Abstract: A riveting device for the assemblage of two or more sheet metal sections (A, B) of a structure comprising a working unit (14) operable on one side of the sections (A, B) to be assembled and a clamping and bucking unit (26) operable one the opposite side of the sections. Both units (14, 26) comprise clamping means (16 and 31, 62, 72) respectively, by which the sections (A, B) are clamped together during the entire working cycle in each rivet position, i.e. during hole making, seal compound application, rivet insertion and rivet upsetting. The clamping means of the bucking unit (26) comprises a head (62; 90), one or more low inertia contact elements (72; 94) and a resilient impact absorbing means (66; 101, 102) provided between the contact element or elements (72; 94) and the head (62; 90).

Abstract: A power operated percussion tool in which a shoulder (28) in the tool housing (10, 17) defines a rear rest position for working implement (12) attached to the tool, and in which an energy absorbing bias unit (23, 31) is arranged to resiliently load the working implement (12) toward the rest position. The bias unit (23, 31) comprises a spring (23) and a shock wave mitigating ring assembly (31) and acts between a rearwardly facing shoulder (22) in the housing (10, 17) and a forwardly facing shoulder (30) on the working implement (12). The ring assembly (31) includes two spring steel rings (32, 33) formed with mating conical contact surfaces for transforming axial load variations into radial deformation of the rings (32, 33).

Abstract: A vibration damped portable impact tool comprising a pneumatically powered reciprocating mechanism to which a chisel is connected. In the disclosed tool the chisel is rigidly connected to the piston of the reciprocating mechanism so as to move conjointly therewith. The drive mechanism is arranged in a previously known manner to absorb its own acceleration forces whereby the only vibration forces acting on the tool derive from the chisel in its contact with the work piece. By adapting the spring constant relating to bending of the chisel to the entire mass of the tool such that the resonance frequency of that system is lower than the impact frequency, the vibration forces arising at the working end of the chisel are not transmitted to the tool housing.

Abstract: In a hand held power operated percussion tool, the housing (10) is vibration insulated from the impact mechanism to protect the operator from unhealthy vibration forces. In order to form a vibration damped gripping member at or in front of the forward end of the tool housing (10), a sleeve element (20) is supported on the housing (10) for axial adjustability thereon. The sleeve element (20) surrounds the working implement (18) and prevents the operator from using the latter as a grip means. The sleeve element (20) is arrestable in any desired axial position by a conical lock nut (22) threadingly engaging the sleeve element (20) and forming therewith a radially acting clamp.

Abstract: A vibrationless pneumatic impact tool comprises: a housing; a cylinder axially displaceable in the housing; a hammer piston reciprocably driven by pressure air in the cylinder; a recoil cushioning air volume disposed between the housing and the cylinder; a first valve arrangement located in a fixed disposition relative to the housing; and a second valve arrangement located in a fixed disposition relative to the cylinder and arranged to cooperate with the first valve. The first valve comprises at least one air inlet opening communicating with a pressure air source and at least one air venting port communicating with the atmosphere.

Abstract: A pneumatic reciprocating mechanism comprising a working member (11) reciprocably powered in a housing (10) and forming together with a vibration absorbing reaction support member (12) and an elastic seal element (47) a working chamber (49) which is supplied with pressure via an air feed valve (54,55). The latter is positively coupled to the working member (11) and controls the air flow through openings (54) in the reaction support member (12) in response to the relative positions of the working member (11) and the reaction support member (12).The elastic seal element (47) is associated with the working member (11) and has an annular valve collar (48) which is arranged to establish sealing contact with a diverging peripheral wall (52) of the reaction support member (12) by radial expansion due to the air pressure in the working member (49).

Abstract: A power control device for a pneumatic motor includes a pressure air supply flow limiting means in the form of a flow restriction having a diverging, pressure recovering outlet. The device also comprises a load responsive pressure relief means which is located downstream of the flow restriction and which is arranged to gradually release pressure air from the motor into the atmosphere in response to decreasing load applied on the motor. The device is effective in reducing the motor power in response to decreasing load upon the motor. The disclosed motor is a hammer piston impact tool, and the motor load responsive pressure release means comprises the forward end of the motor cylinder and passages on a thrust sleeve which receives the shank of a chisel and which is slidingly received in the cylinder.