The invention relates to a switch for an electrical device, in particular for an electrical tool, comprising a slide control for setting a rotational speed of the electrical device, a switch housing, and at least one circuit board arranged in the switch housing for holding electrical components of the slide control. According to the invention, a movably supported operating element of the slide control is inserted into a contact chamber of the switch housing in a sealed manner through a first feed-through and is led out of the contact chamber in a sealed manner through a second feed-through in all adjustment positions of the operating element. Thus, a switch that ensures reliable function even under ambient conditions of high contamination is provided.

A rechargeable battery jump starting device with a control switch backlight system. The control switch backlight system is configured to assist a user viewing the selectable positions of the control switch for selecting a particular 12V or 24V operating mode of the portable rechargeable battery jump starting device in day light, sunshine, low light, and darkness.

A rechargeable battery jump starting device with a leapfrog charging system. The leapfrog charging system, for example, can sequentially charge multiple batteries of the rechargeable battery jump starting device. For example, the rechargeable battery jump starting device is a portable rechargeable battery jump starting device configured for jump starting automobiles, heavy equipment, commercial vehicles, commercial equipment, trucks, buses, commercial trucks, front loaders, dozers, back hoes, excavators, rollers, fork lift, specialized commercial equipment, logging equipment, airplanes, jets, and other battery started vehicles and equipment.

A rechargeable battery jump starting device with a dual battery diode bridge system. The dual battery diode bridge, for example, is configured to protect against a back-charge to a first 12V battery and/or a second 12V battery after a vehicle has been jump charged to prevent damage thereto.

A dual power automatic transfer switch mechanism, including: a switch housing; a first spring; a second spring; a first pin disposed on a first movable contact corresponding to a first power supply, the first spring acts between the first pin and the switch housing; and a second pin disposed on a second movable contact corresponding to a second power supply, the second spring acts between the second pin and the switch housing; a first driving disk is configured to actuate the first pin moves between a first power-on position and a first power-off position; a second driving disk is configured to actuate the second pin moves between a second power-on position and a second power-off position; wherein the first and second driving disk are configured to rotate synchronously such that the first and the second pin cannot in the power-on position at the same time.

A rechargeable battery jump starting device and a battery frame for use in an electronic device such as a portable rechargeable battery jump starting device. The rechargeable battery jump starting device maximizes the power conducted from the rechargeable battery to a battery being jump started.

A rechargeable battery jump starting device with a dual battery diode bridge system. The dual battery diode bridge, for example, is configured to protect against a back-charge to a first battery and/or a second battery after a vehicle has been jump charged to prevent damage thereto.

The invention relates to a switch for an electrical device, in particular for an electrical tool, comprising a slide control (20) for setting a rotational speed of the electrical device, a switch housing, and at least one circuit board (30) arranged in the switch housing for holding electrical components of the slide control. According to the invention, a movably supported operating element (21.4) of the slide control is inserted into a contact chamber (12) of the switch housing in a sealed manner through a first feed-through (11) and is led out of the contact chamber in a sealed manner through a second feed-through (44.1) in all adjustment positions of the operating element. Thus, a switch that ensures reliable function even under ambient conditions of high contamination is provided.

Disclosed herein are a rechargeable battery jump starting device with a control switch (e.g. rotary control switch) and an optical position sensing switch system to determine a position of the control switch. The optical position sensing switch system includes an optical position sensor using optical coupling to insure an integrity of isolation on a 12V to 24V master switch to allow for a safe and effective operation, and configured so that a microcontroller unit reads a position on the master switch.