The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 2004
Filed:
Nov. 30, 2001
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
Prior to forming a thermal spray coating layer ( ) on an end face ( B′) of a structural base material ( ′) to be shaped into a boss, firstly an inner masking member ( ) is fitted in an original hole ( A′) of the structural base material ( ′) and then an outer masking member ( ) is fitted on outer peripheral side of the structural base material ( ′). In the next place, by the use of a hard material, a thermal spray coating layer ( ) is formed on an annular coating area ( B ′) which is exposed between the inner and outer masking members ( ) and ( ). Surface areas on the end face ( B′) of the structural base material ( ′), corresponding to an allowance range of a machining operation by which the original hole ( A′) is ultimately shaped into a joint pin hole of a specified diameter, are left as a non-coating area ( B ′) free of the thermal spray coating layer ( ). Therefore, the original hole ( A′) in the structural base material ( ′) can be machined into a final joint pin hole by means of a cutting tool, without experiencing cracking troubles which would otherwise occur to the thermal spray coating layer ( ) during the machining operation.