JP3431234B2 - Foam mold - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foaming mold for molding a foam such as urethane foam. [0002] Foams such as urethane foams generate gas when molded. Therefore, as a foaming mold used for molding a foam, one having several gas vent holes having a diameter of about 5 mm on the upper surface of the upper mold has been mainly used. However, when the above-mentioned foaming mold was used, not only the unnecessary gas but also the raw material being foamed leaked from the vent hole during foaming. The foam solidified around the vent hole was solidified and adhered to the upper mold in a lump, and the removal operation was difficult. In order to improve such disadvantages, the present applicant has already proposed a foam molding die provided with a plug that fits with a small gap left in the gas vent hole (Japanese Utility Model Laid-Open No. 61-158412). [0003] However, the foam molding die (FIG. 6) has a problem in operation. First, at the time of demolding, the funnel-shaped burr 93 was not always formed only on the foam 94 side. Depending on the shape of the cavity, the type of the foaming material, and the like, the burr 93 also remained in the fitting gap between the gas vent hole 95 and the plug 96. In such a case, the arm 9
7 was lifted to remove the burrs 93 attached to the fitting gap, but the upper mold 99 was only pulled up by the engagement of the guide 98 and was in an unstable state. Arm 97
Is in a loosely inserted state in a long hole 981 provided in the guide 98,
Even when the arm 97 was at the fixed position, the upper mold 99 moved upward (the chain line in FIG. 6). Therefore, when trying to reach the burr by reaching out, the upper mold 99 is pushed with the hand supporting the body or the upper mold 99 is pressed.
The upper die rises when the chest touches the
There was a danger that my hands would be stuffed. An object of the present invention is to solve the above-mentioned problems, and to provide a foaming mold that ensures safety during deburring work and helps prevent accidents. [0005] The foaming mold of the present invention comprises:
An upper mold is hinged to one side edge of the lower mold, and in a foaming mold having a gas vent hole formed in the upper mold upper surface, a handle guide member having a through hole in the upper mold is provided. A hanging body with a corner portion formed at the lower end is swingably hung on an opening / closing handle whose base end portion is supported by the hinge by loose insertion, and when the opening / closing handle is further turned to a predetermined angle, the upper die A stopper for engaging with the corner of the hanging body is fixed to the side so that the engagement prevents the open / close handle from being inserted into the through hole. When foaming is performed using the foaming mold according to the present invention, burrs are generated around the gas vent holes. When burrs are generated in the fitting gap, when the opening / closing handle is lifted to a predetermined angle, the opening / closing handle is loosely inserted into the through-hole, so that the opening / closing handle and the upper mold are slightly separated from each other. At the same time
Since the corner of the hanging body engages with the stopper, the upper die is fixed, and even if an upward force is applied to the upper die, the upper die is prevented from floating. Thus, burrs attached to the gas vent hole can be removed with confidence. Hereinafter, the present invention will be described in detail with reference to examples. 1 to 5 show one embodiment of a foaming mold according to the present invention. FIG. 1 is a cross-sectional view of a foaming mold at the time of foam hardening in which an opening / closing handle is loosely inserted into a through hole, FIG. 2 is an enlarged perspective view around a hanging body, and FIG. 3 is a positional relationship between the hanging body and a stopper when the mold is closed. FIG. 4 is an explanatory view showing the positional relationship between the hanging body and the stopper when the mold is opened, and FIG. 5 is a sectional view of the foaming mold when the mold is opened. Reference numeral 1 denotes a lower mold, and reference numeral 2 denotes an upper mold. The upper mold 2 is joined to the hinge 3 at one side edge of the lower mold 1, and the upper mold 2 is
1 is freely rotatable. When the upper mold 2 is closed, a product-shaped cavity 4 is formed. The upper die 2 has a concave portion 21 for forming a convex portion of the product above the mold matching surface (FIG. 1). A gas vent hole 22 is formed in the upper surface of the upper mold 2 so as to penetrate the cavity 21 toward the cavity 4. Reference numeral 5 denotes a handle guide member provided near the front surface (right side in FIG. 1) of the upper mold 2. The handle guide member 5 includes a plate-like body 51 and a locking member 52. Plate 51
Is provided with a U-shaped notch groove 511 having an open upper end (FIG. 2). The locking member 52 is provided with a slit 521 in the height direction of the peripheral wall of the short pipe, is a split ring having a substantially C-shaped cross section, is rotatable as shown in FIG.
The width of the slit 521 of the locking member 52 is wider than the thickness of a lever 7b of the opening / closing handle 7 described later (FIG. 2). Here, when the slit 521 of the locking member 52 is set downward, the locking member 52
The notch groove 511 forms a vertically long through-hole 53. The lever 7b is loosely inserted into the through hole 53. By the way, after the lever 7b is inserted into the ring of the split ring as the locking member 52, when the locking member 52 is rotated by 180 degrees, the slit 521 comes right above and the lever 7b can be taken out ( (Fig. 6). Reference numeral 6 denotes a stopper comprising an angle 61 having an L-shaped cross section and a strip 62. The stoppers 6 are fixed by welding to gussets 54 provided on both side edges of the plate-like body 51 (FIG. 2). Two band plates 62, 62 are extended from the position of the gusset 54 across the lever 7b and parallel to the lever 7b in the direction of the support shaft 31, and an angle 61 is attached to the tip thereof in a forwardly inclined posture (FIG. 2, FIG. 3). When the upper die 2 is lifted up to a predetermined angle (in this embodiment, less than 40 degrees) around the support shaft 31,
The right angle plane of the angle 61 forms a horizontal plane and a vertical plane, respectively (FIGS. 4 and 5). When this state is reached, a corner 83 of the hanging body 8 described later
Are abutted on both right-angled surfaces. The opening / closing handle 7 comprises a plate-like portion 7a to which a plug 71 fitted to the gas vent hole 22 is fixed, and a rod-like lever 7b welded and fixed above the plate-like portion 7a. The plate-like portion 7 a is a substantially rectangular plate, and its base end 72 is rotatably supported by the support shaft 31 of the hinge 3. When the plate-shaped portion 7 a is placed on the upper mold 2, the plate-shaped portion 7 a has a plug 71 at a position facing the gas vent hole 22. The plug 71 is a cylindrical body having a tapered tip. When the plug 71 is fitted into the gas vent hole 22, gas flows through the fitting gap at a pressure at which the foaming material foams and fills the fitting surface. To escape from the system. However,
The foaming raw material itself is set so that its escape is prevented, and even if it escapes through the gap, it becomes a thin skin. The gap formed by fitting the plug 71 and the gas vent hole 22 is about 1 to 100 microns. The degree of the gap is selected according to the type of the foaming raw material, the target product, and the like. Lever 7
b is a rod-shaped body having a grip 73 at the tip. The lever 7b is loosely inserted into the through hole 53, and is fixed to the plate-like portion 7a at two locations at its root (FIG. 1). Reference numeral 8 denotes a vertically elongated hanging member suspended from a lever 7b near the handle guide member 5. Hanging body 8
The pin 82 is inserted through a hole provided in the lower part of the U-band 81 fixed to the lever 7b, and is pivotally mounted on the pin 82 so as to be swingable. At the lower end of the hanging body 8, a right-angled corner portion 83 is formed. This is because, when the hanging member 8 is engaged with the stopper 6 and the hanging member 8 has no corners 83 and is rounded, the hanging member 8 rotates about the pin 82 as a fulcrum, and the upper die cannot be fixed. . The hanging body 8 is disposed between the handle guide member 5 and the stopper 6 when the opening / closing handle 7 is placed on the upper mold 2 and the plug 71 and the gas vent hole 22 are fitted (FIG. 1). , FIG. 3). When the opening / closing handle 7 is lifted upward to an angle of about 40 degrees, the upper die 2 is also lifted, and an L-shaped stopper 6 having a horizontal surface and a vertical surface is formed.
The corner portion 83 of the hanging body 8 fits into and engages with the body. Reference numeral 91 denotes a U-shaped clamp, and reference numeral 92 denotes a clamp stopper 92. This is for closing the mold when the mold is closed. The symbol a indicates a foam molded product made by the present foam molding die. When the opening / closing handle 7 is loosely inserted into the through-hole 53 and lifted up in the foaming mold thus configured, the upper mold 2 also follows and rotates, thereby ensuring the mold open state. Here, since the opening / closing handle 7 is loosely inserted into the through hole 53, the upper die 2 separates from the opening / closing handle 7 by its own weight and tilts to a position where it is locked to the upper edge of the through hole 53 (FIG. 5). .
Then, the gas vent hole 22 comes off from the plug 71, and a situation is created in which it is easy to remove thin skin-like burrs that have entered the fitting gap between the gas vent hole 22 and the plug 71 during foam molding. On the other hand, in parallel with the above operation, when the opening / closing handle 7 is raised to a predetermined angle (about 40 degrees),
Since the hanging body 8 always keeps the hanging state with the pin 82 as a fulcrum,
The corners 83 are drawn into the angle 61 which is kept vertical and horizontal at an angle of about 40 degrees so as to be sucked. Thus, the hanging body 8 and the stopper 6 are engaged. By making the corner portion 83 exactly contact the right angle portion of the angle 61,
The hanging body 8 suspended swingably around the pin 82 also fits into the angle 61, and the play due to the through hole 53 is eliminated. Due to the formation of the corner portion 83, the contact resistance with the angle 61 is large, and the hanging member 8 engaged in this state does not rotate around the pin 82 as a fulcrum. Therefore, under such engagement, if the opening / closing handle 7 is held at a fixed position by hand or the like, the upper mold 2 cannot be lifted, and the loosely inserted state of the through-hole 53 is prevented, so that the lock is locked. Become. Therefore, as before,
There is no problem that the upper die 2 is loose, and the gas vent hole 2
2. It is possible to concentrate on the deburring of the plug 71. Even if the finger is removed, there is no danger of being pinched by the plug 71. When the opening / closing handle 7 is lowered after the deburring operation is completed, the hanging body 8 and the stopper 6 are engaged with the angle 61 because the radii of curvature around the support shaft 31 are different. The drooping body 8 that has been running tries to jump forward from the angle 61 (to the left in FIG. 4). That is, the hanging body 8 is suspended from the pin 82, and as the rotation angle of the opening / closing handle becomes smaller, the bending with respect to the U-band 81 is corrected, and the hanging body 8 tends to come forward. Also, the angle 61 of the stopper 6 tends to take a forward leaning posture as the angle of the opening / closing handle becomes smaller.
Press from behind. As described above, during the deburring operation performed by lifting the opening / closing handle 7, the plug 71 is removed from the gas vent hole 2.
2 and the upper mold 2 is fixed so that it does not move. On the other hand, when the opening / closing handle 7 is lowered after work, the lock state of the upper mold 2 with respect to the opening / closing handle 7 is automatically released, and the opening / closing handle is The state of loose insertion into the through hole 53 is restored again. In this way, no additional operation or the like for ensuring safety is required, which not only saves labor, but also does not cause a risk of an accident due to forgetting to operate. The operator can engage in the deburring operation during the demolding process with ease. Due to the engagement between the hanging member 8 and the stopper 6, the deburring can be quickly performed only by the lifting operation of the opening / closing handle 7 at the time of removing the mold, and the productivity is not reduced. Here, the deburring operation is performed in a continuous production process, and when burrs adhere to the upper surface of the plate-like portion 7a which is out of reach, the slit 521 is placed directly above the manufacturing end after the manufacture. And the lever 7b is separated from the upper mold 2 to deal with it. The shape, size, and the like of the handle guide member 5, stopper 6, opening / closing handle 7, and hanging body 8 are not limited to those shown in the above-described embodiment, but may vary according to the purpose and application within the scope of the present invention. Can be changed. Further, the angle of the opening / closing handle at which the hanging member 8 and the stopper 6 are engaged is not limited to the numerical value of the embodiment, and various values can be selected. As described above, the foaming mold according to the present invention automatically attaches the hanging member and the stopper, and does not automatically move the upper mold during deburring without any special operation. Since the lock is applied, it is effective in ensuring the safety of deburring work.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a foam mold after foam molding. FIG. 2 is an enlarged perspective view around a hanging body. FIG. 3 is an explanatory diagram showing a positional relationship between a hanging member and a stopper when the mold is closed. FIG. 4 is an explanatory diagram showing a positional relationship between a hanging body and a stopper when the mold is opened. FIG. 5 is a cross-sectional view of the foaming mold when the mold is opened. FIG. 6 is an explanatory sectional view of a conventional technique. [Description of Signs] 1 Lower die 2 Upper die 22 Gas release hole 3 Hinge 5 Handle guide member 53 Through hole 6 Stopper 7 Open / close handle 72 Base end 8 Hanging body 83 Corner

Continuation of the front page (56) References JP-A-2-270516 (JP, A) JP-A-7-68572 (JP, A) JP-A-61-158412 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) B29C 39/00-39/44

Claims (1)

(57) [Claim 1] A foam molding mold in which an upper mold is hinged to one side edge of a lower mold and a gas vent hole is formed in an upper surface of the upper mold.
A handle guide member having a through hole is provided in the upper die, and a hanging body having a corner portion formed at the lower end is swingably hung to an opening / closing handle having a base end portion supported by the hinge by being loosely inserted into the through hole. When the opening and closing handle is further turned to a predetermined angle,
A foam molding die, characterized in that a stopper that engages with the corner of the hanging body is fixed to the upper mold side so that the engagement prevents the open / close handle from being loosely inserted into the through hole.