Brush handle

Details Brush handle Brush handle

1990-07-20

1992-02-25

Jenkins, Robert W.

Brushing, scrubbing, and general cleaning

Implements

Particular handle

15105, 15145, 151671, 151761, 16110R, D 4104, D 4138, A46B 502, B25G 338

Patent

active

050900803

DESCRIPTION:

BRIEF SUMMARY
This application is based on International Application Number PCT/SE89/00021 filed on Jan. 26, 1989.
The present invention relates to a handle for receiving exchangable brushes or brush pencils having an elongated shaft portion and a brush or brush pencil portion provided at one end of the shaft portion, and especially relates to a handle for receiving interproximal tooth brushes or interdental tooth brushes.
Interproximal or interdental brushes are used for cleaning spaces between and under teeth, bridges and the like, and conventionally consist of twisted wires having bristles secured between the twisted wires. Although it is in many instances possible to hold the brush directly at its shaft portion when cleaning the teeth, there is, especially in connection with thin brushes having weak shafts, a demand for handles for such brushes, partly for permitting a firmer grip of the brush so that its weak shaft portion may be supported better, and partly for facilitating the handling of the brush during cleaning. Since the brushes are worn relatively quickly when used the handle should also be designed in such a way that the brush may be easily and quickly replaced.
In order to meet the above mentioned demands a number of handles of different structure have been developed, and the most commonly used handle is of the general type described for instance in U.S. Pat. No. 4,319,377. This known handle consists of an elongated metal body which is threaded at one end. At the threaded end a hole is provided transversely through the body, whereby the shaft portion of the brush is intended to be introduced into the hole, whereupon that part of the shaft portion which extends through the hole is bent down into a notch extended longitudinally of the body along and somewhat past the threaded portion, and finally a nut provided on the body is screwed up on the threaded portion in order to lock the brush to the handle. Apart from the fact that this known handle requires relatively substansive processing of two separate parts and accordingly is relatively expensive, it is also considered by many persons as clumsy and difficult to use. The method used for attaching the brush also results in considerable damage to the shaft portion of the brush, and since the nut presses directly on the shaft portion the latter tends to fold at this place during use. In other words, instead of stabilizing the brush the handle rather increases the tendency of the brush to fold.
Moreover a plastic handle having substantially the same function as the above described metal handle is known through U.S. Pat. No. 4,222,143. Instead of the threaded end and the nut cooperating therewith, the latter handle uses a plastic sleeve which is displaceable on the handle and which is pushed over that end of the shaft portion which is inserted through the hole of the handle and bent down. Finally the plastic sleeve is locked in said position by means of projections on the handle body. Although the last mentioned handle may probably be manufactured at a lower cost than the above described metal handle, it suffers from largely the same disadvantages as said metal handle. A further variation of the same basic structure as those described above, is known through U.S. Pat. No. 3,892,040 which describes a handle manufactured from plastic and provided at both ends with a thread which cooperates with a plastic nut for locking the brush. The difference is that in this case that portion of the shaft which is inserted through the handle is not bent down, but the complete brush is extended transversely in relation to the handle. However, in this case a special brush or alternatively an adapter must be used in order to prevent that the user injures himself on that part of the shaft portion which is extended through the handle. In closer detail the transversal hole in the handle body is formed having a considerably larger diameter than the twisted shaft portion and a plastic sleeve is attached to the shaft portion of the brush, said plastic sleeve is inserted into the transvers

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