JP3182953U - Suction hook without vacuum chamber - Google Patents

Abstract

The present invention provides a hanging device provided with a hook that reduces the bulkiness of a suction body, ensures a high degree of freedom of the hook shape and high designability, and improves the holding force and holding time.
A flexible thin film 1 without a vacuum chamber is used as a suction body, and a thin plate 2 provided with a hook 3 is attached to the thin film. Since the device is thin and has a sufficient holding performance with a simple structure, the shape can be freely selected.
[Selection] Figure 1

Description

  The present invention relates to a detachable and long-lasting sustainable hook.

The hooks are necessary for suspending an object, and are small instruments that are always used in each home. The mounting method differs depending on the wall material. For wood, it is generally fixed with nails or wood screws. For iron plates, it is generally fixed by suction with a magnet. For glass or plastic, it is generally fixed with a vacuum suction rubber device or adhesive. Of these, the hook that can be detached without damaging the wall is an instrument using a magnet and vacuum suction. Choose a material for the magnet hook and a smooth surface for the suction rubber hook.
In recent years, materials for walls have also diversified, and materials such as non-ferrous metals, plastics, and glass have come to be used. The range of use of suction rubber hooks is expanding.

  However, the suction rubber hook is bulky in order to secure a vacuum chamber, and there is a disadvantage that flexibility in shape and design is lost. Furthermore, the bulkiness also caused a decrease in holding power and holding duration.

  There was also a device to deaerate the vacuum chamber to increase the degree of vacuum, but the effect of improving the holding power and the effect of improving the holding time were not expected. Rather, the adverse effect of making the instrument large and complex and narrowing the conditions of use was greater. In particular, the downside of limiting design was significant.

  In addition, a device intended to be used on a curved surface using a flexible sponge-like material hole as a vacuum chamber has been devised, but it has not been put into practical use because the concept of providing a vacuum chamber has not been made.

JP 2008-173222 A

  The problems to be solved are the bulkiness of the hook due to the presence of the vacuum chamber, the accompanying decrease in holding force and holding time, the selectivity of the suction surface, the limitation of the shape due to the bulkiness and the degree of design freedom. is there.

  The present invention is characterized in that a hook structure is formed that uses the force of atmospheric pressure without providing a vacuum chamber.

  The suction hook without the vacuum chamber of the present invention sucks with a thin film, so that the instrument is not bulky. This creates an improvement in holding power, a higher degree of freedom in the hook shape, and an improvement in the design of the hook. In addition, since the holding force is generated at a low degree of vacuum, a significant improvement in holding time is achieved.

FIG. 5 is an explanatory view showing a method of implementing a suction hook without a vacuum chamber. Example 1 FIG. 5 is an explanatory view showing a comparative schematic diagram when a suction body without a vacuum chamber and a suction body with a vacuum chamber suck into a non-ideal suction surface. FIG. 5 is a diagram showing a relationship between forces that a hook position exerts on a peeling force. It is also a diagram showing the basis of the peel force calculation formula. FIG. 6 is a diagram showing the influence of the ratio of the height of the hook to the length of the thin plate (h / D) on the peeling force Fp. It is a graph of peeling force Fp when d = D / 2 (the center of the thin plate) in the formula (2). (Example 2)

  The purpose of suction without providing a vacuum chamber was achieved with a minimum number of parts and improved holding power.

  FIG. 1 is a cross-sectional view of an embodiment of the device of the present invention, and 1-3 are the same as those in FIG. 1 is a thin film, 2 is a thin plate for holding a hook, and 3 is a hook.

  By attaching the hook provided on the thin plate to the thin film, the bulk of the instrument is remarkably reduced and the holding power is improved.

The principle of suction without providing a vacuum chamber is the flexibility and adhesion of the thin film. As shown in FIG. 2, the thin film is supplely adhered to minute irregularities or shallow irregularities on the surface. This increases the contact area between the thin film and the wall, resulting in an increase in suction force and holding time.
If the vacuum chamber is provided, the adhesion of the suction member is adversely affected, and a vacuum chamber that does not become a vacuum can be formed depending on the unevenness of the wall, resulting in a negative effect to impair the effective vacuum area.
The relational expression of the effective vacuum area, the average vacuum degree, and the suction force is expressed as follows.

  In the above formula, as shown in the table, Po is atmospheric pressure, Pv is the average degree of vacuum (pressure) generated in the suction body, A is the suction area of the suction body, and F is the suction force.

  In the above formula, as shown in the table, W is the load applied to the hook, h is the height of the hook measured from the suction surface, D is the length of the thin plate, d is the position of the hook on the thin plate, and Fp is the thin plate. It is the peeling force that is applied to the tip.

When the hook is attached to the center of the thin plate, the peeling force is reduced to about 1/5 of the case where the hook is attached to the end, so the attachment position is optimum at the center. Depending on the height of the hook, the conditions may be different, but the center of the hook position is optimal under the conditions when using a thin film.
As an example, if a hook is provided at a position of 1 mm in the center of a 2 cm × 2 cm thin plate, the peeling force generated at the tip of the thin plate is about 10 g weight (about 0.1 N). When this thin plate is attached to a 3cm x 3cm thin film, the suction force is 45N even under bad conditions, so it will be pressed with a force more than 400 times the peeling force, so a 1kg object is hung on this hook It is easy.
Next, it is confirmed in FIG. 4 that the ratio between the length and height of the thin plate greatly affects the peeling force. When the ratio of the length and height of the thin plate is 0.5, the force half of the load becomes the peeling force. However, when this ratio is 0.1, only 5% of the load is peeled off. The effect of using a thin film to keep the height of the hook low appears. A ratio of about 0.05 is practical. The peeling force at this time is 1% of the load.
The use of thin films as suction bodies and their structures not only simplify shapes and improve design, but also improve holding power and holding time, so not only in homes, offices, showrooms, but also in factories, etc. Can be used in a wide range of applications.

Since the device is thin and has a simple structure and sufficient holding performance, the shape can be freely selected. As a result, in addition to the place where the conventional hook is used, the range of use is expanded. For example, it can be used in narrow places, places where transparency is desired, and places where decoration is required. It can also be used as a device that can be hung on a side surface of a table, desk, etc.

1 Thin film 2 Thin plate 3 Hook

Claims (1)

  A hanging instrument characterized by a structure in which a flexible thin film with a thickness of 5 to 500 microns without a vacuum chamber is used as a suction body, a rigid thin plate is attached to the thin film, and a hook is provided on the thin plate.

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