"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 7855344 | Reversing switch A reversing switch for use in a multi-phase electrical system, and in particular a three phase electrical system has a conductor for linking the input and output of one of the three phases. The reversing switch has two phase switches for reversing polarity. Each pha... | 12/21/2010 |
| 7414211 | Modular power hand tool A power handle module encloses rechargeable batteries which can be used to power a number of modular special-purpose tools which may be mounted to the power handle module. The power handle module includes a hand grip, a trigger switch operated by a trigger and a fir... | 08/19/2008 |
| 7288731 | Switching device A switching device (2) for a multi-step vehicle transmission (4) having one main transmission part (6) and an auxiliary-section transmission part (10) comprising the switching mechanisms (12, 14, 18, 38) for actuating switching ele... | 10/30/2007 |
| 7217896 | Staked printed circuit board terminals for switch cases A staked terminal rivet system and method configured to mount a switch device onto a printed circuit board is disclosed as an alternative to traditional molded-in or staked-on secondary terminal systems. An electrically conductive rivet functioning as a terminal red... | 05/15/2007 |
| 7210542 | Power tool safety device A safety device for a power tool having an electric motor and a trigger to activate the motor via a primary trigger-activated switch, includes an auxiliary switch in circuit with the motor, an activator movable between a first position in which the auxiliary switch ... | 05/01/2007 |
| 7148433 | Reversing switch mechanism A reversing switch mechanism includes a housing defining contact cavities and a trough, contacts received in the contact cavities, and a slide member received in the trough and engaging the contacts. The slide member includes conductive elements forming conductive p... | 12/12/2006 |
| 7138595 | Trigger configuration for a power tool A hand-held power tool with a housing with a handle arranged along an axis, a trigger disposed in the housing and configured to operate the hand-held power tool, first and second sets of guide tracks coupled to one of the housing and the trigger and first and second... | 11/21/2006 |
| 7132613 | Methods, systems, and terminals for load coil switching A method for constructing a transmission line unit such that load coils can be selectively connected to a transmission line includes providing a transmission line section having a transmission line and a plurality of load coils electrically connected thereto, and co... | 11/07/2006 |
| 7053325 | Electric power tool An electric power tool includes a housing, an electric power, a trigger, a trigger-limitation device and a switching device. The housing receives the electric power unit having an output shaft. The trigger is slidably mounted on the housing so as to control operatio... | 05/30/2006 |
| 7044235 | Pneumatic tool with settable safety function A pneumatic tool with settable safety function, including: a main body having a flow way for a fluid to flow into the main body to drive a pneumatic cylinder; a switch disposed in the main body for blocking the flow way in normal state; a trigger disposed on the mai... | 05/16/2006 |
| 7034240 | Controlling apparatus for electric tool An electric tool includes a power supply, a controlling apparatus and a two-way motor. The motor includes first and second leads. The controlling apparatus includes a first conductive element connected with the anode of the power supply, a second conductive element ... | 04/25/2006 |
| 7009128 | Side contact rocker-type switch assembly An electrical switch assembly is provided for use as a single-pole, double-throw switch. The assembly includes a housing having an interior cavity. First and second stationary contacts are positioned on one side of the interior cavity, and third and fourth stationar... | 03/07/2006 |
| 6965087 | Electric switch An electric switch, in particular for a high load, such as a power switch. The switch has a contact system comprising a movable switching contact and at least one stationary contact. A movable actuation member, when moved, interacts with the switching contact for th... | 11/15/2005 |
| 6943307 | Switching device The switching device for switching high electrical currents and voltages has at least one switch pole (1, 1′, 1″) which is operated by means of a rotatable shaft (8, 8′, 8″). Furthermore, the switching device has at least one lever system (1... | 09/13/2005 |
| 6849811 | Methods and apparatus for transfer switch A transfer switch for switching between power sources for a load includes a plurality of symmetrical phase plates, a plurality of stationary contact pads associated with each said phase plate, each stationary contact pad associated with a power source, a movable con... | 02/01/2005 |
| 6765157 | Transfer switch with improved actuator A transfer switch that includes output contacts, primary input contacts, secondary input contacts and a toggle mechanism. The toggle mechanism includes moving contacts that alternately connect the output contacts with the primary and secondary input contacts. The tr... | 07/20/2004 |
| 6749028 | Power tool trigger assembly A trigger assembly for controlling an electric power tool including a motor comprises a base for fixing within the power tool and a trigger supported by the base for inward and outward movement, the trigger being resiliently biassed outwards. The base has a housing ... | 06/15/2004 |
| 6736220 | Power tool trigger assembly A trigger assembly for controlling an electric power tool including a motor comprises a base for fixing within the power tool and a trigger supported by the base for inward and outward movement. The base has a housing, a first mechanical switch provided in the housi... | 05/18/2004 |
| 6534737 | Contact closing speed limiter for a transfer switch A transfer switch that absorbs the kinetic energy of a toggle mechanism within the transfer switch just before moving contacts on the toggle mechanism engage a set of stationary contacts. The transfer switch includes output contacts, primary input contact... | 03/18/2003 |
| 6489578 | Electrical switch An electrical switch (4), in particular for electric hand tools (1), such as electric drills, hammer drills, electric screwdrivers or the like, has an actuating member (5) that can be moved from an initial position into an operating position. In the opera... | 12/03/2002 |
| 6199642 | Reversible ratcheting power tool with synchronized motor and ratchet control A reversible ratcheting electric power tool has a reversible DC electric motor having an output coupled to drive a drive shaft through a reversible ratchet assembly. The tool housing has a reversing mechanism which includes a manually operable reversing c... | 03/13/2001 |
| 6144122 | Power tool with switch and electrical connector assemblies A switch assembly has a reversible switch with an activation member, electronics, and a plurality of contacts to couple the electronics with a power source. A connector assembly is coupled with the switch assembly contacts. The connector assembly includes... | 11/07/2000 |
| 6121557 | Pole reverser switch with moulded contacts The invention relates to a switch comprising a carrier which is manufactured substantially from plastic and in which fixed contacts are arranged, and a part which is movable relative to the carrier and in which movable contacts are arranged, wherein the f... | 09/19/2000 |
| 5955802 | Reversing mechanism for electric motors A power tool has a mechanism to reverse a motor. The mechanism includes a first member secured with the motor surrounding the motor commutator. A pair of electrical contacts are supported in the first member. A second member is rotatable on the fist membe... | 09/21/1999 |
| 5936213 | Operating mechanism for a five-pole phase inverter isolating switch An electric switch for use in a five-pole isolating switch used as a phase inverter has a fixed contact and a mobile contact cooperating with the fixed contact to open or close an electrical line. The mobile contact is moved in a longitudinal direction by... | 08/10/1999 |
| 5614701 | Control switch for electric winch A control switch for an electric winch includes a handle, a set of forward and reverse push button switches and a switch box. The switch box includes a top cover and a bottom cover. The top cover is provided with a set of polarize conducting plates for DC... | 03/25/1997 |
| 5349143 | Reversible electrical switch A reversible electric switch has movable contacts on opposite ends of a rotor adapted for interengagement with diametrically disposed pairs of stationary contacts. Intermittency or rocking of the movable contacts with respect to the stationary contacts is... | 09/20/1994 |
| 5329163 | Auto-switch for power window The present invention relates to an auto-switch which is used for a control circuit of a power window for moving automobile window glass up and down using an electric window motor, and has a manual/automatic contact, wherein the auto-switch is operably by... | 07/12/1994 |
| 5296747 | Diaphragm operated electrical polarity reversing switch A reversing switch and more particularly a diaphragm operated electrical polarity reversing switch which has general utility but in the application the reversing switch is disclosed for use in combination with a vehicle mounted spray device including a di... | 03/22/1994 |
| 5287005 | Actuator control device for automobile air conditioners An actuator control device used for, for instance, dampers of automobile air conditioners including first and second fixed contacts which are discontinuous on a path along which a movable contact travels and third and fourth fixed contacts which are also ... | 02/15/1994 |
| 5216212 | Disconnect/reversing switch A combination disconnect/reversing switch for use in explosive environments for isolating an electrical power source from a three-phase motor or for reversing the operation of a motor. The disconnect/reversing switch comprises a handle, mounting plate, fr... | 06/01/1993 |
| 5212433 | Robot emergency stop circuit A robot emergency stop circuit for bringing the robot to an emergency stop through a deadman switch installed on a teaching control device while the robot is being taught behavior patterns through the teaching control device. The deadman switch (DM1) caus... | 05/18/1993 |
| 5173591 | Electric gearshift for children's cars An electric gearshift device (10) for an electric car for children has a lever (12) which can be operated manually to give different electrical connections between an electric motor and sets of batteries, so as to achieve different running conditions. In ... | 12/22/1992 |
| 5089729 | Power tool with brush shifting and reversing switch assembly A portable, reversibly driven power tool (11) comprises a reversible motor and an assembly (17) for electrically switching the direction of motor rotation and/or for shifting the commutator brushes (99, 101) for optimizing motor performance in both the fo... | 02/18/1992 |
| 5089715 | Multiposition switch device for controlling a driving means A switch device for making a motor or the like alternate between forward reverse rotation, having a pair of switches and a control circuit. When either one of the switches is activated, the control circuit activates the motor in one or the other direction... | 02/18/1992 |
| 5084598 | Electric switch for a power tool An electric switch for a power tool, comprising: a slider slidably received in a switch casing along a longitudinal direction, a handle provided in the grip of the power tool for manually actuating the slider along the longitudinal direction; a plurality ... | 01/28/1992 |
| 5051547 | Switch mechanism for an electric power tool A switch mechanism for an electric power tool, comprising: a linear slider received in a switch case so as to be moved manually in a first direction against the biasing force of a return spring; an actuating pin carried by the linear slider so as to be mo... | 09/24/1991 |
| 4904833 | Switch device with automatic neutral point restoring position and releasably lockable nonneutral position A switch device comprising an operating knob adapted to be selectively operated according to an operational amount and permit an automatic restoring condition and an automatic locking condition, a first selector member interlocking with the operating knob... | 02/27/1990 |
| 4903318 | Electric switch system for a power tool An electric switch system for a DC motor powered power tool, comprising: a moveable block which is adapted to be manually displaced between a first position and a second position for speed control of the motor; a fixed block arranged adjacent to the first... | 02/20/1990 |
| 4894492 | Motor control variable speed reversing switch Rotary switch providing selectable forward and reverse motor speeds responsive to a single control. A rotatable shaft moves two power source contacts interdependently between a motor terminal and a bus, for two polarity conditions, or holds the contacts i... | 01/16/1990 |