Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Patent
1987-05-01
1989-03-21
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Responsive to torque on work
81469, 173 6, 173 11, B25B 2314
Patent
active
048133124
ABSTRACT:
A power-wrench bolting spindle (1) is used to insert and tighten screws or nuts. The bolting spindle is driven at one end by a motor through a reduction gear (5) and at its other end a bolting tool is seated. A torque sensor (7) is mounted between the motor and the spindle. During bolting, other essential data besides the bolting torque are ascertained. The bolting spindle is equipped with a depth sensor (24) connected to the regulating circuit to measure the depth of bolting. An angular-speed sensor is connected to the regulating circuit and measures the motor or spindle angular speed. The bolting procedure is carried out in two operational stages separated by a pause, namely an application stage (L) and a tightening stage (Z). Each of these operational stages terminates when a specific shutdown bolting torque is reached. Due to the control by the depth sensor, the bolting angular speed is lowered from its initial value when approaching the application stage to a final value which, when the shutdown bolting torque is reached, allows stopping without overloading.
REFERENCES:
patent: 3965778 (1976-06-01), Aspers et al.
patent: 3974685 (1976-08-01), Walker
patent: 4162639 (1979-07-01), Gill
patent: 4515045 (1985-05-01), Gnatchenko et al.
patent: 4617843 (1986-10-01), Nishida et al.
patent: 4685050 (1987-08-01), Polzer et al.
Smith James G.
Wells Gilbert L.
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