JP3180155U - Expanded sleeve - Google Patents

Abstract

A tube expansion sleeve capable of expanding a tube having a tube diameter of 6 mm or more and 8 mm or less is provided.
A tube expanding sleeve includes a cap, a tube expanding head, and a circular spring, and is mounted on a tube expander. The cap 2 is screwed into the working end of the tube expander, and an annular space 23 is formed between the end cover 21 and the partition 22 and has a through hole 24. The tube expansion head 3 is hardened by heat treatment and has a plurality of fan blocks 30. The tube expansion head 3 has an expansion ring 31, a support column 32, and a tapered hole. The expansion ring 31 can be accommodated in the annular space 23, and a ring groove 310 is formed at the outer peripheral end. The support 32 has an outer diameter of 6 mm or more and 8 mm or less.
[Selection] Figure 2

Description

  The present invention relates to a tube expanding sleeve, and more particularly to a tube expanding sleeve that can be installed in an expander to expand a tube.

  Conventionally, an expansion device described in Patent Document 1 is known. Further, as shown in FIGS. 5 and 6, a tube expansion head 91 is installed in the cap 90, and the tube expansion head 91 includes a plurality of fan-shaped blocks 910 adjacent to each other, and a column 92 is formed on the tube expansion head 91. The tube A is known as an expansion sleeve that can be fitted to the column 92. As shown in FIG. 7, when the tube expander 93 presses the press handle 930, the plurality of fan-shaped blocks 910 are radially expanded by the movement of a tapered cylinder (not shown) in the tube expander 93, and The diameter also increases. Thereby, the pipe | tube A inserted in the support | pillar 92 can expand a pipe | tube.

JP 2006-247747 A

  However, in the conventional technique, when the tube expansion head 91 is used, the tube diameter of the expandable tube is larger than 8 mm. A tube having a diameter of 6 mm or more and 8 mm or less cannot be expanded using a conventional tube expansion sleeve. The strut that comes into contact with a pipe having a tube diameter of 8 mm or less is relatively thin, and the strut tends to tear during the expansion process. Therefore, it is difficult to expand a tube having a tube diameter of 6 mm to 8 mm.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a tube expansion sleeve capable of expanding a tube having a tube diameter of 6 mm or more and 8 mm or less.

A tube expansion sleeve according to the present invention is a tube expansion sleeve that is provided at one end of a press handle of an expander and is driven by a reciprocating linear movement of a tapered cylinder interlocking with the press handle to expand a tube. A cap, a tube expansion head, and a circular shape A spring is provided.
The cap is formed in a cylindrical shape, an end cover formed at one end, an internal thread formed on the inner wall of the other end and screwable to one end of the press handle, and an end formed between the end cover and the internal thread. A partition that is parallel to the cover, an annular space formed between the end cover and the partition, and a through hole that penetrates the end cover and the partition in the axial direction.
The tube expansion head is hardened by heat treatment, has a cylindrical shape, is formed by assembling a plurality of fan-shaped blocks equally divided in the circumferential direction, and is formed in an annular shape that is formed at one end in the axial direction and protrudes in a direction perpendicular to the axial direction. The expansion ring has a columnar column projecting to the other end in the axial direction, a tapered hole capable of contacting the tapered cylinder, and a ring groove formed in the expansion ring and recessed in a direction perpendicular to the axial direction. It can be accommodated in the annular space, and the support column can be exposed from the through hole to the outside of the cap.
The circular spring is provided in the annular space of the cap, is fitted in the ring groove, and provides an elastic force that suppresses the radial expansion of the plurality of sector blocks by contacting the sector blocks and the tapered cylinder. To do. The diameter of the support of the sector block is 6 mm or more and 8 mm or less.

  Thereby, the pipe expansion sleeve by this invention can expand the pipe | tube whose diameter is 6 mm or more and 8 mm or less. Further, the plurality of sector blocks in the tube expansion head can be automatically retracted and restored after expansion by the elastic force of the circular spring.

It is a perspective view which shows the pipe expansion sleeve by one Embodiment of this invention. It is a disassembled perspective view of the tube expansion sleeve by one Embodiment of this invention. It is sectional drawing of the pipe expansion sleeve by one Embodiment of this invention. It is a mimetic diagram showing expansion operation of a tube expansion sleeve by one embodiment of the present invention. It is an external appearance perspective view which shows the conventional pipe expansion sleeve. It is a schematic diagram which shows the conventional pipe expansion sleeve. It is a schematic diagram which shows the conventional pipe expansion sleeve.

Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments described below.
(One embodiment)
A tube expansion sleeve according to an embodiment of the present invention is installed in a tube expander 1 having a press handle 10. One end of the press handle 10 has a working end 11, and the tube expansion sleeve can be screwed to the working end 11. The taper cylinder 12 reciprocates linearly in conjunction with the press handle 10 and drives the tube expansion sleeve to expand the tube.

  As shown in FIGS. 1 and 2, the tube expansion sleeve of this embodiment includes a cap 2, a tube expansion head 3, and a circular spring 4. As shown in FIGS. 2 and 3, the cap 2 is formed in an annular shape, has a female screw portion 20, and can be screwed into the working end portion 11 of the tube expander 1. An end cover 21 is formed at one end of the cap 2, and a partition 22 that is parallel to the end cover 21 is formed in the cap 2. An annular space 23 is formed between the middle partition 22 and the end cover 21. The cap 2 has a through hole 24, and the through hole 24 passes through the end cover 21 and the partition 22 in the axial direction.

  As shown in FIGS. 2 and 3, the tube expansion head 3 has an annular shape and is cured by heat treatment. The tube expansion head 3 is equally divided into six sector blocks 30, and the six sector blocks 30 are adjacent to each other. The six fan-shaped blocks 30 are formed annularly on the outer periphery of the tube expansion head 3 in the form of an expansion ring 31 protruding in the lateral direction. A support column 32 is formed on the top surface of the tube expansion head 3 so as to extend in the heel direction. In addition, the tube expansion head 3 has a tapered hole 33 that can contact the tapered cylinder 12. The expansion ring 31 is provided in the annular space 23, and is fitted into a ring groove 310 that is recessed radially inward and formed in an annular shape at an end portion of the expansion ring 31 in the radially outward direction. The support column 32 protrudes from the through hole 24 and is exposed to the outside of the cap 2 and has an outer diameter of 6 mm or more and 8 mm or less. In the present embodiment, the six fan blocks 30 form a guide head 320 at the top end of the column 32. In the present embodiment, the hardness after heat treatment of each individual sector block 30 of the tube expansion head 3 is between 38 HRC and 42 HRC.

  As shown in FIG. 3, the circular spring 4 is installed in the annular space 23 of the cap 2 and is fitted into the ring groove 310. The circular spring 4 provides an elastic force in which the plurality of sector blocks 30 abut against the tapered cylinder 12 and radially expand outward and retract and retract.

  The tube expansion sleeve of this embodiment is used for expansion of a tube having a tube diameter of 6 mm or more and 8 mm or less. In the tube expansion sleeve of this embodiment, when the outer diameter of the support column 32 is 6 mm or more and 8 mm or less, a tube having a tube diameter of 6 mm or more and 8 mm or less (indicated by the tube A in the drawing) can be fitted to the support column 32 of the tube expansion head. The tube A is smoothly fitted into the support column 32 by the guide head 320.

  When the user starts gripping and pressing the press handle 10 of the tube expander 1 during tube expansion, the tube expansion sleeve of the present embodiment has a tapered tube 12 in the working end 11 as shown in FIG. It moves back and forth in a straight line in the direction of 3. The tapered cylinder 12 enters the tapered hole 33, and the annular wall pushes and opens the six sector blocks 30, and the sector blocks 30 are opened radially. The support column 32 is fitted to the tube A, and can gradually expand the tube to expand the tube to a predetermined tube diameter.

  According to the above description, in this embodiment, since all the fan-shaped blocks 30 of the tube expansion head 3 are all heat-treated, the hardness is higher than that of the conventional tube expansion head. Therefore, even if the column 32 is thin, the tube diameter is 6 mm. The tube of 8 mm or less can be expanded.

  When each sector block 30 is expanded, each sector block 30 is retracted by the elastic force provided by the circular spring 4 fitted to the expansion ring 31 in the annular space. Therefore, each fan block 30 can be automatically contracted and restored after being expanded.

  As mentioned above, this invention is not limited to the above-mentioned embodiment, It can apply to a various form in the range which does not deviate from the summary.

1 ... Tube expander,
2 ... Cap,
3 ... Tube expansion head,
4 ... Circular spring,
10 ... Press handle,
11 ... working end,
12 ... Tapered tube,
20 ... Female thread part,
21 ... End cover,
22 ... partition,
23 ... annular space,
24 ... through hole,
30: Fan block,
31 ... Expansion ring,
32 ... posts,
33. Tapered hole,
310 ... ring groove,
320 ... guide head,
A ... Tube.

Claims (3)

An expanded sleeve that is provided at one end of a press handle of the expander and is driven by a reciprocating linear movement of a tapered cylinder interlocking with the press handle, and expands the pipe,
An end cover that is formed in a cylindrical shape and formed at one end, an internal thread portion that is formed on the inner wall of the other end and can be screwed into the one end of the press handle, and is formed between the end cover and the internal thread portion. A partition parallel to the end cover, an annular space formed between the end cover and the partition, and a cap having a through-hole penetrating the end cover and the partition in the axial direction;
An annular expansion ring, which is hardened by heat treatment, is cylindrical, is formed by assembling a plurality of sector blocks equally divided in the circumferential direction, and is formed at one end in the axial direction and protrudes in a direction perpendicular to the axial direction A columnar column projecting to the other end of the direction, a tapered hole capable of contacting the tapered cylinder, and a ring groove formed in the expansion ring and recessed in a direction perpendicular to the axial direction, A tube expansion head that can be accommodated in an annular space, and wherein the support column can be exposed outside the cap from the through hole;
An elastic force that is provided in the annular space of the cap, is fitted in the ring groove, and prevents the plurality of sector blocks from radially expanding when the plurality of sector blocks and the tapered cylinder come into contact with each other. A tube-shaped expansion sleeve, wherein a diameter of the support column of the sector block is 6 mm or more and 8 mm or less.   The tube expansion sleeve according to claim 1, wherein a guide head is formed at a top end of the support column, and the guide head guides the support column to be fitted into a pipe.   The tube expansion sleeve according to claim 1, wherein the hardness of the plurality of sector blocks is 38 HRC or more and 42 HRC or less.

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