JPS6239854Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for bending large-diameter metal pipes, and in particular to a pipe bender that is installed on a workbench such as a vise and can generate a large amount of bending stress by hand. Regarding.

For example, in automobile repair shops and the like, it is necessary to bend metal pipes attached to the bumpers of large trucks. The diameter of such metal pipes often exceeds 20 millimeters, so it is impossible to construct them using normal human power.

Therefore, in order to suitably bend these large-diameter metal pipes, various hydraulic application equipment and hot working equipment have been developed.

However, these conventional devices have complicated mechanisms and require heat and power sources, making them uneconomical and impractical.

The present invention was created in view of the above-mentioned problems and provides an advanced pipe bender.The purpose of this invention is to bend large diameter metal pipes beautifully and accurately by hand and cold without the need for hydraulic equipment or heat sources. The purpose is to be able to bend it.

To this end, the pipe bender according to the present invention fixes the abutting tube and the winding roller on a support substrate, and also fixes the bending roller on a rotary plate that rotates coaxially with the winding roller. A small-diameter pinion having a handle is mounted on a rotary plate, and this small-diameter pinion is meshed with a large-diameter gear coaxially fixed to a winding roller to cause planetary motion so that the pipe material is centered around the winding roller. The bending process is performed using an abutment tube and a bending roller.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall perspective view showing an embodiment of a pipe bender according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a vertical sectional view taken along the line -- of FIG. 2.

1 indicates a flat support substrate;
A grip plate 3 is provided at the center of the lower surface so that it can be attached to a workbench 2 such as a vise.

An abutment tube 4 is provided upright at the end of the support substrate 1. This abutting tube 4 is a rod-shaped body having a step, and comes into contact with the outer periphery of one end of the pipe material 5 to receive the bending stress applied to the pipe material 5. Note that the position of the abutting tube 4 does not change during the bending process.

6 indicates a winding roller, and the winding roller 6
has a diameter determined according to the bending radius of the pipe material 5, and is fixed on the support substrate 1 in a stacked state on the intermediate collar 7 at a position spaced apart from the abutment tube 4.

That is, the winding roller 6, the intermediate collar 7, and the support substrate 1 are integrally fixed to the support substrate 1 with a mounting bolt 8, and do not move during the bending process. The winding roller 6 has a plurality of vertically striped grooves 9 on its outer periphery (the depth and width of each groove vary depending on the pipe material 5), and the pipe material 5 is inserted into these grooves 9. By fitting the bent portions, it becomes a guide for the bending process, and the pipe material 5 is bent to a diameter along the groove 9.

A large-diameter gear 10 is integrally fixed to the support substrate 1 by a pin 11, located on the outer periphery of the intermediate collar 7 on the upper surface of the support substrate 1, coaxially with the winding roller 6 and the shaft 8. The large-diameter gear 10 meshes with a small-diameter pinion 13 of a drive means 12, which will be described later, to constitute a force increasing mechanism.

Similarly, a rotary plate 14 is provided rotatably on the outer periphery of the intermediate collar 7 between the winding roller 6 and the large-diameter gear 10 so that the center is the same as that of the winding roller 6 by the intermediate collar 7. This rotary plate 14 is connected to the winding roller 6 as shown in FIG.
A bending roller 15 and a driving means 12 are respectively provided on these protruding parts so as to rotate together with the rotary plate 14 about the intermediate collar 7.

That is, the bending roller 15 is the wrapping roller 6
As shown in the side view of FIG. 4, a plurality of grooves 9 of the winding roller 6 are fixed vertically on the rotating plate 14 and are spaced apart from each other and correspond to the grooves 9 of the winding roller 6 for receiving and bending the other end of the pipe material 5, as shown in the side view of FIG. It has a groove 16 on the outer periphery. The depth and width of these grooves 16 are also determined according to the diameter of the pipe material 5, similar to the grooves 9 of the winding roller 6.

Further, the rotating plate 14 is placed on the rotating plate 14 apart from the protruding portion to which the bending roller 15 is vertically fixed.
A driving means 12 is provided for rotating the collar around the intermediate collar 7 to perform the bending process.
That is, the bearing tube 17 is erected on the rotating plate 14,
A handle 19 is provided at the upper end of the shaft 18 which is rotatably fitted into the bearing sleeve 17, and rotational force is applied to the shaft 18 by turning the handle 19 with input.

A small diameter pinion 13 that meshes with the large diameter gear 10 is fixed to the lower end of the shaft 18. When the handle 19 is turned and the shaft 18 is rotated, the small diameter pinion 13 rolls on the outer periphery of the large diameter gear 10. The rotary plate 14 and the bending roller 15 integral therewith are rotated about the intermediate collar 7. The gear ratio between the small-diameter pinion 13 and the large-diameter gear 10 and the arm length of the handle 19 are determined in consideration of the bending rigidity of the pipe material 5.

Next, the effects of the above embodiment will be explained. As shown in FIG. The handle 19 of the drive means 12 is rotated clockwise by input (the second (Fig. 5).

Then, the small diameter pinion 13 at the other end of the shaft 18 connects to the large diameter gear 1 coaxial with the winding roller 6.
0 in a planetary manner and rotates clockwise (FIGS. 2 and 5), and as a result, the rotating plate 14 to which the bearing sleeve 17 is fixed rotates clockwise. As a result, the groove 16 of the bending roller 15 on the rotary plate 14 fits into the outer periphery of the pipe material 5, and the bending process is started.

If you continue to turn the handle 19 further, the rotating plate 14
The bending roller 15 rotates around the winding roller 6, and while the winding roller 6 is set at the standard bending position, the bending moment is received by the abutting cylinder 4 and the bending roller 15, as shown in the plan view of FIG. The bending operation of the large-diameter metal pipe material 5 is performed in this manner.

As described above, in the present invention, by providing the grip plate 3 on the support substrate 1, the present device can be easily fixed to a vise or other tools. The outer peripheral surfaces of both ends of the pipe material 5 are fitted into the inner peripheral surfaces of the bending rollers 15 protruding from the cylinder 4 and the rotary plate 14, and the bending portion of the pipe material 5 is fitted into the grooves 9 of the winding roller 6 for processing. Therefore, handling of the pipe material 5 is extremely easy, and by turning the handle 19, the bending roller 15 is rotated together with the rotary plate 14, and the pipe material 5 can be curved along the outer peripheral surface of the winding roller 6. Furthermore, the winding roller 6 can be prepared with bending rollers having different outer shapes depending on the outer diameter and bending radius of the pipe material 5, and can be used by replacing them on the shaft 8, which is extremely convenient. Further, the large diameter gear 10 is fixed on the support substrate 1 with the intermediate collar 7 and the pin 11, and the large diameter gear 10
A rotary plate 1 rotating around an intermediate collar 7 at the top
4, the height of the device can be made low and the pinion 13 and rotating plate 14 can be rotated smoothly. In addition, pipe material can be cold bent with a small amount of human power without requiring conventional hydraulic equipment or heating sources, and pipe processing can be performed in small-scale businesses without the need for special skill. It can be carried out. Moreover, large diameter gear 1
By appropriately setting the gear ratio between 0 and the small diameter pinion 13, only a small amount of human power is required.
4 and the bending roller 15 to the positions shown in FIG. 2, the pipe material 5 can be removed from the groove 9 of the winding roller 6, and the bent finished product can be easily removed.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing an embodiment of the pipe bender according to the present invention, FIG. 2 is a plan view of FIG. 1, FIG.
The figure is a side view of the bending roller, and FIG. 5 is an explanatory diagram of the operation of FIG. 2. DESCRIPTION OF SYMBOLS 1...Support board, 2...Workbench, 3...Gripper plate, 4...Abutment tube, 5...Pipe material, 6...Wrap roller, 7...Intermediate collar, 9...Groove, 10
... Large diameter gear, 11 ... Pin, 12 ... Drive means, 13 ... Small diameter pinion, 14 ... Rotating plate, 1
5...Bending roller, 16...Groove, 17...Bearing sleeve, 18...Shaft, 19...Handle.

Claims (1)

[Scope of utility model registration request] A support substrate 1 provided with a grip plate 3 that can be attached to a workbench 2 such as a vice, and an abutment tube 4 that is provided upright at the end of the support substrate 1 and receives bending stress applied to the pipe material 5. The pipe material 5 is spaced apart from the abutting tube 4 and is mounted on a support substrate 1 with a shaft 8, and has a plurality of grooves 9 on its outer periphery, and the bent portion of the pipe material 5 is fitted into these grooves 9 to perform the bending process. a large-diameter gear 10 fixed on the supporting substrate 1 coaxially with the winding roller 6 by means of an intermediate collar 7 and a pin 11; A rotary plate 14 is rotatably disposed between the diameter gear 10 and the winding roller 6, and is fixed upright on the rotary plate apart from the winding roller 6 to receive the other end of the pipe material 5 and to fit the groove of the winding roller 6. A bending roller 15 having a plurality of grooves 16 corresponding to the bending roller 15 is provided on a rotary plate 14 apart from the bending roller 15, a small diameter pinion 13 that meshes with a large diameter gear 10 is fixed at the lower end, and the middle part is attached to the rotary plate 14. The driving means 12 includes a shaft 18 which is rotatably inserted into a bearing cylinder 17 which is provided with a handle 19 at the upper end of the insertion plate 14, and which is rotatably inserted into a bearing sleeve 17 which is provided on a rotary plate 14. The handle 19 is rotated by input, and the small diameter pinion 13 is rotated by the input. A pipe bender characterized in that a rotating plate 14 is rotated by planetary movement of the outer periphery of the large diameter gear 10 while meshing with the large diameter gear 10.