Abstract:
The invention relates to a pneumatic hammer device (100, 200) comprising connecting means (156, 256) arranged for connection to a compressed air conduit (102, 202) of an external compressed air source and a striking mechanism (105, 205), which striking mechanism (105, 205) comprises a striking mechanism housing (210) and a striking piston (230) arranged for reciprocating motion in said striking mechanism housing (210), the striking piston (230) having a front piston portion (232) and a rear piston portion (236), wherein the striking piston (230) and the striking mechanism housing (210) together form a front space (240) and a rear space (250), wherein said compressed air conduit (102, 202) is arranged in air flow communication with the front space (240) via a second passage (242) in the striking mechanism housing (210), at which second passage (242) a first valve means (246) is arranged. The striking piston (230) is formed such that an intermediate space (260) is formed between the front piston portion (232) and the rear piston portion (236) and the striking mechanism housing (210), wherein the control means (280) are arranged to alternately be subjected to an air pressure of said rear space (250) respectively said intermediate space (260) during the reciprocating motion of the striking piston (230), and wherein said control means (280) are arranged to control said first valve means (246) based on said air pressure to alternately supply compressed air to the front space (240) and achieving a return movement of the striking piston (230). The invention also relates to a method pertaining to a pneumatic hammer device (100, 200).
Abstract:
An impact tool capable of preventing an impact force from being applied to an intermediate element in a state where the intermediate element and a tool bit are apart from each other is provided. An impact tool 10 which transmits an impact force to a tool bit 12 supported by a casing 13 includes: a cylinder 31 which is attached to the casing 13 and has an opening on one end side thereof to which the tool bit 12 is inserted; an intermediate element 57 which is provided in an inside of the cylinder 31 so as to be able to move straight, has a projection 58 projecting in a radial direction so as to regulate a range of the straight movement, and transmits the impact force to the tool bit 12; and passages 69 and 70 which communicate a space D in an inside of the cylinder 31 at a position nearer to the tool bit 12 than the projection 58 with the outside of the cylinder 31 and penetrate through the cylinder 31 in the radial direction.
Abstract:
Die Erfindung geht aus von einem Hammerschlagwerk mit einem Werkzeugfutter (24a - e) und einem Döpper (102a - e), der dazu vorgesehen ist, direkt auf ein Einsatzwerkzeug (104a) zu schlagen. Es wird vorgeschlagen, dass der Döpper (102a) ein Koppelmittel (108a - e) aufweist, das zur Übertragung einer Drehbewegung auf das Werkzeugfutter (24a - e) vorgesehen ist.
Abstract:
Die Erfindung betrifft eine Elektrohandwerkzeugmaschine (1), insbesondere Bohr- oder Meißelhammer, mit einer Antriebswelle, insbesondere einem Hammerroh (2), die in einem mit einer Verdrehsicherung versehenen Gleitlager (4) gelagert ist, an das sich eine Dichtungshülse (11) zumindest Bereichsweise axial anschließt. Es ist vorgesehen, dass die Dichtungshülse (11) verdrehsicher angeordnet und drehfest mit dem Gleitlager (4) verbunden ist.