公开(公告)号：JPS60219104A

公开(公告)日：1985-11-01

申请号：JP7593684

申请日：1984-04-16

Applicant: BRIDGESTONE CORP

Inventor： HASHIMOTO TAKATSUGU ,  TOMITA SEIJI

IPC: B60C11/16

Abstract: PURPOSE:To prevent damage to both road face and tip by disposing the tip retractable in the axial direction of a shunk and fill the shunk with water tightly to liquid in position adjacent to the tip, thereby having the tip projectable when the road face is frozen only. CONSTITUTION:A tip 3 which is provided at the end of a shunk 1 is disposed retractably in the axial direction of the shunk 1. The retractable action is restricted by the abutment of the flange 4 formed at the rear end of the tip 3 with respect to the front and the rear face 5a and 5b of a large diameter hole 5 made in the end part of the shunk 1. A liquid chamber 8 which extends in the axial direction of the shunk and is communicated with the large diameter hole 5 via the abutment stage 7 is formed inside the shunk 1, and is filled tightly to liquid with water 9. In such spike, when temperature of the water 9 is over the melting point thereof, damage to the road face by the effect of the tip 3 can be prevented effectively while when the road face is frozen, the water 9 is turned into ice so that the tip projects by the demanded length from the end of the shunk 1.