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Details

Inventors: Dana, Merrill A.;
Assignee: Hudson Lock, Inc. (Hudson, MA)
Primary Examiner: Marcus; Stephen
Assistant Examiner: Sholl; Linda J.
Attorney, Agent or Firm: Toupal; John E., Jarcho; Harold G.

A key controlled switching apparatus including a body for mounting in an enclosure, the body comprising a front body portion defining a front cylindrical shell and a rear housing secured thereto. A cylindrical locking plug defines a front keyway and is mounted for rotation between locked and open positions within the shell and a plurality of locking tumblers are retained by the plug and extend into the front keyway. Aligned with the locking plug and rotatable therewith is a switching plug extending into the rear housing and defining a rear keyway axially aligned with the front keyway. A plurality of stationary electrical contacts are retained by the rear housing and a plurality of movable electrical contacts are retained by the rear housing and each movable contact is engageable with a different one of the stationary electrical contacts. Extending into the switching plug are a plurality of actuators, each movable into an active position that moves a different one of the movable contacts into engagement with one of the stationary contacts. A key is insertable into the front and rear keyways and includes a front portion bitted to engage and produce movement of the tumblers and a rear portion having bitted portions shaped and arranged to engage and move predetermined ones of the actuators into their active positions. The switching plug accurately aligns the rear key portion and the actuators and guides movement thereof into their active positions.

DETAILED DESCRIPTION What is claimed is: 1.
A key controlled switching apparatus comprising: a body means for mounting in an enclosure, said body means comprising a front body portion means and a rear housing means secured thereto, and said front body portion means defining a front cylindrical shell; a cylindrical locking plug mounted for rotation between locked and open positions within said shell and defining a front keyway; a plurality of locking tumblers retained by said plug and extending into said front keyway; a switching plug axially aligned with said locking plug and rotatable therewith, said switching plug extending into said rear housing means, and defining a rear keyway axially aligned with said front keyway; a plurality of stationary electrical contacts retained by said rear housing means; a plurality of movable electrical contacts retained by said rear housing means and each engageable with a different one of said stationary electrical contacts; a plurality of actuators retained by said rear housing means and extending into said switching plug and each movable into an active position that moves a different one of said movable contacts into engagement with one of said stationary contacts, said switching plug being rotatable with respect to said actuators; and a key insertable into said front and rear keyways, said key comprising a front portion bitted to engage and produce movement of said tumblers, and a rear portion having bitted portions shaped and arranged to engage and move predetermined ones of said actuators into said active positions.
2.
An apparatus according to claim 1 wherein said locking and switching plugs are discrete components demountably engaged for common rotation.
3.
An apparatus according to claim 1 wherein said rear housing means defines a rear shell portion retaining said switching plug.
4.
An apparatus according to claim 3 wherein said switching plug defines a plurality of axially spaced apart, radial slots intersecting said rear keyway and each retaining one of said actuators; said slots shaped and arranged to accommodate said actuators during rotational movement of said switching plug

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