JP2002052296A - Hook for hanging on pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hook for hanging on a pole developing strong fastening force for cramping a pole or the like with big force. SOLUTION: The hook for hanging on a pole has a hook part 11 which extends from a lower side toward an upper side of the pole or the like 10 and turns around at the upper side and again extends toward the lower side so as to generally surround the pole or the like 10, and at least three projection parts 15, etc., provided inside the hook part 11 so as to contact with an outer periphery face of the pole or the like 10 for catching the pole or the like 10. Each of the projection parts 15 has a supporting part 16 which is linearly contacted with the outer periphery surface of the pole or the like 10 and is parallel with an axial direction of the pole or the like 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook for hanging on a rod or the like.

[0002]

2. Description of the Related Art For example, hangers and various clothes dryers are
Although the hook is hung on a clothesline or the like by a hook, the hook has no fixing force to the pole or the like, or is weak even if it has a weak force. For this reason, a mechanism for pressing a rod inside a hook has been proposed, as shown in Japanese Utility Model Application Laid-Open Nos. 58-119388 and 62-23698. However, with such a mechanism, the hook is easy to move, so that if it is shaken by the wind, the fixing effect cannot be maintained.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a rod hook for tightening rods with a large force and exhibiting a strong fixing force. is there.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a hook for hanging a pole according to the present invention has a shape having a shape in which it goes around from the bottom of a pole to the top and goes downward again to substantially surround the pole. And at least three protrusions provided inside the hook portion so as to be in contact with and pinch the outer peripheral surface of the rod, wherein the protrusion is capable of linearly contacting the outer peripheral surface of the rod. And a support portion parallel to the axial direction.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION
It is a hook for hanging on rods and stopping it from moving. The rods include clothes rods and those having a circular cross-sectional shape equivalent thereto. The hook has a hook portion having a shape substantially surrounding the rod, which goes upward from above the rod and goes downward again. Therefore, the hook portion has a larger diameter than the rods. Further, in terms of having a shape that can be hooked on a rod or the like, it can be considered that the present invention also has a configuration equivalent to that of a conventional hook portion.

The hook portion has at least three projections provided inside the hook portion so as to contact and stop the outer peripheral surface of the rods. That is, since the rods are sandwiched by at least three projections, these projections are arranged to surround the outer peripheral surface of the rods. It is desirable that the hook portion be provided with a portion that is parallel when the rods are mounted, and that four protruding portions be provided inside the hook portion (FIGS. 2 and 3).

[0007] It is assumed that the projecting portion linearly contacts the outer peripheral surface of the rods, and that the line extends in parallel with the axial direction of the rods. The portion of the projection that is in line contact with the rods is the support. Examples of the protrusion having a support portion capable of line contact include a semi-cylindrical one and a triangular one shown in the embodiment.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 shows an example of a hanger having a hook for hanging a rod according to the present invention. A hook 11 having an outer shape substantially surrounding a rod 10 is attached to a hanger main body 12 by a shaft 1 at a lower end.
3 and has a downwardly oriented rod insertion port 14 at the lower end of the parallel portion.

The hook of the first embodiment has a strong hook portion 1.
There are four projections 15 on the inner side of each of the left and right, two locations on each side, and each projection 15 has a semi-cylindrical or semi-cylindrical shape. Therefore, near the outer end of the projection 15, there is provided a support portion 16 parallel to the axial direction of the rods, and this support portion 16 is shown by a dashed line in FIG. 1B.

As shown by a chain line in FIG. 2 (a), the hooks 11 are arranged in advance so that the projections 15 are arranged at intervals smaller than the outer diameter of the clothespin 10 in order to obtain elasticity. It is formed in a shape narrowed inward. The protrusion 15 has an axial length as shown in FIG.
It can be set arbitrarily long and short like the long one shown in (c). A longer holding force can be obtained by making the support portion 16 longer.

Although the projections 15 of the first embodiment are all of the same shape and the same size at all four positions, it is possible to change the size, and an example thereof is shown in FIG. 3 as a second embodiment. . In the second embodiment, the lower projections on the inner rod insertion opening side of the four projections of the first embodiment are changed to large projections 15 '.
Other configurations are the same as those of the first embodiment. Protrusions 15, 15,
Since the positions of 15 ′ and 15 ′ are the same as in the first embodiment, the point of action of the projections 15, 15, 15, 15 of the first embodiment coincides with the axis C of the rod 10. Therefore, in the case of the second embodiment, the concentration point of the operation is slightly lower than the axis C. In the second embodiment, the width of the rod insertion port 14 is smaller than that of the first embodiment by the size of the protrusion 15 ′. However, since the projections 15 are provided at the ends of the parallel portions, the attachment and detachment are easy.

The projections 15 do not have to be symmetrically arranged, but those having an asymmetric arrangement are shown in FIG. In the third embodiment, a projection 15 of the same shape and size is used.
Are arranged inside the hook portion 11 at four equal intervals, the width of the rod insertion opening 14 ′ is the narrowest, and is set near the limit of elastic deformation. Therefore, it is desirable to use a material having elastic strength and flexibility that does not cause the opening and closing stress to concentrate on the hook apex and cause breakage.

Referring to the fourth embodiment, which is composed of three projections 15 as the minimum limit, in this example, the rod insertion port 14 is used.
And two protruding portions 15 at the left and right. The projections 15 are arranged at intervals of 120 degrees, and are the hooks 11 having a shape narrowed inward as in the case of the first embodiment. The following is a dynamic analysis of those of Examples 1 to 4.

FIG. 6A shows a state in which the two projections 15 of the vertical line are most widened when the rods 10 are attached and detached in the first embodiment. At this time, the bending moment at the vertex (point 0) of the hook 11 is M = l ₂ · P ₂ (1). Further, assuming that the distance when forcibly widened from the no-load state between the rod insertion port side projections is λ ₂ , the y-direction force (acting on the projections) P ₂ is given by Given in 2).

[0015] _{P 2 = 4E · I · λ} 2 / π · R 3 ... (2) where, E: elastic variables of the hook material, I: sectional secondary moment ^{(= πd 4/64 = π} × 8 4 / 64 = 4096π
/ 64 ≒ 200 mm ⁴ ), λ ₂ : spread amount between two projections, R: radius of curvature of the center line of hook 11 centering on O ′.

Next, when the rod shown in FIG. 6B is mounted, the distance between the diagonal projections is d ', and d is d.
'Since created as, the component of the force in the central direction of the rod force _{P 2 d-d'> d} ( outer diameter of the rod) is proportional to the value of.

In this case, a force for the hook 11 to tighten the rods is determined. In FIG. 6 (b), h _0: no load distance between the projections at b-b, h _1: distance after rod is widened between b-b by mounting, the outer diameter of the rod is d = .phi.30 mm When,
The line inclined α = 30 ° from the y-axis and the yy ′ axis are bb
The distance h ₀ between the projections intersecting with d is d × sin 60 ′ = 26 m
m. In this case, the bending moment acting on the point O is as follows: M = l ₁ · P ₁ + l ₂ · P ₂ (3) where P ₁ = 4π · I (h ₁ -h ₀ ) / π · R ³ ... ( 4) P ₂ = 4π · I (h ₂ −h ₀ ) / π · R ³ (〃) From equation (4), if the diameter and curvature of the hook are constant, the force P ₁ for tightening the rod and P ₂ is (h ₁ -h
₀ ) and (h ₂ −h ₀ ).

When the hook portion of the second embodiment is mounted on a rod, the result is as shown in FIG. 7, and the same analysis as in the first embodiment is established. The bending moment acting on the point O is M = l ₁ · P ₁ + l ₂ · P ₂ (5) where P ₁ = 4π · I · (h ₁ -h ₀ ) / π · R ³ (6) P ₂ = 4π · I · (h ₂ −h ₀ ) / π · R ³ (〃) Here, assuming that the diameter and curvature of the hook are constant from Equation (6), the forces P ₁ and P for tightening the rods are given. ₂ is (h ₁
−h ₀ ) and (h ₂ −h ′ ₀ ). When attaching and detaching the rods, the outer diameter φd of the rods should be bb up to (d-
h ′ ₀ ). At this time, the bending moment at the point O becomes the maximum, and the bending effect of the XX section at the point O also becomes the maximum. The maximum bending moment M (ma
x) is M (max) = l ₂ · P ₂ ′ (7) P ₂ ′ in equation (7) is P ₂ ′ = 4π · I (d−h ′ ₀ ) / π · R ³ (8) Becomes Next, the bending stress of the XX section at the point O is as follows.

M = σ · Z (9) In the equation (9), M = l ₂ · P ₂ ′, σ: bending stress, Z: first moment of area (Z ₀ =
(Π / 32) d ³ = π / 32 × 30 ³ = 2650 (mm
³ ). Therefore, σ = M / Z = l ₂ · P ₂ '/ Z ₀ = l ₂ × 4π · I (dh ′ ₀ ) / π · R ³ / Z ₀ (10) Since everything except (dh ′ ₀ ) is constant, if the value of (dh ′ ₀ ) becomes too large, σ may exceed the yield point strength of the hook material.

In addition, in the attachment and detachment, the "distance" between the surface of the rod and the projection b is about 1/8 of the circumference of the rod (L = π · d). When φd = 30 mm, L = 94.2 mm, and when ８, it is approximately 12 mm. At this time, P ₂ −
Work that has been multiplied by the half of the power and L of P ₁ is required. Letting this be W, W = 1/2 (P ₂ −P ₁ ) · L (11) This work is clearly greater than when the four projections have equal radii, and therefore, the work for attaching and detaching the rod is Although extra power is required, once mounted, there is an advantage that the laundry is not easily blown off by external force such as wind.

In the case of FIG. 4, the interval between the bb projections in the X-X direction is only about the radius of the rod (geometrically this is the case), and is extended to the diameter d of the rods. The bending stress at the apex of the hook becomes extremely large, and the possibility of breakage during mounting increases.

The mechanical analysis in the case of three projections in FIG. 5 is based on the first embodiment and FIG. As can be seen from equation (3), in the case of FIG. 1, M = l ₁ · P ₁ + l ₂ · P ₂ , but in FIG. 5, since only M = l ₁ · P ₂ , the radius of the projection is the same. If so, the tightening force on the rods will be slightly weaker. To compensate for this, the radius of the b projection must be increased as shown in FIG.

[0023]

Since the present invention is constructed and operates as described above, the projections are tightened in line contact with the outer peripheral surface of the rods, so that the clamping force of the hook works very effectively, and This has the effect of exerting a large fixing force.

[Brief description of the drawings]

FIG. 1 (a) Example 1 of a hook for hanging a pole according to the present invention
FIG. (B) An enlarged perspective view of a projection.

FIG. 2A is an explanatory view of the first embodiment mounted on a rod or the like. (B) A front view showing an example of a projection. (C) Front view showing another example of the projection.

FIG. 3 is an explanatory diagram relating to a second embodiment.

FIG. 4 is an explanatory diagram relating to a third embodiment.

FIG. 5 is an explanatory diagram relating to a fourth embodiment.

FIG. 6 (a) is an explanatory diagram for a mechanical analysis relating to rod mounting according to the first embodiment. (B) Explanatory drawing about the mechanical analysis after rod mounting | wearing of Example 1. FIG.

FIG. 7 (a) is an explanatory diagram relating to a mechanical analysis after the rod is mounted in the second embodiment. (B) Explanatory drawing about the mechanical analysis regarding rod mounting | wearing of Example 2. FIG.

Claims (3)

[Claims] 1. A hook for hanging on a rod, the hook having a shape extending upward from below the rod, turning upward and substantially surrounding the rod again, and an outer periphery of the rod. At least three projections provided inside the hook portion so as to be held in contact with the surface, and the projections are parallel to the axial direction of the rods capable of linearly contacting the outer peripheral surface of the rods. A hook for pole hanging having a support portion. 2. A projection is provided at each of two locations on the left and right sides of the hook so as to sandwich the rods from the left and right. A pair of projections is provided on the left and right sides of the rod insertion opening for inserting the rods into the hooks. 2. The hook according to claim 1, wherein the projections are juxtaposed, and the projections are pushed out to insert the rods. 3. The at least three projections have different sizes, and the size of the rod insertion opening for inserting the rods into the hooks is narrowed or widened according to the size of the projections.
Or the hook for pole hanging according to 2.