JPH08887Y2 - Lower wheel for multi-stage telescopic umbrella shaft - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of a lower wheel for a multi-stage telescopic umbrella shaft.

[Prior Art] Western umbrellas that can be folded in two or three tiers for the convenience of carrying are widely used today, and the inventor of the present invention has already applied the Japanese patent application 60-030403.
No. 6-116921 and Japanese Utility Model Application No. 63-116921, a four-stage foldable umbrella is disclosed.

In that case, the umbrella shaft is also formed in a nesting manner in three or four stages so that it can be expanded and contracted, but the lowermost stage (the grip handle side is the lower side and the stone side is the upper side. The same applies in this specification). The umbrella shaft is provided in the shape of a hexagonal rod for easy grip.

In that case, the inner surface of the lower wheel was formed in a cylindrical shape with an inner diameter somewhat larger than the circumscribing circle of the hexagonal cross section perpendicular to the lowermost umbrella shaft formed in the hexagonal rod shape, but the inner diameter is the uppermost step. When the lower end of the lower wheel was locked to the upper cistern when the umbrella was opened, the lower wheel was likely to be greatly tilted and unstable.

[Problems to be solved by the invention]

The present invention has been made to solve the above problems, and an object thereof is to provide a stable opening in a lower wheel for a multi-stage telescopic umbrella shaft in which the lowermost umbrella shaft is formed in a hexagonal rod shape. It is to provide a lower wheel that can keep the umbrella state.

[Means for solving problems]

The above object can be achieved by forming the inner surface of the lower wheel into a hexagonal hole through which the lowermost umbrella shaft can be inserted.

By forming a step on one side of the hexagonal hole at the lower end of the lower wheel, the lower wheel can be locked more stably with respect to the upper crater.

[Action]

With the lower rocker having the above-described structure, the inner diameter of the hexagonal hole is substantially the same as the inscribed circle, which is smaller than the conventional cylindrical shape, so the inclination of the lower rocker when the umbrella is opened is small. In addition, since it is possible to engage with the upper repellent in the narrow portion between the two opposite sides, it is possible to maintain a stable open state [Example] Hereinafter, the details of the present invention will be described with reference to the drawings. Explained.

FIG. 1 is a perspective view showing a state in which a lower rocker for a multi-stage telescopic umbrella shaft according to the present invention is locked to an upper crater when the umbrella is opened, FIG. 2 is a bottom view of the lower rocker according to the present invention, and FIG. FIG. 4 is a cross-sectional view showing another embodiment of the lower rocker for a multi-stage telescopic umbrella shaft according to the present invention, which is locked to the upper repellent when the umbrella is opened, and FIG. 4 is a perspective view of the lower rocker shown in FIG. FIG. 5 is a side view showing a state in which the lower rocker for a known multi-stage telescopic umbrella shaft is locked to the upper cistern when opening the umbrella, FIG. 6 is a perspective view thereof, and FIG. 7 is a sectional view thereof. .

Thus, as shown in FIGS. 1, 5 and 6, the multi-stage retractable umbrella shaft connects the upper stage umbrella shaft 1, the middle stage umbrella shafts 2 and 3, and the lower stage umbrella shaft 4 so as to be telescopically expandable. The lower umbrella shaft 4 is formed in a hollow hexagonal rod shape so that the umbrella can be easily held when the umbrella is opened.

The typical dimensions of this umbrella shaft are as follows. (Unit: mm) (See Fig. 6) Therefore, as shown in FIG. 6, the inner surface of the lower wheel 5 is formed into a cylindrical shape as in the conventional case, and its inner diameter is set to 13.0 mm so that it can be inserted into the outer circumference of the lower umbrella shaft 4. Also, upper blazing 6
The protruding height of the upper edge 61 of the above from the umbrella shaft is 6.6 mm.

If that is the case, upper repellent 6 lower roll 5 when the umbrella is opened
The amount of catching on the lower end surface of the is (7.6 + 6.6) -13.0
= 1.2 mm, which is relatively short, and the inner diameter of the lower wheel 5 is 1
Since 3.0 mm is considerably larger than the outer diameter of the upper umbrella shaft 1 of 7.6 mm, the lower wheel 5 tilts as shown in FIG. 5, and further,
Since the lower edge of the lower wheel 5 is rounded 52 as shown in FIG. 7 so as to make the movement on the umbrella shaft smooth, the locking by the upper repelling 6 becomes very unstable.

Therefore, the lower wheel 5 according to the present invention is shown in FIGS.
As shown in FIG. 5, the inner surface of the hexagonal hole 51 is set to 11.8 so that the hexagonal hole 51 can be inserted into the outer circumference of the lower umbrella shaft 4.
mm, and the distance between two opposite vertices is 13.0 mm. The protruding height of the upper repellent 6 to the outside of the umbrella shaft is 6.6 mm as in the conventional case.

If that is the case, upper repellent 6 lower roll 5 when the umbrella is opened
The amount of catching on the lower end surface of the is (7.6 + 6.6) -11.8
= 2.4 mm, which is about twice as long as the conventional one.

Moreover, since the substantial inner diameter of the inner surface of the lower roller 5 which is in contact with the outer surface of the upper umbrella shaft 1 is equal to 11.8 mm which is the distance between the two opposite sides of the hexagonal hole 51, the inclination of the lower roller 5 when the umbrella is opened is reduced. Therefore, a stable open state can be secured.

Therefore, it is necessary to add the roundness 52 to the inner edge of the lower end of the lower wheel 5 in order to make the movement on the umbrella shaft smooth as in the conventional case, but even in that case, the upper edge 61 of the upper reticle 6 ensures stable locking. In order to secure the state, in the lower wheel according to the present invention, preferably, as shown in FIGS. 3 and 4, a notch 53 (see FIG. 4) on one side of the lower edge of the hexagonal hole 51.
Is provided, and it is recommended that the step 54 (see FIG. 3) be formed on the inner surface of the hexagonal hole 51. By doing so, the tip of the upper edge 61 of the upper cistern 6 is firmly locked to the step 54, and a stable open state is maintained.

Generally, the depth K of the notch 53 is about 1 to 2 mm, and the axial length G is about 3 to 7 mm.
In order to secure the thickness of the pipe wall, a projection 55 is formed on the outer wall of the lower wheel 5 as shown in FIG.

[Effect of device]

Since the present invention is configured as described above, according to the present invention, it is possible to provide a lower wheel which can maintain a stable open state in a multi-stage retractable umbrella shaft.

It should be noted that the configuration of the present invention is not limited to the above-described embodiments, and the present invention includes all modifications within the scope of its purpose that a person skilled in the art can easily conceive from the above description and the known art. It embraces the examples.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a lower rocker for a multi-stage telescopic umbrella shaft according to the present invention is locked to an upper crater when the umbrella is opened, FIG. 2 is a bottom view of the lower rocker according to the present invention, and FIG. FIG. 4 is a cross-sectional view showing another embodiment of the lower rocker for a multi-stage telescopic umbrella shaft according to the present invention, which is locked to the upper repellent when the umbrella is opened, and FIG. 4 is a perspective view of the lower rocker shown in FIG. FIG. 5 is a side view showing a state in which the lower rocker for a known multi-stage telescopic umbrella shaft is locked to the upper cistern when opening the umbrella, FIG. 6 is a perspective view thereof, and FIG. 7 is a sectional view thereof. . 1 …… Upper umbrella shaft 2,3 …… Middle umbrella shaft 4 …… Lower umbrella shaft 5 …… Lower wheel 6 …… Upper cistern

Claims (2)

[Scope of utility model registration request] 1. An outer shape of at least the lowermost umbrella shaft (4) is formed into a hexagonal rod shape, and when the umbrella is opened, the lower wheel (5) is engaged by an upper reticle (6) provided on the uppermost umbrella shaft (1). In the lower roller (5) for a multi-stage telescopic umbrella shaft configured to be stopped, the lower roller (5) has an inner surface shape of a hexagonal hole (51) into which the lowermost umbrella shaft (4) can be inserted. ). 2. The lower rocker according to claim 1, wherein a step (54) is formed on one side of a hexagonal hole at the lower end of the lower rocker locked by the upper cistern (6) when the umbrella is opened.