Patent ID: 11933401
Assignee: ENPLAS CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 0:
1. A plunger configured to be attached to a tip of a pin and to slide inside of a cylindrical member, the plunger comprising:
a plunger body made of a resin and including a recess that opens at a base end, the recess being provided for inserting a part of the pin;
a first surface disposed on an outer peripheral surface of the plunger body and configured to come into contact with an inner peripheral surface of the cylindrical member;
a second surface disposed on a base end side relative to the first surface in the outer peripheral surface of the plunger body, the second surface having an outer diameter that is smaller than that of the first surface;
an outer stepped surface disposed between the first surface and the second surface in the outer peripheral surface of the plunger body;
a first housing disposed in an area in the recess, at least a part of the area being at a same position as the second surface in a sliding direction of the plunger, the first housing being provided for housing the tip part of the pin;
a second housing disposed on the base end side relative to the first housing in the recess, the second housing having an inner diameter that is smaller than a largest inner diameter of the first housing;
an inner stepped surface disposed between the first housing and the second housing in the recess; and
a ring part disposed on the outer peripheral surface of the plunger body, a portion of the ring part being located on a base end side relative to a same position as the inner stepped surface in the sliding direction of the plunger;
wherein an outer diameter of the first surface is smaller than the outer diameter of the ring part.