GB2188576A

GB2188576A - Pipe cutter

Info

Publication number: GB2188576A
Application number: GB08608378A
Authority: GB
Inventors: Gaztanaga Jose Antonio Iriondo; Iriondo Fernando Errasti
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-02-12
Filing date: 1986-04-05
Publication date: 1987-10-07
Also published as: ES284550U; IT8523080A0; ES284550Y; GB8608378D0; FR2589771A1; DE3545138A1

Abstract

A pipe cutter, of the kind having arms 1, 2 jaws 3, 4 the jaw 3 being attached to the arm 1 and the jaw 4 being pivoted at 41, 42 on arms 1 and 2 respectively and a self-locking mechanism, is characterized by having, attached solidly to the double-pivoted jaw 4, the end of an articulated link chain 9 fitted with a cutting disc 93 upon each of its shaft pins 92 and because on the end of the jaw 3 there are hook shaped components 30 into which anyone of the cutter disc holding shaft pins 92 may be lodged in such a manner that when the chain is placed around a pipe and pulled tight to take up any gaps, and one of its cutter disc holder shafts is inserted into the hook shaped components, movement of the tool to and fro through a small arc will cut the pipe. <IMAGE>

Description

SPECIFICATION Pipe cutter This invention is concerned with an improved hand tool of the kind having two arms with two jaws, of which one is attached to one of the arms and the other is double-pivoted upon both, with a self-locking mechanism, and which is characterized because attached solidly to the double-pivoted jaw is the end of an articulated link chain fitted with a cutting disc upon each of its shaft pins.

It is also characterized because on the end ofthe fixed jaw there are some hook shaped components into which any one of the cutting disc holding shafts may be inserted.

It is moreover characterized because in the double-pivoted jaw there is a central slot which accommodates, when applicable, that portion ofthe chain which, when the pipe is embraced, lies beyond the shaftthat is engaged in the hook shaped components on the fixed jaw.

It is furthermore characterized because the self-locking mechanism is in particular comprised of a rod which is pivotally attached to the moving arm and rests upon the fixed arm, and a spring which connects said fixed arm to said double pivoted jaw all in such a mannerthat in the open position, the pivot between the rod and the moving arm is positioned above a straight line between said rest and jaw pivot and the moving arm, and therefore, due to the pull exerted by the spring, the moving jaw tends to open away from the fixed jaw, whilst in the closed position, the pivot between the rod and the moving arm is positioned either exactly in line with or is below the rest and the pivot between the jaw and the moving arm, and so the jaws tend to close.

It is in this way that with the above described arrangementthatwhenthechain is placed around a pipe and pulled tight to remove any gaps, and one of its cutter disc holder shafts is inserted into the hook shaped components, it is simply necessary to move the tool to and fro in a minimal rotary motion in order to accomplish a cut in the pipe.

This invention is especially suitable for purposes where pipes have to be cut when they are in poorly accessible positions in which conventional pipe cutters cannot be used due to the fact thatthey cannot reach right around the pipe ortheycannot be turned trough a particularly wide arc.

Figure 1 depicts an elevational view of a hand tool in accordance with the invention where it is in the self-locking closed position with the chain (9) embracing a pipe (T).

Figure2 is a plan view in section ofthe double-pivoted jaw or mouth (4).

The hand tool with which this invention is concerned comprises two arms (1), (2) and two jaws (3), (4).

One of these jaws (3) iseitherattachedat(F13), (F'13) to arm (1 ) or made all in one with said arm (1), which is also considered to be a fixed arm.

The other jaw (4), which is the travelling jaw, is double-pivoted at (41 ) to fixed arm (1) and at (42) to arm (2), which is considered to be a moving arm.

Fixed jaw (3) possesses at least one hooked shaped component (30) on its end.

Travelling jaw (4) possesses a slot (41) in its body, and a pivot (40) at its front end, by means of which chain (9) is at all times linked thereto.

This chain (9) is in turn comprised of: - a plurality of links (91) that are pivotally attached to one another by means of shaft pins (92).

- a plurality of cutter discs (93), of which one is assembled upon each shaft pin (92).

The self-locking mechanism between the arms is essentially comprised of: - a rod (5) that is pivotally attached at (51 ) to moving arm (2) and rests upon fixed arm (1), in a screw and nut arrangement (8), which allows itto be adjusted, - a spring (6) which is linked at (61)to the travelling jaw (4) and at (62) to fixed arm (1) itself, - a trigger (7), which is pivotally attached at (71 ) to moving arm (2) and provided with a stop (72) which enables unlocking to be accomplished by revolving the trigger (7) about pivot (71), whereupon it comes into abutment with rod (5) and makes arm (2) open and hence the whole tool is released.

With the aforegoing features, the improved hand tool with which this invention is concerned is able to work as a pipe cutter in poorly accessible locations.

To achieve this, it is simply necessary for chain (9) to be placed around the pipe (t) and pulled tight until a shaft pin (92) becomes lodged in the hook shaped components (30) on the fixed jaw (3), whereupon it is self-locked in that position by means of the above described self-locking mechanism.

Once it has been secured and the self-locking mechanism is applied, it is only necessaryto move the tool in a to and fro motion in orderfor each cutter disc (93) to make a cut into pipe (T) at one portion of its circumference, and for all cutter discs (93) working together, to cut right through the pipe with a minimal amountofangularmotion inthetool.

1. Pipe cutter of the kind having two arms, with two jaws, of which one is attached to one of said arms and the other is double-pivoted upon both, with a self-locking mechanism, and which is characterised in that attached solidlytothe double-pivoted jaw is the end of an articulated link chain fitted with a cutting disc upon each of its shaft pins, and in that on the end of the fixed jaw there are hook shaped components into which any one of the cutter disc holding shaft pins may be lodged in such a mannerthatwhenthechain is placed around a pipe and pulled tight to take up any gaps, and one of its cutter disc holder shafts is inserted into the hook shaped components, it is merely necessary to move the tool to and fro through a small arc in orderto accomplish a cut in the pipe.

2. Pipe cutter in accordance with the preceding claim and wherein there is a central slot in the double-pivoted jaw which accommodates that portion of the chain, if any, which, when the pipe is embraced, lies beyond the shaft that is engaged in the hookshaped components on thefixed jaw.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Pipe cutter This invention is concerned with an improved hand tool of the kind having two arms with two jaws, of which one is attached to one of the arms and the other is double-pivoted upon both, with a self-locking mechanism, and which is characterized because attached solidly to the double-pivoted jaw is the end of an articulated link chain fitted with a cutting disc upon each of its shaft pins. It is also characterized because on the end ofthe fixed jaw there are some hook shaped components into which any one of the cutting disc holding shafts may be inserted. It is moreover characterized because in the double-pivoted jaw there is a central slot which accommodates, when applicable, that portion ofthe chain which, when the pipe is embraced, lies beyond the shaftthat is engaged in the hook shaped components on the fixed jaw. It is furthermore characterized because the self-locking mechanism is in particular comprised of a rod which is pivotally attached to the moving arm and rests upon the fixed arm, and a spring which connects said fixed arm to said double pivoted jaw all in such a mannerthat in the open position, the pivot between the rod and the moving arm is positioned above a straight line between said rest and jaw pivot and the moving arm, and therefore, due to the pull exerted by the spring, the moving jaw tends to open away from the fixed jaw, whilst in the closed position, the pivot between the rod and the moving arm is positioned either exactly in line with or is below the rest and the pivot between the jaw and the moving arm, and so the jaws tend to close. It is in this way that with the above described arrangementthatwhenthechain is placed around a pipe and pulled tight to remove any gaps, and one of its cutter disc holder shafts is inserted into the hook shaped components, it is simply necessary to move the tool to and fro in a minimal rotary motion in order to accomplish a cut in the pipe. This invention is especially suitable for purposes where pipes have to be cut when they are in poorly accessible positions in which conventional pipe cutters cannot be used due to the fact thatthey cannot reach right around the pipe ortheycannot be turned trough a particularly wide arc. Figure 1 depicts an elevational view of a hand tool in accordance with the invention where it is in the self-locking closed position with the chain (9) embracing a pipe (T). Figure2 is a plan view in section ofthe double-pivoted jaw or mouth (4). The hand tool with which this invention is concerned comprises two arms (1), (2) and two jaws (3), (4). One of these jaws (3) iseitherattachedat(F13), (F'13) to arm (1 ) or made all in one with said arm (1), which is also considered to be a fixed arm. The other jaw (4), which is the travelling jaw, is double-pivoted at (41 ) to fixed arm (1) and at (42) to arm (2), which is considered to be a moving arm. Fixed jaw (3) possesses at least one hooked shaped component (30) on its end. Travelling jaw (4) possesses a slot (41) in its body, and a pivot (40) at its front end, by means of which chain (9) is at all times linked thereto. This chain (9) is in turn comprised of: - a plurality of links (91) that are pivotally attached to one another by means of shaft pins (92). - a plurality of cutter discs (93), of which one is assembled upon each shaft pin (92). The self-locking mechanism between the arms is essentially comprised of: - a rod (5) that is pivotally attached at (51 ) to moving arm (2) and rests upon fixed arm (1), in a screw and nut arrangement (8), which allows itto be adjusted, - a spring (6) which is linked at (61)to the travelling jaw (4) and at (62) to fixed arm (1) itself, - a trigger (7), which is pivotally attached at (71 ) to moving arm (2) and provided with a stop (72) which enables unlocking to be accomplished by revolving the trigger (7) about pivot (71), whereupon it comes into abutment with rod (5) and makes arm (2) open and hence the whole tool is released. With the aforegoing features, the improved hand tool with which this invention is concerned is able to work as a pipe cutter in poorly accessible locations. To achieve this, it is simply necessary for chain (9) to be placed around the pipe (t) and pulled tight until a shaft pin (92) becomes lodged in the hook shaped components (30) on the fixed jaw (3), whereupon it is self-locked in that position by means of the above described self-locking mechanism. Once it has been secured and the self-locking mechanism is applied, it is only necessaryto move the tool in a to and fro motion in orderfor each cutter disc (93) to make a cut into pipe (T) at one portion of its circumference, and for all cutter discs (93) working together, to cut right through the pipe with a minimal amountofangularmotion inthetool. CLAIMS

3. Pipecutterin accordancewith claim 1 or2 whereintheself-locking mechanism is in particular comprised of a rod which is pivotally attached to the moving arm and rests upon the fixed arm, and a spring which connects said fixed arm to said double pivottedjawall in such a mannerthatintheopen position, the pivot between the rod and the moving arm is positioned above a straight line between said rest and jaw pivot and the moving arm, and therefore, due to the pull exerted by the spring, the movingjawtendsto open awayfromthefixedjaw, whilst in the closed position, the pivot between the rod and the moving arm is positioned either exactly in line with or is below the rest and the pivot between the jaw and the moving arm, and so the jaws tend to close.

4. A pipe cuttersubstantially as herein described with reference to the accompanying drawings.