JPS63143007A - Paint brush easy to handle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a paint brush that includes a handle and a bristle holder having bristles.

[Conventional technology]

Paintbrushes have been used for centuries, and their form has remained essentially unchanged. Even when modern materials such as synthetics are used in the manufacture of the handle and possibly the bristle retainer, the thickness of these parts will be kept as thin as possible for cost reasons; Connections between parts will always be rigid.

U.S. Pat. No. 4,127,296 discloses an extension holder for a paintbrush, which is intended to hold a standard paintbrush longer than the arm, mimicking the flexible movement of the wrist. ing. To this end, the handle of a standard paintbrush is flexibly connected to the tool, where the handle is rigidly connected to a bristle holder to ensure proper functioning.

DE 482,051 discloses a radiator brush whose handle can be attached to the bristle holder at various angles. In that case, there is no doubt that the angle between the handle and the bristle retainer will change during normal use.

During the use of standard paint brushes with a rigid connection between the handle and the bristle holder, the angle between the bristles and the surface to be painted can vary depending on the pressure exerted by the person holding the brush on the surface being treated. Probably. However, in the normal position in which the paint brush is held in the hand, the angle of the brush bristles is greater than desired and the bristles encounter significant resistance. For this reason, the painter and especially his wrists tire quickly, especially when relatively large brushes are used and a relatively large number of coats are applied per unit time.

(Problems to be Solved by the Invention) It is an object of the present invention to provide a paint brush that is easy to handle so that the use of the paint brush causes less fatigue and allows the application of thinner coats of paint. be.

[Means to solve the problem]

The paint brush of the invention is characterized in that there is a connection between the handle and the bristle holder that is flexible in two or more directions.

This flexible connection reduces the angle of the bristles relative to the surface being painted than would be the case with a conventional paint brush of the same bristle length applied with the same force. Furthermore, when using the paint brush of the present invention, the maximum angle between the normal to the surface to be painted and the handle, and the maximum angle between the part of the hand between the fingers and wrist and the surface to be painted are It is much smaller than when using a brush.

Finally, the lateral forces exerted on a conventional paint brush as the brush moves horizontally across a substrate to be painted, such as steel, are greater than when the paint brush of the present invention is otherwise similarly used. As large as 23%. As a result, the present invention makes the painter much less tiring. Another advantage of the invention is that thinner layers of paint can be obtained. Yet another advantage is that it is easier to apply paints, especially low viscosity types of paints such as chlorinated rubber paints or epoxy paints. Finally, the paint brush allows even easy-to-smear paints, such as water-thin paints, to be applied in thinner layers than with a conventional Bain 1 brush.

U.S. Pat. No. 4,488,328 to Ming II discloses a toothbrush in which the brush head is capable of limited pivoting movement on an axis across the handle in order to obtain maximum contact between the brush bristles and the teeth. I have to say something. U.S. Pat. No. 4,575,894 also discloses a toothbrush for brushing teeth according to a medically recommended method, wherein the brush completely cleans the teeth and gums and eliminates double feed. Disclose. To this end, a toothbrush is described which has a resilient component between the bristle retainer and the rest of the toothbrush that resists rotation of the bristle retainer due to forces exerted on the bristle retainer with the bristles during brushing. ing.

The handle of the paintbrush of the invention can be made of any conventional material, usually wood or plastic (including elastomers), and can have various cross-sections, such as round, flat, or oval. I can do it.

The bristle retainer can be made of any suitable material, for example based on metal or other materials, such as thermosetting or thermoplastic synthetic materials. The tufts of bristles are generally rectangular,
It can have a square, round, oval or other cross-sectional shape. The length of the bristles outside the bristle retainer is usually 1 to 10 cm, preferably 2 to 8 cm. The material of the bristles can also be any old type, animal hair such as pig bristles or horse bristles,
or of synthetic material, such as polyester or polyamide, and can be in the form of a capillary, if desired.

According to the invention, the flexible connection between the handle and the bristle holder can be formed by a hinge-shaped element in combination with a leaf spring on either side of at least a part of the bristle holder, the plate The spring is fixedly connected to the handle. In another embodiment, there are leaf springs fixedly connected to the bristle retainers on either side of at least a portion of the handle. The strength of the leaf spring is
Flexible connections can be selected according to the desired degree of resilience. The leaf spring can be made of any conventional material.

A preferred embodiment of the flexible connection is that the side of the bristle retainer remote from the bristles is embedded in or fixed to the desired elastic rubber-like material, which rubber-like material may also be connected directly to the handle. It consists of things that can be done without. The rubber-like material usually has the shape of a block of substantially rectangular cross-section, preferably between 10 and 80. More preferably, it has a Shore A hardness in the range of 20-70. Rubber-like materials include elastomers that are resistant to organic solvents, such as fluorocarbon elastomers, polyurethanes, polychloroprene or polyisoprene, which may also contain customary additives.

The rubber-like material and handle can be connected to each other in any suitable manner. For example, the rubber-like material can be provided with a hole to accommodate the end of the handle, and this connection can be locked if desired, for example by bolts and screws. One preferred embodiment of the connection between the rubber-like material and the handle is formed by a non-flexible metal plate, one end of which is embedded in the rubber-like material and the other end retained within the handle. Another embodiment of the connection between the rubber-like material and the handle consists of a clamp that is fixedly connected to the handle and grips the rubber-like material. Another simple embodiment of a flexible connection between the handle and the bristle holder is formed by a flexible plate or strip.

It can be made of any suitable material, such as metal or plastic. An advantage of such an arrangement is that the bristle holder with the bristles can be easily replaced. If desired, flexible connections can be provided at two or more locations between the bristle holder and the handle.

A most preferred embodiment of the paintbrush of the invention is such that the area between the bristle holder and the handle is sufficiently thin and of elastic polymer, for example at least a part of the bottom of the bristle holder, so that it is flexible in all directions. Be flexible. This method creates a flexible hinge between the bristle retainer and the handle.

Suitable elastic polymers include polyurethanes, but preferably polyester elastomers, such as copolyether esters based on polybutylene terephthalate and polyalkylene oxide glycols such as polytetrahydrofuran and ethylene oxide-blocked polypropylene oxide glycols; Based on butylene terephthalate and on the other hand voicaprolactone and/or polybutylene adipate, these moieties are polyester ester urethanes: and polyether ester amides, which are linked by ester and/or urethane bonds. The polybutylene terephthalate moiety in the elastomer described above is preferably 2C4
Up to m% polybutylene isophthalate can optionally be included. The polyester elastomers are commercially available, especially Arntel from Akzo Plastics.
(trademark). The above-mentioned elastomers generally have a Shore D hardness of 30-100, preferably 50-90. Copolyetheresters consisting of 80 to 92% by weight of polybutylene terephthalate and 8 to 20% by weight of polytetrahydrofuran terephthalate can be advantageously used. The essential advantage of these elastomers is that they can be processed by injection molding. These elastomers also resist solvents and high temperatures, have excellent tear strength and resistance to aging due to repeated deflection loading. Another advantage is that available polyester elastomers can be selected from a wide range of softness moduli, thus allowing paintbrushes of different softness to be made in the same mold.

If desired, the embodiment described above allows the handle to be made integral with the bristle holder. However, it is also possible to connect the handle to the bristle holder, for example by means of a screw connection or a snap connection. If desired, the ends of the bristle holder can be shaped in a conventional manner, for example so that the bundle of bristles connected to the bristle holder can be replaced. The advantages of the embodiment described above are that the pivot axis of the flexible synthetic hinge is at the shortest possible distance from the bristle retainer, that the hinge is lightweight and forms a close unit that is extremely easy to clean, and The stroke of the hinge is limited.

When the bristle retainer is clamped, a force of at least 2ON perpendicular to the handle applied at a distance of 20# from the hinge.
7/d (where d is the minimum diameter of the handle in the plane of the hinge (
Preferably, the synthetic hinge is flexible enough to cause a displacement f (in meters) of the handle, which is Mn units).

The paintbrush of the invention is particularly suitable for use in spreading brushable materials such as paints (including varnishes, lacquers and dyes), bitumen, coal tar, anthracene oils, glue, fillers and the like. There is. The term paintbrush as used herein means paintbrushes and corner brushes with or without feed channels.

The invention also relates to a method of applying paint to a substrate using the paintbrush of the invention. The invention also relates to the coated substrates thus obtained.

The invention will be illustrated with reference to the drawings. Figure 1 shows handle 1
, and a bristle holder 2 having bristles 3. A non-flexible metal plate 4 is fixedly connected to the handle 1 at one end and embedded in a block of rubber-like material 5 at the other end. The substance 5 is surrounded by and fixedly connected to a cap 6, which in turn is fixedly connected to the bristle holder 2.

In FIGS. 2 and 3, parts corresponding to parts of the paintbrush in FIG. 1 are numbered the same. In the embodiment of FIG. 2, the flexible connection between the handle 1 and the bristle holder 2 is formed by a flexible plate 7, which has one end fixedly connected to the handle 1. and has its other end fixedly connected to a threaded connection 8, while the threaded connection 8 is fixedly connected to the bristle holder 2. In this embodiment, the bristle holder 2 with the bristles 3 can be exchanged/exchanged.

FIG. 3 shows a paint brush in which the object to be brushed is fed to the bristles 3 through a line 9 and a flexible line 10 and a hollow space in the bristle holder 2 (not shown). The parts between lines 9 and 10 and between line 10 and the hollow space are each formed by two connectors 11 and one coupling nut 12. The two blocks of rubber-like substance 13 are attached to the handle 1 by means of an anchoring element 14 and to the bristle retainer 2 via a connecting part 15.
Fixedly connected to.

FIG. 4 is to scale, in which parts corresponding to parts of the paintbrush in FIG. 1 are numbered the same. Thin wall thickness 0.8 between handle 1 and bristle holding part 2
The flexible connection 16 of #) is shown there in its simplest and essential form, namely as a flexible diaphragm hinge made of polyester elastomer. The short illustrated part of the handle 1 can of course be given the desired length or, for example, with a snap connection in order to connect it to an additional part of the handle (which may optionally be made of another material). Or it can be provided with a screw connection. The bristle holder 2 can be provided with a bundle of bristles (not shown), which may or may not be replaced, in a known manner.

Of course, the paints of the invention can be provided with bristle holders of FIG. 4 having larger or smaller dimensions, for example bristle holders that are about 10-20% smaller.

Example 1 A brush according to FIG. 1 was used having as rubber-like material a fluorocarbon elastomer (available from DuPont under the trademark Viton) mixed with carbon black and having a Shore A hardness of 60.

The bundle of bristles in the bristle holder (bristle length 6 cm) has a circular cross section (small round brush) and an oval cross section (oval brush).Using these two brushes, paint a wall with standard paint. Some parts were painted. The thickness of the paint film was measured in the dry state. The ease with which the paint could be applied was also evaluated.

The experiment was conducted by an experienced person and an inexperienced person. The results are shown in Table 1. For comparison, the experiment was repeated using the same conventional brush, but without a flexible connection between the handle and the bristle retainer. Everyone has found that it takes more time to perform the same task with a conventional brush than with the brush of the present invention.

The results are shown in Table 2.

Table 1 (Invention) Table 2 (Conventional Brushes) Example 2 Example 1 was repeated using a small round brush, except that 8
8.7% by weight polybutylene terephthalate and 12.3% by weight
% by weight of polytetrahydrofuran terephthalate and has a Shore D hardness of 74 (trademark Arntel 7 from Akzo Plastics).
A paint brush with a flexible diaphragm hinge according to FIG. 4 was used, consisting of 4 [commercially available as )]. Table 3 shows the results obtained with this paintbrush and with a similar conventional painted brush of the same weight but without a flexible membrane hinge.

Table 3

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an example of the paint brush of the present invention. FIG. 2 is a longitudinal cross-sectional view of another example of the paint brush of the present invention. FIG. 3 is a cross-sectional view of a so-called airline brush with a feed channel for the substance to be applied by the brush. FIG. 4 is a cross-sectional view of the bristle retainer and the root of the handle in full scale of the most preferred embodiment of the present invention. Applicant: Akzo Namrose Fennote Jatsubu

Claims (1)

[Claims] 1. A paint brush including a handle and a bristle holder having bristles, characterized in that a connection is provided between the handle and the bristle holder that is flexible in two or more directions. paint brush. 2. The paint brush according to claim 1, wherein the side of the bristle holding part remote from the bristles is embedded in or fixedly connected to a rubber-like substance, and the rubber-like substance is connected to the handle. 3. A paint brush according to claim 2, wherein the rubber-like material has a Shore A hardness in the range of 10 to 80. 4. The paint brush according to claim 1, wherein the portion between the bristle holding portion and the handle is flexible in all directions. 5. The paint brush according to claim 4, wherein the bristle holding portion is made of an elastic polymer. 6. The paint brush according to claim 5, wherein the elastic polymer is a polyester elastomer. 7. The paint brush according to claim 6, wherein the polyester elastomer is a copolyetherester consisting of 80-92% by weight of polybutylene terephthalate and 8-20% by weight of polytetrahydrofuran terephthalate. 8. The paintbrush of claim 1, wherein the flexible connection is a flexible diaphragm hinge.