JP2016194371A - Shell cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shell cap easy to mounted on a shell end, excellent in mounting stability, and easy to be removed.SOLUTION: A shell cap 16 is mounted on a nut part provided at the shell end. The shell cap 16 is formed in a bottomed cylindrical shape and integrated with a cap body 17 to be fitted into the nut part and a flange part 18 provided at the opening end thereof. On the outer peripheral face of the cap body 17, a first engaging projection 19 and a second engaging projection 20 are provided for engaging with a female screw groove of the nut part. The first engaging projection 19 is located nearer the opening end of the cap body 17 than the second engaging projection 20. On the flange part 18 at a position near the first engaging projection 19, a grip piece 21 is protruded for cancelling the engagement of the first engaging projection 19 with the female screw groove.SELECTED DRAWING: Figure 1

Description

  The present invention is attached to a nut portion provided at the end of a pipe body such as a pipe body or a pipe joint in which a flow path is formed, and is used for preventing the packing from detaching and preventing foreign matter from entering the pipe body. The present invention relates to a tubular cap.

  This type of tube cap is formed of a synthetic resin and is mounted so as to close the opening of the nut portion in a state where the packing is housed in the nut portion of the tube end portion. In this state, the pipe body is transported to a place where it is connected to another pipe body, and the pipe cap is removed from the end portion of the pipe body when the pipe body is connected. By using such a tube cap, it is possible to prevent the packing from dropping off and the dust from entering the tube during transport of the tube.

  A protective cap as a tube cap of this type is disclosed in Patent Document 1. That is, the protective cap is attached to the end of the tubular body in which a screw member having a female screw portion is rotatably supported. The protective cap includes a base that contacts the end of the screw member, an insertion portion that is inserted into the female screw portion of the screw member from one surface of the base portion, and a protrusion that is formed on the outer peripheral surface of the insertion portion and engages with the female screw portion. And a grip portion extending from the other surface of the base portion.

JP 2004-270930 A

  In the protective cap of the conventional configuration disclosed in Patent Document 1, the shape of the protrusion of the insertion portion is formed so as to follow the shape of the thread groove of the female screw portion of the screw member. For this reason, when the protective cap is attached or detached, even if the insertion portion bends due to the elastic structure, the pair of protrusions must get over the screw thread from the state where it engages with the thread groove of the female thread portion, and engage or disengage from the thread groove. Neither operation is easy.

  Further, since the gripping portion of the protective cap extends in a plane direction connecting positions apart from the pair of protrusions by 90 ° in the circumferential direction, even if the gripping portion is pulled when removing the protective cap from the screw member, It is difficult for the pulling force to act directly on the protrusion, and it is not easy to remove the protective cap.

  Accordingly, an object of the present invention is to provide a tube cap that can be easily attached to the end of the tube, has excellent attachment stability, and can be easily removed.

In order to achieve the above object, the tube cap according to the first aspect of the present invention is a tube cap formed of a synthetic resin and attached to a nut portion provided at an end of the tube. A cap main body formed in a bottomed cylindrical shape and fitted into the nut portion, and a flange portion provided at an opening end portion of the cap main body, and a female screw groove of the nut portion on the outer peripheral surface of the cap main body A plurality of engaging protrusions are provided to be engaged with each other, and a gripping body for releasing the engagement of the engaging protrusions with respect to the female thread groove of the nut portion is formed on the flange portion in the vicinity of the engaging protrusions. The gripping body is formed at a position in the vicinity of the engaging protrusion close to the opening end of the cap body among the engaging protrusions.

In addition, the cap for a tubular body according to a second aspect of the present invention is the cap for a tubular body according to the first aspect, wherein a notch is formed by notching a flange portion at a portion facing the plurality of engagement protrusions, It is characterized in that it is provided at the end of the flange portion so as to face the notch facing the engaging projection close to the opening end of the cap body among the mating projections.

According to the present invention, the following effects can be exhibited.
In the cap for a tubular body of the present invention, a plurality of engaging projections are engaged with the female thread groove of the nut portion at the end of the tubular body on the outer peripheral surface of the cap body. Further, a gripping body is formed to protrude from the flange portion in the vicinity of the engaging protrusion.

  For this reason, when mounting the cap for the tube body on the nut part at the end of the tube body, the cap body is fitted into the female screw hole of the nut part, so that both engaging projections are flexibly deformed and easily engaged with the female screw groove. can do. And the engagement of both the engagement protrusions with the female thread groove is maintained.

  When the tube cap is removed from the nut portion, when the gripping body is gripped and pulled, the pulling force directly acts on the engaging protrusion at a position near the gripping body. As a result, the engagement protrusion on the grip body side is easily removed from the nut portion, and when the engagement protrusion on the grip body side is removed, the other engagement protrusion is easily removed from the nut portion.

  Therefore, according to the cap for a tubular body of the present invention, it is easy to attach to the end of the tubular body, has excellent attachment stability, and can be easily removed.

The perspective view which shows the cap for tubular bodies in embodiment of this invention. The front view which shows the cap for tubular bodies. (A) is a rear view which shows the cap for tubular bodies, (b) is sectional drawing in the 3b-3b line | wire of (a). FIG. 4 is a half sectional view taken along line 4-4 of FIG. 3; The disassembled perspective view which shows the nut part of a pipe body edge part, packing, and the cap for pipe bodies. (A) is a side sectional view showing a state in which the tube cap is attached to the nut portion at the end of the tube body, and (b) shows a state in which the locking projection of the flange portion is in contact with the outer end surface of the nut portion. FIG. The front sectional view which shows the state which mounted | wore the nut part of the pipe body end part with the cap for pipe bodies. The expanded sectional view which shows the state which engaged the engaging protrusion of the cap for tubular bodies with the internal thread groove of the nut part of a tubular body end part. Explanatory drawing which shows a fixed mold | type, a movable mold | type, and PL surface in the case of manufacturing the cap for tubular bodies by the injection molding method. The front view which shows the cap for tubular bodies of another example of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail with reference to FIGS.
As shown in FIGS. 5 and 6 (a), the tube body 11 is configured so that a fluid such as water can flow therethrough, and the flange portion 11a is bent at the end so that the entire circumference is expanded. Is provided. The nut portion 12 has a reduced diameter portion 12a whose entire circumference is reduced on one end side, and has a female screw hole 13 formed therein and opened on the other end side. As shown in FIG. 8, a female screw groove 14 is formed in the female screw hole 13, and the opening angle β of the female screw groove 14 is set to 55 °.

  As shown in FIG. 6A, the tube body 11 is inserted into the female screw hole 13 of the nut portion 12 from the other end side, and the flange portion 11 a of the tube body 11 is engaged with the reduced diameter portion 12 a of the nut portion 12. Thus, the nut portion 12 is connected to the end portion of the tube body 11. A packing 15 is inserted into the female screw hole 13 of the nut portion 12, and in this state, a male screw of another tube body (not shown) is screwed into the female screw hole 13 of the nut portion 12, thereby connecting the two tube bodies 11. It has come to be.

  Before the two pipe bodies 11 are connected, a pipe cap 16 is attached to the nut portion 12 via a packing 15 to prevent the packing 15 from falling off, and within the female screw hole 13 and further to the pipe body 11. It prevents dust from entering inside. The depth of the cap body 17 is set so that the cap body 17 does not contact the packing 15 in the female screw hole 13 of the nut portion 12 when the tube cap 16 is attached to the nut portion 12.

  As shown in FIGS. 1 and 4, the tubular body cap 16 is formed in a substantially bottomed cylindrical shape by a soft synthetic resin such as a polyethylene resin having flexibility. The tube cap 16 is integrally formed by a cap main body 17 fitted into the female screw hole 13 of the nut portion 12 and a flange portion 18 formed at the opening end of the cap main body 17. On the outer peripheral surface of the cap body 17, a pair of engaging protrusions 19 and 20 that engage with the female thread groove 14 of the nut portion 12 are provided at positions facing each other by 180 °.

  As shown in FIG. 6A, when the cap body 17 of the tube cap 16 is mounted in the female screw hole 13 of the nut portion 12, the engagement protrusions 19 and 20 of the tube cap 16 are formed on the nut portion 12. The female thread groove 14 is simultaneously entered and engaged. For this reason, one engagement protrusion 19 is provided at a position near the opening end of the tube cap 16, and the other engagement protrusion 20 is provided at a position slightly away from the opening end of the tube cap 16. . The engagement protrusion 19 on the opening end side is referred to as a first engagement protrusion 19, and the other engagement protrusion 20 is referred to as a second engagement protrusion 20.

  A gripping piece 21 as a gripping body that mainly releases the engagement of the first engagement protrusion 19 with respect to the female thread groove 14 of the nut portion 12 protrudes from the flange portion 18 in the vicinity of the first engagement protrusion 19. Yes. At the tip of the grip piece 21, a finger hook portion 21 a that functions as an anti-slip when the finger is hooked on the grip piece 21 is formed so as to bulge in the circumferential direction and the axial direction of the cap body 17. Yes.

  As shown in FIGS. 2 and 3 (a), in the flange portion 18, the flange portions 18 at portions facing the both engaging projections 19 and 20 are cut out to form notch portions 22 and 23, respectively. Yes. Of the two notches 22 and 23, the first notch 22 on the gripping piece 21 side is formed to be larger than the other second notch 23. The gripping piece 21 faces the first notch 22 at a position near the first engagement protrusion 19 near the opening end of the cap body 17 of the pair of engagement protrusions 19, 20. The cap body 17 extends radially outward from the end of the cap body 17.

  As shown in FIG. 8, the engaging protrusions 19 and 20 are formed in a tapered shape (substantially isosceles triangle shape) so that the proximal end side is thicker and the distal end side is gradually thinner. It consists of The inclination angle (vertical angle) α of both engaging protrusions 19 and 20 is set to 30 °. For this reason, when both the engagement protrusions 19 and 20 are engaged with the female thread groove 14 of the nut portion 12, a space is formed between the engagement protrusions 19 and 20 and the female thread groove 14. Further, the top edges 19 a and 20 a of the pair of engaging protrusions 19 and 20 are set so as to be located at the valley bottom 14 a of the female screw groove 14.

  The heights of both engaging protrusions 19 and 20 are set to be substantially the same as the depth of the female thread groove 14 of the nut portion 12. Therefore, as shown in FIGS. 7 and 8, when the engaging protrusions 19 and 20 are engaged with the female screw groove 14 of the nut portion 12, an engaging force between the engaging protrusions 19 and 20 and the female screw groove 14 is obtained. At the same time, it is possible to easily attach and detach the engaging protrusions 19 and 20 with respect to the female screw groove 14.

  As shown in FIG. 1 and FIG. 3A, when the cap body 17 is fitted into the female screw hole 13 of the nut portion 12 on the surface of the flange portion 18 on the cap body 17 side, the outer end surface of the nut portion 12 is abutted. A pair of locking projections 24 in contact with each other are provided at positions facing each other by 180 °. As shown in FIG. 3B, the locking projection 24 is formed in a circular arc shape in cross section. As shown in FIG. 6 (b), when these locking projections 24 abut against the outer end surface of the nut portion 12 and the cap body 17 is fitted into the female screw hole 13 of the nut portion 12, the engagement projections 19, 20. Can be engaged with the slope 14b of the female thread groove 14. For this reason, it becomes easy to maintain the engagement of the engagement protrusions 19 and 20 with the female thread groove 14, the engagement protrusions 19 and 20 of the cap body 17 rotate along the spiral female thread groove 14, and the tube cap 16 is moved. The release from the nut portion 12 can be suppressed.

  As shown in FIG. 9, the tube cap 16 is formed by an injection molding method of a soft synthetic resin such as polyethylene resin using an injection mold 27 having a fixed mold 25 and a movable mold 26. A PL surface (parting surface) 28 between the fixed die 25 and the movable die 26 is set at the position of the flange portion 18 of the tube cap 16, and at the first notch portion 22 and the second notch portion 23. Is set at the position of the first engagement protrusion 19 and the second engagement protrusion 20. Between the fixed mold 25 and the movable mold 26, a molding recess 29 (cavity) of the tube cap 16 is formed.

  Then, in a state where the movable mold 26 is clamped to the fixed mold 25, a polyethylene resin melt is injected into the molding recess 29 between the fixed mold 25 and the movable mold 26. Thereafter, the injection mold 27 is cooled, the movable mold 26 is opened from the fixed mold 25, and the molded product is taken out from the molding recess 29, whereby the tubular cap 16 can be manufactured. Therefore, the tube cap 16 can be easily formed using only the fixed mold 25 and the movable mold 26 without using a slide core or a core.

Next, the operation of the tube cap 16 configured as described above will be described.
As shown in FIG. 5, when the tube cap 16 is attached to the nut portion 12 at the end of the tube body 11, the tube cap 16 is first provided with the female screw hole 13 of the nut portion 12 on the cap body 17 side. It arrange | positions so that it may oppose. Subsequently, as shown in FIG. 6A, the flange portion 18 of the tube cap 16 is pressed toward the outer end surface of the nut portion 12, and the cap body 17 is inserted into the female screw of the nut portion 12 via the packing 15. Insert straight into hole 13.

  At this time, the pair of engaging protrusions 19 and 20 engage with the female thread groove 14 of the nut portion 12, but the tube cap 16 is formed of a flexible soft polyethylene resin. 20 is formed in a taper shape, and is formed thin so that the inclination angle α is 30 °, which is smaller than 55 ° of the opening angle β of the female screw groove 14. For this reason, both engagement protrusions 19 and 20 can express favorable flexibility especially in the front end side. Therefore, the tube cap 16 can be quickly attached to the female screw hole 13 of the nut portion 12. The insertion of the tube cap 16 is completed when both the locking projections 24 provided on the flange portion 18 of the tube cap 16 abut against the outer end surface of the nut portion 12 at the end of the tube body 11.

  As shown in FIGS. 7 and 8, when the tube cap 16 is attached to the female screw hole 13 of the nut portion 12, both the engaging projections 19 and 20 of the tube cap 16 are formed in a spiral shape of the nut portion 12. Is engaged with a predetermined position of the female screw groove 14 formed on the inner surface. At this time, as shown in FIG. 6B, the engaging protrusions 24 of the flange portion 18 are in contact with the outer end surface of the nut portion 12, so that both the engaging protrusions 19 and 20 are accommodated in the female screw groove 14. At the same time, the top edges 19 a and 20 a of both engaging protrusions 19 and 20 come into contact with the inclined surface 14 b of the female thread groove 14. Therefore, even when a force in the pulling direction acts on the tube cap 16, the mounted state can be maintained satisfactorily.

  As shown in FIG. 6A, when the tube cap 16 is removed from the state in which the tube cap 16 is mounted in the female screw hole 13 of the nut portion 12, the grip piece 21 is gripped with a finger and the cap is removed. Pull the body 17 outward in the axial direction. At this time, since the grip piece 21 is provided in the vicinity of the first engagement protrusion 19, the first engagement protrusion 19 in which the pulling force by the grip piece 21 is engaged with the female screw groove 14 of the nut portion 12. It works effectively to release the engagement. At the same time, since the first notch 22 at the position facing the first engagement protrusion 19 is larger than the second notch 23, the cap is closer to the opening end than the first engagement protrusion 19. The main body 17 is easily bent and deformed, and the engagement of the first engagement protrusion 19 is easily released.

  When the first engagement protrusion 19 of the tube cap 16 is disengaged from the female thread groove 14 of the nut portion 12, the cap main body 17 is inclined with respect to the axis of the nut portion 12. The engagement of the second engagement protrusion 20 with the groove 14 is easily released. For this reason, the engagement release of the second engagement protrusion 20 is sequentially performed following the engagement release of the first engagement protrusion 19, and the cap body 17 can be quickly extracted from the female screw hole 13 of the nut portion 12.

The effect obtained by the above embodiment is described collectively below.
(1) The tubular body cap 16 of this embodiment is formed of a flexible soft polyethylene resin, and a pair of engaging protrusions 19 and 20 are formed in the female thread groove 14 of the nut portion 12 on the outer peripheral surface of the cap body 17. It is designed to be engaged. Further, a grip piece 21 is formed to protrude from the flange portion 18 in the vicinity of the first engagement protrusion 19. The first notch 22 on the gripping piece 21 side is formed to be larger than the second notch 23.

  Therefore, when the tube cap 16 is attached to the nut portion 12, the engagement protrusions 19 and 20 are bent and deformed into the female screw groove 14 by fitting the cap body 17 into the female screw hole 13 of the nut portion 12. Engage easily. When the tubular cap 16 is removed from the nut portion 12, the pulling force when the gripping piece 21 is gripped and pulled directly acts on the first engagement protrusion 19. In addition, since the first notch portion 22 on the gripping piece 21 side is formed to be larger than the second notch portion 23, the cap body 17 in the vicinity of the gripping piece 21 due to the pulling force by the gripping piece 21. Is easy to bend. As a result, the first engagement protrusion 19 is easily removed from the nut portion 12, and when the first engagement protrusion 19 is removed, the second engagement protrusion 20 is easily removed from the nut portion 12.

  Therefore, according to the tubular body cap 16 of the present embodiment, it is easy to attach to the nut portion 12 at the end of the tubular body 11, and it is excellent in attachment stability and can be easily removed.

(2) The grip piece 21 is formed in the vicinity of the first engagement protrusion 19 near the opening end of the cap body 17 among the pair of engagement protrusions 19 and 20. For this reason, by pulling the grip piece 21, the engagement of the first engagement protrusion 19 with the female thread groove 14 of the nut portion 12 can be easily released.

(3) The grip piece 21 is provided at the end of the flange portion 18 so as to face the first cutout portion 22. Accordingly, the strength of the gripping piece 21 can be increased, and the deformation of the cap body 17 around the first engagement protrusion 19 is increased toward the first notch portion 22, and the first engagement protrusion 19 with respect to the female screw groove 14 is increased. The engagement can be effectively released.

(4) The engaging protrusions 19 and 20 are formed of tapered engaging protrusions that are thick on the proximal end side and thinner on the distal end side. Therefore, the flexibility of the engagement protrusions 19 and 20 increases toward the distal end side, and the engagement protrusions 19 and 20 can be smoothly engaged with and released from the female thread groove 14 of the nut portion 12.

(5) A locking projection 24 that contacts the outer end surface of the nut portion 12 when the cap main body 17 is fitted into the nut portion 12 is provided on the surface of the flange portion 18 on the cap main body 17 side. For this reason, when the cap body 17 is fitted into the female screw hole 13 of the nut portion 12, the engagement protrusions 19 and 20 can be engaged with the inclined surface 14 b of the female screw groove 14, and the engagement protrusions 19 and 20 with respect to the female screw groove 14. The engagement can be maintained well.

(6) The tube cap 16 is formed by an injection molding method of a soft synthetic resin using an injection mold 27 having a fixed mold 25 and a movable mold 26. Therefore, the configuration of the injection molding die 27 can be simplified without using a slide core or core, and the tube cap 16 can be easily and quickly manufactured by the injection molding method.

<Modification>
In addition, each said embodiment can also be changed and actualized as follows.
As shown in FIG. 10, the grip piece 21 may be formed in an annular shape so as to surround the first engagement protrusion 19 when viewed from the front. In such a configuration, the grip piece 21 can be firmly gripped with a finger, the cap body 17 around the first engagement protrusion 19 can be easily bent, and the female thread groove of the nut portion 12 The engagement of the first engagement protrusion 19 with respect to 14 can be easily released. In this case, the first notch 22 is smaller than that in the above embodiment, but it does not matter.

The positions of the first engagement protrusions 19 and the second engagement protrusions 20 on the outer periphery of the cap body 17 (intervals in the axial direction of the cap body 17) are set so that both the engagement protrusions 19 and 20 It is also possible to set so as to engage with the slope 14b.

The engaging protrusions as the engaging protrusions 19 and 20 may be formed slightly obliquely so as to extend along the female screw groove 14 of the nut portion 12 with respect to the direction orthogonal to the axis of the cap body 17. Good.

-You may arrange | position the position of a pair of said engaging protrusions 19 and 20 from the position which opposes 180 degrees. Further, the number of the engagement protrusions 19 and 20 may be increased to three or more.
The engaging protrusions 19 and 20 can be formed in a shape such as a trapezoidal cross section.

<Appendix>
A technical idea that can be grasped from the above embodiment will be described.
(1) A cap for a tubular body that is formed of a synthetic resin and is attached to a nut portion provided at an end of a tubular body, the cap body formed in a bottomed cylindrical shape and fitted into the nut portion, and an opening thereof A plurality of engaging projections that are engaged with the female thread grooves of the nut portion are provided on the outer peripheral surface of the cap body, and are located in the vicinity of the engaging projections. In the flange portion, a gripping body for releasing the engagement of the engagement protrusion with respect to the female thread groove of the nut portion is protruded, and a notch portion is formed by notching the flange portion at a portion facing the engagement protrusion. A tube cap characterized in that a notch portion on the gripping body side is formed to be larger than other notch portions.

(2) The tubular body cap according to the technical idea (1), wherein the gripping body is formed at a position in the vicinity of the engaging protrusion close to the opening end of the cap body among the engaging protrusions.

(3) The tube cap according to the technical idea (2), wherein the grip body is provided at an end of the flange portion so as to face a notch portion on the grip body side.

(4) From the technical idea (1) to the technical idea (3), the engagement protrusion is configured by an engagement protrusion having a thick base end side and a thinner front end side. The cap for tubular bodies as described in any one of these.

(5) A technical feature of the present invention is that a surface of the flange portion on the cap body side is provided with a locking projection that comes into contact with the outer end surface of the nut portion when the cap body is fitted into the nut portion of the tube body end portion. The tubular body cap according to any one of thought (1) to technical thought (4).

(6) From the technical idea (1) to the technical idea (5), which is formed by an injection molding method of a soft synthetic resin, using an injection mold having a fixed mold and a movable mold. The cap for tubular bodies as described in any one of these.

  DESCRIPTION OF SYMBOLS 11 ... Tube, 12 ... Nut part, 14 ... Female thread groove, 16 ... Cap for pipes, 17 ... Cap main body, 18 ... Flange part, 19 ... 1st engagement protrusion, 20 ... 2nd engagement protrusion, 21 ... A gripping piece as a gripping body, 22 ... a first notch part, 23 ... a second notch part, 24 ... a locking projection, 25 ... a fixed mold, 26 ... a movable mold, 27 ... a mold for injection molding.

Claims (2)

A tube cap that is formed of a synthetic resin and is attached to a nut portion provided at the end of the tube,
A cap main body formed in a bottomed cylindrical shape and fitted into the nut portion, and a flange portion provided at the opening end thereof, are integrally formed, and the outer peripheral surface of the cap main body is provided with a female screw groove of the nut portion. A plurality of engaging protrusions to be engaged are provided, and a grip body for releasing the engagement of the engaging protrusions with respect to the female thread groove of the nut portion is formed on the flange portion in the vicinity of the engaging protrusions. The tube cap according to claim 1, wherein the body is formed at a position in the vicinity of the engaging protrusion close to the opening end of the cap body among the engaging protrusions. A flange portion is formed at a portion facing the plurality of engagement protrusions to form a notch portion, and the gripper is a notch portion facing the engagement protrusion close to the opening end of the cap body among the engagement protrusions. The tube cap according to claim 1, wherein the tube cap is provided at an end of the flange portion so as to face the surface.

Images