An automatic drilling machine for simultaneously drilling at least two holes through a surface of a crosspiece. The machine comprises an automatic drilling unit having at least two tool holders, each one adapted for receiving a drilling tool. The automatic drilling unit has a cross-shaped channel configured to receive, at least partially, the crosspiece to be drilled inside the automatic drilling unit with. The tool holders are arranged, such as, when the drilling machine is mounted with the crosspiece to be drilled, the tool holders are positioned in accordance with the locations of the crosspiece where a hole is to be drilled.

A method of processing a workpiece comprises identifying processing locations on the workpiece, drilling a first hole at one of the processing locations using a rotary drive, sensing a flow of fluid while drilling, generating an operation signal based on the flow, comparing the duration interval of the operation signal to a predetermined temporal value, and drilling a different hole at a different processing location based on the duration interval and the temporal value.

A portable power tool includes a housing, a rotation motor supported in the housing and drivingly connected to an output shaft, and a connection device for attachment of a working implement to the output shaft. The connection device includes a conical coaxial socket portion formed integral with the output shaft and the working implement carrying collet to be received in the socket portion. The collet is radially elastic and intended to exert a radial clamping force on the working implement. A retaining sleeve partly surrounds the output shaft and is coupled to the output shaft via a thread connection. The retaining sleeve is provided with a radial inner flange for engaging and transferring an axial thrust force onto the collet to obtain a radial clamping force on the working implement introduced in the collet as the thread connection is tightened.

A portable power tool includes a housing, a rotation motor supported in the housing and drivingly connected to an output shaft, and a connection device for attachment of a working implement to the output shaft. The connection device includes a conical coaxial socket portion formed integral with the output shaft and the working implement carrying collet to be received in the socket portion. The collet is radially elastic and intended to exert a radial clamping force on the working implement. A retaining sleeve partly surrounds the output shaft and is coupled to the output shaft via a thread connection. The retaining sleeve is provided with a radial inner flange for engaging and transferring an axial thrust force onto the collet to obtain a radial clamping force on the working implement introduced in the collet as the thread connection is tightened.

The pneumatic drill has member defining an air input and an air output and a housing defining an internal cylindrical chamber having bearing surfaces having a through axis. A driven shaft is coupled to the tool engaging chuck that defines a plurality of longitudinal slots. The driven shaft is disposed within the chamber and has a longitudinal axis offset from the through axis. A plurality of vanes each being partially formed of graphite that are individually disposed within one of the plurality's of longitudinal slots. Two of the vanes, the housing, and the driven shaft define a moving compression chamber.

A muffling structure for a pneumatic tool is provided and disposed in an exhaust pipe of the pneumatic tool. The muffling structure includes: an outer cylinder separated from the exhaust pipe by an outer gap-channel and defined with inlet and outlet ends, with the outlet end having a stop portion; an inner cylinder defined with an upstream end and a downstream end, the downstream end passing the inlet end to protrude into the outer cylinder and abut against the stop portion. The upstream end protrudes from the inlet end and has a baffling plate. The baffling plate has an area not less than the inlet end and separates from the exhaust pipe by a gap. An inner gap-channel is formed between the inner and outer cylinders. A communication opening whereby the outer and inner gap-channels are in communication is formed between the baffling plate and the inlet end.

A muffling structure for a pneumatic tool is provided and disposed in an exhaust pipe of the pneumatic tool. The muffling structure includes: an outer cylinder separated from the exhaust pipe by an outer gap-channel and defined with inlet and outlet ends, with the outlet end having a stop portion; an inner cylinder defined with an upstream end and a downstream end, the downstream end passing the inlet end to protrude into the outer cylinder and abut against the stop portion. The upstream end protrudes from the inlet end and has a baffling plate. The baffling plate has an area not less than the inlet end and separates from the exhaust pipe by a gap. An inner gap-channel is formed between the inner and outer cylinders. A communication opening whereby the outer and inner gap-channels are in communication is formed between the baffling plate and the inlet end.

A portable power drill (11) is disclosed having a chuck or drill collar (14) at one end and a substantially cylindrical (or frusto-conical) twist throttle handle (25, 125, 225) at the other end. Rotation of the handle in the direction of forward rotation of the chuck decreases the drill speed and, conversely, rotation of the handle in the direction of reverse rotation of the chuck increases the drill speed. Consequently, in the event of an auger locked in the chuck becoming jammed, the reaction forces experienced by the drill unit rotate the drill unit in a direction such that throttle decreases the drill speed. In addition, the drill unit is provided with forward (44) and reverse gears (45) and a forward/reverse selection mechanism (48, 50, 51) which is actuated by a forward force, or a withdrawing force respectively being applied to the drill unit via an operator who holds the handles (20, 25) of the drill unit.

Mechanisms for reducing power output of a power tool by restricting airflow into the motor of the tool. The power regulator can be implemented in only one of the rotational directions, for example, the forward (or clockwise) direction, and can be independent of the forward/reverse mechanism to avoid a user becoming confused as to the source of tactile feedback. By limiting air input to the motor, rather than bleeding out motor output, the mechanisms prevent wasted power output. Also, the power regulation mechanism can be located near the motor to more effectively restrict airflow.

An automatic drilling machine for simultaneously drilling at least two holes through a surface of a crosspiece. The machine comprises an automatic drilling unit having at least two tool holders, each one adapted for receiving a drilling tool. The automatic drilling unit has a cross-shaped channel configured to receive, at least partially, the crosspiece to be drilled inside the automatic drilling unit with. The tool holders are arranged, such as, when the drilling machine is mounted with the crosspiece to be drilled, the tool holders are positioned in accordance with the locations of the crosspiece where a hole is to be drilled.