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:
Oct. 25, 1994
Filed:
Jun. 16, 1993
Yoshio Ebara, Fujioka, JP;
Furukawa Co., Ltd., , JP;
Okumura Corporation, , JP;
Abstract
A plurality of rods each having a bit at a front end are disposed in parallel to one another so that adjacent bits are displaced to some extent forward and backward, and a striking device operatively connected to each of the rods includes a striking block. The striking block includes a single cylinder block having a plurality of cylinder tubes, and a striking piston is slidably fitted into each of the cylinder tubes. The striking block further includes a change-over valve for changing over between a forward movement and a backward movement of each striking piston. A rear end of each rod is connected through an adapter to a shank rod which is connected to the striking device. In the striking device, a spring is provided between a bearing holder which holds the shank rod rotatably and the adapter to push the rod in a forward direction. When the bit is not reached the rock, the rod is pushed forward by the spring to hold the shank rod at a position before the striking point.