Clamp activated jumper cable switch
First Claim
1. A safety device for a battery, comprising:
- (a) a fixed contact electrically connected to one terminal of the battery;
(b) a movable contact adapted for attachment of an electrically conductive clamp of unknown polarity, and for being biased toward the fixed contact under the influence of the clamp;
(c) switch means biased into a safety position for electrically separating the movable and fixed contacts, and movable to an operative position for allowing the clamp to move the movable contact into electrical communication with the fixed contact; and
(d) indicating means electrically connected to a reference potential and to the movable contact for indicating whether the unknown polarity is the same as a polarity of the one terminal;
whereby a user can operate the switch to electrically connect the clamp to the one terminal when the indicating means indicates that the unknown polarity is the same as the polarity of the one terminal.
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Accused Products
Abstract
A safety device for an automobile battery has a light for indicating when jumper cables are properly attached to the battery, and a switch for electrically connecting a jumper cable attached to the device with a battery terminal. The device has a non-conductive housing supporting a fixed contact in electrical connection with one terminal of the battery by means of an integral clamp. A movable contact is formed by two metal plates on opposite sides of a head of the fixed contact, the plates being adapted to receive and be gripped between the jaws of a jumper cable clamp. The jumper cable clamp biases the plates toward the fixed contact. The device normally is in a non-conductive mode, in which the plates are prevented from moving together by one end of a lever disposed between the plates. The other end of the lever extends outside of the housing and has a handle. The lever is biased into the non-conductive position by a spring. The device also has an LED which lights when the clamp has the same polarity as the terminal to which the device is mounted. A user, in response to seeing the light, presses the handle to move the lever into a position where it moves out of the way of the plates allowing them to close against the head of the fixed contact. The lever will automatically move to the non-conductive position upon removal of the clamp. There is also an adaptor on which the device mounts when in a car with a side mount battery. In another embodiment of the invention, there is a ratchet for quickly and easily connecting or disconnecting battery terminals. The ratchet has a male or female threaded plug, and acts as a bolt or nut, respectively. The ratchet handle normally engages the plug so that the plug rotates with the handle. Tightly gripping the handle disengages the plug so that the handle rotates freely with respect to the plug.
58 Citations
30 Claims
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1. A safety device for a battery, comprising:
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(a) a fixed contact electrically connected to one terminal of the battery; (b) a movable contact adapted for attachment of an electrically conductive clamp of unknown polarity, and for being biased toward the fixed contact under the influence of the clamp; (c) switch means biased into a safety position for electrically separating the movable and fixed contacts, and movable to an operative position for allowing the clamp to move the movable contact into electrical communication with the fixed contact; and (d) indicating means electrically connected to a reference potential and to the movable contact for indicating whether the unknown polarity is the same as a polarity of the one terminal; whereby a user can operate the switch to electrically connect the clamp to the one terminal when the indicating means indicates that the unknown polarity is the same as the polarity of the one terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A safety device for a battery, comprising:
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(a) conductive means electrically connected to one terminal of the battery; (b) movable means adaptable for attachment of an electrically conductive clamp of unknown polarity and for moving into contact with the conductive means, under the influence of the clamp, to electrically connect the clamp and the conductive means; (c) switch means biased into a safety position for preventing the movable means from moving into contact with the conductive means, and movable to an operative position for allowing the clamp to move the movable means into contact with the conductive means; and (d) indicating means electrically connected to a reference potential and to the movable means for indicating whether the unknown polarity is the same as a polarity of the one terminal, whereby a user can move the switch means to the operative position to electrically connect the clamp to the one terminal when the indicating means indicates that the unknown polarity is the same as the polarity of the one terminal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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- 21. A combination of a battery and a safety device, the battery having first and second terminals, one of which is positive and one of which is negative, the safety device comprising a non-conductive housing, a fixed contact electrically connected to a first terminal of the battery, a movable contact adapted for attaching an electrically conductive clamp of unknown polarity, and for being biased toward the fixed contact under the influence of the clamp, switch means biased into a safety position for electrically separating the movable and fixed contacts and movable to an operative position for allowing the clamp to move the movable contact into electrical connection with the fixed contact, and indicating means electrically connected to a reference potential and to the movable contact for indicating whether the unknown polarity is the same as a polarity of the first terminal, whereby a user can operate the switch to electrically connect the clamp to the first terminal when the indicating means indicates that the unknown polarity is the same as the polarity of the first terminal.
- 22. A combination of a battery and a safety device, the battery having first and second terminals, one of which is positive and one of which is negative, the safety device comprising a non-conductive housing, conductive means electrically connected to the first terminal of the battery including means for mounting the housing to the first terminal, movable means adaptable for attaching an electrically conductive clamp of unknown polarity and for moving into contact with the conductive means under the influence of the clamp to electrically connect the clamp and the conductive means, switch means biased into a safety position for preventing the movable means from moving into contact with the conductive means, and movable to an operative position for allowing the clamp to move the movable means into contact with the conductive means, and indicating means electrically connected to a reference potential and to a movable contact for indicating whether the unknown polarity is the same as a polarity of the one terminal, whereby the user can operate the switch means to electrically connect the clamp to the one terminal when the indicating means indicates that the unknown polarity is the same as the polarity of the one terminal.
Specification