JP2019034695A - Impact absorption pad, impact absorption pad mold, and manufacturing method of impact absorption pad - Google Patents

Abstract

To provide an impact absorption pad which achieves small misalignment of a frame, an impact absorption pad mold, and a manufacturing method of the impact absorption pad.SOLUTION: An impact absorption pad 1 is attached to a vehicle and includes: a foam 10; and a frame 20 supporting the foam 10. The frame 20 has: an embedded part embedded in the foam 10; and a protruding part 21 protruding from the foam 10. The protruding part 21 is provided with a first supported part 21a supported by a first frame support part of a mold in molding of the impact absorption pad 1. The embedded part is provided with a second supported part 24 supported by a second frame support part of the mold in molding of the impact absorption pad 1. The foam 10 has a hole 14 extending to the second supported part 24 of the frame 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a shock absorbing pad having a foam, a shock absorbing pad molding die, and a method of manufacturing the shock absorbing pad.

As a shock absorbing pad, a technique described in Patent Document 1 is known.
The shock absorbing pad described in Patent Literature 1 includes a pad main body portion and a frame (a plate in the same literature) fixed to the pad main body portion. The pad main body is formed of polyurethane.

JP 2011-121485 A

  By the way, it is desirable that the positional deviation of the frame in the pad main body is small. If the position of the frame is shifted, it may not be attached to the vehicle. An object of the present invention is to provide an impact absorbing pad, an impact absorbing pad molding die, and a manufacturing method of the impact absorbing pad, in which a frame position shift is small.

  (1) An impact absorbing pad that solves the above problem is an impact absorbing pad that is attached to a vehicle, and includes a foam and a frame that supports the foam, and the frame is embedded in the foam. And a protruding portion that protrudes from the foam, and the protruding portion is provided with a first supported portion that is supported by a first frame supporting portion of a mold in forming the shock absorbing pad, The embedded portion is provided with a second supported portion that is supported by the second frame support portion of the mold in the formation of the shock absorbing pad, and the foam extends to the second supported portion of the frame. Has an extending hole.

  The shock absorbing pad having the above configuration is formed by supporting the frame by the embedded portion and the protruding portion of the frame at the time of molding. For this reason, in the shock absorbing pad having the above-described configuration, the positional displacement of the frame with respect to the foam is small as compared with the reference shock absorbing pad formed by supporting the frame only by the protruding portion at the time of molding.

(2) In the shock absorbing pad, the second supported portion is provided with an engaging portion that engages with the second frame supporting portion of the mold when the shock absorbing pad is molded.
The shock absorbing pad having this configuration is formed in a state where the second frame support portion and the engagement portion of the frame are engaged. For this reason, according to the impact absorption pad of the said structure, the position shift of the flame | frame with respect to a foam is small compared with the thing without such an engaging part.

  (3) In the shock absorbing pad, the engagement portion is configured as a through hole, and the hole of the foam further includes a main hole portion reaching the second supported portion of the frame, and a main hole portion. And an insertion part extending through the through hole.

  The shock absorbing pad having this configuration is formed with the second frame support portion and the through hole of the frame engaged with each other. For this reason, according to the impact absorption pad of the said structure, the position shift of the flame | frame with respect to a foam is small compared with the thing without such a hole.

(4) In the shock absorbing pad, the second supported portion is provided with an abutting portion that abuts the second frame supporting portion of the mold on the side of the through hole.
The shock absorbing pad having this configuration is formed in a state where the second frame support portion and the contact portion of the frame are in contact with each other. For this reason, in the direction in which the abutting portion of the frame and the second frame support portion abut, the displacement of the frame with respect to the foam is small in the shock absorbing pad configured as described above.

  (5) In the shock absorbing pad, the engagement portion includes a frame side surface of the second supported portion, and the hole of the foam has a main hole portion reaching the second supported portion, and the main hole A groove portion extending further from the portion and extending along the side surface of the frame in the second supported portion.

  The shock absorbing pad having this configuration is formed in a state where the second frame support portion and the side surface of the frame are engaged. For this reason, the positional displacement of the frame with respect to the foam is small in the shock absorbing pad as compared with the conventional product.

  (6) In the shock absorbing pad, the embedded portion of the frame has a shape without branching, and the second supported portion has a length of the embedded portion from a boundary between the embedded portion and the protruding portion. It is provided in a place farther than 1/4 of the distance.

  According to this structure, the distance between the 1st to-be-supported part in a protrusion part and the 2nd to-be-supported part in an embedding part becomes longer than 1/4 of the length of an embedding part. Thus, by ensuring the distance between the first supported portion and the second supported portion, compared to a case where the distance is shorter than ¼ of the length of the embedded portion from the boundary during molding. The positional deviation of the frame with respect to the foam is reduced. Therefore, as compared with the conventional product, the frame displacement relative to the foam is small in this shock absorbing pad.

  (7) In the shock absorbing pad, the first supported portion is provided at a root of the protruding portion, and the angle of the root of the protruding portion is relative to a line perpendicular to a surface on which the protruding portion protrudes. It is -45 degrees or more and +45 degrees or less.

  When the angle of the first supported part is larger than +45 degrees or smaller than -45 degrees, the first supported part may slide with respect to the first frame support part when closing the mold when the shock absorbing pad is molded. If there is slip, the frame will be deformed. In this regard, according to the above configuration, such slipping is unlikely to occur. Therefore, the deformation of the frame is small in the shock absorbing pad configured as described above compared to the comparative reference example.

  (8) In the shock absorbing pad, the protruding portion has a first fastening portion for fixing the shock absorbing pad to the fixed portion, and the foam fixes the shock absorbing pad to the fixed portion. Having a second fastening portion. According to this configuration, the shock absorbing pad can be fastened to the fixed portion at two locations, the first fastening portion of the protruding portion and the second fastening portion of the foam.

  (9) An impact-absorbing pad molding die that solves the above problems includes a foam and a frame that supports the foam, and the frame protrudes from the embedded portion embedded in the foam and the foam. An impact-absorbing pad molding die having a protrusion and for forming an impact-absorbing pad attached to a vehicle, the first die supporting the frame, and the second die fitted to the first die The first mold includes a first frame support portion that supports the projecting portion of the frame, a second frame support portion that supports the embedded portion of the frame, and one surface of the foam. A first forming portion to be formed, and the second mold includes a second forming portion that forms the other surface of the foam, and the second forming portion includes a second forming main body portion and the second forming portion. 2 The first frame support portion movable with respect to the forming main body portion and the first frame support portion It comprises both a third frame support portion for sandwiching the projecting portion of the frame, and a holding portion for holding the third frame support portion movable.

  According to this configuration, the frame is supported at two locations. Specifically, the protruding portion of the frame is sandwiched between the first frame support portion and the third frame support portion, and the embedded portion of the frame is supported by the second frame support portion. As described above, since the frame is supported not only by the protruding portion but also by the embedded portion, the support of the frame is stabilized as compared with the frame that is not supported by the embedded portion. Thereby, it is possible to mold an impact absorbing pad with a small frame displacement.

  (10) In the shock absorbing pad molding die, the frame has a through hole in the embedded portion, and the second frame support portion of the first mold surrounds the through hole. It has the base part which supports a surrounding part, and the convex part which protrudes from the said base part and penetrates the said through-hole.

  According to this configuration, the convex portion of the second frame support portion is inserted into the through hole of the frame. As a result, the position of the frame is restricted in a direction that intersects the protruding direction of the convex portion. Thus, an impact absorbing pad with a small frame displacement is formed.

  (11) In the shock absorbing pad molding die, the second frame support portion of the first mold includes a base portion that supports the embedded portion, and a second supported portion of the frame that protrudes from the base portion. It has a wall part which contacts the surrounding frame side surface.

  According to this structure, a wall part can be made to contact a frame side surface. As a result, the position of the frame is restricted in a direction intersecting the side surface of the frame. Thereby, an impact absorbing pad with a small frame displacement can be formed.

  (12) In the shock absorbing pad molding die, the third frame support portion is provided so as to be movable with respect to the second die, and is urged so as to press the protruding portion of the frame.

  According to this structure, in the cracking state of a metal mold | die, a 3rd frame support part continues pressing the protrusion part of a flame | frame. When there is no urging structure for the third frame support portion, a gap is formed around the frame in the cracked state. However, according to the above configuration, such a gap can be narrowed. Thereby, the leak of the foam bead at the time of filling can be suppressed.

  (13) A method of manufacturing the shock absorbing pad that solves the above-described problem is a method of manufacturing the shock absorbing pad using any one of the above shock absorbing pad molding dies. A first step of disposing a frame; a second step of disposing the first mold and the second mold such that a gap is formed between the first mold and the second mold; Filling the pre-expanded beads into the filling space formed between the first mold and the second mold, and bringing the first mold and the second mold closer to each other; after filling the pre-expanded beads; And a fourth step of foaming the pre-expanded beads.

  According to this configuration, since the shock absorbing pad molding die having the above-described structure is used, it is possible to suppress the displacement of the frame with respect to the foam.

  According to the shock absorbing pad, the shock absorbing pad molding die, and the shock absorbing pad manufacturing method, it is possible to form a shock absorbing pad with a small frame displacement.

The perspective view of an impact-absorbing pad. The perspective view of a flame | frame. The perspective view of the impact-absorbing pad seen from the viewpoint different from the viewpoint of FIG. The side view of a shock absorption pad. The schematic diagram of an impact-absorbing pad molding die. The fragmentary perspective view of an impact-absorbing pad molding die. The partial perspective view of the 1st type. The partial perspective view of the 2nd type. Sectional drawing which follows the 9-9 line of FIG. The perspective view of the 1st type | mold with which the flame | frame is arrange | positioned. The perspective view of the impact-absorbing pad of a modification. The perspective view of a 1st type | mold about the impact-absorbing pad molding die of a modification.

<Shock absorbing pad>
The shock absorbing pad 1 will be described with reference to FIGS.
The shock absorbing pad 1 is attached to the vehicle body. For example, it is attached to the inside of the side door, the inside of the back door, or the like. The shock absorbing pad 1 disperses the shock or reduces the force transmitted to the inside of the shock absorbing pad 1 when the shock absorbing pad 1 is deformed by receiving an external force.

As shown in FIG. 1, the shock absorbing pad 1 includes a foam 10 and a frame 20 that supports the foam 10.
The foam 10 is formed of a thermoplastic foam resin. Examples of the thermoplastic foamed resin include polystyrene resins, polyolefin resins, mixed resins of polyolefin resins and polystyrene resins, polyester resins, polycarbonate resins, and the like. Examples of polyolefin resins include polypropylene resins and polyethylene resins. Examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, or polylactic acid.

As shown in FIG. 2, the frame 20 includes an embedded portion 23 embedded in the foam 10 and a protruding portion 21 protruding from the foam 10. The protrusion 21 is exposed from the foam 10.
The protruding portion 21 of the frame 20 is provided with a first supported portion 21a. The first supported portion 21 a is a portion that is supported by a first frame support portion 33 (see below) of the impact absorbing pad molding die 30 when the impact absorbing pad 1 is molded.

  The frame 20 has higher rigidity than the foam 10. The frame 20 is formed of a metal such as iron, stainless steel, aluminum, or an aluminum alloy. The frame 20 may be formed of a highly rigid resin.

  The protruding portion 21 is provided with a first fastening portion 22 for fixing the shock absorbing pad 1 to the fixed portion. The fixed part indicates a part to which the frame 20 is attached. For example, the fixed part is provided on the base member of the side door. The 1st fastening part 22 is comprised as a hole which a volt | bolt, a rivet, etc. penetrate, for example, and is fixed to a to-be-fixed part by fastening members, such as a volt | bolt.

The protrusion angle of the protrusion 21 is preferably configured as follows.
As shown in FIG. 4, the angle A between the line L1 perpendicular to the side surface of the foam 10 where the protrusion 21 protrudes and the line L2 along the protrusion 21 is −45 degrees or more and +45 degrees or less. It is preferable that More preferably, the angle A is not less than −30 degrees and not more than +30 degrees. More preferably, the angle is not less than −20 degrees and not more than +20 degrees. The reason why the angle A is set to such a size is that, since the angle A is small, a mold portion (a third frame support portion described later) that holds the protruding portion 21 when the shock absorbing pad 1 is molded. This is because the deviation of 39) can be suppressed. By suppressing the displacement, the frame 20 is stably fixed during molding, and distortion in the foam 10 due to the displacement of the frame 20 in the shock absorbing pad 1 can be suppressed.

  A second supported portion 24 is provided in the embedded portion 23 of the frame 20. The second supported portion 24 is a portion that is supported by a second frame support portion 34 (see later) of the impact absorbing pad molding die 30 when the impact absorbing pad 1 is molded. The second supported portion 24 is exposed. The second supported portion 24 is provided with an engaging portion 24a. The engaging portion 24a engages with the second frame support portion 34 when the shock absorbing pad 1 is molded. The engaging portion 24a is configured as, for example, a through hole 24b.

  The second supported portion 24 is preferably provided at a location far from the boundary 20 a between the embedded portion 23 and the protruding portion 21. For example, as in the present embodiment, when the embedded portion 23 of the frame 20 has a shape without branching, the second supported portion 24 extends from the boundary 20 a between the embedded portion 23 and the protruding portion 21 to the length of the embedded portion 23. It is preferable to be provided at a position farther than 1/4 of the distance.

  The second supported portion 24 is provided with a contact portion 24d next to the through hole 24b. The abutting portion 24 d abuts on the second frame support portion 34 of the impact absorbing pad molding die 30 when the impact absorbing pad 1 is molded. The contact part 24d is configured to be flat, for example.

  As shown in FIGS. 3 and 4, the foam 10 has a hole 14. The hole 14 extends from the surface of the foam 10 to the embedded portion 23 of the frame 20. The bottom of the hole 14 is constituted by the frame 20. The hole 14 of the foam 10 includes a main hole portion 14a that reaches the second supported portion 24 of the frame 20, and an insertion portion 14b that extends further from the main hole portion 14a and passes through the through hole 24b of the frame 20. The hole 14 is formed by a second frame support portion 34 (see below) that supports the second supported portion 24 of the frame 20 when the shock absorbing pad 1 is molded.

  The foam 10 has a second fastening portion 15 for fixing the shock absorbing pad 1 to the fixed portion. The second fastening portion 15 is configured as a hole through which a bolt, a rivet, a plastic fastening member, or the like is inserted, for example. The arrangement of the second fastening portion 15 can be freely set. In the present embodiment, the second fastening portion 15 is provided on the opposite side of the protruding portion 21 of the frame 20 in the foam 10.

  In the present embodiment, the shock absorbing pad 1 can be fixed to the fixed portion at two locations, the first fastening portion 22 of the frame 20 and the second fastening portion 15 of the foam 10. By fixing the shock absorbing pad 1 at two places, the mounting state is stabilized as compared with the case where the shock absorbing pad 1 is fixed at one place.

  In the present embodiment, one end of the frame 20 is exposed as the protruding portion 21, and the other end is embedded in the foam 10. One of the first fastening portion 22 and the second fastening portion 15 is provided on the protruding portion 21 of the frame 20, and the other one is provided on the foam 10. With this structure, the length of the frame 20 can be shortened compared to a structure in which both ends of the frame 20 protrude from the foam 10, and as a result, the shock absorbing pad 1 can be lightened.

<Shock absorbing pad mold>
The shock absorbing pad mold 30 will be described with reference to FIGS.
The shock absorbing pad molding die 30 molds the shock absorbing pad 1 having the above configuration. As described above, the frame 20 of the shock absorbing pad 1 has the through hole 24b as the engaging portion 24a. The impact absorbing pad 1 is formed by crack filling of pre-expanded beads and foaming of the pre-expanded beads using the impact absorbing pad molding die 30.

  As shown in FIG. 5, the shock absorbing pad molding die 30 includes a first die 31 and a second die 36 that fits into the first die 31. In the present embodiment, the first mold 31 is configured as a male mold, and the second mold 36 is configured as a female mold.

  FIG. 6 shows a portion B of the shock absorbing pad molding die 30 shown in FIG. FIG. 7 shows a part included in the first mold 31 among the parts shown in FIG. 6. FIG. 8 shows a portion included in the second mold 36 among the portions shown in FIG. 6. FIG. 9 is a cross-sectional view of the portion shown in FIG. FIG. 10 shows a state in which the frame 20 is arranged on the first mold 31.

As shown in FIGS. 9 and 10, the first mold 31 supports the frame 20.
As shown in FIG. 7, the first mold 31 includes a first forming portion 32 that forms one surface of the foam 10 (hereinafter, “first surface 11”, see FIG. 4), and a protruding portion of the frame 20. 21, and a second frame support portion 34 that supports the embedded portion 23 of the frame 20. The first mold 31 includes a main body portion 31a having a first forming portion 32 and an extension portion 31b extending from the main body portion 31a. The first frame support portion 33 is provided on the extension portion 31b. The first frame support portion 33 has a contact portion 33 a that contacts the frame 20. The extension 31b extends in the mold closing direction DA. The first frame support portion 33 is provided at the root of the extension portion 31b. The root indicates a portion close to the first forming portion 32 in the extension portion 31b.

  The second frame support part 34 is provided in the first forming part 32. The second frame support part 34 projects in a direction along the mold closing direction DA. The second frame support part 34 forms the hole 14 of the foam 10.

  The second frame support part 34 includes a base part 34a that supports a peripheral part 24c surrounding the through hole 24b of the frame 20, and a convex part 34b that protrudes from the base part 34a and passes through the through hole 24b.

  As shown in FIG. 8, the second mold 36 includes at least a second forming portion 37 that forms the other surface (hereinafter, the second surface 12) of the foam 10. The 2nd surface 12 shows the surface on the opposite side to the 1st surface 11 of the foam 10 (refer FIG. 4). In the present embodiment, the second forming portion 37 includes a second forming main body portion 38, a third frame support portion 39, and a holding portion 41 that holds the third frame support portion 39 movably.

  The second forming main body portion 38 is formed with a concave portion 38a into which the third frame support portion 39 is fitted. The mold in which the second formation main body portion 38 and the third frame support portion 39 are combined forms the second surface 12 of the foam 10.

  The third frame support part 39 holds the frame 20 together with the first frame support part 33 of the first mold 31 when the mold is closed. Further, the third frame support portion 39 is movable with respect to the second formation main body portion 38.

  The third frame support portion 39 includes a surface forming portion 39 a for forming a part of the second surface 12 of the foam 10, a sliding contact portion 39 b, and a contact portion 39 c that contacts the frame 20. The surface forming portion 39a fits into the recess 38a of the second forming main body portion 38. The sliding contact portion 39 b extends from the surface forming portion 39 a and comes into sliding contact with the guide portion 41 c of the holding portion 41. The third frame support portion 39 is movable with respect to the second forming main body portion 38 by the sliding contact portion 39b being guided by the guide portion 41c in the direction along the mold closing direction DA. The contact portion 39 c is positioned so as to face the contact portion 33 a of the first frame support portion 33 of the first mold 31. The third frame support portion 39 is biased by the coil spring 40b so as to be directed to the first die 31 in the die closing direction DA. The contact portion 39c of the third frame support portion 39 contacts the frame 20 in the cracking state and the mold closing state.

  The holding part 41 of the second mold 36 holds the third frame support part 39 as described above. The holding part 41 includes a fitting part 41 a that fits into the extension part 31 b of the first mold 31 and a support part 41 b that supports the third frame support part 39.

  The support portion 41 b includes a guide portion 41 c that guides the sliding contact portion 39 b of the third frame support portion 39. The guide part 41c accommodates the sliding contact part 39b. A pole 40a penetrating the support portion 41b is inserted into the guide portion 41c. The tip end of the pole 40 a is connected to the third frame support portion 39. A coil spring 40b supported by the pole 40a is accommodated in the guide portion 41c. The coil spring 40b urges the third frame support portion 39 so that the third frame support portion 39 presses the frame 20 from the cracking state to the mold closing state (described later).

Next, a method for manufacturing the shock absorbing pad 1 using the shock absorbing pad molding die 30 will be described.
The first mold 31 and the second mold 36 move relative to each other. As the mold state, a mold closed state, which is a state when molding a foam molded product, a cracking state in which a gap (this gap is also referred to as “cracking”) is provided between both molds, and the frame 20. There is a mold open state in which the first mold 31 and the second mold 36 are spaced apart from each other so that the arrangement can be performed.

In the first step, the shock absorbing pad molding die 30 is placed in the mold open state, and the frame 20 is disposed on the first die 31.
In the second step, one of the first mold 31 and the second mold 36 is moved so that a gap is formed between the first mold 31 and the second mold 36. A mold 36 is arranged. That is, the first mold 31 and the second mold 36 are brought into a cracking state. The gap is preferably large enough to prevent the pre-expanded beads from falling out.

  In the third step, the pre-expanded beads are filled in the filling space between the first mold 31 and the second mold 36. And the distance of the 1st type | mold 31 and the 2nd type | mold 36 is brought close, and the impact-absorbing pad molding die 30 is put into a mold-closed state. The pre-expanded beads are prepared by pre-expanding the expanded beads.

In the fourth step, after pre-expanded beads are filled and the mold is closed, steam is put into the mold and the pre-expanded beads are foamed with steam.
Thereafter, the first mold 31 and the second mold 36 are cooled, and the molded product is taken out.

The operation of the shock absorbing pad 1 will be described.
The shock absorbing pad 1 is formed with the frame 20 supported at two places during molding. What is formed in a state where the frame 20 is supported only by the projecting portion 21 at the time of molding (hereinafter referred to as “reference shock absorbing pad”) with respect to the foam 10 due to the displacement of the frame 20 at the time of molding. Thus, the position of the frame 20 varies. That is, the positional accuracy of the frame 20 with respect to the foam 10 is low. In this regard, the shock absorbing pad 1 according to the embodiment is formed in a state where the frame 20 is supported at two places at the time of molding, and the positional displacement of the frame 20 with respect to the foam 10 is a reference shock absorbing pad. Smaller than

Thus, since the shock absorbing pad 1 has a high positional accuracy of the frame 20, it can be appropriately fixed at a predetermined position with respect to the fixed portion.
When the position accuracy of the frame 20 is low, when the frame 20 is fixed to the fixed portion, a part of the foam 10 may protrude from a predetermined area in the fixed portion. When such protrusion of the foam 10 occurs, the end face of the foam 10 comes into contact with the base member of the vehicle and is deformed. As a result, stress is applied to the fixed portion via the shock absorbing pad 1, There is a risk of promoting the deterioration of the fixing portion (hereinafter referred to as “first problem”). Further, when the position accuracy of the frame 20 is low, when the frame 20 is fixed to the fixed part, a part of the foam 10 is not arranged at a predetermined position of the fixed part, so that a part of the foam 10 is There is a risk of being fixed without touching where it should come into contact. In such a case, the buffering function of the shock absorbing pad 1 cannot be sufficiently exhibited (hereinafter referred to as “second problem”). On the other hand, since the shock absorbing pad 1 according to the present embodiment has a high positional accuracy of the frame 20, the occurrence of the first problem and the second problem can be suppressed.

The effect of this embodiment will be described.
(1) The frame 20 of the shock absorbing pad 1 has an embedded portion 23 embedded in the foam 10 and a protruding portion 21 protruding from the foam 10. The protruding portion 21 is provided with a first supported portion 21a. The embedded portion 23 is provided with a second supported portion 24. The foam 10 has a hole 14 that extends to the second supported portion 24 of the frame 20.

  The shock absorbing pad 1 is formed by supporting the frame 20 with the embedded portion 23 and the protruding portion 21 of the frame 20 at the time of molding. For this reason, the positional displacement of the frame 20 with respect to the foam 10 in the shock absorbing pad 1 is small as compared with a reference shock absorbing pad formed by supporting the frame 20 only by the protrusion 21 at the time of molding.

  Further, in the shock absorbing pad 1 of the present embodiment, the number of protrusions 21 of the frame 20 is one. This configuration has the following advantages over conventional products. In the conventional product, both ends of the frame 20 are protruded from the foam 10 for the purpose of supporting the frame at two locations during molding. On the other hand, in the shock absorbing pad 1 of the present embodiment, only one end of the frame 20 protrudes from the foam 10 and the other end is embedded in the foam 10. With this configuration, the frame 20 is shorter than the conventional product. For this reason, the impact-absorbing pad 1 of this embodiment is lightweight compared with a conventional product.

(2) The second supported portion 24 is provided with an engaging portion 24 a that engages with the second frame support portion 34 of the impact absorbing pad molding die 30 when the impact absorbing pad 1 is molded.
The shock absorbing pad 1 having this configuration is formed with the second frame support portion 34 and the engagement portion 24a of the frame 20 engaged with each other. For this reason, according to the shock absorbing pad 1 having the above-described configuration, the positional displacement of the frame 20 with respect to the foam 10 is small as compared with the case without the engaging portion 24a.

  (3) The engaging portion 24a is configured as a through hole 24b. The hole 14 of the foam 10 includes a main hole portion 14a that reaches the second supported portion 24 of the frame 20, and an insertion portion 14b that extends further from the main hole portion 14a and passes through the through hole 24b. The shock absorbing pad 1 having this configuration is formed with the second frame support portion 34 and the through hole 24b of the frame 20 engaged with each other. For this reason, according to the shock absorbing pad 1 having the above-described configuration, the positional displacement of the frame 20 with respect to the foam 10 is small as compared with a case without such a hole 14.

(4) The second supported portion 24 is provided with an abutting portion 24d on the side of the through hole 24b, with which the second frame supporting portion 34 of the shock absorbing pad molding die 30 abuts.
The shock absorbing pad 1 having this configuration is formed with the second frame support portion 34 and the contact portion 24d of the frame 20 in contact with each other. For this reason, the shock absorbing pad 1 having the above configuration has a small positional displacement of the frame 20 with respect to the foam 10 in the direction in which the contact portion 24d of the frame 20 and the second frame support portion 34 are in contact.

  (5) The embedded portion 23 of the frame 20 is configured in a shape without branching. The second supported portion 24 is preferably provided at a position farther from the boundary 20 a between the embedded portion 23 and the protruding portion 21 than ¼ of the length of the embedded portion 23. In addition, the length of the embedded portion 23 indicates the length of the center line C (see FIG. 2) of the embedded portion 23.

  According to this configuration, the distance between the first supported portion 21 a in the protruding portion 21 and the second supported portion 24 in the embedded portion 23 is longer than ¼ of the length of the embedded portion 23. . If the distance between the two portions supported by the frame 20 is shortened, the position shift of the end portion of the frame 20 may be increased. In this regard, as in the above configuration, the distance between the first supported portion 21a and the second supported portion 24 is secured, so that the distance is equal to the length of the embedded portion 23 from the boundary 20a during molding. Compared to the case where the length is shorter than / 4, the positional displacement of the frame 20 with respect to the foam 10 is reduced. Therefore, according to the shock absorbing pad 1 having such a structure, the positional displacement of the frame 20 with respect to the foam 10 is small.

  (6) The 1st supported part 21a is provided in the root of the protrusion part 21, and the angle A of the root of the protrusion part 21 is -45 degree | times with respect to the line L1 perpendicular | vertical to the surface where the protrusion part 21 protrudes. The angle is preferably +45 degrees or less.

  According to this configuration, when the angle of the first supported portion 21a is larger than +45 degrees or smaller than −45 degrees (hereinafter, these examples are referred to as “comparative reference examples”), the shock absorbing pad 1 is used. There is a possibility that the first supported portion 21 a slides with respect to the first frame support portion 33 when the mold is closed at the time of molding. When such slip occurs, the frame 20 is deformed. In this regard, according to the above configuration, such slipping is unlikely to occur. Therefore, the deformation of the frame 20 in the shock absorbing pad 1 is small compared to the comparative reference example. Here, the deformation of the frame 20 indicates that the angle of the first supported portion 21a of the projecting portion 21 is out of the design specified angle range (angle range including dimensional tolerance).

  (7) The protruding portion 21 of the frame 20 has a first fastening portion 22 for fixing the shock absorbing pad 1 to the fixed portion. The foam 10 has a second fastening portion 15 for fixing the shock absorbing pad 1 to the fixed portion.

  When there is a fastening portion only at the projecting portion 21 of the frame 20, when the shock absorbing pad 1 is fixed to the fixed portion, the shock absorbing pad 1 is gradually rotated by the vibration of the fixed portion so that the shock absorbing pad 1 is the original one. There is a possibility that the position is greatly deviated. According to the above configuration, the shock absorbing pad 1 can be fastened to the fixed portion at the two locations of the first fastening portion 22 of the protruding portion 21 and the second fastening portion 15 of the foam 10. Thereby, it is suppressed that the shock absorption pad 1 shifts | deviates greatly from the original attachment position.

  (8) The shock absorbing pad molding die 30 includes a first die 31 that supports the frame 20 and a second die 36 that fits into the first die 31. The first mold 31 includes a first frame support portion 33 that supports the protruding portion 21 of the frame 20, and a second frame support portion 34 that supports the embedded portion 23 of the frame 20. The second forming portion 37 of the second mold 36 includes a second forming main body portion 38 and a third frame support portion 39. The third frame support part 39 is movable with respect to the second forming main body part 38 and sandwiches the protruding part 21 together with the first frame support part 33.

  According to this configuration, the frame 20 is supported at two locations. Specifically, the protruding portion 21 of the frame 20 is sandwiched between the first frame support portion 33 and the first frame support portion 33. The embedded portion 23 of the frame 20 is supported by the second frame support portion 34. As described above, since the frame 20 is supported not only by the protruding portion 21 but also by the embedded portion 23, the support of the frame 20 is more stable than that in which the frame 20 is not supported by the embedded portion 23. Thereby, it is possible to form the shock absorbing pad 1 with a small positional deviation of the frame 20.

  In particular, when the pre-expanded beads are foamed with steam as described in the embodiment, the position of the frame 20 may be shifted due to the pressure of the steam. Deviation is suppressed.

  (9) The shock absorbing pad molding die 30 forms the foam 10 on the frame 20 provided with the through holes 24b. The second frame support portion 34 of the first mold 31 supports a portion of the frame 20 including the through hole 24b. The second frame support portion 34 includes a base portion 34a that supports a peripheral portion 24c surrounding the through hole 24b, and a convex portion 34b that protrudes from the base portion 34a and passes through the through hole 24b.

  According to this configuration, the convex portion 34 b of the second frame support portion 34 is inserted into the through hole 24 b of the frame 20. As a result, the position of the frame 20 is regulated in a direction that intersects the protruding direction of the convex portion 34b. Thereby, the shock absorbing pad 1 with a small positional deviation of the frame 20 is formed.

  (10) In the shock absorbing pad molding die 30, the third frame support portion 39 is provided so as to be movable with respect to the second die 36 and is urged so as to press the protruding portion 21 of the frame 20. .

  According to this configuration, the third frame support portion 39 continues to press the protruding portion 21 of the frame 20 in the cracking state of the shock absorbing pad molding die 30. When there is no urging structure for the third frame support portion 39, a gap is formed around the frame 20 in the cracked state. According to the above configuration, such a gap can be narrowed. Thereby, the leak of the foam bead at the time of filling can be suppressed.

  (11) The manufacturing method of the shock absorbing pad 1 includes the following configuration. In the first step, the frame 20 is disposed on the first mold 31. In the second step, the first mold 31 and the second mold 36 are arranged so that a gap is formed between the first mold 31 and the second mold 36. In the third step, the pre-expanded beads are filled in the filling space, and the distance between the first die 31 and the second die 36 is reduced. In the fourth step, after the pre-expanded beads are filled, the pre-expanded beads are expanded. According to this configuration, since the shock absorbing pad molding die 30 having the above structure is used, the positional deviation of the frame 20 with respect to the foam 10 can be suppressed.

  By the way, in this embodiment, mounting | wearing of the flame | frame 20 in the 1st type | mold 31 in a 1st process is performed as follows. That is, the protrusion 33b (see FIG. 10) on the first frame support portion 33 of the first mold 31 is engaged with the side surface of the frame 20, and the convex portion 34b of the second frame support portion 34 of the first mold 31 is engaged. The frame 20 is mounted on the first mold 31 by engaging the through hole 24 b of the frame 20. In this mounting, the frame 20 is positioned at a predetermined position of the first mold 31 by the frictional force.

  On the other hand, the frame 20 may be displaced in the mold closing direction DA when the foam 10 is molded. For example, when steam is injected into the mold in forming the foam 10, the frame 20 may float from the first frame support portion 33 or the second frame support portion 34 due to the pressure of the steam. In order to avoid such a situation, a magnet may be attached to the base part 34a of the first frame support part 33 or the second frame support part 34. The magnet of the base part 34a attracts the contact part 24d of the frame 20. Thereby, the frame 20 can be set more stably.

<Modification>
The configuration of the shock absorbing pad 1 is not limited to the configuration of the above embodiment. Hereinafter, some modifications of the shock absorbing pad 1 will be described.

  -As FIG. 11 shows, the impact-absorbing pad 1x concerning a modification has the following structure. The engaging portion 24 a of the frame 20 includes a frame side surface 25 in the second supported portion 24. The hole 44 of the foam 10 has a main hole portion 44 a that reaches the second supported portion 24, and a groove portion 44 b that extends further from the main hole portion 44 a and extends along the frame side surface 25 in the second supported portion 24. According to this structure, as shown in FIG. 12, the frame 20 is positioned in the width direction of the frame 20 on the frame side surface 25 at the time of molding.

  The shock absorbing pad 1x having this configuration is formed with the second frame support portion 34 of the shock absorbing pad molding die 30 and the frame side surface 25 engaged with each other. For this reason, according to the shock absorbing pad 1x having the above-described configuration, the positional displacement of the frame 20 with respect to the foam 10 is small as compared with the case without such an engagement structure.

  As shown in FIG. 12, the shock absorbing pad molding die 30 forming the shock absorbing pad 1x has the following configuration. The second frame support part 34 of the first mold 31 includes a base part 34 a that supports the embedded part 23, and a wall part that protrudes from the base part 34 a and contacts the frame side surface 25 around the second supported part 24 of the frame 20. 34x. Further, preferably, the first mold 31 has a wall portion 34 y that contacts the end surface of the protruding portion 21 of the frame 20.

  According to this configuration, the wall portion 34 x can be brought into contact with the frame side surface 25. As a result, the position of the frame 20 is regulated in the direction intersecting the frame side surface 25 (the width direction of the frame 20). Thereby, it is possible to form an impact absorbing pad with a small positional deviation of the frame 20.

  In the above embodiment, the first mold 31 is configured as a male mold and the second mold 36 is configured as a female mold, but any of them may be a male mold. Specifically, the first mold 31 can be configured as a female mold, and the second mold 36 can be configured as a male mold. In this case, the first mold 31 as a female mold is provided with the first frame support part 33 and the second frame support part 34 configured to support the frame 20. Further, in the shock absorbing pad 1 formed by such a shock absorbing pad molding die 30, the hole 14 extends from the surface formed by the female mold toward the frame 20.

  A ... Angle, C ... Center line, DA ... Direction, L1 ... Line, L2 ... Line, 1 ... Shock absorbing pad, 1x ... Shock absorbing pad, 10 ... Foam, 11 ... First surface, 12 ... Second surface, DESCRIPTION OF SYMBOLS 14 ... Hole, 14a ... Main hole part, 14b ... Insertion part, 15 ... 2nd fastening part, 20 ... Frame, 20a ... Boundary, 21 ... Projection part, 21a ... 1st supported part, 22 ... 1st fastening part, 23 ... Embedded portion, 24 ... Second supported portion, 24a ... Engagement portion, 24b ... Through hole, 24c ... Peripheral portion, 24d ... Abutting portion, 25 ... Frame side surface, 30 ... Shock absorbing pad molding die, 31 ... 1st type | mold, 31a ... Main-body part, 31b ... Extension part, 32 ... 1st formation part, 33 ... 1st frame support part, 33a ... Contact part, 33b ... Projection, 34 ... 2nd frame support part, 34a ... stand Part, 34b ... convex part, 34x ... wall part, 34y ... wall part, 36 ... second type, 37 ... second forming part, 3 ... 2nd formation main-body part, 38a ... Concave part, 39 ... 3rd frame support part, 39a ... Surface formation part, 39b ... Sliding contact part, 39c ... Contact part, 40a ... Pole, 40b ... Coil spring, 41 ... Holding part, 41a ... fitting part, 41b ... support part, 41c ... guide part, 44 ... hole, 44a ... main hole part, 44b ... groove part.

Claims (13)

A shock absorbing pad attached to a vehicle,
A foam, and a frame that supports the foam,
The frame has a buried portion embedded in the foam and a protruding portion protruding from the foam, and the protruding portion is supported by a first frame support portion of a mold in molding of the shock absorbing pad. A first supported portion is provided, and the embedded portion is provided with a second supported portion that is supported by a second frame support portion of the mold in forming the shock absorbing pad,
The foam has a hole extending to the second supported portion of the frame. The shock absorbing pad according to claim 1, wherein the second supported portion is provided with an engaging portion that engages with the second frame supporting portion of a mold when the shock absorbing pad is molded. The engaging portion is configured as a through hole, and the hole of the foam has a main hole portion that reaches the second supported portion of the frame, and an insertion that further extends from the main hole portion and passes through the through hole. The impact-absorbing pad according to claim 2. The impact absorbing pad according to claim 3, wherein the second supported portion is provided with a contact portion that contacts the second frame support portion of the mold, beside the through hole. The engaging portion includes a frame side surface of the second supported portion, and the hole of the foam further extends from the main hole portion to the second supported portion, and extends to the second supported portion. The shock absorbing pad according to claim 2, further comprising a groove portion along a side surface of the frame in the support portion. The embedded portion of the frame has an unbranched shape, and the second supported portion is separated from a boundary between the embedded portion and the projecting portion by more than 1/4 of the length of the embedded portion. The impact-absorbing pad according to any one of claims 1 to 5, wherein the shock-absorbing pad is provided at a place. The first supported portion is provided at a root of the protruding portion, and an angle of the root of the protruding portion is −45 degrees or more and +45 degrees or less with respect to a line perpendicular to a surface where the protruding section protrudes. The impact-absorbing pad according to any one of claims 1 to 6. The protrusion has a first fastening part for fixing the shock absorbing pad to the fixed part, and the foam has a second fastening part for fixing the shock absorbing pad to the fixed part. The impact-absorbing pad according to any one of claims 1 to 7. A foam and a frame for supporting the foam, the frame having an embedded portion embedded in the foam and a protruding portion protruding from the foam to form an impact absorbing pad attached to a vehicle A shock absorbing pad molding die for
A first mold that supports the frame; and a second mold that fits into the first mold. The first mold includes a first frame support that supports the protrusion of the frame; The second mold has a second frame support part that supports the embedded part and a first forming part that forms one surface of the foam, and the second mold forms a second surface that forms the other surface of the foam. A second forming body, and a second forming body that is movable with respect to the second forming body and sandwiches the protruding portion of the frame together with the first frame support. An impact-absorbing pad molding die, comprising: a frame support part; and a holding part that movably holds the third frame support part. The frame is provided with a through hole in the embedded portion,
The said 2nd frame support part of a said 1st type has a base part which supports the surrounding part surrounding the said through-hole, and a convex part which protrudes from the said base part and penetrates into the said through-hole. Shock absorption pad mold. The second frame support part of the first type includes a base part that supports the embedded part, and a wall part that protrudes from the base part and contacts a frame side surface around the second supported part of the frame. Item 10. A shock-absorbing pad molding die according to Item 9. The said 3rd frame support part is provided so that a movement with respect to the said 2nd type | mold, and is urged | biased so that the protrusion part of the said frame may be pressed. Shock absorbing pad molding mold. A method for producing a shock absorbing pad that forms a shock absorbing pad using the shock absorbing pad molding die according to any one of claims 9 to 12,
A first step of disposing a frame on the first mold;
A second step of arranging the first mold and the second mold such that a gap is formed between the first mold and the second mold;
A third step of filling a pre-expanded bead into a filling space formed between the first mold and the second mold to reduce the distance between the first mold and the second mold;
And a fourth step of foaming the pre-expanded beads after filling with the pre-expanded beads.