US730667A - Controller for electric motors. - Google Patents

Description

PATENTBD JUNE 9, 1903.

J. B. LINN.

GONTROLLER FOR ELECTRIC MOTORS.

APPLICATION FILED 1330.28, 1900.

N0 MODEL.

VWtnesses: Inventor.

John BLlnn.

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UNITED STATES Patented June 9, 1903.

PATENT OFFICE.

JOHN B. LINN, OF SCHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

CONTROLLER FOR ELECTRIC MOTORS.

SPECIFICATION forming part of Letters Patent 0. 730,667, dated June 9. 1903.

To all whom, it may concern;

Be it known that I, JOHN B. LINN, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York,

have invented certain new and useful Im-.

set forth and are now so universally recog-- nized that theyneed not be repeated here;

but in electric cranes and similar machinery it is desirable to be able to run the motor in either-direction by simply swinging a single controller-handle one way or the other from a central 0E position. This enablesthe engineer to control his motor with one hand, leaving the other hand free to manage whatever other apparatus he may have charge of.

A controller with a cylinder large enough to accommodate a double set of contacts, one for forward and one for backward motion,

would be exceedingly bulky, and therefore in many cases impracticable.

The object of my invention is to enable the compact standard controller to be used, with its small cylinder carrying one set of contacts and its reversing-switch enabling said contacts to be employed for forward and backward motion. 7

To this end the invention consists in an attachment fitting on top of a standard controller and comprising connected mechanism to engage with the shafts of the contact-cylinder and reversing-switch, and thereby enable both to be actuated by one handle.

In the drawings, Figure 1 is a sectional plan View of lily-invention with the casing in section. Fig. 2 is a sectional elevation on the line 2 2, Fig. 1. Fig. 3 is a cross-sectional view on the line 3 3, Fig. 1. Fig. 4 is a detailplan view of the reversing-switch lock.

The upper portion of a standard controller A is shown in Figs. 2 and 3, the main contactcylinder being indicated (in Fig. 2 only) atB and the reversing-switch at C, the shaft of each being provided with the usual squared end Z) c.

A casing D, somewhat wider and longer than the controller-casing, fits on top of the latter, being secured thereto by bolts E passing through registering lugs a d. Inside of the casing D are supported two sockets F G, rotatable in suitable bearings and adapted to fitdown over and engage with the ends I) c of the controller shafts. These rotatable sockets are conveniently mounted in a bracket D, secured to the back of the casing D.

The socket F for the main contact-cylinder of the controller has-a gear-whee f secured to it, meshing with a sector-gear H, rot-atably journaled in bearing d near one end of the casing D. Pivoted to the sector-gear is a link I, the other end of which is pivotally attached at the point It to a disk K, secured to a shaft K, which extends up through a bearing 61 formed in the top of the casing D and carries a handle L, by which the disk can be turned. A spring latch Z, operated by a thumb-piece l and engaging with a notched quadrant d serves to retain the handle in any desired position. The shaft is supported .in the bearing d by a collar which may have a petticoat-flange k to protectthe bearing from moisture or dirt.

The link- I is pivoted to the disk K at such a point 70 that when the controller is in the off position the pivot stands on the deadcenterthat is, with its longitudinal axis in line with the axis of the disk-and one end of the sector-gear H is in mesh with the gearwheelfi Hence a-movement of the handle L in either direction will exert a pull on the link and cause the sector-gear to rotate the gear-wheel and the cylinder of the controller.

In order to shift the reversing-switch from the forward to-the backward position, or vice versa,as thehandle L passes the central position, I provide the socket G with a toothed flange g, whichcan be engaged by one or ICC) more teeth k on the disk K at the proper instant to turn the socket G. A locking device is also provided to prevent the reversingswitch from moving while the handle L is being carried over either half of its path. I prefer to use for this purpose a flange on the socket having two faces g 9 each curved to fit accurately the edge of the disk K, so that the flange is locked in position while either face is in engagement with the disk. At a point in radial line with the tooth 7& a notch It is-formed in the edge of the disk to permit the point of the flange between the two faces 9 g to enter it and swing past when the switch is reversed. The reversing takes place when the pivot 70 is on the dead-center, as shown in Fig. 1.

What I claim as new, and desire to secure by Letters Patent of the United States, is 1. An attachment for a controller, com prising a detachable connected mechanism to engage with the contact-cylinder and the reversingswitch and enable both to be controlled by'one handle, said connecting mechanism being readily removable as a whole from engagement with said contact-cylinder and reversing-switch.

2. An attachment for a controller, comprising a casing containing connected mechanism whereby the contact-cylinder and reversingswitch can be controlled by one handle, said casing fitting on. top of the controller-casing.

3. An attachment fora controller, comprising a casing adapted to fit on the upper end of the controller-casing and containing rotatable sockets to engage with the shafts of the contact-cylinder and the reversing-switch, and mechanism for operating said sockets by one handle.

4. An attachment for a controller, comprising a casing adapted to fit on the upper end of the controller-casing, sockets mounted rotatably in said casing to engage with the shafts of the contact-cylinder and the reversing-switch, a rotatable shaft, and connecting means between said shaft and the two sockets for rotating one of them in the same direction when the disk moves either way from a given position, and rotating the other socket in one,direction or the other and looking it.

5. An attachment for a controller, comprising a casing adapted to fit on top of the controller casing, and containing hearings, a shaft journaled in a bearing and extending up through the top of the attachment-casing, a disk on the lower end of the shaft, two sockets journaled in bearings, a gear-wheel on one of said sockets, a segment-gear meshing with the gear-wheel, a link connecting the segment-gear with the disk, and interoperating teeth on the disk and the other socket.

6. An attachment for a controller, comprising a casing adapted to fit on top of the controller-casing, a shaft extending up through the top of the attachment-casing, a disk on the lower end of the shaft having a smooth edge, two-sockets rotatably mounted in the casing, gearing connecting one of said sockets with the disk, interoperating teeth on the other socket and the disk, and a flange on the socket having two faces each curved to fit the edge of the disk, said disk having also a notch to permit the point between the curved faces to swing past when the teeth operate to rotate the socket.

In witness whereof I have hereunto set my hand this 26th day of December, 1900.

JOHN B. LINN.

Witnesses:

FRED Ross, BENJAMIN B. HULL.

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