DE441560C - Control for air impact tools - Google Patents

Description

Control for pneumatic impact tools. Pneumatic impact tools with direct exhaust controlled by the working piston and a main control element for the incoming pressure medium as well as two auxiliary control organs, the derivation control of the compression mixture produced with each piston stroke are known.

The invention consists in a particular embodiment, which is in the Drawing is shown schematically in longitudinal section.

The cylinder in which the working piston b is arranged is denoted by a. The exhaust ports controlled by this are indicated by c and c '; d is the control element for the incoming pressure medium and e is the pressure medium connection. f and f 'are connecting channels between the control element d and the associated cylinder chambers g and g'. h and h ' are two further control organs arranged in the channels m, f and m', f ', which on the side facing away from the control element d under the action of the spring! or i ' . From these sides of the valves h and h ', ducts 1 and 1' lead to the renf-speaking cylinder chambers g and g ', while the ducts h @, ugd-k' connect them with the outside air.

The operation of the control is as follows: In the position of the control elements shown, fresh pressure medium exits from e via valve d, channels m and f, cylinder end space g behind the working piston b and moves it in the direction of the arrow, with that in front of the piston Overflowing the exhaust port c 'in the cylinder space g', the compression mixture escapes via Kapall ', past the front surface of the control member h', through channel k '.

As soon as the working piston b has released the channel c with its rear edge has, a sudden pressure drop occurs in the rear cylinder space g, as a result of which the tax, organ d as a result of the burden of the fresh pressure medium on the opposite side closes the Druckmittelzulaßkanal nz and at the same time releases the pressure medium supply to the opposite side via rn '. Here the controller k7 is against the spring! ' moved to the right, whereby the Kapall ' completed and .the compression derivation is terminated. That from the tax body incoming pressure medium flows from m 'through channel f' into the cylinder space g 'and moves the piston in the opposite direction of the arrow.

Meanwhile, the control member has h as a result of the action of the spring i a connection of the rear cylinder chamber g through the channels 1 Z and 'k riding the * outside air produced so that the behind the piston g after overflow of the exhaust ports C resulting mixture can escape through these channels.

As soon as the working piston has released the exhaust port c 'as it continues to fall, the control cycle for this side begins in the same way as described. The channels L and L ' can also open into the channels / and f , as a result of which a complete compression dissipation is achieved.

Claims (1)

PATENT CLAIM: Control for pneumatic impact tools with through the working piston. controlled direct exhaust and a main control element for the incoming pressure medium as well as two auxiliary control elements controlling the discharge of the compression mixture that occurs with each piston stroke, characterized in that the outlet openings (k or k ') leading to the outside of the between the inlet ducts (f or f' ) and the exhaust ports (c or c ') channels opening into the cylinder. (l or l ') are controlled by the auxiliary control elements (h or h') held in the furnace position under spring action, which form a flexible wall part of the inflow ducts (f or ) '), so that they are prevented by excess pressure occurring in them. are pressed outwards against the spring action and thus interrupt the connection of the ducts (L or L ') with the outside air.