A pneumatic hammer including a connector for connection to an external compressed air source and a striking mechanism. The striking mechanism includes a housing and a piston arranged for reciprocating motion in the housing. The striking piston has front and rear piston portions. The piston and the housing form front and rear spaces. A compressed air conduit is arranged in airflow communication with the front space via a second passage in the housing, at which second passage a first valve is arranged. There is an intermediate space between the front and rear piston portions and the housing. The control unit is alternately subjected to air pressure of the rear space with respect to the intermediate space during reciprocating motion of the piston. The control unit controls the first valve based on air pressure to alternately supply compressed air to the front space and achieving a return movement of the piston.

A hydraulic hammer is provided. The hydraulic hammer includes a fluid inlet configured to receive a pressurized fluid for running the hydraulic hammer and a fluid outlet for discharging hydraulic fluid from the hydraulic hammer. A bypass passage fluidly connects the fluid inlet and the fluid outlet, the bypass passage has a bypass inlet fluidly connected to the fluid inlet and a bypass outlet fluidly connected to the fluid outlet. An automatic shut-off valve is disposed in the bypass passage between the bypass inlet and the bypass outlet and is configured to open or close the bypass passage. The automatic shut-off valve is configured to open the bypass passage under pressure of the pressurized fluid on continuous running of the hydraulic hammer for a set time to stop the hammer.

A hydraulic hammer is provided. The hydraulic hammer includes a fluid inlet configured to receive a pressurized fluid for running the hydraulic hammer and a fluid outlet for discharging hydraulic fluid from the hydraulic hammer. A bypass passage fluidly connects the fluid inlet and the fluid outlet, the bypass passage has a bypass inlet fluidly connected to the fluid inlet and a bypass outlet fluidly connected to the fluid outlet. An automatic shut-off valve is disposed in the bypass passage between the bypass inlet and the bypass outlet and is configured to open or close the bypass passage. The automatic shut-off valve is configured to open the bypass passage under pressure of the pressurized fluid on continuous running of the hydraulic hammer for a set time to stop the hammer.

A carbon-fiber seat for a pneumatic hammer has a rear valve, a front valve, and a valve plate. The rear valve, the front valve, and the valve plate are made of carbon fiber materials. The rear valve has an inlet recess, an inlet passage, an exhaust annular recess, at least one exhaust port, and at least one exhaust passage. The front valve abuts the rear valve and has a communicating recess, an exhaust mount, and at least one exhaust port. The communicating recess is formed through the front valve, and communicates with the inlet recess of the rear valve. The exhaust mount is formed on and protrudes axially from the front valve around the communicating recess. The at least one exhaust port is formed in the exhaust mount such that the communicating recess communicates with the outer recess. The valve plate is deposited between the two valves.

A carbon-fiber seat for a pneumatic hammer has a rear valve, a front valve, and a valve plate. The rear valve, the front valve, and the valve plate are made of carbon fiber materials. The rear valve has an inlet recess, an inlet passage, an exhaust annular recess, at least one exhaust port, and at least one exhaust passage. The front valve abuts the rear valve and has a communicating recess, an exhaust mount, and at least one exhaust port. The communicating recess is formed through the front valve, and communicates with the inlet recess of the rear valve. The exhaust mount is formed on and protrudes axially from the front valve around the communicating recess. The at least one exhaust port is formed in the exhaust mount such that the communicating recess communicates with the outer recess. The valve plate is deposited between the two valves.

Hammering power of a hydraulic hammering device is improved by shortening a piston stroke, while keeping hammering energy. The device includes a cylinder, a piston slidingly fitted in the cylinder, and a piston front chamber and a piston rear chamber defined between an outer circumferential surface of the piston and an inner circumferential surface of the cylinder and disposed separately from each other at front and rear, respectively, in an axial direction. The device also includes a switching-valve mechanism driving the piston by switching at least one of the piston front or rear chamber into communication with at least one of a high pressure circuit or a low pressure circuit, and an acceleration piston disposed behind the piston and coming in contact with the piston during a retreat stroke of the piston to urge the piston forward in cooperation with braking force by pressurized oil acting on the piston.

Hammering power of a hydraulic hammering device is improved by shortening a piston stroke, while keeping hammering energy. The device includes a cylinder, a piston slidingly fitted in the cylinder, and a piston front chamber and a piston rear chamber defined between an outer circumferential surface of the piston and an inner circumferential surface of the cylinder and disposed separately from each other at front and rear, respectively, in an axial direction. The device also includes a switching-valve mechanism driving the piston by switching at least one of the piston front or rear chamber into communication with at least one of a high pressure circuit or a low pressure circuit, and an acceleration piston disposed behind the piston and coming in contact with the piston during a retreat stroke of the piston to urge the piston forward in cooperation with braking force by pressurized oil acting on the piston.

The invention relates to an impact piston device for an impact drill drive, comprising an impact piston, which is movably mounted in a piston housing so as to be reversible between a front striking position and a rear retracted position, the impact piston having at least one front pressurizing surface and at least one rear pressurizing surface, at least one front pressure chamber and a rear pressure chamber being formed together with the piston housing, a hydraulic fluid feed, a hydraulic fluid drain, a first control device, by which at least the rear pressure chamber for effecting the reversing movement of the impact piston is connected alternately to the hydraulic fluid feed and the hydraulic fluid drain, and a second control device, with which at least one stroke path of the impact piston within the piston housing can be adjusted, the first control device having an actuatable first control valve and the second control device having an actuatable second control valve. According to the invention, it is provided that the first control valve and second control valve are arranged in a common valve housing.

A processor-controlled, energy-based therapy apparatus includes a device configured to provide therapeutic energy to a patient and a processor that controls the output of the device. The output of the device is based on output profiles programmed into the processor. The output profiles include a therapeutic energy output profile and a ramp-up energy profile. The therapeutic energy output profile includes a desired target energy level and a therapeutic duration for controlling the output of the device during a therapeutic period. The ramp-up energy output profile includes an initial treatment energy level and a ramp-up duration for controlling the output of the device during a ramp-up period. The energy output specified by the ramp-up energy output profile incrementally increases over the ramp-up duration as a function of the desired target energy level and the ramp-up duration.

A processor-controlled, energy-based therapy apparatus includes a device configured to provide therapeutic energy to a patient and a processor that controls the output of the device. The output of the device is based on output profiles programmed into the processor. The output profiles include a therapeutic energy output profile and a ramp-up energy profile. The therapeutic energy output profile includes a desired target energy level and a therapeutic duration for controlling the output of the device during a therapeutic period. The ramp-up energy output profile includes an initial treatment energy level and a ramp-up duration for controlling the output of the device during a ramp-up period. The energy output specified by the ramp-up energy output profile incrementally increases over the ramp-up duration as a function of the desired target energy level and the ramp-up duration.