Successive hole boring machine and lost strike preventing device for successive hole boring machine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 25, 1994
Grant Date -
N/A
app pub date -
Jun 16, 1993
filing date -
Jun 16, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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