JPH11256891A - Door knob cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disperssingly transmit gripping force of a gripping hand to prevent idling of a door knob cover, and reduce operation force of a door knob by forming a hanging bell-like door knob cover by an elastic foaming body. SOLUTION: A door knob cover 1 is formed in the form of a hanging bell of an elastic foaming body of natural rubber latex, thickness is about 3 mm at an opening edge and about 11 mm at an intermediate part, and chloroprene latex is applied on the inner peripheral face of a door knob housing part to form the resin coating layer of 0.1 mm. The foaming power of the elastic foaming body is adjusted, 25% compression load value is set to be 40-90 gf/cm<2> . Thereby gripping force of a gripping hand is dispersed through the door knob cover 1, the whole door knob 8 is tightened and idling of the door knob cover 1 can be prevented by friction force. In the case where the compression load value is excessively small, the relieving effect of the operation force of the door knob is reduced by compression of the elastic foaming body, in addition, in the case if it is excessively large, the gripping force is not transmitted to the door knob and idling is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a doorknob cover which covers a doorknob of a building or the like so that the doorknob can be turned easily and surely.

[0002]

2. Description of the Related Art Conventionally, metal doorknobs have been widely used in doors of buildings and the like. With respect to such a doorknob, a doorknob cover to be attached to the doorknob has been developed for the purpose of improving operability and aesthetics, reducing cold and static electricity in winter, and providing cushioning to the body. Of these doorknob covers, for example, the doorknob cover described in Japanese Utility Model Publication No. 52-34843 is based on a sponge sheet or the like, and has a fabric with a piled material sewn on the surface thereof and a sponge on the inner surface. .

[0003]

However, such a doorknob cover is based on a sponge sheet material, and a portion in contact with the doorknob has a porous foam surface, so that sufficient resistance cannot be obtained. Slippage easily occurs between the doorknob cover and the doorknob, so if the grip of the doorknob is weak, idling may occur between the doorknob and the doorknob, and the doorknob may not slide completely against the pushing and pulling force of the doorknob, or may suddenly fall off. Further, since the tension state is always maintained, there is a disadvantage that the material is quickly deteriorated and easily detached from the covered state.

Accordingly, the present invention solves the above-mentioned problems by providing a doorknob cover that can be easily and surely turned by reducing the operation force of the doorknob, is easy to mount, and can withstand long-term mounting. Things.

[0005]

Means for Solving the Problems The invention according to claim 1 is characterized in that
5% compression load value is 40 gf / cm ^{2 to} 90 gf / cm ²
A block-shaped main body is provided by an elastic foam (according to the compression test method of JIS A 5750), a door knob housing having an opening is provided on one side of the main body, and a resin is provided on an inner peripheral surface of the door knob housing. It is a doorknob cover provided with a coating layer.

According to a second aspect of the present invention, there is provided the door knob cover according to the first aspect, wherein the outer periphery of the main body is provided with a decorative shape by irregularities.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 3 show a first embodiment of the present invention. The door knob cover 1 according to the first embodiment is made of an elastic foam obtained by foaming a latex of natural rubber, and is provided in the shape of a bell having a diameter of about 71 mm and a length of about 65 mm. And about 49m in diameter by router from the end face corresponding to the opening of the bell
A hole having a diameter of about 50 mm and a depth of about 50 mm was provided, and a doorknob housing 2 was provided. The outside of the doorknob housing part 2 is a handle part 3
It is made.

[0008] Chloroprene latex (Neoprene 400 manufactured by DuPont, Showa Denko) was applied to the inner peripheral surface of the doorknob accommodating section 2 to form a resin coating layer 4 having a thickness of 0.1 mm. The thickness of the doorknob cover 1, the thickness T ₁ of the opening edge 5 forming the thinnest opening of the door knob housing part 2 is about 3 mm, substantially intermediate portion 6 bulged the outside of the thickest side portions 's the _second thickness T ₂ as saying that about 11 mm, a 3mm~11mm as a whole. The end of the doorknob housing 2 opposite to the opening surface, which corresponds to the top of the bell, forms a slightly thick buffer portion 7.

The inner diameter of the doorknob accommodating portion 2 may be such that the doorknob 8 just fits in.
Preferably, the inner diameter of the doorknob housing 2 is slightly smaller than the maximum diameter of the doorknob 8 so that the doorknob cover 1 can be operated with a small force. This is to prevent the wheel from idling. Thus, the doorknob housing 2 can be easily attached to and detached from the doorknob 8 if it is slightly extended due to its elasticity.

The resin coating layer 4 provided on the inner peripheral surface of the doorknob accommodating portion 2 includes rubber, urethane elastomer and the like in addition to the above-mentioned chloroprene latex which is an elastic resin. These are formed by foaming the body of the doorknob cover 1 and piercing the doorknob housing portion 2, and then applying the paint to the inner peripheral surface of the doorknob housing portion 2. The resin coating layer 4 can be made of a water-based paint, a solvent-based paint, a hot melt, or the like. Further, the resin coating layer 4 is applied so as to cover the air bubble surface of the doorknob accommodating portion 2 so that a sufficient frictional force is generated.

The elastic foam for forming the door knob cover 1 is made of a latex, sulfur, or thiazole accelerator (M
Z), a dithiocarbamate-based accelerator (EZ), an antioxidant (BHT) and the like are blended in an appropriate ratio, foaming is determined by setting an expansion ratio, injected into a mold, and vulcanized after coagulation. The 25% compression load value of the obtained elastic foam is JIS A57
50 gf / cm ^{2 to} 90 g according to the compression test method of No. 50
f / cm ² (the 25% compressive load value of the elastic foam described below is based on the compression test method of JIS A 5750).

Examples and comparative examples are prepared below and compared. First Example The blending of the latex materials used is as described above. Natural rubber latex 100 (dry parts by weight) Sulfur 2.0 Thiazole accelerator (MZ) 2.0 Dithiocarbamate accelerator (EZ) 0.5 Antioxidant (BHT) 1.0 Potassium oleate 2.0 Oxidation Zinc 4.5 Reaction product of ethyl claroid, formaldehyde and ammonia (trimene base manufactured by Uniroyal) 0.5 Sodium silicofluoride 4.0 Latex raw material thus blended is 25% of the elastic foam obtained. Foaming was performed so that the expansion ratio became about 6.7 times so that the compression load value became 65 gf / cm ^2, and the mixture was poured into a bell-shaped mold, solidified, heated at 120 ° C. for 40 minutes, The bell-shaped foam was obtained through the steps of washing, dehydration, drying, perforation, and latex coating after taking out the bell-shaped mold.

Second Embodiment A 25% compressive load value of the obtained elastic foam is 40 gf /
An elastic foam was obtained in the same manner as in the first example except that the expansion ratio was set to about 10 so as to obtain cm ² .

Third Embodiment A 25% compressive load value of the obtained elastic foam is 90 gf /
An elastic foam was obtained in the same manner as in the first example except that the expansion ratio was set to about 5 so as to obtain cm ² .

Comparative Example 1 A 25% compression load value of the obtained elastic foam was 30 gf /
An expansion ratio was set to about 12.5 times so as to obtain cm ^2, and an elastic foam was obtained in the same manner as in the first example.

Comparative Example 2 A 25% compression load value of the obtained elastic foam was 100 gf.
/ Cm ² , the expansion ratio was set to about 4.3 times, and the other conditions were the same as in the first example to obtain an elastic foam.

Comparative Example 3 An elastic foam was obtained in the same manner as in the first example except that no resin coating layer was provided in the door knob storage portion.

Next, the elastic foams of the first to third examples and comparative examples 1 to 3 were compared by the following method. A smooth stainless steel door knob 8 shown in FIG. 4 (GF type manufactured by Galle Co., Ltd., the maximum diameter L ₁ of the grip portion is 50 mm, and the minimum diameter L _{2 is}
Is 48 mm, the length L ₃ is 34 mm, doorknob rotational force at the maximum diameter was 700 gf) to put each doorknob cover of Comparative Examples and Examples of the respective opened and closed the door.

The door knob is provided with a spring inside the door knob so that the door knob always returns to the original position when the door knob is turned. Therefore, as the operating force to turn the door knob,
First, two forces are required: a gripping force for gripping the doorknob and a rotational force for turning the doorknob against the force of the spring. Normally, to open and close the door, the user grips the door knob with his or her grip and then turns the wrist by turning the wrist.
At this time, the force required for the rotation is a force against the spring of the door knob, which is 0.7 kgf in the above case. No matter who operates this door knob, the required force is 0.7kg
f. On the other hand, the grip strength to hold the doorknob varies from person to person, and when we measured the load cell as a doorknob,
0.7 to 1.5 kg of grip when weakly gripped
f, the grip strength when strongly gripping was 3 kgf.
With very weak grip, slippage occurred between the hand and the doorknob, and the doorknob did not turn. In this way, the doorknob is firmly held down by the gripping force, and a frictional force is generated between the hand and the doorknob to turn the wrist, thereby rotating the doorknob and opening and closing the door.

The results are shown in Table 1 below.

[Table 1] Example Comparative example 1 2 3 1 2 3 25% compressive load value (gf / cm ² ) 65 40 90 30 100 65 Presence or absence of resin coating layer in door knob housing section Yes Yes Yes Yes Yes No Hold the door knob No idle when turning No No No No Yes Yes Reduction of door knob operation force Yes No Yes Yes Yes No No No

"Yes" is given to the case where the resin coating layer is applied to the inner peripheral surface of the doorknob accommodating portion, and "No" is given to the case where the resin coating layer is not applied. In addition, in the above-mentioned "whether or not the doorknob rotates when the doorknob is turned", when the doorknob cover is mounted with the force of 1 kgf and the doorknob 8 is turned, "None" is given to the case where the doorknob cover can be turned without idling. No. 8 was marked with "Yes" when it slipped.

In this comparison, assuming that the door knob 8 is easily rotated, the door knob 8 is gripped and rotated with a small grip force of 1 kgf. As a result, the first to third
In the embodiment, the door knob 8 can be rotated with a small gripping force of 1 kgf, and as the diameter of the door knob 8 increases, the rotating force is reduced, and the operating force is reduced. On the other hand, in Comparative Example 1, the doorknob 8 did not idle, but the grip of the doorknob cover greatly deformed, and the force for rotating the doorknob 8 was hardly reduced.
When I grabbed it, I couldn't grasp it. In Comparative Examples 2 and 3, the door knob 8 and the door knob cover idled, and the door knob 8 had to be gripped with a stronger force. Further, in the first to third examples and Comparative Examples 1 and 2, the chloroprene latex was applied as a resin coating layer on the inner peripheral surface of the doorknob accommodating portion.
, The friction between the doorknob 8 and the doorknob cover increased, making it difficult for the wheel to slip.

In the first to third embodiments and the comparative example 3, the 25% compressive load value of the door knob cover is set to 40 gf / c.
Since the value was set to a value between m ² and 90 gf / cm ^2, the gripping force was dispersed through the door knob cover made of foam and the door knob 8
The entire body was tightened and tightened, so frictional force was easily generated, and this frictional force became stronger as the grip was increased to apply the rotational force, which helped prevent the doorknob cover from spinning. However, in Comparative Example 1, the 25% compressive load value was small, the foam was compressed by the force to grip the door knob, the effect of increasing the outer diameter of the door knob was small, and the reduction of the rotational force was small. In Comparative Example 2, the 25% compression load value was large,
The force of gripping the doorknob was not effectively transmitted to the inner peripheral surface of the doorknob housing, causing an idling. In Comparative Example 3, there was no resin coating layer on the inner peripheral surface of the doorknob accommodating portion, and idling occurred. As a result, in Comparative Examples 1 to 3, the operating force of the door knob could not be effectively reduced. Further, in the first to third embodiments,
By setting the 25% compression load value within the above range and further providing a resin coating layer on the inner peripheral surface of the doorknob accommodating portion, idling of the doorknob cover was reliably prevented, and the operating force of the doorknob was reduced.

Further, the diameter of the end of the door knob 8 opposite to the door side is the maximum diameter, this diameter is 50 mm, the diameter of the end on the door side is the minimum diameter, and this diameter is 48 mm. is there. Since the inside diameter of the doorknob housing portion of the doorknob cover is set to 49 mm larger than the minimum diameter and smaller than the maximum diameter, the doorknob cover can be easily mounted on the doorknob 8 and cannot be easily removed once mounted. In addition, these door knob covers are less deteriorated in their materials and can withstand long-term mounting. Further, in the past, when the door was opened, the doorknob 8 hit the wall surface as it was, so that the wall surface could be damaged, but if the doorknob cover was attached, the thickness of the wall opposite to the opening surface of the doorknob cover was increased. Part is buffer part 7
It did not hurt the wall.

When the doorknob 8 without the doorknob cover was turned while wearing gloves made of wool knit, the slippage was extremely difficult to rotate and required a grip force of 5 kgf. First
When the door knob 8 with the door knob cover 1 of the embodiment was turned, the door knob 8 could be easily turned, and the grip force required only 1 kgf, which was the same as when turning with a bare hand. Although the doorknob cover 1 is partially tensioned, it is not strongly tensioned as a whole, so that deterioration of the material is small.

Further, in the present invention, the shape of the elastic foam is bell-shaped. However, the present invention is not limited to this, and the doorknob receiving portion can be appropriately formed inside the doorknob cover. When turning with holding
As long as there is no slippage between the doorknob cover and the doorknob, and the doorknob cover can rotate properly, the outer shape of the doorknob cover can be a desired one without being restricted. In addition to the shape of the outer shape, for example, an arbitrary decorative shape can be applied to the outer periphery of the door knob cover 1 by means of irregularities, for example, an animal such as a lion or a fruit such as a pineapple. However, even with these decorations, when the door knob 8 is gripped, the unevenness due to these decorations is absorbed by these elasticities because the door knob cover 1 is formed of an elastic foam, and the door knob 8 is operated. No problem.

In the above embodiment, the latex material is foamed, the router is used to pierce the doorknob housing portion, and then the resin is separately applied to the inner peripheral surface of the housing portion. Alternatively, the doorknob housing 2 can be simultaneously formed using a mold. If molded at the same time, a so-called skin layer (hereinafter simply referred to as "skin layer"), which is a thin layer of foam resin denser than the inside of the foam, is formed on the inner peripheral surface of the door knob housing portion 2, and this skin layer is formed. Can be used as the resin coating layer 4 of the present invention. That is, when the foamed latex has a low expansion ratio, the skin layer has relatively low porosity and can be used as it is as the resin coating layer 4 of the door knob cover. In this case, the skin layer has a porosity of: JIS L 1096
It is preferable that the air permeability is 6.0 cm ³ / cm ² / s or less according to (air permeability test method in Japanese Industrial Standards, General Textile Test Method). However, when this latex has a high expansion ratio, the skin layer is relatively porous, and even when the skin layer has irregularities, an appropriate frictional force may not be obtained. A resin coating layer 4 is separately provided as in the embodiment. The resin coating layer 4 can be formed even when the frictional force on the surface of the doorknob cover main body 1 is insufficient.

In the above embodiment, a natural rubber latex is used as a foaming material. However, the present invention is not limited to this as long as it is formed as an elastic foam.
Further, in order to facilitate the mounting on the doorknob and the rotation when the doorknob is mounted on the doorknob, the inner diameter of the doorknob accommodating portion is slightly larger than the diameter of the outer peripheral end of the doorknob on the door side which is the minimum diameter of the doorknob. Although the diameter is smaller than the maximum diameter which is the diameter of the end opposite to the door, this is not an essential requirement of the present invention. In addition, the surface of the door knob cover can be planted or painted, and the door knob cover can be provided with a small through hole for a keyhole.

FIGS. 5 to 7 show other embodiments. In this embodiment, the door knob cover is used for a lever type door knob 18. In this case, the doorknob cover 11 has a block shape but an elongated shape, and the doorknob housing 12, the handle 13,
And the resin coating layer 14 is the same as in the above embodiment. In this embodiment, as shown in FIG. 6, the door knob cover 11 is mounted in a substantially key shape along the shape of the lever portion 18a of the lever type door knob 18, so that the door knob cover 11 is attached to the door knob 18 of the door knob cover 11. It is hard to fall off in conjunction with the degree of adhesion. As described above, unlike the above-described embodiment, the lever-type door knob 18 does not grasp and rotate the outer periphery of the door knob 18 and rotates the lever portion 18a of the door knob 18 in rotation. Therefore, by attaching the door knob cover 11 to the lever portion 18a, the door knob 18 can be rotated reliably and easily, and the grip force that forms the operating force together with the rotating force is reduced, and the operating force is also reduced. Is what is done. Further, the door knob cover 11 is easy to mount. As described above, the door knob to which the door knob cover of the present invention is attached is not limited to the bell-shaped door knob 8 used in the above embodiment.

[0030]

According to the first aspect of the present invention, the main body is provided by an elastic foam having a 25% compressive load value of 40 gf / cm ^{2 to} 90 gf / cm ² , and a resin coating is formed on the inner peripheral surface of the door knob housing portion. Since the layers are provided, the operating force of the door knob can be greatly reduced, and the door knob can be easily and reliably turned with a small force. In addition, these doorknob covers are hardly deteriorated due to their materials and can withstand long-term mounting. Moreover, it is extremely easy to attach and detach to and from the door knob.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the outer periphery of the doorknob cover body is formed with a decorative shape by means of irregularities, so that it is possible to respond to the preference of a person who uses the doorknob cover. The hobby is widened, and the unevenness can reduce the operating force of the door knob.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a door knob cover according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state where the door knob cover according to the embodiment of the present invention is actually put on the door knob;

FIG. 3 is an external perspective view of a door knob cover according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a door knob.

FIG. 5 is a longitudinal sectional view of a door knob cover according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a state in which a door knob cover according to another embodiment of the present invention is actually put on the door knob.

FIG. 7 is a vertical sectional view of a lever type door knob.

[Explanation of symbols]

1 door knob cover 2
Door knob housing 4 Resin coating layer

Claims (2)

[Claims] 1. A block-shaped main body is provided by an elastic foam having a 25% compression load value of 40 gf / cm ^{2 to} 90 gf / cm ² (according to a compression test method of JIS A 5750), and one side of the main body is provided. A doorknob cover, comprising: a doorknob housing having an opening; and a resin coating layer provided on an inner peripheral surface of the doorknob housing. 2. The door knob cover according to claim 1, wherein the outer periphery of the main body is provided with a decorative shape by irregularities.