Importance

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Abstract

A switch operable by a piston which is movable within a piston chamber, comprises a switch housing having a longitudinal bore, a hollow housing member extending from one end of the switch housing into the longitudinal bore, a tubular switch member, and a central pin. The switch member is axially movable in the longitudinal bore between a first position remote from the housing member and a second position adjacent to housing member, and has an inner surface with transverse cross-sectional dimensions greater than those of the housing member outer surface within the longitudinal bore. The central pin is fixed to the switch member, extends within the switch member and is radially spaced from the inner surface of the switch member. A helical switch spring engages and extends between the switch member and the housing member with its first end portion received within the housing member and its opposite second end portion surrounding the pin and received within the switch member. The pin and housing member radially support the spring against bending in radial directions in all positions of the switch member. Switch elements are mounted in the switch housing for sensing the position of the switch member.

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First Claim