Portable auxiliary current source including a battery and charger
First Claim
1. A portable auxiliary current source comprising at least one battery of high output and small volume and low weight, an automatic charger for the battery, means to connect the charger to a source of electrical energy, a casing enclosing the battery and the charger, a start-stop switch for the current source, and means preventing operation of the source when the source is not in a predetermined operative position, said casing having a prismatic shape characterized by a plurality of obtusely angled edges such that when it rests on a substrate it automatically assumes, under the influence of its own weight, one of only two positions, said two positions being said operative position and a position in which the current source is inaccessible for operation.
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Abstract
A portable auxiliary current source characterized by an overall configuration such that it is stable only in two positions, one of which is the desired operative position and the other of which is a position in which the source controls are inaccessible so that the source cannot be operated. The casing is prismatic in shape, characterized by a plurality of obtusely angled edges. In cross section, it is hexagonal with the base and the top wider than the other surfaces; and the center of gravity is very near the base so that the casing tends to tip toward one of those two positions but prefers the operative position. The casing rests in a cradle that provides handles for moving the source and that is also shaped so as to tip the source toward one of those two positions.
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Citations
9 Claims
- 1. A portable auxiliary current source comprising at least one battery of high output and small volume and low weight, an automatic charger for the battery, means to connect the charger to a source of electrical energy, a casing enclosing the battery and the charger, a start-stop switch for the current source, and means preventing operation of the source when the source is not in a predetermined operative position, said casing having a prismatic shape characterized by a plurality of obtusely angled edges such that when it rests on a substrate it automatically assumes, under the influence of its own weight, one of only two positions, said two positions being said operative position and a position in which the current source is inaccessible for operation.
Specification