JP3038468B2 - Mold for foam molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for foaming a cushion material for a seat, for example, and more particularly to a lower mold for molding the surface of the cushion and a back surface of the cushion material which can be opened to the lower mold. In a foaming mold having an upper mold for molding the side and a middle mold that is openable to the upper mold and provides a backing sheet on one side of the cushion material,
The set pin used when providing the backing sheet is
The present invention relates to a foam molding die which can be easily separated from the backing sheet integrally formed on the back surface of the foam molded cushion material.

[0002]

2. Description of the Related Art An occupant seat used for a driver's seat or a passenger seat of an automobile is basically composed of a cushion material such as urethane foam and a pipe frame inserted into the cushion material. As shown in FIG. 9, the cushion member 10 on the back side of the occupant seat has a large accommodating portion 10a formed on the back side thereof, and the pipe frame 11 is inserted into the accommodating portion 10a. The pipe frame 11 is provided with a plurality of elastic steel wires 13 arranged at required intervals, and is inserted into the cushion material 10 to reinforce the cushion material 10 and to reduce the occupant seat. It is used for connection with a seat section (not shown) to be constituted.

Further, a backing sheet 12 for increasing the rigidity of the cushion material itself is provided in advance on a back surface portion where the pipe frame 11 is provided as a pre-process for inserting the pipe frame 11. This backing sheet 12
Is a member made of, for example, felt or the like.
As shown in FIG. 5, the cushion member 10 is formed to have substantially the same dimensions as the accommodation portion 10a. This backing sheet 12
The reason for this is that not only is the rigidity of the cushion material itself increased as described above, but also that the steel wire 13 disposed on the pipe frame 11 directly hits the back side of the cushion material 10. Lumber 10
There is also to prevent damage to the.

[0004] The backing sheet 12 is attached to a foaming mold (hereinafter referred to as "molding mold") 14 shown in FIG. That is, the molding die 14 comprises a lower die 16 for molding the front side of the seat cushion material 10 and an external pivot point HP.
And an upper mold 18 that can be opened and closed with respect to the lower mold 16 through the lower mold 16 to form the back surface of the cushion material 10 and the pivot point HP
And a middle mold 20 that can be opened and closed while maintaining a required time difference with respect to the upper mold 18 through the upper mold 18. As shown in the figure, the upper die 18 includes a plate 22 that rotates around a pivot point HP as a fulcrum and a connecting member 2 that is provided from the vicinity of the rotation end of the plate 22 to the middle die 20.
3 is connected. On the upper surface of the plate 22, a bar-shaped handle 24 extending from the rotating end of the plate 22 by a required length is disposed, and this is a shutting guide installed along the conveying direction of the molding die 14. It is in contact with 25.

In the middle mold 20, a receiving portion 10a for disposing the pipe frame 11 is formed on the back side of the cushion member 10, and the backing sheet 12 is integrally formed on the back side of the cushion member 10. It is to be molded. A set pin 26 slightly projecting toward the lower die 16 when the molding die 14 is closed is provided in a portion of the middle die 20 close to the pivot point HP. That is, the set pin 26 is formed in a so-called “mushroom” shape as shown in the figure, and the vicinity of one end of the backing sheet 12 set on the middle die 20 is pushed in through the fingers of the worker. It is. As a result, the backing sheet 12 is set to the middle mold 20 so as not to fall off. The middle mold 20 and the upper mold 18 are connected via connecting means 28 as shown in the figure. That is, the connecting means 28 is provided in the
An arm 27 provided on a surface facing the plate 22 and a connecting rod 29 provided on a surface facing the plate 22 of the middle die 20.
It is composed of The connecting rod 29 is pivotally attached to the middle die 20 so as to be rotatable, and has an elongated hole 29a formed in the longitudinal direction thereof. In the vicinity of the lower end of the arm 27, an engaging rod 33 is provided in the horizontal direction, and the engaging rod 33 is engaged with the elongated hole 29a of the connecting rod 29.

When the cushioning material 10 is molded by the molding die 14, as described above, the backing sheet 12 is provided along the surface of the middle die 20 to be molded, and the pivot support point is provided. The portion close to the HP is inserted into a set pin 26 provided on the middle die 20 and set. Thereafter, the urethane stock solution is injected into the bottom surface of the lower mold 16 by an injector (not shown), and then the middle mold 20 is closed to a predetermined position with respect to the lower mold 16 as shown in FIG. By closing the upper mold 18, the mold is closed, and the foaming reaction of the urethane stock solution proceeds. Here, the urethane stock solution is composed of, for example, a mixed stirring liquid of a first liquid containing a polyether polyol as a main component, a foaming agent, a catalyst, a crosslinking agent, and the like, and a second liquid made of polyisocyanate. Then, when the cream time at which the reaction mixture is saturated elapses, the urethane stock solution becomes a urethane foam while foaming and fills the inside of the molding die 14.

When the foam molding is completed, the upper mold 18 is opened to the lower mold 16 as shown in FIG. 13, and the middle mold 20 is connected to the upper mold 18 by the connection means 28. I have. Therefore, while the engaging rod 33 of the arm 27 constituting the connecting means 28 slides along the long hole 29a of the connecting rod 29, the middle die 20 is stopped with respect to the lower die 16. I have. From this state, upper mold 1
By rotating the middle mold 20 from the lower mold 16 by rotating the 8, the cushion material 10 having a required shape with the housing portion 10 a formed on the back side is formed as shown in the figure. The upper die 18 and the middle die 20 are opened and closed by a handle 24 disposed on an upper surface of the plate 22.
It is configured to be automatically performed by being guided by the shutting guide 25 with the movement of the shutter 4.
Although the above description is based on the so-called open injection method, a closed injection method in which all the molds are closed may be used.

[0008]

The cushion material 10 which has been subjected to the foam molding is removed from the middle mold 20 by a manual operation of an operator.
As shown in FIG. 14, the vicinity of the lower end inserted into the set pin 26 is foam-formed so as to include the set pin 26. Therefore, when releasing the cushion material 10, it is necessary to pull out the set pin 26 from both the cushion material 10 and the backing sheet 12 to release the set pin 26.
The peripheral surface is strongly pressed by the foaming force of the cushion material 10. Further, since the shape of the set pin 26 itself is formed in a “mushroom” shape as described above, urethane foam enters between the set pin 26 and the backing sheet 12 after foam molding. This results in a so-called undercut shape. For this reason, after the foaming of the urethane, the cushion material 10 which is a foam molded product is difficult to come off from the middle mold 20, so that there is a problem that excessive labor and time are required for removing the cushion material 10 from the mold.

[0009]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks inherent in the prior art, and has been proposed in order to solve the problem suitably. In a foaming mold having a lower mold, an upper mold, and a middle mold for foam molding, a set pin for setting the backing sheet is configured to rotate together with the upper mold, and the upper mold is rotated after molding the cushion material. With movement,
It is an object of the present invention to provide a foam molding die capable of easily releasing a cushion material from a middle mold by releasing a set pin from a backing sheet formed integrally with the cushion material in advance.

[0010]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and appropriately achieve the intended object, the present invention provides a lower mold for molding the front side of a cushioning material for a seat and an external pivot point. The upper mold, which can be opened and closed with respect to the lower mold, forms the back side of the cushion material, and can be opened with a required time difference with respect to the upper mold via the pivot point, and the backing sheet is formed of the cushion. A middle mold integrally molded on the back side of the material, and a foam molding mold including a set pin for setting the backing sheet at a required position of the middle mold prior to molding the cushion material, A nest that constitutes a part of the middle mold at the time of closing and exposes a part of the backing sheet set in the middle mold to the inside of the mold is disposed so as to be openable and closable together with the upper mold. Point to the lower mold when closed A required number of the set pins are attached to the release end, and when the upper mold is opened after foam molding, the nest is opened together with the upper mold, and the set pins are removed from the backing sheet before the cushion material is released. It is configured to be detached.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a mold for foam molding according to the present invention. The same members as those described in the section of the related art are designated by the same reference numerals.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
Are arranged. That is, the nest 30 is
8 constitutes a part of the middle mold 20 when the middle mold 20 is closed.
The backing sheet 12 is set on the back surface of the cushioning material 10 by allowing a part of the backing sheet 12 to face the molding die 14, and when the upper mold 18 is closed, The side surface shape is shaped like an arrow so as to face the lower mold 16. The nest 30 is mounted via a support member 32 at a position close to a pivot point HP on which the plate 22 is supported, so that the nest 30 can be opened and closed together with the upper mold 18. . In addition, the middle size 20 facing the nest 30
Is a bulging portion 20a bulging into the upper die 18 as shown in the figure.
Is formed, and an insertion hole 20b that allows insertion of the sagittal portion of the insert 30 is formed in the bay insertion portion 20a. When the upper mold 18 and the middle mold 20 are closed during the foam molding, the peripheral portion of the insert 30 comes into contact with the insertion hole 20b so that the sagittal portion of the insert 30 can face the foam molding area. Has become.

When the nest 30 is closed, the lower mold 16 is closed.
The required number of the set pins 26 are attached to the sagittal end portion which faces the. The set pin 26 is formed in a “mushroom” shape as described above, and is inserted into the vicinity of one end of the backing sheet 12 so that the backing sheet 12 is set on the middle mold 20. It has become. After the urethane stock solution is foamed and filled in the molding area defined by the lower mold 16, the upper mold 18, and the middle mold 20, as shown in FIG. 2, the backing sheet 12 is integrally formed on the back surface of the urethane foam. At the same time, the head of the set pin 26 is covered by urethane foam.

The upper die 18 and the middle die 20 are connected by the connecting means 28. That is, as shown in FIG. 1 and FIG.
It is basically constituted by a fixed arm 34 provided on the upper die 18 on a surface facing the upper die 18 and an engaging hook 36 rotatably provided on the middle die 20 on a surface facing the upper die 18. ing. The fixed arm 34 is a plate-shaped member disposed on the surface of the plate 22 forming the upper mold 18 facing the middle mold 20 and facing the middle mold 20. As shown in FIG. 24 are attached at positions separated by a required distance along a direction orthogonal to the extending direction of the reference numeral 24. The fixed arm 34 is connected by a connecting bar 34a whose lower end is located in the horizontal direction.

The hook 36 provided on the middle die 20
Is a plate material formed in a substantially rectangular shape, and as shown in the figure, at a portion located inside the fixed arm 34, a flange 38 fixed to the upper surface of the middle die 20 and a flange 38 The support shafts 40 are opposed to each other at positions separated by a required distance via the support shaft 40. Further, a cutout 36a formed in a size that can be engaged with the connection bar 34a of the fixed arm 34 is provided in a recess in the longitudinal direction of the hook 36. As shown in FIG. 4, the notch 36a has an engagement position when the connection bar 34a is engaged.
The hook 36 is set so as to be located closer to the rotation end of the molding die 14 than the support shaft 40 is. As a result, as described later, when the upper die 18 and the lower die 16 are closed, the hook 36 is detached from the connecting bar 34a of the fixed arm 34. Further, an endless chain 42 is loosely wound between the support shaft 40 and the connecting bar 34a of the fixed arm 34, and functions as described later. The length of the hook 36 is determined by the upper die 18 and the middle die 2.
When the endless chain 42 is pulled between the support shaft 40 and the connecting bar 34a by opening the opening 0, the vicinity of the open end of the hook 36 is set to a size that abuts on the connecting bar 34a. .

[0016]

Next, the actual use of the foaming mold according to the embodiment will be described. This molding die 14 is shown in FIG.
As shown in FIG. 5, the upper die 18 is opened at a position where the upper die 18 is rotated further upward by a required angle with respect to the middle die 20.
In this state, the hook 36 disposed on the
Is in contact with a connection bar 34a of a fixed arm 34 attached to the plate 22 of the upper die 18. By rotating the middle mold 20 in the direction of the upper mold 18 from this position, the middle mold 20 comes into contact with the upper mold 18 and the notch 36a recessed in the hook 36 engages with the connecting bar 34a. Thereby, the middle mold 20 and the upper mold 18 are held in contact with each other, and the upper mold 18 and the middle mold 20 can be rotated substantially integrally before foam molding.

Further, as shown in FIG. 5, the nest 30 disposed on the plate 22 constituting the upper
The abutment 20a of the middle die 20 is abutted through the insertion hole 20b formed in the cushioning member 20 to form the molding surface of the cushion material 10 as described above. And the backing sheet 1
2 contacts the molding surface of the middle mold 20 in this state.
The lower end of the backing sheet 12 is inserted through the set pin 26 provided in the insert 30. In this setting, the inserted and supported part is set by the set pin 2
After being brought into contact with the head of No. 6, this portion is inserted and supported by pressing with a finger or the like.

Next, the middle mold 20 on which the backing sheet 12 is set is turned integrally with the upper mold 18 and closed as shown in FIG. The hook 36 has been engaged with the connecting bar 34a of the fixed arm 34 up to this point. By further clamping the upper die 18, the hook 36 slightly pressed by the connecting bar 34a As shown in (1), the molding die 14 is rotated toward the open end by its own weight and detaches from the connecting bar 34a. Also, the urethane stock solution injected into the lower mold 16 before closing foams over time in this molding space.

The molding die 14 which has been subjected to the foam molding is shown in FIG.
The upper die 18 is opened to the lower die 16 as shown in FIG. At this time, the upper mold 18 also rotates with respect to the middle mold 20 because the hook 36 of the middle mold 20 is separated from the connecting bar 34a as described above. In addition, the nest 30
As shown in FIG. 2B, the upper mold 18 is opened with the rotation of the upper mold 18 and is separated from the middle mold 20 before the cushion material 10 is removed. That is, the set pin 26 attached to the sagittal open end of the insert 30 is
The urethane foam is separated from the backing sheet 12 covered with the urethane foam and the urethane foam. Since the set pin 26 is released by a so-called "leverage" effect accompanying the rotation of the upper die 18, the set pin 26 is released from the backing sheet 12 and the urethane foam by a slight force.

After the upper die 18 is rotated to a required position, the endless chain gently wound around the connecting bar 34a of the fixed arm 34 and the support shaft 40 disposed on the middle die 20. Due to 42, the middle mold 20 rotates together with the upper mold 18. Then, as shown in FIG.
When the mold 8 and the middle mold 20 are fully opened, the urethane foam as the cushion material 10 is removed from the middle mold 20.

[0021]

As described above, according to the foaming mold according to the present invention, the set pin for attaching the backing sheet is disposed separately from the middle mold and in the nest that rotates together with the upper mold. did. Thus, when the upper mold is opened to the lower mold after foam molding, the set pins are previously detached from the backing sheet formed on the back surface of the urethane foam as a cushion material, and the cushion material is removed from the middle mold. It has excellent advantages such as easy demolding.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire foam molding die according to a preferred embodiment of the present invention in a partially cutaway state.

FIG. 2 is a longitudinal sectional front view showing a state in which a nest attached to an upper mold is detached from a foam molded product and a backing sheet in the foam molding die of the present invention.

FIG. 3 is an enlarged view of a main part showing a means for connecting an upper mold and a middle mold in the foam molding die of the present invention.

FIG. 4 is an enlarged front view showing an engagement hook constituting a connection means between the upper mold and the lower mold in the foam molding mold of the present invention.

FIG. 5 is a vertical sectional front view showing a state in which a backing sheet is attached to a middle mold in the foam molding die of the present invention.

FIG. 6 is a longitudinal sectional front view showing a state in which an upper mold and a middle mold are closed to a lower mold in the foam molding mold of the present invention.

FIG. 7 is a longitudinal sectional front view showing a state in which the upper mold after the foam molding is rotated with respect to the lower mold in the foam molding die of the present invention.

FIG. 8 is a longitudinal sectional front view showing a state in which, in the foam molding die of the present invention, the foam molded article is removed from the fully opened upper mold together with the fully opened middle mold.

FIG. 9 is a longitudinal sectional side view showing a foam molded product obtained by a foam molding die.

FIG. 10 is a front view of the backing sheet covered on the back side of the foaming mold closed.

FIG. 11 is a longitudinal sectional front view showing a conventional foaming mold in an open state.

FIG. 12 is a longitudinal sectional front view showing a state in which an upper mold and a middle mold are closed in a conventional foaming mold.

FIG. 13 is a longitudinal sectional front view showing a state in which an upper mold and a middle mold after foam molding are opened in a conventional foam molding die.

FIG. 14 is a longitudinal sectional view of an essential part showing a state in which a foam molded product is detached from a middle mold in a conventional foam molding die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cushion material 12 Backing sheet 16 Lower type 18 Upper type 20 Medium type 26 Set pin 30 Nesting HP pivot point

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI B29L 9:00 31:58 (58) Investigated field (Int.Cl. ⁷ , DB name) B29C 33/00-33/76 B29C 39/00-39/44

Claims (2)

(57) [Claims] 1. A lower mold (16) for molding a surface side of a seat cushion material (10) and said lower mold (1) through an external pivot point (HP).
6) that can be opened and closed with respect to the upper die (18) for molding the back side of the cushion material (10), and the upper die via the pivot point (HP).
(18) can be opened while holding a required time difference, and a backing sheet (12) is integrally molded on the back side of the cushion material (10), and the cushion material (10 Prior to molding, in a foaming mold having a set pin (26) for setting the backing sheet (12) at a required position of the middle mold (20), when closing the upper mold (18) The backing sheet (12) which constitutes a part of the middle size (20) and is set in the middle size (20).
A nest (30) that exposes a part of the mold inside the mold, the upper mold (18)
A required number of the set pins (26) are attached to an open end facing the lower mold (16) when the nest (30) is closed, and the upper mold (18) after foam molding is formed. ), The nest (30) is opened together with the upper mold (18), and the set pin (26) is lined with a backing sheet (12) prior to releasing the cushion material (10).
A foam molding die characterized by being detached from the mold. 2. The foam molding die according to claim 1, wherein the insert (30) is set at a position close to a pivot point (HP) to which the middle die (20) is connected.