RU2796544C2 - Pipe cutter - Google Patents

Abstract

FIELD: metal processing.

SUBSTANCE: invention relates to the processing of metals by cutting, in particular to manual pipe cutters. The pipe cutter is made with an adjusting element and a counter support, which are formed on a C-shaped working head. The working head passes into the lower part used as a gripping area, and the installation element is placed with the possibility of moving relative to the lower part to change the opening width of the working head. The setting member can be secured to the lower portion by means of a locking device which has a manually actuated hook member cooperating with the receiving portion for locking. In order to increase handling convenience, it is proposed that the hook element be formed on the positioning element and be able to move with the positioning element relative to the receiving part.

EFFECT: provides ease of handling when manipulating with one hand.

10 cl, 9 dwg

Description

This invention relates to a pipe cutter with features of the restrictive part of paragraph 1, respectively, paragraph 2 of the claims.

From EP 1166927 A1 a device is known for removing the oxide layer from cylindrical objects. To do this, the cleaning (peeling) head is made enclosing the screw drive. For coarse adjustment, the snap lock must disengage from the spindle. From JP 2015-016544 A a pipe cutter is known, which, however, must be considered in relation to the setting element. This tuning element contains a screw drive. From GB 2333732 A an apparatus is known which can be designed both for cutting pipes and for removing the oxide layer from pipes. It is generally only C-shaped. Only the cutting tool itself can be rearranged.

Based on the prior art presented above, the present invention aims to provide a pipe cutter of the kind indicated at the outset, in particular having advantages in terms of ease of handling (handling).

This problem is solved primarily by the subject of independent claim 1 of the claims, and due to the fact that the hook element is formed on the installation element, and can also move with the installation element relative to the receiving part, and the installation element is held in the lower part in the groove guide with positive locking, however, with the possibility of movement, and this pipe cutter, regardless of the position of movement of the installation element, retains its external contour in terms of its length in the longitudinal extent and the transverse extent (extension in width) considered relative to it.

Further, this problem is solved by the subject of paragraph 2 of the claims, and due to the fact that the hook element is formed on the mounting element, and it can also move with the mounting element relative to the receiving part, and a trapezoidal cross-section of the teeth (toothed ring) is provided as a hook element , and the receiving part, respectively, of the external thread, as a result of which there is a overcome fixation in the direction of decreasing the width of the opening, while in the direction opposite to the direction of movement, overcoming is impossible due to the arrangement of the arms of the lever of the hook element.

Pipe cutters are known in particular from the field of plumbing installation and from the field of pipeline construction. With such a pipe cutter, it is advantageously possible to cut a section of pipe, for example mild steel, v2a stainless steel, cast iron, brass or thermoplastic polymer material, preferably without chipping, by means of a circular cut with at least one circumferential cutting knife. In this case, the active element can be a profiled wedge-shaped hardened cutting wheel, consisting, for example, of high-speed steel, if necessary, of hard alloy.

Further, in order to quickly or coarsely adjust the opening width, it is known to intentionally release the setting element from the normally locked state, for which purpose the hook element serving for fixing is released for manual operation.

Such a pipe cutter is known, for example, from US Pat. No. 3,100,934 A. The pipe cutter shown and described there has a coarse setting option for coarse adjustment of the opening width between the setting element and the counter support.

In view of the prior art described above, the technical problem is to improve the type of pipe cutter in question, in particular in terms of ease of handling.

According to the first inventive idea, one possible solution to the problem for the pipe cutter is proposed, which is oriented to the fact that the specified hooking element is made on the installation element and can move with this installation element relative to the receiving part.

As a result of the proposed implementation, convenient handling of the pipe cutter is ensured. The location of the hook element on the setting element allows the control (handling) of the pipe cutter with one hand also in the course of rearrangement, in particular, rough adjustment when releasing the fixation. This hooking element can be conveniently located, for example, it can be actuated by the thumb, and if necessary, which is also preferable, the positioning element can be actuated by means of the actuated hooking element for its preferential movement.

The movement of the setting element, which is also preferred, may be a linear sliding displacement.

When the fixation is released due to actuation of the hook element, this hook element can move together with the positioning element relative to the preferably fixed receiving part.

In addition, as a result of the proposed solutions, it is ensured that, regardless of the position of movement of the setting element relative to the working head, the external restrictions of the pipe cutter - for example, with reference to the projection of the pipe cutter on a plane perpendicular to the direction of movement of the setting element - are essentially not changed. Thus, in general, convenience in use (handling) of the pipe cutter is ensured, regardless of the position of movement of the installation element. Preferably, in this case, in any position of movement of the installation element, said hooking element can be conveniently accessed. Thus, by conventionally wrapping around the lower part of the pipe cutter according to one preferred embodiment, which is used as a gripping area, the setting element can be moved along the entire possible path of movement without the need for interception with a corresponding preferred actuation of the hook part with the thumb.

According to one preferred embodiment, the receptacle may be formed on a spindle portion fixed at the bottom with respect to movement in the direction of the longitudinal axis of the receptacle. For this, such a spindle part can, for example, have a profiling on the outside of the wall, for example in the form of an external thread, for cooperating with a corresponding mating profiling of the hook element.

In this case, the spindle part can also be installed pivotally around its longitudinal axis, which can be oriented in the same way as the longitudinal axis of the receiving part, in order to fine-tune the opening width. In particular, in connection with this, the receiving part interacting with the hooking element can be represented by an external thread made from the side surface of the spindle part. Accordingly, in the locking position, due to the rotational displacement of the spindle part around the longitudinal axis of this spindle part, a fine adjustment of the opening width can be made due to the fact that the setting element is shifted by means of a hook element engaged with the external thread of the spindle part.

To turn the spindle part on the lower part, for example, on the end side, facing away from the counterbearing, a handle can be provided. Due to the fact that the spindle part is fixed in the direction of the longitudinal axis of the receiving part and in the direction of the longitudinal axis of this spindle part in the lower part, according to one preferred embodiment, it is also possible to obtain a fixed arrangement of the handle acting on the spindle part, respectively, in this direction.

The positioning element can be held in the grip area and/or in the lower part in a form-fitting manner, however, in a movable manner. In this regard, a guide in the form of a slide or a groove can be provided for the installation element. Due to this, in particular, a linear movement of the adjusting element is allowed.

Also, this setting element can be placed with the possibility of movement between the stop on the working head and the stop on the bottom. The stop on the lower part can determine (which is also preferable) the maximum possible opening width of the working head. The stop on the working head can determine the smallest opening width, and the section of the working head that forms this stop, preferably interacting with the mounting element, facing away from the countersupport, can be made connected (coordinated) with the region of the working head that passes into the lower part.

Even greater ease of handling can be achieved in that said positioning element is pretensioned by means of a spring into a stop position on the lower part. Thus, due to this, the pre-stressing of the setting element in the direction of the largest opening width of the working head can be suitably set. The movement of the positioning element, in particular its shear movement to reduce the opening width, respectively, takes place against the return force of the spring.

As a result, the advantageous effect is achieved that the displaced setting element, after release of the fixation, due to actuation of the hook element, automatically moves back towards the position of the abutment on the lower part, or that this movement of the reverse movement, which is initiated by the user as a result of acting on the setting element, is supported by the force of the spring.

In particular, an easy-to-handle rapid movement of the positioning element in the direction of decreasing the opening width of the operating head can be ensured in that the locking in the direction of decreasing the opening width can be overcome. Thus, this rapid movement in the direction of decreasing the width of the opening can also take place without active release of the lock, only as a result of the corresponding actuation of the hooking element, due to the fact that, according to one embodiment, this positioning element alone is loaded in the sliding direction. Said hooking element for this purpose can be designed so that the area interacting with the receiving part allows passing through the said locking position in at least one direction of movement. This can be achieved by appropriately configuring, for example, the shape of the cross-section of the fixing elements of the hook part and/or the receiving part, in addition, if necessary, this can also be ensured only by an appropriate arrangement, for example, a rotary arrangement of the hook element on the setting element. .

In addition, said hook element may be pretensioned into said engagement position. To this end, a spring may be provided which presses on the engagement element in the direction of locking with the receiving part. The release of the fixation occurs as a result of the action on the hook element, in this case, respectively, with overcoming the force of the spring. When moving quickly, due to the transition through the fixation, the hook element also moves against the force of this spring.

According to one preferred embodiment, for example, a cutting element (which is also preferred) in the form of a cutting knife, in particular in the form of a hardened cutting disc, can be made on the positioning element, and the counterholder can be made on the fixed part of the working head. This counter-bearing may be formed by means of one or more guide rollers which, in the state of use, are in tangential contact with the pipe to be cut. Alternatively, said counterbearing may also be formed by one or more cutting elements.

In yet another alternative embodiment, this cutting element can be located on a counter-support, and the setting element can carry, for example, the above-described guide rollers.

Below the present invention is discussed in more detail with the help of the attached drawings, which illustrates only one example of implementation. The drawings show the following.

Fig. 1 is a perspective view of the type of pipe cutter in question, in the position of the maximum opening width of the working head;

Fig. 2 - its side view;

Fig. 3 - its rear view;

Fig. 4 - view of the pipe cutter from below;

Fig. 5 - pipe cutter, side view of FIG. 2 with a schematic representation of the cutting process;

Fig. 6 is a section along the line VI - VI in FIG. 4;

Fig. 7 is an enlarged view of area VII in FIG. 6;

Fig. 8 corresponding to FIG. 7 image, however, with the release of the fixation;

Fig. 9 corresponding to FIG. 6 is a sectional view, however, at a reduced size compared to FIG. 6 opening width of the working head.

Presented and described, first with reference to FIG. 1, pipe cutter 1 for cutting pieces of 2 pipes.

The pipe cutter 1 has primarily and essentially one C-shaped working head 3. One shelf of the C-shaped working head 3 forms a counter-bearing 4 located on the end side with respect to the entire pipe cutter 1, while the opposite shelf of the working head 3 essentially , is formed by the adjusting element 5 moved by the shift.

The jumper of the C-shaped head, connecting the said shelves, respectively, the counter-support 4 with the installation element 5, extends beyond the C-shape to create the lower part 7, which simultaneously forms the gripping area 6.

The C-clearance 8 obtained in the working head 3 forms a working area in which the pipe section 2 to be cut can be placed (cf. Fig. 6 and Fig. 9).

The specified shelf of the working head 3 together with the adjacent lower part 7 determines the longitudinal extent L of the pipe cutter 1, and the value of the longitudinal extent associated with this can be a multiple, for example, correspond to a double or triple transverse extent of the pipe cutter 1, considered across the longitudinal.

This positioning element 5 can move linearly, essentially in the direction of the longitudinal extent L on the lower part 7, respectively, on the grip area 6. For this, a guide 9 in the form of a slide or a groove can be provided (which is also preferable).

On the end side, which faces the gap 8, the positioning element 5 carries a cutting element 10 in the form of a cutting disc, preferably made of hard metal. The cutting element 10 is placed on the mounting element 5 with the possibility of free rotation around a rotary axis 11 oriented perpendicular to the direction r of movement of the mounting element 5 with the geometric axis x.

The cutting edge 12 of the cutting tool 10 passing around the x-axis in the form of a circle in any position of movement of the setting element 5 protrudes beyond the edge edge defining the specified gap 8 of the working head 3 into this gap 8.

The marginal edge of the working head 3 that defines the gap 8, as can be seen in the images, can be made in the form of a circular line.

In the direction r of movement opposite to the cutting element 10, in the shown embodiment, a plurality of guide rollers 13 are provided on the counter-bearing 4 formed fixed on the working head 3. In the shown embodiment, four such guide rollers 13 are installed. They can be made in the same way, each with a corresponding rotary axis 14 and a geometric axis y, which preferably run parallel to the rotary axis 11 with the geometric axis x of the cutting tool 10.

In particular, the geometric axes y of the guide rollers 13 can be located on a circular line with the center of the circle defined by the contour of the gap 8.

As can be seen in particular in the images of FIG. 6 and FIG. 7, between the cutting edge 12 of the cutting tool 10 and the surfaces of the guide rollers 13 facing them, which in the process of cutting are in contact essentially tangentially to the surface of the tubular part 2, an opening width w is obtained essentially corresponding to the diameter of the outer circumference of the tubular part to be cut. 2. This opening width w can change due to the movement of the setting element 5 with the cutting element 10.

In the lower part, in addition, the spindle part 15 is placed. Its geometric longitudinal axis z extends essentially in the direction of the longitudinal extent L, in addition, it is preferably oriented in the same direction as the direction of movement r of the installation element 5.

The spindle portion 15 at one end facing the working head 3 can be held in the cup-shaped hole 16 of the working head 3 in a rotatable manner. Accordingly, this spindle part 15 can be rotated about its longitudinal axis z, however, is fixed in the direction of the longitudinal extension L of the pipe cutter 1, respectively, in the direction of the longitudinal axis z.

The end of the spindle part 15, which is opposite to the end placed in the cup-shaped hole 16, can be led out through the end of the lower part facing away from the counter support 4. At this end, a rotary handle 17 can be connected to the spindle part 15 without the possibility of rotation. This rotary handle 17 serves as a handle for the rotary movement of the spindle part 15.

The specified spindle part 15 on the outside of the wall has an external thread 18, preferably of the trapezoidal thread type. This spindle part 15 can suitably be a lead screw.

The external thread 18 can serve as a receiving part 19 as part of the locking device 20. Another part of this locking device 20 can be a hook element 21.

The hook element 21 is first and essentially formed as a lever part, which is rotatably mounted about a rotary axis 22 with a geometrical axis u. This pivot pin 22 can (also preferably) be held in the positioning element 5, said hook element 21 being shiftable together with the positioning element 5 in the direction of movement r.

The specified geometric axis u (which is also preferable) can be oriented in the same way with the geometric axes x and y of the cutting element 10 and the guide rollers 13.

The hook element 21 forms the control (handling) end 23. It protrudes outward through the cutout 24 in the form of a window for the essentially flat control (handling) surface 25 of the mounting element 5.

Said control end 23, with respect to the lever portion of the hook element 21 facing away from the rotary axis 22, may have a section 26 provided with teeth, with a system of a plurality of hook protrusions 27, which, in relation to the longitudinal section, in which the longitudinal axis z is represented as a line, is transverse in its shape. sections and the distances between them are adjusted to the external thread 18 of the spindle part 15, respectively, to the receiving part 19 represented by it.

The toothed section 26, as viewed from the opening 8, can be arranged on the other side of the rotary axis 22, respectively, from the geometric axis u, while the associated control end 23, viewed from the opening 8, can be located in front of the rotary axis. 22.

Said hooking element 21 is pre-loaded into the hooking position according to FIG. 6 and FIG. 7. For this, as shown, a spring 28 can be provided, for example a coil spring, which rests with one end on the lower part 7 and with the other end on the lower side presses on the control end 23 of the hook element 21. Due to the resulting lever effect, provided with teeth section 26 is loaded in the direction of the engagement position with the receiving part 19, respectively, with the external thread 18.

Removing the engagement position is possible, respectively, only by pivoting the engagement element 21 against the force of the spring 28.

The setting element 5 can move between two stop positions, and one stop position, which determines the largest opening width w, can be set by the stop 29 on the lower part 7, and the setting element 5 can be pressed against this stop 29.

Another stop position can determine the smallest opening width w, if necessary, the opening width w can correspond to zero, and this stop position can be set by fitting the cutting edge 12 of the cutting tool 10 to the surface or surfaces of one or more guide rollers 13.

The setting element 5 can be spring-loaded in the direction of the stop 29, which determines the largest opening width w. For this, a spring 30 can be provided, for example, as shown, a cylindrical tension spring, which at one end is located on the lower part 7, and with the other end acts on the console 31 setting elements 5.

The movement of the setting element 5 in the direction r of movement to reduce the width w of the opening, respectively, occurs with overcoming the force of the spring 5, which, when the blocking action in the locking device 20 is released, presses the setting element 5 sequentially in the direction of the stop 29. Due to this, an almost automatic return movement can be ensured. setting element 5 after unlocking.

In this simple manner, a pipe cutter 1 is created which allows both fine adjustment and coarse adjustment of the opening width w. Fine tuning is carried out during the rotary actuation/bringing of the spindle part 15. The hooking element 21, which is engaged with it, due to the helical movement of the spindle part 15, performs a linear movement in the direction r of movement or opposite to the direction r of movement, and the opening width w can be changed due to engaging the setting element 5 in motion through the rotary axis 22 of the hook element 21.

This fine tuning is carried out, in particular, in the course of the schematic diagram shown in FIG. 5 of the cutting process, in which, due to the rotation of the entire pipe cutter 1 around the geometric axis v of the tubular part, this tubular part 2 is separated, and the cutting edge 12 of the cutting tool 10, rotating around the axis v, cuts into the material of the wall of the tubular part, and the cutting element 10 due to of the corresponding rotary displacement of the spindle part 15 by means of the rotary knob 17 progressively cuts further into the wall of the tubular part. Thus, the considered fine adjustment, respectively, the adjustment of the cutting tool 10 is carried out after each or after every second or third revolution of the pipe cutter 1 until the tubular part 2, respectively, its wall is cut completely.

The setting element 5 can move alone by means of the spindle part 15 over the entire possible travel path. However, in terms of ease of handling, it has turned out to be better to bring the setting element 5, in particular the cutting element 10, to the tubular part 2 to be cut off by coarse adjustment. The travel path required for this inevitably depends on the diameter of the tubular part 2 and on the initial position of the setting element 5.

Also, a coarse setting can be used for the return movement in the direction of the stop 29 located on the bottom side, which is also preferable.

To this end, the hook element 21 can be actuated in the region of the control end 23, whereby the interlock between the toothed section 26 and the receptacle 19 or the external thread 18 is released. this hook element 21 in action, for example, the thumb on the control surface 25, the specified installation element 5 with the cutting element 10 and with the hook element 21 is shifted along the guide 9 in the form of a groove in the direction r of movement or opposite to the direction r of movement. Upon completion of this movement and the cancellation of the action on the hook element 21, a locking position between the hook element 21 and the receiving part 19 is again obtained, from which further fine adjustment can be carried out due to the rotation of the spindle part 15.

Looking in the direction r of movement, i.e. in the direction of movement, which reduces the width w of the opening, then the section 26 of the hook element 21 provided with teeth is, as it were, involved in movement following the rotary axis 22 of the hook element 21. Due to the preferably trapezoidal cross-sectional shape of these teeth of both the hook element 21 and the receiving part 19, Accordingly, the external thread 18 can obtain a fixation overcome in the direction of decreasing the width w of the opening. So, to reduce the opening width w by rough installation, the installation element 5 can be moved without active loading of the hook element 21, only due to shear loading of the installation element 5 through its control surface 25.

In the direction opposite to the direction of movement r, such a transition is preferably not possible due to the arrangement of the lever arms of the hook element 21 .

As a result of the proposed implementation, a pipe cutter 1 is obtained, which can be operated in an advantageous manner with one hand, this is especially true with respect to the coarse setting, respectively, the shear displacement of the setting element 5.

Further, an advantage in handling is achieved in that the pipe cutter 1, irrespective of the movement position of the positioning element 5, retains its outer contour, in particular with respect to its length in the longitudinal extension L and its transverse extension (width extension) viewed transversely. This pipe cutter 1 can thus pass, respectively, in any position of the setting element within the remaining constant envelope surface of the imaginary sheath H that wraps around the pipe cutter 1. This pipe cutter 1 thus, preferably in any position of the setting element, requires the same working space around the detachable tubular parts.

List of reference positions

1 pipe cutter

2 tubular part

3 working head

4 counter support

5 setting element

6 capture area

7 bottom

8 hole

9 slot guide

10 cutting element

11 rotary axis

12 cutting edge

13 guide roller

14 rotary axis

15 spindle part

16 bowl hole

17 rotary knob

18 male thread

19 receiving part

20 locking device

21 hooks

22 rotary axis

23 control end

24 cutout

25 control surface

26 section with teeth

27 toe lug

28 spring

29 emphasis

30 spring

31 consoles

r direction of movement

u axis

v axis of the tubular part

w opening width

x axis

y axis

z longitudinal axis

H sheath

L longitudinal extent.

Claims (10)

1. A pipe cutter (1) with a setting element (5) and a counter support (4), which are formed on a C-shaped working head (3), and the specified working head (3) passes into the lower part (7) used as a gripping area ( 6), and the setting element (5) is movable relative to the lower part (7) to change the width (w) of the opening of the working head (3), and the specified setting element (5) with the help of the locking device (20), which has a driven manually actuated, the hook element (21), which interacts with the receiving part (19) for fixation, can be fixed on the lower part (7), characterized in that the said hook element (21) is formed on the mounting element (5) and is configured to movement with this setting element (5) relative to the receiving part (19), moreover, the specified setting element (5) in the lower part (7) is held in the groove guide (9) with positive locking, but with the possibility of movement, and moreover, the specified pipe cutter (1 ) irrespective of the movement position of the adjusting element (5) retains its outer contour in relation to its length in the longitudinal extent (L) and in its width in relation to it. 2. A pipe cutter (1) with a setting element (5) and a counter support (4), which are formed on a C-shaped working head (3), and the specified working head (3) passes into the lower part (7) used as a gripping area ( 6), and the setting element (5) is movable relative to the lower part (7) to change the width (w) of the opening of the working head (3), and the specified setting element (5) with the help of the locking device (20), which has a driven manually actuated, the hook element (21), which interacts with the receiving part (19) for fixation, can be fixed on the lower part (7), characterized in that the specified hook element (21) is formed on the mounting element (5) and is configured to movement with the adjusting element (5) relative to the receiving part (19), moreover, a trapezoidal cross-section of the teeth of both the hook element (21) and the receiving part (19), respectively, of the external thread (18) is provided, as a result of which the surmountable in the direction a decrease in the width (w) of the opening of the fixation, while in the direction opposite to the direction (r) of movement, overcoming is impossible due to the location of the arms of the lever of the hook element (21). 3. Pipe cutter according to claim. 1 or 2, characterized in that the receiving part (19) is formed on the spindle part (15), which is stationary in terms of movement in the direction of the longitudinal axis (z) of the receiving part (19) in the lower part (7) . 4. A pipe cutter according to claim 3, characterized in that the spindle part (15) is mounted rotatably around its longitudinal axis (z) to fine-tune the opening width (w). 5. Pipe cutter according to claim 2, characterized in that the positioning element (5) is held in the gripping area (6) in a form-fitting manner, however, with the possibility of movement. 6. Pipe cutter according to claim 1 or 4, characterized in that the setting element (5) is movable between the stop on the working head (3) and the stop (29) on the bottom. 7. A pipe cutter according to any one of the preceding claims, characterized in that the setting element (5) is pretensioned by means of a spring (29) into a stop position on the lower part (7). 8. Pipe cutter according to any one of the preceding claims, characterized in that the fixation can be overcome in the direction of decreasing the width (w) of the opening. 9. Pipe cutter according to any one of the preceding claims, characterized in that the hook element (21) is prestressed into the hook position. 10. A pipe cutter according to any of the preceding paragraphs, characterized in that a cutting element (10) is formed on the setting element (5), and the counter-support (4) is formed on the fixed part of the working head (3).

Images