JPH0327457Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of use Western umbrellas are usually equipped with a lower potter's wheel, which is slidably provided on the umbrella handle and can be slid up and down to open and close the umbrella, and the lower wheel is placed on the handle to open and close the umbrella. A locking device that locks the umbrella so that it cannot move downward at the top to maintain the open state and another locking device that locks the umbrella so that it cannot move upward and maintain the closed state when the umbrella is closed. Generally speaking, two types of locking devices are provided, called an upper hatchet and a lower hatchet. To open the umbrella from a closed state, the lower potter's wheel must be unlocked by the lower hatchet, and then the lower potter's wheel should be opened. The umbrella is opened by pushing it up on the umbrella handle, and to close the umbrella from the open state, the lower potter's wheel is unlocked by the upper repellent, and then the lower potter's wheel is pulled down on the umbrella handle to close the umbrella. However, this invention relates to a Western umbrella in which both the upper and lower hajiki as described above are eliminated.

Prior Art Such a Western umbrella is already known from Japanese Utility Model Application Publication No. 58-70120 filed by the present applicant, and is provided within the umbrella handle so as to protrude outside the umbrella handle through a window hole in the umbrella handle. Since two hajiki were missing,
Not only is the structure simple and durable, but since the repellent is not operated when the umbrella is opened or closed, it is safe and suitable for use by children.

By the way, the above-mentioned known western umbrella has a supporting rib stretched between the main rib whose base end is pivoted to the upper potter's wheel fixed to the upper end of the umbrella handle, and the lower potter's wheel which is slidably provided on the umbrella handle. When the western umbrella is open, it takes an upward tilted position from the main rib to the umbrella handle.
In addition to setting the upper limit of sliding position of the lower potter's wheel on the umbrella handle, the spring acts in the direction of reducing the included angle between the tip side of the main rib and the support bone.
It is configured to be installed between the tip side of the main rib and the support bone, and when the umbrella is in the closed state, the lower potter's wheel slides downward on the umbrella handle to maintain the closed state and prevent the lower repellent. Utilizing the fact that the spring slides and urges the lower potter's wheel upward on the umbrella handle through the bridge after the bridge assumes a horizontal position when the umbrella is opened, The upper repellent is omitted because the open state is maintained by a spring.

However, the above-mentioned upward inclination posture given to the bridge when the umbrella is open cannot be set to be very large, since the bridge supports the main rib when the umbrella is open and the umbrella cloth stretched thereon. For this reason, there were cases in which the umbrella could not be reliably maintained in the open position due to manufacturing errors or loss of tension in the umbrella cloth (due to repeated use or exposure to water).

The idea was to use a spring that forces the lower potter's wheel to slide downward on the umbrella handle when the umbrella is closed, thereby eliminating the need for lower repelling. A new Western umbrella is equipped with a spring that slides upward on the handle and biases the lower potter's wheel upwards from an early stage when the umbrella is opened. , which we intend to provide.

Problem Solving Means In order to solve the above-mentioned problems, this invention, as illustrated in FIG. and a lower potter's wheel 4 that is slidably provided on the umbrella handle 1, and a supporter 5 that is pivotally connected at one end and the other end to the supporter end pivot point A ₁ of the main rib 3. A tension spring 6 is placed between a point A ₂ and a point B ₂ on the lower side of the support pivot point B ₁ on the lower potter's wheel 4 by upward movement of the lower potter's wheel 4 on the umbrella handle 1. From the lower potter's wheel 4 position where the opening degree β ₁ of the strut 5 that is increased relative to The distance between the bridge end pivot point A ₁ and the spring attachment point A ₂ on the main rib 3 is made relatively small, and the distance between the bridge end pivot point B ₁ and the spring attachment point B ₂ on the lower potter's wheel 4 is compared. Technical measures were taken, such as setting and setting large targets.

In other words, FIG. 1 shows the tension spring 6 when the umbrella is opened.
marks the lower wheel 4 position where the lower wheel 4 starts to slide upward, but at this time, the opening angle β ₁ is smaller than 90 degrees by an appropriate amount, and from this lower wheel 4 position Until the lower wheel 4 reaches the highest position shown in the figure, that is, the umbrella is opened, the tension spring 6 slides and urges the lower wheel 4 upward, so that the lower wheel 4 is moved upward from an early stage when the umbrella is opened. The tension spring 6 biases the second
It was decided to ensure that the open state shown in the figure is maintained.

When a tension spring is installed between the main rib 3 and the lower potter's wheel 4, common sense suggests that the spring will always act in the closing direction. On the other hand, as a result of research, the inventor of the present application found that it is possible to provide a tension spring so that the biasing direction can be reversed from a certain position of the lower wheel 4 on the umbrella handle 1, and has completed the present invention. The principle of the present invention is explained as follows.

Figure 5 schematically shows a state in which the lower potter's wheel 4 is positioned at a certain position on the umbrella handle 1, the lower potter's wheel 4 is not shown and only the two points B ₁ and B ₂ above it are shown. The two points A ₁ and A ₂ on the main rib 3 are also shown. The pivot point of the main rib 3 to the upper potter's wheel 2 is C
and the same pivot point C and each of the above points A ₁ on the main rib 3,
Let the distance between A ₂ be l ₁ and l ₂ as shown in the figure.

If the tension of the tension spring 6 is F in the state shown in _FIG . 4, it acts diagonally upward at point _B2 . The force of the spring 6 also acts on the strut 5 at point _A1 , and if the force acting on the same point _A1 is Fa as shown in the figure, a similar force Fa is applied to the lower wheel at point _B1 through the strut 5. 4, it is made to act diagonally downward in the direction along the strut 5.

As is clear from Fig. 5, among the forces F and Fa acting on the lower wheel 4, the force Fa is the component force Fl that urges the lower wheel 4 to slide downward, and the force F is the component force Fl that urges the lower wheel 4 upward. If ∠CB ₁ A ₁ is β ₁ and ∠CB ₂ A ₂ is β ₂ , the component forces Fl and Fu are as follows.

Fl=Fa・cosβ ₁ …(1) Fu=F・cosβ ₂ …(2) Also, assuming that ∠CA ₁ B ₁ is α ₁ and ∠CA ₂ B ₂ is α ₂ , the forces Fa and F on the side of the main bone 3 are Component force in the direction perpendicular to 3
Calculating F ₁ and F ₂ is as follows.

F ₁ = Fa・sinα ₁ …(3) F ₂ =F・sinα ₂ …(4) And the moment that tries to rotate the main rib 3 around point C is whether viewed from point A ₁ or point A ₂ . Equally, the relationship l ₁・F ₁ = l ₂・F ₂ …(5) holds, so by substituting equations (3) and (4) into this equation (5), l ₁・Fa・sinα ₁ =l ₂・F・sinα ₂ (6) is obtained, and the force Fa is calculated from this equation (6) as follows.

Fa=F・l ₂ /l ₁・sinα ₂ /sinα ₁ …(7) Then, by substituting the force Fa expressed by equation (7) into equation (1), the force that urges the lower potter's wheel 4 downward is obtained. Fl is given by the following formula.

Fl=F・l ₂ /l ₁・sinα ₂ /sinα ₁・cosβ ₁ …(8) Therefore, the force that tries to lower the lower wheel 4
The ratio between Fl and the force Fu to raise is calculated by formula (8) and formula
From (2), Fl／Fu＝l ₂ /l ₁・sinα ₂ /sinα ₁・cosβ ₁ /cosβ ₂ …
(9) If the ratio expressed by this equation (9) is greater than 1, the lower wheel 4 will descend, and if it is smaller than 1, the lower wheel 4 will rise.

In Figure 6, the distance between points A ₁ and A ₂ is relatively small,
For a Western umbrella with a relatively large interval between points B ₁ and B ₂ , the progression order of opening is shown in brackets.
The relationship between the position of the lower potter's wheel 4 indicated by points B ₁ and B ₂ and the postures of the main rib 3, brace 5, and spring 6 is plotted. In the western umbrella shown in Fig. 6, the distance l ₂ shown in Fig. 5 and
The ratio with l ₁ is approximately 1.046 (l ₂ /l ₁ ≈1.046).
As the umbrella unfolds, the opening degree θ of the main rib 3 changes from θ ₁ →θ ₂ →θ ₃
It increases as →θ ₄ →θ ₅ .

In FIG. 7, the angles α ₁ , α ₂ , β ₁ , β ₂ shown in FIG. 5 were actually measured by drawing as shown in FIG. 6, and l ₂ /l ₁
= 1.046 and the measured angle are substituted into the above equation (9) and the ratio is
Calculate Fl/Fu and the ratio to the opening angle θ of the main rib 3
This is a plot of the Fl/Fu relationship. The angle β ₁ , which is the opening angle of the strut 5, is marked at each plot point.

As is clear from FIG. 7, in the Western umbrella shown in FIG. 6, not only does the ratio Fl/Fu decrease as the umbrella opens, but the opening angle β ₁ of the struts 5 reaches approximately 60 degrees. When this point is reached, the urging direction of the lower wheel 4 of the spring 6 is reversed, and the lower wheel 4 is urged upward. In reality, there is resistance between the lower potter's wheel 4 and the umbrella handle 1, and the opening angle _β1 at which the lower potter's wheel 4 actually starts to rise automatically upon receiving an upward force is approximately 70 degrees, for example.

Next, Fig. 8 shows the progress of opening of an umbrella in which the interval between points A ₁ and A ₂ is set relatively large and the interval between points B ₁ and B ₂ is set relatively small, using the same method as in Fig. 6. It was drawn by. Regarding such a western umbrella, the ratio Fl/Fu is similar to that explained with reference to FIG.
When calculated, the direction in which the lower wheel is biased by the spring 6 does not reverse until the opening angle β ₁ of the strut 5 reaches 90 degrees.

If we consider the difference between the western umbrella in Fig. 6 and the western umbrella in Fig. 8 using the above equation (9), we can now calculate the distance between points A ₁ and A ₂ by δl as shown in Fig. 5. _a , the interval between points B ₁ and B ₂ is δl _b , then the first term on the right side of equation (9)
Even though _the relationship between l ₂ and l ₁ is _{l 2 >} l ₁ (10) and l ₂ / l ₁ > (11), l 2 /l 1 becomes smaller as δl _a becomes smaller. Next, looking at the relationship between the progress of the umbrella opening and the angles α ₁ , α ₂ , β ₁ , β ₂ , it can be seen that the angles α ₁ and α ₂ are the angles between the main rib 3 and the strut 5 or spring 6. Even if the opening angle θ of the main rib 3 approaches the fully opened state, it will only decrease to a certain value, whereas the angles β ₁ and β ₂ can approach 90 degrees without limit (eventually, 90 degrees). (It can go too far.) Therefore, as the opening progresses, sinα ₁ ,
The rate of change of cosβ _{1 and} cosβ ₂ is greater than the rate of change of sinα 2 (the rate of change of the cosine value increases as the angle approaches 90 degrees). Therefore, as the opening progresses, equation (9)
To make the third term cosβ ₁ /cosβ ₂ on _the right side of The difference between _{the two} should be increased.
The condition for increasing the difference between angles β ₁ and β ₂ is the fifth
As is clear from the figure, δl _a is set relatively small and δl _b is set relatively large.

In this way, if δl _a is set relatively small and sl _b is set relatively large, when the opening angle β ₁ of the strut 5 takes a value much smaller than 90 degrees, the direction in which the lower potter's wheel 4 is energized by the spring 6 can be adjusted. can be reversed, and the present invention is based on this principle.

Embodiment An embodiment is shown in FIGS. 1-4 and has the construction as described above with respect to FIG.

In Fig. 1-4, 7 is a wire for pivotally connecting the 3 ends of the main rib to the upper potter's wheel 2, 8 is a wire for pivotally connecting the 5 end of the support bone to the lower potter's wheel 4, and 9 is a wire for pivotally connecting the 3 ends of the main rib to the upper potter's wheel 2. A metal joint 10 is a handle fixed to the lower end of the umbrella handle ₁ , which is caulked and used for pivotally connecting the 5 ends of the bridges to the main ribs 3 through the eyelets at the point A1.

In the illustrated case, the tension spring 6 is made of a bullet with only approximately half of the spring on the side of the main rib 3 serving as a coil spring portion. In order to connect one end of the spring 6 to the main rib 3, a latch 11 is caulked onto the main rib 3 at the distal end side of the joint hardware 9, and a hook formed at one end of the spring 6 is inserted through the latch 11. It is hooked into the hole. Place the other end of the spring 6 on the lower wheel 4.
In order to connect to the spring 6, a wire 12 is used which is inserted through an annular curve formed at the other end of the spring 6 and wound around the lower wheel 4. Spring 6
may be stretched between all the main ribs 3 and the lower potter's wheel 4, or some of the main ribs 3, for example, every other main rib 3.
and the lower potter's wheel 4.

In order to regulate the upper limit position of the lower potter's wheel 4 on the umbrella handle 1, a downward-facing cylindrical portion 2 formed on the upper potter's wheel 2 is required.
The lower potter's wheel 4 is formed with an upwardly directed cylindrical portion 4a that comes into contact with the lower potter's wheel 4 and restricts the upward movement of the lower potter's wheel 4. In the illustrated case, as shown in FIG. 2, the upper limit position of the lower potter's wheel 4 is set at a position that makes the opening angle β ₁ of the strut 5 slightly larger than 90 degrees.

Neither the upper repellent nor the lower repellent that is provided on a regular Western umbrella is provided.

The western umbrella shown in FIGS. 1-4 is opened from the closed state shown in FIG. 3 by holding the handle 10 with one hand and pushing up the lower wheel 4 on the umbrella handle 1 with the other hand. As the umbrella 4 is pushed up, the opened state shown in FIG. 2 is obtained after passing through the states shown in FIGS. 4 and 1. The opening operation force, that is, the force required to push up the lower wheel 4, is reduced as the lower wheel 4 is pushed up, as the downward biasing force of the lower wheel 4 is reduced by the spring 6, and from the state shown in FIG. Conversely, the lower wheel 4 is automatically slid upward by the spring 6.

In the open state shown in FIG. 2, the lower wheel 4 is slid upward from an early stage when the umbrella is opened, and then the spring 6 increases the upward force as the lower wheel 4 moves upward. maintained.

In the case shown, the opening angle β ₁ of the strut 5 is set to be slightly larger than 90 degrees as described above in the open state shown in FIG. It will be explained with reference to FIG. 9 that the spring 6 urges the lower wheel 4 upward even in the open state. As shown in FIG. 9, when the opening angle β ₁ is larger than 90 degrees, the force Fa exerted on the strut 5 via the main rib 3 by the tension F of the spring 6 is
It is not applied as a descending force but as an upward force Fu', and is expressed by the following equation (12).

Fu′=−Fa・cosβ ₁ …(12) Therefore, if the above angle β ₂ is smaller than 90 degrees, the upward force Fu expressed by the above formula (2) and the upward force expressed by the above formula (12) If the lower potter's wheel 4 is urged upward by the force added to the force Fu′, and the angle β ₂ is 90 degrees and the upward acting force Fu expressed by equation (2) is 0, then equation (12) is obtained. The lower potter's wheel 4 is urged upward by the upward force Fu' expressed. If the angle β ₂ is greater than 90 degrees, the force directly acting on the lower wheel 4 from the spring 6 will be a downward force, but if this downward force is Fl', then Fl' = -F・cosβ ₂ ...(13) From equations (12) and (13), the upward force Fu'' acting on the lower wheel 4 is Fu''=-(Fa・cosβ ₁ −F・cosβ ₂ )...(14) Become. In this equation (14), as is clear from the above equation (6), Fa is larger than F, and since β ₁ > β ₂ > 90° ...(15), |cosβ ₁ |> |cosβ ₂ | ...(16) Therefore, in the end, Fu''>0 ...(17), and the lower potter's wheel 4 is energized in the upward direction.

When closing the umbrella shown in FIGS. 1-4 by pulling down the lower potter's wheel 4 on the umbrella handle 1 from the open state shown in FIG. 2, the spring 6 Since the lower potter's wheel 4 is energized downward, the umbrella closing automatically progresses, and the umbrella closing state shown in FIG. 3 is obtained after passing through the state shown in FIG. 4. This closed state is reliably maintained by the spring 6 which urges the lower potter's wheel 4 downwards from the middle of the closing process and then increases the biasing force afterward. Even if you carry it in an inverted position, the umbrella ribs will not expand.

Effects of the invention As previously analyzed and explained, the tension spring 6 provided in the present umbrella with the above-mentioned structure is located at the lower wheel 4 position on the umbrella handle 1, which reverses the direction of the biasing action on the lower wheel 4. The lower the lower wheel 4 is located on the umbrella handle 1, the lower the lower wheel's downward urging force is increased, and the higher it is located, the lower wheel's upward force is increased. The present invention uses such a spring 6 to urge the lower potter's wheel 4 upward from an early stage when the umbrella is opened, so that the lower potter's wheel 4 is urged upward on the umbrella handle 1. 4 position range (in the example, the range between the lower potter's wheel 4 position in Figure 1 and the lower wheel wheel 4 position in Figure 2) can be set widely, and the manufacturing error of the Western umbrella can be sufficiently reduced over such a wide position range. Can be absorbed.

Therefore, when a repeatedly used Western umbrella is opened in the rain and the tension of the umbrella fabric cannot be expected to maintain the umbrella in the open position at all, the lower potter's wheel 4 may move slightly downward due to the wind pressure under strong winds. Even if such a situation occurs, the western umbrella will not close as it is because the lower potter's wheel 4 is within the range of receiving the upward force, and the open state will be maintained reliably. .

There is no need to explain that the closed state of the western umbrella under the present invention is definitely maintained.

Therefore, according to the present invention, there is provided a western umbrella that can reliably maintain the open and closed states while eliminating the upper and lower repellents.

[Brief explanation of drawings]

Figures 1, 2, 3, and 4 are partially longitudinally sectional schematic front views of one embodiment of this invention in different states, and only one set of umbrella ribs is shown. Other sets of umbrella ribs are not shown. Fifth
Fig. 6 is a schematic diagram of a western umbrella for explaining the principle of this invention, Fig. 7 is a schematic graph for the same purpose, and Fig. 8 is a schematic diagram of a western umbrella for the same purpose. be. FIG. 9 is a schematic diagram of an umbrella for explaining one effect of the above embodiment. 1...umbrella handle, 2...upper potter's wheel, 3...main rib, 4
... lower potter's wheel, 5 ... bridge, 6 ... tension spring, 11 ... latch, 12 ... wire.

Claims (1)

[Scope of utility model registration request] The main rib is pivotally supported on an upper potter's wheel fixed to the upper end of the umbrella handle, and a bridge is provided that is pivoted at one end and the other end on the middle of this main bone and a lower potter's wheel that is slidably provided on the umbrella handle. In a Western umbrella, a tension spring is placed between a point on the tip of the outer rib on the tip side of the pivot point on the outer rib and a point on the lower potter's wheel on the lower side of the pivot point on the lower potter's wheel. From a lower potter's wheel position where the opening angle of the bridge increased relative to the lower potter's wheel by movement is smaller than 90 degrees, the direction of the biasing action on the lower potter's wheel is reversed, and the lower potter's wheel is slidably biased upward; The feature is that the distance between the support bone end pivot point and the spring attachment point on the main bone is set relatively small, and the distance between the support bone end pivot point and the spring attachment point on the lower potter's wheel is set relatively large. Western umbrella.