RU221313U1 - Manual pipe clamp cutter - Google Patents

Abstract

The utility model relates to devices designed for cutting thin- and thick-walled pipes made of ordinary and stainless steel, as well as materials of less strength, in particular, manual clamp pipe cutters. A manual clamp pipe cutter contains a fork, pivotally connected in the lower part to the clamp and having the possibility of a quick-release connection with the clamp to form a rigid frame for moving the slider in it, on which stops are symmetrically fixed, ensuring a perpendicular position of the pipe cutter to the pipe axis; a handle is fixed in the upper part of the fork with the possibility of rotational-translational movement, and two cutting rollers are installed on the slider and the clamp on the axes. In this case, the clamp and the slider are additionally equipped with protrusions, and the axes of the cutting rollers at one end have transverse flat cuts that are in contact with these protrusions; at the other end, self-locking nuts are screwed onto the axle, while the quick-release connection of the fork with the clamp is made in the form of a detachable pin with a locking cotter pin. The technical result is a high degree of operational reliability, durability and maintainability of the pipe cutter. 1 salary f-ly, 5 ill.

Description

The utility model relates to devices designed for cutting thin-walled and thick-walled pipes made of ordinary and stainless steel, as well as materials of less strength, in particular, manual clamp pipe cutters.

Thanks to their design features, pipe clamp cutters can be used for cutting already installed pipes, as well as communications located in hard-to-reach places, in conditions of lack of space. Such a tool can be used underwater, in areas containing an explosive mixture in the air, in pits, and on pipe racks.

A hand-held pipe cutter is known in the art (US 2,865,098A, published 1958-12-23) including a central support member, first and second shafts attached to said member at a predetermined distance from each other, said first shaft being permanently secured and said the second shaft is removable, a threaded working screw with a handle attached at one end, several cutting rollers.

The known pipe cutter has an imperfect design and is not reliable in operation. When working with a pipe cutter, it is difficult to position it perpendicular to the direction of the cutting pipe.

A well-known four-roller pipe cutter with a clamp latch from Reed, USA (https://reed-m.ru) is the closest analogue. The pipe cutter contains a fork connected in the lower part with a clamp to form a rigid frame for moving a slider in it, on which stops are symmetrically fixed to ensure a perpendicular position of the pipe cutter to the pipe axis; in the upper part of the fork, a handle is fixed with the possibility of rotational-translational movement, on the slider and The clamp has two cutting rollers installed on the axles.

Thanks to four rollers, the cut is carried out in four places and the pipe cutter only needs to be rotated 90 degrees around the pipe axis. To secure the product, 100 mm of free space around the pipe is required. Powerful guides guarantee a precise cut.

However, the known pipe cutter does not have sufficient reliability in fixing the cutting rollers in the clamp and slider, as well as in the connection between the clamp and the fork.

The objective of the proposed utility model is to improve known designs to ensure more reliable operation of a pipe cutter.

This problem is solved by the fact that in a manual clamp pipe cutter containing a fork pivotally connected at the bottom to the clamp and having the ability to quickly connect to the clamp to form a rigid frame for moving a slider in it, on which stops are symmetrically fixed to ensure the perpendicular position of the pipe cutter to the axis pipes, a handle is fixed in the upper part of the fork with the possibility of rotational-translational movement, two cutting rollers are installed on the slider and the clamp on the axes, the clamp and the slider are additionally equipped with protrusions, and the axes of the cutting rollers at one end have transverse flat cuts that are in contact with the indicated protrusions, at the other end self-locking nuts are screwed onto the axle, while the quick-release connection of the fork with the clamp is made in the form of a detachable pin with a fixing cotter pin. The pipe cutter contains a chain connected on one side to a split pin ring, and on the other side attached to a fork.

The technical result is expressed in increasing the operational properties of the pipe cutter.

The design of the pipe cutter is illustrated by drawings.

In fig. 1 shows a cross-sectional view of a pipe cutter from the front;

in fig. 2 – side view;

in fig. 3 – section along A-A in Fig. 1;

in fig. 4 – section along B-B in Fig. 1;

in fig. 5 – view B.

The pipe cutter contains a fork 1, which in the lower part is hingedly connected to the clamp 2 using a bolt 3 with a self-locking nut 4, has the ability to quickly connect to the clamp using a detachable pin 5. The fork 1 and clamp 2 form a rigid frame for attaching and moving the slider 6 and screw (handle) 7. The handle 7 is fixed in the upper part of the fork 1 on a thread, and at its end, using a special groove, the slider 6 is fixed with through screws 8 and nuts 9, which prevents the free movement of the slider 6 along the fork 1, and the ball 10 ensures smoothness transmitting the rotational-translational movement of the handle 7 into the translational movement of the slider 6. The cutting rollers 11 are the working part of the pipe cutter. Two rollers 11 are installed on the slider 6 and two on the clamp 2 using axes 12 and secured with self-locking nuts 13. To reliably hold the axes 12, the cutting rollers have transverse flat cuts 14 at one end. There are welded projections on the clamp 2 and slider 6 ( plates) 15, into which the flat cuts of the axes 12 rest, ensuring the only correct position of the axes. At the other end, the axles 12 have a thread onto which self-locking nuts 13 are screwed, preventing longitudinal movement of the axes 12 and their unintentional loss during work. All axes 12 are the same and allow interchangeability both in one pipe cutter and within the same model of pipe cutters with each other. Stops 16, symmetrically located on the slider 6, are secured with bolts 17, which pass inside the springs 18 and are secured with nuts 19. Stops 16 ensure a perpendicular position of the pipe cutter to the pipe axis and take lateral loads during the work. The quick-release connection is made due to the exact coincidence of the holes in the lower part of the fork 1 and clamp 2, which are connected by means of a detachable pin 5, made of steel with higher strength characteristics than fork 1 and clamp 2, which eliminates the separable pin 5 from biting in the holes. From accidental removal, the split pin 5 is secured with a cotter pin 20, and the chain 21, which is welded on one side to the fork 1 and the other passes through the ring on the split pin 5, prevents accidental fall and loss during work.

The principle of operation of a pipe cutter is as follows.

After removing the cotter pin 20, the detachable pin 5 is removed from the pipe cutter frame by the ring. The clamp 2 with fork 1 is opened, the pipe cutter is placed on the pipe, closed again, the detachable pin 5 is installed in place and secured with a cotter pin 20. When the handle 7 is rotated clockwise, the slider 6 moves along the fork 1 until the cutting rollers 11 located on the clamp touch the pipe 2, and stops 16 located on the slider 6. When the stops 16 touch the pipe, the pipe cutter is perpendicular to the pipe axis. Deflecting the handle 7 of the pipe cutter from the initial position in different directions so that the total angle of deflection is at least 100 degrees, perform several cycles without twisting the handle 7. Then gradually tighten the handle 7 until all the cutting rollers 11 touch the pipe, while the stops 16 diverge on the springs 18. Having made sure that the cutting line formed on the pipe is smooth without breaks or distortions, rotate the handle no more than 1/4 turn, make three to four deflections and twist again, thereby deepening the cutting rollers 11 into the pipe and making a cut until the pipe is completely cut off.

The offered pipe cutter is reliable and easy to use. The inventive design achieves high performance properties of a pipe cutter, in particular, a high degree of operational reliability, durability and maintainability of the product.

Claims (2)

1. Manual clamp pipe cutter, containing a fork, pivotally connected at the bottom to the clamp and having the ability to quickly connect to the clamp to form a rigid frame for moving the slider in it, on which stops are symmetrically attached, ensuring a perpendicular position of the pipe cutter to the pipe axis, in the upper part the fork is secured with a handle with the possibility of rotational-translational movement, two cutting rollers are installed on the slider and the clamp on the axes, characterized in that the clamp and the slider are additionally equipped with protrusions, and the axes of the cutting rollers at one end have transverse flat cuts that are in contact with the said protrusions , at the other end, self-locking nuts are screwed onto the axle, while the quick-release connection of the fork with the clamp is made in the form of a detachable pin with a fixing cotter pin. 2. A pipe cutter according to claim 1, characterized in that it contains a chain connected on one side to a detachable pin ring, and on the other side attached to a fork.