JP6105268B2 - Waterproof stopper - Google Patents

Description

  The present invention relates to a waterproof plug.

Some connectors for mounting a terminal to which a wire is connected to a terminal accommodating chamber of the housing include a waterproof plug for watertight sealing between the lead-out wire and the housing (see, for example, Patent Document 1).
As shown in FIG. 7, the connector 501 has a contact support 507 that is assembled from an upper portion 503 and a lower portion 505. The upper portion 503 and the lower portion 505 include a first insertion chamber 509 and a second insertion chamber 511 that are aligned with each other. Between the upper portion 503 and the lower portion 505 of the contact support 507, a mat seal 513 that is a waterproof plug is disposed. The mat seal 513 has a large number of first openings 515 (wire insertion holes) through which contact pins (terminals) are inserted and second openings 519 through which the locking arms 517 are inserted through the front and back surfaces.

By the way, this type of waterproof plug is integrally molded using a molding die 527 including a plurality of first molds 521, second molds 523, and third molds 525, for example, as shown in FIG. 8. The
The first mold 521 is provided with a pin 531 that forms a wire insertion hole 529 of the waterproof plug 537, and the receiving portion 533 of the third mold 525 and the tip of the pin 531 come into contact with each other when the molds are aligned. Thereby, the electric wire insertion hole 529 which is a through hole is formed (refer FIG. 11). The pin 531 of the first mold 521 has an uneven outer peripheral surface in which a large diameter portion and a small diameter portion are alternately formed in the axial direction in order to form an inner peripheral lip. A large number of books are vertically and horizontally arranged on the molding surface.

A groove portion 535 is provided on the inner peripheral surface of the second mold 523, and an outer peripheral lip 539 for stopping water between the housing and the waterproof plug 537 is formed by the groove portion 535 (see FIG. 11). The groove portion 535 is formed in an uneven shape on the inner peripheral surface of the second mold 523 and is provided in multiple stages (three stages in the illustrated example) in the mold release direction.
The receiving portions 533 provided in the third mold 525 are arranged so as to be in contact with the tips of the pins 531.

Then, as shown in FIG. 9, by injecting a molten elastic material such as silicon rubber into the cavity defined by the first mold 521, the second mold 523, and the third mold 525 that have been matched with each other. A waterproof plug 537 is injection-molded by a molding die 527.
At the time of product removal, as shown in FIG. 10, first, the mold 527 is released from the first mold 521 from the second mold 523 and the third mold 525 that hold the product.
Thereafter, as shown in FIG. 11, the third mold 525 is released from the second mold 523. Thereby, the waterproof plug 537 which is a product remains in the second mold 523, and finally the waterproof plug 537 is taken out from the second mold 523.

JP 2007-287589 A

  However, when the multi-pole waterproof plug 537 is molded, there are a large number of pins 531 in the first mold 521. Therefore, when the first mold 521 is released, as shown in FIG. 531 may cause the product waterproof plug 537 to bite into the first mold 521 and make it difficult to remove the product. As shown in FIG. 11, if the waterproof plug 537 is held by the second mold 523, the waterproof plug 537 can be easily taken out without damaging the sealing surface, but as shown in FIG. When the waterproof plug 537 is held by the undesired first mold 521, the sealing surface (such as the surface of the outer peripheral lip 539) must be grasped and removed from the first mold 521. There is a risk of injury. Further, if it is not known which of the first to third molds 521, 523, 525 holds the waterproof plug 537, it becomes an obstacle to automating the mold release.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a waterproof plug that can prevent a product from biting into an undesired mold during molding.

The above object of the present invention is achieved by the following configuration.
(1) It has a plurality of electric wire insertion holes penetrating in the plate thickness direction of the main body portion formed in a flat plate shape, and an outer peripheral lip protruding from the outer peripheral surface of the main body portion, and penetrates the electric wire insertion hole A waterproof plug formed by a molding die composed of a plurality of dies with a direction as a die-cutting direction, wherein each surface of the front and back surfaces of the main body is recessed in the thickness direction of the main body. A waterproof plug, wherein the formed bottomed hole is provided near the outer peripheral lip.

According to the waterproof plug of the above Paragraph (1), on each side of front and rear surfaces of the main body, a bottomed hole which is formed recessed in the thickness direction of the main body is provided in the vicinity of the circumferential lip. Such a waterproof plug includes a first mold having a pin that forms a wire insertion hole, a second mold that forms an outer peripheral lip, and a third mold that forms a part of the wire insertion hole. Molded by a mold. Since the bottomed holes are respectively provided on front and rear surfaces of the main body portion, lightening pins for molding the bottomed holes are provided in the first mold and the third mold. When the first mold, the second mold, and the third mold are combined with each other and the integral molding is performed, since the meat removal pin is provided near the outer peripheral lip, the outer peripheral lip and the bottomed hole of the product are The meat portion in between is sandwiched between the inner surface of the second mold and the meat removal pin.
When the first mold is released from the second mold and the third mold at the time of taking out the product, the product forms the outer peripheral lip of the second mold by the meat removal pin of the first mold. It is pressed so as not to separate from the groove part to be. That is, the outer peripheral lip is caught in the groove portion of the second mold. In this state, the meat removal pin of the first mold to be released is pulled out from the bottomed hole with low friction while pressing the meat part against the groove part. On the other hand, the meat removal pin of the third mold also presses the meat portion against the groove portion of the second mold by the meat removal pin, so that the outer peripheral lip is caught in the groove portion, and the product is the second mold and the third mold. It is held with high holding power by the mold. As a result, the product has a larger holding force due to the outer peripheral lip being caught in the groove than the frictional force when the first mold is released from the product, and is held by the second mold and the third mold. Will remain.
Next, the third mold is released from the second mold holding the product. Also in this case, the product is held by the second mold by the meat part being pressed by the meat removal pin of the third mold and the outer peripheral lip being caught by the groove part. Thereby, it becomes possible to leave the product in the second mold, and it is possible to prevent the product from biting into the first mold and the third mold which are not desired at the time of mold release.

(2) The waterproof plug according to (1) above, wherein the depth of the bottomed hole is equal to or greater than the width of the nearest outer peripheral lip.

  According to the waterproof plug having the configuration (2), the meat portion of the product can be more reliably sandwiched between the meat removal pin forming the bottomed hole and the groove portion of the inner surface of the second mold.

  The waterproof plug according to the present invention can prevent the product from biting into an undesired mold during molding.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

It is a longitudinal cross-sectional view of the waterproof plug which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view of the connector with which the waterproof stopper shown in FIG. 1 was mounted | worn. (A) is a decomposition | disassembly side view of the shaping die which shape | molds the waterproof plug shown in FIG. 1, (b) is FF sectional drawing of (a). (A) is a side view at the time of shaping | molding of the shaping die shown in FIG. 3, (b) is GG sectional drawing of (a). 4A is a side view of the molding die shown in FIG. 4 when the first mold is released, FIG. 4B is a cross-sectional view taken along the line H-H in FIG. 4A, and FIG. It is. (A) is the side view at the time of the 3rd metal mold release of the shaping die shown in FIG. 5, (b) is II sectional drawing of (a). It is a disassembled perspective view of a connector provided with the conventional waterproofing stopper. (A) is a decomposition | disassembly side view of the shaping die which shape | molds the conventional waterproof stopper, (b) is AA sectional drawing of (a). (A) is a side view at the time of shaping | molding of the shaping die shown in FIG. 8, (b) is BB sectional drawing of (a). (A) is a side view at the time of normal mold release of the 1st metal mold | die shown in FIG. 9, (b) is CC sectional drawing of (a). (A) is a side view at the time of the 3rd metal mold release of the shaping die shown in Drawing 10, (b) is a DD sectional view of (a). (A) is the side view at the time of the defective mold release of the 1st metal mold | die shown in FIG. 10, (b) is EE sectional drawing of (a).

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a mat seal 11 that is a waterproof plug according to an embodiment of the present invention has a main body 13 formed in a rectangular flat plate shape by an elastic material such as silicon rubber. In the main body 13, a plurality of electric wire insertion holes 15 penetrates in the plate thickness direction and is provided vertically and horizontally. A multi-stage (three-stage in the illustrated example) outer peripheral lip 19 projects in parallel on the outer peripheral surface 17 of the main body 13.

  Further, a bottomed hole 23 formed in the front and back surfaces of the main body 13 of the mat seal 11 so as to be recessed in the thickness direction (vertical direction in FIG. It is provided side by side near. The bottomed hole 23 has a depth a greater than or equal to the width dimension b of the nearest outer peripheral lip 19 (see FIG. 5C).

  The mat seal 11 of the present embodiment is attached to, for example, a connector 25 shown in FIG. The connector 25 is a female connector to which a terminal 27 that is a female terminal is attached, but may be a male connector to which a male terminal is attached.

  The connector 25 has a plurality of terminal accommodating chambers 31 formed inside a synthetic resin housing 29. The terminal accommodating chamber 31 has a male terminal receiving port 33 on the mating connector fitting side of the housing 29 and an opposite side. The female terminal mounting opening 35 opens. A lance 37 protrudes from the terminal accommodating chamber 31, and the lance 37 locks the terminal 27 inserted into the terminal accommodating chamber 31 to restrict detachment from the terminal accommodating chamber 31. An electric wire 39 is connected to the terminal 27, and the electric wire 39 is led out of the housing 29 from the terminal accommodating chamber 31 through the female terminal mounting opening 35.

  In the housing 29, a mat seal accommodating portion 41 is formed behind the female terminal mounting opening 35. A mat seal cover 45 in which a plurality of electric wire outlet holes 43 are formed is mounted behind the mat seal housing portion 41 of the housing 29. The mat seal 11 inserted into the mat seal accommodating portion 41 is attached to the mat seal accommodating portion 41 so as not to be detached by attaching the mat seal cover 45 to the housing 29.

The electric wire 39 connected to the terminal 27 is inserted into the electric wire insertion hole 15 of the mat seal 11 and then led out of the connector 25 from the electric wire outlet hole 43 of the mat seal cover 45. The electric wire 39 led out to the outside is watertightly sealed with the mat seal 11 by an inner peripheral lip formed in the electric wire insertion hole 15.
Further, the mat seal 11 is watertight between the outer peripheral surface 17 and the mat seal accommodating portion 41 by the outer peripheral lip 19. This prevents water from entering the terminal accommodating chamber 31 from the outside of the connector 25 through the electric wire 39. Of course, since the bottomed hole 23 provided in the main body 13 of the mat seal 11 is not a through hole, water does not enter from the bottomed hole 23.

The mat seal 11 of the present embodiment described above has a plurality of first molds 47 (molds), second molds 49 (molds), and third molds 51 with the penetration direction of the wire insertion holes 15 as the mold release direction. It is integrally molded by a molding die 21 composed of (mold).
The first mold 47 is provided with a pin 55 that forms the wire insertion hole 15 of the mat seal 11, and the receiving portion 57 of the third mold 51 and the tip of the pin 55 abut when the mold is aligned. Thereby, the electric wire insertion hole 15 which is a through hole is formed. The pin 55 of the first mold 47 has an uneven outer peripheral surface in which a large diameter portion and a small diameter portion are alternately formed in the axial direction in order to form the inner peripheral lip 53. A large number of pieces are vertically and horizontally arranged on the molding surface.

A groove portion 59 is provided on the inner peripheral surface of the second mold 49, and an outer peripheral lip 19 that stops water between the housing 29 and the mat seal 11 is formed by the groove portion 59. The groove portion 59 has an uneven shape on the inner peripheral surface of the second mold 49 and is provided in multiple stages (three stages in the illustrated example) in the mold release direction.
The receiving portions 57 provided in the third mold 51 are arranged so as to be in contact with the tips of the pins 55.

When the bottomed hole 23 is provided on the front and back surfaces of the main body 13 as in the mat seal 11 of the present embodiment, the lightening pins 61a and 61b for forming the bottomed hole 23 are the first mold 47 and the third mold. It is provided with the mold 51. The lightening pins 61a provided in the first mold 47 are vertically arranged along the long side direction (left-right direction in FIG. 3A) of a large number of pins 55 arranged vertically and horizontally in a rectangular shape. . Further, the lightening pins 61b provided on the third mold 51 are vertically arranged along the long side direction (left and right direction in FIG. 3A) of a large number of receiving portions 57 arranged in a rectangular shape vertically and horizontally. Has been.
The lightening pins 61a and 61b in the present embodiment are formed in a flat quadrangular prism shape, and have the same cross-sectional shape in the axial direction and a smooth peripheral surface. It should be noted that the lightening pins 61a and 61b are not limited to a rectangular column shape, and may take various shapes such as a columnar shape and a polygonal column shape.

Next, the operation of the mat seal 11 having the above configuration will be described.
In the mat seal 11 according to the present embodiment, a plurality of bottomed holes 23 arranged along the outer peripheral surface 17 of the main body 13 are provided near the outer peripheral lip 19 on the front and back surfaces of the main body 13. Here, the front and back surfaces of the main body 13 refer to the upper and lower planes of the rectangular flat plate-shaped main body 13 in which the outer peripheral lip 19 is formed on the outer peripheral surface 17.

  Such a mat seal 11 includes a first mold 47 having a pin 55 that forms the wire insertion hole 15, a second mold 49 that forms the outer peripheral lip 19, and a first mold that forms a part of the wire insertion hole 15. It is integrally molded by a molding die 21 composed of three die 51. When the bottomed hole 23 is provided on the front and back surfaces of the main body portion 13 as in the present embodiment, the lightening pins 61 and 61 b for forming the bottomed hole 23 are provided on the first mold 47 and the third mold 51. Provided.

  Then, as shown in FIG. 4, by injecting a molten elastic material such as silicon rubber into a cavity defined by the first mold 47, the second mold 49, and the third mold 51 that are matched with each other. When the injection molding of the mat seal 11 is performed by the molding die 21, the meat removal pins 61 and 61 b are provided near the outer peripheral lip 19, so that the gap between the outer peripheral lip 19 and the bottomed hole 23 of the product is The meat portion 63 is sandwiched between the inner surface of the second mold 49 and the meat removal pins 61 and 61b. Further, in the mat seal 11 of the present embodiment, since the depth a of the bottomed hole 23 is not less than the width dimension b of the nearest outer peripheral lip 19, the lightening pins 61 and 61 b that form the bottomed hole 23. And the groove portion 59 on the inner surface of the second mold 49, the meat portion 63 of the product can be more securely sandwiched.

  As shown in FIG. 5, in the molding die 21, when the product is taken out, first, the first die 47 is released from the second die 49 and the third die 51 that hold the product. When the first mold 47 is released, the product is separated from the groove 59 on the inner surface of the mold of the second mold so that the meat portion 63 forms the outer peripheral lip 19 by the meat removal pin 61a of the first mold 47. It is pressed so as not to. That is, the outer peripheral lip 19 is caught in the groove 59 of the second mold. In this state, the thinning pin 61 a of the first mold 47 to be released is pulled out from the bottomed hole 23 with low friction while pressing the meat portion 63 against the groove portion 59.

  On the other hand, the meat removal pin 61b of the third mold 51 also presses the meat portion 63 against the groove 59 of the second die 49 by the meat removal pin 61b. The outer peripheral lip 19 is caught in the groove 59 from the relationship of thickness d (c <d), and the product is held by the second mold 49 and the third mold 51 with a high holding force (see FIG. 5C). As a result, the product has a greater holding force due to the outer peripheral lip 19 being hooked in the groove 59 than the frictional force when the first mold 47 is released from the product, and the second mold 49 and the third mold. The mold 51 remains held.

  Next, as shown in FIG. 6, the third mold 51 is released from the second mold 49 holding the product. Also in this case, the product is pressed against the groove 59 of the second mold 49 by the meat extraction pin 61b of the third mold 51 and the outer peripheral lip 19 is caught by the groove 59 so that the second mold 49 Will remain retained. As a result, it is possible to leave the product in the second mold 49 until the end, and it is possible to prevent the product from biting into the undesired first mold 47 and the third mold 51 at the time of mold release. The mat seal 11 held by the second mold 49 can be easily taken out without damaging the sealing surface. Further, since the mat seal 11 is always held by the second mold 49 at the time of mold release, it is also suitable for automation of mold release.

  In the present embodiment, the lightening pins 61 and 61 b are provided on both the first mold 47 and the third mold 51. Thereby, the product weight of the mat seal 11 can be reduced. Further, by providing the mat seal accommodating portion 41 and the mat seal cover 45 with positioning protrusions that fit into the bottomed hole 23, the mat seal 11 can be prevented from being displaced, and the mat seal 11 can be easily assembled. be able to.

  In the present embodiment, the thinning pins 61 and 61b are provided on both the first die 47 and the third die 51, but the thinning pins 61a of the first die 47 can be omitted. Also by this, the holding force of the second mold 49 to the product can be increased by the meat removal pin 61b provided in the third mold 51, so that the product can be prevented from biting into the first mold 47. . In this case, the mat seal 11 as a product has the bottomed hole 23 only on one surface. That is, at least one or more bottomed holes 23 in the mat seal 11 of the present embodiment may be provided on at least one of the front and back surfaces of the main body 13, and a plurality of bottom holes 23 are necessarily provided on the front and back surfaces. There is no.

Therefore, according to the mat seal 11 according to the present embodiment, it is possible to prevent the product from biting into the undesired first mold 47 and the third mold 51 during molding.
In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

11 ... Mat seal (waterproof stopper)
DESCRIPTION OF SYMBOLS 13 ... Main-body part 15 ... Electric wire insertion hole 17 ... Outer peripheral surface 19 ... Outer peripheral lip 21 ... Molding die 23 ... Bottomed hole 47 ... First die (die)
49 ... Second mold (mold)
51. Third mold (mold)
a: Bottom hole depth b: Width

Claims (2)

It has a plurality of wire insertion holes penetrating in the plate thickness direction of the main body portion formed in a flat plate shape, and an outer peripheral lip protruding from the outer peripheral surface of the main body portion. A waterproof plug molded by a molding die composed of a plurality of dies as a pulling direction,
The waterproof plug according to claim 1, wherein a bottomed hole formed to be recessed in the thickness direction of the main body portion is provided near the outer peripheral lip on each of the front and back surfaces of the main body portion.   2. The waterproof plug according to claim 1, wherein the depth of the bottomed hole is equal to or greater than the width of the nearest outer peripheral lip.

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