US763861A - Electric regulating-switch. - Google Patents

Description

No. 763,861. PATBNTED JUNB 28, 1904. H. W. W. DIX & J. SANDFORD. ELECTRIC REGULATING SWITCH.

APPLICATION FILED DEC. 21, 1903.

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ELECTRIC REGULATING SWITCH.

APPLIOATIOH FILED D30. 21, 1903.

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ELECTRIC REGULATING SWITCH.

APPLICATION FILED DEC. 21, 1903.

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UNITED STATE Patented June 28, 1904.

PATENT OEEIcE.

HENRY WILLIAM WARTNABY DIX AND JOHN SANDFORD, OF BIRMING- HAM, ENGLAND.

ELECTRIC REGULATlNG-SWITCH.

SPECIFICATION forming part of Letters Patent No. 763,861, dated June 28, 1904.

Application filed December 21, 1908. Serial No. 186,102. (No model.)

To all whom, it may concern:

Be it known that we, HENRY WILLIAM WARTNABY DIX, electrical engineer, and JOHN SANDFORD, mechanical engineer, residing at 41 Church street, Birmingham, in the county of Warwick, England, have invented a certain new and useful Improved Electric Regulating-Switch, of which the following is a specification.

The object of our invention is to construct a switch in which a slow traverse of the moving contact is obtained, so that resistances are not thrown in or out of high values suddenly.

nor circuits connected or broken without proper and safe control, which may happen any time with a switch whose moving contact is capable of sudden unlimited movement.

In order to facilitate the conception of our invention and enable the same to be carried more easily into practice, we have appended hereunto three sheets of drawings.

Figure 1 is a semidiagrammatic and illustrative plan of our switch applied as an ordinary starter or regulating switch. Fig. 2 is an end view of the same. Fig. 3 is a similar view to Fig. 1, illustrating our switch in conjunction with a magnetic cut-out and circuitbreaker applied to the circuit of a shunt-motor. Fig. 4 is an end View of the same. Fig. 5 is a purely diagrammatical illustration of the application of our switch to the control of two circuits, so as to arrange them in parallel, the moving contact thread being divided and opened out flat. Fig. 5 is the same diagram showing how by the movement of the contactthread the same circuits may be connected in series.

When making our switch in its simplest tion as regards resistance-namely, with contacts 1 2and it will require half a revolution of the handle H to bring it into contact with 2 3, thus cutting out one resistance-coil, and so on until it is in the all-out position near the handle. The cutting in will of course be effected by rotating the handle in the opposite direction, and it will be understood that the contacts 1 to 10 might connect to circuits instead of resistances or cells for resistance instead of coils. It will be clearly seen by reference to Fig. 4 how the tension of the fixed contacts is adjustable, so as to insure a proper bearing, and an abrasive block may be let into the thread periphery, slightly projecting, so as to keep the fixed contacts clean.

In Fig. 3 our improved switch is shown in combination with a cut-out and contactbreaker, which can be made of any usual design, and it will be readily seen that if our moving contact-maker A is wound onto 1 2 and suiiiciently farther for the lug 0/ to put the circuit-breakerF in, as shown, the resistance is all in the motor Ms circuit, and it will be readily understood how the resistance may be gradually cut out, as before, by rotating the handle H.

The motor M may be cut out by putting over the cut-out G, which short-circuits the magnet K and allows the spring s to pull the switch-arm F over, thus breaking the circuit, and so prevents the motor being put in again by opening the cut-out G. Thus the motor cannot be cut in again without the full resistance in circuit to commence with, so that the moving contact A must be rotated to the opposite end onto 1 and until the arm F is put in, when G must be open.

Figs. 5 and 5 illustrate the adaptation of our switch to control and regulate various circuits and shows how by dividing the thread A up and insulating each portion by its movement circuits may be connected in parallel or series, or vice versa.

hat we claim, then, is

1. A circuit-controlling device comprising a plurality of stationary contacts, and a helical contact with means for rotating it and moving it axially, substantially as described.

2. A circuit-controlling device comprising names to this specification in the presence of a plurality of stationary contacts, a rotatable shaft arranged parallel thereto, a helical movable contact slidably but non-rotatably held on said shaft, and a stationary rack engaged by said helical contact, substantially as described.

In testimony whereof We have signed our two subscribing Witnesses.

HENRY WILLIAM WARTNABY DIX. JOHN SANDFORD.

Witnesses:

H. BARKERTAKE, SYDNEY A. LAKE.

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