Emhart Industries, Inc.

Emerson Electric Company

George W Adams

Steven W Smock

Elmo W Voland

Jimmy L Sheeks

Ross G Helft

C Bruce Banter

A timing mechanism has cams operating switches which control the functions of an appliance and another cam operating another switch supplying short pulses to a separate function such as a warning buzzer. A PTC thermistor is in series with the switch supplying the short pulses which when applied to the buzzer electrical circuit provides a short controlled 'on' time to the buzzer even though power is applied to the complete switching system for an extended period of time by the timing mechanism.

Timing mechanism with a PTC thermistor

A timing mechanism has cams operating switches which control the functions of an appliance and another cam operating another switch supplying short pulses to a separate function such as a warning buzzer. A PTC thermistor is in series with the switch supplying the short pulses.

An appliance timer includes a motor driven cam carried in a housing. A switch blade carried in the housing is responsive to the cam to selectively activate one of a pair of switch circuits, each of which provide a different operating level for an appliance function, e.g. several different heat levels in an automatic dryer. Each switch circuit includes a contact, a contact support spring, and an electrical feed-through which connects to a terminal strap on the exterior of the housing. A resistor that is an integral part of one of the switch circuits provides the level differentiation between the circuits. In one embodiment a carbonaceous organic resistor chip replaces the circuit contact. In another embodiment an inorganic ceramic resistor slug replaces the circuit feed-through.

Appliance timer

A control system provides slow and fast defrost cycles for a heat pump by providing an auxiliary manual switch to select different cams of a timing means for cycle operation. Selective ones of the cam switches are connected in parallel to permit two different defrost time cycles utilizing four cams rotating at the same speed.

Control system for a heat pump system

A timer assembly is trapped against a motor and gear box assembly by a bracket. The bracket is U-shaped to cradle the timer assembly in the bracket. It includes ears with apertures therein that mate with apertures in ears extending from the motor assembly. Rivets extend through the apertures to connect the ears together.

Mounting means for timer-motor assembly

A timing mechanism is started by pushing a plunger against a cam assembly to disengage a cam from a switch to allow the switch to close. The cam assembly is axially spring biased against a wall of the timing mechanism to stop its movement after the switch closes. The plunger is axially spring biased against the cam assembly to permit it to proceed and override the cam assembly to prevent jamming of the plunger or other elements of the timing mechanism until a stop prevents continued movement of the plunger.

Push to start timing mechanism

The electrical connections illustrated in U.S. Pat. No. 3,727,015 have been improved by providing a means of holding the combination electrical terminals and electrical blades in a housing wall to provide more positive electrical connections and by providing a means to connect electrical leads to the combination within the wall.

Cam operated timer with improved electrical connections

Upon insertion of a coin into a receiver of a timing mechanism, an actuator rotates a ratchet which in turn rotates a cam. The cam and a disc each have a tab extending therefrom. When the ratchet and cam are rotated, the tabs separate from each other providing a desired timing cycle and the cam is set to close electrical switches. When the timer is operative, the disc rotates causing its tab to engage the tab of the cam to rotate the cam and open the electrical switches.

Coin operated timing mechanism

A circuit controller which in addition to providing a program for actuating functions of a clothes dryer also includes a means to provide an additional program to prevent wrinkling of the clothes after the normal drying program is completed. The additional program is provided in a gear train of a motor and follower means are provided to be actuated by the additional program to open and close electrical switches.

Growing community of inventors

Greenwood, IN, United States of America

George W Adams