Chemistry: electrical current producing apparatus – product – and – Cell support for removable cell – Having switch or interlock means
Patent
1993-03-11
1994-11-29
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Cell support for removable cell
Having switch or interlock means
429123, 439338, 439366, H01M 210
Patent
active
053689542
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device on electric hand power tools for a mechanical and electrical coupling of batteries.
More particularly, it relates to a device of the above mentioned general type, which has a locating arrangement for coupling of batteries.
From DE-A-37 42 268, an electric tool with a facility for locating and retaining battery packs in and/or on the tool casing is known, in which the battery pack can be fixed to the hand tool by means of an additional ring. The electric tool, the battery pack, and the ring, are fitted with locking elements, and a pushing and turning movement are required for the coupling of the battery pack. Before locating the battery pack, the user must further make sure that the ring is in the correct rotational position relative to the electric tool. The manufacture and the operation of this coupling facility are relatively elaborate. Moreover, the battery contacts are open to the outside of the battery pack, which can lead to short circuiting.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a device for mechanical and electrical coupling of batteries on electric power hand tools, which avoids the disadvantaged of the prior art.
In keeping with these objects and with others which will become apparent herinafter, one feature of the present invention resides, briefly stated, in a device for mechanical and electrical coupling of batteries in accordance with which within the locating arrangement a double bush is arranged with concentrically located electrical power contacts to which corresponding electrical power contacts on a battery casing are assigned, and locking means are arranged for detachable mounting of the battery casing, and the battery casing can be rotated in the locating arrangement.
In accordance with another feature of the present invention a casing for mechanical and electrical coupling of batteries to electrical power hand tools is provided, which has a concentrically circular insertion part and, in accordance in addition, within the insertion part a double plug is provided with concentrically arranged electrical power contacts which are connected to the batteries and locking means is provided for attachment of the casing to the power hand tool.
When the device and the housing are designed in accordance with the present invention, they have the advantage that the connection of the batteries is simplified and that the electrical contacts are protected from bodily contact and shortcircuit. The subject of the invention does not require any operating element on the power hand tool, but requires, in addition to holding the unit, only one hand for connection and release of the battery casing. To prevent accidental release, an axial movement may be provided for, to take place before the turning movement.
In accordance with further advantageous developments and improvements it is of particular advantage that locking means which are designed as undercut recesses are provided in the locating arrangement of the power hand tool which are of angular design in the direction towards the push-in side, and in at least one circumferential direction, they are radiused or chamfered. This facilitates simple snap-in of the locking means on axial insertion of the battery casing into the locating arrangement, and a simple release of the locking means by twisting the .battery casing against the locating arrangement. Coaxial grooves which are asymmetrically distributed at the circumference of the locating arrangement have the advantage that the battery casing can be inserted only in a defined twisting position, so that additionally arranged simple contact surfaces come into contact with their mating surface in a manner which is positionally correct for a signal transmission. This moreover ensures the correct twisting position appropriate for the tool, of the usually not circular battery casing. It is also of particular advantage to design the locking means, either on the locating arrangement or on th
REFERENCES:
patent: 3843224 (1974-10-01), Gerke et al.
patent: 5122427 (1992-06-01), Flowers et al.
Kalafut Stephen
Robert & Bosch GmbH
Striker Michael J.
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