JP2709443B2 - Western umbrella - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a western umbrella, and more particularly to an improved umbrella.

[0002]

2. Description of the Related Art Conventionally, long umbrellas and folding umbrellas have been known in which a rib is formed of a rod having a resilient force and having a substantially circular cross section.

[0003] Since such a bar is a long product formed by extruding a resin, for example, it is easy to easily cut a desired bone simply by cutting it to a predetermined length and fixing a bracket to a necessary portion. There are advantages that can be provided.

[0004]

In both the long umbrella and the folding umbrella, the rib is pivotally connected to the receiving bone.
When the umbrella is opened, it receives an upward pushing force from the receiving bone. At this time, the free end of the rib is bent downward by the tension of the stretched umbrella cloth.

[0005] The ribs formed by the above-mentioned rods are:
A rigid bracket is fixed at a predetermined position, and the tip of the receiving bone is pivotally connected thereto. Therefore, a cantilever-shaped bendable portion from the end face to the tip of the bracket is formed on the rib,
When the umbrella is opened, the bendable portion is greatly curved.

For this reason, when the bending portion is bent and deformed, stress concentration occurs near the end face of the bracket, and there is a possibility that the portion may be easily broken.

In addition, the longer the bendable portion becomes, the more easily it bends and deforms.
The bendable portion swings up and down with the vicinity of the bracket as a fulcrum, and may be easily broken there.

[0008] The applicant has conventionally provided a umbrella using a rib made of a resin rod reinforced with glass fiber. However, in order to reduce the weight, an umbrella made of a resin rod reinforced with carbon fiber has been provided. Tried to provide a western umbrella, and found that the rib could easily break at the end face of the bracket. Generally, carbon fiber reinforced resin is
Although it is considered to be superior in elasticity and toughness to glass fiber reinforced resin, on the other hand, breakage when the elastic limit is exceeded is sudden, especially when a thin rib is formed, the total length of the bendable part is This is considered to be due to the fact that it is easy to bend over a large area, and the distortion between the bracket and the rigid bracket becomes remarkable.

[0009]

SUMMARY OF THE INVENTION The present invention provides a rib of a western umbrella which has solved the above-mentioned problems. As a first means, a substantially circular cross section formed of carbon fiber reinforced resin is provided. A umbrella provided with a umbrella structure including a rib and a rib fixed to the rib and fixed to the rib, wherein the rib can be freely bent from the end face to the tip of the bracket. The bendable portion is a tapered first flexible portion that extends a predetermined distance L1 in the distal direction from the end surface of the bracket, and the remaining portion is gradually directed toward the distal end. The point is that it is formed in a tapered shape to reduce the outer diameter.

[0010] Further, the present invention is constituted as a second means, comprising: a rib having a resilient force represented by a spring constant and comprising a flexible rod having a substantially circular cross section; In a umbrella provided with a umbrella structure including a receiving bone pivotally connected to a rigid bracket device, the ribs constitute a bendable portion extending from an end surface to a tip of the bracket device,
The bendable portion includes a first flexible portion extending a predetermined distance L1 in a distal direction from an end surface of the bracket, and a second flexible portion extending a predetermined distance L2 in a distal direction following the first flexible portion. ,
Following the second flexible portion, a third flexible portion extending a predetermined distance L3 to the tip is formed, and a spring constant K of the first flexible portion is formed.
1, the spring constant K2 of the second flexible part, and the spring constant K3 of the third flexible part are set to K3 <K2 <K1, and the predetermined distance L1 of the first flexible part Predetermined distance L of flexure
2 and the predetermined distance L3 of the third flexible portion is defined as L1 <L2 <L3
The point is that it is constituted.

Further, the present invention is configured as a third means, which comprises a rib having a resilient and flexible rod having a substantially circular cross section, and a rigid bracket fixed to the rib. An umbrella having a umbrella structure including a receiving bone pivotally connected to the bracket, wherein the rib constitutes a bendable portion extending from an end face to an end of the bracket tool, and the bendable section is formed by an end face of the bracket tool. A first flexible portion having no taper extending a predetermined distance L1 in the distal direction from the first flexible portion, and a second flexible portion having a tapered portion which extends the predetermined distance L2 in the distal direction following the first flexible portion and gradually reduces the outer diameter. And a tapered third flexible portion that extends a predetermined distance L3 to the tip following the second flexible portion and gradually reduces the outer diameter, and includes a predetermined distance L1 of the first flexible portion, The predetermined distance L2 of the second flexible part and the predetermined distance L3 of the third flexible part Together constituting the 1 <L2 <L3,
The taper angle T2 with respect to the axis of the second flexible portion and the taper angle T3 with respect to the axis of the third flexible portion are configured such that T3 <T2.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) A first embodiment shown in FIGS. 1 and 2 shows a long umbrella. An upper wheel 2 is fixed to an upper end of a center rod 1, and a lower portion of the upper wheel is provided below the upper wheel. A slidable lower wheel 3 is extrapolated to the center rod. The base end of the rib 4 is pivotally connected to the upper wheel 2, the base end of the receiving bone 5 is pivotally connected to the lower wheel 3, and the tip of the receiving bone 5 is pivotally connected to a longitudinal halfway of the rib 4. . Such a configuration is conventionally known as a frame structure of a long umbrella, and although not shown, an umbrella cloth is stretched over the rib 4. Although the illustrated embodiment shows a long umbrella that is manually opened and closed, a known jump-type automatic umbrella that divides the lower wheel 3 into upper and lower portions and has a spring interposed may be used.

The rib 4 is made of a flexible rod having a resilient force and having a substantially circular cross section, and a sheet metal pivoting tool 8 is fixed to the base end thereof by caulking or the like. And a metal plate bracket 9 is fixed to the middle part in the longitudinal direction by caulking or the like, and the tip of the receiving bone 5 is pivotally connected to the bracket 9. The pivotal attachment 8 and / or the bracket 9 may be made of sheet metal, or may be formed into a block shape with a synthetic resin and adhered to the outer peripheral surface of the rib with an adhesive. And is supported by the receiving bone 15 from below when the umbrella is opened.

The rod material forming the ribs 4 is formed by extruding a reinforced resin such as a glass fiber reinforced resin, a carbon fiber reinforced resin, and a graphite fiber reinforced resin. The effect of the present invention is best exhibited. Is an extruded material of carbon fiber reinforced resin.

The rib 4 includes a pivotal attachment 8 and a bracket 9
, And a cantileverable flexible portion 4b extending from the end face to the tip of the bracket 9.
As shown in FIG. 2, the bendable portion 4b includes a first flexible portion 41 extending a predetermined distance L1 in the distal direction from the end surface of the bracket 9 and a predetermined flexible portion in the distal direction following the first flexible portion. A second flexible portion 42 extending a distance L2 and a third flexible portion 43 following the second flexible portion and extending a predetermined distance L3 to the tip are formed, and their respective length dimensions are L1 <L2 <. L3.

The first flexible portion 41 does not have a taper and has the same outer diameter, but the second flexible portion 42 gradually decreases its outer diameter toward the third flexible portion 43. The third flexible portion 43 also has a taper that gradually reduces the outer diameter toward the distal end. The outer diameter of the first flexible portion 41 having no taper is the same as the outer diameter of the bridging portion 4a. Therefore, the rib 4 is formed by the bridging portion 4a and the first flexible portion 4a.
1 is formed to have the same diameter without taper. Such a tapered rib 4 is obtained by cutting the outer periphery of an extruded rod made of fiber reinforced resin.

The taper is the second flexible portion 42
And the taper of the second flexible part 42 is steeper than the taper of the third flexible part 43. 42
And the third flexible portion 43
, The taper angle T3 with respect to the axis is set to T3 <T2.

For this reason, the elastic force of the rib 4 is determined by the spring constant K =
When expressed according to W / δ (Wkg = load, δmm = bending), the spring constant K1 of the first flexible portion 41, the spring constant K2 of the second flexible portion 42, and the spring constant K2 of the third flexible portion 43 When the spring constant K3 is K
3 <K2 <K1.

An example of the ribs 4 made of a carbon fiber reinforced resin extruded rod is shown in Table 1 (dimension units are mm
Is).

[Table 1]

The result based on the above configuration is shown by the chain line in FIG. A dashed line X indicates the state of bending of the conventional rib, in which the entire rib including both the bridge portion 4a and the bendable portion 4b has the same diameter without taper, and has a uniform spring constant over the entire length. In the case of this prior art, the bendable portion 4b bends the entirety uniformly and largely at the time of opening the umbrella, and the concentration of the strain stress occurs remarkably at the end face portion of the bracket 9.

On the other hand, the chain line Y indicates the bent state of the rib according to the embodiment of the present invention. According to this,
The bendable portion 4b is curved so as to gradually increase its bending toward the tip. In other words, the first flexible portion 41 hardly bends in response to the flexible bending of the third flexible portion 43, and does not generate strain stress toward the end face of the bracket 9. The second flexible part 42 slightly bends between the first flexible part 41 and the third flexible part 43, and buffers or absorbs elastic deformation between the two parts 41 and 43.

(Second Embodiment) A second embodiment shown in FIGS. 3 and 4 shows a folding umbrella. An upper wheel 12 is fixed to an upper end of a center rod 11, and a lower portion of the upper wheel is provided below the upper wheel. , The lower wheel 13 slidably attached to the center rod is extrapolated. Rib 14
The distal end of the connecting bone 16 and the distal end of the receiving bone 15 are vertically pivoted independently of each other at the base end of the receiving bone 15.
It is pivoted to 3. The distal end of a support bone 17 whose base end is pivotally connected to the upper wheel 12 is pivotally connected to a longitudinally intermediate portion of the receiving bone 15,
A proximal end of a connecting bone 16 is pivotally connected near the distal end of the supporting bone 17. Such a configuration is conventionally known as a frame structure of a topless folding umbrella, and an umbrella cloth is stretched on the ribs 14 (not shown). Various types of folding umbrellas may be used in addition to the topless type as in the illustrated embodiment.

The ribs 14 are made of a flexible rod having a resilient force and having a substantially circular cross section. A bracket 19 made of sheet metal is fixed to the base end of the rib 14 by caulking or the like. The tip of the connecting bone 16 is pivotally attached to the tongue piece 9a, and the tip of the receiving bone 15 is pivotally attached to the bracket piece 9b. The bracket 19 may be made of sheet metal or formed in a block shape with a synthetic resin and adhered to the outer peripheral surface of the rib with an adhesive, but in any case, the bracket 19 is not bent along the rib 14. It has rigidity and is supported by the receiving bone 15 from below when the umbrella is opened.

The rod material forming the ribs 14 is formed by extruding a reinforced resin such as a glass fiber reinforced resin, a carbon fiber reinforced resin, and a graphite fiber reinforced resin. The effect of the present invention is best exhibited. Is an extruded material of carbon fiber reinforced resin.

The ribs 14 are the first ribs constituting the long umbrella.
A rigid portion 14a held by a bracket 19 and a cantilevered flexible portion 14 extending from the end face to the tip of the bracket 19 without having a bridge portion as in the embodiment.
b. The structure of the bendable portion 14b is the same as that of the first embodiment, but will be repeatedly described based on the same reference numerals just in case.

That is, as shown in FIG. 4, the bendable portion 14b includes a first flexible portion 41 extending a predetermined distance L1 from the end surface of the bracket 19 in the distal direction, and a distal portion following the first flexible portion. A second flexible portion 42 extending a predetermined distance L2 in the direction, and a third flexible portion 43 extending a predetermined distance L3 to the tip following the second flexible portion, each having a length dimension of L1
<L2 <L3.

The first flexible portion 41 does not have a taper and has the same outer diameter, but the second flexible portion 42 gradually decreases its outer diameter toward the third flexible portion 43. The third flexible portion 43 also has a taper that gradually reduces the outer diameter toward the distal end. The outer diameter of the first flexible portion 41 having no taper is the same as the outer diameter of the rigid portion 14a. Therefore, the rib 4 tapers a region extending over both the rigid portion 14a and the first flexible portion 41. Without the same diameter. Such a tapered rib 14 can be obtained by cutting the outer periphery of an extruded rod made of fiber reinforced resin.

Incidentally, the taper is the second flexible portion 42
And the taper of the second flexible part 42 is steeper than the taper of the third flexible part 43. 42
And the third flexible portion 43
, The taper angle T3 with respect to the axis is set to T3 <T2.

Therefore, the resilience of the ribs 14 is calculated as the spring constant K =
When expressed according to W / δ (Wkg = load, δmm = bending), the spring constant K1 of the first flexible portion 41, the spring constant K2 of the second flexible portion 42, and the spring constant K2 of the third flexible portion 43 When the spring constant K3 is K
3 <K2 <K1.

Table 2 shows examples of the ribs 14 made of an extruded rod made of carbon fiber reinforced resin.
mm).

[Table 2]

The result based on the above configuration is shown by the chain line in FIG. A dashed line X indicates a rigid portion 14a and a bendable portion 14b.
The entire rib, including both, has the same diameter without taper,
This figure shows a state in which a conventional rib has a uniform spring constant over the entire length. In the case of this prior art, the bendable portion 14b bends the entirety uniformly and largely at the time of opening the umbrella, and the stress concentration at the end face portion of the bracket 19 significantly occurs.

On the other hand, a chain line Y indicates a bent state of the rib according to the embodiment of the present invention. According to this,
The bendable portion 14b is curved so as to gradually increase its bending toward the tip. In other words, the first flexible portion 41 hardly bends in response to the flexible bending of the third flexible portion 43, and does not generate a strain stress toward the end face of the bracket 19. The second flexible part 42 slightly bends between the first flexible part 41 and the third flexible part 43, and buffers or absorbs elastic deformation between the two parts 41 and 43.

(Fourth Embodiment) In both the first embodiment and the second embodiment, the bendable portion of the rib is provided with the first flexible portion 41,
The three flexible portions 42 and 43 are used to prevent the rib from breaking. The flexible portion has a taper extending a predetermined distance L1 from the end surface of the bracket to the distal end. This can also be achieved by leaving the first flexible portion 41 not to be formed, and forming the remaining portion in a tapered shape gradually reducing the outer diameter toward the tip. That is, in this case, the region extending from the first flexible portion 41 to the tip (the region corresponding to both the second flexible portion 42 and the third flexible portion 43) has a taper uniformly inclined throughout. Having. For example, the outer diameter of the portion adjacent to the first flexible portion 41 is 3.0 mm, the outer diameter of the distal end portion is 2.5 mm, and the outer peripheral surface is evenly inclined between them. If it is, the fracture rate of the rib can be reduced.

[0035]

As described above, since the conventional rib using the extruded rod has the same outer diameter over the entire length, the cantilevered flexible portion is uniformly formed when the umbrella is opened. In contrast to the problem that the bending stress is concentrated at the end face portion of the bracket and greatly broken, the bending is easily broken. On the other hand, according to the present invention, the bending gradually increases as the bendable portion reaches the tip. In this case, the first flexible portion 41 hardly bends in response to the flexible bending of the third flexible portion 43 and generates no strain stress toward the end face of the bracket. There is no fear of causing such a breakage accident.

This effect is prominent when the ribs are formed from an extruded rod made of a carbon fiber reinforced resin. Although it is desired to provide ribs made of a carbon fiber reinforced resin for weight reduction, It is possible to overcome the conventional technology including the problem of breakage.

Further, according to the present invention, when the bendable portion bends when the umbrella is opened, the second flexible portion 42 slightly bends between the first flexible portion 41 and the third flexible portion 43, Both 4
Since the elastic deformation between the portions 1 and 43 is buffered or absorbed, the deformation over the entire bendable portion is smooth and continuous, and there is an effect that fatigue of the ribs is prevented and the durability is excellent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention in a closed state.

FIG. 2 is an enlarged view of a rib in the embodiment.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the present invention in a closed state.

FIG. 4 is an enlarged view of a rib in the embodiment.

[Explanation of symbols]

 Reference Signs List 4 main rib 4b bendable part 5 bone receiving part 9 bracket fixture 14 ribs 14b bendable part 15 bone reception 19 bracket fixture 41 first flexible part 42 second flexible part 43 third flexible part

Claims (3)

(57) [Claims] 1. A umbrella structure including a rib made of a carbon fiber reinforced resin and made of a rod having a substantially circular cross section, and a receiving bone pivotally connected to a rigid bracket fixed to the rib. In the western umbrella, the rib comprises a bendable portion extending from the end surface of the bracket to the tip, and the bendable portion does not have a taper extending a predetermined distance L1 in the tip direction from the end surface of the bracket. An umbrella characterized by being formed in a tapered shape in which the outer diameter is gradually reduced with the remaining portion being directed toward the tip, leaving the flexible portion. 2. A rib having a resilient force represented by a spring constant and comprising a flexible rod having a substantially circular cross section and a receiving bone pivotally connected to a rigid bracket fixed to the rib. The umbrella provided with a umbrella structure including: a rib, which constitutes a bendable portion extending from the end surface of the bracket to the tip, and wherein the bendable portion has a predetermined distance L1 in the tip direction from the end surface of the bracket. , A second flexible portion extending a predetermined distance L2 in the distal direction following the first flexible portion, and a second flexible portion extending a predetermined distance L3 to the distal end following the second flexible portion. A spring constant K1 of the first flexible portion, a spring constant K2 of the second flexible portion, and a spring constant K3 of the third flexible portion, wherein K3 <K2 <
K1 and a predetermined distance L1 of the first flexible part, a predetermined distance L2 of the second flexible part, and a predetermined distance L3 of the third flexible part are defined as L1 <L2 <
An umbrella characterized by being constructed in L3. 3. A umbrella bone structure including a rib having a resilient, flexible, substantially circular cross-section bar and a receiving bone pivotally connected to a rigid bracket fixed to the rib. In the umbrella provided with, the ribs constitute a bendable portion extending from the end face of the bracket to the tip, and the bendable portion does not have a taper extending a predetermined distance L1 in the tip direction from the end face of the bracket. A first flexible portion, a second flexible portion having a tapered shape that gradually extends the predetermined distance L2 in the distal direction following the first flexible portion, and gradually reduces the outer diameter; Predetermined distance L
3, a tapered third flexible portion configured to gradually reduce the outer diameter, and a predetermined distance L1 of the first flexible portion, a predetermined distance L2 of the second flexible portion, and a third flexible portion. Is determined as L1 <L2 <
An umbrella, wherein L3 and a taper angle T2 with respect to the axis of the second flexible portion and a taper angle T3 with respect to the axis of the third flexible portion are configured such that T3 <T2.