JPS638255Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a structure for connecting the ribs of a foldable umbrella such as a Western umbrella.

(Prior art) As is well known, the main rib of this type of folding umbrella is
As shown in the figure, the base bone 2e and tip bone 3e are rotatably connected to each other, but if a rivet 31 or the like is used for this connection as shown in the figure, the manufacturing work is very complicated and the manufacturing cost is high. becomes. Also, if the umbrella frame is made of metal, there will be problems with rust, and
This creates a problem that further deteriorates the processing and manufacturing work.

Therefore, in the past, a means described in Japanese Utility Model Publication No. 38-1674 has been developed as a measure to solve the above-mentioned difficulties. That is, in this means, the umbrella rib is made of synthetic resin, one umbrella rib 30 is provided with engagement shafts 9e, 9e, and the other umbrella rib 31 is provided with the shaft portions 9e, 9e. This is means for providing engagement holes 13e, 13e for engagement and support. According to this means, there is an advantage that not only no rust occurs, but also the manufacturing of each umbrella rib and the assembly work thereof are extremely easy.

(Problems to be Solved by the Invention) However, when the conventional means described above is applied to the connection between the base bone and tip bone of the main bone, the following problems occur.

In other words, when this seed rib has an umbrella fabric attached to its upper surface and the umbrella is opened, a very large force in the direction of arrow A acts on the tip of the tip bone 3e, which causes the tip bone to A very large lifting force F is generated on the rear end side of the shaft 3e using the contact position N with the base bone 2e as a fulcrum.

Thus, the base bone 2e and tip bone 3e as shown in FIG.
If the connection between the shaft and the hole is made only by the engagement means between the shaft and the hole, the shaft will easily come out of the hole due to the force F acting on the rear end of the tip bone 3e, and the engagement will be interrupted. When the condition is removed, a fatal problem arises in that the umbrella becomes difficult to use.

In addition, as a solution to this difficulty, it may be possible to devise the engagement structure between the shaft and the hole to strengthen the engagement connection, but in this case, the engagement part may be tampered with. The structure becomes complicated and manufacturability deteriorates.
Moreover, in general, the lifting force F acting on the rear end of the tip bone 3e is considerably larger than the force acting on the tip side of the tip bone 3e due to the lever principle, so in practice, the shaft and hole As long as the above engagement method is adopted, the release of the engagement portion cannot be prevented.

Therefore, in the past, the main rib could not be connected by means of engaging the shaft and the hole, and the complicated riveting work as shown in FIG. 6 had to be performed.

Therefore, the present invention prevents the engagement between the tip bone and base bone from being easily disengaged even when a large upward force is applied to the rear side of the tip bone, making it easy to connect the two bones. Its purpose is to ensure that the process is carried out reliably and appropriately.

(Means for solving the problem) The present invention improves the above-mentioned conventional method by providing a stopper means for preventing the rear side of the distal bone from rising in a manner that does not interfere with the connection between the base bone and the distal bone. It was designed to solve problems.

That is, the gist of the configuration of the present invention is that the engaging shafts 9, 9 are provided on either one side of the tip of the base bone 2 of the main bone 1 made of synthetic resin and the rear end of the tip bone 3; is provided with engagement holes 13, 13 for engaging the engagement shafts 9, 9 in order to connect the base bone 2 and tip bone 3 mutually rotatably. In this structure, a through hole 15 is bored at the distal end of the base bone 2, and a through hole 15 is formed in the lower surface of the rear end side of the other distal bone 3 so that the rear end side of the distal bone 3 is connected to the distal end of the base bone 2. a locking protrusion that is inserted into the through hole 15 of the base bone 2 and abuts and locks on the lower surface of the distal end of the base bone 2 in order to prevent it from rising by using the contact position with the base bone 2 as a fulcrum; 10
It is located at the protruding point.

(Function) Therefore, in the main rib connection structure characterized by the above configuration, the engagement shafts 9, 9 and the engagement holes 13, 1
3, the base bone 2 and tip bone 3 become rotatably connected to each other. Hole 15
By inserting it through the base bone 2, it is possible to avoid the situation where it comes into contact with various parts of the base bone 2 and obstructs the rotational movement of the tip bone 3.

Therefore, when the umbrella fabric is attached to the upper surface side of the base bone 2 and the tip bone 3, a downward pressing force acts on the tip side of the tip bone 3, and the back end side of the tip bone 3 is When a rising force acts as a reaction force, the locking protrusion 10 at the rear end of the tip bone 3 comes into contact with the lower surface of the tip of the base bone 2 while being inserted through the through hole 15. By being
This prevents upward displacement of the rear end of the tip bone 3.

Therefore, the engagement shafts 9, 9 and the engagement holes 13,
13, no unreasonable force is applied to the engagement portions to release these engagement states, and these engagement states are suitably maintained, and the base bone 2 and tip bone 3
This ensures that the connection is properly maintained.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In Fig. 1, reference numeral 1 indicates a main bone consisting of both a base bone 2 and a tip bone 3 made of synthetic resin such as polyacetal.
Steel piano wires 4, 4a for reinforcement are installed inside the tip bone 3 along its longitudinal direction. 5
6 is a small hole drilled in the rear end of the base bone 2, and 6 is the tip bone 3.
The small hole drilled in the dew tip on the tip side of each is shown,
These are for connecting both ends of the main rib 1 to the umbrella's potter's wheel and the umbrella fabric, respectively. 7 is base bone 2
It is a bridge rotatably connected to the lower surface side at a midway position, and a small hole 8 for attachment to the potter's wheel under the umbrella is bored at its lower end. The support bone 7 is connected to the support bone 7 by locking shafts 16, 16 protruding from both sides of its upper end into a substantially keyhole-shaped notch 17 carved in the lower surface of the base bone 2. has been done.

Next, the configuration of the connecting portion between the base bone 2 and the tip bone 3 will be explained with reference to FIG. 2A.
A small cylindrical engagement shaft protrudes from both left and right sides of the rear end, and 10 is provided on the lower surface of the rear end of the tip bone 3 to protrude rearward in the longitudinal direction of the tip bone 3. It shows the protrusion.

Reference numerals 14 and 14 denote protruding edges protruding from both sides of the upper surface of the distal end of the base bone 2, and a recessed groove 11 into which the rear end of the tip bone 3 can be fitted is formed between the protruding edges.
Reference numerals 12, 12 indicate inclined notches carved in the upper edges of the projecting edges 14, 14, and have a substantially triangular shape that becomes narrower toward the bottom. 13, 13 are the inclined notches 12,
12, and the width l of the upper opening of the notch holes 13, 13 is as follows:
In order to be able to press-fit the engaging shafts 9, 9 into the notched holes 13, 13 and to lock and hold the shafts 9, 9 fitted into the notched holes 13, 13, the outer diameter d of the shafts 9 should be The dimensions are also set to be slightly smaller.

Reference numeral 15 denotes a through hole drilled in the horizontal surface of the distal end of the base bone 2, and is formed in a size that allows the protrusion 10 of the tip bone 3 to pass through. Reference numerals 23 and 13 are engagement recesses carved on both rear sides of the tip bone 3, and when the tip bone 3 is rotated so as to be in a straight line with the base bone 2, the base bone 2 will open as shown in Fig. 2 (b). It can be freely engaged with and disengaged from the locking projections 24, 24 provided on both inner surfaces of the projecting edges 14, 14 to engage with the locking projections 24, 24.

The present embodiment has the above-mentioned configuration. First, when using the umbrella, assemble the umbrella by attaching the rear end side of the base bone 2 to the upper potter's wheel 19 on the umbrella, as shown in FIG. The lower end of 7 is attached to a lower potter's wheel 21 that can slide along the umbrella shaft 22, and an umbrella fabric 20 is pasted on the upper surface side of the main rib 1, and the outer periphery of the umbrella fabric 20 is attached to the tip of the tip rib 3. Attach it to the section.

When the umbrella is open, the main rib 1 is largely bent by the tension of the umbrella fabric 20, and a force in the direction of arrow A is applied to the tip rib 3. Further, as shown in FIG. 1B, the tip bone 3 is in a state where the lower surface side of its rear end is in contact with the upper surface position N of the tip of the base bone 2, and further downward rotation is prevented. The pressing force in the direction of the arrow A acts as a force F that lifts the rear end side of the tip bone 3 upward using the N position as a fulcrum.

When the tip bone 3 is rotated so as to be substantially linear with respect to the base bone 2 as shown in FIG. is inserted through the through hole 15 of the base bone 2 and abutted against the lower surface of the base bone 2, so that the rear end of the tip bone is prevented from rising, and as a result, the engagement shaft 9 of the tip bone 3 is prevented from rising. , 9 from the engagement notches 13, 13 of the base bone 2 is completely eliminated, and the umbrella can be used suitably.

In addition, when folding the umbrella, the tip bone 3 may be rotated relative to the base bone 2 as shown in FIG. By setting it in the inserted state, the protruding piece 10
There is no possibility that this will hinder the rotation of the tip bone 3.

In the above embodiment, when the umbrella is closed with the tip bone 3 rotated as much as possible in a straight line with respect to the base bone 2, the engagement between the locking recesses 23, 23 of the tip bone 3 and the base bone 2 is prevented. By mutually engaging the stopper projections 24, 24, the tip bone 3 can be set so as not to shake or inadvertently rotate relative to the base bone 2, making it convenient to handle the umbrella. There are advantages. However, in the present invention, such a means may be provided as necessary, and is not an essential requirement of the present invention.

Further, in the above embodiment, the engagement shaft 9 of the tip bone 3,
Since the notch holes 13, 13 having a predetermined size and shape are used as the locking holes for locking the shafts 9 to the base bone 2, the engagement of the shafts 9, 9 into the notch holes 13, 13 is difficult. It has the advantage of being very easy to work with. However, the type of engagement hole according to the present invention may be either a notched hole or a non-cutted through hole. Furthermore, the engaging shafts 9, 9 and the engaging holes 13, 13 are such that, contrary to the above embodiment, the engaging shafts 9, 9 are on the base bone 2 side.
Furthermore, there is no problem even if the engagement holes 13, 13 are provided on the tip bone 3 side, respectively.

Furthermore, the present invention does not concern the specific shapes and dimensions of the locking protrusion 10 that protrudes from the lower surface of the rear end of the tip bone 3 or the through hole 15 that is drilled at the tip of the base bone 2. The point is that the base bone 3 is inserted through the through hole 15 of the base bone 2 to prevent the rear end side of the tip bone 3 from rising about the abutting position N with the distal end of the base bone 2. It is only necessary that a locking protrusion 10 that abuts and locks on the lower surface of the distal end of the tip bone 3 protrudes from the lower surface of the rear end side of the tip bone 3.

Furthermore, the present invention does not care about the specific type of synthetic resin of the base bone 2 and tip bone 3 or the specific shape and size of each bone, and furthermore, the present invention does not care about the so-called two bones that connect the main bone 1 with two bones. The invention is not limited to those for tiered folding umbrellas, and can of course be applied to, for example, umbrellas whose ribs are folded into three tiers.

In addition, the design of the present invention can be freely changed in the specific configuration of each part within the scope of the present invention.

(Effects of the invention) As described above, the present invention involves inserting a locking protrusion protruding from the rear end of the tip bone into a through hole drilled at the tip of the other base bone. By abutting and locking the lower surface of the tip of the base bone, it is configured to prevent the rear end of the tip bone from rising using the point of contact with the tip of the base bone as a fulcrum when using the umbrella. In order to become
It is possible to suitably prevent undue force from being applied to the engagement portion between the engagement shaft and the engagement hole between the rear end of the tip bone and the tip of the base bone, and the connection between the tip bone and the tip bone can be prevented as in the conventional connection structure. There is no longer any fear that the state of engagement with the base bone will be inadvertently released.

Therefore, according to the present invention, when connecting the base bone and tip bone, the manufacturing work of the main bone can be greatly simplified by using an engaging means that is easy to manufacture by mutual engagement between the engaging shaft and the engaging hole. Not only does it have the advantage of being simple, but the base bone, tip bone, and connecting part have sufficient connection strength during actual use, and it has the special effect of being extremely excellent in terms of both manufacturability and durability. It came to this.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Figure 1A is a plan view of the whole, Figure 1B is a front view of the whole, Figure 2A is an enlarged sectional view taken along line X-X of Figure 1B,
FIG. 2(b) is an enlarged sectional view taken along YY line of FIG. 1(b). FIG. 3 is a partially cutaway front view of the main part in use. FIG. 4 is a front view of the main part with the main bone bent. FIGS. 5 and 6A and 6B are explanatory diagrams showing conventional examples. 1...Main bone, 2...Base bone, 3... Tip bone, 9,9
... Engagement shaft, 10 ... Locking protrusion, 13, 13
...Engagement hole, 15...Through hole.

Claims (1)

[Scope of utility model registration request] The tip of the base bone 2 of the main bone 1 made of synthetic resin and the tip bone 3
Engagement shafts 9, 9 are provided on either side of the rear end, and the engagement shafts 9, 9 are provided on the other side to rotatably connect the base bone 2 and tip bone 3 to each other. This is a connecting structure of the main ribs for a folding umbrella in which engagement holes 13, 13 are provided for engaging the base bones 2, and a through hole 15 is bored at the tip of the base bone 2, and the other side A through hole 15 of the base bone 2 is provided on the lower surface of the rear end of the base bone 3 in order to prevent the rear end side of the base bone 3 from rising using the contact position with the tip of the base bone 2 as a fulcrum. A connecting structure for a main rib for a folding umbrella, characterized in that a locking protrusion 10 is provided in a protruding manner to be inserted through the base bone 2 and abutted on the lower surface of the tip of the base bone 2.