JP3478349B2 - Jig for vulcanizing bent rubber hose - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending rubber hose vulcanizing jig which is used by inserting an unvulcanized rubber hose and setting it in a vulcanizing device when vulcanizing and molding a bent rubber hose.

[0002]

2. Description of the Related Art Conventionally, a bent rubber hose has been manufactured by inserting a bent iron core into an unvulcanized rubber hose, setting it in a vulcanizing device such as a vulcanizing can, and vulcanizing and molding it.
At this time, in order to regulate the length of the bent rubber hose and the outer diameter of the end, a fixing tool attached to a frame in the vulcanizer is fixed to the end of the bent iron core, and the rubber hose is concentric with the iron core. A vulcanizing jig in which a substantially cylindrical cap into which an end is inserted is fixed to the iron core side of the fixture is widely used.

As a vulcanizing jig for such a bent rubber hose, there is, for example, the one described in Japanese Utility Model Publication No. 5-36653. As shown in FIG. 6, this vulcanizing jig has a columnar base metal 2 having a central hole 1 in the axial direction and one end attached to the vulcanizer, and one end in the central hole 1 of the base metal 2. Is inserted and fixed, and a substantially cylindrical cap 4 arranged concentrically around the iron core 3 protruding from the base metal 2. Further, the base metal 2 and the cap 4 are relatively detachably fitted to the groove 6 of the base metal 2 with the projection 5 protruding from the inner surface of the end of the cap 4. By using such a vulcanizing jig, the end of the soft unvulcanized rubber hose is regulated, and the length of the rubber hose and the outer diameter of the end of the rubber hose are guaranteed. Then, by making the base metal 2 and the cap 4 detachable, the work of disassembling and assembling the vulcanizing jig during cleaning can be efficiently performed.

[0004]

However, the above rubber hose vulcanizing jig has the following problems. That is, although a predetermined curved rubber hose can be obtained by pushing the end of the rubber hose into the cap 4, the base metal 2 and the cap 4 are fixed, and therefore the curved portion of the iron core 3 is formed close to the cap 4. If there is, there is a problem that the unvulcanized rubber hose cannot be smoothly pushed into the cap 4. In particular, the smaller the radius of the curved portion and the smaller the included angle, the more difficult it is to push the rubber hose end into the cap 4. This is because when the unvulcanized rubber hose is inserted, the outside of the hose end bulges when the hose end overlaps the curved part of the iron core.

For example, as shown by the dotted line in FIG.
In the case of the iron core 8 having the curved portion 7 formed by bending at a right angle in the vicinity of the cap 4, when the end portion of the cap 4 bulges outward like an unvulcanized rubber hose 9 shown by a two-dot chain line. It becomes difficult to come into contact with the Further, if only the outside of the end of the rubber hose is pressed and pushed into the cap 4, there is a problem that the efficiency of the iron core insertion work is poor.

The present invention has been made in view of the present situation, and it is possible to easily insert the unvulcanized rubber hose into the cap without deforming the end portion of the unvulcanized rubber hose and to confirm that the hose has been inserted to a predetermined position. It is intended to provide a jig for vulcanization of a bent rubber hose.

[0007]

In order to achieve the above object, the present invention has the following constitution. That is, a fixing tool is attached to the end of the iron core, and a stopper is fixed with a fixed gap between the fixing tool and the fixing tool, and the inner diameter around the iron core is approximately the same as the outer diameter of the rubber hose. A cylindrical cap is arranged, and the cylindrical cap is configured to be slidable between the fixing tool and the stopper while the inner surface slides on the stopper. In the above configuration, an inward flange is provided at one end of the cylindrical cap through which an iron core is inserted and is locked to a stopper, the inward flange is locked to the stopper, and the inward flange and the fixture are fixed. A cylindrical elastic body for urging the cylindrical cap toward the stopper may be disposed between the cylindrical cap and the cylindrical cap to slide against the cylindrical elastic body. The cylindrical elastic body may be a coil spring, a rubber cylinder, a foam cylinder, or the like. Further, the cylindrical cap and the stopper are detachably fitted by a protrusion and a groove provided relatively to each other, and when the engagement state of the protrusion and the groove is released, the cylindrical cap is provided between the stopper and the fixture. You may slide with. Further, the cylindrical cap and the stopper may be detachable by screwing, and when the screwing is released, the cylindrical cap may slide between the stopper and the fixture.

[0008]

By making the cylindrical cap slidable between the stopper and the fixing tool, it is possible to prevent the cylindrical cap from hitting the end face of the cylindrical cap when the unvulcanized rubber hose is pushed in. That is, when the unvulcanized rubber hose approaches the cylindrical cap, slide the cylindrical cap toward the fixture side and further press the unvulcanized rubber hose, and the end of the unvulcanized rubber hose will be straight part of the iron core. Can be advanced to. Therefore, the end of the unvulcanized rubber hose does not bulge outward and is pushed into the cylindrical cap. Then, the end of the unvulcanized rubber hose can be completely inserted into the cylindrical cap by sliding the cylindrical cap toward the stopper. Also, by sliding the cylindrical cap toward the fixture, it is possible to easily confirm whether or not the end of the unvulcanized rubber hose has reached the stopper. Further, when the fixture is detachable, the cylindrical cap and the fixture can be easily disassembled and assembled.

[0009]

EXAMPLES The present invention will be described in detail based on examples.
1 and 2 are a perspective view and a sectional view of a main part showing a first embodiment of the present invention. The bending rubber hose vulcanization jig A is
A fixing tool 13 is attached to the tip end of the iron core 11, and a stopper 15 is fixed to the fixing tool 13 with a constant space provided between the fixing tool 13 and the iron core 11. A cylindrical cap 17 having the same diameter is arranged. The fixing tool 13 serves as a pedestal when the fixing tool 13 is installed in the vulcanizing device or the vulcanized rubber hose is pulled out, and the iron core 11 is inserted and fixed in the center hole. The fixture 13 and the iron core 11 may be welded, but they may be fixed by screwing and may be detachable. The stopper 15 and the iron core 11 can be fixed to each other by welding, a spring pin or the like.

Further, an inward flange portion 19 through which the iron core 11 is inserted is provided at one end of the cap 17, and the inward flange portion 19 is engaged with the stopper 15. Therefore, the cap 17 is slidable between the fixture 13 and the stopper 15. A cap 17 is provided between the inward facing collar portion 19 and the fixture 13 so as to form a stopper 15.
A coil spring 20 that is a cylindrical elastic body that is biased toward the side is provided. When the cap 17 is pressed toward the fixture 13, the inner surface slides on the stopper 15 and slides toward the fixture 13 against the coil spring 20. When the pressing force is released, the inward flange 19 is pressed against the stopper 15 by the urging force of the coil spring 20. A cylindrical cap is detachably attached to the tip of the iron core 11 on the side opposite to the attachment side of the fixture 13 by a conventionally known method. The cylindrical elastic body can be formed of a rubber cylinder, a foam cylinder or the like in addition to the coil spring 20.

As for the method of using the above-mentioned vulcanizing jig A, an unvulcanized rubber hose is inserted from the open end of the iron core 11 coated with a release agent as appropriate. Then, when the tip end surface approaches the cylindrical cap 17 while pushing in the unvulcanized rubber hose, the cylindrical cap 17 is slid toward the fixture 13 side against the coil spring 20. If the unvulcanized rubber hose is further pushed in while holding the cylindrical cap 17 on the fixture 13 side, the end of the unvulcanized rubber hose advances to the straight part of the iron core 11 and the outward bulge disappears and the cylindrical cap 17 is inserted. It is inserted and reaches the stopper 15. After that, when the pressing force of the cylindrical cap 17 is released, the coil spring 20 is urged to slide, and the inward flange portion 19 is locked to the stopper 15. This ensures that the end of the rubber hose is pushed into the cap 17 without deformation.

FIGS. 3 and 4 show a second embodiment, in which the vulcanizing jig B is detachably fitted by means of projections and grooves provided relatively to the cylindrical cap and the stopper.
The cylindrical cap is configured to slide between the stopper and the fixture when the engagement between the protrusion and the groove is released. That is, a groove 23 is provided in the circumferential direction on the outer peripheral surface of the stopper 21 in which the iron core 11 is inserted and fixed in the center hole, and a notch 25 opening to the fixture 13 side is provided on the diagonal line of the groove 23. There is. On the other hand, on the inner surface of the distal end portion of the cylindrical cap 27, a projection 29 that passes through the notch 25 and fits in the groove 23 is provided.

Therefore, when the cylindrical cap 27 is slid to the stopper 21 side and the protrusion 29 is inserted into the notch 25 and rotated in the circumferential direction, the protrusion 29 is fitted and fixed in the groove 23. Further, in order to slide the cylindrical cap 27 toward the fixture 13, it is only necessary to turn the cylindrical cap 27 and align the projection 29 with the notch 25 and pull it toward the fixture 13. To use the above-mentioned vulcanizing jig B, the cylindrical cap 27 is slid to the fixture 13 side, and after the end of the unvulcanized rubber hose is inserted into the cylindrical cap 27 and reaches the stopper 21, The cap 27 may be slid to the stopper 21 side, the protrusion 29 may be inserted into the notch 25, and may be rotated in the circumferential direction to be fitted in the groove 23.

The number of the cutouts 25 and the projections 29 is not limited to the number in the above embodiment, and can be appropriately determined as long as it is 1 or more. The grooves 23 are not necessarily continuous in the circumferential direction, but may be intermittently independent. Further, contrary to the above-mentioned embodiment, notches and grooves are provided on the inner surface of the cylindrical cap, and the protrusion is provided with the stopper 2.
It can be projected to 1. In this case, the notch may be provided so as to open on the side opposite to the fixture 13.

FIG. 5 shows a third embodiment, in which the vulcanizing jig C is detachable by screwing the cylindrical cap and the stopper, and when the screwing is released, the cylindrical cap is fixed by the stopper and the fixture. It is configured to slide between and. That is, on the outer peripheral surface of the stopper 30 in which the iron core 11 is inserted and fixed in the central hole, the flange portion 3 facing outwardly on one end side is formed.
1, the male screw 33 is engraved on the fixture 13 side,
On the other hand, on the inner surface of the distal end portion of the cylindrical cap 35, a female screw 37 that is screwed into the male screw 33 is engraved.

Therefore, the stopper 30 and the cylindrical cap 35 are fixed by screwing the male screw 33 and the female screw 37, and are regulated by the flange 31 on the iron core 11 side. The method of using the above-mentioned vulcanizing jig C is the stopper 3
No. 0 and the cylindrical cap 35 are fixed differently from the vulcanizing jig B, and detailed description thereof is omitted to avoid duplication. Further, the collar portion 31 may be omitted and a screw may be engraved on the entire peripheral surface. In this case, the cylindrical cap 35 can be released to either side of the stopper 30.

[0017]

According to the present invention, even if the curved portion is formed on the iron core in the vicinity of the cylindrical cap, the straight portion can be lengthened by sliding the cylindrical cap. The vulcanized rubber hose can be easily inserted into the cylindrical cap without the outward bulge. Further, by sliding the cylindrical cap toward the fixture, it can be confirmed that the end portion of the unvulcanized rubber hose is attached to a predetermined position.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts of a first embodiment of the present invention.

FIG. 2 is a sectional side view of the same.

FIG. 3 is a sectional side view of a second embodiment of the present invention.

FIG. 4 is a perspective view of the cylindrical cap, which is also cross-sectioned with the stopper.

FIG. 5 is a sectional side view of the third embodiment of the present invention.

FIG. 6 is a partially cutaway side view showing a conventional example.

[Explanation of symbols]

11 iron core 13 Fixture 15 stopper 17 Cylindrical cap 19 Inward facing collar 20 coil spring 21 Stopper 23 groove 25 notches 27 Cylindrical cap 29 Protrusion 30 stopper 31 brim 33 Male screw 35 Cylindrical cap 37 female screw

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 35/00-35/18 B29C 33/02-33/68 B29D 22/00-23/24

Claims (5)

(57) [Claims] 1. A fixing tool is attached to one end of an iron core, and a stopper is fixed to the fixing tool with a fixed space provided between the fixing tool and the iron core. A jig for vulcanization of a curved rubber hose, wherein a cylindrical cap having a diameter is arranged, and the cylindrical cap is slidable between the fixing tool and the stopper while the inner surface slides on the stopper. 2. An inward flange for inserting an iron core into one end of the cylindrical cap and engaging with the stopper is provided, and the cylindrical cap is urged toward the stopper between the inward flange and the fixture. 2. A jig for vulcanization of a bent rubber hose according to claim 1, wherein a cylindrical elastic body is arranged. 3. The jig for vulcanizing a bent rubber hose according to claim 2, wherein the cylindrical elastic body is a coil spring. 4. The cylindrical cap and the stopper are detachably fitted by a projection and a groove provided relatively to each other, and the cylindrical cap is fixed to the stopper by releasing the fitted state of the projection and the groove. The jig for vulcanization of a bent rubber hose according to claim 1, wherein the jig is slidable between the jig and the tool. 5. The cylindrical cap and the stopper are detachable by screwing, and the cylindrical cap is slidable between the stopper and the fixture by releasing the screwing. Item 1. A jig for vulcanizing a curved rubber hose according to Item 1.