Abstract: A hookswitch actuator including an activating mechanism which maintains the hookswitch circuit of a telephone in an "on hook" state when the activating mechanism is in a first position, or in an "off hook" state when the activating mechanism is in the second position. The movement of the activating mechanism between the two positions is accomplished through the use of a shape memory alloy mechanism. The shape memory alloy mechanism is coupled to the activating mechanism in such a way that heating or cooling of the shape memory alloy mechanism moves the activating mechanism between its two positions. Control of the heating and cooling of the shape memory alloy mechanism is effectuated by controlling the amount of electric current passing through it.

Abstract: A multiple function control for an electric lift truck which facilitates moving the truck while the load carriage is being raised or lowered. Two vehicles speeds in forward and reverse can be selected by means of a pair of pushbuttons (34, 36) located on the load carriage lift control handle (32), independent of the normal vehicle travel control (28). Circuit means are provided to prevent simultaneous selection of both forward and reverse drive motor directions and to prevent adverse results from simultaneous operation of the normal vehicle travel control and the pushbutton control.