Invention Grant
- Patent Title: Washing machine wiring to reduce mechanical timer contact welding
- Patent Title (中): 洗衣机布线减少机械定时器接触焊接
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Application No.: US12348647Application Date: 2009-01-05
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Publication No.: US08022657B2Publication Date: 2011-09-20
- Inventor: James E. Pearson , Richard Louis Elkin
- Applicant: James E. Pearson , Richard Louis Elkin
- Applicant Address: US IL Carol Stream
- Assignee: Robertshaw Controls Company
- Current Assignee: Robertshaw Controls Company
- Current Assignee Address: US IL Carol Stream
- Agency: Reinhart Boerner Van Deuren P.C.
- Main IPC: H02P1/42
- IPC: H02P1/42

Abstract:
A control circuit for a washing machine that avoids contact bounce short circuit failures is provided. A washing machine that utilizes an induction motor including a starting winding used to start rotation of the motor at the beginning of a cycle. Such washing machines require that the motor be operated in both directions during different cycles. To enable such operation, a mechanical timer uses a pair of single pole, double throw switches in a switching assembly to reverse the L1 and neutral connections to the starter winding. To avoid the contact shorting problem, the control wiring runs either the L1 or neutral side of the voltage source, or both, through the centrifugal switch to open the input contact(s) once the motor has reached its operating speed. Then, if the switching assembly has L1 and N contacts touching at the same time, it will not result in a dead short.
Public/Granted literature
- US20100171449A1 Washing Machine Wiring to Reduce Mechanical Timer Contact Welding Public/Granted day:2010-07-08
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