JP3712811B2 - Auxiliary wheel mounting device for infant cars - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an auxiliary wheel mounting device for an infant car configured to attach a stay of an auxiliary wheel to a rear wheel hub shaft that is pivotally supported by a claw fitting of a rear frame via a stay bracket.
[0002]
[Prior art]
A typical apparatus for attaching a conventional auxiliary wheel for an infant vehicle to a body frame is disclosed in Japanese Utility Model Registration No. 3023795 shown in FIG.
In this case, a boss hole 27 of the stay bracket 23 is inserted into the rear wheel hub shaft 21 and fixed with a hub nut 22 or the like with a washer interposed, and a sill hole 28 is formed in the lower part of the stay bracket 23 along the vertical direction. The clip bolt 32 selectively inserted into one of the plurality of large-diameter portions of the daruma hole 28 is screwed and fixed to the screw hole 31 of the nut portion 29 provided on the upper portion of the stay 24 of the auxiliary wheel 25. Is.
Therefore, when it becomes necessary to adjust the height of the auxiliary wheel 25 with respect to the vehicle body with the improvement of the skill of the infant riding in the infant car, the clip bolt 32 is loosened and the nut portion on the upper part of the stay 24 of the auxiliary wheel 25 is removed. After being removed from 29, the clip bolt 32 is easily reinserted into the upper large diameter portion of the harpoon hole 28 and re-engaged with the nut portion 29 on the upper portion of the stay 24 of the auxiliary wheel 25 to easily increase its height. It can be adjusted.
[0003]
[Problems to be solved by the invention]
However, in such a conventional auxiliary wheel mounting device for infant cars, since the stay bracket and the auxiliary wheel stay are fixed by clip bolts, that is, knob bolts, in general, the fastening force is weak and it is easy to loosen. When fixing with ordinary tightening bolts, a special tool is required, and the adjustment work is troublesome for women and children.
Moreover, as described above, in order to adjust the height of the auxiliary wheel 25, the clip bolt 32 is loosened and the stay 24 of the auxiliary wheel 25 is loosened in order to selectively reinsert into the plurality of large diameter portions of the dharma hole 28. It is necessary to remove the auxiliary wheel 25 from the stay bracket 23 by removing it once from the nut portion 29 at the top of the stay bracket 23. Therefore, an infant vehicle that is not normally provided with a stand or the like is likely to fall during the adjustment work, and the work becomes more difficult.
[0004]
Therefore, the present invention solves the above-mentioned problems in the conventional auxiliary wheel mounting device for infant cars, and is an infant and a woman who is not good at mechanical work without requiring a dedicated tool or the like. An auxiliary wheel mounting device for an infant car that can adjust the height of the auxiliary wheel easily, safely and quickly.
[0005]
[Means for Solving the Problems]
Therefore, the present invention provides an auxiliary wheel mounting device for an infant car configured to attach a stay of an auxiliary wheel via a stay bracket to a rear wheel hub shaft that is pivotally supported by a claw bracket of a rear frame. A boss hole and a vertical hole arranged in the vertical direction are provided in the lower part, and a long hole and a screw hole are provided in the upper part and the lower part of the mounting plate part formed in the upper part of the stay of the auxiliary wheel. The boss hole and the long hole of the stay mounting plate portion of the auxiliary wheel are inserted into the hub axle to fix the auxiliary wheel stay slidably up and down with respect to the stay bracket. A screw portion of a spring-loaded screw having a shaft in which a large-diameter portion and a small-diameter portion conforming to the small-diameter portion are formed in the axial direction and is spring-biased in the retracted position. It is characterized in that screwed to the stay mounting plate portion of the screw hole of the serial auxiliary wheels.
Further, the present invention provides an auxiliary wheel mounting device for an infant car configured to attach a stay of an auxiliary wheel via a stay bracket to a rear wheel hub shaft that is pivotally supported by a claw bracket of a rear frame. A boss hole and a screw hole arranged in the lateral direction are provided in the lower part, and a boss hole and a screw hole are provided in the upper part and the lower part of the mounting plate part formed in the upper part of the stay of the auxiliary wheel. The hole and the boss hole of the stay mounting plate portion of the auxiliary wheel are inserted into the hub shaft, and the stay of the auxiliary wheel is fixed to the stay bracket so that it can swing back and forth. The screw portion of the spring-loaded screw having a shaft having a large-diameter portion and a small-diameter portion adapted to the small-diameter portion formed in the axial direction and spring-biased in the retracted position is provided as the above-mentioned compensation. Characterized in that screwed into the threaded hole of the stay mounting plate portion of the wheel, it is an means for these issues resolved.
[0006]
Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment of an auxiliary wheel mounting device for an infant car according to the present invention. FIG. 1 (A) is an exploded perspective view of the auxiliary wheel mounting device, and FIG. FIG. 1C is a partial cross-sectional view of the spring-loaded screw during sliding adjustment of the stay of the auxiliary wheel. FIG.
In the auxiliary wheel mounting device of the present embodiment, the stay 4 of the auxiliary wheel 5 is mounted by the hub nut 2 via the stay bracket 3 to the rear wheel hub shaft 1 that is pivotally supported by the claw fitting 6 of the rear frame 20 of the infant car. In the above structure, a boss hole 7 and a saddle hole 8 arranged in the vertical direction are provided in the upper and lower portions of the stay bracket 3, respectively, and a mounting plate portion 9 formed in the upper portion of the stay 4 of the auxiliary wheel is provided. A long hole 10 and a screw hole 11 are provided in the upper part and the lower part, and the boss hole 7 of the stay bracket 3 and the long hole 10 of the stay mounting plate part 9 of the auxiliary wheel are inserted into the hub axle 1 to fix the stay 4 of the auxiliary wheel. A large-diameter portion 14 and a small-diameter portion that are fixed to the stay bracket 3 so as to be slidable in the vertical direction, and that match the large-diameter portion and the small-diameter portion of the saddle hole 8 in the stay bracket 3. A portion 17 is formed in the axial direction and a screw portion 15 of a spring-loaded screw 12 having a shaft 17 that is spring-biased in a retracted position is screwed into the screw hole 11 of the stay mounting plate portion 9 of the auxiliary wheel. It is what.
[0007]
As shown in an enlarged view in FIG. 1B, the spring-loaded screw 12 has a shaft that forms a head portion 13, a large diameter portion 14 and a small diameter portion 17 slidably inserted into a cylindrical screw portion 15. Yes. A screw is engraved on the outer periphery of the screw portion 15, and the screw portion 15 is screwed and tightened into the screw hole 11 of the mounting plate portion 9 of the stay 4 of the auxiliary wheel by a special tool.
A coil spring 16 is mounted on the inner peripheral portion of the screw portion 15 between the outer peripheral portion of the small diameter portion 17 of the shaft. The coil spring 16 urges a flange 17F projecting from a small-diameter portion 17 of the shaft in the axial direction, and urges the shaft forming the head portion 13, the large-diameter portion 14 and the small-diameter portion 17 to a normally retracted position. are doing.
The large-diameter portion 14 of the spring-loaded screw 12 is formed to have a size compatible with the large-diameter portion in the daruma hole 8 and cannot move over the small-diameter portion in the daruma hole 8 to the adjacent large-diameter portion.
In this way, the specific large-diameter portion selectively selected in the daruma hole 8 and the large-diameter portion 14 of the spring-loaded screw 12 are engaged, and the mounting plate portion 9 of the stay 4 with respect to the stay bracket 3. Does not slide up and down.
[0008]
Next, when it becomes necessary to adjust the height of the auxiliary wheel 5 with respect to the stay bracket 3, as shown in FIG. The coil spring 16 mounted on the inner peripheral portion of the screw portion 15 is compressed and pulled out so that the small-diameter portion 17 of the shaft faces the position of the dart hole 8 of the stay bracket 3. It becomes possible for the part 17 to clear the small diameter part of the daruma hole 8 and move to the upper and lower adjacent large diameter parts.
Thus, it is easy to adjust the height of the auxiliary wheel 5 by the relative movement of the auxiliary wheel 5 with respect to the stay bracket 3 in the vertical direction.
When the finger is released from the head 13 of the spring-loaded screw 12 at a position where the height of the auxiliary wheel 5 is optimum, the spring-loaded screw 12 is restored as shown in FIG. The large-diameter portion 14 engages with the optimum large-diameter portion in the daruma hole 8 of the stay bracket 3 to fix the stay 4, thereby obtaining a predetermined adjustment height of the auxiliary wheel 5.
[0009]
FIG. 2 is an exploded perspective view showing a second embodiment of the auxiliary wheel mounting device for an infant car of the present invention.
In the auxiliary wheel mounting device of the present embodiment, the stay 4 of the auxiliary wheel 5 is mounted by the hub nut 2 via the stay bracket 3 to the rear wheel hub shaft 1 that is pivotally supported by the claw fitting 6 of the rear frame 20 of the infant car. The boss hole 7 and the saddle hole 8 disposed in the lateral direction are provided in the upper and lower portions of the stay bracket 3, respectively, and the mounting plate portion 9 is formed in the upper portion of the stay 4 of the auxiliary wheel. A boss hole 18 and a screw hole 11 are provided in the upper and lower parts, and the boss hole 7 of the stay bracket 3 and the boss hole 18 of the stay mounting plate portion 9 of the auxiliary wheel are inserted into the hub axle 1 and the stay 4 of the auxiliary wheel is inserted. A large diameter portion 14 and a small diameter that are fixed to the stay bracket 3 so as to be swingable back and forth, and that are adapted to the large diameter portion and the small diameter portion of the saddle hole 8 in the stay bracket 3. The screw portion 15 of the spring-loaded screw 12 having the shaft 17 formed in the axial direction and spring-biased in the retracted position is screwed into the screw hole 11 of the stay mounting plate portion 9 of the auxiliary wheel. To do.
In the present embodiment, the daruma hole 8 is provided in a fan-shaped plate 19 that is attached to the stay bracket 3 with a predetermined gap, and the mounting wall to the stay bracket 3 at the front and rear ends of the fan-shaped plate 19 is auxiliary. It also serves as a restricting tool for the swing range of the stay 4 of the wheel.
The structure of the spring-loaded screw 12 inserted into the daruma hole 8 and screwed into the screw hole 11 of the stay mounting plate portion 9 of the auxiliary wheel is the same as described above, and the description thereof is omitted.
[0010]
Next, when it becomes necessary to adjust the height of the auxiliary wheel 5 with respect to the stay bracket 3, the head 13 of the spring-loaded screw 12 is grasped with a finger as in FIG. The coil spring 16 mounted on the inner peripheral portion of the screw portion 15 is compressed and pulled out so that the small-diameter portion 17 of the shaft faces the position of the dart hole 8 of the stay bracket 3. The portion 17 can clear the small diameter portion of the daruma hole 8 and swing and move to the adjacent large diameter portions before and after.
Thus, it is easy to adjust the height of the auxiliary wheel 5 by relative swinging of the auxiliary wheel 5 with respect to the stay bracket 3 in the front-rear direction.
When the finger is released from the head 13 of the spring-loaded screw 12 at the position where the height and the front-rear position of the auxiliary wheel 5 are optimum, the restoring force of the coil spring 16 causes the same as in FIG. Then, the large diameter portion 14 of the spring-loaded screw 12 is engaged with the optimum large diameter portion of the stay hole 3 of the stay bracket 3 so that the stay 4 is fixed, and a predetermined adjustment height and front and rear position of the auxiliary wheel 5 are obtained.
[0011]
Each embodiment of the present invention has been described above, but within the scope of the present invention, the type of infant car classified by the shape of the frame, the shape of the stay bracket, and its attachment to the hub axle and rear frame Form, shape of stay of auxiliary wheel, related structure of stay bracket and stay of auxiliary wheel, installation form of daruma hole in stay bracket, shape of daruma hole (not limited to circle, oval or square), screw with spring Needless to say, the above-mentioned model, the form of locking between the spring-loaded screw and the daruma hole, etc. can be adopted as appropriate.
[0012]
【The invention's effect】
As described above in detail, according to the present invention, the auxiliary wheel for an infant car configured to attach the stay of the auxiliary wheel via the stay bracket to the rear wheel hub shaft that is pivotally supported by the claws of the rear frame. In the mounting device, the stay of the auxiliary wheel is configured to be slidable in the vertical direction with respect to the stay bracket or to be swingable in the front-rear direction, and selectively engaged with the saddle hole installed in the stay bracket. A special screw or the like is used because a spring-loaded screw having a shaft with a large-diameter portion and a small-diameter portion formed in the axial direction and having a shaft biased to the retracted position is screwed into the stay of the auxiliary wheel. Without pulling the head of the spring-loaded screw with your finger against the biasing force of the built-in coil spring, the small-diameter portion of the shaft of the spring-loaded screw must clear the small-diameter portion of the daruma hole. , Sliding movement of the upper and lower stay auxiliary wheel relative to the stay bracket, or swinging movement back and forth becomes possible, comprising a height or longitudinal position of the auxiliary wheel can be adjusted easily and quickly.
[0013]
During adjustment of the height of the auxiliary wheel, the stay of the auxiliary wheel is not separated from the rear wheel hub shaft that is pivotally supported by the claw bracket of the rear frame together with the stay bracket. The adjustment work can be performed.
In addition, the stay of the auxiliary wheel is not only attached to the rear wheel hub shaft together with the stay bracket, but is also engaged with the dharma hole via a spring-loaded screw in addition to the attachment portion, so that it is supported by so-called two-point support. It will be more firmly attached to the rear wheel hub axle.
As described above, according to the present invention, the height of the auxiliary wheel can be adjusted easily, safely and quickly without requiring a dedicated tool or the like, even for an infant or a woman who is not good at mechanical work. An auxiliary wheel mounting device for an infant car is provided.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of an auxiliary wheel mounting device for an infant car according to the present invention. FIG. 1 (A) is an exploded perspective view of the auxiliary wheel mounting device, and FIG. 1 (B) is a stay of the auxiliary wheel. And FIG. 1C is a partial cross-sectional view of the spring-loaded screw during slide adjustment of the stay of the auxiliary wheel.
FIG. 2 is an exploded perspective view showing a second embodiment of the auxiliary wheel mounting device for an infant car of the present invention.
FIG. 3 is a perspective view of a conventional auxiliary wheel mounting device for infant cars.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hub axle 2 Hub nut 3 Stay bracket 4 Stay 5 Auxiliary wheel 6 Claw metal fitting 7 Boss hole 8 Daruma hole 9 Mounting plate part 10 Long hole 11 Screw hole 12 Screw 13 with spring Head 14 Large diameter part 15 Screw part 16 Coil spring 17 Small diameter portion 17F Flange 18 Boss hole 19 Fan-shaped plate 20 Rear frame

Claims (2)

In the auxiliary wheel mounting device for an infant car configured to attach the stay of the auxiliary wheel to the rear wheel hub shaft that is pivotally supported by the claw bracket of the rear frame via the stay bracket, a boss hole is formed in each of the upper portion and the lower portion of the stay bracket. And a vertical hole arranged in the vertical direction, and a long hole and a screw hole in the upper and lower portions of the mounting plate portion formed in the upper part of the stay of the auxiliary wheel, the boss hole of the stay bracket and the auxiliary wheel Insert the long hole of the stay mounting plate part into the hub axle to fix the auxiliary wheel stay slidable up and down with respect to the stay bracket, and also fit the large diameter part and small diameter part of the dart hole in the stay bracket. A screw portion of a spring-loaded screw having a shaft in which a diameter portion and a small-diameter portion are formed in an axial direction and is spring-biased in a retracted position is connected to a step of the auxiliary wheel. Auxiliary wheel mounting device for infant car, characterized in that screwed into the screw holes of the mounting plate portion. In the auxiliary wheel mounting device for an infant car configured to attach the stay of the auxiliary wheel to the rear wheel hub shaft that is pivotally supported by the claw bracket of the rear frame via the stay bracket, a boss hole is formed in each of the upper portion and the lower portion of the stay bracket. A boss hole and a screw hole are provided in the upper and lower portions of the mounting plate portion formed in the upper portion of the stay of the auxiliary wheel, and the boss hole of the stay bracket and the auxiliary wheel are provided. Insert the boss hole of the stay mounting plate part into the hub axle to fix the stay of the auxiliary wheel to the stay bracket so that it can swing back and forth, and fit the large diameter part and small diameter part of the slack hole in the stay bracket A screw portion of a spring-loaded screw having a shaft in which a large-diameter portion and a small-diameter portion are formed in the axial direction and is spring-biased in a retracted position is provided on the stay of the auxiliary wheel. Auxiliary wheel mounting device for infant car, characterized in that screwed into the threaded hole of the urging plate portion.

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