US1595853A - Switch handle - Google Patents

Description

Aug. 10 1926.

C. E. CANFIELD SWITCH HANDLE Fil ed .Nov. 21, 1921 //ll f Mi Ev Inventor. Ch arvles ECanfield,

HIS Aitorn ey.

Patented Aug'.- 10, 192 6.

:UNITED STATES PATENT orries.

CHARLES E. CANFIELD, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR: TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK. 4

SWITCH HANDLE.

My invention relates to tap changing switches for encased electrical apparatus such as transformers. It is frequently desirable to provide such apparatus with a switch located with the apparatus inside a casing or container and electrically connect ed with a series of taps brought out from the windings of the apparatus so that it may vary the number of effective turns of such windings. When used in connection with the primary windings of. a transformer, such a switch may be usedto vary the voltage ratio of the transformer by varying the number of effective turns in the primary winding and therefore the ratio between the primary and secondary turns.

It is more particularly the principal object of the present invention to provide an improved handle for a ratio adjusting switch such that the handle may be located outside the casing or container 1n some convenient and accessible location, preferably by mounting it directly on the outer surface of the container; Apparatus oi the class re-, ferred to is frequently immersed in an insulating and cooling fluid such as oil, the oil completely filling the container. A socalled conservator or reservoir located above the top out the fluid in the casing is often connected with the space within the corn tainer and filled at least partially with the tluid so as to maintain the container full of the fluid at all times. It will be seen that with this arrangement, the fluid within the container is always under some pressure,

and it a further object of the invention to provide a ratio adjusting switch handle so constructed that no cooling liquid may leak past its joints from within the con.

tainer. 1

One embodiment of my invention is illustrated in the accompanying drawing in which Fig. 1 is a plan view of a .ratio adjusting switchhandle constructed in accordance therewith; Fig. 2 is an elevation,-partly in section on the line 2 of Fig. 1; and Fig. 3 is an elevation of a container, with the handle mounted thereon, for induction ap aratus,- such as a transformer.

n this embodiment of the invention, the induction apparatus and switch are surrounded by a casin or container 1 provided with a coverv 2. 'l is cover 2 forms a base torthe switch handle and has an opening 3 surrounding which on the upper lace of the cover is a seat for a gasket 4. Over the opening 3 is an annular member 5 secured against the gasket 4 by screws 6. These screws 6 are s aced at difierent angular dis tances about t e periphery of the member 5 so that this member can be secured tothe cover 2 in only one position. A shaft 7 ex tends through the central opening of the annular member 5 and is surrounded by packing material 8, such as asbestos, which is compressed and held in place by a follower 9 under a nut 10 screw-threaded into the upper end of the central opening in the annular member 5. An imperforate cap 11 covers the top of the shaft 7 and the nut 10 and is held against the annular member 5 by screws 12, a gasket bein provided between the opposing faces 0 this cap and the annular member 5. A headedpin 13 passes throu h a hole in the upper end of the shaft 7, the hole in the shaft being small at one end to lit the shank of the pin and larger at the other end to fit the head ot the pin so that the pin can be inserted in the shaft only in one direction. The inner closely both ends of the pin 13 which protrudefrom the shaft as shown clearly in Fig. l. struction that the pin 13 constitutes means which ensures that the cap and shaft shall always maintain the same relative angular positions and that they cannot be otherwise assembled. The lower end of the shaft is connected to a rod 14 by a stud 15 anda sleeve 16, these members being pinned together asshown in Fig. 2 and one or more of the joints being loosely pinned to allow a desirable amount of play between the shaft and rod. The rod 14 extends to the ratio adjusting switch and is adapted to op-' crate or adjust this switch as it is turned.

The switch and the lower end of the rod are pointer 18 earned by. the cap 11 and movable over a series of figures or indicating lt will beunderstood from this conmarks on the member 5, each of these marks indicating the position of the pointer for a corresponding switch adjustment. When a change in switch adjustment is desired, the two screws 12 are removed to release the cap 11 and the cap rotated until the pointer 18 indicates the desired adjustment. The two screws 12 are then replaced and tightened, additional threaded holes 19 in the member 5 being provided for the screws 12 so that thetap 11 may hold the switch in any desired operative adjustment as indicated by the pointer 18. The gaskets between the cover 2 and member 5 and between the member 5 and the cap 11 form seals which prevent any leakage of oil or other cooling fluid from within the handle and which might leak along the shaft 7. The packing 8 around this shaft will of course prevent any appreciable leakage duringsuch times as the cap may be loosened for the purpose of adjusting the switch. Stops 20 and 21 formed on the periphery of the cap 11 cooperate with a post or stop 22 on the member 5 to limit rotation of the cap. in either direction aeaeae beyond the limits of movement of the switch.

What I claim as new and desire to secure by Letters Patent of, the United States, is

A switch handle including a base having an opening, an annular member, means for securing said annular member in one angular posltion only over said opening, aswitch operating shaft extending through said opening and said annular member, a stuffing box carried by said annular member to pro vide a seal about said shaft, an imperforate cap over the end of said shaft, means for securing said cap about the end of said shaft in one angular position only relative thereto,

seals between said cap and annular member and between said annular member and base, means for securing said cap to said annularmember in ditl'erent angular positions corresponding to different operative positions of the switch controlled by said shaft, and

indicating means on said cap and annular member for indicating switch positions.

In witness whereof, I have hereunto set my hand this 5th day of Now, 1921.

CHARLES E. CANFIELD.

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