JP3400202B2 - handrail - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handrail which can be suitably used in a high-temperature and high-humidity environment such as a bathroom. 2. Description of the Related Art Handrails are attached to the walls of bathrooms and toilets of ordinary households so that they can be used by putting them in and out of bathtubs, sitting on toilets, and standing up. Has been widely used. [0003] As a handrail for a bathroom, there is, for example, one described in Japanese Utility Model Publication No. 5-12424. This is to cover the metal inner tube with a synthetic resin sleeve so that there is no gap at the end of the sleeve even if there is a difference in thermal expansion between the metal and the synthetic resin. FIG. 6 shows a cross section of the portion. The handrail is composed of an inner tube 51 using a metal tube and a sleeve 52 made of a synthetic resin which is extrapolated and integrated on the surface thereof. (Not shown) is connected and fixed to the inner tube 51 by a bolt. And
A ring 54 for restricting expansion and contraction in order to prevent a gap between the end of the sleeve 52 and the curved tube due to a difference in thermal expansion between the sleeve 52 and the sleeve 52 having a larger coefficient of thermal expansion than the inner tube 51. Abuts against the end face of the inner tube 51 and is screwed into the sleeve 52. Also, projections 51a are provided at appropriate positions on the outer peripheral surface of the inner tube 51, and these projections 51a are cut into the inner peripheral surface of the sleeve 52 made of synthetic resin, so that the sleeve 52 is It is prevented from turning around 50. As described above, the provision of the ring 54 eliminates the generation of a gap between the sleeve 52 and the curved tube due to the difference in thermal expansion between the inner tube 51 and the sleeve 52, and provides the projection 51a on the inner tube 51. This prevents the sleeve 52 from rotating, and allows the user to safely grip and use the sleeve 52. [0007] However, the sleeve 5
Both the ring 54 and the projection 51a are indispensable to prevent the generation of a gap between the tube 2 and the curved tube and the rotation of the sleeve 52. For this reason, the assembly of the handrail requires the inner tube 5
After inserting 1 into the sleeve 52, it is necessary to screw the ring 54 into the end of the sleeve 52. In such an assembly, it is necessary to form a projection 51a on the inner tube 51, and a sleeve 52
In addition, processing to cut female threads is required. Therefore, the number of processing steps for the inner tube 51 and the sleeve 52 increases,
Affects cost. In the assembly, when the inner tube 51 is inserted into the sleeve 52, the projection 51a of the inner tube 51 is inserted while biting into the inner peripheral wall of the sleeve 52. For this reason, the sleeve 52 and the inner pipe 5
1 requires a considerably large force, and using a dedicated assembling jig is not preferable in terms of productivity such as a long working time. As described above, in the conventional handrail, members for preventing the sleeve from rotating and preventing the generation of a gap are separately provided, and thus there is a problem that the workability of assembling is inferior mainly. . The problem to be solved in the present invention is to reduce the number of parts and to assemble the handrail easily by using a single member to prevent the sleeve from rotating and prevent the occurrence of a gap due to the difference in expansion from the inner tube. To provide. The present invention has a double-pipe structure in which a synthetic resin sleeve is fitted around the outer circumference of a metal inner pipe, and is fixed to both ends of the inner pipe on the building side. A handrail provided with a bush connected to a fixed tool, the bush having a restraining means for engaging the inner periphery of the sleeve and restricting displacement in the axial direction and the circumferential direction thereof. To
Wherein the restraining means has a core
The inner circumference of the sleeve is connected while restricting the rotation around the inner circumference.
The restraining ring has an outer shape that cuts into the wall.
Protrudes radially on its inner and outer circumferences, respectively.
A plurality of restraining projections and engagement projections, at least
The engaging projections are made elastically deformable and
The diameter of the virtual circle drawn by the tip of the projection is
Is slightly larger, and the bush is
Engage with the restraining protrusion on the peripheral surface where the ring is extrapolated
It is characterized by having a ridge having a relationship . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A restraining means provided on a bush provided at an end of an inner tube regulates a displacement in a circumferential direction by engaging with an inner periphery of a sleeve. Prevents the sleeve from slipping around the inner tube. In addition, since the restraining means restrains the sleeve so as to also restrict the displacement of the sleeve in the axial direction, even when the sleeve having a larger coefficient of thermal expansion than the inner tube is about to expand and contract, the restraining means may be used. It is regulated to follow the pipe, and such deformation is prevented. Therefore, the torsional deformation around the core of the sleeve can be prevented only by the restraining means, and the length of the inner tube and the sleeve can be adjusted. When the restraining means is an annular restraining ring, rotation around the core is restricted with respect to the bush, so that the outer peripheral edge of the restraining ring is cut into the inner circumferential wall of the sleeve so that the axial line of the sleeve is formed. If the displacement in the direction can be restricted and the sleeve is dispersed and bites into the inner circumferential wall of the sleeve in the circumferential direction, deformation of the sleeve around the inner tube is prevented. Further, in the case where the restraining ring is provided with the restraining protrusion and the engaging protrusion, the engagement between the protrusion of the bush and the restraining protrusion can restrict the displacement of the restraining ring around the center of the bush and connect the restraining ring. By engaging a plurality of elastically deformable engagement projections with the inner peripheral wall of the sleeve, expansion and contraction deformation in the axial direction of the sleeve is restricted to the inner tube side, thereby restricting the deformation and simultaneously preventing displacement in the circumferential direction. You. FIG. 1 is a partially cutaway view showing a handrail of the present invention fixed to a wall. In the figure, the handrail is fixed to the wall by fixing members 11 and 12 which are common members disposed at both upper and lower ends and a T-shaped fixing member 13 provided at an intermediate portion. Straight handrail tube 1 between each of
Are connected. The fixtures 11 to 13 are fixed by screws 14 which are screwed into the walls, respectively, and are appropriately arranged so that no gap is formed between the fixtures 11 and 13 and the end of the handrail tube 1. The handrail tube 1 is formed by externally attaching a synthetic resin sleeve 3 to the outer periphery of a metal inner tube 2 as described in the section of the prior art. The bush 4 for connecting to the fixtures 11 to 13 is fitted into the inner tube 2. FIG. 2 is an enlarged vertical sectional view showing a connecting portion between the handrail tube 1 and the fixture 11, FIG. 3 is a vertical sectional view showing details of both ends of the handrail tube 1, and FIG. FIG. The bush 4 is made of a synthetic resin. As shown in FIG. 3, a part to be inserted into the inner tube 2 is a cylindrical head 4a, and a metal joining part is included in the head 4a. A plurality of recesses 4b are formed at a plurality of locations on the outer peripheral surface of the head 4a, and a flange 4c that abuts against the end surface of the inner tube 2 is provided at one end of the surface facing outward. ing. When inserted into the inner pipe 2, the flange 4c is seated on the end face of the inner pipe 2, and the peripheral wall of the inner pipe 2 is caulked and formed in accordance with the position of the concave portion 4b to form the inner pipe 2 as shown in FIG. Into the recesses 4b, the inner tube 2 can be partially engaged with these recesses 4b. Therefore, the bush 4 is coupled to the inner pipe 2 with its axial position restricted by the recess 4b and the flange 4c. Further, a restraining ring 6 for causing the sleeve 3 to follow the expansion and deformation of the inner pipe 2 in the axial direction is incorporated outside the flange 4c. This restraining ring 6 is made of a metal plate, and has four restraining projections 6 at four locations on the inner circumference for preventing rotation, as shown in FIG.
a, and an engagement protrusion 6b is formed on the outer periphery so as to bite into the inner periphery of the sleeve 3 to apply an engagement force in the axial direction. The engagement projection 6 b is formed by making the diameter of a virtual circle drawn by these outer peripheral edges slightly larger than the inner diameter of the sleeve 3. In order to install the restraining ring 6 so as not to rotate around the center of the bush 4, a plurality of ridges 4d are provided outside the head 4a as shown in FIG. These ridges 4d are formed in a gear shape, and are formed at a pitch such that two adjacent ridges 4d can be inserted between the restraining projections 6a shown in FIG. Therefore, as shown in FIG. 4, the restraining ring 6 is incorporated so as not to rotate around the bush 4 by the engaging force between the ridge 4d and the restraining protrusion 6a, and the inner tube to which the bush 4 is integrally joined. 2 is also restricted from rotating.
An engagement groove 4e for receiving a fixing screw 15 (see FIG. 2) which is screwed from a peripheral surface of each of the fixing tools 11 to 13 is provided at a distal end portion of the fixing tool 11 projecting outward from the inner tube 2. This engagement groove 4e is
In the illustrated example, a portion extending from the flange 4c to the tip is formed as a ridge 4d, and the ridge 4d is cut off to form the entire circumference. Incidentally, in FIG. 2, the bush 4
Is shown, the other fixtures 12, 13
The same is true for the connection to. In the above configuration, both ends of the inner pipe 2
As shown in FIG. 3, the bush 4 is fitted into each, and then the sleeve 3 is extrapolated to the inner tube 2 and assembled. As described above, the bush 4 is caulked to engage the inner tube 2 with the concave portions 4b provided at a plurality of positions on the peripheral surface, whereby the rotation of the bush 4 around the core of the inner tube 2 is regulated. The position of the flange 4c in the axial direction is also restricted by abutting on the end face of the inner tube 2. After assembling the bush 4 into the inner tube 2,
The inner tube 2 is inserted into the sleeve 3 and integrated as shown in FIG. The axial length of the sleeve 3 is slightly longer than that of the inner tube 2, and the inner tube 2 and the sleeve 3 are positioned so that the flange 4 c is located deeper than the end of the sleeve 3. Have a dimensional relationship. Next, the restraining ring 6 is fitted into the sleeve 3 as shown in FIG. 4 as a positional relationship between the ridge 4d and the restraining protrusion 6a. At this time, the engagement protrusion 6b of the restraining ring 6
Since the diameter of the imaginary circle drawn by is slightly larger than the inner diameter of the sleeve 3, these engaging projections 6 b are deformed in the opposite direction to the insertion direction into the sleeve 3 as shown in FIG. It will bite into the inner wall. Therefore,
When the restraining ring 6 abuts against the flange 4c, the restraining ring 6 is held at the position shown in the figure by the restraint in the axial direction by the flange 4c and the elastic reaction force received from the sleeve 3 by the engaging projection 6b. After assembling the restraining ring 6, as shown in FIG.
Then, the fixing pin 15 and the tip of the bush 4 are inserted, and the fixing screw 15 is screwed from the outside of the fixing tool 11 and pushed into the engaging groove 4 e of the bush 4. As a result, the tip of the fixing screw 15 presses the bottom of the engagement groove 4e, and the bush 4
At the same time as being integrally connected to the fixture 11, the engagement between the engagement groove 4e and the fixing screw 15 prevents the detachment. The restraining ring 6 has a restraining projection 6a.
The rotation of the bush 4 around the center is restricted by the engagement between the bush 4 and the ridge 4d of the bush 4, so that the restraining ring 6 does not rotate with respect to the inner tube 2. And the restraint ring 6
The plurality of engagement protrusions 6b located on the outer periphery of the sleeve 3
Of the sleeve 3 is distributed in the circumferential direction of the sleeve 3, so that the rotation of the sleeve 3 around the inner tube 2 is restricted at both ends in the axial direction by the engagement projections 6b. . Therefore, even if the sleeve 3 is gripped by hand and twisted, the sleeve 3 made of synthetic resin does not deform around the inner tube 2 and the appearance does not collapse. The engaging projection 6b of the restraining ring 6 is
As shown in the figure, the sleeve 3 is deformed so that its tip side is slightly inclined in a direction away from the end face of the inner tube 2,
Dig into the inner circumference of For this reason, the metal inner tube 2
Even if the synthetic resin sleeve 3 having a higher coefficient of thermal expansion than the inner tube 2 attempts to expand or contract in the axial direction due to a temperature change, the engagement protrusion 6 of the restraining ring 6 integrated with the inner tube 2 is used.
Since the sleeve 3 is restrained by the inner pipe 2 by the b, the sleeve 3 is restrained by the inner pipe 2 and such deformation is prevented. As described above, the deformation of the sleeve 3 due to the difference in thermal expansion between the sleeve 3 and the inner tube 2 is prevented, and at low temperatures, a gap may be formed between the joints 11 and 13 at low temperatures. In addition, at high temperatures, it is possible to prevent deformation such that the end of the shrink sleeve 3 bulges outward at the joint portion with the fixtures 11 to 13, and the sleeve 3 always has a good appearance regardless of a change in temperature. Can be kept. According to the present invention, the restraining means connected to the bush can prevent the torsion deformation around the inner tube of the synthetic resin sleeve, and at the same time, the gap between the sleeve and the fixture can be prevented. It is possible to obtain a construction body which is free from occurrence of swelling and swelling of sleeve meat. By using a restraining ring as a restraining means, the rotation of which around the core is restricted with respect to the bush, the number of parts is reduced and the assembling work is performed as compared with the case where two members are conventionally required. Is even easier.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway view showing a construction example of a handrail of the present invention. FIG. 2 is an enlarged longitudinal sectional view of a main part showing a connecting portion between a handrail tube and a fixture. FIG. 3 is an enlarged vertical sectional view showing both ends of a handrail tube. FIG. 4 is a left side view of FIG. 3, showing a connection between a restraining ring and a bush and an arrangement of restraining protrusions. 5A and 5B are details of a restraining ring, wherein FIG. 5A is a front view seen in an axial direction, and FIG. 5B is a right side view thereof. FIG. 6 is a longitudinal sectional view of a main part showing a conventional handrail. [Description of Signs] 1: Handrail tube 2: Inner tube 3: Sleeve 4: Bush 4a: Head 4b: Recess 4c: Flange 4d: Ridge 4e: Engagement groove 5: Joint pin 6: Restriction ring 6a: Restriction protrusion 6b: engaging projection 11: fixing tool 11a: mounting hole 12: fixing tool 13: fixing tool 14: screw 15: fixing screw

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kunihiko Otaki 1807-4 Nakano, Kamitakano, Yachiyo-shi, Chiba Prefecture Inside the Chiba Plant of Takagi Kogyo Co., Ltd. (72) Inventor Toyoyoshi Matsumura 1807-4 Nakano, Kamitakano, Yachiyo-shi, Chiba Takagi Kogyo Co., Ltd. Chiba Plant (56) References JP 3-50139 (JP, U) JP 1-114739 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04F 11/18 A47K 3/12

Claims (1)

(57) [Claims 1] A double pipe structure in which a sleeve made of synthetic resin is fitted around the outer circumference of a metal inner pipe, and fixed at both ends of the inner pipe to the building side. A handrail provided with a bush connected to the tool, the bush having a restraining means for engaging with an inner periphery of the sleeve and restricting displacement in an axial direction and a circumferential direction thereof . And the restraining means rotates around the core with respect to the bush.
The sleeve is connected so as to restrict rolling and bites into the inner peripheral wall of the sleeve.
The restraining ring has a contour that fits inside.
Multiple protruding radially on the inner and outer circumference of
A restraining projection and an engagement projection, at least the engagement projection
Part is elastically deformable and
Make the diameter of the virtual circle drawn by the end slightly smaller than the inner diameter of the sleeve
Larger, and furthermore, the bush is provided with the restraining ring.
The peripheral surface of the part to be extrapolated has
Handrail with ridges .