JPH027682Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a caster wheel with a cap, in which a cap is fitted on the outside of the wheel.

(Prior art) A conventional structure for attaching a cap to a caster wheel is shown in Utility Model Application Publication No. 1703/1983, in which a plurality of insertion holes are provided around the wheel and the cap is inserted into the holes. A plurality of legs to be attached to the cap are integrally formed on the outer peripheral edge of the inner surface of the cap, and the protrusions at the tips of the legs are fixed by snap-locking into the stepped part of the recess inside the small insertion hole.

However, the above-mentioned cap mounting structure has a drawback that the cap easily comes off if an excessive force is applied to the caster or if another object hits the cap, since it is simply a bullet lock.

(Purpose of the invention) The object of this invention is to provide a caster wheel with a cap that has an extremely simple structure, but which does not come off even if any external force is applied once the cap is fitted onto the wheel.

(Structure of the invention) The invention consists of a boss part 3a at the center and a ring body 3 at the outer periphery.
b, and a disc 3c connecting the boss portion and the ring body.
In the wheel, a plurality of insertion holes 7 having an inverted convex shape having an outer wide part 7a and an inner narrow part 7b are provided near the outer periphery of the disk, and a wheel body inside each of these insertion holes is provided. A protrusion deflection guide 8 is provided on the circumferential surface of the wheel and protrudes in the axial direction toward the inside of the wheel, and a plurality of protrusions corresponding to the insertion holes are provided on the inner and outer periphery of the synthetic resin cap 5 that is attached to the wheel. 9 is established,
The tip of each of these protrusions is a wide tip wide portion 9a.
In this case, the width of the intermediate portion 9b is made narrower, and the width of the wide end portion is smaller than the outer wide portion 7a of the insertion hole.
b, and the width of the intermediate portion 9b of the protrusion is smaller than the narrow inner width portion 7b, so that when each protrusion 9 of the cap is inserted into the corresponding insertion hole 7, the wide portion 9a at the tip of the protrusion becomes a protrusion. The caster wheel with a cap is characterized in that the cap is fixed to the wheel by pressing and changing the direction in the axial direction by a direction guide 8 and engaging the tip of the projection with the narrow part 7b of the insertion hole.

(Effects of the invention) According to this invention, when attaching the cap to the wheel, if each protrusion of the cap is pushed in so as to correspond to the insertion hole, the tip of the protrusion is guided to the protrusion deflection guide on the circumferential surface of the wheel body. When the wide end of the protrusion completely enters the outer wide part of the insertion hole, the narrow part in the middle of the protrusion enters the narrow part of the insertion hole, and the wide end of the protrusion enters the narrow part of the insertion hole. The stepped portion of the cap and the stepped portion of the insertion hole engage to completely lock the cap to the wheel.

Therefore, once the cap is fitted onto the wheel, the cap will not come off the wheel no matter how much external force is applied, and the cap can be completely fitted and fixed.

(Example) An example of the present invention will be described in detail below based on the drawings.

The drawing shows a caster wheel with a cap, and the first
In the figure, in a caster 1 made of synthetic resin,
Reference numeral 2 denotes a cover, and this cover 2 is formed in a semicircle to cover the upper outer periphery of the wheels 3, 3 on both sides. A support shaft 4 is rotatably fitted into the upper part of one side of the cover 2, and caps 5, 5 made of synthetic resin that can be pressed and deformed are fitted onto the outsides of the wheels 3, 3.

As shown in the cross-sectional view of FIG. 2, the cover 2 has a supporting wall 2a integrally connected to it at the middle lower part in the width direction.
A through hole 2b is formed in this support wall 2a, and a wheel 6 is inserted into the through hole 2b, and a boss portion 3a of the wheel 3 is rotatably fitted into both ends of the axle 6.

The wheel 3 is integrally formed with a boss portion 3a at the center, a wheel body 3b at the outer periphery, and a disc 3c connecting these two parts 3a and 3b, and the outer face of the disc 3c is the outer end of the wheel body 3b. The cap 5 is set one step lower than the cap 5 to provide an insertion allowance for the cap 5.

As shown in FIG. 3, a plurality of inversely convex insertion holes 7, 7... having a wide outer width part 7a and a narrow inner width part 7b are provided on the outer circumference of the disc 3c, and each of these insertion holes 7, 7... The holes 7, 7... are integrally formed on the inner circumferential surface of the inner wheel body 3b with projection deflection guides 8, 8, which have a wedge-shaped cross section and project in the axial direction as far as the inside of the wheel 3.

The cap 5 attached to the wheel 3 is shown in Figs. 4 and 5.
As shown in the figure, the insertion holes 7, 7 are provided on the inner and outer periphery.
A plurality of protrusions 9, 9... are integrally protruded in correspondence with..., and the tip of each of these protrusions 9, 9... is formed into a wide tip portion, and the intermediate portion 9b is made narrow. , the width of the wide tip portion 9a is smaller than the outer wide portion 7a of the insertion hole 7 and larger than the inner narrow portion 7b, and the width of the intermediate portion 7b is smaller than the width of the inner narrow portion 7b of the insertion hole. It is formed to a size that can fit inside.

Next, to explain how to attach the cap 5 to the wheel 3, as shown in FIG. 5A, the protrusions 9, 9... of the cap 5 are inserted into the holes 7, 7...
When pressed as shown in figure B, the ring body 3
b The projections 9, 9, . . . are inserted while being gradually bent in the axial direction by the wedge-shaped projection deflection guides 8, 8, .

When the wide tip portion 9a is completely inserted into the insertion hole 7, the wide tip portion 9a is completely inserted into the insertion hole 7, as shown in FIG.
The stepped portion 9c between the intermediate portion 9b and the insert hole 7 engages with both side walls of the narrow inner width portion 7b of the insertion hole 7, and is completely locked and cannot be pulled out at all.

In this way, once the cap 5 is fitted,
By pushing the projection 9 in the axial direction by the wedge-shaped projection deflection guide 8 and locking it by the engagement between the step 9c of the wide end 9a and the side wall 7b of the insertion hole 7, no external force is applied. It is also possible to obtain a caster wheel with a cap from which the cap 5 does not come off.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a perspective view of a caster wheel with a cap, Fig. 2 is a vertical sectional view with the cap removed, and Fig. 3 is a front view of the wheel before the cap is attached. , FIG. 4 is a rear view of the cap, FIGS. 5A to 5C are explanatory diagrams showing the process of attaching the cap to the wheel, FIG. 6 is an enlarged view showing the fitted state of the cap, and FIG. FIG. 3 is a longitudinal cross-sectional view of the wheel with the cap attached. 3...wheel, 3a...boss part, 3b...wheel body,
3c... Disc, 5... Cap, 7... Insertion hole,
7a...Wide part, 7b...Narrow width part, 8...Protrusion direction change guide, 9...Protrusion, 9a...Tip wide part, 9
b...middle part.

Claims (1)

[Claims for Utility Model Registration] A wheel comprising a boss portion 3a at the center, a wheel body 3b at the outer periphery, and a disk 3c connecting the boss portion and the wheel body, in the vicinity of the outer circumference of the disk. A plurality of insertion holes 7 having an inversely convex shape having a wide outer width portion 7a and a narrow inner width portion 7b are provided, and the inner peripheral surface of the wheel body inside each of these insertion holes protrudes in the axial direction toward the inner side of the wheel. In addition to providing a protrusion deflection guide 8, a plurality of protrusions 9 are provided on the inner and outer periphery of the synthetic resin cap 5 that is attached to the wheel, corresponding to the insertion holes, and the tip of each of these protrusions is connected to a wide tip. Wide part 9a
In this case, the width of the intermediate portion 9b is made narrower, and the width of the wide end portion is smaller than the outer wide portion 7a of the insertion hole.
b, and the width of the intermediate portion 9b of the protrusion is smaller than the narrow inner width portion 7b, so that when each protrusion 9 of the cap is inserted into the corresponding insertion hole 7, the wide portion 9a at the tip of the protrusion becomes a protrusion. Direction guide 8
A caster wheel with a cap in which the cap is fixed to the wheel by pressing the cap in the axial direction and engaging the tip of the protrusion with the narrow part 7b of the insertion hole.