Power-wrench, a boiling spindle and an operational method
First Claim
1. In a power-wrench bolting spindle comprising:
- (a) a drive shaft and an output shaft which is axially displaceable with respect to the drive shaft against a spring force, the improvement comprising;
(b) a depth sensor comprising means for measuring the depth of bolting wherein;
(b1) a transmitting end of the drive shaft delivering the torque is supported in axially displaceable manner within a receiving end of the output shaft receiving the torque; and
(b2) a coil is mounted within a sleeve of the bolting spindle enclosing at least part of said drive shaft and of said receiving end, said receiving end being displaceable within said coil and concurrently changing inductance of said coil, said change in inductance generating a signal indicative of said depth of bolting.
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Accused Products
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.
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Citations
14 Claims
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1. In a power-wrench bolting spindle comprising:
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(a) a drive shaft and an output shaft which is axially displaceable with respect to the drive shaft against a spring force, the improvement comprising; (b) a depth sensor comprising means for measuring the depth of bolting wherein; (b1) a transmitting end of the drive shaft delivering the torque is supported in axially displaceable manner within a receiving end of the output shaft receiving the torque; and (b2) a coil is mounted within a sleeve of the bolting spindle enclosing at least part of said drive shaft and of said receiving end, said receiving end being displaceable within said coil and concurrently changing inductance of said coil, said change in inductance generating a signal indicative of said depth of bolting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for operating a power-wrench with bolting spindle in a bolting process having:
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(a) a drive shaft and an output shaft which is axially displaceable with respect to the drive shaft against a spring force; (b) a depth sensor comprising means for measuring the depth of bolting wherein; (b1) a transmitting end of the drive shaft delivering the torque is supported in axially displaceable manner within a receiving end of the output shaft receiving the torque; and (b2) a coil is mounted within a sleeve of the bolting spindle enclosing at least part of said drive shaft and of said receiving end, said receiving end being displaceable within said coil and concurrently changing inductance of said coil, said change in inductance generating a signal indicative of said depth of bolting. (c) a motor in operative connection with said drive shaft; (d) a torque sensor mounted between said motor and said drive shaft for said spindle; (e) a regulating circuit for said process; (f) an angular-speed sensor connected to said regulating circuit for measurement of motor or spindle angular speed; (g) an electronic memory storing parameters of said bolting spindle, its drive and said sensors and mounted within said power-wrench; (h) said memory connected through said torque sensor to said regulating circuit; wherein said bolting method is carried out in two operational stages, an application stage and a tightening stage which are separated by a pause, each stage terminating when a shutdown bolting torque (MAL, MAZ) or a shutdown motor current (IAL, IAZ) that is predetermined for them has been reached, wherein in said application stage the bolting angular speed n is controlled by said depth sensor to be lowered from its initial value as it approaches said application stage wherein a screw head or a nut touches a base to a final value (shutdown bolting angular speed nAL) which stops, upon reaching the shutdown bolting torque (MAL) or the shutdown motor current (IAL) respectively, the power-wrench while averting overloading. - View Dependent Claims (12, 13, 14)
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Specification