IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0313648
(1981-10-22)
|
우선권정보 |
DE-3043264 (1980-11-15) |
발명자
/ 주소 |
- Gnther Klaus (Stuttgart DEX) Hornung Friedrich (Stuttgart DEX) Paule Kurt (Stuttgart DEX) Schdlich Fritz (Leinfelden-Echterdingen DEX)
|
출원인 / 주소 |
- Robert Bosch GmbH (Stuttgart DEX 03)
|
인용정보 |
피인용 횟수 :
22 인용 특허 :
0 |
초록
▼
To permit operation of the power tool only if both hands of an operator are engaged, the tool is formed with a handle portion which has a sensing surface thereon, electrically coupled to a current flow sensing circuit, preferably including an opto-coupler or a field-effect transistor (FET) circuit w
To permit operation of the power tool only if both hands of an operator are engaged, the tool is formed with a handle portion which has a sensing surface thereon, electrically coupled to a current flow sensing circuit, preferably including an opto-coupler or a field-effect transistor (FET) circuit which permits firing of a triac, thyristor, or the like only if current flows over the sensing surface by area contact therewith. The sensing surface is energized, preferably, from a resistive or capacitative voltage divider; the capacitative voltage divider has the advantage that the triac firing circuit can cause the triac to fire during null or zero crossings of ac supplied power. If a locking-type switch is used, two handles or touch-areas are needed; if a spring-loaded switch is provided, it can function as one safety element, and a touch-area sensing surface as the other.
대표청구항
▼
Operator safety system for power tools having a power supply connection (1, 2); a motor (17); a controlled switch (16) coupled to the motor for selective connection of the motor to the power supply connection; and an operator touch-controlled switch including at least one electrically responsive sen
Operator safety system for power tools having a power supply connection (1, 2); a motor (17); a controlled switch (16) coupled to the motor for selective connection of the motor to the power supply connection; and an operator touch-controlled switch including at least one electrically responsive sensing surface (12, 13, 29, 53, 54, 74) requiring surface engagement of at least a portion thereof by a hand of the operator for activation thereof to enable the tool to operate, and an energization and control circuit for said touch-controlled switch comprising a voltge divider (4, 6; 22, 25; 40, 41, 43, 44; 65, 72, 66, 68) connected to the power supply connection, said voltage divider having a common junction or tap point (7, 23, 45, 67, 80); a coupling circuit (10, 11; 28; 54, 58; 75) coupling the at least one sensing surface to the common junction; and an electrical recognition network (8, 18, 9; 27, 47, 48; 69, 73) coupled to the common junction and connected to and controlling the controlled switch (16) to ON condition and thus permit energization of the motor only if the at least one sensing surface is engaged by a hand of the operator.
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