Stone working – Splitting – shearing – and punching
Patent
1990-07-12
1992-05-12
Rose, Robert
Stone working
Splitting, shearing, and punching
173 50, 173 51, 175108, E21B 600
Patent
active
051118017
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to an apparatus for making a slit shaped hole in a rock and a concrete surface, and more particularly to an apparatus for forming a slit in a rock and a concrete surface, which is provided with a swingable plate type bit having cutting edge portions mounted on the leading end thereof.
BACKGROUND ART OF THE INVENTION
In a prior art apparatus of the kind specified above for forming a slit in a rock and a concrete surface, such as the one disclosed in Japanese Laid-Open Patent Application No. SHO 60-5996, an apparatus for making a plurality of holes uses a plurality of drills. Further, a method of continuously making holes in partially overlapped relationship is disclosed in Japanese Laid-Open Patent Application No. SHO 61-31591.
While it has been expected to develop an apparatus for forming a slit efficiently in a rock and a concrete surface, the above-mentioned prior apparatus and method have posed the following problems. inner surfaces of the slits.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above-mentioned circumstances in the prior art, and has for its object to provide an apparatus for forming a slit in a rock and a concrete surface, which has a simple construction to enable a slit or hole having a predetermined width and a smooth inner surface to be made efficiently.
Another object of the present invention is to provide an apparatus for forming a slit in a rock and a concrete surface, which has a simple construction to enable a deep slit having a predetermined width and a smooth surface to be made efficiently.
A further object of the present invention is to provide an apparatus for forming a slit in a rock and a concrete surface, arranged such that increase in boring cost due to frequent replacement of bits can be suppressed.
To achieve the above-mentioned objects, according to a first aspect of the present invention there is provided an apparatus for forming a slit in a rock and a concrete surface comprising a frame supported in such a manner that it may be turned freely in the vertical direction; a sliding base mounted on the frame in such a manner that it may be slidably moved in the longitudinal direction thereof; a striking means fixedly secured onto the sliding base and having an actuating shaft; a striking plate extending forwardly along the frame and fixedly secured to the leading end of the shaft; two lengths of longitudinally extending rods spaced apart widthwise of the frame and in parallel with each other, each of the rods having one drill bit mounted on the leading end thereof; a first support base fixedly secured to the front end portion of the frame so as to support the portions of these rods near the leading ends thereof such that they may be slidably moved forwardly in the longitudinal direction of the frame; a second rod supporting means fixedly mounted on the sliding base and adapted to slidably support the portions of these rods near the base or trailing ends thereof so as to allow the base ends of the two lengths of rods to contact the contact surface of the striking plate; a plate having a plate type bit mounted on the leading end thereof, the plate being located in between the two lengths of rods such that the plate type bit is disposed somewhat behind the drill bits when not in use and the base end of the plate is kept into contact with the contact surface of the striking plate; and a plate swinging means for swinging the plate widthwise of the frame.
According to a second aspect of the present invention, there is provided an apparatus for forming a slit in rock or a concrete surface, characterized in that the plate type bit as set forth in the first aspect has cutting edge portions mounted on the leading end thereof.
Further, according to a third aspect of the present invention, there is provided an apparatus for forming a slit in a rock and a concrete surface, characterized in that the plate type bit as set forth in the first aspect consists of a plurality of individually detachable
REFERENCES:
patent: 282382 (1883-07-01), Shedlock
patent: 640621 (1900-01-01), Bailey
patent: 2683021 (1954-07-01), Braver
patent: 3612193 (1971-10-01), Hirata
patent: 4681170 (1987-07-01), Ohi
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