Calvin J Holtkamp

US Patent:

39328309, Jan 13, 1976

Filed:

Jan 23, 1975

Appl. No.:

5/543375

Inventors:

Calvin J. Holtkamp - Mansfield OH

Assignee:

White-Westinghouse Corporation - Cleveland OH

International Classification:

H01H 7116

US Classification:

337 64

Abstract:

A thermal cycling switch such as is used to control surface units on domestic cooking ranges is provided with a compression spring arrangement urging the cam controlling the switch in one direction and a shaft axially movable relative to the cam in an opposite direction, and detent means are provided to prevent the shaft and cam from being rotated until the shaft is first shifted axially relative to the cam.

US Patent:

50252429, Jun 18, 1991

Filed:

Jul 24, 1990

Appl. No.:

7/558324

Inventors:

Calvin J. Holtkamp - Mansfield OH
George L. Hetrick - Mansfield OH
Richard Warren - Mansfield OH

Assignee:

Robertshaw Controls Company, Inc. - Richmond VA

International Classification:

H01H 3736
H01H 3712

US Classification:

337309

Abstract:

An oven control for self-cleaning ovens provides a hydraulic sensing system having a wafer-like bellows. The position of the bellows is adjusted by a face cam on a control shaft in the BAKE and BROIL modes of operation. The bellows also controls the temperature of the oven for SELF-CLEANING. However, the face cam does not determine the SELF-CLEANING temperature. A door lock operator switch is also operated by the bellows, but is connected so that the adjusted position of the bellows does not affect the door lock operating temperature. Three separate calibration adjustments are provided. The first calibrates the operating temperature in the BAKE and BROIL modes of operation. The second calibrates the SELF-CLEANING temperature, and the third calibrates the door lock operating temperature. A bimetal ambient temperature compensator is provided to compensate for variations in the ambient temperature of the control.

US Patent:

42142245, Jul 22, 1980

Filed:

Sep 25, 1978

Appl. No.:

5/945399

Inventors:

Calvin J. Holtkamp - Mansfield OH

Assignee:

White Consolidated Industries, Inc. - Cleveland OH

International Classification:

H01H 3736

US Classification:

337323

Abstract:

A multi-function, pyrolytic self-cleaning oven thermostat for regulating bake and clean temperatures and oven door unlatching. The thermostat includes separate bistable and creep-action switch mechanisms actuated by a single thermally expansive hydraulic wafer responsive to oven temperature changes. An axially movable partially threaded shaft, rotatable between two end positions, is provided for operator adjustment of the temperature switching point of the bistable mechanism. At one end position of the rotative shaft a minimum baking temperature switching point is provided while at the other end position a maximum temperature switching point is established for pyrolytic self-cleaning of the oven. A generally linearly increasing temperature range of bistable mechanism switching points is provided from the minimum to the maximum temperature switching point end positions. A portion of the temperature range not suitable for baking or pyrolytic cleaning and corresponding to a sector of shaft rotation between the two end positions may be utilized as an off position separating a larger sector of baking temperature shaft positions and a smaller self-cleaning shaft position sector.

US Patent:

44713380, Sep 11, 1984

Filed:

Jun 2, 1982

Appl. No.:

6/384434

Inventors:

Calvin J. Holtkamp - Mansfield OH

Assignee:

White Consolidated Industries, Inc. - Cleveland OH

International Classification:

H01H 7116

US Classification:

337 64

Abstract:

A push-to-turn thermal cycling switch for regulating the wattage of a resistance type surface heating unit of a domestic cooking range of the electric type is disclosed. The duty cycle of the heating unit, and thus its heat output is regulated by the switch cycling on and off in accordance with movement of a switch-contained bimetallic element heated by current flowing to the heating unit via the switch. The switch cycling is determined by the position of a disc cam member carried on an axially shiftable, user-rotatable shaft having a detent means for rotatably locking the shaft at an "off" position. The shaft is formed in a single step die-casting operation. A latch secured disc cam retainer facilitates machine assembly of the switch components.