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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7290964 | Drilling/tapping/unscrewing apparatus A drilling/tapping/unscrewing apparatus including a transmission shaft of a power source on which a drilling ratio gear, a tapping ratio gear and an unscrewing ratio gear are mounted for transmitting the power of the power source to a bit. The apparatus further incl... | 11/06/2007 |
| 7261499 | Adjustable drill microstop with multiple offset depth settings An adjustable drill microstop apparatus is employed with a drill and a drill bit to limit the depth of a hole drilled into an object surface by the drill bit. The apparatus has a housing and a nose piece that is mounted for reciprocating axial movement in accordance... | 08/28/2007 |
| 7192004 | Electric driving device for a valve An electric driving device for a valve includes a lower casing member, a cover plate, a driving unit, a cylindrical part, a control part, a third rod and a fourth rod. The cover plate closes the open top of the lower casing member. The driving unit has an electric m... | 03/20/2007 |
| 7140151 | Electro-mechanical actuator An electro-mechanical actuator for a window lift mechanism including a plurality of motors for driving an output shaft. The actuator may be incorporated into a window lift mechanism including a dual rack and pinion assembly, for driving the pinions along the racks. ... | 11/28/2006 |
| 7008151 | Power driver having geared tool holder A power driver includes a motor and a spindle having a distal end thereof opposite the motor. The distal end has an axial bore formed therein. A gear assembly is disposed operatively between the motor and the spindle so that the motor rotationally drives the spindle... | 03/07/2006 |
| 6942435 | Machine tool A machine tool, particularly a hand machine tool, including an indexing mechanism which is switchable by an actuating element via at least one coupling element, and including at least one spring element arranged in the flux of force between the actuating element and... | 09/13/2005 |
| 6438813 | Rotary drive with a speed A rotary drive adapted to perform a speed of rotation switching of a tool holding device, comprising an output drive shaft bearing the tool holding device, said output drive shaft being able to be moved into first and second axial positions by means of a ... | 08/27/2002 |
| 4789274 | Boring apparatus A boring apparatus has a rotary member rotated by a motor, a transmission shaft transmitting its rotation to an electric drill by means of a rotation transmission mechanism for reciprocally moving the electric drill on the frame of the apparatus. The tran... | 12/06/1988 |
| 4757598 | Two speed transmission for power driven threading machine A transmission is disclosed for rotating the work supporting chuck assembly of a power driven threading machine at low and high speeds. The transmission includes a sun gear, a ring gear coaxial with the sun gear and axially shiftable between first and sec... | 07/19/1988 |
| 4710071 | Family of electric drills and two-speed gear box therefor A two-speed gear box for handheld electric drills and the like has the movable parts associated with gear changing on or associated with a lay shaft. Gear changing is preferably effected by moving a pair of dogs, slidably mounted in holes through a lay sh... | 12/01/1987 |
| 4701082 | Multipurpose machining unit In a multipurpose machining unit with pneumatic spindle feed, driving is performed, starting from a motor unit (12), directly or via a flexible shaft (9). An interchangeable gear set (4) makes it possible to select the number of revolutions of the tool in... | 10/20/1987 |
| 4641551 | Apparatus for translating rotational motion and torque The present invention provides apparatus which can be incorporated into a powered instrument that rotates a tool at varying rotational speeds and torques. The invention includes at least two drive plates, each of which rotates at a different speed and whi... | 02/10/1987 |
| 4123192 | Tapping attachment for a machine tool A tapping attachment for a machine having at least one rotating workpiece spindle and associated coaxial tool drive shaft. The tapping attachment couples a tapping tool to the drive shaft in a manner selectively controlling the tool to rotate with respect... | 10/31/1978 |
| 4083646 | Positive feed drill with rapid advance A portable positive feed drilling device in which there is a spindle carrying a cutting tool with means for rotating the spindle and the cutting tool in order to perform a cutting operation on the work, and in which there is a normal speed spindle feed me... | 04/11/1978 |
| 4008647 | Machine tools There is disclosed a spindle unit for machine tools in which the spindle is rotated by a change speed mechanism comprising a drive sleeve splined and slidable axially in the spindle and a gear shift sleeve slidable with the drive sleeve and having a bull ... | 02/22/1977 |
