US 4,057,698 AGranted

Switching mechanism of a timepiece

AssigneeKabushiki Kaisha Daini Seikosha

InventorsYasuichi Nakagawa, Masataka Ikenishi, Yoshio Hozumi, Shozo Kushida, Koichi Tsukutani

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Abstract

A switching mechanism for a timepiece comprising a base plate having first and second bores extending therethrough and intersecting, a circuit board having a surface opposite the second bore and having stationary contacts mounted on the surface opposite the second bore, and a contact member disposed within the second bore and dimensioned to slide therein. The contact member has a transverse bore extending therethrough and alignable with the first bore through the base plate, and the contact member has a conductive lower end portion extending from the base plate and terminating at a contact surface for contacting to electrically connect the stationary contacts on the circuit board. A spring biases the contact member downwardly to a lowered position with the contact surface contacting the stationary contacts on the surface board. A timepiece adjusting stem has an end portion dimensioned for insertion into the first bore and into the traverse bore for maintaining the contact member at a raised position with the contact surface thereof raised from the stationary contacts, and the adjusting stem is slideably mounted in a position aligned with the second bore for permitting the adjusting stem to travel in an axial direction thereof between a retracted position with the stem clear of the transverse bore of the contact member and an operative position with the stem inserted into the first bore of the base plate and into the transverse bore of the contact member to maintain the contact member in a raised position. The transverse bore has a tapered converging portion converging in an inward direction of the contact member so that the end portion of the stem bears against the tapered portion as the stem travels from the retracted to the operative position thereby causing the contact member to rise as the tapered portion of the transverse bore climbs the end portion of the stem traveling inwardly of the contact member until the stem extends into the transverse bore to maintain the contact member in a raised position.

A switching mechanism for a timepiece, comprising:

a base plate having a first bore extending therethrough and having a second bore extending therethrough and intersecting said first bore;
a circuit board having a surface opposite said second bore and having stationary contacts mounted on said surface opposite said second bore;
a contact member dimensioned to slidably fit within the second bore of said base plate and having an axial dimension aligned with said second bore, said contact member having a transverse bore extending therethrough and alignable with the first bore through said base plate, and said contact member having a conductive lower end portion extending from said base plate and terminating at a contact surface for contacting said stationary contacts on said circuit board to complete an electrical connection therebetween;
biasing means comprising a spring for biasing said contact member downwardly to a lowered position with said contact surface contacting said stationary contacts on said circuit board;
an adjusting stem having an end portion dimensioned for insertion into the first bore through said base plate and into the transverse bore through said contact member for maintaining said contact member at a raised position with said contact surface thereof raised from said stationary contacts on said circuit board so that said stationary contacts are in an unconnected condition;
and
mounting means slidably mounting said adjusting stem in an aligned position aligned with the second bore through said base plate for permitting said adjusting stem to travel in an axial direction thereof between a retracted position with said stem clear of the transverse bore through said contact member with said contact member at the lowered position and an operative position with said stem inserted into the first bore of said base plate and into the transverse bore of said contact member to maintain said contact member in the raised position, and wherein said contact member and said stem together include means for raising said contact member from the lowered to the raised position as said stem travels from the retracted to the operative position.

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Abstract

Claims3