JP2008240399A - Grip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grip having reduced local stress concentration when a load operates thereon. <P>SOLUTION: The grip 1 comprises a grip body 2 to be fixed to a mounting face 101, and four rib parts (stress concentration reducing parts) 10-13. The four rib parts 10-13 are provided on two end faces (the opposed faces) 3 at both ends of the grip body 2 opposed to the mounting face 101. When a downward load operates on the grip body 2, the lower edges of the end faces 3 are pushed toward the mounting face 101. At this time, the rib parts 10-13 laid between the mounting face 101 and the end face 3 contact the mounting face 101 and are elastically deformed to be deflected. As compared with the case that the rib parts 10-13 are not provided, their contact area with the mounting face 101 is larger and so stress on the grip body 2 is dispersed. The stress on the grip body 2 is reduced by the elastic deformation of the rib parts 10-13, thus reducing stress concentration on the grip body 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a grip used as, for example, an auxiliary tool that supports the body.

  For example, grips are known which are attached to the inner wall of a bathtub or the wall surface of a bathroom and assist the bather's operation during bathing. Such a grip is used, for example, for the bather to stabilize his / her posture in the bathtub or to assist the operation of standing up when leaving the bathtub. When a person performs various actions while being caught in this grip, a load for supporting the weight of the person or a large load momentarily acts on the grip. The grip is required to withstand such a large force.

  Such a grip is generally fixed to a wall surface using bolts and nuts. As disclosed in Patent Documents 1 and 2, when the grip is attached to the inner wall of the bathtub, a ring-shaped packing made of rubber or the like is interposed between the grip and the attachment surface. Sometimes. This packing is for preventing water from leaking from a hole opened in the bathtub for attaching the grip.

Japanese Patent Laid-Open No. 7-59674 Japanese Patent Laid-Open No. 9-65999

  By the way, the direction of the load acting on the grip varies depending on the mounting location of the grip and the purpose of use. When a load component in a direction parallel to the mounting surface is applied to the grip, only a part of the grip is pressed against the mounting surface, and the entire load is applied to this part. As a result, a large stress is concentrated on this part. For example, when a person moves up while gripping the grip, a downward load is mainly applied to the grip. At this time, the lower edge portion of the mounting seat surface of the grip is pressed against the mounting surface, and a large stress is locally generated. If the grip is continuously used, in the worst case, there arises a problem that the grip is damaged such as plastic deformation or crack. Further, the reaction force from the grip acts on the mounting surface in contact with the grip at that time, and there is a possibility that a crack may occur.

  Moreover, since the packing currently disclosed by patent document 1, 2 is for preventing water leak, it is arrange | positioned between a grip and an attachment surface in the state compressed between the attachment surface and a grip. Yes. Therefore, even if a load acts on the grip and the packing is pressed against the mounting surface, there is little room for the packing to elastically deform. Therefore, it is difficult to absorb the external force by the packing and reduce the stress acting on the grip. Therefore, regardless of the presence or absence of packing, when a load is applied to the grip, there arises a problem that stress is concentrated on the contact portion between the grip and the mounting surface. Therefore, it is desirable to relieve this locally generated stress.

  Then, an object of this invention is to provide the grip which relieves the local concentration of the stress when a load acts.

Means for Solving the Problems and Effects of the Invention

  The grip according to claim 1 is provided in a partial region of a grip body fixed to the mounting surface and a surface of the grip body facing the mounting surface, and the grip body has a load in a direction parallel to the mounting surface. When a component acts and a partial region of the facing surface is pressed toward the mounting surface, the stress concentration generated in the grip body is reduced between the mounting surface and the facing surface. And a stress concentration alleviating part.

  When a load component in a direction parallel to the mounting surface is applied to the grip body fixed to the mounting surface, the stress concentration alleviating portion comes into contact with the mounting surface. Since the contact area increases compared to the case where the opposing surface of the grip body is in direct contact with the mounting surface, the stress generated in the grip body can be dispersed. Therefore, it is possible to prevent a large stress from acting locally on the grip body. Therefore, damage to the grip body can be prevented. At the same time, the stress acting on the mounting surface in contact with the stress concentration relaxation portion can also be dispersed. Therefore, damage to the mounting surface can be prevented.

  A grip according to a second aspect is the grip according to the first aspect, wherein the stress concentration relaxation portions extend in a direction perpendicular to the direction of the load component along the facing surface, and are arranged side by side in the direction of the load component. It is characterized by comprising a plurality of rib portions. Thereby, when a load acts on the grip body fixed to the mounting surface, the rib portion and the mounting surface come into contact with each other. By deforming the rib portion, the stress acting on the grip body can be reduced.

  The grip of claim 3 is characterized in that, in claim 1, the stress concentration relaxation portion is formed of an elastomer. Thereby, when a load acts on the grip body fixed to the mounting surface, the stress concentration relaxation portion interposed between the opposing surface of the grip body and the mounting surface is compressed and deformed. Therefore, the stress acting on the grip body can be reduced.

  A grip according to a fourth aspect of the present invention is the grip according to any one of the first to third aspects, wherein the stress concentration relaxation portion is fixed to the mounting surface and is orthogonal to the mounting surface when the load component is not acting. It is characterized by not receiving direction force. Thereby, when a load acts on the grip body fixed to the mounting surface, the stress concentration alleviating portion is easily deformed. Therefore, the ability to absorb the stress of the stress concentration relaxation portion can be efficiently used.

  Next, a first embodiment of the present invention will be described. The grip 1 of the present embodiment is attached to, for example, an inner wall of a bathtub, a wall surface of a bathroom, a wall surface of a toilet, and the like, and is used to assist a bather or the like when taking a bath.

  As shown in FIG. 1, the grip 1 of this embodiment is being fixed to the attachment surface 101 of the wall part 100 parallel to a perpendicular direction. In the following description of the grip 1, the direction orthogonal to the mounting surface 101 is defined as the front-rear direction, the direction parallel to the mounting surface, the horizontal direction as the left-right direction, and the vertical direction of the mounting surface 101 as the vertical direction. .

  Further, it is assumed that a load is applied to the grip 1 in a downward direction parallel to the mounting surface 101 when gripped by the user.

  As shown in FIG. 1, the grip 1 includes a grip body 2, four rib portions 10 to 13, and an insert bolt 4. The four rib portions 10 to 13 correspond to stress concentration relaxation portions.

  The grip body 2 is formed in a shape in which both ends of the cylindrical body are bent, and has two flat end surfaces (opposing surfaces) 3 at both ends. The grip 1 is fixed to the mounting surface 101 so that the longitudinal direction of the grip body 2 coincides with the left-right direction.

  The grip body 2 is made of a synthetic resin, and is produced by, for example, an injection molding method. Examples of the synthetic resin include polypropylene resin, ABS resin, polyethylene resin, acrylic resin, polyamide resin, and polycarbonate resin.

  As shown in FIGS. 1 and 2, the two end surfaces 3 of the grip body 2 are surfaces facing the attachment surface 101 when the grip body 2 is attached to the attachment surface 101. As shown in FIG. 3, when viewed from the mounting surface 101 side, the end surface 3 is formed in an elliptical shape.

  As shown in FIGS. 1 and 2, two insert bolts 4 are integrally fixed to the two end surfaces 3 of the grip body 2. That is, the bolt head 6 side of the insert bolt 4 is embedded in the grip body 2, and the screw portion 5 of the insert bolt 4 protrudes from the center portion of the end surface 3.

  In order to attach the grip body 2 to the attachment surface 101, the packing 20 is externally fitted to the screw portion 5 of the insert bolt 4, and the screw portion 5 is inserted into the bolt through hole 102 formed in the wall portion 100. Then, the nut 21 is screwed into the screw portion 5 that has passed through the bolt through hole 102 and tightened. At this time, a slight gap is formed between the end surface 3 and the mounting surface 101 due to the interposed packing 20 in a compressed state.

Next, the rib parts 10-13 are demonstrated in detail.
As shown in FIG. 2, the four rib portions 10 to 13 are provided on the lower side of the end surface 3 and are each formed of a synthetic resin. Examples of the synthetic resin include polypropylene resin, ABS resin, polyethylene resin, acrylic resin, polyamide resin, and polycarbonate resin.

  As shown in FIG. 2, the rib portions 10 to 13 protrude outward in a direction (front-rear direction) orthogonal to the end surface 3. As shown in FIG. 3, when viewed from the mounting surface 101 side, the rib portions 10 to 13 extend in the left-right direction and are arranged in the vertical direction. Furthermore, as shown to Fig.4 (a), the distance of the protrusion end surfaces 10a-13a of the rib parts 10-13 and the end surface 3 is mutually equal. That is, the protruding amounts from the end surface 3 of each of the rib portions 10 to 13 are all the same.

  As shown in FIG. 4A, when no load is applied to the grip body 2, the protruding end surfaces 10 a to 13 a of the rib portions 10 to 13 are separated from the mounting surface 101. That is, when no load is applied to the grip body 2, the rib portions 10 to 13 do not receive a force in a direction orthogonal to the mounting surface 101.

Next, a case where a load is applied to the grip 1 will be described.
First, the case where the rib parts 10-13 are not provided is demonstrated. When a downward load is applied to the grip body 2, the lower edge portion of the end surface 3 is pressed against the mounting surface 101. Accordingly, a large stress acts on the lower edge portion of the end surface 3. Therefore, the grip body 2 may be damaged. Furthermore, since a large stress is also generated on the mounting surface 101 in contact with the end surface 3, the mounting surface 101 may be damaged.

  In the case of the grip 1 of the present embodiment, when a downward load is applied to the grip body 2, when the lower edge portion of the end surface 3 is pushed toward the mounting surface 101 as shown in FIG. The rib portions 10 to 13 provided below are in contact with the mounting surface 101.

  Specifically, first, the protruding end surface 13 a of the lowermost rib portion 13 comes into contact with the mounting surface 101. When a load is further applied in a state where the protruding end surface 13a is pressed against the mounting surface 101, the rib portion 13 is elastically deformed and bent. When the rib part 13 bends, the length of the rib part 13 in the front-rear direction is shortened, so that the rib part 12 above the rib part 13 comes into contact with the mounting surface 101 and deforms. Similarly, when the load increases, the rib portions 11 and 10 sequentially contact the mounting surface 101 and deform. Ultimately, the protruding end surfaces 10 a to 13 a are all in contact with the mounting surface 101. Therefore, compared with the case where only the lower edge portion of the end surface 3 is in direct contact with the mounting surface 101, the contact area increases, so that the stress generated in the grip body 2 is dispersed. Moreover, stress is reduced because each rib part 10-13 elastically deforms according to the magnitude | size of a load. Therefore, the rib portions 10 to 13 are interposed between the end surface 3 and the mounting surface 101, so that stress concentration generated in the grip body 2 can be reduced. Therefore, damage to the grip body 2 can be prevented. At the same time, since the reaction force that the mounting surface 101 receives from the grip 1 is also reduced, the stress concentration generated on the mounting surface 101 can be reduced. Therefore, damage to the mounting surface 101 can be prevented.

  In addition, the protrusion amount from the end surface 3 of the rib parts 10-13 may not be the same. For example, the protrusion amount may increase in order from the upper end.

  Further, the number of rib portions is not limited to four, and may be three or five or more, for example. It is appropriately set according to the material and shape of the rib portion.

  Next, a second embodiment of the present invention will be described. However, about the thing which has the structure similar to 1st embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted suitably.

  As shown in FIG. 5, a contact seat surface 14 is provided below the end surface 3 of the grip 1 of the present embodiment. The contact seat surface 14 corresponds to a stress concentration relaxation portion and is formed of an elastomer. Elastomers include rubber and thermoplastic elastomers. Rubber materials include nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), ethylene / propylene rubber (EPM), ethylene / propylene / diene / monomer (EPDM), Examples thereof include fluorine rubber and silicon rubber. Examples of the thermoplastic elastomer include styrene block copolymer (SBC), thermoplastic olefin (TPO), and thermoplastic polyurethane (TPU).

  As shown in FIG. 5, when viewed from the mounting surface 101 side, the contact seat surface 14 is formed in an elliptical shape that is long in the left-right direction. Further, as shown in FIG. 6A, the contact seat surface 14 protrudes outward in a direction (front-rear direction) perpendicular to the end surface 3. The protruding end surface 14 a of the contact seat surface 14 is parallel to the end surface 3.

  As shown in FIG. 6A, when no load is applied to the grip body 2, the protruding end surface 14 a of the contact seat surface 14 is separated from the mounting surface 101. That is, when no load is applied to the grip body 2, the contact seat surface 14 does not receive a force in a direction orthogonal to the mounting surface 101.

  When a downward load is applied to the grip body 2, as shown in FIG. 6B, the protruding end surface 14 a of the contact seat surface 14 contacts the mounting surface 101, and the contact seat surface 14 is compressed and deformed.

  Specifically, when a load is applied to the grip body 2, the contact seat surface 14 receives an external force from the mounting surface 101 in a direction orthogonal to the mounting surface 101 and is compressed between the mounting surface 101 and the grip body 2. . When the contact seat surface 14 is compressed and contracted, the contact seat surface 14 expands in a direction along the mounting surface 101. As the contact seat surface 14 is compressed and deformed in this manner, the external force is absorbed and the stress generated in the grip body 2 is reduced. Moreover, since the contact area increases compared with the case where the lower edge part of the end surface 3 contacts the attachment surface 101 directly, the stress which arises in the grip main body 2 is disperse | distributed. Therefore, the stress concentration generated in the grip body 2 can be reduced by the contact seating surface 14 being interposed between the end surface 3 and the mounting surface 101. At the same time, since the reaction force acting on the mounting surface 101 is also reduced, stress concentration occurring on the mounting surface 101 can be relaxed.

  Further, the larger the Poisson's ratio, the greater the elasticity of the contact seat surface 14 and the greater the action of absorbing external force. Therefore, it is preferable to use a material having a large Poisson's ratio as the material of the contact seat surface 14. For example, it is preferable to use an elastomer having a Poisson's ratio in the range of 0.4 to 0.5.

  The protruding end surface 14 a of the contact seat surface 14 may not be parallel to the end surface 3. For example, the protruding end surface 14 a may be inclined with respect to the end surface 3 so that the protruding amount of the upper portion of the contact seat surface 14 is larger than the protruding amount of the lower portion.

  Further, the shape of the contact seat surface 14 is not limited to an elliptical shape that is long in the left-right direction. For example, it may be polygonal. Moreover, the shape divided | segmented into 2 or more may be sufficient.

  Moreover, the contact seat surface 14 is not restricted to what is formed with an elastomer. It may be formed of a synthetic resin or the like.

  The first embodiment and the second embodiment can be modified as follows.

1] The rib portions 10 to 13 or the contact seat surface 14 do not have to protrude in a direction (front-rear direction) orthogonal to the end surface 3. It may be formed to protrude in an oblique direction with respect to the end surface 3.

2] The rib portions 10 to 13 or the contact seat surface 14 are not limited to those separated from the mounting surface 101 when no load is applied to the grip body 2. The ribs 10 to 13 or the contact seat surface 14 may contact the mounting surface 101 and receive a force in a direction orthogonal to the mounting surface 101 from the mounting surface 101 as long as there is sufficient room for deformation. .

3] The position where the rib portions 10 to 13 or the contact seating surface 14 are provided is not limited to the lower side of the end surface 3, and may not be one. It is set as appropriate according to the direction in which the load acts. For example, when both upward and downward loads are applied to the grip body 2, the rib portions 10 to 13 or the contact seat surface 14 are provided in the upper and lower end regions of the end surface 3, respectively.

4] The attachment direction of the grip 1 is not limited to the direction in which the longitudinal direction of the grip body 2 coincides with the left-right direction. It is appropriately set according to the purpose of use of the grip 1. For example, you may attach so that the longitudinal direction of the grip main body 2 may turn into an up-down direction.

It is longitudinal direction sectional drawing when the grip which concerns on 1st embodiment of this invention is attached. It is the II-II sectional view taken on the line of FIG. It is a partial side view of a grip. (A) is the elements on larger scale when the load is not acting, (b) is the elements on larger scale when the load acts on the grip. It is a partial side view of the grip which concerns on 2nd embodiment of this invention. (A) is the elements on larger scale when the load is not acting, (b) is the elements on larger scale when the load acts on the grip.

Explanation of symbols

1 Grip 2 Grip body 3 End face (opposite face)
10, 11, 12, 13 Rib part (stress concentration relaxation part)
14 Contact seat (stress concentration alleviation part)
101 Mounting surface

Claims (4)

A grip body fixed to the mounting surface;
The grip body is provided in a partial region of the surface facing the mounting surface, and a load component in a direction parallel to the mounting surface acts on the grip body, so that the partial region of the facing surface is the mounting surface. A stress concentration alleviation part that relieves stress concentration generated in the grip body by being interposed between the mounting surface and the facing surface when pressed against
Grip characterized by having.   Each of the stress concentration relaxation portions includes a plurality of rib portions that extend in the direction orthogonal to the direction of the load component along the facing surface and are arranged in the direction of the load component. The grip according to claim 1, wherein   The grip according to claim 1, wherein the stress concentration relaxation portion is formed of an elastomer.   The stress concentration relaxation portion is fixed to the mounting surface and does not receive a force in a direction perpendicular to the mounting surface when the load component is not applied. The grip according to any one of the above.

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