Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7567007 | Motor and method for manufacturing the motor Object of the invention is to provide an improved technique for winding a wire to form an armature winding between a commutator and an armature. Representative motor is provided with a motor with an armature having slots, a commutator, and segments on the commutator... | 07/28/2009 |
| 7406902 | Battery powered table saws A table saw includes a table for placing a workpiece thereon. A saw unit may be vertically movably supported on the table and may have a saw blade mounted thereon. A battery-driven motor may be mounted on the saw unit for rotatably driving the saw blade. A battery m... | 08/05/2008 |
| 7383893 | Electric hammer drill It is an object of the present invention to provide an effective technique to alleviate vibration in the electric hammer drill. According to the invention, representative electric hammer drill is provided with a body, a motor, a striker, a cylinder, first and second... | 06/10/2008 |
| D551046 | Portable power saw | 09/18/2007 |
| D545657 | Portable power saw | 07/03/2007 |
| 7211347 | Battery packs having improved heat radiation A battery pack (1) has a double casing structure, including an inner case (2) disposed inside an outer case (3). The inner case (2) includes a radiator plate (9) that is in contact with the side walls of battery cells (4) di... | 05/01/2007 |
| 7162792 | Device for manufacturing motor A device for manufacturing a motor is disclosed. The motors to be manufactured have a stator body including a stator of the motor, field cores that protrude from the inside surface of the stator body, pole pieces that extend from the field cores to cross with the fi... | 01/16/2007 |
| D527592 | Power wrench | 09/05/2006 |
| D526179 | Portable electric hammer drill | 08/08/2006 |
| D516504 | Battery pack | 03/07/2006 |
| 7007762 | Power tool It is an object of the present invention to provide a technique to increase efficiency of the output torque of the blushless motor to drive a power tool. A representative power tool may comprise a tool bit, a brushless motor to drive the tool bit, a battery to opera... | 03/07/2006 |
| D514910 | Portable electric driver | 02/14/2006 |
| D512961 | Battery pack | 12/20/2005 |
| D510007 | Portable electric drill | 09/27/2005 |
| D508642 | Rechargeable impact driver | 08/23/2005 |
| D506914 | Portable electric drill | 07/05/2005 |
| D505852 | Portable screw cutter | 06/07/2005 |
| D492566 | Portable electric driver | 07/06/2004 |
| D491521 | Battery charger | 06/15/2004 |
| 6735876 | Blade clamps suitable for reciprocating power tools Blade clamps (26, 110) may reliably secure blades (22) to reciprocating power tools (10). The power tools may include a reciprocating drive shaft (24) partially extending from the tool housing (12). A first end of a rod (37, 112... | 05/18/2004 |
| D487570 | Battery charger | 03/16/2004 |
| 6540545 | Portable tool motor housing with integral mount for electric components A portable electric tool which miniaturizes a mold of a motor housing, reduces the costs for manufacturing the mold, extends the life of the mold, and simplifies attachment of electric equipment to a mount part of the motor housing. A flat mount part (29)... | 04/01/2003 |
| 6537694 | Battery pack with improved heat radiation and sealing A battery pack (1) has a double casing structure, including an inner case (2) disposed inside an outer case (3). The inner case (2) includes a radiator plate (9) that is in contact with the side walls of battery cells (4) disposed within the battery pack ... | 03/25/2003 |
| 6511200 | Power tools having timer devices Power tools are taught having a motor M1, a tool 1 coupled to the motor M1 via a tool holder 2, at least one light 4 disposed proximal to the tool 1, a switch 6 coupled to the motor M1 and the light 4, the switch 6 being capable of activation by an operat... | 01/28/2003 |
| 6204641 | Battery charger and charging method A battery charger and a charging method capable of charging a battery for a short period of time while suppressing the battery temperature from rising, by incorporating in the battery charger memory a look-up table for mapping an allowable value of curren... | 03/20/2001 |
| 6075347 | Battery charger and charging method A battery charger and a charging method capable of charging a battery for a short period of time while suppressing battery temperature from rising. The current temperature of the battery is detected (in step S12) and a temperature rise is calculated from ... | 06/13/2000 |
| 6060850 | Electric motor control circuit An electric motor control circuit that prevents lowering of a motor's rotation speed when a load is applied in the case where a rotation speed is adjusted within a range that doesn't exceed a predetermined upper limit of rotation speed. When a base curren... | 05/09/2000 |
| 5931072 | Circular saw with an improved dust collector A dust collection nozzle (12) is provided through the upper blade guard 7 of a circular saw (1). The dust collection nozzle (12) includes a flared, horn-shaped dust capturing section (13) having a rectangular opening at the front end thereof, and a cylind... | 08/03/1999 |
| 5909101 | Battery charger detecting full charge of batteries using a thermostat and thermistor in a battery pack A battery charging system is disclosed for charging two different types of battery packs, a known three terminal type including batteries and a thermostat switch, and a newer four terminal type further including a thermistor for sensing battery temperatur... | 06/01/1999 |
| 5873418 | Percussive tool having a reduced impact at the start of percussive operation A percussive tool generates a reduced impact at the start of percussive operation following idling operation. The percussive tool has a cylinder containing a piston, an air chamber in front of the piston, and a striker disposed in front of the air chamber... | 02/23/1999 |
| 5870939 | Circular saw A circular saw has a table for placing a work to be cut thereon and has a saw unit slidably supported on the table by means of a slide mechanism. A slide stopper mechanism is adapted for fixing the saw unit in position in a sliding direction and has a sli... | 02/16/1999 |
| 5871059 | Mechanism for preventing idling strikes in power-driven striking tools The present invention realizes effective recoil reduction and idling strike prevention with a minimum constitution. In a tool holder (6), a thermal-resistant O-ring (22) is arranged between two steel washers (21,23) near the joint to the barrel (5). The O... | 02/16/1999 |
| 5842527 | Hammer drill with a mode change-over mechanism A hammer drill has a mode change-over mechanism including a change link with a horizontally elongated slot, an eccentric pin projecting from a mode selector switch and penetrating the slot. The change link is moved vertically by rotating the mode selector... | 12/01/1998 |
| 5839339 | Miter saw A miter saw includes a support mechanism for supporting a miter saw unit relative to a base in such a manner that the miter saw unit is both vertically and laterally pivotable. A position determining mechanism serves to selectively determine the position ... | 11/24/1998 |
| 5823085 | Miter saw A miter saw includes a miter saw for placing a work thereon, a miter saw unit having a saw blade mounted thereon, and a support mechanism for supporting the miter saw unit for rightward and leftward pivotal movement relative to the base. The support mecha... | 10/20/1998 |
| 5816378 | Claw clutch with a positioning mechanism A clutch cam (9) with mating claws (17) is fitted into the bottom end of a driven pulley (6) through which a driven shaft (10) is inserted. The clutch cam (9) has upwardly tapered guide portions (18) and slide grooves (20) formed on the inner wall thereof... | 10/06/1998 |
| 5803147 | Vertical blind To avoid entanglement when a vertical blind is opened and closed, an attachment member is secured to a lead carrier and engages with an operation shaft. The attachment member is composed of a body having a length half the width of the lead carrier, and a ... | 09/08/1998 |
| 5775441 | Power driven striking tool An airflow regulation arrangement for regulating the impact of the strikes delivered from a striking member (6) to an intermediate member (10) and a bit, thus reducing the vibration, and also for regulating the impact of recoils of the striking member (6)... | 07/07/1998 |
| 5768967 | Slide bar mounting mechanism in slide-type circular saw and method of mounting slide bars A slide-type circular saw includes a turntable rotatable relative to a base, and includes a saw unit having a saw blade mounted thereon. The saw unit is slidably movable relative to the turntable by a plurality of slide bars extending in parallel with eac... | 06/23/1998 |
| 5769657 | Attachment structure of battery pack to power-driven tools A simple attachment structure of the present invention ensures favorable connection of a battery pack with a battery holder in a power-driven tool over a long time period without causing any defective contact. A pair of side slots (47a,47b) as well as a p... | 06/23/1998 |
