Tools – Handle for tool
Patent
1994-12-12
1997-02-11
Kisliuk, Bruce M.
Tools
Handle for tool
811771, B25G 100
Patent
active
056010036
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention refers to an extruded plastic handle for tools, particularly screwdrivers, having regions of plastics of different hardness, the harder plastic being nondeformable under the forces occurring as the result of the actuating load and the softer plastic, however, permitting slight elastic deformations, and having a central receiving hollow space for the tang or the fastening end of a tool blade.
A handle of this type is known from Federal Republic of Germany Patent 35 25 163. Such compositions of material result, with uniform circumferential distribution, in improved grippability of the handle. While having a stable base body, a grip in the hand of the worker which avoids pressure points is obtained.
In handles with areas of plastics of different hardness there is furthermore the problem of holding the tang of the tool to be inserted in the handle with the necessary stability. For instance, in the case of a screwdriver, the tang must not turn in the handle. In known screwdrivers, therefore, the region of the handle which surrounds the tang is formed of material of harder plastic. The elasticity of this hard material, to be sure, permits subsequent insertion of screwdriver blades in the handle to a limited extent. Ordinarily, such screwdriver blades which are subsequently inserted into the finished handle can also easily be removed again. The hard material as a rule is not adapted to exert the necessary holding force on, for instance the stampings present on the tang for the transmission of torque. On the other hand, if a screwdriver blade were inserted into a handle in which the receiving hollow space is surrounded by an elastic and therefore softer plastic material, while a better anchoring against the pulling-out of the blade could be obtained thereby, but deformations caused by actuation might lead to a loosening of the connection between the tang and the handle.
SUMMARY OF THE INVENTION
Recognizing this, the present invention has set itself the object of so developing a handle of this type in a manner which is advantageous for manufacture that, with optimal cohesion of the zones, the elasticity of the handle is increased and, in particular, a high degree of compensation of the deformations caused by actuation is obtained.
As a result of the development of the invention a handle of this type which is of increased stability in use is obtained. If, for instance, the center part is developed with a profiled outer surface and made of a harder material, then this center part can receive the tang of a tool, for instance a screwdriver blade. Fins or the like on the screwdriver blade which are intended to impart torque to the tool then no longer lie in the soft plastic material, but in the hard plastic material. By means of the cross-sectional profiling of the center part, which is preferably profiled in the form of a gear wheel or in star shape, a torque can be transmitted to the blade from a soft material which surrounds the hard center part without producing a loosening of the attachment between the tang and the handle. With this development, the elastic holding forces which secure the tang against being pulled out of the center part are not applied by the hard plastic material but can be applied by the softer material surrounding the hard plastic material. The action of the elasticity of the softer region can in this connection be transmitted to the tang via a substantially inelastic displacement of regions of the center part. From a manufacturing standpoint the possibility exists of producing the center part with intended break points extending parallel to the axis of the hollow space which are broken upon the driving-in of the tang. In this way, there are then produced partial regions of hard material extending parallel to the axis of the tang which are separated by a slit or the like, which regions clamp between them the region of the tang which is inserted into the handle. The force between the center regions separated by the slit or the like i
REFERENCES:
patent: 2985209 (1961-05-01), Novelo
patent: 3189069 (1965-06-01), Stowell
patent: 3592247 (1971-07-01), Solf
patent: 4290465 (1981-09-01), Fee et al.
Amtenbrink Klaus
Hoy Robert
Strauch Martin
Danganan Joni B.
Farber Martin A.
Kisliuk Bruce M.
Wera Werk Hermann Werner GmbH & Co.
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