TWI572423B - The structure of the pipe expander - Google Patents

Description

Expander structure

The invention relates to a pipe expander, in particular to a tool for expanding a pipe.

As shown in Fig. 7, in the structure of the conventional pipe expander, a shaft member 92 is disposed in the body 91, and the body is provided with a driving head 93. The body 911 of the body 91 has a guiding slot 912 for the clamping block 94 to be placed. The main body 91 has a through hole 913 extending upwardly through the body 91 and passing down the guide groove 912. The body 91 has an internal thread 914 at the top end of the through hole 913, and a bearing 95 is disposed at the bottom end of the through hole 913. The shaft member 92 is disposed on the body 91. The inner head has a tapered head 921. The driving head 93 has an outer thread 931 which is screwed to the inner thread 914. The outer thread 931 and the inner thread 914 are relatively rotated by the rotation of the driving head 93, so that the shaft member 92 is rotated. Due to the side displacement, the tapered head 921 can expand the tube 96 clamped by the clamp 94 due to the eccentricity.

The structure of the conventional pipe expander is such that when the screw 931 is screwed into the inner screw 914 to the bottom of the driving head 93, the tapered head 921 continuously presses the pipe member 96 as the driving head 93 continues to rotate. At this time, the pipe member 96 is deformed due to excessive pressure. Therefore, the conventional expander has a structure in which the driving head 93 is provided with a torque setting, and when the outer screw 931 of the driving head 93 is screwed into the inner screw 914 to the bottom, if the driving head 93 continues to rotate, the taper is tapered. The head 921 will no longer apply pressure to the tube 96 to ensure that the tube 96 will not deform due to excessive pressure.

However, another problem that often occurs in practice is that after the pipe expansion operation is completed, the driving head 93 must be reversed to rotate the outer screw 931 in the direction of withdrawing the inner screw 914, if the driving head 93 is driven by an electric screwdriver or When a hand tool that provides a large torque such as a pneumatic screwdriver is driven, if the driving head 93 is rotated to the limit in the direction of exiting the internal thread 914 and does not stop immediately, the body 91 will be twisted as the driving head 93 is driven. If the hand is held by the body 91, the hand may be sprained due to the inability to withstand the twisting force; if the body 91 is fixed by the tool of the vise, the hand tool may cause excessive loss of the component due to the twist, and the service life is thus reduced.

Therefore, how to solve the problem of the structure of the above conventional expander is the main focus of the present invention.

The main object of the present invention is to solve the above problems and to provide a structure of a pipe expander to ensure that the hand is not sprained by twisting, and that the hand tool can be prevented from being degraded due to wear and tear.

For the purposes of the foregoing, the present invention comprises: a body having a body and a neck at the top end of the body, the body having a guide slot for the clip of the clamped tubular member, a perforation The body passes through the neck at the top end and the bottom end communicates with the guiding groove; a ring body is fixed in the neck in the perforation, the ring system is hollow and has an internal thread; a bearing is fixed At the bottom end of the perforation and adjacent to the guiding groove; a driving head having an external thread can be screwed into the inner thread of the ring body with the forward rotation of the driving head, and the external thread can be The drive head is reversed and fully rotated upwards The inner thread; a shaft member is disposed in the body, the top end of the shaft protrudes from the neck portion and is coupled to the driving head, and the bottom end has a guide post located in the bearing, and has a pole at the guide post a conical head arranged eccentrically; a compression elastic member disposed in the body and sleeved on the shaft member, the top end of the compression elastic member abutting against the bottom edge of the ring body, and the bottom end is opposite The column pushes down.

Wherein, the compression elastic member is a conical spiral spring.

The top end of the guide post is provided with a pad body having an outer diameter larger than the guide post, and the bottom end of the compression elastic member is placed on the pad body and pushed against the guide post.

The top end of the guide post has a ring recess formed by reducing the outer diameter, and the pad body is coaxially positioned with the guide post in the ring recess.

The above and other objects and advantages of the present invention will be readily understood from

Of course, the invention may be varied on certain components, or in the arrangement of the components, but the selected embodiments are described in detail in the specification and their construction is shown in the drawings.

(customized part)

91‧‧‧Ontology

911‧‧‧ Body

912‧‧ ‧ guide slot

913‧‧‧Perforation

914‧‧‧ internal thread

92‧‧‧ shaft parts

921‧‧‧Conical head

93‧‧‧Drive head

931‧‧‧ External thread

94‧‧‧Clamp

95‧‧‧ bearing

96‧‧‧ Pipe fittings

(part of the invention)

1‧‧‧ Ontology

11‧‧‧ Body

12‧‧‧ neck

13‧‧‧ Guide slot

14‧‧‧Clamp

15‧‧‧Perforation

2‧‧‧Act

21‧‧‧ internal thread

3‧‧‧ Bearing

4‧‧‧Drive head

41‧‧‧ External thread

42‧‧‧ recess

5‧‧‧ shaft parts

51‧‧‧ Guide column

511‧‧‧ring

52‧‧‧Conical head

53‧‧‧

6‧‧‧Compressed elastic parts

7‧‧‧ screwdriver head

A‧‧‧ pipe fittings

Figure 1 is a perspective view of the present invention.

Figure 2 is an exploded configuration view of the present invention.

Fig. 3 is a schematic view showing the state of use of the cross-sectional structure and tube expansion of the present invention.

Fig. 4 is a schematic cross-sectional view showing the driving head of the present invention reversed until the outer thread completely withdraws from the inner thread.

Fig. 5 is a partially enlarged schematic view showing the cusps of the external thread of the present invention temporarily abutting against the cusps of the internal thread.

Fig. 6 is a partially enlarged schematic view showing the cusp of the external thread of the present invention when it is detached from the cusp of the internal thread.

Figure 7 is a schematic cross-sectional view of a conventional expander.

Referring to Figures 1 through 6, the structure of the embodiment selected for use in the present invention is for illustrative purposes only and is not limited by such structure in the patent application.

The embodiment provides a structure of a pipe expander, as shown in Figures 1 to 2, comprising a body 1, a ring body 2, a bearing 3, a driving head 4, a shaft member 5 and a compression elastic member 6, Wherein, as shown in Figures 2 to 3, the body 1 has a body portion 11, and a neck portion 12 at the top end of the body portion 11, the body portion 11 has a guiding groove 13 for guiding the tubular member A clip 14 of A is placed, a through hole 15 is passed through the neck portion 12 at the top end of the body portion 11, and the bottom end of the through hole 15 communicates with the guide groove 13.

As shown in Fig. 3, the ring body 2 is fixed in the neck portion 12 in the through hole 15, the ring body 2 is hollow and has an internal thread 21; the bearing 3 is fixed at the bottom of the through hole 15. The end is adjacent to the guide groove 13.

As shown in FIGS. 2 to 3, the driving head 4 has an external thread 41, and the screw 41 can be screwed into the internal thread 21 of the ring body 2 with the forward rotation of the driving head 4, and the screw 41 The outer thread 41 can completely unscrew the inner thread 21 upward with the reverse rotation of the driving head 4. In the present embodiment, the driving head 4 has a recess 42 which can be inserted into a driver's head of a hand tool such as an electric screwdriver or a pneumatic screwdriver and driven by the hand tools. Place The forward rotation does not mean that it rotates clockwise, and the reverse rotation does not mean the counterclockwise rotation. The forward rotation and the reverse rotation are opposite to each other, that is, when one rotates clockwise or counterclockwise, the other Turn in the opposite direction.

As shown in FIGS. 2 to 3, the shaft member 5 is disposed in the body 1 with a top end extending from the neck portion 12 and coupled to the driving head 4, and a bottom end having a guide post located in the bearing 3 51, and has a tapered head 52 disposed eccentrically under the guide post 51.

As shown in the second embodiment, the compression elastic member 6 is disposed in the body portion 11 and sleeved on the shaft member 5. The top end of the compression elastic member 6 abuts against the bottom edge of the ring body 2 and is compressed. The bottom end of the elastic member 6 pushes the guide post 51 downward.

As shown in the second to third embodiments, the compression elastic member 6 of the present embodiment is a conical spiral spring; further, the top end of the guide post 51 is provided with a pad body 53 having an outer diameter larger than the guide post 51. In detail, the present embodiment The top end of the guide post 51 has a ring recess 511 formed by a reduced outer diameter, and the pad body 53 is coaxially positioned with the guide post 51 in the ring recess 511, and the bottom end of the compressive elastic member 6 is placed on the pad body. 53 is pushed against the guide post 51.

As shown in FIG. 3, in the actual pipe expansion operation, after the pipe member A is clamped by the clamp block 14, the clamp block 14 is placed in the guide groove 13 of the body portion 11, and the pipe member A is aligned with the taper head 52. The screwdriver head 7 connected to the hand tool such as an electric screwdriver or a pneumatic screwdriver can be placed in the recess 42 of the driving head 4, and the hand tool can be operated to cause the driver head 7 to drive the driving head 4 to rotate. The head 52 expands the tube A.

After the pipe member A is expanded by the conical head 52, the hand tool can be set to be reversed, and the screw 41 of the driving head 4 can be driven out of the inner screw 21 by the driver 7 to be driven. Rotating until the inner thread is completely unscrewed as shown in Fig. 4, at this time, the guide post 51 is pushed downward by the compression elastic member 6, and the screw 41 is interlocked by the shaft member 5. Abutting the thread 21 inside the ring body 2, if the external thread is as shown in Fig. 5 41 is partially enlarged at the intersection of the internal thread 21, and the cusp 411 of the external thread 41 temporarily abuts against the tip 211 of the internal thread 21. At this time, if the driving head 4 is reversed, the cusp 411 will As shown in Fig. 6, the barrier of the cusp 211 is released, and the cusp 411 is attached to the internal thread 21 by the action of the compression elastic member 6, and the drive head 4 continues until the internal thread 21 is ready to be screwed. When reversing, the outer thread 41 will be repeatedly idling at the position where the inner thread 21 is ready to be screwed again, and when the driving head 4 is further driven to rotate in the forward direction, the outer thread 41 can be screwed in again. In the internal thread 21, the pipe expansion operation can be performed again.

From the above description, it is not difficult to find that the present invention is advantageous in that when the driving head 4 is driven by the driver's head 7 and reversed, the outer thread 41 is rotated in the direction of withdrawing the inner thread 21 to completely withdraw the inner thread. At 21 o'clock, the instant screwdriver head 7 continues to be rotated by the hand tool, causing the drive head 4 to continue to rotate. At this time, the outer screw 41 can be repeatedly idling at the place where the inner thread 21 is ready to be screwed again. It can be avoided that the structure of the conventional expander will generate a torsional force when the driving head is rotated to the limit in the direction of withdrawing the internal thread, thereby ensuring that the hand will not be sprained due to the twist, and the hand tool can be prevented from being lost due to the loss. reduce.

The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the scope of the invention.

From the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the foregoing objects and is in accordance with the provisions of the Patent Law.

1‧‧‧ Ontology

11‧‧‧ Body

12‧‧‧ neck

13‧‧‧ Guide slot

15‧‧‧Perforation

2‧‧‧Act

21‧‧‧ internal thread

3‧‧‧ Bearing

4‧‧‧Drive head

41‧‧‧ External thread

42‧‧‧ recess

5‧‧‧ shaft parts

51‧‧‧ Guide column

511‧‧‧ring

52‧‧‧Conical head

53‧‧‧

6‧‧‧Compressed elastic parts

Claims (4)

A structure of a pipe expander, comprising: a body having a body portion and a neck portion at a top end of the body portion, the body portion having a guide groove for inserting a clamp of the clamped pipe member, a perforation The body passes through the neck at the top end and the bottom end communicates with the guiding groove; a ring body is fixed in the neck in the perforation, the ring system is hollow and has an internal thread; a bearing is fixed At the bottom end of the perforation and adjacent to the guiding groove; a driving head having an external thread can be screwed into the inner thread of the ring body with the forward rotation of the driving head, and the external thread can be The inner head is completely unscrewed by the reverse rotation of the driving head; a shaft member is disposed in the body, the top end of the shaft is extended to the neck portion and coupled to the driving head, and the bottom end is located in the bearing a guide post having a conical head disposed eccentrically under the guide post; a compression elastic member disposed in the body and sleeved on the shaft member, the top end of the compression elastic member abutting against the ring The bottom edge of the body, and the bottom end pushes the guide column downward. The structure of the expander of claim 1, wherein the compression elastic member is a conical spiral spring. The structure of the expander according to claim 1, wherein the top end of the guide post is provided with a pad body having an outer diameter larger than the guide post, and the bottom end of the compressive elastic member is placed on the pad body and pushed against the guide body. column. The structure of the expander according to claim 3, wherein the top end of the guide post has an outer The annular recess formed by the diameter reduction, the cushion body being positioned coaxially with the guide post in the annular recess.