Repco Inc.

Harold Leslie Wood

A torque wrench having a reaction bar and an arm extending laterally in the same direction from a work engaging head. The arm is flexed in response to torque applied to the head through the bar and cooperable members on the bar and arm respectively engage as a consequence of that flexing. The member on the bar is a pivoted lever which responds to the aforementioned engagement to swing towards a signal generating position at which it causes a switch to operate to close a circuit contained within a handle part of the bar. The circuit includes audible and visible signal means and those means are energized while the circuit remains closed. The switch is normally urged towards a circuit closed position but is prevented from reaching that position by a blocking member, and the aforementioned pivoted lever renders that blocking member inoperative when the pivoted lever is swung into its signal generating position. Thus, the signals continue to be generated until the pivoted lever is moved back from the signal generating position. Lost motion means functions to allow some relative movement between the pivoted lever and blocking member.

Torque wrench

A torque wrench of the 'break' type in which the handle moves relative to the workhead when the preselected tension has been reached, thereby providing a signal which can be felt by the user. The handle is pivotally connected to the workhead, and a tension control mechanism acts between the handle and workhead to prevent pivotal movement of the handle in one direction relative to the workhead until the preselected tension has been reached. The tension control mechanism is adjustable to allow variation of the 'break torque,' and includes a lever which is pivotally connected to the workhead and coacts with a reaction member connected to the handle. A spring influenced plunger acts on the lever through a toggle bar to hold the lever in an operative position, at which position the handle is held against pivotal movement relative to the workhead, and the toggle bar has its longitudinal axis at an angle to the longitudinal axis of the plunger. When the preselected tension is reached the lever swings about its pivot causing the toggle bar to move closer towards axial alignment with the plunger thereby reducing resistance to pivotal movement of the handle relative to the workhead. Adjustment of the preselected tension is achieved by altering the position of engagement between the lever and reaction member relative to the pivotal axis of the lever.

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Footscray, Australia

Harold Leslie Wood