vertical rows of eight outstanding contact fingers 69-61 for alternative slip-fitting connection with complementary grip portions 63 of siX of the seven conductors of the harness bundle 25a. Connectors 64-64 (Fig. 8) lead to the brake solenoid 28, and the remaining conductor of the bundle 25:: leads to relay connection at 65'. The contact terminals 60-61 are arranged in respective vertical rows on the block 26 and are so connected as shown on the wiring diagram Fig. 8 that in order to convert the unit from 220 volt to 440 volt operation, it is only necessary to move the eight connectors 63-64 from the left hand row of 220 volt terminals 61 to the right hand row of 440 volt terminals 60. incidental to doing this the motor and the primary of the transformer have both been reconnected. However, the push-button circuit remains connected to the volt secondary circuit of the transformer. Fig. 9 illustrates schematically the typical 440 volt-220 volt circuits which are alternatively completed upon transfer of the connectors 63-64 to alternate rows of terminals 69-61.

By reference to Fig. 8 ol the drawing, it will be appreciated that with the power cable 19 connected to the power supply source, the primary circuit of the transformer 22 is energized. Depression of the up or down push-button at control box 16, thereupon completes the secondary or pilot circuit, thereby energizing the hoist or lower operating coil at the magnetic contactor unit 30. When the appropriate contacts of the contactor close, circuits to the electric brake operating coil and to the windings of the motor stator are completed, and the motor will commence to operate so as to raise or lower the hook until the push-button is released, or until a limit switch breaks the control circuit. If and when the push-button is released, the circuit to the operating coil of the contact is broken,,thereby permitting the main contacts of the contactor unit toopen, thereby breaking the circuits to thernotor and to the-electricbrake solenoid coil. The compression spring .of the brake unit thereupon operates to set the brake against the drive shaft rotation, thereby stopping the motor rotation.

Thus, it will be appreciated that by virtue of the constructional and wiring arrangements of the invention as illustratedand describedhereinabove, the hoist mechanism is readily convertible between 220-440 volt operation by the simple act of shifting the slip-fitted connectors 63-64- betwcen alternative rows of terminals 69, d1. Thus, the motor stator field coils receive either .220 or 440 volt current. The transformer primary is similarly energized while the secondary thereof continues to deliver '115 volt current to the push-button control station which in turn energizes the relay control mechanism. Also, under 440 volt conversion conditions, the circuit connections described hereinabove cause the magnetic brake supply leads to be reconnected in the motor field circuit in such manner as to draw only 220 volts from the power line. Hence, the push-button control and the contactor relay and the magnetic brake mechanisms may be of standardsingle winding constructions, components, and only the motor needs to be of a dual voltage type.

What is claimed is:

In an electric hoist, in combination, a housing, an electric motor mounted interiorly of one .end of said housing and a motor power supply control .circuit construction comprising a motor terminal board of molded plastic insulative material mounted interiorly. of said frame adjacent the position of said motor, conductors from the motor stator connected to terminals at the rear face ,of said panel, a voltage transformer disposed within said housing adjacent the position of said motor and having conductors extending therefrom into connection with terminals at the rear face of said panel, a bundle of conductors having slip-fitted connection devices at their opposite ends and electrically connected to the terminals of said motor terminal panel at the front side thereof; a voltage conversion terminal board of molded plastic form mounted interiorly of said housing at the other end thereof and having two alternative rows of terminals extending therethrough from front to rear faces thereof; the free ends of said bundle of conductors being disposed to reach into alternative connections with either of said rows of terminals at the front face of said conversion terminal board, and conductors coupled to the rear ends of said conversion terminal board terminals and extending to electrical connections with the operation control components of the hoist.

2. In an electric hoist, in combination, a housing, an electric motor mounted interiorly of one end of said housing, a motor control system comprising a motor circuit terminal board mounted interiorly of said frame adjacent the position of said motor, conductors from the motor stator connected to terminals at the rear face of said panel, a voltage transformer disposed Within said housing adjacent the position of said motor and having conductors extending therefrom into connection also with terminals at the rear face of said panel, a bundle of conductors having slip-fitting connection devices electrically connected to the terminals of said motor terminal panel at the front side thereof; a voltage conversion terminal board mounted interiorly of said housing at the other end thereof and having two alternative rows of terminals extending therethrough from front to rear faces thereof; said conductors being disposed to reach into alternative 4 connections with either of said rows of terminals at the front face of said conversion terminal board, and conductors coupled to the rear ends of said conversion board terminals and extending to electrical connections with the operation control components of the hoist.

3. in an electric hoist, in combination, a housing, an electric motor mount-ed interiorly of one end of said housing and a motor control system comprising a motor circuit terminal board mounted interiorly of said frame adjacent the position of said motor, conductors from the motor stator connected to terminals at the rear face of said panel, conductors having slip-fit connection devices at their opposite ends electrically connected at one end to the terminals of said motor terminal board at'the front side thereof; and a voltage conversion terminal board mounted interiorly of said housing at the other end thereof and having two alternative rows of terminals extending therethrough from front to rear faces thereof; the other ends of said conductors being disposed to reach into alternative slip-fit connections with either of said rows of terminals at the front face of said conversion terminal board.

'4. Inan electric hoist, in combination, a housing, an electric motor mounted interiorly of one end of said housing and a motor power supply control circuit including a motor terminal board mounted interiorly of said frame adjacent the position of said motor, conductors from the motor connected to terminals at the rear face of said panel, a bundle of conductors having slip-fitted connection devices electrically connected to the terminals of said motor terminal panel at the front side thereof; a voltage conversion terminal board mounted interiorly of said housing at the other end thereof and having alternative terminals extending therethrough from front to rear faces thereof; the free ends of saidbundle of conductors being disposed to reach into alternative connections with selected of said terminals at the front face of said conversion terminal board to convert the hoist from one voltage operation to another, and conductors coupled to the rear ends of said conversion terminal board terminals and extending to electrical connections with the operation control components .of the hoist.

5. In an electric hoist, in combination, 'a housing, an electric motor mounted interiorly of one end of said housing and a motor power supply control circuit construction comprising a motor terminal board of molded plastic insulative material mounted interiorly of said frame adjacent the position of said motor, conductors from the motor stator connected to terminals at the rear face of said panel, a voltagetransforrner disposed within said housing adjacent the position of said motor and having conductors extending therefrom into connection with terminals at the rear face of said panel, a bundle of conductors having slip-fitted connection devices at their opposite ends and electrically connected to the terminals of said motor terminal panel at the front side thereof; a voltage conversion terminal board of molded plastic form mounted interior'ly of said housing at the other end thereof and having alternative terminals extending therethrough from front to rear faces thereof; the free ends of said bundle of conductors being disposed to reach into alternative connections with selected of said terminals at the front face of said conversion terminal board to convert the hoist from one voltage operation to another, and conductors coupled to the rear ends of said conversion terminal board terminals and extending to electrical connections with the operation control components of thehoist.

No references cited.

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