Provided is a bolting tool that includes a mounting portion and a torque transfer portion. A bolt assembly is mounted to the mounting portion. The bolt assembly includes a bolt and a nut threaded onto a position along an external threaded portion of the bolt. The torque transfer portion transfers tightening torque to the bolt and the nut of the bolt assembly mounted to the mounting portion. The mounting portion includes a bolt engagement portion, which is engageable with a head of the bolt, a nut engagement portion, which is engageable with the nut, and a coupling portion, which couples the nut engagement portion to the bolt engagement portion coaxially and with a predetermined spacing therebetween.

The invention is directed to a method for caulking a caulking member such as a caulking nut or a caulking bolt to a metal plate. The metal plate is arranged on a die having a caulking protrusion formed on an end surface thereof, the caulking member is arranged on the metal plate while a position of a caulking recess portion of the caulking member is aligned with the caulking protrusion, and a punch is brought closer to the die so that the caulking member is pressed against the metal plate. While an upper surface of the metal plate in a position opposite to the caulking recess portion is restricted by a downward protruding portion of the punch or by the caulking member, the metal plate is plastically fluidized into the caulking recess portion, so that the caulking member is caulked without boring a hole in the metal plate.

The present invention relates to a method for the punching in and attachment of the fastener element to a planar workpiece, in particular to a sheet metal part. During the punching in of the fastener element in the workpiece a movably arranged die plunger of the die button is pressed with a predetermined pressing force against the workpiece. The pressing force is adapted such that the die plunger first moves once a slug has been cut out of the workpiece by a piercing section of the fastener element.

A method of torque control and a torque control apparatus for a pneumatic torque tool are provided. The method includes: connecting a torque control apparatus between an air supply system and a pneumatic torque tool; under predetermined working and control conditions, driving the pneumatic torque tool at the first and second working air pressures to calibrate output torque, and to obtain maximum and minimum torque values; constructing correspondence curve between air pressure and torque value based on the first and second working air pressures and the maximum and minimum torque values obtained; entering any target torque value ranging from minimum torque value to maximum torque value of the correspondence curve to obtain a corresponding working air pressure value and drive the pneumatic torque tool; and verifying whether all working and control conditions are controlled within a predetermined range of variation to control the output torque.

A method of torque control and a torque control apparatus for a pneumatic torque tool are provided. The method includes: connecting a torque control apparatus between an air supply system and a pneumatic torque tool; under predetermined working and control conditions, driving the pneumatic torque tool at the first and second working air pressures to calibrate output torque, and to obtain maximum and minimum torque values; constructing correspondence curve between air pressure and torque value based on the first and second working air pressures and the maximum and minimum torque values obtained; entering any target torque value ranging from minimum torque value to maximum torque value of the correspondence curve to obtain a corresponding working air pressure value and drive the pneumatic torque tool; and verifying whether all working and control conditions are controlled within a predetermined range of variation to control the output torque.

A portable device for tightening or removing lug nuts includes a housing defining an interior reservoir, a first conduit, and a second conduit. The first conduit is in fluid communication with the interior reservoir and the second conduit is in fluid communication with the first conduit. A receiving chamber is provided within the housing and is also in fluid communication with the second housing. A hand pump associated with the device is operable to draw fluid within the reservoir into the first conduit, and also to force the fluid in the first conduit through the second conduit and into the receiving chamber. A first gear is rotatably disposed within the housing. A plurality of second gears are rotatably disposed within the housing. The plurality of second gears engage the first gear so that rotation of the first gear causes a corresponding rotation of the plurality of second gears. Each of the plurality of second gears is configured to engage a lug nut associated within the wheel of a vehicle.

A screw length determination system capable of quickly determining the length of a screw is obtained. A PLC (10) is equipped with a determination part for measuring the moving speed of a driver for tightening screws in the axial direction of the driver from an initial position until a screw contacts and is screwed into a workpiece, and determining the length of the screw on the basis of the time from the start of movement from the initial position until the moving speed changes.

A screw length determination system capable of quickly determining the length of a screw is obtained. A PLC (10) is equipped with a determination part for measuring the moving speed of a driver for tightening screws in the axial direction of the driver from an initial position until a screw contacts and is screwed into a workpiece, and determining the length of the screw on the basis of the time from the start of movement from the initial position until the moving speed changes.

Provided is a screw length determination system capable of determining the length of a screw with a high degree of accuracy. A PLC (10) determines the length of a screw on the basis of the amount of rotation or the position in the axial direction of a driver during a period lasting from the time when the screw completes its descent until any time from among the time when provisional seating occurs, the time when the primary tightening period ends and the time when the period of holding for primary tightening ends.

Provided is a screw length determination system capable of determining the length of a screw with a high degree of accuracy. A PLC (10) determines the length of a screw on the basis of the amount of rotation or the position in the axial direction of a driver during a period lasting from the time when the screw completes its descent until any time from among the time when provisional seating occurs, the time when the primary tightening period ends and the time when the period of holding for primary tightening ends.