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Class Information
Number: 173/178
Name: Tool driving or impacting > Automatic control of power operated means > Drive means responsive to torque or speed condition > Having torque responsive clutch
Description: Apparatus wherein a device to engage or to disengage the connection between the drive means and the power means is provided and operates in response to a change in the force applied to the tool to move the tool about an axis.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4756216 |
Turn-on and turn-off control apparatus for electric screw-drivers |
Jul. 12, 1988 |
| 4721169 |
Electric driver with torque-adjustable clutch mechanism |
Jan. 26, 1988 |
| 4712456 |
Electric torsion-controlled screwdriver with an improved automatic turn-off device |
Dec. 15, 1987 |
| 4671364 |
Power-screwdriver device with variable torque adjustment |
Jun. 9, 1987 |
| 4655103 |
Clutch for power screwdrivers |
Apr. 7, 1987 |
| 4650007 |
Rotary power tool |
Mar. 17, 1987 |
| 4614134 |
Overload protection system for planetary gear drive |
Sep. 30, 1986 |
| 4592430 |
Fluid-pressure operated tools |
Jun. 3, 1986 |
| 4576270 |
Torque control and fluid shutoff mechanism for a fluid operated tool |
Mar. 18, 1986 |
| 4513827 |
Rotary tool |
Apr. 30, 1985 |
| 4501335 |
Method and apparatus for use in drill string make up |
Feb. 26, 1985 |
| 4488604 |
Torque control clutch for a power tool |
Dec. 18, 1984 |
| 4458565 |
Torque limiting power screwdriver |
Jul. 10, 1984 |
| 4429775 |
Clutch type torque control device for air driver |
Feb. 7, 1984 |
| 4403663 |
Power-operated torque wrench |
Sep. 13, 1983 |
| 4365962 |
Safety clutch for power-operated hand-held tool |
Dec. 28, 1982 |
| 4328871 |
Power tool speed and torque control mechanism |
May. 11, 1982 |
| 4265320 |
Electrically powered torque-controlled tool |
May. 5, 1981 |
| 4243129 |
Device for tightening a screw joint |
Jan. 6, 1981 |
| 4226311 |
Rotary drive disc brake for drawworks |
Oct. 7, 1980 |
| 4215594 |
Torque responsive speed shift mechanism for power tool |
Aug. 5, 1980 |
| 4154308 |
Low torque automatic screwdriver |
May. 15, 1979 |
| 4147219 |
Two-speed offset nutrunner |
Apr. 3, 1979 |
| 4088197 |
Power tool |
May. 9, 1978 |
| 4078618 |
Torque controller shutoff mechanism |
Mar. 14, 1978 |
| 4071092 |
Pneumatic screwdriver with torque responsive shut-off |
Jan. 31, 1978 |
| 4064948 |
Power wrench |
Dec. 27, 1977 |
| 4063625 |
Improved screw or nut runner |
Dec. 20, 1977 |
| 4049104 |
Power operated torque tool |
Sep. 20, 1977 |
| 4019589 |
Pulse motor nut runner |
Apr. 26, 1977 |
| 4006785 |
Power tool |
Feb. 8, 1977 |
| 3974884 |
Power wrench with magnetic sleeves for variable torque output |
Aug. 17, 1976 |
| 3960035 |
Torque responsive speed shifting mechanism for power tool |
Jun. 1, 1976 |
| 3956905 |
Clutch |
May. 18, 1976 |
| 3937036 |
Rotary driving tool having a torque responsive clutch |
Feb. 10, 1976 |
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