JP7029117B2 - Pipe bender for plumbing - Google Patents

Description

The present invention relates to a pipe bender for piping.

As a pipe bender for electrical conduit piping, Patent Document 1 describes a handle, a bender head plate provided at one end of the handle in the direction of the handle axis, and a pipe projecting vertically from one side of the bender head plate. It has been proposed to have a set of projectiles that are staggered from both sides.

Further, Patent Document 2 proposes a method of reading the bending angle of a pipe bent along a bending member in which the bending angle is engraved by using a magnifying lens.

Jitsukai Sho 56-7422 Gazette Jikkenhei 4-54513 Gazette

In the case of Patent Document 1, it is possible to perform bending while changing the bending ratio of the electric wire pipe according to the piping application, but since the bending ratio of the electric wire pipe is bent according to the scale, it is bent. The angle tends to lack accuracy.
On the other hand, in the case of Patent Document 2, since the bending angle is engraved on the bending member, the bending angle is accurate, but it is necessary to prepare the bending member individually according to the diameter of the pipe , and the pipe . When the diameter is small , the curved member becomes small, it becomes difficult to read the engraved bending angle, and it tends to lack accuracy.

The present invention is for solving the above-mentioned problems, and is necessary even if the bending ratio is changed or the bending ratio is particularly large while measuring the bending angle reliably and accurately without the need for an individual bending member. It provides a pipe bender for piping that can be bent at an angle of radius of curvature.

In order to solve the above problems, the pipe bender for piping according to the present invention is bent by projecting from one surface of the handle, the bender head plate provided at the end of the handle, and the bender head plate. For pipes that are composed of a pair of projecting bodies that sandwich the pipe to be machined from above and below with a predetermined interval, and perform a predetermined bending process by sandwiching the pipe in the projecting body and applying pressure to the pipe. The pipe bender has a fan-shaped plate-like shape in which the center of rotation is rotatably attached to the other surface of the bender head plate, and a scale indicating the rotation angle is provided on the outer peripheral side thereof. The rotary scale is provided on the outer peripheral side of the fan-shaped rotary scale, and the rotary scale rotates about the center of rotation in synchronization with the movement of the pipe due to the bending process of the pipe sandwiched between the projectiles. A hook portion for holding the pipe, an angle indicating portion provided on the handle corresponding to the position of the scale provided on the rotation scale, and an angle indicating portion for reading a change in the rotation angle of the rotation scale. It is characterized by being composed of more.

Further, the angle indicating portion of the pipe bender for piping according to the present invention is characterized in that the outer peripheral end portion of the rotary scale is sandwiched between the handle and the handle.

Further, the pipe bender for piping according to the present invention further has an arcuate slit hole provided so as to be concentric with the fan shape inside the scale indicating the rotation angle provided on the outer side of the rotation scale. The hook portion is characterized in that it is fixed to a predetermined position of the arc-shaped slit hole via an adjusting screw.

Further, the pipe bender for piping according to the present invention stops the bending process so that the angle corresponding to the target angle of the bending process of the pipe can be set between the angle indicator and the bending process of the pipe. The bending stop instruction portion for instructing the angle for the pipe is configured to be selectively attached to a predetermined angle position of the arc-shaped slit hole, and the rotation scale rotates with the bending process of the pipe so that the bending stop instruction portion is the said. It is characterized in that the target angle for bending of the pipe can be determined by matching with the angle indicator.

The pipe bender for piping of the present invention bends a rotary scale having a rotation center rotatably attached to a bender head plate when bending is performed by sandwiching a pipe between a pair of projecting bodies provided at the end of a handle. The first feature is that a hook portion for holding the pipe for rotating the pipe in synchronization with the movement of the pipe due to processing is provided, and an angle indicating portion for reading the scale provided on the rotation scale is provided on the handle. It is a thing. With this configuration, it is possible to rotate the rotary scale in synchronization with the movement of the pipe, the rotary scale does not get in the way during bending, and the scale provided on the rotary scale by the angle indicator is provided. It is possible to accurately discriminate the change in the angle of the pipe, and it is possible to perform the bending process of the pipe accurately.

Further, since the angle indicating portion of the pipe bender for piping according to the present invention holds the outer peripheral end portion of the rotary scale sandwiched between the handle and the handle, the rotary scale rotates stably without wobbling. It will be possible.

Further, the rotary scale according to the present invention has an arcuate slit hole, and the hook portion is fixed to a predetermined position of the slit hole via an adjusting screw, so that the hook portion and the rotary scale are positioned. The relationship can be adjusted, and it can be installed so as not to affect workability. In addition, the positional relationship between the angle indicator provided on the handle and the scale can be arbitrarily adjusted, increasing the degree of freedom for the user to confirm the rotation angle.

Further, in the present invention, a bending stop instruction portion is provided for the slit hole provided in the rotary scale. Before the start of bending, this bending stop indicator can indicate the angle actually required for bending with the angle indicator, so it is possible to easily confirm the required angle for bending. I can.

The schematic perspective view of the pipe bender for piping of this invention is shown. A method of bending a pipe using the pipe bender for piping of the present invention is shown. A method of bending a pipe using the pipe bender for piping of the present invention is shown. A method of bending a pipe with the bender head plate of the pipe bender for piping of the present invention on the ground side is shown.

The handle of the present invention is a rod-shaped body that is fixed to one end of the following bender head plate and extends in the vertical direction, and may be hollow for weight reduction, and has a diameter that can be grasped by hand.
Specifically, steel pipes and the like can be used.

The bender head plate of the present invention has a plate shape provided at one end of the handle, and may be integrated with the handle or a separate member. The pipe is bent at this part.

The projecting body of the present invention refers to a portion of a bender head plate projecting vertically from one side or another member, and a set of pipes sandwiched between the side surfaces of the bender head plate.

The rotary scale of the present invention has an angle scale provided on the surface of a fan - shaped plate, and the radius of the fan shape is such that the above-mentioned angle scale interval is easy to see, and is approximately 5 cm to 20 cm. The central angle of is preferably about 40 to 180 degrees. A transparent plate facilitates bending work.

In the hook portion of the present invention, one end portion is in contact with the side surface of the pipe to hook the pipe, and the other end portion is in contact with the rotary scale. When fixed at the portion in contact with the rotary scale, the hook portion and the rotary scale rotate integrally.
The side in contact with the rotation scale extends to the central portion of rotation of the rotation scale, and by making it the same axis as the rotation axis of the rotation scale, the pipe, the rotation scale, and the hook portion rotate on the same axis.

The free rotation prevention mechanism of the present invention suppresses the free rotation of the rotation scale, and a mechanism having a high friction coefficient is provided so as to fill the gap between the rotation scale and the handle or the bender head, and manually or the like. It is possible to generate enough rotational friction to move the rotational scale. Specifically, a single-sided felt adhesive tape or the like can be used.

The rotary scale stopper of the present invention is for preventing the rotary scale from coming off to the outside, and is installed by sewing the front and back with a pan head screw and a nut.

The angle indicator of the present invention indicates the angle of the angle scale of the rotation scale and is attached to the handle. One end is fixed to the surface of the handle and the other end indicates the angle of the rotary scale.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic perspective view of a pipe bender for piping of the present invention.
The pipe bender for piping of the present invention is provided with a handle 1 and a bender head plate 2 in the direction of the handle axis at the upper end of the handle 1, and a pipe is projected vertically from one side of the bender head plate 2. A set of projecting bodies 3 sandwiched from both sides and a rotation scale 4 rotating about the bent portion of the pipe as an axis are provided on the opposite surface of the projecting body 3 in parallel with the opposite surface.
The rotation scale 4 is a fan -shaped plate, and an angle scale 4a of a rotation angle is provided on the surface thereof by printing or the like.

Further, as shown in the figure, the rotation scale 4 has an arc shape provided concentrically with the fan shape inside the angle scale 4a provided on the outer side of the rotation scale 4 to represent the rotation angle. A slit hole 12 is provided.
Then, when the hook portion 5 for hooking the pipe is attached to the slit hole 12 and fixed with the hook adjusting screw 5a or the like, the hook portion 5 rotates integrally.
The hook portion 5 has a crescent-shaped sandwiching portion 5b on the side to be hooked along the side surface of the pipe, and the side in contact with the rotation scale 4 on the opposite side is extended to the center portion of rotation of the rotation scale 4. By setting the same axis as the rotation axis 6 of the rotation scale, the pipe, the rotation scale 4, and the hook portion 5 rotate on the same axis.

Further, on the arc side of the rotary scale 4, an angle indicating portion 7 indicating the angle of the angle scale of the rotary scale 4 is attached to the handle 1. One end is fixed to the surface of the handle 1, and the other end indicates the angle of the angle scale of the rotary scale 4.

Further, in order to prevent the free rotation of the rotation scale 4, the free rotation prevention mechanism 8 is provided in the gap between the angle indicating portion 7 and the rotation scale 4.
Further, in order to set the bending angle of the pipe once, the bending stop instruction portion 9 is provided radially on the rotation shaft 7 on the surface of the rotation scale 4. According to the setting, the rotation scale 4 is screwed to the slit hole 12 with a bending stop screw 9a or the like.

2 and 3 show a method of bending a pipe using the pipe bender for piping of the present invention.
2 (a) is before bending, FIG. 2 (b) is after the first bending, FIG. 3 (a) is before the next bending, and FIG. 3 (b) is after the next bending, FIG. 3 (c). Indicates after bending is completed.

First, put the handle on the ground. As a bending procedure when the pipe 10 is moved by 10 degrees and bent multiple times,
First, as shown in FIG. 2A, the 0 point of the rotation scale 4 (“10 scales” as the angle scale 4a) is aligned with the designated point of the angle indicating unit 7 provided on the handle 1.
Next, loosen the hook adjusting screw 5a.
Next, the pipe 10 is sandwiched between a set of protrusions 3 of a pipe bender for piping.
Next, the pipe 10 is hooked to the sandwiched portion 5b of the hook portion 5.
Next, the hook adjusting screw 5a is tightened to fix the rotary scale 4 and the hook portion 5.
Next, the bending stop indicating portion 9 is fixed to the rotary scale 4 via the slit hole 12 by using the bending stop screw 9a so that the pipe bending angle required for the first time is obtained.
(In this case, the pipe bending angle required for the first time is 12 degrees, and the angle scale 4a of the bending stop instruction portion 9 is fixed to the slit hole 12 so as to be "20 scales".)

Next, as shown in FIG. 2B, the pipe 10 on the hook portion 5 and the handle 1 are narrowed so that the designated point of the angle indicating portion 7 and the bending stop angle of the bending stop indicating portion 9 match. Bend the pipe to do so.

Next, as shown in FIG. 3A, the pipe 10 is moved to the next bending point.
(At this time, the pipe 10, the rotation scale 4, and the hook portion 5 rotate and return to their original positions.)
Next, as shown in FIG. 3B, the designated point of the angle indicating portion 7 and the bending stop angle of the bending stop indicating portion 9 coincide with each other so that the pipe 10 and the handle 1 of the hook portion 5 are narrowed. Bend the pipe so that.
After repeating the above a plurality of times, bending is completed as shown in FIG. 3 (c).

FIG. 4 shows a method of bending a pipe with the bender head plate of the pipe bender on the ground side.
Place the pipe 10 on the ground, check the 0 point of the rotation scale 4, make other adjustments in the same manner as in the previous section, pull the handle 1 toward you, and bend the pipe 10.
Since the rotary scale 4 is provided on the handle side, the pipe 10 can be placed on the ground, and since it is not necessary to hold the pipe 10, it is possible to concentrate on bending. You can work safely even when the pipe 10 is long.

1 ... Handle, 2 ... Bender head plate, 3 ... Projection body, 4 ... Rotation scale, 4a ... Angle scale, 5 ... Hook part, 5a ... Hook adjustment screw, 5b ... Sandwiched part, 6 ... Rotation scale rotation shaft , 7 ... Angle indicator, 8 ... Free rotation prevention mechanism, 9 ... Bending stop indicator , 9a ... Bending stop screw , 10 ... Pipe, 11 ... Rotation scale decoupling, 12 ... Slit hole

Claims (4)

A pair of protrusions that project from one surface of the handle, the bender head plate provided at the end of the handle, and the bender head plate, and sandwich the pipe to be bent from the vertical direction at a predetermined interval. It is a pipe bender for piping that is composed of a body and performs a predetermined bending process by sandwiching a pipe in the projecting body and applying pressure to the pipe itself.
A rotation scale having a fan-shaped plate-like shape in which the center of rotation is rotatably attached to the other surface of the vendor head plate, and a scale indicating the rotation angle is provided on the outer peripheral side thereof.
The rotation scale is provided on the outer peripheral side of the fan-shaped rotation scale so that the rotation scale rotates about the rotation center portion in synchronization with the movement of the pipe due to the bending process of the pipe sandwiched between the protrusions. The hook part that holds the pipe and
An angle indicator provided on the handle corresponding to the position of the scale provided on the rotation scale and for reading a change in the rotation angle of the rotation scale.
A pipe bender for piping, which is characterized by being composed of more. The pipe bender for piping according to claim 1, wherein the angle indicating portion sandwiches an outer peripheral end portion of the rotary scale between the handle and the handle. Inside the scale representing the rotation angle provided on the outer side of the rotation scale, an arc-shaped slit hole provided so as to be concentric with the fan shape is further provided, and the hook portion has the arc-shaped slit. The pipe bender for piping according to claim 1, wherein the hole is fixed at a predetermined position via an adjusting screw. When bending a pipe, the bending stop instruction section that indicates the angle for stopping the bending process is provided so that the angle corresponding to the target angle of the bending process of the pipe can be set between the angle indicator and the angle indicator. It is configured to be selectively mountable at a predetermined angle position of the arcuate slit hole.
The pipe according to claim 3, wherein the rotation scale rotates together with the bending of the pipe, and the bending stop indicating portion coincides with the angle indicating portion, so that the target angle of the bending processing of the pipe can be determined. For pipe benders.

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