JP6416577B2 - Resin sliding bearing and beauty device - Google Patents

Description

  The present invention relates to a sliding bearing, and more particularly to a resin sliding bearing manufactured by injection molding. The present invention also relates to a cosmetic device using this sliding bearing.

  Synthetic resin sliding bearings are widely used as bearings that rotatably support a rotating body on a support shaft. Synthetic resin sliding bearings are often used in rotating parts with light loads and low rotational speeds because they are lighter in weight, simple in structure, less in number of parts, and less expensive than rolling bearings. For example, in the cosmetic device described in Patent Document 1, a synthetic resin sliding bearing is used, and a substantially spherical rotating body is rotatably held on a support shaft. The bearing member used in the cosmetic device described in Patent Document 1 has a pair of elastically deformable locking claws projecting on the outer periphery, and the locking member holds the rotating body from the bearing member by the locking claws. .

  Conventionally, such resin-made sliding bearings are manufactured by injection molding of synthetic resin, and the gate that is the entrance of the resin at the time of injection molding is arranged on the outer peripheral surface avoiding the inner diameter surface that is the bearing surface. It was. The outer peripheral surface of such a sliding bearing may be covered with a rotating body, and even if the traces of the gate remain, the appearance will not be impaired. Therefore, considering the fluidity of the resin, the axial direction of the sliding bearing Side gates were arranged around the end face. The gate cut is performed by a gate cut machine attached to the take-out machine when the molded body is taken out from the molding machine in the manufacturing process of injection molding, or manually by using a nipper or the like after the injection molding.

JP 2013-103085 A

  However, in the bearing member described in Patent Document 1, the mechanical strength of the connecting portion of the elastically deformable locking claw with the bearing body is insufficient, and the elastically deforming portion is damaged when the rotating body is incorporated or removed. There is a risk. Such damage does not occur during normal installation, but may occur when incorrect installation is performed or when the rotating body is forcibly removed.

  The present invention has been made in order to cope with such a problem, and in the case of improper assembly of a rotating body in a resin sliding bearing made of an injection molded body having a locking claw for fixing the rotating body. Even if you try to forcibly remove the rotating body, you can prevent the elastic deformation part that supports the locking claw from being damaged, and if necessary, omit the independent gate cutting process during injection molding An object of the present invention is to provide a resin sliding bearing that can be manufactured and a cosmetic device using the same.

  The resin sliding bearing of the present invention is a resin sliding bearing that rotatably supports a rotating body on a support shaft, and the resin sliding bearing is an injection molded body formed by injection molding a synthetic resin, and the support shaft is A substantially cylindrical bearing body that can be inserted, a locking claw for fixing the rotating body to the sliding bearing, the locking claw disposed on the outer peripheral side, and the locking claw being a cylinder of the bearing body And an elastic piece that can be elastically pushed inward. The elastic piece has a gate mark formed by the injection molding and is formed integrally with the bearing body.

  The locking claw is provided at an end of the elastic piece opposite to the length direction of the elastic piece with respect to a boundary portion of the elastic piece with the bearing body, and the gate mark is centered in the length direction of the elastic piece. It is located between a part and the outermost part of the said latching claw, It is characterized by the above-mentioned.

  The gate mark is located on the inner peripheral side of the elastic piece. In this case, the gate trace is a gate trace by a tunnel gate.

  A plurality of the locking claws and the elastic pieces are formed at equal intervals on the circumference of the bearing body.

  The inner peripheral surface of the elastic piece is in a non-contact state with the support shaft.

  The rotating body is a sphere or a roller.

  The cosmetic device of the present invention is a cosmetic device provided with a sphere or a roller at the distal end portion of the handle, and the sphere or the roller which is a rotating body is rotatable on a support shaft at the distal end portion of the handle via a bearing. The bearing is the resin sliding bearing of the present invention.

  The resin sliding bearing of the present invention is an injection molded body formed by injection molding a synthetic resin, and has a substantially cylindrical bearing body in which a support shaft can be inserted, and a latch for fixing the rotating body to the sliding bearing. A claw and an elastic piece which is arranged on the outer peripheral side and which can be elastically pushed into the cylinder body of the bearing body, and the elastic piece has a gate mark by injection molding. Since it is formed integrally with the bearing body, the molten resin at the time of injection molding flows from the elastic piece to the bearing body, and in particular, the flow at the boundary between the bearing body and the elastic piece becomes smooth, and the boundary is mechanical Strength is improved. For this reason, even when the rotating body is mistakenly installed or when the rotating body is forcibly removed, the elastic piece supporting the locking claw is damaged from the base (boundary portion). Can be prevented.

  The locking claw is provided at an end of the elastic piece opposite to the length direction with respect to the boundary portion of the elastic piece with the bearing body, and the gate mark is locked from the center in the length direction of the elastic piece. Since it is located between the ends of the claws, the flow of the molten resin becomes smoother and the mechanical strength between the bearing body and the elastic piece (boundary portion) is further improved.

  Since the gate trace is located on the inner peripheral side of the elastic piece, the gate trace can be hidden from the surface of the resin sliding bearing, which is excellent in appearance. Further, in this case, since the gate mark is a gate mark by a tunnel gate, the gate can be cut when the molded product protrudes in the injection molding process.

  Since the plurality of locking claws and elastic pieces are formed at equal intervals on the circumference of the bearing body, the fixing force of the rotating body is improved and stabilized.

  Since the inner peripheral surface of the elastic piece is not in contact with the support shaft, no extra sliding resistance is added during use.

  Since the resin sliding bearing of the present invention has the effects as described above, it can be suitably used as a bearing for a cosmetic device in which the rotating body is a sphere or a roller.

  The cosmetic device of the present invention includes a sphere or roller at the tip of the handle, and the sphere or roller as a rotating body is rotatably supported on the support shaft at the tip of the handle via the resin sliding bearing of the present invention. Therefore, it is possible to prevent damage to the fixed portion (elastic piece) due to assembly or removal of the rotating body.

It is a perspective view which shows an example of the resin sliding bearing of this invention. It is the front view and sectional drawing of a resin slide bearing shown in FIG. It is the schematic which shows the rotary body support part of the cosmetics device of this invention.

  In the case of a sliding bearing having the same shape as the present invention, when a gate is provided on the bearing body as in the prior art, the molten resin fills the locking claw through the elastic piece and further flows back into the gap in the cavity of the bearing body. The flow of the resin is mixed between the elastic piece and the elastic piece (boundary portion), and a random flow is generated in this portion. As a result, it was found that the mechanical strength of the boundary portion was lowered.

  Based on such knowledge, the resin sliding bearing according to the present invention is capable of elastically pushing the locking claw into the cylindrical inner side of the bearing main body, the locking claw for fixing the rotating body, and the locking claw. The elastic piece is integrally formed as a part of the bearing body, and the elastic piece has a gate mark by injection molding. That is, the gate at the time of injection molding is provided at the portion of the elastic piece. Thereby, the molten resin at the time of injection molding flows from the elastic piece to the bearing body. Since the volume of the bearing body is larger than the volume of the elastic piece, the molten resin does not flow back into the elastic piece even if the volume of the bearing body is filled with the molten resin. Therefore, the flow of the molten resin between the bearing body and the elastic piece (boundary part) becomes smooth, the mechanical strength at the boundary part is improved, and the elastic piece is prevented from being damaged from the root (boundary part). it can.

  The resin sliding bearing of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an example of the resin sliding bearing of the present invention, and FIG. 2 is a front view (upper view) and a sectional view (lower view) of the resin sliding bearing. As shown in FIG. 1, the resin sliding bearing 1 of the present invention includes a substantially cylindrical bearing body 2 into which a support shaft provided in a cosmetic device or the like can be inserted, and a rotating body such as a roller of the cosmetic device. The latching claw 3 for fixing to the outer side, and the elastic piece 4 which can arrange | position the latching claw 3 to the outer peripheral side and can be elastically pushed into the cylinder inner side direction of the bearing main body 2 are provided. The resin sliding bearing 1 is an injection molded body of synthetic resin, and each part of the bearing main body 2, the locking claw 3, and the elastic piece 4 is integrally formed by injection molding. In the present invention, an injection molded body in which at least the elastic piece 4 and the bearing body 2 are integrally molded may be used. The locking claw 3 may be integrally molded including this as in the present embodiment. It may be formed as a body and bonded to the elastic piece 4.

  The bearing body 2 has a substantially cylindrical shape, and has a flange 2a at one end and a through hole 2b through which the support shaft passes at the other end. In the bearing body 2, the shape other than the elastic piece 4 and the locking claw 3 can be appropriately changed according to the shape of the support shaft and the rotating body that are the counterpart material.

  As shown in FIG. 2, the elastic piece 4 has a gate mark 5 formed by injection molding. The bearing body 2 does not have a gate mark. Thereby, as described above, the molten resin at the time of injection molding flows from the elastic piece 4 to the bearing body 2, and therefore, when the gate is provided on the bearing body 2 side and injection molding is performed (when the bearing body 2 has a gate mark). As compared with the above, the flow becomes smooth, and the mechanical strength of the boundary portion 6 between the bearing body 2 and the elastic piece 4 can be improved.

  In the form shown in FIG. 1 and FIG. 2, the shape of the elastic piece 4 is such that one part of the cylindrical outer wall of the bearing body 2 is a boundary 6 with the bearing body 2 around the portion that becomes the elastic piece 4. It is made into the shape cut out into the slit shape leaving only. The elastic piece 4 is a long piece along the cylindrical axis direction of the bearing body 2. The locking claw 3 is provided on the outer peripheral side of the elastic piece 4 at the end opposite to the boundary portion 6 in the length direction. The shape of the elastic piece 4 is not limited to that shown in these drawings, and may be any shape that can elastically push the locking claw 3 disposed on the outer periphery toward the inside of the cylinder of the bearing body 2. The length of the elastic piece 4 in the longitudinal direction, the position of the boundary portion 6 and the like can be set as appropriate.

  The number of the fixing parts composed of the elastic pieces 4 and the locking claws 3 may be at least one, and preferably 2 to 4. By providing two to four, it is possible to improve the fixing force with the rotating body while maintaining the required mechanical strength of the bearing body. Moreover, when providing two or more, it is preferable to provide at equal intervals on the periphery of a bearing main body. By providing at equal intervals, the fixing force with the rotating body is stabilized. In the case of providing a plurality, it is preferable to provide gates on all the elastic pieces in consideration of the flow state of the molten resin at the time of injection molding.

  At the time of use after the bearing is assembled, the inner peripheral surface of the elastic piece 4 is preferably in a non-contact state with respect to the support shaft. In the form of FIG. 2, the inner peripheral surface 3b of the elastic piece 4 is on the outer diameter side with respect to the inner peripheral surface 2c of the bearing body 2 in contact with the support shaft, and does not contact the support shaft. The support shaft is supported by the inner peripheral surface 2 c of the bearing body 2 and is not supported by the inner peripheral surface 3 b of the elastic piece 4. For this reason, unstable sliding resistance is not added.

  In the form shown in FIGS. 1 and 2, the gate mark 5 is located on the inner peripheral side of the elastic piece 4. That is, the gate is provided at a portion that becomes the inner peripheral surface of the elastic piece 4 at the time of injection molding. Since the gate mark 5 is located on the inner peripheral side of the elastic piece 4, the gate mark 5 can be hidden from the outer surface of the sliding bearing, and the appearance is excellent. Further, by providing a gate at a portion that becomes the inner peripheral surface of the elastic piece 4 at the time of injection molding and using the gate as a tunnel gate, the gate can be cut when the molded product protrudes in the injection molding process. Thereby, the independent gate cut process by the manual work after injection molding etc. can be omitted.

  Further, the position of the gate mark 5 in the cylindrical axis direction is not particularly limited. However, as shown in FIG. 2, the gate mark 5 is positioned between the central portion C in the length direction of the elastic piece 4 and the end 3 a of the locking claw 3. It is preferable to do. In FIG. 2, if the length of the elastic piece 4 in the longitudinal direction (axial direction) is L, the length from the center C to the outermost end 3a of the locking claw 3 is L / 2. By providing the gate at the time of injection molding on the outermost end portion 3a side of the locking claw 3 in the elastic piece 4, the flow of the molten resin at the boundary portion 6 becomes smoother than when provided on the boundary portion 6 side, The mechanical strength of the boundary portion 6 can be further improved.

  The synthetic resin used for the resin sliding bearing of the present invention is not particularly limited as long as it can be injection-molded and has sliding characteristics as a sliding bearing material. For example, polyacetal (POM) resin, polyphenylene sulfide (PPS) resin, polyamide (PA) resin, polyamideimide (PAI) resin, polytetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) resin, tetrafluoroethylene / hexa Fluoropropylene copolymer (FEP) resin, injection-moldable fluororesin such as ethylene-tetrafluoroethylene copolymer (ETFE) resin, polyetheretherketone (PEEK) resin, injection-moldable polyimide (PI) resin, etc. Is mentioned. Each of these synthetic resins may be used alone or may be a polymer alloy in which two or more kinds are mixed.

  These synthetic resins may be blended with a solid lubricant such as polytetrafluoroethylene (PTFE) resin or oil-impregnated resin blended with lubricating oil in order to improve sliding properties. Moreover, you may provide electroconductivity by mix | blending electrically conductive agents, such as carbon black. Furthermore, an inorganic filler such as iron oxide or carbon black may be blended to increase the hardness.

  In the manufacturing method for obtaining the resin sliding bearing of the present invention, a synthetic resin melted from a gate such as a tunnel gate provided in a portion serving as an elastic piece is injected into a mold having a cavity of the shape of the resin sliding bearing having the above configuration. A step of filling, a step of cooling and solidifying the injection-filled synthetic resin, a step of opening the mold, and a step of releasing the molded body from the mold with a protruding pin. In particular, as described above, the gate position in the injection filling process is characteristic.

  An example in which the resin sliding bearing of the present invention is applied to a cosmetic device will be described with reference to FIG. FIG. 3 is an example of a cosmetic device according to the present invention, and is a schematic view showing a rotating body supporting portion thereof. As shown in FIG. 3, the cosmetic device 11 includes a sphere 13 that is a rotating body at the distal end portion of the handle 12. The spherical body 13 is rotatably supported on the support shaft 14 at the distal end portion of the handle 12 via the resin sliding bearing 1 of the present invention. By pushing the resin sliding bearing 1 into the inside of the sphere 13, the locking claw 3 is engaged with a groove inside the sphere 13 through elastic deformation of the elastic piece 4 toward the inside of the cylinder. Thereby, the spherical body 13 and the resin sliding bearing 1 are fixed. Further, the support shaft 14 is inserted into the inner periphery of the bearing body 2 and is prevented from coming off by a retaining ring or the like at the end of the through hole 2b. As a result, the support shaft 14 is supported by the resin sliding bearing 1. With these configurations, the resin sliding bearing 1 supports the sphere 13 fixed to the bearing so as to be rotatable with respect to the support shaft 14.

  The shape of the rotating body is not particularly limited, and a cylindrical or prismatic roller or the like can be employed in addition to the spherical body 13 shown in FIG. This type of beauty device is used while rotating or rotating a sphere or roller against the skin for the purpose of enhancing or maintaining the skin to the skin such as the face and limbs, or for the purpose of massage effect.

  The resin sliding bearing of the present invention can prevent the elastic deformation part supporting the locking claw for fixing the rotating body from being damaged, and can be manufactured by omitting an independent gate cutting process at the time of injection molding as necessary. Therefore, in a cosmetic device having a sphere or a roller at the tip of the handle, it can be suitably used as a bearing for supporting the sphere or roller.

DESCRIPTION OF SYMBOLS 1 Resin sliding bearing 2 Bearing main body 3 Locking claw 4 Elastic piece 5 Gate trace 6 Boundary part of a bearing main body and an elastic piece 11 Cosmetic device 12 Handle 13 Sphere 14 Support shaft

Claims (8)

A resin sliding bearing that rotatably supports a rotating body on a support shaft,
The resin sliding bearing is an injection molded body formed by injection molding a synthetic resin,
A substantially cylindrical bearing body into which the support shaft can be inserted, a locking claw for fixing the rotating body to the sliding bearing, the locking claw disposed on the outer peripheral side, and the locking claw An elastic piece that can be elastically pushed inwardly into the cylinder of the bearing body,
The elastic piece has a gate mark formed by the injection molding and is formed integrally with the bearing main body.   The locking claw is provided at an end portion of the elastic piece opposite to the length direction of the elastic piece with respect to a boundary portion of the elastic piece with the bearing body, and the gate mark is a center in the length direction of the elastic piece. The resin sliding bearing according to claim 1, wherein the resin sliding bearing is located between the portion and the end of the locking claw.   The resin sliding bearing according to claim 1, wherein the gate mark is located on an inner peripheral side of the elastic piece.   The resin sliding bearing according to claim 3, wherein the gate mark is a gate mark formed by a tunnel gate.   The resin sliding bearing according to any one of claims 1 to 4, wherein a plurality of the locking claws and the elastic pieces are formed at equal intervals on a circumference of the bearing main body.   The resin sliding bearing according to any one of claims 1 to 5, wherein an inner peripheral surface of the elastic piece is in a non-contact state with the support shaft.   The resin sliding bearing according to claim 1, wherein the rotating body is a sphere or a roller. A cosmetic device with a sphere or roller at the tip of the handle,
The spherical body or the roller, which is a rotating body, is rotatably supported via a bearing on a support shaft at the tip of the handle,
The cosmetic device according to any one of claims 1 to 7, wherein the bearing is a resin sliding bearing according to any one of claims 1 to 7.

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