Umbrella

Abstract

To suppress fluttering of ribs against a wind pressure, in an umbrella.SOLUTION: An umbrella (1) comprises a shaft (21), a plurality of ribs (3), and a plurality of stretchers (4). The shaft (21) comprises an inside cap (22) and a runner (23). The ribs (3) are provided in a circumferential direction with respect to the inside cap (22) and each comprises: an inner rib (31) with its proximal end connected rotatably to the inside cap (22); and an outer rib (32) which is connected to the inner rib (31) so as to be foldable to the inside and outside of the umbrella (1) with respect to the inner rib (31), is given a restitutive force toward a reference position when the umbrella (1) is opened, is formed of thermoplastic resin containing a fiber filler to be tapered, and thereby is foldable and bendable with respect to the rib (3) against a wind pressure. The stretchers (4) are provided in a circumferential direction with respect to the runner (23), with each proximal end connected rotatably to the runner (23) and with each distal end connected to the distal end of the inner rib (31).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an umbrella. [Background technology]

[0002] Conventionally, there is an umbrella in which a coil spring is provided in the middle of the ribs extending radially from the upper roller, allowing the ribs to bend in a returnable manner in response to wind pressure, thereby deflecting the wind pressure (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-206505 A Summary of the Invention [Problem to be solved by the invention]

[0004] The umbrella in Patent Document 1 simply has a coil spring installed in the middle of the ribs of an existing umbrella, and is unable to flexibly deflect large amounts of wind pressure, meaning that the ribs are prone to flapping about in response to wind pressure. [Means for solving the problem]

[0005] The invention is, for example, as follows: In the following, the symbols of the drawings are used for reference. [1] Referring to FIG. 1, a center shaft (21) having an upper turntable (22) and a lower turntable (23); A plurality of ribs (3) are provided in the circumferential direction of the upper turntable (22), An inner rib (31) whose base end is rotatably connected to the upper turntable (22); a rib (3) including an outer rib (32) that is connected to the inner rib (31) so as to be able to bend inside and outside the umbrella (1), and that is given a restoring force to a reference position when the umbrella (1) is opened, and that is formed of a thermoplastic resin containing a fiber-based filler and has a tapered shape, so that the outer rib (32) can bend relative to the inner rib (31) and flex in response to wind pressure; A plurality of ribs (4) are provided around the lower turntable (23) in the circumferential direction, the base end of which is rotatably connected to the lower turntable (23) and the tip of which is rotatably connected to the tip of the inner rib (31); An umbrella (1). [2] In the umbrella (1) according to [1], An umbrella (1) in which the length of the outer rib (32) is 120% or more of the length of the inner rib (31). [3] Referring to FIG. 5, in the umbrella (1) described in [1], The outer rib (32) is solid and has a cross-sectional shape that is flattened inward and outward directions of the umbrella (1). [4] In the umbrella (1) according to [1], The inner rib (31) of the umbrella (1) is made of metal. [5] Referring to FIG. 6, in the umbrella (1) described in [1], An umbrella (1) in which, in the direction in which the ribs (3) extend, the distance (H) from the connection point (F) between the inner rib (31) and the support rib (4) to the connection center (S) between the inner rib (31) and the outer rib (32) is 1 / 30 or less of the length of the ribs (3). [6] Referring to FIG. 10, in the umbrella (1) according to any one of [1] to [3] and [5], The inner bone (31) is An inner bone body (310) whose base end is rotatably connected to the upper turntable (22); The umbrella (1) comprises a fulcrum joint (53) made of resin, fixed to the inner rib body (310), and to which the outer rib (32) and the support rib (4) are rotatably connected. [7] Referring to FIG. 11, in the umbrella (1) described in [6], The outer bone (32) includes a shaft portion (321) extending on both sides in a first direction perpendicular to the axial direction of the center shaft (21), The umbrella (1) is formed with a pair of arms (311) at the tip of the fulcrum joint (53) having bearing portions (312, 312A) that rotatably receive the shaft portion (321), and hinge springs (521, 522) that press the outer surface of the base end portion of the exoskeleton (32) when the exoskeleton (32) rotates, and impart a restoring force to the exoskeleton (32) to a reference position. [8] Referring to FIG. 11, in the umbrella (1) described in [6], The outer bone (32) includes a shaft portion (321) extending on both sides in a first direction perpendicular to the axial direction of the center shaft (21), The fulcrum joint (53) is formed with a pair of arms (311) having bearings (312, 312A) for rotatably receiving the shaft portion (321), At least one of the shaft portions (321) passes through the bearing portion (312, 312A) and extends to the outside of the arm portion (311), An umbrella (1) comprising a coil portion (511) fitted onto the shaft portion (321), a first arm portion (512) extending from the coil portion (511) and connecting to the inner rib (31), and a second arm portion (513) extending from the coil portion (511) and connecting to the outer rib (32), and comprising a torsion coil spring (51) that imparts a restoring force to the outer rib (32) to return it to a reference position. [9] Referring to FIG. 7, in the umbrella (1) according to any one of [1] to [5], The outer bone (32) includes a shaft portion (321) extending on both sides in a first direction perpendicular to the axial direction of the center shaft (21), A pair of arms (311) having bearings (312, 312A) for rotatably receiving the shaft (321) are formed at the tip of the inner bone (31), At least one of the shaft portions (321) passes through the bearing portion (312, 312A) and extends to the outside of the arm portion (311), An umbrella (1) comprising a coil portion (511) fitted onto the shaft portion (321), a first arm portion (512) extending from the coil portion (511) and connecting to the inner rib (31), and a second arm portion (513) extending from the coil portion (511) and connecting to the outer rib (32), and comprising a torsion coil spring (51) that imparts a restoring force to the outer rib (32) to return it to a reference position.

[10] Referring to FIG. 12, in the umbrella (1) according to any one of [1] to [5], a wave-shaped bar spring (54) that connects the outer rib (32) to the inner rib (31) in a state separated from the inner rib (31) and applies the restoring force to the outer rib (32); The corrugated rod spring (54) has a first end connected to the inner rib (31) and a second end connected to the outer rib (32), and a corrugated portion (521) is formed in the center of the umbrella (1) to impart a restoring force to the second end side in response to deformation of the second end side.

[11] Referring to FIG. 13, in the umbrella (1) according to any one of [1] to [5], The umbrella (1) is provided with a coil spring (56) that connects the main rib (3) to the inner rib (31) at a first end inserted into the inside of the inner rib (31) from the tip surface of the inner rib (31) and at a second end connected to the outer rib (32), and that connects the outer rib (32) to the inner rib (31) at a position separated from the inner rib (31), and that applies a restoring force to the outer rib (32) to a reference position.

[12] Referring to FIG. 10, an outer rib (32) constituting the tip side of a rib (3) is connected to an inner rib (31) constituting the base side of the rib (3) so as to be bendable toward the inside and outside of the umbrella (1), and a restoring force to a reference position is applied when the umbrella (1) is opened, and a tip of a support rib (4) is connected to a tip of the inner rib (31). A fulcrum joint (53) used for the umbrella (1), The inner rib (31) includes an inner rib body (310) whose base end is rotatably connected to the center shaft (21) of the umbrella (1), and the fulcrum joint (53), The fulcrum joint (53) is made of resin and is fixed to the tip of the inner bone body (310). The outer bone (32) and the support bone (4) are rotatably connected to the fulcrum joint (53).

[13] Referring to FIG. 11, in the fulcrum joint (53) described in

[12] , The outer bone (32) includes a shaft portion (321) extending on both sides in a first direction perpendicular to the axial direction of the center shaft (21), The fulcrum joint (53) is formed with a pair of arms (311) having bearing portions (312, 312A) that rotatably receive the shaft portion (321), and hinge springs (521, 522) that press the outer surface of the base end portion of the exosteal bone (32) when the exosteal bone (32) rotates, and impart a restoring force to the exosteal bone (32) to a reference position.

[14] Referring to FIG. 11, in the fulcrum joint (53) described in

[12] , The outer bone (32) includes a shaft portion (321) extending on both sides in a first direction perpendicular to the axial direction of the center shaft (21), The fulcrum joint (53) is formed with a pair of arms (311) having bearings (312, 312A) for rotatably receiving the shaft portion (321), At least one of the shaft portions (321) passes through the bearing portion (312, 312A) and extends to the outside of the arm portion (311), The coil portion (511) of the torsion coil spring (51) is fitted onto the shaft portion (321), a first arm portion (512) extending from the coil portion (511) of the torsion coil spring (51) is connected to the fulcrum joint (53), and a second arm portion (513) extending from the coil portion (511) of the torsion coil spring (51) is connected to the exoskeleton (32), thereby applying a restoring force to the exoskeleton (32) to a reference position. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram of an umbrella. [Diagram 2] This is a perspective view of the umbrella from below. [Diagram 3] An enlarged view to explain the structure of the dowel. [Figure 4] FIG. 13 is a diagram for explaining the variable state of the exoskeleton from calm to strong wind. [Diagram 5] Fig. 5(A) is a perspective view showing an exoskeleton having a circular cross section, and Fig. 5(B) is a perspective view showing an exoskeleton having a flattened circular cross section. [Figure 6] Fig. 6(A) is a diagram for explaining the connection center, connection points, and support structure. Fig. 6(B) is a diagram showing a method for connecting the inner bone and the outer bone using a shaft. Fig. 6(C) is a diagram showing a method for connecting the inner bone and the outer bone using an elastic member. [Figure 7] Fig. 7(A) is a side view showing a combination of contact connection and a torsion coil spring in a connection mechanism between an inner bone and an outer bone, and Fig. 7(B) is a cross-sectional view showing the connection mechanism. [Figure 8]Fig. 8(A) is a side view showing a connection mechanism in which a part of the hole in the connection mechanism in Fig. 7 serves as an open receiving portion, and Fig. 8(B) is a cross-sectional view showing the connection mechanism. [Figure 9] Fig. 9(A) is a side view showing a connection mechanism in which a hinge spring is added to the connection mechanism of Fig. 7. Fig. 9(B) is a cross-sectional view showing the connection mechanism. [Figure 10] Fig. 10(A) is a side view showing a connection mechanism in which the tip of the inner bone in the connection mechanism in Fig. 7 serves as a fulcrum joint, and Fig. 10(B) is a cross-sectional view showing the connection mechanism. [Figure 11] Fig. 11(A) is a side view showing a connection mechanism in which the tip of the inner bone in the connection mechanism in Fig. 9 serves as a fulcrum joint, and Fig. 11(B) is a cross-sectional view showing the connection mechanism. [Figure 12] Fig. 12(A) is a side view showing a connection mechanism combining a non-contact connection and a wave rod spring, and Fig. 12(B) is a cross-sectional view showing the connection mechanism. [Figure 13] Fig. 13(A) is a side view showing a connection mechanism that combines a non-contact connection with a cylindrical coil spring, and Fig. 13(B) is a cross-sectional view showing the connection mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] (1. Basic structure of umbrella 1) Fig. 1 is a schematic diagram of an umbrella 1. In this specification, the top and bottom of Fig. 1 will be referred to as the top and bottom. The umbrella 1 has a center shaft 2, ribs 3, and support ribs 4. The center shaft 2 has a center shaft body 21, an upper wheel 22 and a lower wheel 23, and is provided at its lower end with a handle 24 for the user to grip.

[0008] The shaft body 21 is elongated and cylindrical. The upper wheel 22 is fixed to the upper part of the center shaft body 21. When the umbrella 1 is closed, the lower roller 23 is held by the lower stopper 26 at the bottom of the shaft body 21. When opening the umbrella 1, the lower stopper 26 is released, and the lower roller 23 becomes movable on the shaft body 21. The user then slides the lower roller 23 upward to a position held by the upper stopper 25, which is located on the shaft body 21 above the lower stopper 26 and below the upper roller 22. Alternatively, the lower roller 23 slides upward due to an upward biasing force of a biasing member until it abuts against the rivet 231 (to a position held by the upper stopper 25). Then, the lower roller 23 is held in that position by the upper stopper 25, and the umbrella 1 is in an open state (wide open state) as shown in FIG. 1. When closing umbrella 1, the user releases upper lever 25 and slides lower roller 23 downward to the position held by lower lever 26, and lower lever 23 is held in that position by lower lever 26, thereby closing umbrella 1.

[0009] A plurality of ribs 3 are provided in the circumferential direction of the upper wheel 22 (see FIG. 2), and the number is appropriate, for example, eight. The tip side of the ribs 3 bends at least inward and outward of the umbrella 1, allowing wind pressure on the umbrella 1 to escape. A sheet 7 (FIG. 2) is stretched between these ribs 3. By allowing the outer ribs 32 to bend up and down relative to the inner ribs 31 and to return to their original position, wind pressure acting on the umbrella 1 can be escaped. It also prevents the outer ribs 32 from bending upwards, causing the umbrella 1 to become what is known as an ochoko.

[0010] The sheet 7 has elasticity that allows it to follow the deformation of each rib 3, and preferably has elasticity of 20% or more. The center of the sheet 7 is passed through the stud 211, which is the upper end of the center shaft body 21, and is connected by sewing, adhesive, or the like to the stud 211, multiple points in the direction in which each rib 3 extends, and the tip 33 fitted to the tip of the rib 3. When the umbrella 1 is opened, the ribs 3 curve so as to convex outward (Fig. 4), and the inclination angle θ (Fig. 4(A)) from the horizontal plane is, for example, 10°.

[0011] The rib 3 includes an inner rib 31 and an outer rib 32 . The base end of the inner rib 31 is rotatably connected to the upper wheel 22, and can rotate inward and outward of the umbrella 1 with respect to the central shaft 2. It is preferable that the inner rib 31 is hard to bend and strong enough not to break. The material of the inner rib 31 may be, for example, a metal such as iron, stainless steel, or aluminum alloy, or a resin such as a thermoplastic resin containing a fiber-based filler. By increasing the rigidity or mechanical strength of the inner rib 31, the base end of the outer rib 32 can be firmly supported, the angle of the outer rib 32 can be smoothly changed, and the flapping of the umbrella 1 when it is subjected to wind pressure can be suppressed. For example, the inner rib 31 is press-formed from an aluminum alloy and has a U-shaped cross-sectional shape to reduce weight. In addition, the inner rib 31 has a substantially uniform cross-sectional shape along its length.

[0012] The outer ribs 32 are connected to the inner ribs 31 so as to be able to bend on the inside and outside of the umbrella 1, and are given a restoring force to the standard position when the umbrella 1 is opened.

[0013] A plurality of ribs 4 are provided for each rib 3 in the circumferential direction of the lower turntable 23. The base end of the rib 4 is rotatably connected to the lower turntable 23, and can rotate inward and outward of the umbrella 1 relative to the center shaft 2. The tip of the rib 4 is inserted between a pair of arms 611 (Fig. 3) of a dowel 61, and a shaft 612 (Fig. 3) rotatably held by the arms 611 is passed through. By this means, the tip of the rib 4 is rotatably connected to the tip of the inner rib 31.

[0014] Like the inner rib 31 , the ribs 4 also preferably have high rigidity or mechanical strength, and the material and cross-sectional shape thereof may be the same as those of the inner rib 31 .

[0015] (2. Function and design of inner bone 31 and outer bone 32) In Patent Document 1, a single rib is divided in the middle and connected with a coil spring, and there is no concept of differentiating the function and design of the inner and outer ribs. In this embodiment, the inner ribs 31 and the outer ribs 32 have completely different functions and designs in order to suppress flapping of the ribs 3 due to wind pressure. Specifically, in this embodiment, the outer ribs 32 are made of resin and have a tapered shape.

[0016] Fig. 4(A) shows the state of the outer ribs 32 when there is no wind, Fig. 4(B) when there is weak wind, Fig. 4(C) when there is a slightly strong wind, and Fig. 4(D) when there is a strong wind. In Figs. 4(A) to (D), the state of the outer ribs 32 when there is no wind is shown by solid lines, and the state of deformation due to wind is shown by dashed dotted lines. The lower side of the center axis 2 is not shown in Figs. 4(A) to (D). In this embodiment, the outer ribs 32 are bendable relative to the inner ribs 31, allowing them to be significantly deformed relative to the inner ribs 31. At the same time, the outer ribs 32 are made of resin and have a tapered shape, giving them flexibility and allowing them to bend. These factors work in harmony, allowing the outer ribs 32 to bend significantly in response to wind pressure and to bend flexibly and variably. As a result, the umbrella 1 of this embodiment can release a large amount of wind pressure and prevent the umbrella 1 from flapping when wind pressure occurs, allowing the user to use the umbrella 1 easily and safely.

[0017] (3. Configuration of the exoskeleton 32 with regard to its flexibility) (3-1. Material of outer bone 32) In order to ensure that the outer ribs 32 have a sufficient function of bending significantly in response to wind pressure and then returning to their original shape, the outer ribs 32 are formed from a thermoplastic resin containing a fibrous filler. The thermoplastic resin may be polycarbonate. The fibrous filler may be glass fiber, carbon fiber, cellulose fiber, or the like. By forming the outer ribs 32 from a resin composition containing a fibrous filler, it is possible to impart high levels of rigidity (particularly bending elasticity), creep characteristics, recovery from bending, and durability to the outer ribs 32, and also to improve the moldability of the outer ribs 32.

[0018] (3-2. Design of the external bone 32) (3-2-1. Shape of the outer bone 32) FIG. 5(A) shows an exoskeleton 32 having a circular cross section, and FIG. 5(B) shows an exoskeleton 32 having a flattened circular cross section. The outer rib 32 has a tapered shape to allow for large and flexible bending. This allows the outer rib 32 to bend more than when it is not tapered. The outer rib 32 may have a circular cross-sectional shape as shown in FIG. 5(A) or other shapes. The outer rib 32 may be flattened in the inner and outer directions of the umbrella 1 as shown in FIG. 5(B) to allow the outer rib 32 to bend easily in the inner and outer directions of the umbrella 1. The outer rib 32 may be elliptical or other shapes as long as it is flat. The outer rib 32 may be solid.

[0019] (3-2-2. Length of outer bone 32) In order to increase the amount of movement of the outer ribs 32 and further reduce the wind pressure on the umbrella 1, it is preferable that the length of the outer ribs 32 in the direction in which the ribs 3 extend is 120% or more of the length of the inner ribs 31.

[0020] (4. Support structure of the outer bone 32) FIG. 6(A) is a diagram for explaining the connection center S, the connection point F, and the support structure 6. FIG. The inner rib 31 and the outer rib 32 can be connected using a shaft as shown in Fig. 6(B) or using an elastic member as shown in Fig. 6(C). When a shaft is used, the shaft becomes the connection center S between the inner rib 31 and the outer rib 32. When an elastic member such as a coil spring is used, the longitudinal center of the elastic member becomes the connection center S between the inner rib 31 and the outer rib 32. The tip of the support rib 4 is connected to a dowel fixed to the inner rib 31 using a shaft. The shaft becomes the connection point F between the support rib 4 and the inner rib 31.

[0021] 6(A), the inner ribs 31, the support ribs 4, and the portion 212 between the upper turntable 22 and the lower turntable 23 in the center shaft body 21 are rotatably connected to each other to form a triangular framework as the support structure 6 for the outer ribs 32. A truss structure is known in which the load is only applied to each element in the axial direction when a load is applied, and the support structure 6 is similar to a truss structure, and is a strong structure against the input of a load from the base end of the outer ribs 32.

[0022] The connection center S between the inner rib 31 and the outer rib 32 is preferably located near the connection point F, which is the apex with the highest strength and rigidity in the support structure 6. Specifically, in the extension direction of the rib 3, the distance H from the connection point F to the connection center S between the inner rib 31 and the outer rib 32 is preferably 1 / 30 or less of the length of the rib 3. For example, the distance H is preferably 25 mm or less. As a result, in this embodiment, the base end of the outer rib 32 can be firmly supported by the support structure 6, so that the outer rib 32 can be smoothly deformed, and shaking and rattling caused in the umbrella 1 due to the movement of the outer rib 32 can be suppressed.

[0023] (5. Connection method between inner bone 31 and outer bone 32) (5-1. Contact, non-contact) The inner rib 31 and the outer rib 32 can be connected in the following two ways, A1) and A2). A1) The inner bone 31 and the outer bone 32 are connected in a state of contact with each other by a shaft and a bearing portion, The variable device applies a restoring force to the exoskeleton 32. A2) The inner bone 31 and the outer bone 32 are connected in a separated state by a variable device, The variable device applies a restoring force to the exoskeleton 32 .

[0024] (5-2. Fulcrum joint 53) The connection method between the inner bone 31 and the outer bone 32 includes the following B) which is included in A1). B) The inner bone 31 and the outer bone 32 are connected to a fulcrum joint 53 ( As shown in Fig. 10 and 11, the connection is made in a contact state, and the external variable device is used to Alternatively, a restoring force is applied to the exoskeleton 32 by a built-in deformable portion.

[0025] (5-3. Variable device) As the variable device that imparts a restoring force to the exoskeleton 32, the following C1) to C4) can be exemplified. C1) Torsion coil spring 51 (Fig. 9) C2) Hinge springs 521, 522 (Fig. 9) C3) Wave spring 54 (Fig. 12) C4) Cylindrical coil spring 56 (Fig. 13)

[0026] (6.A1) Combination of contact connection and C1) torsion coil spring 51) Fig. 7(A) is a side view showing the connection mechanism 5 between the inner bone 31 and the outer bone 32. Fig. 7(B) is a cross-sectional view showing the connection mechanism 5, in which only the inner bone 31 is hatched. In the connection mechanism 5, a pair of arms 311 that protrude toward the tip side and face each other in the horizontal direction are formed at the tip end of the inner rib 31. A hole 312 (bearing) that passes through the arms 311 is formed in the arms 311. The base end of the outer rib 32 is disposed between the arms 311. The outer rib 32 has shafts 321 that extend from the base end to both outer sides in the horizontal direction (a first direction perpendicular to the axial direction of the center shaft 2). The holes 312 rotatably receive the shafts 321.

[0027] The outer rib 32 is given a restoring force by the torsion coil spring 51 to a reference position (the position of the outer rib 32 when no wind pressure is applied to the umbrella 1 when the umbrella is unfolded) along the extension direction of the ribs 3. The coil portion 511 of the torsion coil spring 51 is fitted to the shaft portion 321 protruding outward from the arm portion 311. The tip of the arm portion 512 (first arm portion) extending from one end of the coil portion 511 is bent inward and inserted into a hole portion 313 formed in the side surface of the inner rib 31 to be connected to the arm portion 512, for example, bonded to the arm portion 512 with an adhesive or the like. Similarly, the tip of the arm portion 513 (second arm portion) extending from the other end of the coil portion 511 is bent inward and inserted into a hole portion 322 formed in the side surface of the outer rib 32 to be connected to the arm portion 513, for example, bonded to the arm portion 513 with an adhesive or the like. Such a connection mechanism 5 can smoothly bend the outer bone 32 in the vertical direction relative to the inner bone 31, and can provide the outer bone 32 with a restoring force to the reference position with a simple configuration.

[0028] The torsion coil spring 51 may be provided on both sides in the horizontal direction of the inner bone 31 and the outer bone 32. The connection point F between the support 4 and the inner bone 31 is located on the inner bone 31 closer to the base end side (the right side in FIG. 7(A)) than the connection center S (the central axis of the shaft portion 321) of the outer bone 32 to the inner bone 31 and in the vicinity of the connection center S.

[0029] Fig. 8(A) is a side view showing the connection mechanism 5A, and Fig. 8(B) is a cross-sectional view showing the connection mechanism 5A, in which only the inner bone 31 is hatched. In the connection mechanism 5, the part of the arm 311 that rotatably receives the shaft 321 is a closed circular hole 312, but in the connection mechanism 5A, a part of the hole is opened to form a receiving part 312A (bearing part). The other configurations of the connection mechanism 5A are the same as those of the connection mechanism 5. The size of the open part of the receiving part 312A is at least large enough for the shaft 321 to cross. In this embodiment, the receiving part 312A includes an arc-shaped part that receives the shaft 321 and a slit that extends from the arc-shaped part to the tip of the arm 311 and is opened at the tip. In this embodiment, the outer bone 32 can be connected to the inner bone 31 by inserting the shaft 321 into the receiving part 312A, sliding it to the back, and installing the torsion coil spring 51, which makes the connection easy.

[0030] (7.C2) Hinge springs 521, 522 are added to the connection mechanism 5 of FIG. 7. Fig. 9(A) is a side view showing the connection mechanism 5B, and Fig. 9(B) is a cross-sectional view showing the connection mechanism 5B, in which only the inner bone 31 is hatched. The connection mechanism 5B is obtained by adding hinge springs 521 and 522 to the connection mechanism 5, and the other configurations are the same as those of the connection mechanism 5. The hinge spring 521 protrudes from the upper side (outside of the umbrella 1) of FIG. 9(A) of the tip surface of the inner rib 31 between the arms 311, and is flexible. When the outer rib 32 rotates to the outside of the umbrella 1, the hinge spring 521 presses against the outer surface of the base end of the outer rib 32, and urges the base end of the outer rib 32 toward the inside of the umbrella 1. The hinge spring 522 protrudes from the lower side (inside of the umbrella 1) of FIG. 9(A) of the tip surface of the inner rib 31 between the arms 311, and is flexible. When the outer rib 32 rotates to the inside of the umbrella 1, the hinge spring 522 presses against the outer surface of the base end of the outer rib 32, and urges the base end of the outer rib 32 toward the inside of the umbrella 1. In the connection mechanism 5B, in addition to the torsion coil spring 51, hinge springs 521, 522 can apply a restoring force to the exoskeleton 32 to the reference position. Only one of the hinge springs 521, 522 may be provided. The torsion coil spring 51 does not have to be provided. The hinge springs 521, 522 may be provided in the connection mechanism 5A and a connection mechanism 5C (FIG. 10) described later.

[0031] (8-1. Fulcrum joint 53) Fig. 10(A) is a side view showing the connection mechanism 5C, and Fig. 10(B) is a cross-sectional view showing the connection mechanism 5C, in which only the fulcrum joint 53 is hatched. In the connection mechanism 5C, the tip of the inner bone 31 in the connection mechanism 5 in Fig. 7 is replaced with a fulcrum joint 53 separate from the inner bone 31. The other configuration is the same as that of the connection mechanism 5 in Fig. 7. In this embodiment, the inner bone 31 includes an inner bone body 310 whose base end is rotatably connected to the upper turntable 22, and a fulcrum joint 53 made of resin, fixed to the inner bone body 310, and to which the outer bone 32 and the support rib 4 are rotatably connected. A hole 531 is formed at the base end of the fulcrum joint 53 into which the tip of the inner bone body 310 is fitted and joined. The other configuration of the fulcrum joint 53 is the same as that of the tip of the inner bone 31 in Fig. 7.

[0032] The fulcrum joint 53 can be made of an appropriate resin, and can be made of a thermoplastic resin containing a fiber-based filler such as glass fiber to obtain high rigidity and strength. The inner rib body 310 can be made of a metal such as iron, stainless steel, or aluminum alloy, or can be made of a thermoplastic resin containing a fiber-based filler. The outer rib 32 is rotatably connected to the fulcrum joint 53. The end of the support rib 4 is rotatably connected to the fulcrum joint 53 via a boss 61. The boss 61 can be integral with the fulcrum joint 53 or can be separate. In this embodiment, the part with a complex shape is made of a resin fulcrum joint 53 and is separate from the inner rib 31, making it easy to manufacture the umbrella 1. Since the part supporting the outer rib 32 is made an independent part as the fulcrum joint 53, the inner rib body 310 can be made to be suitably thin, and the fulcrum joint 53 can be made thick, so that the strength required to support the outer rib 32 can be easily ensured. Although one end of the torsion coil spring 51 (the right end in FIG. 10(A)) is connected to the fulcrum joint 53, it may extend to the inner bone main body 310 and be connected to the inner bone main body 310.

[0033] (8-2. Add hinge springs 521 and 522 to fulcrum joint 53) Fig. 11(A) is a side view showing the connection mechanism 5D, and Fig. 11(B) is a cross-sectional view showing the connection mechanism 5D, in which only the fulcrum joint 53 is hatched. 9. The connection mechanism 5D adds hinge springs 521, 522 to the fulcrum joint 53 in the connection mechanism 5C. In other words, the tip end of the inner bone 31 in the connection mechanism 5B in FIG.

[0034] (9.A2) Combination of non-contact connection and C3) corrugated rod spring 54) 12(A) is a side view showing the connection mechanism 5E, and shows a cross section of the displacement prevention tube 55. FIG. In the connection mechanism 5E, the outer rib 32 is connected to the inner rib 21 in a bendable manner while being separated from the inner rib 31, and the corrugated rod-shaped spring 54 applies a restoring force to the outer rib 32 to a reference position. The rib 3 is constituted by including the corrugated rod-shaped spring 54 and the slippage prevention tube 55. The slippage prevention tube 55 is a flexible metal plate rolled into a cylindrical shape, and is fitted between the tip of the inner rib 31 and the base end of the outer rib 32 located away from the tip of the inner rib 31, and is joined to the outer surfaces of the inner rib 31 and the outer rib 32 by adhesive or the like. The slippage prevention tube 55 may be a cylindrical rubber tube or a cylindrical coil. The slippage prevention tube 55 suppresses the outer rib 32 from slipping in the cross-sectional direction and the axial direction relative to the inner rib 31. In addition, since the corrugated rod-shaped spring 54 has a function as a spring member more than the slippage prevention tube 55, the slippage prevention tube 55 may be omitted.

[0035] The corrugated rod spring 54 is a rod-shaped spring member, and is attached to both horizontal side surfaces of the tip end of the inner bone 31 and the base end of the outer bone 32 from the outside of the slippage prevention tube 55. A plurality of (for example, two) pins 541 are erected on both longitudinal ends of the corrugated rod spring 54. Meanwhile, at the tip end of the inner bone 31 and the base end of the outer bone 32, holes 314, 323 are formed at intervals along the extension direction of the inner bone 31 and the outer bone 32 in the center in the thickness direction of the inner bone 31 and the outer bone 32. The pins 541 are inserted into the holes 314, 323 and joined by adhesive or the like.

[0036] In this way, the first end of the corrugated rod spring 54, which is the right side of Fig. 12(A), is connected to the inner rib 31, and the second end, which is the left side of Fig. 12(A), is connected to the outer rib 32. A corrugated portion 521 is formed in the longitudinal center of the corrugated rod spring 54. The corrugated portion 521 provides a restoring force to the second end side against deformation of the second end side, which is the left side of Fig. 12(A). The dowel 61 is provided inside the umbrella 1 at the tip of the inner rib 31, at a position not overlapping with the slippage prevention tube 55. The midpoint between the tip of the inner rib 31 and the base end of the outer rib 32 becomes the connection center S of the inner rib 31 and the outer rib 32.

[0037] In this example, the outer ribs 32 are connected to the inner ribs 31 without using any axis, so that they can be bent in any suitable direction, and wind pressure can be efficiently released.

[0038] (10.A2) Combination of non-contact connection and C4) Cylindrical coil spring 56) FIG. 13 is a side view showing the connection mechanism 5F. The connection mechanism 5F also includes a cylindrical coil spring 56 that connects the outer rib 32 to the inner rib 31 in a bendable manner while being separated from the inner rib 31, and applies a restoring force to the outer rib 32 to a reference position. The parent rib 3 includes the cylindrical coil spring 56. In the connection mechanism 5E, a first end of the cylindrical coil spring 56 is fixed to the inner rib 31 in a state where it is inserted into the inner rib 31 from the distal end surface of the inner rib 31. A second end of the cylindrical coil spring 56 is fixed to the outer rib 32 in a state where it is inserted into the outer rib 32 from the proximal end surface of the outer rib 32. Specifically, a hole 315 is formed in the distal end surface of the inner rib 31, and a hole 324 is formed in the proximal end surface of the outer rib 32. The first end of the cylindrical coil spring 56 is inserted into the hole 315 and bonded to the hole 315 by adhesion or the like. The second end of the cylindrical coil spring 56 is inserted into the hole 324 and bonded to the hole 324 by adhesion or the like. The dowel 61 is provided on the inside of the umbrella 1 at the tip of the inner rib 31.

[0039] In this example, the outer ribs 32 are connected to the inner ribs 31 without using an axis, so they can be bent in any direction and wind pressure can be efficiently released. The cylindrical coil spring 56 is connected to the tip surface of the inner ribs 31, so a dowel 61 can be installed at the tip of the inner ribs 31. Therefore, in this example, the connection point F between the ribs 4 and the inner ribs 31 can be located very close to the tip of the inner ribs 31, so the outer ribs 32 can be firmly supported and rattling of the umbrella 1 caused by deformation of the outer ribs 32 can be suppressed.

[0040] The present invention can be implemented in the embodiments without departing from its features. The embodiments, modifications, and effects are merely illustrative and should not be construed as limiting the present invention. The features and structures of the embodiments and modifications can be added and combined in various ways to obtain alternative configurations. [Explanation of symbols]

[0041] 1...umbrella, 2...center axis, 3...main rib, 4...support rib, 22...upper wheel, 23...lower wheel, 31...inner rib, 32...outer rib, 53...fulcrum joint, 310...inner rib body.

Claims

1. A central shaft having an upper wheel and a lower wheel; A plurality of ribs are provided in the circumferential direction of the upper turntable, An inner bone having a base end rotatably connected to the upper wheel; The main rib is connected to the inner rib so as to be bendable inward and outward of the umbrella, and is given a restoring force to a reference position when the umbrella is opened. The main rib is made of a thermoplastic resin containing a fiber-based filler and has a tapered shape, so that the main rib can bend relative to the inner rib and flex under wind pressure. A plurality of ribs are provided around the lower wheel in a circumferential direction, the base end of the rib is rotatably connected to the lower wheel, and the tip of the rib is rotatably connected to the tip of the inner rib. An umbrella equipped with

2. The umbrella according to claim 1, An umbrella in which the length of the outer rib is 120% or more of the length of the inner rib.

3. The umbrella according to claim 1, The outer rib is solid and has a cross-sectional shape that is flattened inward and outward directions of the umbrella.

4. The umbrella according to claim 1, The inner rib of the umbrella is made of metal.

5. The umbrella according to claim 1, An umbrella in which the distance from the connection point between the inner rib and the support rib to the connection center between the inner rib and the outer rib in the direction in which the ribs extend is 1 / 30 or less of the length of the rib.

6. In the umbrella according to any one of claims 1 to 3 and claim 5, The inner bone is An inner bone body having a base end rotatably connected to the upper turntable; The umbrella comprises a fulcrum joint made of resin, fixed to the inner rib body, and to which the outer rib and the support rib are rotatably connected.

7. The umbrella according to claim 6, The exoskeleton includes a shaft portion extending on both sides in a first direction perpendicular to an axial direction of the central shaft, The tip of the fulcrum joint is formed with a pair of arms equipped with a bearing portion that rotatably receives the shaft portion, and a hinge spring that presses against the outer surface of the base end portion of the exoskeleton when the exoskeleton rotates, and applies a restoring force to the exoskeleton to a reference position.

8. The umbrella according to claim 6, The exoskeleton includes a shaft portion extending on both sides in a first direction perpendicular to an axial direction of the central shaft, The fulcrum joint is formed with a pair of arms having bearings for rotatably receiving the shaft portion, At least one of the shaft portions extends through the bearing portion to an outside of the arm portion, An umbrella comprising a coil portion fitted to the shaft portion, a first arm portion extending from the coil portion and connecting to the inner rib, and a second arm portion extending from the coil portion and connecting to the outer rib, and comprising a torsion coil spring that applies a restoring force to the outer rib to return it to a reference position.

9. The umbrella according to any one of claims 1 to 5, The exoskeleton includes a shaft portion extending on both sides in a first direction perpendicular to an axial direction of the central shaft, A pair of arms having bearings for rotatably receiving the shaft are formed at the tip of the inner bone, At least one of the shaft portions extends through the bearing portion to an outside of the arm portion, An umbrella comprising a coil portion fitted to the shaft portion, a first arm portion extending from the coil portion and connecting to the inner rib, and a second arm portion extending from the coil portion and connecting to the outer rib, and comprising a torsion coil spring that applies a restoring force to the outer rib to return it to a reference position.

10. The umbrella according to any one of claims 1 to 5, a wave-shaped bar spring that connects the outer bone to the inner bone in a state separated from the inner bone and applies the restoring force to the outer bone; The wave-shaped rod spring has a first end connected to the inner rib and a second end connected to the outer rib, and a wave-shaped portion is formed in the center to impart a restoring force to the second end in response to deformation on the second end.

11. The umbrella according to any one of claims 1 to 5, The main rib is fixed to the inner rib with a first end inserted into the inside of the inner rib from the tip surface of the inner rib and a second end connected to the outer rib, and the outer rib is connected to the inner rib while being separated from the inner rib, and a coil spring is provided in the umbrella to apply a restoring force to the outer rib to a reference position.

12. A fulcrum joint for an umbrella in which an outer rib constituting a tip side of a rib is connected to an inner rib constituting a base side of the rib so as to be bendable toward the inside and outside of the umbrella, and a restoring force to a reference position is applied when the umbrella is opened, and a tip of a support rib is connected to a tip part of the inner rib, The inner rib includes an inner rib body having a base end rotatably connected to the central axis of the umbrella, and the fulcrum joint, The fulcrum joint is made of resin and is fixed to the tip of the inner bone body, and is a fulcrum joint to which the outer bone and the support bone are rotatably connected.

13. The fulcrum joint according to claim 12, The exoskeleton includes a shaft portion extending on both sides in a first direction perpendicular to an axial direction of the central shaft, The fulcrum joint is formed at its tip with a pair of arms having a bearing portion that rotatably receives the shaft portion, and a hinge spring that holds down the outer surface of the base end portion of the exoskeleton when the exoskeleton rotates, and applies a restoring force to the exoskeleton to a reference position.

14. The fulcrum joint according to claim 12, The exoskeleton includes a shaft portion extending on both sides in a first direction perpendicular to an axial direction of the central shaft, The fulcrum joint is formed with a pair of arms having bearings for rotatably receiving the shaft portion, At least one of the shaft portions extends through the bearing portion to an outside of the arm portion, A fulcrum joint in which a coil portion of a torsion coil spring is fitted into the shaft portion, a first arm portion extending from the coil portion of the torsion coil spring is connected to the fulcrum joint, and a second arm portion extending from the coil portion of the torsion coil spring is connected to the exoskeleton, thereby applying a restoring force to the exoskeleton to return it to a reference position.

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