Atlas Copco Aktiebolag

Karl Gustav Berger

Karl G Karden

In a pneumatically powered portable tool there is provided a speed governor and an overspeed safety device the purpose of which are to ensure a predetermined maximum speed by controlling the air inlet flow to the motor. A cup-shaped shell insert (28) is detachably mounted in the housing (10) to form with the latter an air supply passage (58) and to support the valve means (51,53) of the overspeed safety device. The top surface of the shell insert (28) is exposed through an aperture (57) in the housing (10) and carries the maximum speed marking of the tool.

Pneumatic power tool with speed governor

A safety valve for pneumatic tools, comprising first and second valve bodies which are movable relative to each other and which carry cooperating seat surfaces. The first valve body is of tubular shape and is displaceable between a closed and an opened position by means of a lever. The second valve body is pressure balanced and biased by a spring to maintain sealing contact with the first valve body as the latter is displaced. A lever operated arresting means is arranged to lock the second valve body against movement and thereby interrupt the sealing contact between the first and second valve bodies as the first valve body is displaced.

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Nacka, Sweden

Karl Gustav Berger