Stone working – Dressing – Arm-supported tool
Reexamination Certificate
1999-09-15
2001-07-10
Hail, III, Joseph J. (Department: 3723)
Stone working
Dressing
Arm-supported tool
C125S013010, C125S014000
Reexamination Certificate
active
06257221
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cutting machine that is disposed at an end of an arm of a civil construction machine such as a backhoe and that is adapted for cutting a large and hard material such as a concrete pipe on site.
2. Description of the Prior Art
Conventionally, a desired attachment is selectively mounted on an end of an arm of a backhoe or the like so as to perform a desired civil construction task other than work using a bucket. On a civil construction site, concrete products may be manually cut. Such work is dangerous and results in worker's accidents. To solve the problem, the inventor of the present invention has proposed a cutting machine that can be attached to the bucket of a backhoe (as disclosed in Japanese Patent Laid-Open Publication No. 1-207507).
However, since the cutting machine is fixed to the bucket, the cutting of the rotating cutter is limited to one direction. Thus, the user cannot freely select the cutting surface direction of the rotary cutter.
An object of the present invention is to provide a cutting machine that is disposed at an end of an arm of a backhoe or the like and that allows freely selecting the cutting surface angle of a rotary cutter.
SUMMARY OF THE INVENTION
The present invention is a cutting machine comprising a base means connected to an end of an arm with a pin, a cutter mounting means rotatable relative to the base means, and a rotary cutter means mounted on the cutter mounting means, wherein the cutter mounting means has a fixed portion and a movable portion, a moving means that extends and retracts in one direction being disposed on the fixed portion, a rotary cutter being disposed on the movable portion.
The cutting machine further comprises two angle setting means that mate with each other and that are disposed between the base means and the cutter mounting means, wherein the two angle setting means allow the cutting surface of the rotary cutter to be freely oriented.
The cutting machine further comprises a hydraulic motor disposed between the base means and the cutter mounting means, whereby the orientation of the cutting surface of the rotary cutter of the rotary cutter means relative to the base means is freely changed by controlling the rotation of the hydraulic motor.
The cutting machine further comprises a compression spring disposed between the base means and the cutter mounting means.
The cutter mounting means is composed of an outer cylinder means and an inner cylinder means. The inner cylinder means is fixed. The outer cylinder means is movable. An actuator is disposed between the outer cylinder means and the inner cylinder means. The outer cylinder means is moved by the actuator so that the rotary cutter is travels at a constant speed.
The actuator has a built-in hydraulic pump and is driven by a hydraulic circuit connected to an external device.
The cutting machine further comprises two angle setting plates that mate with each other and that are disposed between the base means and the rotary cutter mounting means. Corresponding to the angle that is set with the two angle setting plates, the surface of the rotating cutter is freely changed. The rotating cutter mounting means is composed of an outer cylinder means and an inner cylinder means. The inner cylinder means is fixed. The outer cylinder means is movable. An actuator is disposed between the inner cylinder means and the outer cylinder means. With the actuator, the outer cylinder means is moved so that the rotary cutter travels at a predetermined speed.
When necessary, the shaft can be rotated 30°, 45°, 90°, 120°, 180°, or the like to a reference position. The shaft can be fixed at the selected angle. At the set angle, the rotating cutter is moved in the axial direction so as to cut a concrete product/material or the like. Thus, the cutting machine according to the present invention allows the user to more safely perform a civil construction task than with a manual cutting machine. In addition, since the rotary cutter stably travels at a constant speed, an excessive load is not applied to the rotary cutter. Thus, the blade of the rotary cutter can be prevented from being broken.
REFERENCES:
patent: 1852387 (1932-04-01), Wieden
patent: 2011984 (1935-08-01), Rosenberger
patent: 2569291 (1951-09-01), Davis
patent: 2736311 (1956-02-01), Coates
Hail III Joseph J.
Lorusso & Loud
Wilson Lee
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