Operator sensing circuit for disabling motor of power equipment

Details Operator sensing circuit for disabling motor of power equipment Operator sensing circuit for disabling motor of power equipment

2006-04-25

2006-04-25

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S678000, C200S600000

Reexamination Certificate

active

07034552

ABSTRACT:
A calibrated operator-sensing circuit having a microcontroller that commands a charge-transfer sensor to send a sensor charge signal to a capacitive sensing electrode. The sensor receives a discharge signal from the electrode and outputs a corresponding raw data signal to the microcontroller that in turn sends a signal that disables the motor of a unit of power equipment upon the absence of an operator's hand on a hand-gripping surface of the equipment. The capacitive operator-hand sensing electrode operates within a predetermined output capacitor discharge range that includes preselected binary digit values that designate hands-off and hands-on conditions on the hand-gripping surface. The capacitor discharge range is effective to distinguish between the presence of an operator's hand and foreign material on the gripping surface for avoiding a false hands-on signal. The operator-hand sensing electrode includes an inner dielectric material layer contiguously disposed on a metal handle portion of the power equipment, a metal sheet foil conductor material layer contiguously disposed on the dielectric material, and an outer dielectric hand-grip material having a hand-gripping surface.

REFERENCES:
patent: 2725548 (1955-11-01), Harris
patent: 3703217 (1972-11-01), Kullick et al.
patent: 4145864 (1979-03-01), Brewster, Jr.
patent: 4814632 (1989-03-01), Glaeser et al.
patent: 5583386 (1996-12-01), Meixner et al.
patent: 6501281 (2002-12-01), Rundo
patent: 6590171 (2003-07-01), Wolf et al.
patent: 6894507 (2005-05-01), Morimoto
patent: 2003/0202851 (2003-10-01), Kovarik
patent: 43 44 187 (1993-12-01), None
patent: 0701917 (1995-09-01), None

Affiliated with

Also associated with

Rating

Operator sensing circuit for disabling motor of power equipment does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Operator sensing circuit for disabling motor of power equipment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Operator sensing circuit for disabling motor of power equipment will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3604901