Time delay device

A time delay device adapted to be used in cooperation with a piece of equipment for which a predetermined time delay is required between an actuating action and subsequent operation thereof;

• said time delay device comprising a piston means cooperating, in use, with said equipment, biasing means to move said piston means between a first position in which the equipment remains in a non-operating condition and a second position in which said equipment is allowed to operate, holding means to hold said piston means in said first position, a reservoir of fluid, having a predetermined viscosity, adapted to be acted upon by said piston means, said reservoir communicating with a length of small bore tubing, whereby upon movement of said piston means fluid will be displaced from said reservoir through said tubing, with the rate of movement of said piston means, and therefore the time for said piston means to move from said first to said second position under the action of said biasing means, being dictated by the viscosity of said fluid in the reservoir and the length of said tubing, thus providing for the predetermined time delay between actuation by release of said holding means and movement of said piston means under the action of said biasing means to said second position to allow operation of said equipment.