JPS582282Y2 - Scrubber with handle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a scrubbing brush with a handle made of synthetic resin, and particularly to a joint structure between the scrubber body and the handle.

A scrubbing brush with a handle has a structure in which the protruding end of a metal wire, which serves as a core wire of the scrubber body, is attached to a synthetic resin handle.

Furthermore, most of the synthetic resin used for the handle of this kind of handle scrubbing brush is polypropylene resin.

However, there is no adhesive suitable for this synthetic resin, and as proposed in Utility Model Publication No. 47-19324, simply inserting the protruding end from the scrubbing brush body into the hole in the handle and gluing at the inserted part does not provide enough adhesive strength. It becomes insufficient.

When using other synthetic resins, such as styrene resin and ABC resin, it is important to know that there is an adhesive suitable for these synthetic resins. The latter lacks elasticity as a handle, and the latter is unsuitable in terms of price.

On the other hand, as a means of joining a metal core wire to a handle made of polypropylene resin, it is also possible to heat the protruding end of the core wire and press fit it into the hole of the handle made of polypropylene resin.
In this case, although the synthetic resin melts and hardens to ensure sufficient bonding with the protruding end, there is a risk that the scrubber main body may be burnt out when the protruding end is heated.

The purpose of the present invention is to increase the bonding strength between the handle and the core wire using only an adhesive in a handle made of polypropylene.

The technical means of the present invention for solving the above problems is to provide a hole that is open only on the tip side at the tip of the handle, form a recessed notch at the end of the core wire protruding from the scrubbing brush body, and to is inserted into the hole, and the constituting wall surface of the hole and the outer surface of the protruding end are joined with an expansion hardening type adhesive in an expansion hardening state.

According to the above-mentioned technical means, since the hole in the handle is open only on one side, the adhesive in the expanding and hardening state is not allowed to expand in the axial direction of the hole, compared to the case where the hole can expand freely on both sides in the axial direction of the hole. The degree of expansion is also suppressed to a low level, and internal stress remains in the adhesive in this state due to the prevention of expansion toward the inner circumferential surface of the hole.

Therefore, in addition to the adhesive strength, the adhesive in this state has a force that prevents it from being pulled out due to the frictional force of pressure contact with the inner circumferential wall of the hole, and the strength of the bond between the protruding end of the core wire and the handle is sufficiently increased. Different.

In addition, since the adhesive can be mechanically secured to the concave portion provided at the projecting end, the bonding strength can be further improved.

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a handle, and a hole 2 that opens on one side is formed at the distal end of the handle, and the hole has a protruding end 5. The size is set appropriately to match the size of 5.

The scrubber main body has a structure in which nonwoven fabrics are bonded together with an adhesive, and the core wire 4 is located at the bonded part, and the core wire and the scrubber main body are integrated.

As shown in FIG. 2, the scrubbing brush main body 3 constructed as described above is constructed by inserting the protruding ends 5, 5 of the core wire 1 into the hole 2 of the handle 1, and applying an expansion hardening type adhesive 6 such as a foaming type adhesive. The protruding ends 5, 5 are formed with a plurality of recessed notches 7, 7, which are filled in the gap and combined with the handle 1.

In the case of the above embodiment, the adhesive 6 expands and hardens due to adhesion, but most of the expansion is blocked by the side wall of the hole 2, and a portion of the expansion forms a bulge 9 at the opening end 8 of the hole. appears.

Therefore, when the adhesive 6 is in a hardened state, the hardened adhesive is bitten into the recessed parts 7, 7 of the protruding ends 5, 5, and the outer peripheral part is joined to the synthetic resin of the peripheral wall of the hole 2. Of course, they are in a state of frictional bonding with sufficient expansion pressure, and the bonding state of the two exhibits a bonding (bonding) strength that exceeds the bonding strength of the adhesive, and there is no friction at the joint between the core wire 4 and the handle 1. It can be used for a long period of time without worrying that the part will loosen even if subjected to repeated bending stress or the like.

In addition, in the case of polypropylene resin, there is currently no adhesive that can be applied to it and has sufficient adhesive strength, but even if the handle 1 is molded from such a synthetic resin, the adhesive 6 and the peripheral wall of the hole 2 Because it is in a friction-bonded state that responds to the expansion pressure, it exhibits sufficient bond strength and is easier to work with than the conventionally used heat-welded bond.
Furthermore, there is no need to worry about damaging the scrubbing brush main body 3.

In the case of the illustrated embodiment, a through hole 1 is provided on the side wall of the hole 2 of the handle 1.
0, when the adhesive 6 hardens, the adhesive 6 expands and enters the through hole, and the core wire 4 and handle 1 are
The hardened adhesive 6 appears to be mechanically bonded, and the bonding strength becomes even stronger.

Further, in the case of the illustrated embodiment, a plurality of recessed notches 7, 7 are formed in the protruding end portions 5, 5, but the effects of the present invention will not change if these are formed into a plurality of ribs.

[Brief explanation of the drawing]

Fig. 1 is an exploded view of the embodiment of the present invention, and Fig. 2 is a sectional view of the combined state.
... Hole, 4... Core wire.

Claims (1)

[Scope of utility model registration request] A hole 2 that opens only on the tip side is formed at the tip of the handle 1 made of polypropylene resin, and a recessed notch 7 is formed on the surface of the protruding end 5 of the core wire 4 that is integrated with the scrubber body. The protruding end portion is inserted into the hole portion 2, and the constituent wall surface of the hole portion 2 and the periphery of the protruding end portion are joined with an expansion hardening type adhesive in an expansion hardening state.