Handrail bracket

Abstract

To provide a handrail bracket of a system for supporting the butt end position of a handrail bar without causing the wobble of the handrail bar due to the deterioration of the effect of a screw during use.SOLUTION: In a handrail bracket for supporting the butt end position of a handrail bar P by fixing the handrail bar P to a mounting face plate part 11b of the handrail bracket with a screw 3 screwed into the center from the butt end side of the handrail bar P, a seat surface 31a of a head part 31 of the screw 3 is formed into a conical shape, and a seat surface 11c of the mounting surface plate part 11b on which the seat surface 31a of the screw 3 sits is formed in a concave shape of a conical surface, and a top angle θ1 of the seat surface 11c is formed to be 5 to 20 degrees larger than a top angle θ3 of the seat surface 31a of the screw 3.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a handrail bracket, and more particularly to a handrail bracket that can be used for a handrail bar made of laminated veneer material. [Background technology]

[0002] 2. Description of the Related Art Conventionally, handrail bars used on stairs, slopes, and the like often use straight pipes made of metal such as stainless steel or aluminum. Although these metal handrails are durable and inexpensive, they tend to feel cold to the touch, so wooden handrails, which have a superior feel, a luxurious appearance and texture, and are warm and gentle on people, have been used for handrails in ordinary homes.

[0003] Traditionally, solid wood such as ash, ash, and rubberwood has been used for wooden handrails. However, in light of the recent problems of depletion of wood resources and rising wood prices, laminated veneer lumber (LVL), which is made by laminating veneers of poplar wood, etc. with their fibers parallel to each other, has been used. Lumber) has been used.

[0004] However, due to structural reasons, it is difficult to screw into handrail bars made of laminated veneer lumber, especially from the end of the grain. In the case of handrail brackets that support the end of the grain of the handrail bar (see, for example, Patent Document 1), when a load is applied, the handrail bar bends, applying a force in the pulling direction to the screws, and as the screws become less effective over time, the handrail bar becomes wobbly. For this reason, handrail brackets for handrail bars made of laminated veneer lumber have been designed to support the middle position of the handrail bar (see, for example, Patent Document 2), rather than a type that supports the end position of the handrail bar. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-23383 A [Patent Document 2] JP 2007-85109 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the handrail bar is short or for reasons of installation location, there has been a demand for supporting the handrail bar made of laminated veneer lumber at its end.

[0007] To provide a handrail bracket that supports the end position of a handrail bar and prevents the bar from becoming unsteady due to a screw becoming weaker during use, in consideration of the problems and demands related to the handrail bar made of laminated veneer material. [Means for solving the problem]

[0008] In order to achieve the above object, the handrail bracket of the present invention supports the end position of a handrail bar by fixing the handrail bar to a mounting panel of the handrail bracket with a screw that is screwed into the centre of the handrail bar from the end side of the bar, and is characterized in that a screw is used whose head has a conical seat, the seating surface of the mounting panel on which the screw seat sits is formed into a concave conical shape, and the apex angle of the seating surface is formed 5° to 20° larger than the apex angle of the screw seat.

[0009] In this case, the screw may have a cylindrical portion between the screw seat and the threaded portion, the cylindrical portion having a diameter larger than the outer diameter of the threaded portion and a length of 1 to 3 mm. Effect of the Invention

[0010] According to the handrail bracket of the present invention, the apex angle of the mounting surface of the mounting plate, which is formed in a concave shape of a cone on which the conical screw seat sits, is set to be 5° to 20° larger than the apex angle of the screw seat, so that even if the handrail bar is bent due to the application of a load, the head of the screw will swing within the mounting surface of the mounting plate, which is formed in a concave shape of a cone, with the base of the screw head as the fulcrum, preventing the screw from being pulled out. This solves the problem of the screw becoming less effective during use and causing the handrail bar to wobble, and in particular, it can support the handrail bar made of laminated veneer lumber, which is difficult to screw into from the end direction, at the end position.

[0011] In addition, by using a screw having a cylindrical portion between the screw seat and the threaded portion, the cylindrical portion having a diameter larger than the outer diameter of the threaded portion and a length of 1 to 3 mm, the head of the screw can be made to swing easily within the seating surface of the mounting panel portion, which is formed in a concave shape of a conical surface, with the cylindrical portion (the base of the screw head) as a fulcrum. [Brief description of the drawings]

[0012] [Figure 1] 1A, 1B, and 1C are overall explanatory views showing one embodiment of a handrail bracket of the present invention, in which FIG. [Diagram 2] 4A and 4B show the screws used in the handrail bracket, with FIG. 4A being a plan view and FIG. [Diagram 3] 4 is a cross-sectional view showing the state in which a handrail bar is supported by the handrail bracket. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the handrail bracket of the present invention will be described with reference to the drawings.

[0014] 1 to 3 show an embodiment of a handrail bracket of the present invention. This handrail bracket, like the handrail bracket disclosed in Patent Document 1, consists of a bracket body 1 and a cover body 2 that is attached to cover the opening of the bracket body 1, and the bracket body 1 is provided with a first mounting portion 11 for attaching the handrail bar P and a second mounting portion 12 for attaching the bracket body 1 to the fixed side W, and is designed to form an opening for operating the fixing members 3, 4, 5 applied to both mounting portions 11, 12, and the cover body 2 is provided with locking claws 21a, 21b for locking the cover body 2 to the bracket body 1.

[0015] The first mounting portion 11 for attaching the handrail bar P consists of a tubular portion 11a which covers the outer circumference of the end portion of the handrail bar P on the buttock side, and a mounting panel portion 11b which supports and fixes the handrail bar P via a screw 3 which serves as a fastening member 3 which screws into the center of the handrail bar P from the buttock side.

[0016] Here, in consideration of workability, the screws 3 used are made of SWCH18A (carbon steel for cold heading) that has been heat treated by carburizing, quenching and tempering to make the threaded portion 33 into a tapping screw specification.

[0017] The screw 3 has a seating surface 31a of the head 31 of the screw 3 formed in a conical shape, and the seating surface 11c of the mounting face plate portion 11b on which the seating surface 31a of the screw 3 is seated is formed in a concave shape of a conical surface, and the apex angle θ1 of the seating surface 11c is formed to be 5° to 20°, preferably 7° to 15° larger than the apex angle θ3 of the seating surface 31a of the screw 3 (in this embodiment, the apex angle θ1 of the seating surface 11c is set to 100° and the apex angle θ3 of the seating surface 31a of the screw 3 is set to 90°, thereby making the apex angle θ1 10° larger. Formation.)

[0018] In addition, the screw 3 may have a cylindrical portion 32 between the seat surface 31a of the screw 3 and the threaded portion 33, the cylindrical portion 32 having a diameter larger than the outer diameter of the threaded portion 33 (in this embodiment, the outer diameter of the threaded portion 33 is formed to be φ4.20 to 4.30 mm, and the outer diameter of the cylindrical portion 32 is formed to be φ4.39 mm) and a length L3 of 1 to 3 mm (in this embodiment, 1.25 mm). The diameter of the circular hole 11d formed adjacent to the seating surface 11c in the mounting plate portion 11b, where the cylindrical portion 32 of the screw 3 is located, is set so that the cylindrical portion 32 of the screw 3 can be inserted with a clearance of 0.1 mm or less.

[0019] The mounting surface plate portion 11b of the first mounting portion 11 for mounting the handrail bar P is formed with a circular hole 11e for screwing in, in addition to the screw 3, an auxiliary screw 4 offset from the center from the end side of the handrail bar P. For the auxiliary screw 4, a tapping screw can be used in consideration of workability. This auxiliary screw 4 can prevent the handrail bar P from rotating.

[0020] According to this handrail bracket, the apex angle θ1 of the seating surface 11c of the mounting panel 11b formed in a concave conical shape on which the seating surface 31a of the conical screw 3 sits is set 5° to 20° larger than the apex angle θ3 of the seating surface 31a of the screw 3. This allows the head 31 of the screw 3 to swing within the seating surface 11c of the mounting panel 11b formed in a concave conical shape, with the base of the head 31 of the screw 3 as a fulcrum, even if the handrail bar P is bent due to the application of a load, thereby preventing the application of a force in the direction of pulling out the screw 3. This solves the problem that the screw 3 becomes less effective during use and the handrail bar P becomes unsteady, and in particular, the handrail bar P made of laminated veneer material, which is difficult to screw from the end direction, can be supported at the end position.

[0021] Furthermore, by using a screw 3 having a cylindrical portion 32 between the seat surface 31a of the screw 3 and the threaded portion 33, the cylindrical portion 32 having a diameter larger than the outer diameter of the threaded portion 33 and a length L3 of 1 to 3 mm, the head 31 of the screw 3 can be made to swing easily within the seating surface 11c of the mounting plate portion 11b, which is formed in a concave shape of a conical surface, with the cylindrical portion 32 (the base of the head 31 of the screw 3) as a fulcrum.

[0022] The above describes the handrail bracket of the present invention based on its embodiment, but the present invention is not limited to the configuration described in the above embodiment, and the configuration can be changed as appropriate within the scope of the spirit of the present invention. [Industrial Applicability]

[0023] The handrail bracket of the present invention has the characteristic that the screws will not become weaker over time and the handrail bar will not become wobbly, and therefore can be widely used as a handrail bracket that supports the end position of wooden handrail bars, in addition to handrail bars made from laminated veneer lumber. [Explanation of symbols]

[0024] 1 Bracket body 11 First mounting part 11a Cylindrical part 11b Mounting face plate part 11c Seating surface 11d circular hole 11e circular hole 12 Second mounting part 2 Cover body 21a Locking claw 21b Locking claw 3 Screws (fixing parts) 31 Head 31a Seat 32 Cylinder section 33 Screw part 4 Auxiliary screw (fixing member) 5. Fastening member θ1 Apex angle of seating surface θ3 Apex angle of the seating surface L3 Length of the cylindrical part P Handrail bar W Fixed side

Claims

1. This handrail bracket supports the end position of a handrail bar by fixing the handrail bar to a mounting panel of the handrail bracket with a screw that is screwed into the center of the end of the handrail bar, and is characterized in that a screw with a conical bearing surface at the head of the screw is used, and the bearing surface of the mounting panel on which the screw bearing surface sits is formed into a concave conical shape, and the apex angle of the bearing surface is formed 5° to 20° larger than the apex angle of the screw bearing surface.

2. The handrail bracket according to claim 1, characterized in that the screw has a cylindrical portion between the screw seat and the threaded portion, the cylindrical portion having a diameter larger than the outer diameter of the threaded portion and a length of 1 to 3 mm.

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