Cutlery – Pipe and rod cutters – Rotary
Patent
1996-11-13
1999-05-18
Payer, Hwei-Siu
Cutlery
Pipe and rod cutters
Rotary
30102, B23D21/08
Patent
active
059039809
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a hand tool for cutting pipe, particularly copper pipe such as that used in central-heating installations. As used herein, `cutting` includes providing a circumferential groove in the pipe.
2. Prior Art
Various forms of hand tools for cutting pipe are known, such pipe cutters generally having a rotatably mounted cutting wheel for engaging, in use, one side of the pipe, which is supported at its opposite side by a pair of spaced rollers.
In one form, the pipe cutter is adjustable to enable a range of different diameter pipes to be cut. This is accomplished by providing screw or other means for effecting relative adjustment movement between the cutting wheel and the rollers. Once a size of pipe is clamped tightly between the cutting wheel and the rollers, cutting is carried out by relative rotation between the tool and the pipe, normally by rotating the tool around a fixed pipe. PCT Specification No. WO90/05610 shows adjustable pipe cutters of this form, one of which has the cutting wheel axle fixed in one body part which is hinged to a second body part. The two body parts are urged together by a strong compression spring acting between them.
European Patent specification No. 0204802 B discloses a further form of pipe cutter designed for cutting a particular size of pipe. The device has a rotatable cutting wheel mounted on a shaft which is movable in one direction along an arcuate track when a pipe is inserted into a central hole of the device through an entry slot. After insertion the wheel snaps forward so that the pipe is held in engagement with a pair of spaced rollers at one of its sides, and with the cutting wheel at its opposite side. Thereafter relative rotation in one direction between the tool and the pipe causes the wheel to rotate and bite into the pipe as the cutting wheel shaft rotates and moves along the arcuate track in the opposite direction to its movement on pipe insertion. During such movement, the shaft presses against, and is pressed inwards by, strip springs which define part of the arcuate track. Continued relative rotation effects cutting of the pipe. Whilst this cutter is generally satisfactory in use, it is relatively expensive to produce.
SUMMARY OF THE INVENTION
An object of the invention is to provide an improved hand tool for cutting pipe.
According to a first aspect of the present invention, a hand tool for cutting pipe comprises a body having first and second body parts relatively movable together and apart, pipe support means for supporting a pipe to be cut, in use, upon relative rotation between the body and the pipe about the pipe longitudinal axis, a circular cutter arranged, in use, at right angles to said pipe longitudinal axis, and rotatable by frictional contact of its edge with the pipe, and energy storage means associated with one of the body parts, the arrangement being such that, in use, with the pipe to be cut engaging said pipe support means, relative movement together of said first and second body parts charges said energy storage means so as urge the pipe support means and the cutter relatively towards each other, whereby the pipe is severed by the cutter edge as said relative rotation occurs.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic side view of a first embodiment of a hand tool of the invention, with one side of a body part of the tool removed for clarity;
FIGS. 2 and 3 are perspective views of a cutter carrier and a casing respectively of the hand tool of FIG. 1;
FIGS. 4, 5 and 6 are respective interior sectional side views of a second embodiment of a hand tool of the invention, FIG. 4 showing the tool open prior to pipe insertion, FIG. 5 showing a pipe inserted and the tool partly closed, and FIG. 6 showing the tool closed with the pipe located therein reading for cutting;
FIG. 7 is an end view corresponding to FIG. 6;
FIG. 8 to 10 are respective
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Collier John Arthur
Potter Laurence John
Monument Tools Ltd.
Payer Hwei-Siu
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