Circumferential Brush Shifting On Reversal Patents (Class 310/230)
  • Patent number: 10843321
    Abstract: A power tool includes a tool body, a motor, a handle part, and an elastic member. The tool body extends along the driving axis in the front-rear direction. The motor has a motor shaft. The motor shaft is rotatably supported by the tool body and extends in the front-rear direction. The handle part includes a grip part. The grip part extends in a direction crossing the driving axis. The elastic member is interposed between a rear end portion of the motor shaft and an inner wall surface of the handle part. The elastic member biases the motor shaft and the handle part away from each other in the front-rear direction.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: November 24, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Keita Mori, Masanori Furusawa
  • Patent number: 10179400
    Abstract: A power tool includes a motor, a driving mechanism, a body housing, a handle, and a rear position defining member. The driving mechanism is driven by the motor and configured to drive a tool bit in a longitudinal direction. The body housing houses the motor and the driving mechanism. The handle is connected to the body housing so as to be allowed to move with respect to the body housing between a front position and a rear position in the longitudinal direction, while being biased by a biasing member in the longitudinal direction. The handle includes a handle base and a handle cover. The rear position defining member extends from the body housing to a position between the handle base and the handle cover in the longitudinal direction and is configured to define a rear position of the handle.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: January 15, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Masanori Furusawa, Kei Watanabe
  • Patent number: 9071119
    Abstract: A device for reversing the direction of rotation and/or for adjusting the carbon brushes for a reversible electric motor, in particular for an electric hand tool, with a base and with a mount, which is mounted pivotably on the base and on which brushholders for the carbon brushes wiping over the collector of the electric motor are arranged. The electric motor can be driven by means of power electronics, such as a pulse width controller, a phase gating controller, a phase chopping controller or the like. The power electronics are arranged on the base and/or on the mount. The device furthermore has fixed contacts and switching contacts, which interact with alternate contact-making for reversing the direction of rotation of the electric motor as the mount is pivoted.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: June 30, 2015
    Assignee: Marquardt GmbH
    Inventors: Andreas Fuchs, Klaus Fiederer, Lars Girsberger, Emiliano Villanova
  • Patent number: 7141906
    Abstract: Devices and methods of use for brush holders are disclosed. A brush holder assembly including a brush catch and a brush release is disclosed. Also illustrated is a brush holder assembly including a first portion in sliding engagement with a second portion. Sliding engagement of the first portion with the second portion may selectively engage and/or disengage a brush catch with a brush. In some embodiments the brush catch is disengaged from the brush when the brush holder is in a locked position and is engaged with the brush when the brush holder is in an unlocked position. Methods and devices for selectively placing a brush holder in a locked or unlocked position are also disclosed.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: November 28, 2006
    Assignee: Cutsforth Products, Inc
    Inventors: Robert S. Custforth, David L. Cutsforth
  • Patent number: 5160868
    Abstract: An adjustable-brush motor incorporates an integral stepping motor or servo to electromechanically adjust the commutating angle of the primary brushes by input of an electrical signal, and to maintain a predetermined commutating angle in the absence of an electrical signal. The adjustment is in accordance with load changes to reduce sparking, to upgrade the electromechanical conversion efficiency of the motor, and to reverse the direction of rotation.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: November 3, 1992
    Inventor: Tai-Her Yang
  • Patent number: 4823037
    Abstract: A DC electric motor which comprises: a reversibly rotatable rotor having an armature core, an armature winding and a commutator; a stator having a yoke and a plurality of field poles provided on an inner circumference of the yoke and each having a permanent magnet and an auxiliary pole; and brush means including a plurality of brushes arranged to be slidably electrically conductively in contact with the commutator; in which the auxiliary pole of each of the field poles is disposed at an exit side of the field pole in the normal foward rotating direction of the rotor; each of the brushes is held movably between a first position corresponding to a position near a geometrically neutral point between a pair of adjacent field poles and a second position corresponding to a position separated at the maximum by an electrical angle of 90 degrees from the geometrically neutral point reversely to the normal rotating direction, and each of the brushes is fixed in the vicinity of the second position in normal use.
    Type: Grant
    Filed: October 28, 1987
    Date of Patent: April 18, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Toshimi Abukawa, Kazuo Tahara, Noriyoshi Takahashi, Toshio Tomite
  • Patent number: 4791331
    Abstract: The contact surface (8') is constantly urged against the commutator (9) by spring means. The brush material is progressively worn away, without changing the shape of the contact surface (8'), owing to the rotation of the commutator (9). A cylindrical slot (17) separates the outer portion (5') of the brush body (5) from the inner portion (5b) thereof. Thus, the contact surface (8') is kept separated from the cylindrical portion (16') of the outer surface of the brush body as long as the brush material is not worn away to reach the merging zone of the portions (5a) and (5b) of the brush body. This allows a substantial limitation of the risk of sparking between the brush body and the commutator to be achieved, thus avoiding deposit of a carbon layer onto the peripheral surface of the commutator.
    Type: Grant
    Filed: April 14, 1987
    Date of Patent: December 13, 1988
    Assignee: Portescap
    Inventor: Jean-Claude Girardin
  • Patent number: 4748353
    Abstract: A hand machine tool for clockwise and counterclockwise rotation includes a universal electric motor and a reversing switch. The reversing switch is comprised of a contact plate and a contact holder both provided with coupling elements for coupling the contact plate and the contact holder for limited relative rotation. The coupling elements of the contact plate and the contact holder enclose a dust-sealed chamber in which contacts are accommodated.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: May 31, 1988
    Assignee: Robert Bosch GmbH
    Inventors: Klaus Klingenstein, Werner Rieker, Gunter Schaal
  • Patent number: 4539500
    Abstract: A commutator motor specifically designed for incorporation into portable machine tools such as a hand drill includes a stator winding in a machine housing, and a rotor winding including a rotor shaft with a commutator ring journalled in the housing. Electrical connection between the commutator and current supply is ensured by multiple pairs of diametrically opposed carbon brushes of opposite polarity, the brushes being supported in the machine housing such that each respective pair of brushes can be separately brought into contact with the commutator by a setting means capable of engaging the respective pairs of brushes. Various holder configurations for supporting the brushes include sliding cams.
    Type: Grant
    Filed: February 18, 1983
    Date of Patent: September 3, 1985
    Assignee: Skil Nederland B.V.
    Inventors: Jan P. Houben, Antonie J. Moolenaar
  • Patent number: 4536669
    Abstract: A d.c. motor comprises a cylindrical yoke, at least one set of field magnets of permanent magnets fixed to the inner peripheral surface of the yoke, an armature wound with armature windings so as to be surrounded by the field magnets, a commutator firmly mounted on a rotary shaft of the armature, a set of brushes being in slide-contact with the commutator, and a displacing means for shifting the position at which the brushes are made in slide-contact with the commutator in the counter direction of the rotation of the armature depending on rise in temperature of the d.c. motor.
    Type: Grant
    Filed: June 13, 1984
    Date of Patent: August 20, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Akira Morishita
  • Patent number: 4523116
    Abstract: Two pairs of contact strips are mounted on the respective bridge members of an integral web portion of the molded field case of a power tool or other motor-driven device. The forward ends of the contact strips are cantilever-mounted and automatically engage the respective terminals on the field, as the field is inserted into the field case and is secured in it. An annular wire harness is mounted on the rear bearing boss of the field case. Spaced contacts are carried by the wire harness and engage the respective ends of the first pair of contact strips. The respective ends of the second pair of contact strips are connected to terminals on the ends of the brush shunts. In a reversing embodiment, a third pair of contact strips is mounted on the bridge, and a rotatable reversing subassembly is mounted on the rear bearing boss in lieu of the wire harness.
    Type: Grant
    Filed: March 31, 1983
    Date of Patent: June 11, 1985
    Assignee: Black & Decker, Inc.
    Inventors: John E. Dibbern, Jr., Gregory E. Moores
  • Patent number: 4516047
    Abstract: A reversible electric motor has two pairs of brushes, a separate pair for each direction of rotation. The mean diametrical positions of the two pairs are fixed with respect to the motor's stator and angularly offset. The brushes of the one or the other pair, exclusively, are selected for application against the commutator as a function of the selected direction of rotation. Preferably a rotatable cam is arranged to lift the brushes of the non-selected pair from the commutator and insulating segments are inserted between the lifted brushes and the commutator. To simplify wiring, adjacent brushes, one from each pair, may be electrically connected together. Both pairs of brushes may advantageously be lifted from the commutator during motor reversal to eliminate risk of short-circuiting the commutator and also to interrupt supply of power thereto.
    Type: Grant
    Filed: April 18, 1984
    Date of Patent: May 7, 1985
    Assignee: Black & Decker, Inc.
    Inventor: Jean Duverger
  • Patent number: 4507565
    Abstract: Described is a method of starting an electric starting motor for an internal combustion engine. The motor shaft has a pinion at the shaft end for meshing with a ring gear provided to the engine. The pinion is shifted by a shift lever into a position meshing with the ring gear, after which the starting motor is excited for causing rotation of the ring gear and thereby starting the engine. According to the invention, until the time the pinion engages the ring gear, brush means of the starting motor are shifted away from the electrically neutral axis towards pole sides of the permanent magnet of the motor where the main magnetic field produced by the magnet is strengthened by the armature-reaction magnetic fluxes. After the pinion is engaged with the ring gear, said brush means are returned again to their positions on said neutral axis.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: March 26, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Isao Hamano
  • Patent number: 4401908
    Abstract: A motor with a commutator, for example a traction motor, comprising brush-holders mounted on a ring adapted to rotate to bring them one by one opposite an inspection gate. The connection between these brush-holders and the fixed circuits is ensured by a system of split rings contacting on a blade, these rings being of clearly different diameters so that they are separated from one another except at their point of fixation. The supports of the brush-holders, the rings and the blades are identical and comprise a flat metal core with insulating coating working solely in compression.
    Type: Grant
    Filed: February 25, 1982
    Date of Patent: August 30, 1983
    Assignee: Societe L. Ferraz
    Inventor: Louis Cabaussel
  • Patent number: 4399384
    Abstract: A rotor for a D.C. electric motor is disclosed, in which the rotor has a frontally arranged collector on which brushes are active, which are oriented parallel to the rotor axis. This arrangement considerably reduces the diametrical bulk of the motor. The brush angle is adjustable by means of an annular ring, internally threaded to the yoke.
    Type: Grant
    Filed: September 10, 1980
    Date of Patent: August 16, 1983
    Inventor: Guido Lucherini
  • Patent number: 4342931
    Abstract: A portable electric tool with a housing having a motor compartment and a pistol grip handle is provided with a trigger-switch, incorporating a motor reversing switch, mounted in the handle. An elongated lever is pivoted intermediate its length and contained within the housing. The rear end of the lever is connected to the reversing switch for actuation thereof. The forward end of the lever has a downwardly projecting protrusion which engages in a slide member which is slidable along an arcuate slot in the lower wall of the motor compartment for pivoting the lever. Intermediate the forward end of the lever and the pivotal axis of the lever is a downwardly projecting pin which coacts with a partition and two grooves in the upper part of the trigger-switch to block the movement of the trigger until the lever has been pivoted to actuate the reversing switch, and also to prevent pivoting of the lever while the trigger is in an inward position energizing the tool.
    Type: Grant
    Filed: January 29, 1981
    Date of Patent: August 3, 1982
    Assignee: Black & Decker Inc.
    Inventors: Horst Grossmann, Alfred Bausch
  • Patent number: 4338536
    Abstract: A motor or generator of the direct current type includes a stator carrying permanent magnets that is rotatable between first and second operational positions. A rotor having a winding and cooperating with a commutator is rotatable in either direction. The orientation of the magnetic field with respect to the commutator, as determined by the position of the stator, establishes the direction of rotation. If the stator is off-center when the rotor winding is energized, the stator will move to one of its operational positions under the force of a reaction torque.
    Type: Grant
    Filed: September 20, 1979
    Date of Patent: July 6, 1982
    Inventor: William M. Hallidy
  • Patent number: 4308480
    Abstract: Electromagnetic or solenoid means responsive to load current to automatically shift the brushes of a motor or generator a proper amount so as to maintain satisfactory commutation from light to full load, the brush shifting means including electric solenoid means carrying machine load current, movable brush holding means mounted on antifriction bearings, and mechanically connecting the electric solenoid means mounted on a machine frame means to brush holder means so as to shift brushes in conformity to changing load conditions.
    Type: Grant
    Filed: February 7, 1980
    Date of Patent: December 29, 1981
    Inventor: Warren E. Moody
  • Patent number: 4095155
    Abstract: A direct current motor which includes a stator for producing a fixed magnetic field and a plurality of armature windings. The motor is caused to rotate by applying current to each winding only while that winding is passing through a zone in a given orientation relative to the stator field. The direction of rotation is changed without changing the direction of the current applied to the windings, by changing the orientation of the zone relative to the stator field, to reverse the direction of the rotational force applied to the armature. Because the current does not reverse through the armature windings, the control circuit can be simple and in a preferred embodiment includes only two gate-turn-off silicon controlled rectifiers, a switch, and a resistor.
    Type: Grant
    Filed: November 10, 1975
    Date of Patent: June 13, 1978
    Assignee: RCA Corporation
    Inventors: Ronald Robert Brooks, Jack Edward Wojslawowicz