Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Handle – handle component – or handle adjunct – Luggage-type
Patent
1997-05-05
1999-04-27
Mah, Chuck Y.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Handle, handle component, or handle adjunct
Luggage-type
407 2915, B26D 112
Patent
active
058966218
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to handles for hand-held tools and then particularly, but not exclusively, for files of the kind provided with a tang which is inserted into the handle, said handle including at least two parts which are separated in the tang-insertion direction and provided with tang guide means.
Several different designs of handles for hand-held files and like tools are known to the art. The majority of these handles fall into the following two main types.
The first and the simplest type of handle includes an axially extending hole or passage into which the file tang is pressed. The file tang is normally provided with a slightly conical, four-cornered attachment means. The handle thus has the simplest conceivable design, which enables it to be manufactured at low cost. One drawback with handles of this design, however, is that the handle cannot always be relied upon to grip the file firmly, and there is a risk of the file loosening in the handle and sliding therefrom while being used. This drawback has become particularly pronounced with handles that are made of plastic material, as is now more usually the case, which generates a low coefficient of friction between file and handle.
In the case of handles that belong to the second main type or category, the axially extending hole intended to receive the file tang is surrounded by thin, resilient jaws. The tang has a screw-threaded part and when the file has been inserted into the handle a nut is fitted over the file and tightened on the screw-threaded part of the tang. The resilient jaws are therewith pressed against the file and hold the file firmly in the handle. Manufacture of this handle, however, is a complicated process and the cost of manufacture is commensurately high.
U.S. Pat. No. 1,436,556 describes a file handle comprised of two halves of a metal shell which are pressed one against the other. Each shell half has cut therefrom two tongues which are pressed into the handle. By pressing the two shell halves together, a file can be inserted into the shaft and clamped firmly between said tongues, due to a tendency of the shell halves to spring back.
In addition to the manufacture of this handle being relatively complicated, another serious drawback with this known handle is that as the file is used it tends to loosen in the handle as a result of the workman involuntarily squeezing together the two handle halves with his/her hand during a working operation.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a handle for hand-held tools which avoids the aforesaid problems and which can be manufactured in a highly rational manner in one single piece.
According to the present invention, a handle of the kind described in the first paragraph is characterized in that one guide means has the form of a hole in the one handle part, and that a guide surface in the other handle part intended for coaction with the tang of the file is displaced transversely in relation to a corresponding surface in said hole; and in that the two handle parts are resiliently movable in relation to one another so as to permit a reduction in the displacement between said surfaces as the tang is inserted into the handle.
A handle of this kind can be manufactured from a suitable plastic material in a simple plastic tool. A tool inserted into the handle will be securely held therein during a working operation, by virtue of the fact that the forces which secure the tool in the handle increase as the tool is pressed against the workpiece in the intended direction. The tool can be released easily from the handle, by pressing one of said handle parts in the direction opposite to the direction in which it is pressed during a working operation.
BRIEF DESCRIPTION OF THE FIGURES
The invention will now be described in more detail with reference to exemplifying embodiments thereof and also with reference to the accompanying drawings, in which
FIG. 1 illustrates a first embodiment of a file handle during insertion of a
REFERENCES:
patent: 191811 (1877-06-01), Nicholson
patent: 380660 (1888-04-01), Prankard
patent: 1436556 (1922-11-01), Woodworth
patent: 2229453 (1941-01-01), Heuer
patent: 2388920 (1945-11-01), Jaynes
patent: 2435654 (1948-02-01), Pleva
AB Kompositprodukter Vikmanshyttan
Gurley Donald M.
Mah Chuck Y.
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