JP6168703B2 - Brake wire protection structure for wheelbarrow and wire sleeve used therefor - Google Patents

Description

  The present invention relates to a structure for protecting a brake wire of a wheelbarrow such as a walking assistance vehicle, a care wheelchair, or a baby carriage, and a wire sleeve used therefor.

  As such a handcart, for example, a configuration as disclosed in Patent Document 1 is well known. Such a configuration includes a brake unit (brake) that brakes rotation of the wheel, and a wire (brake wire) is stretched between an operation lever operated by an assistant or a user and the brake. As a reference, Patent Document 2 discloses a cane with a wheel in which a brake wire is inserted into a main body frame in order to improve the appearance around the handle.

  Moreover, in the above brake wire, what was covered with the wire tube is generally used for the purpose of preventing the occurrence of rust and preventing the damage due to wear (see FIG. 7a). More specifically, as shown in FIG. 7 a, the wire tube 50 has a multi-layer structure, and a polyethylene (PE) resin layer 52 disposed around the brake wire 51 and an outer side of the PE resin layer 52. Steel plate coil 53 and a vinyl chloride resin layer 54 formed on the outer periphery of the steel plate coil 53. The PE resin layer 52 plays a role of improving the slip of the brake wire 51, and the steel plate coil 53 plays a role of improving the strength while ensuring the flexibility of the wire tube 50. The vinyl chloride resin layer 54 serves to protect the steel plate coil 53.

Japanese Patent No. 3415800 Japanese Patent Laid-Open No. 11-332928

  However, as shown in FIG. 7b, when the brake wire 51 covered with the wire tube 50 is bent and disposed in the vicinity of the brake operation portion, the PE resin layer in the wire tube 50 at the bent portion is obtained due to long-term use. 52 may be broken by the corners of the steel sheet coil 53 so that the steel sheet coil 53 is exposed on the inner surface, and the corners of the steel sheet coil 53 and the brake wire 51 may come into contact with each other. It was. Further, if such a situation continues for a long time, the brake wire 51 may be rubbed by the steel plate coil 53, and the brake wire 51 may be broken.

  Therefore, the present invention has a structure in which a brake wire covered with a wire tube is inserted into a frame pipe, and can prevent excessive breakage of the brake wire and breakage of the brake wire. An object of the present invention is to provide a brake wire protection structure for use, and a wire sleeve used therefor.

  The present invention has a frame pipe provided with a wheel and a handle portion, the handle portion is provided with a brake handle portion for braking the wheel, and the brake handle portion is attached to the wheel from the brake portion. A brake wire is disposed over the part, and a main part of the brake wire is inserted into the frame pipe, and an end of the brake wire on the brake handle part side extends from the frame pipe to the brake handle. A wheelbarrow that is pushed out while curving toward the side, and is provided with a tubular wire sleeve that is inflexible and has a smooth inner peripheral surface with a curved portion, and one end of the wire sleeve is The wire sleeve is inserted into the frame pipe, and the other end of the wire sleeve is bent out of the frame pipe while being curved toward the brake handle portion. Is connected to the rake handle portion is further said hand brake wire protective structure for vehicles, wherein the brake wire is inserted into the wire sleeve in between the frame pipe and the brake handle portion.

  In such a configuration, since the main part of the brake wire is inserted into the frame pipe, the aesthetic appearance can be kept good. In addition, since the brake wire is not exposed to the outside between the frame pipe and the brake handle portion, it is possible to appropriately prevent the brake wire from being rusted. Furthermore, since the brake wire is curved in accordance with the curved shape of the wire sleeve that is inflexible and has a smooth inner peripheral surface, it is preferable that the brake wire is maintained in an excessively bent state. Can be prevented. Therefore, according to the present invention, it is possible to avoid a state in which residual strain occurs in the brake wire or wear that causes breakage occurs.

  Here, the state in which the brake wire is “curved” means a state in which the brake wire is bent in a bow so that no residual strain is generated, whereas the state in which the brake wire is “bent” is plastically deformed. It is a state where it bends to the extent that it does.

  Further, the brake wire is covered with a wire tube in the frame pipe, exposed in the wire sleeve, and can be brought into contact with the inner peripheral surface of the wire sleeve, and an opening end of the wire sleeve on the frame pipe side It is desirable that the wire tube in the frame pipe is in contact with the tip end portion of the wire tube on the brake handle portion side.

  By adopting such a configuration, there is no gap between the opening end on the frame pipe side of the wire sleeve and the tip end on the brake grip portion side of the wire tube. Can be prevented.

  Further, the wire sleeve has a straight portion disposed in the frame pipe, and a curved portion that is formed to extend in a curved shape from the straight portion toward the brake handle portion side. desirable.

  Here, when assembling the wheelbarrow or replacing the brake parts during maintenance, the brake wire is inserted from the frame pipe side of the wire sleeve. It will insert from a straight part, and the axial direction and insertion direction of a brake wire, and the axial direction of this linear part correspond all. For this reason, there exists an advantage which is easy to insert this brake wire in this wire sleeve. In addition, when the wire sleeve has a straight portion in this way, the axial direction of the brake wire is defined by the straight portion even when tension is generated in the brake wire due to the brake operation. The direction of the brake wire does not change greatly, and the contact state between the wire tube covering the brake wire and the wire sleeve can be suitably maintained.

  In addition, the frame pipe side opening end of the wire sleeve and the brake handle of the wire tube are arranged at a portion where the frame pipe side opening end of the wire sleeve abuts on the brake grip side of the wire tube. It is desirable to provide a misalignment prevention means for arranging the part-side tip part on the same axis.

  By setting it as this structure, the contact state of a wire sleeve and a wire tube can be maintained still more reliably.

  Here, it can be proposed that the misalignment prevention means is configured to have a structure in which a brake grip side end of the wire tube is fitted and fixed to a frame pipe side opening end of the wire sleeve.

  With this configuration, the wire sleeve and the wire tube are easily brought into contact with each other in the frame pipe without visual inspection when assembling the wheelbarrow or replacing brake parts.

  Moreover, the position shift prevention means may be configured to have a structure in which the end surface of the wire sleeve on the frame pipe side opening end portion and the end surface of the wire tube on the brake handle portion side end portion are abutted and fixed.

  Even if it is set as this structure, when assembling the wheelbarrow or exchanging brake parts, the wire sleeve and the wire tube are easily brought into contact with each other in the frame pipe without visual inspection. Moreover, since the end surfaces of the wire sleeve and the wire tube are in full contact with each other, it is possible to more reliably avoid a gap at the contact portion.

  It is desirable that the inner diameter of the end face of the wire sleeve on the frame pipe side opening end and the inner diameter of the end face of the wire tube on the tip side of the brake grip part be substantially the same.

  By adopting such a configuration, a step does not occur at the boundary between the inner peripheral surface of the wire sleeve and the inner peripheral surface of the wire tube, and the brake wire is worn by this boundary, or the brake wire is Can be prevented from being caught.

  Further, the present invention is a wire sleeve used in the brake wire protection structure for a handcart, wherein the frame pipe and the brake handle portion are formed of a separate cylindrical member. is there.

  By adopting such a configuration, it is possible to replace only the wire sleeve by maintenance, thereby improving work efficiency and reducing the cost as a whole.

  The wire sleeve includes a bending portion located at the center, a first straight portion extending from the bending portion toward the frame pipe, and a second extending from the bending portion toward the brake handle portion. It is desirable that the first straight portion and the second straight portion have substantially the same axial length.

  By adopting such a configuration, the wire sleeve is properly arranged regardless of which straight portion is inserted into the frame pipe, so that the mounting work can be performed without considering the direction of the wire sleeve, and the workability is greatly improved. To improve.

  The brake wire protection structure for a wheelbarrow of the present invention can prevent the brake wire from being bent excessively and prevent the breakage of the brake wire.

  In addition, the wire sleeve of the present invention has an effect that the replacement becomes extremely easy at the time of maintenance.

It is the whole wheelbarrow perspective view. It is a side view which expands and shows a handle part. It is a sectional side view which expands and shows a handle | steering-wheel part. (A) is a partially cutaway side view of a wire sleeve, and (b) is an AA line cut end view of (a). It is a partially notched side view which shows the contact state of a wire sleeve and a wire tube. It is explanatory drawing explaining the other embodiment of a wire sleeve. (A) shows the wire tube of a conventional structure, (b) is explanatory drawing explaining abrasion of a brake wire.

  Hereinafter, the embodiment which actualized brake wire protection structure 1A for handcarts of the present invention (henceforth suitably called brake wire protection structure 1A) is described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

  As shown in FIG. 1, the handcart 1 is extended to the upper side from a pair of left and right base pipe portions 4, 4 to which a front wheel 2 a and a rear wheel 2 b are attached, and the base pipe portions 4, 4. Frame pipes 3 and 3 including handle post portions 5 and 5 and height-adjustable handle pipe portions 6 and 6 that are nested inside the handle post portions 5 and 5, respectively. .

  The pair of left and right frame pipes 3 and 3 are connected by a foldable X frame 7, and a seat portion 8 is formed on the upper side of the X frame 7. Further, a luggage compartment 9 is attached to the front side of the seat portion 8. Further, a band plate-shaped backrest portion 10 is bridged between the pair of left and right handle pipe portions 6 and 6.

  A brake unit 11 for braking the rear wheel 2b is attached to the rear wheel 2b. The brake unit 11 employs a well-known configuration using a brake wire 12 (see FIG. 3), and detailed description thereof is omitted.

  On the other hand, as shown in FIG. 2, the handle pipe portion 6 includes a handle portion 15 having a grip portion 14. The handle portion 15 is provided with a brake handle portion 16 including a base portion 17 attached to the front side of the grip portion 14 and a brake lever 18 pivotally supported on the base portion 17.

  As shown in FIGS. 2 and 3, the frame pipe 3 (specifically, the handle pipe) is located at the upper end of the frame pipe 3 and in the portion of the handle pipe portion 6 that faces the brake handle portion 16. A through-hole 60 is formed to communicate the inside and outside of the part 6).

  As shown in FIG. 3 and the like, after the upper end portion of the brake wire 12 whose lower end is connected to the brake portion 11 is inserted into the frame pipe 3, the frame pipe 3 is exposed to the outside from the through hole 60. It is inserted and connected to the brake handle 16. With this configuration, the brake part 11 and the brake handle part 16 are connected via the brake wire 12, and the rear wheel 2b can be braked.

Next, the brake wire protection structure 1A will be described in detail.
A wire sleeve receiving port 25 is formed at a position on the front surface of the brake handle 16 and facing the through hole 60, and the brake wire protection structure 1 </ b> A is made of metal disposed in the wire sleeve receiving port 25. The wire sleeve 20 is provided.

  More specifically, as shown in FIG. 4, the wire sleeve 20 is a cylindrical member having a curved shape that is inflexible and has a smooth inner peripheral surface, and includes a curved portion 34 located at the center, and the curved portion 34. The first straight portion 35 is formed to extend downward from the first straight portion 35, and the second straight portion 36 is formed to extend upward from the curved portion 34. In addition, the axial length of the first linear portion 35 and the axial length of the second linear portion 36 are set to dimensions and shapes.

  Then, in a state where the frame pipe side opening end portion 21a of the wire sleeve 20 is inserted into the frame pipe 3 through the through hole 60, the brake handle portion side opening end portion 22 of the wire sleeve 20 is It is fixed to the wire sleeve receptacle 25 of the brake handle 16.

  With this configuration, the wire sleeve 20 that is separate from the frame pipe 3 and the brake handle portion 16 is disposed in the handle portion 15, and the second straight portion 36 is formed on the brake portion 34 with reference to the curved portion 34 of the wire sleeve 20. The first straight portion 35 of the wire sleeve 20 extends toward the handle pipe 16 and extends toward the frame pipe 3.

  A portion of the frame pipe 3 excluding the upper end of the brake wire 12 is covered with a wire tube 19. For the wire tube 19, a known technique can be suitably employed. For example, a configuration as shown in FIG. 7A is proposed.

  On the other hand, as shown in FIG. 3, the upper end portion of the brake wire 12 is exposed without being covered by the wire tube 19, and the exposed portion is inserted into the wire sleeve 20. Yes. That is, the brake wire 12 is in contact with the inner peripheral surface of the wire sleeve 20, and the brake wire 12 is curved along the curved portion 34 of the wire sleeve 20.

  As shown in FIG. 5, the opening end 21 a (frame pipe side opening end 21 a) located on the frame pipe 3 side of the wire sleeve 20 is a brake handle portion of the wire tube 19 in the frame pipe 3. It is in surface contact over the entire circumference by abutting against the tip 19a (brake handle portion tip 19a) located on the 16th side. The inner diameter of the end face 21a of the wire sleeve 20 on the frame pipe side and the inner diameter of the tip 19a of the wire tube 19 on the brake handle side are set to be approximately the same.

  In the configuration described so far, when the brake lever 18 is operated to brake the rear wheel 2b, the brake wire 12 is pulled to the brake lever 18 side, and the brake unit 11 is operated to brake the rear wheel 2b. Is done. At this time, in the wire sleeve 20, the brake wire 12 slides in the axial direction while maintaining an appropriate curved shape according to the curved shape of the wire sleeve 20.

  As described above, in the brake wire protection structure 1 </ b> A, the main part of the brake wire 12 is inserted into the frame pipe 3, so that a good aesthetic appearance is maintained. In addition, since the brake wire 12 is covered with the wire sleeve 20 between the frame pipe 3 and the brake handle portion 16, the rust of the brake wire 12 can be appropriately prevented.

  Furthermore, since the brake wire 12 is not excessively bent in the vicinity of the brake handle 16, an excessive load is not applied to the brake wire 12.

  Further, since it is suppressed that a gap is formed between the frame pipe side opening end portion 21a of the wire sleeve 20 and the brake grip portion side tip portion 19a of the wire tube 19, foreign matter enters from the portion. Or rusting is prevented.

  In addition, since the first straight portion 35 of the wire sleeve 20 is disposed in the frame pipe 3, the axial direction of the brake wire 12 and the insertion direction thereof, and the shaft of the first straight portion 35 when replacing brake components, etc. The directions are the same. Therefore, the brake wire 12 can be easily inserted into the wire sleeve 20. In addition, when the first straight portion 35 is formed on the wire sleeve 20 in this way, the axial direction of the brake wire 12 is the first direction even when tension is generated in the brake wire 12 due to the brake operation. Since the direction of the brake wire 12 is not greatly changed because it is defined by the straight portion 35, the contact state between the wire tube 19 covering the brake wire 12 and the wire sleeve 20 can be suitably maintained. it can.

  Moreover, since the inner diameter of the end surface of the frame pipe side opening end portion 21a of the wire sleeve 20 and the inner diameter of the end surface 19a of the brake handle portion side end portion of the wire tube 19 are substantially the same, A step does not occur at the boundary between the inner peripheral surface and the inner peripheral surface of the wire tube 19, and the brake wire 12 may be worn by this boundary, or the brake wire 12 may be caught at this boundary. It is prevented.

  Further, since the wire sleeve 20 is configured separately from the frame pipe 3 and the brake handle portion 16, only the wire sleeve 20 can be easily replaced during maintenance, for example. Moreover, since the axial length of the 1st linear part 35 and the axial length of the 2nd linear part 36 are substantially the same as the said wire sleeve 20, the direction of the wire sleeve 20 is considered at the time of replacement | exchange of the wire sleeve 20, for example. Installation work can be performed without any problems.

  By the way, the frame pipe side opening end portion 21a of the wire sleeve 20 and the portion where the frame pipe side opening end portion 21a of the wire sleeve 20 and the brake handle portion side tip portion 19a of the wire tube 19 abut, Misalignment preventing means for arranging the wire tube 19 on the brake handle portion side tip portion 19a on the same axis may be provided.

  For example, as shown in FIG. 6 a, the structure for preventing misalignment is a structure in which the end surface of the opening end 21 b on the frame pipe side of the wire sleeve 20 and the end surface of the tip 19 b on the brake grip side of the wire tube 19 are fixed. It may be comprised. By adopting such a configuration, the frame pipe side opening end portion 21b of the wire sleeve 20 and the brake handle portion side tip portion 19b of the wire tube 19 can be arranged on the same axis, and mutual rotation is also prevented. Further, it is possible to prevent the right and left positional deviation between the wire sleeve 20 and the wire tube 19 and to make the contact more reliably. 6a has a structure in which the end surface of the frame pipe side opening end portion 21b and the end surface of the brake handle portion side tip portion 19b of the wire tube 19 are inclined with respect to the axial direction of the brake wire 12. However, as shown in FIG. 6b, the end surface of the frame pipe side opening end portion 21c and the end surface of the brake handle portion side tip end portion 19c of the wire tube 19 may have a curved shape. Further, as shown in FIG. 6 c, the structure may be such that the end surface of the frame pipe side opening end portion 21 d and the end surface of the brake handle portion side tip portion 19 d of the wire tube 19 have an uneven shape.

  Further, as shown in FIG. 6d, the position shift prevention means is configured to fit and fix the brake grip side end 19e of the wire tube 19 to the frame pipe side opening end 21e of the wire sleeve 20. It may be. With this configuration, the wire sleeve 20 and the wire tube 19 can be easily brought into contact with each other in the frame pipe 3 without visual inspection when assembling the handcart 1 or replacing the brake parts. . As shown in FIG. 6d, the frame pipe side opening end portion 21e may have a receiving port shape, and as shown in FIG. 6e, the diameter of the frame pipe side opening end portion 21f increases toward the end portion. It may be a tapered shape.

  The wire sleeve 20 is desirably made of metal such as stainless steel, but is not limited thereto, and may be made of, for example, a synthetic resin. Moreover, the dimension shape of the wire sleeve 20 is not limited to the said Example, According to the design shape of the handcart 1, etc., it can change suitably. Further, the present invention does not actively exclude the configuration in which the brake wire 12 is inserted into the wire sleeve 20 together with the wire tube 19.

DESCRIPTION OF SYMBOLS 1 Wheelbarrow 1A Wheelbarrow brake wire protection structure 2a Front wheel 2b Rear wheel 3 Frame pipe 11 Brake part 12 Brake wire 15 Handle part 16 Brake handle part 19 Wire tube 20 Wire sleeve 34 Bending part 35 First linear part 36 Second Straight section

Claims (9)

A frame pipe provided with a wheel and a handle portion, the handle portion being provided with a brake handle portion for braking the wheel, and a brake wire extending from the brake portion attached to the wheel to the brake handle portion; The brake wire is inserted into the frame pipe, and the brake wire end portion of the brake wire is curved from the frame pipe to the brake handle portion side. While being pushed out
A non-flexible cylindrical wire sleeve having a curved portion and a smooth inner peripheral surface is provided, one end of the wire sleeve is inserted into the frame pipe, and the other end of the wire sleeve is The brake pipe being bent from the frame pipe and connected to the brake handle, and the brake wire is inserted into the wire sleeve between the frame pipe and the brake handle. A brake wire protection structure for a wheelbarrow characterized by being inserted. The brake wire is
It is covered with a wire tube in the frame pipe, exposed in the wire sleeve, and can contact the inner peripheral surface of the wire sleeve,
The wheel wire brake wire protection structure according to claim 1, wherein a frame pipe side opening end portion of the wire sleeve is in contact with a brake grip portion side tip portion of the wire tube in the frame pipe. The wire sleeve has a straight portion disposed in the frame pipe, and a curved portion that is formed to extend in a curved shape from the straight portion toward the brake handle portion side. Brake wire protection structure for wheelbarrow as described. At the part where the frame pipe side opening end of the wire sleeve abuts on the brake handle side tip of the wire tube, the frame pipe side opening end of the wire sleeve and the brake handle side of the wire tube The brake wire protection structure for a handcart according to claim 2 or 3, further comprising a position shift prevention means for arranging the tip portion on the same axis. The misregistration prevention means includes
The brake wire protection structure for a handcart according to claim 4, wherein the brake wire protection structure for the handcart is configured to fit and fix a brake grip side end of the wire tube to an opening end on a frame pipe side of the wire sleeve. The misregistration prevention means includes
The brake wire protection for a handcart according to claim 4, wherein the wire sleeve has a structure in which an end surface of the opening end portion on the frame pipe side of the wire sleeve and an end surface of the tip end portion on the brake handle portion side of the wire tube are fixed to face each other. Construction. The brake wire protection structure for a handcart according to claim 6, wherein an inner diameter of an end surface of the wire sleeve on the frame pipe side opening end portion is substantially the same as an inner diameter of the end surface of the wire tube on the brake grip portion side end portion. . A wire sleeve used in the brake wire protection structure for a handcart according to any one of claims 1 to 7,
A wire sleeve comprising a cylindrical member separate from the frame pipe and the brake handle portion. A curved portion located in the center; a first straight portion formed to extend from the curved portion toward the frame pipe; and a second straight portion formed to extend from the curved portion to the brake handle portion.
The wire sleeve according to claim 8, wherein an axial length of the first linear portion and an axial length of the second linear portion are substantially the same.

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