JP4206345B2 - Pipe gripper - Google Patents

Description

  The present invention relates to a pipe gripping tool.

  Conventionally, a pipe wrench having a fixed jaw and a movable jaw that is slidable on a fixed jaw is known as a pipe gripping tool for gripping a pipe when a pipe joint is screwed into the pipe (for example, see Patent Document 1) ).

However, since the pipe gripping tool tightens the pipe from two directions, the pipe is distorted when the thin-walled pipe is gripped, and the pipe is easily damaged when used.
JP-A-8-19966

  The problem to be solved is that the pipe is distorted when a thin pipe is gripped, and the pipe is easily damaged when used.

In order to achieve the above-mentioned object, a pipe gripping tool according to the present invention has a gripping tool body having a first abutting portion and a second abutting portion and is slidable in the longitudinal direction on the gripping tool body. A sliding body attached to the first abutting portion and the second abutting portion, each of the first abutting portion and the second abutting portion being arranged so that two short rods are fixed with screws in parallel at a predetermined interval, and The gripper body and the slide body each have three attachment holes, and the short rod has a screw hole extending in a direction perpendicular to the axial center, and the screw is inserted into the attachment hole. It is configured to be inserted and screwed into the screw hole so that the predetermined interval can be changed, and further, a plurality of small convex portions are formed in each short circular rod, and the four short circular rods are formed on the outer peripheral surface of the pipe. The pipe is held while being pressed to prevent the pipe from rotating.

  According to the pipe gripping tool of the present invention, it is possible to prevent the pipe from being distorted when a thin pipe is gripped or from being damaged during use. Moreover, the pipe can be gripped strongly (to withstand a large rotational torque).

  1 and 2 show a use state of an embodiment of the present invention. That is, the pipe gripping tool H grips the pipe P when the pipe joint J is screwed into the pipe P and prevents the pipe P from rotating. In FIG. 1, the pipe joint J is rotated in the direction of the arrow R with the wrench W while the pipe P is gripped by the pipe gripper H, and the pipe joint J is screwed into the pipe P. At this time, since the torque T acts on the pipe P, a force in the direction of the arrow R ′ is applied to the pipe gripping tool H, and the pipe F is caused by a frictional force f between the short rod 4 and the pipe P, which will be described later. Prevent P from rotating.

  Specifically, as shown in FIG. 2, when the torque T is applied to the pipe P in the counterclockwise direction, the frictional force f acts on the pipe P in the clockwise tangent 4 direction. That is, the pipe P is prevented from rotating at four places (positions of the short bars 4).

  The pipe P is made of, for example, copper or stainless steel. The diameter D (outer diameter) of the pipe P is 6 mm ≦ D ≦ 60 mm. The wall thickness t of the thin copper pipe P is about 0.6 mm. The wall thickness t of the thin stainless steel pipe P is about 1.0 mm.

  The pipe gripping tool H includes a metal gripping tool body 3 having a first contact part 1 and a metal slide having a second contact part 2 and attached to the gripping tool body 3 so as to be slidable in the longitudinal direction. And a body 5. By sliding the slide body 5, the pipes P having various diameters D can be gripped. For example, in FIG. 2, a pipe P having a large diameter D (see FIG. 1) can be gripped as indicated by a solid line, and a pipe P having a small diameter D as indicated by a two-dot chain line can be gripped. Can have. Reference numeral 6 denotes a gripping part for gripping by hand.

  The pipe gripper H is configured to grip the pipe P by pressing the four metal (for example, quenched S55C) short rods 4 on the outer peripheral surface S of the pipe P. Specifically, two short rods 4 are fixed to the first abutting portion 1 and the second abutting portion 2 in parallel with a predetermined interval L by screws 8.

  Each short circular bar 4 is formed with a large number of small convex portions 7. Specifically, the small projections 7 are formed in an iris shape by knurling. The pitch p of the knurl processing is set to 0.4 mm ≦ p ≦ 1.5 mm. When p <0.4 mm, manufacturing takes time and labor. Further, when 1.5 mm <p, there is a drawback that when the pipe P is gripped and torque T is applied, the pipe P is slippery (the pipe P cannot be properly held).

The Rockwell hardness H _{RC of the} short bar 4 is set to 50 ≦ H _RC ≦ 65. If H _RC <50, the short bar 4 may be recessed during use. In the case of 65 < _HRC , it is difficult to perform the knurling process described above, and the cost becomes high.

  The predetermined interval L can be changed. That is, the gripping tool body 3 has mounting holes 9 through which screws 8 for fixing the short rod 4 are inserted at respective heights of upper, middle and lower, and the slide body 5 holds the short rod 4. A mounting hole 9 for fixing is provided at a position corresponding to each of the upper, middle, and lower heights. The short rod 4 has a screw hole 10 into which a screw 8 is screwed. FIGS. 1 and 2 show a state in which the short rod 4 is fixed by inserting screws 8 through the upper and lower mounting holes 9. FIG. 3 shows the upper mounting hole 9 and a state where the short rod 4 is fixed by inserting the screw 8 through the central mounting hole 9. In this case, the pipe P having a smaller diameter D (see FIG. 1) can be gripped.

  As shown in FIG. 2, the slide body 5 has a slide bar 12 having a male screw portion 11 on the distal end side. The slide bar 12 has a grip 13 on the base end side for rotating and sliding the slide bar 12. The tip of the slide bar 12 is rotatably attached to a block body 14 to which the short bar 4 is fixed.

  As shown in FIG. 4, the gripping tool main body 3 has two side plates 15 with a predetermined interval K. The block body 14 is connected to the slide plate 18 with a screw 17 through a cylindrical spacer 16. That is, the block body 14 is configured to be in sliding contact with the upper edge portion 15 a of the side plate 15, and the slide plate 18 is in sliding contact with the lower edge portion 15 b of the side plate 15.

  2, 5, and 6, reference numeral 19 denotes a regulating member that regulates the sliding of the slide body 5. The regulating member 19 is pivotally supported on the side plate 15. The restricting member 19 has a corrugated locking portion 20 that meshes with the male screw portion 11 of the slide bar 12. The restricting member 19 is elastically biased by a scissor spring 21 in a direction in which the corrugated locking portion 20 is pressed against the male screw portion 11 of the slide rod 12.

  The shape of the corrugated locking portion 20 is such that the slide body 5 slides only in the X direction in FIG. 2 when the male threaded portion 11 of the slide bar 12 and the corrugated locking portion 20 of the regulating member 19 are engaged. It is formed so that it cannot slide in the Y direction. If the grip 13 is pushed in the X direction, the slide body 5 can be quickly slid in the X direction. When the grip portion 13 is rotated in the direction C in FIG. 2, the slide body 5 can be slid little by little in the X direction (finely adjusted) by the engagement of the male screw portion 11 and the corrugated locking portion 20.

  In the state where the regulating member 19 is swung in the direction of arrow E and the corrugated locking portion 20 is separated from the male screw portion 11, the slide body 5 is quickly slid in both the X direction and the Y direction in FIG. Can be made.

  In the present invention, the design can be changed. For example, the small convex portion 7 may be formed on the short rod 4 in a flat shape by knurling. Further, the short bar 4 may be switchable in four steps in the height direction. That is, the number of mounting holes 9 may be increased or decreased.

  As described above, the present invention includes the four short rods 4 having a large number of small convex portions 7 pressed against the outer peripheral surface S of the pipe P, so that the pipe joint J is connected to the thin pipe P with a large torque. Even when screwing in T, it is possible to prevent the pipe P from being deformed. Further, even when a large torque T is applied to the pipe P, the frictional force as a whole is large, and the pipe P can be securely held without damaging the pipe P. Furthermore, since it does not unexpectedly leave the pipe P (even if the hand leaves for a moment), it is safe without dropping from a high place.

  In addition, a gripping tool body 3 having a first contact part 1 and a slide body 5 having a second contact part 2 and attached to the gripping tool body 3 so as to be slidable in the longitudinal direction are provided. Two short rods 4 are provided in parallel with each other at a predetermined interval L on the contact portion 1 and the second contact portion 2, and a plurality of small convex portions 7 are formed on each short rod 4. Since the pipe P is gripped by pressing the four short rods 4 on the outer peripheral surface S, one pipe gripper H is adapted to be used for pipes P of various diameters D. It is possible and convenient. Even when the pipe joint J is screwed into the thin pipe P with a large torque T, the pipe P can be prevented from being deformed. Further, even when a large torque T is applied to the pipe P, the frictional force as a whole is large, and the pipe P can be securely held without damaging the pipe P. Furthermore, since it does not unexpectedly leave the pipe P, it is safe without dropping from a high place.

  In addition, since the predetermined interval L can be changed, one pipe gripper H can be used by adapting to a pipe P having a wide range of diameters D, which is convenient.

It is a semi-cylindrical cross-sectional top view which shows the use condition of one Embodiment of this invention. It is a side view which shows a use condition. It is a side view which shows another use condition. It is a principal part sectional front view. It is a principal part expansion simplified front view. It is a principal part expansion simplified sectional side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st contact part 2 2nd contact part 3 Grasping tool main body 4 Short rod 5 Slide body 7 Small convex part L Predetermined space P Pipe S Outer peripheral surface

Claims (1)

A grip body (3) having a first contact portion (1) and a slide body (2) having a second contact portion (2) and slidably attached to the grip body (3) in the longitudinal direction. 5), and the first abutting portion (1) and the second abutting portion (2) are each screwed with two short bars (4) (4) in parallel with a predetermined interval (L). (8) It is disposed so as to be fixed at (8) , and each of the gripper body (3) and the slide body (5) has three mounting holes (9), (9) ( 9) and a screw hole (10) extending through the short rod (4) in a direction orthogonal to the axial center, and the screw (8) is inserted through the mounting hole (9). (10) is threaded to change the predetermined interval (L), and each short rod (4) is formed with a large number of small convex portions (7), and the outer periphery of the pipe (P). surface 4 of the short circular rod (S) (4) 4) (4) (4) in pressure contact with the pipe gripping device, characterized in that the pipe (P) is arranged to grip a pipe (P) while preventing the rotation.

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