Grab handle

Abstract

A grab handle comprising: a hollow injection-molded member in which a handle main element (1) is manufactured by a gas-assisted injection molding process; comprising a unit of a support portion (10) and concave stowing portions (2, 3) provided to be connected to both longitudinal ends of the support portion (10) through intervening curved portions (14); and fixed to a fixing surface side (6) by fixing tools (4, 5) stored in the two stowing portions (2, 3), wherein each of the storage sections (2, 3) is divided by: an inner side wall (20, 30) and an outer side wall (21, 31) which are opposite to each other in a longitudinal direction; an upper wall (22, 32) which connects upper sides of the two side walls (20, 21, 30, 31) on one side of a curved section (14); a lower wall (23, 33) which connects lower sides of the two side walls (20, 21, 30, 31) on an end side; and a bottom wall (25, 35) which connects the inner and outer side walls (20, 21, 30, 31) and the upper and lower walls (22, 23, 32, 33) on an outer surface side, and the upper wall (22, 32) has: an inclined surface (22a, 32a), an inner surface on a storage section side being inclined towards a bottom wall (25, 35) side so as to gradually approach the lower wall (23, 33), or an inclined surface (20a, 30a) which is inclined to the bottom wall (25, 35) between the inner surface of the inner side wall (20, 30) and an inner surface of the bottom wall (25, 35).

Description

field of technology

[0001] The present invention relates to a handle. State of the art

[0002] From JP 2013-43 584 A a grab handle for a vehicle is known which is made of a plastic resin by injection moulding.

[0003] JP 2011-25 762 A proposes a grab handle for a vehicle which cooperates with an oil damper to dampen a movement of a handle body of the grab handle.

[0004] JP 2003-312 350 A and JP 2003-260 969 A also describe a grab handle for a vehicle with a viscous damper.

[0005] In the handle as shown in illustrated examples in JP H08-2 547 B2 and JP 3 170 454 B2, a handle main member is sometimes manufactured as a hollow injection-molded member in view of weight reduction, external appearance and the like. Fig. 11(a) to 11(c) are disclosed in JP H08-2 547 B2; reference numeral 1 denotes a forming mold comprising right and left molds 1A and 1B; reference numeral 2 denotes a grip main member (a handle); reference numeral 11 denotes a dam; and reference numeral 21 denotes a concave portion formed by the dam 11. When the grip main member 2 having a curved portion (a bent portion) 23 is manufactured by gas-assisted injection molding, injected gas flows on an inner peripheral side (an inner course) of the curved portion having a small flow resistance, so that a thin wall portion tends to be formed in that direction, which becomes a factor of reducing strength, and conversely, a thick wall portion tends to be formed on an outer peripheral side, which becomes a factor of forming a sink and the like.As a countermeasure, in JP H08-2 547 B2, the dam 11 is provided on a gas inlet side near the inner course (the inner peripheral side) of a portion in the forming mold 1 constituting the curved portion, as shown in . Fig. 11(b). As a result, a resin injected around the dam 11 is cooled relatively rapidly, so that the injected gas flows into a still-uncooled molten resin between the dam and the outer peripheral side, that is, gas can be directed to an outer peripheral side. As a result, the thin wall portion is difficult to form on the inner peripheral side, and the thick wall portion is difficult to form on an outer peripheral side.

[0006] However, in the handle main member 2, the concave portion 21 is formed as a portion corresponding to the dam 11, so that the appearance suffers, or a turbulent flow occurs due to the dam 11 within the forming mold, so that a silver streak or a wrinkle is easily formed.

[0007] Fig. 12(a) to 12(d) show processes of gas-assisted injection molding in JP 3 170 454 B2, where Fig. 12(a) shows a state where the resin is injected into a cavity 7; Fig. 12(b) shows a state where the gas is injected from a gas injection port 4; Fig. 12(c) shows a state where the resin is extruded by the injected gas and propelled within the cavity; and Fig. 12(d) shows a state where the gas is directed to the outer peripheral side by a thick wall portion 3a. In order to avoid a problem occurring in JP H08-2 547 B2, in JP 3 170 454 B2, in a method for gas injection molding of the handle main member and the like including curved portions 2 curved at both end portions of a main member portion 1 as viewed in a longitudinal direction and a fixing portion 3 intended to be connected to end portions of the curved portions, when a hollow portion 6 is formed at the end portion of the curved portion 2 continuous with the main member portion 1, a thick wall portion 3a that directs the gas to the outer peripheral side of the curved portion 2 is provided at a position intended to be connected to the end portion on the outer peripheral side of the curved portion of the fixing portion 3. Summary of the inventionProblems underlying the invention

[0008] In JP 3 170 454 B2, the injected gas is directed to the side of the thick wall portion 3a where the flow resistance is small, that is, in an outer peripheral direction of the hollow portion 6 of the curved portion, and urges the molten resin toward the fixing portion 3, so that the thick wall portion on the outer peripheral side of the curved portion 2 is not formed, and the concave portion 21, as in JP H08-2 547 B2, also does not appear. As a result, the occurrence of the depression on a surface of the outer peripheral side of the curved portion 2 can be prevented, and the appearance can be improved. However, the aforementioned documents JP H08-2 547 B2 and JP 3 170 454 B2 are still unsatisfactory from the following points of view.

[0009] First, in JP H08-2547 B2 and JP 3170454 B2, for example, even when attempting to enlarge the hollow portion in order to further reduce a consumed amount of a resin material along with weight reduction, a central portion of an approximately straight portion or a support portion and the curved portions on both sides thereof can be formed in the hollow portion with a predetermined rigidity, but it is difficult to further hollow it from the hollow portion to the thickness of the fixing portion located at an end of the curved portion. This is especially true when the fixing portion of the end of the curved portion has an aspect such as a concave stowing portion as shown in an embodiment of the present invention.Similarly, in the handle main element of JP H08-2 547 B2 and JP 3 170 454 B2, a hole made during gas injection remains as a concave shape in a central portion of an injection-molded article in which the hole is clearly visible, so that it is difficult to preserve the appearance.

[0010] In view of the above circumstances, an object of the present invention is to reduce material costs along with weight reduction by further reducing the amount of resin material consumed, while simultaneously maintaining the external appearance in a case where the grip main member is manufactured as a hollow injection-molded member using a gas-assisted injection molding method. Other objects will become apparent from the following explanations. Means to solve the problems

[0011] To achieve the above-mentioned objects, in the present invention, a grab handle comprises a hollow injection molded member in which a handle main member is manufactured by a gas-assisted injection molding method; it has an assembly of a support portion and concave stowing portions provided to be connected to both longitudinal direction ends of the support portion through curved portions therebetween; and it is fixed to a fixing surface side by fixing tools stored in the two stowing portions.Each of the storage sections is partitioned by an inner side wall and an outer side wall opposing each other in a longitudinal direction; an upper wall connecting upper sides of the two side walls on the curved section side; a lower wall connecting lower sides of the two side walls at an end side; and a bottom wall connected to the two side walls and the upper and lower walls on an outer surface side, and the upper wall has: an inclined surface where an inner surface on the storage section side is inclined toward the bottom wall side so as to gradually approach the lower wall, or an inclined surface inclined toward the bottom wall between the inner surface of the inner side wall and the inner surface of the bottom wall.

[0012] In the present invention, the "gas-assisted injection molding method" is referred to as a gas injection molding method, a SIMPRESS molding method, and the like, and is characterized by reducing the weight of an injection-molded article, preventing pitting, reducing warpage, and the like. Characteristic of the gas-assisted injection molding method is that after injecting a molten resin into a cavity of a forming mold in an uncured state, a gas (nitrogen, argon, and the like) under pressure (usually about 50 to 200 kg / cm 2) is injected to produce the hollow injection molded element by pressing the resin against a cavity surface, while a gas channel is formed inside the molten resin, which becomes a hollow section. Roughly speaking, a short-shot or incomplete filling method and a full-shot or complete filling method are commonly known for a molding process. In the incomplete filling method, the molten resin is filled in an amount less than a cavity capacity (for example, 40 to 90 percent of the cavity capacity), and filling is completed mainly by enlarging gas bubbles. In contrast, in the full filling method, the molten resin is filled in an amount equal to the cavity capacity, and part of a solidification shrinkage is compensated mainly by the generation of gas bubbles.It is preferable that the handle main member of the present invention is manufactured by the incomplete filling method rather than the complete filling method.

[0013] Likewise, in the present invention, the "mounting surface" includes an outer part and an inner part constituting a body part of a car body, an interior material such as a ceiling panel and the like mounted on the aforementioned parts, and also members similar to these. Furthermore, of the wall portions partitioning the storage portion, the "bottom wall" refers to a portion directly below the cavity of the storage portion, and more specifically, directly below the inner surface where the cavity within the storage portion is deepest. Likewise, the "inclined surface" of the present invention is not limited to a flat inclined surface and is used in a broad sense, including an inclined surface that curves slightly in an upwardly convex shape or a downwardly convex shape.

[0014] The present invention can be embodied in the above aspects.

[0015] First, in a case where the upper wall has the inclined surface in which the inner surface on the storage portion side is inclined toward the bottom wall side to gradually approach the lower wall, the inclined surface is formed to gradually narrow toward the outer side wall. According to this aspect, by improving the flow of the molten resin toward one end side of the outer side wall, a thick wall portion and a concave corresponding to the inclined surface of the upper wall can be easily formed.

[0016] Second, in a case where the upper wall has the inclined surface in which the inner surface on the storage section side is inclined toward the bottom wall side so as to gradually approach the bottom wall, the inclined surface is included that is located between the inner surface of the inner side wall and the inner surface of the upper wall, and that is inclined from the upper side to the bottom wall in a direction away from the inner surface of the inner side wall. According to this aspect, a reduction in a consumed amount of resin is performed in proportion to a size of the cavity accompanied by weight reduction, so that the inner side wall can be formed having a thin rigid wall.

[0017] Third, in a case where the inclined surface inclined toward the bottom wall is included between the inner surface of the inner side wall and the inner surface of the bottom wall, the inclined surface is formed in such a manner that it gradually narrows toward the bottom wall. According to this aspect, the molten resin smoothly flows further toward one end side of the inner side wall, so that the thick wall portion and the concavity corresponding to the inclined surface between the inner surface of the inner side wall and the inner surface of the bottom wall can be formed more reliably. Effect of the invention

[0018] In the present invention, the holding tool is hardly visible in a use state and a non-use state, so that the external appearance is very good.

[0019] In the present invention, between the wall portions partitioning the storage portion, in the case where the upper wall has the inclined surface whose inner surface on the storage portion side is inclined toward the bottom wall side so as to gradually approach the lower wall, the molten resin is forcibly directed to a portion of the inclined surface, so that the thick wall portion is smoothly formed, and the cavity can be smoothly formed from the hollow portion of the support portion and the curved portion in the thick wall portion, allowing gas to pass through its interior. As a result, the reduction in the amount of resin consumed is performed in proportion to a size of the cavity, accompanied by weight reduction, so that the outer side wall having the thin rigid wall can be formed.

[0020] In the present invention, between the wall portions partitioning the storage portion, in the case where the inclined surface inclined toward the bottom wall is included between the inner surface of the inner side wall and the inner surface of the bottom wall, the molten resin is forcibly directed to the inclined surface portion, so that the thick wall portion is smoothly formed, and the cavity can be smoothly formed from the hollow portion of the support portion and the curved portion in the thick wall portion, allowing gas to pass through its interior. As a result, the amount of resin consumed is reduced in proportion to the size of the cavity, accompanied by weight reduction, so that the inner side wall having the thin, rigid wall can be formed. Short description of the drawings Fig. 1 is an external view showing a handle according to an embodiment of the invention in a use state. Fig. 2(a) and Fig. 2(b) show details of the handle in Fig. 1, where Fig. 2(a) is a rear view of the grab handle in a stowed position; and Fig. 2(b) is a cross-sectional view taken along a line CC in Fig. 2(a). Fig. 3(a) is a cross-sectional view taken along a line AA in Fig. 2(a); and Fig. 3(b) is a cross-sectional view taken along a line BB in Fig. 2(a). Fig. 4(a) to 4(c) show details of a main handle element in Fig. 1, where Fig. 4(a) is a rear view; Fig. 4(b) is a view from below; and Fig. 4(c) is a front view. Fig. 5(a) is a schematic perspective view of the handle main element; and Fig. 5(b) is a cross-sectional view taken along a line FF in Fig. 5(a). Fig. 6(a) is an enlarged cross-sectional view taken along a line A1-A1 in Fig. 4(a); and Fig. 6(b) is an enlarged cross-sectional view taken along a line A2-A2 in Fig. 4(a). Fig. 7(a) is an enlarged cross-sectional view taken along a line B1-B1 in Fig. 4(a); and Fig. 7(b) is an enlarged cross-sectional view taken along a line B2-B2 in Fig. 4(a). Fig. Figure 8 is an enlarged cross-sectional view taken along a line EE in Fig. 4(b). Fig. 9 is a drawing showing another example of Fig. 8 shows that Fig. 8 corresponds. Fig. 10(a) and Fig. 10(b) are schematic structural views for explaining the molding of essential parts of the handle main member. Fig. 11(a) to 11(c) are explanatory views which Fig. 1, Fig. 2 and Fig. 5 of JP H08-2 547 B2. Fig. 12(a) to 12(d) are explanatory views which Fig. 3 of JP 3 170 454 B2. Best mode for carrying out the invention

[0021] An embodiment of the present invention will be described below with reference to the drawings. After explaining the overall structure of a handle, the explanation will describe essential parts and features of the apparatus of a gas-assisted injection molding process.

[0022] (Overall structure) As in Fig. 1 to Fig. As shown in Fig. 3(b), the grab handle of the embodiment includes: a handle main member 1 comprising a unit of a support portion 10 and concave stowing portions 2 and 3 provided to be connected to both ends of the support portion 10 via curved portions 14; and support tools 4 and 5 rotatably supported in the respective stowing portions 2 and 3, and the grab handle is fixed by the support tools 4 and 5 with respect to a fixing surface 6 on a car body side. In addition, the stowing portions 2 and 3 have different shape details and are asymmetrical. The support tools 4 and 5 are similar in that they include support members 40 and 50, clamps 42 and 52 attached to the support members 40 and 50, and covers 44 and 54.A coil spring 46, which biases the holding tool 4 or the handle main element 1 to rotate relative to the other of the holding tool 4 and the handle main element 1, is arranged between the storage section 2 and the holding tool 4. A damper 56, which reduces a rotational speed of the handle main element 1, is arranged between the storage section 3 and the holding tool 5.

[0023] As in Fig. 4(a) to Fig. As shown in Figure 8, the handle main element 1 comprises a hollow injection-molded element produced by the gas-assisted injection molding process. The support portion 10 has an approximately rectangular frame shape in cross-section (see Fig. 5(b)), and an inner portion thereof has a relatively large hollow portion 15 on both sides up to the curved portions 14 (see Fig. 8). The stowage sections 2 and 3 have a concave shape with one rear surface side open. Cavities 26 and 36 within the concave shape are partitioned by an inner side wall 20 or 30 and an outer side wall 21 or 31, which are opposite to each other in a longitudinal direction; an upper wall 22 or 32, by which an upper surface of the inner and outer walls is connected to one side of a curved section 14; a lower wall 23 or 33, which connects both lower sections of the inner and outer walls; and a bottom wall 25 or 35 on an outer surface side, which is connected to the inner and outer side walls 20 and 21 or 30 and 31; and the upper and lower walls 22 and 23 or 32 and 33. The reference numerals 24 and 34 in Fig. 8 represent partition walls that separate the cavity 26 or 36 and the hollow section 15 in the upper walls 22 and 32.

[0024] On surfaces of the inner and outer walls that are opposite to each other, bearing grooves 27 and 37 are provided that are opposite to each other. As shown in Fig. 6(a) and Fig. As shown in Fig. 6(b), the bearing grooves 27 and 37 are approximately inverted L-shaped and include insertion grooves extending from an opening edge to a bottom wall side, and bearing holes 27a and 37a provided at curved portions adjacent to the insertion grooves. Reference numerals 28 and 38 represent elastic locking pieces that partition a portion of the bearing holes 27a and 37a. Likewise, in the bottom wall 23 of the storage section 2, as shown in Fig. 4(b), a spring lock step 23a is provided at a portion on an inner surface side. A step portion 33a is provided in the lower wall 33 and the bottom wall 35 of the storage portion 3, which abuts against a corresponding portion of the damper 56, that is, a convex portion 56c provided in the outer cylinder 56a described later at a portion on the inner surface side.

[0025] The support members 40 and 50 include: base portions 40a and 50a; shaft portions 40b and 50b projecting on both sides of each base portion; approximately tongue-shaped leg portions 40c and 50c projecting on a lower side of each base portion; and projections 40d and 50d provided at projecting ends of the leg portions 40c and 50c. Then, in the support members 40 and 50, the clamps 42 and 52 are installed so as to be sandwiched between the leg portions 40c and 50c, and the covers 44 and 54 are installed to cover respective inner sides.

[0026] The clamps 42 and 52 are approximately U-shaped and made of metal, and include two plate portions 42b and 52b that oppose each other; and intermediate portions 42a and 52a that have engaging holes to connect the two plate portions. In the two plate portions 42b and 52b, respectively, there are provided elastic claws 42c and 52c divided by approximately C-shaped slots; and locking holes (not shown in the drawings) that open to face an upper surface thereof.

[0027] The covers 44 and 54 comprise: main elements 44a and 54a covering the support sections 40a and 50a; and as shown in Fig. 2(a) and Fig. 3(a) and Fig. 3(b), fastening piece portions 44b and 54b and pawl portions 44c and 54c projecting on the inner surface side. Then, in the covers 44 and 54, the pawl portions 44c and 54c come into press contact with holes on clamp plate portion sides (not shown in the drawings) with respect to the base portions 40a and 50a, and in the fastening piece portions 44b and 54b, concave portions at a front end thereof engage with corresponding shaft portions 40b and 50b to be fixed thereto. In an assembled state, the clamps 42 and 52 are held by the pawl portions 44c and 54c, which are inserted into holes of the base portions so as to pass through in an inclined state.

[0028] The holding tools 4 and 5 assembled in the above-mentioned manner occupy the cavities 26 and 36 of the corresponding storage sections 2 and 3 of the handle main element 1 and are rotatably fitted into the bearing holes 27a and 37a corresponding to the shaft sections 40b and 50b on both sides by the bearing grooves 27 and 37 and by the elastic locking pieces 28 and 38, and are supported with respect thereto. As shown in Fig. 2(a) and Fig. 2(b), after the coil spring 46 is held around the corresponding shaft, one abutment portion 46b is locked in a rib (not shown in the drawings) provided in the support member 40, and the other abutment portion 46a is locked against a biasing force in the above-mentioned step 23a. Then, the handle main member 1 rotates by the biasing force of the coil spring 46, so that it is in a non-use state (a storage position shown in Fig. 3(a) by solid lines) by being arranged along a part 60.

[0029] The damper 56 includes the outer cylinder 56a and an inner cylinder 56b, which, in a state where a fluid is held, is rotatably fitted with respect to a circular space of the outer cylinder 56a. The outer cylinder 56a has two convex portions 56c (see Fig. 3(b)) provided on an outer circumference and engaging with the step portion 33a so that it rotates integrally with the handle main member 2. The inner cylinder 56b has a convex portion (not shown in the drawings) at a closed end. Then, the damper 56 is installed with respect to the storage portion 3 in a state where an opening at one end of the outer cylinder 56a is rotationally engaged with a convex portion of the support member 50, and the closed-end portion of the inner cylinder 50b is engaged and fitted with a concave shape of the support member 50.

[0030] As in Fig. 3(a) and Fig. 3(b), the above-mentioned grab handle is mounted relative to the body by engaging the clamps 42 and 52 of each of the holding tools with two mounting holes 6a provided in a body panel 6. In this case, the body panel 6 is covered by a roof trim (not shown in the drawings), and the holding tools 4 and 5 are arranged on its roof trim. Then, the handle main member 1 is operated to rotate from the storage position shown by the solid line to a use position shown by the dashed lines against the biasing force of the coil spring 46, and when released in the use position, the handle main member 1 rotates back to the storage position by the biasing force of the coil spring 46.At this time, the grip main member 1 rotates while maintaining a state in which a convex portion 56c on the outer cylinder abuts against a corresponding end surface of the step portion 33a. As a result, the outer cylinder 56a of the damper is decelerated together with the grip main member 1 while experiencing fluid resistance relative to the inner cylinder 56b, so that it rotates slowly.

[0031] (Essential parts and auxiliary molding process) The above-mentioned handle main element 1 is manufactured by the assisted molding process. In injection molding processes, a forming mold 7, which is Fig. 10(a) and Fig. 10(b) is used, and after an appropriate amount of molten resin is injected into a cavity of the forming die 7 from an injection port 9a which is an outlet of a resin injection device 9 (although polypropylene, which is a thermoplastic resin, is used in this example, other resins may be used as shown in JP H08-2547 B2 and JP 3170454 B2), gas such as nitrogen and the like, which has been compressed to a predetermined pressure, is injected in an uncured state through a nozzle 8a of a fluid injection device 8, and while a gas channel is formed inside the molten resin, which becomes a hollow portion, the resin is pressed against one side of the cavity surface from the inside. The above injection molding processes are the same as the injection molding process shown in JP H08-2 547 B2 and JP 3 170 454 B2.

[0032] The features of the device mainly consist of the following: (A) a structure in which a tip of the nozzle 8a of the fluid injection device is arranged in a portion where the partition wall 24 is to be formed; (B) a structure in which the injection port 9a, which is the outlet, is arranged in a portion where the bottom wall 23 is to be formed; and further (C) a structure in which, by designing a shape of an outer surface of the storage portion 3 and the like as described below, the hollow portion 15 having a large size is formed from the support portion 10 formed as shown in Fig. 8, toward the curved portions 14, and cavities 18 and 19 extending from an upper wall 32 side to a lower wall 33 side can be easily formed during injection molding by gas injection in a state where the cavities 18 and 19 branch from the hollow portion 15 in thicknesses of the inner side wall 30 and the outer side wall 31. Characteristic features of the above-mentioned structures will be explained below.

[0033] As for (A), the tip of the nozzle 8a of the fluid injection device is arranged in the corresponding section to form the partition wall 24 from a mold part 7a corresponding to the cavity 26 of the stowing section, so that a hole 29 (see Fig. 6(a)) during injection, which is formed after injection molding, is exposed at a portion that is very difficult to see in the cavity 26 of the storage portion 2. As a result, in this structure, the hole 29 is not visible in either the use position or the non-use position of the handle, thereby improving the distinctive appearance characteristic compared to JP H08-2 547 B2 and JP 3 170 454 B2.

[0034] As for (B), compared to the structure where the molten resin is injected from a central portion of the cavity as shown in JP H08-2547 B2 and JP 3170454 B2, the injection port 9a of the molten resin is arranged in the portion intended for forming the bottom wall 23 of the storage portion 2, so that the external appearance is excellent. In addition, the injection of the molten resin from the injection port 9a, which is the outlet, is completed during injection molding, as shown in Fig. 10(b) is schematically shown, and a push pin 9b, which is pushed during gas injection by an oil-hydraulic cylinder and the like (not shown in the drawings), is operated to control injected gas in such a manner that the injected gas is directed in the direction of the arrow of Fig. 10(b) is ejected so that a part of the resin immediately before the injection port flows back to a liner side by a gas pressure, and the cavity 17 and / or the cavity 16 on the side of the above-mentioned stowing portion 2 are / will be further enlarged, so that they are also effective for further weight reduction.

[0035] Regarding (C), when the handle main member 1 is formed by gas-assisted injection molding, the cavities 18 and 19 are formed as large as possible in the inner and outer side walls 30 and 31 within a range where the rigidity of the storage portion 3 is not impaired, in order to significantly reduce an amount of resin material consumed along with weight reduction. The inventor conducted repeated studies to form the cavities 18 and 19 extending from the upper wall 32 side to the lower wall 33 side in the state where the cavities 18 and 19 branch into the thicknesses of the inner side wall 30 and the outer side wall 31 following the hollow portion 15. As a result, the inventor arrived at the following schematically shown in Fig. 8 and Fig. 9, provides conclusive evidence for the following essential conditions. In cross-sectional views of Fig. 8 and Fig. 9, representative examples of the main handle elements that were tested for the shapes of the cavities 18 and 19 are shown in the drawings. Even if a cavity 18a in Fig. 9 is slightly wider than the cavity 18 in Fig. 8, there is a cavity 19a in Fig. 9, in terms of length, is slightly shorter than the cavity 19 in Fig. 8. This shows that the shapes of cavities 18 and 19 or cavities 18a and 19a change slightly depending on the injection conditions.

[0036] First, it is important that, among the wall portions partitioning the cavity 36 (26) of the storage portion, on an inner surface of the upper wall 32 (22) on a storage portion side, at least one portion has an inclined surface 32a (22a) inclined toward a bottom wall 35 (25) side so as to gradually approach the lower wall 33 (23).This structure was obtained from the experiments conducted by changing the molds, and when the inner surface of the upper wall on the stowing portion side has the inclined surface 32a (22a) inclined toward the bottom wall side so as to gradually approach the lower wall, the molten resin is forcibly directed to the portion on its inclined surface, so that a thick wall portion which is relatively thick can be manufactured without difficulty, and the cavity 18 and / or the cavity 19 can be formed without difficulty subsequent to the hollow portion 15 of the support portion 10 and the curved portion 14 in the thick wall portion so that the gas breaks through the thick wall portion thereof.As a result, as the grip main member 1, a reduction in a consumed amount of resin is performed in proportion to a size of the cavity 18 and / or the cavity 19 along with the weight reduction, so that the outer side wall having a thin rigid wall can be formed.

[0037] It is also important that of the wall sections that partition the cavity 36 (26) of the storage section, at least one section has an inclined surface 30a (20a) that is inclined towards the bottom wall between an inner surface of the inner side wall 30 (20) and an inner surface of the bottom wall 35 (25), that is, the inclined surface 30a (20a) that is arranged between the inner surface of the inner side wall 30 (20) and the inner surface of the upper side wall 32 (22) and is inclined in a direction in which it gradually moves away from the inner surface of the inner side wall from the upper side and approaches the bottom wall 35 (25) on the lower side.This structure was also found from the experiments carried out by changing the molds, and when the inclined surface 30a (20a) inclined to the bottom wall between the inner surface of the inner side wall and the inner surface of the bottom wall is provided, the molten resin is forcibly directed to the portion on its inclined surface, so that the thick wall portion which is relatively thick can be formed without difficulty and the cavity 18 and / or the cavity 19 can be formed in the thick wall portion continuously from the hollow portion 15 of the support portion 10 and from the curved portion 14 in the thick wall portion so that the gas breaks through the thick wall portion thereof.As a result, as the grip main member 1, in proportion to a size of the cavity 18 and / or the cavity 19, the reduction of the consumed amount of resin is performed along with the weight reduction, so that the outer side wall having the thin rigid wall can be formed.

[0038] In addition, it has been proven through experiments that the following structures are also important. First, with regard to the inclined surface 32a (22a) of the above-mentioned upper wall 32 (22), as shown in Fig. 8, the inclined surface 32a (22a) gradually narrows to a certain extent as it approaches the outer side wall 32 (21). With this structure, it is conceivable that by arranging the mold in such a manner as to improve a flow of the molten resin to one end side of an outer side wall as much as possible, the thick wall portion and the cavity 18 and / or the cavity 19 corresponding to the inclined surface 32a (22a) of the upper wall can be formed more easily. Similarly, the above-mentioned inclined surface 30a (20a) gradually narrows to a certain extent as it approaches the lower wall 33 (23).In this structure, it is conceivable that by setting the mold in such a manner that a flow of the molten resin to a side of an end of the outer side wall is improved as much as possible, the thick wall portion and the cavity 18 and / or the cavity 19 corresponding to the inclined surface 30a (20a) between the inner surface of the inner side wall and the inner surface of the bottom wall can be formed more easily.

[0039] Furthermore, the above-mentioned handle main element 1 has the above-mentioned structures and is configured as follows. Regarding the thickness of the bottom wall 35, the thickness of the bottom wall 35 is determined as shown in Fig. 7(a), is formed so as to become gradually thinner as it approaches a thickness t1 on the side of the lower wall 33 from a thickness t on the side of the upper wall 32. In this regard, the bottom wall 35 is set to a thickness at which the cavity can be formed with difficulty by the gas injection into the thickness, so that for this thickness in the inner and outer side walls 30 and 31, the cavity can be formed without difficulty by the gas injection into the thickness. Similarly, in the inner and outer side walls 30 and 31, as shown in Fig. 8, at least the thickness t2 of an upper side portion is arranged to be equal to or thicker than the thickness t of a portion of the bottom wall 35 on the side of the upper wall, ie in Fig. 7 (a) and Fig.8 is set to t2 > t. The above-mentioned findings are also obtained from the results of the experiments, and it is conceivable that the injected gas only enters and advances into the thickness of the inner and outer side walls 30 and 31, so that one has the structures effective to form the relatively large cavity 18 and / or cavity 19 within a range where the rigidity is not impaired.

[0040] Details of the grab bar of the present invention can be modified or developed in various ways with reference to the embodiments and the like, provided that the grab bar of the present invention has the structures specified in the invention. Regarding the holding tool, it is not limited to the holding tool used in the embodiments, and, for example, the holding tool can be changed to structures disclosed in JP 2003-200770 A, JP 2011-25762 A, JP 2013-169961 A, and the like. Furthermore, a structure in which a locking hook is additionally provided using a holding tool disclosed in JP 2015-174516 A and the like can be adopted. Explanation of reference symbols 1 a main handle element 2 a storage section 3 a stowage section 4 a holding tool (40 is a holding element a clamp.) 5 a holding tool (50 is a holding element and 52 is a clamp.) 6 one part (one mounting surface) 7 a forming mold 8 a fluid injection device 9 a resin injection device 10 a support section (11 are side walls, 12 is an upper wall and 13 is a lower wall.) 14 curved sections 15 a hollow section of a support section 20 an inner side wall (20a is an inclined surface.) 21 an outer side wall 22 is an upper wall (22a is an inclined surface and 29 is a hole during an injection.) 23 a lower wall (23a is a step section.) 24 a partition wall between the hollow section and a cavity section. 25 a floor wall (25a is an inclined surface.) 26 a cavity 27 a bearing groove (27a is a bearing hole.) 30 an inner side wall (30a is an inclined surface.) 31 an outer side wall 32 an upper wall (32a is a sloping surface.) 33 a lower wall (33a is a step.) 34 a partition wall between the hollow section and the cavity section 35 a floor wall (35a is an inclined surface.) 36 a cavity 37 a bearing groove (37a is a bearing hole.)

Claims

[1] A grab handle comprising: a hollow injection-molded member in which a handle main element (1) is manufactured by a gas-assisted injection molding process; comprising a unit of a support portion (10) and concave stowing portions (2, 3) provided to be connected to both longitudinal ends of the support portion (10) through intervening curved portions (14); and fixed to a fixing surface side (6) by fixing tools (4, 5) stored in the two stowing portions (2, 3), wherein each of the storage sections (2, 3) is divided by: an inner side wall (20, 30) and an outer side wall (21, 31) which are opposite to each other in a longitudinal direction; an upper wall (22, 32) which connects upper sides of the two side walls (20, 21, 30, 31) on one side of a curved section (14); a lower wall (23, 33) which connects lower sides of the two side walls (20, 21, 30, 31) on an end side; and a bottom wall (25, 35) which connects the inner and outer side walls (20, 21, 30, 31) and the upper and lower walls (22, 23, 32, 33) on an outer surface side, and the upper wall (22, 32) has: an inclined surface (22a, 32a), an inner surface on a storage section side being inclined towards a bottom wall (25, 35) side so as to gradually approach the lower wall (23, 33), or an inclined surface (20a, 30a) which is inclined to the bottom wall (25, 35) between the inner surface of the inner side wall (20, 30) and an inner surface of the bottom wall (25, 35). [2] The grab handle according to claim 1, wherein in a case where the upper wall (22, 32) has the inclined surface (22a, 32a) in which the inner surface on the storage section side is inclined toward a bottom wall (25, 35) side so as to gradually approach the lower wall (23, 33), the inclined surface (20a, 30a) is formed to gradually become narrower toward the outer side wall (21, 31). [3] The grab handle according to claim 1 or 2, wherein in a case where the upper wall (22, 32) has the inclined surface in which the inner surface on the storage section side is inclined toward a bottom wall (25, 35) side so as to gradually approach the lower wall (23, 33), the upper wall (22, 32) has the inclined surface (20a, 30a) inclined toward the bottom wall (25, 35) between the inner surface of the inner side wall (20, 30) and the inner surface of the bottom wall (25, 35). [4] A handle according to claim 1, wherein in a case where the upper wall (22, 32) has the inclined surface inclined toward the bottom wall (25, 35) between the inner surface of the inner side wall (20, 30) and the inner surface of the bottom wall (25, 35), the inclined surface (20a, 30a) is formed in such a manner as to gradually become narrower toward the lower wall (23, 33).

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