Patents Represented by Attorney, Agent or Law Firm Warren Comstock
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Patent number: 6343472Abstract: A master cylinder having a body (1) pierced with a bore (100) that is partially closed by a guide ring (11). A piston (3) mounted to slide in the guide ring (11) and bore (100) to define a pressure chamber (4) within the bore (100). An inlet (2) having a filling duct (21) which connects the bore (100) with a source of hydraulic fluid having a low pressure when the piston (3) is in a position of rest. The filling duct (21) is located between a flared portion (104) of the bore (100) and a front edge (62) of a ring (6) which slides in the body (1) between the guide ring (11) and pressure chamber (4). The piston (3) and sliding ring (6) have respective a first stop (31) and a second stop (61) which allows the piston (3) to drive the sliding ring (6) along when the piston returns to a position of rest.Type: GrantFiled: November 29, 1999Date of Patent: February 5, 2002Assignee: Bosch Sistemas de Frenado, S.L.Inventor: Olivier Gault
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Patent number: 6343469Abstract: A hydraulic system (10) having a pump (12) for sequentially supplying a brake booster (14) and a steering gear (16) with hydraulic fluid to an assist in effecting a brake application and/or a steering application. The brake booster (14) has a housing (100) with a chamber (102) therein connected to a first bore (104) which retains a piston (108) connected to a master cylinder (112) and a second bore (106) which retains a control valve (114). The second bore (106) has an inlet port (118) connected to the pump (12) for receiving supply hydraulic fluid, an outlet port (120) connected to the steering gear (16) and a return port (120) connected to the pump (12).Type: GrantFiled: September 25, 2000Date of Patent: February 5, 2002Assignee: Robert Bosch CorporationInventors: William John Penninger, John Edmund Mackiewicz
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Patent number: 6327958Abstract: A brake booster and a method of assembling an output member thereof within a bore of a valve body. In this brake booster, a reaction disc engages a holder of a reaction transmitting assembly which is connected to a plunger of an input member. A guide is attached to a cylindrical head on a shaft of an output member by hooks on the end of a first plurality of legs that extend in a first direction from a cylindrical base. A second plurality of axial legs that extend from the cylindrical base in a second direction are connected to a support ring. The cylindrical base is located in the bore by the support ring being positioned on a shoulder in the valve body by a return spring such that a series of arcuate tabs on the cylindrical base urge a reaction disc retained by the cylindrical head into engagement with the holder.Type: GrantFiled: July 31, 2000Date of Patent: December 11, 2001Assignee: Robert Bosch CorporationInventors: Charles Byron Horner, Wayne Allen Hewitt
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Patent number: 6324844Abstract: A force transmission and amplification device for a brake system comprising a pedal (1) and an output rod (2) for transmitting by way of the output rod (2) an output force (F2) having a higher intensity than an input force (F1) applied to pedal (1). An input rod (3) is secured to the pedal (1) for supplying a primary piston (4) located in a first diameter (D1) of primary cylinder (5) to delimit a primary chamber (51) retaining a fluid. A second piston (6) secured to the output rod (2) is located in a second diameter (D2) of a second cylinder (7) to delimit a secondary chamber (71). The primary chamber (51) is connected to the secondary chamber (71) to immediately supply pressurized fluid which acts on the second piston (6) to develop the output force (F2).Type: GrantFiled: March 16, 1999Date of Patent: December 4, 2001Assignee: Robert Bosch GmbHInventors: Jean-Pierre Gautier, Cedric Leboisne
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Patent number: 6318081Abstract: The invention relates to a master cylinder with hydraulic reaction, comprising a working chamber (12) in which there slides, under the action of a pushrod (50), a hollow main piston (13) inside which a reaction piston (14), itself moved by a plunger (80), delimits a reaction chamber (15) which communicates with the working chamber (12), a prestressed spring (16) offering resistance to a movement of the reaction piston (14) in the opposite direction (X+X−) from its actuating direction (X−X+). According to the invention, a sliding ring (18) is arranged opposite the plunger (80) so that actuation of the reaction piston (14) by the plunger (80) is also accompanied by compression of the spring (16).Type: GrantFiled: November 29, 1999Date of Patent: November 20, 2001Assignee: Bosch Sistemas de Frenado, S.L.Inventor: Juan Simon Bacardit
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Patent number: 6305166Abstract: A hydraulic-reaction master cylinder (2) having a working chamber (12) in which slides a hollow main piston (13) with a bore (130) therein which retains a reaction piston (14) to define a reaction chamber (15). The reaction chamber (15) has an annular shape and communicates with the working chamber (12) through at least one non-return valve (22) or an axial passage (23). The axial passage (23) is closed off selectively an axial stub (141) that extends from the reaction piston (14).Type: GrantFiled: December 6, 1999Date of Patent: October 23, 2001Assignee: Bosch Systemes de FreinageInventors: Carré Jacques, Cédric Leboisne
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Patent number: 6302011Abstract: A brake booster (12) having a housing (14,16) with a control valve (70) located in an axial bore (54) of a hub (50) carried by a movable wall (22,24). The movable wall (22,24) separates the interior of the housing into a first chamber (26,26′) and a second chamber (28,28′). The control valve (70) in a first mode communicates the first chamber (26,26′) with the second chamber (28,28′) to provide for equal pressures therein and in a second mode communicates the second chamber (28,28′) with a surrounding environment to create a pressure differential across the movable wall (22,24). A reaction member (96) carried by the movable wall (22,24) communicates an operational force created by the pressure differential into an output push rod (94).Type: GrantFiled: May 30, 2000Date of Patent: October 16, 2001Assignee: Robert Bosch CorporationInventor: Charles Byron Horner
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Patent number: 6299114Abstract: A method of attaching a spring (5) to a brake pressure equalizing device (6) by securing a clamping collar (2) to an attachment bar (1) of a vehicle. The attachment bar (1) has a circular section which connected to a flat (11,12) whereas the clamping collar (2) is an open and deformable ring (20) created by a first lug (21) being joined to a second lug (22). A profiled insert piece (4) has an internal shape which matches the profile of the circular section and flat of the attachment bar and an external shape which matches the deformable ring (20) is inserted between the attachment bar (1) and deformable ring (20). A nut (31) is connected to a screw (3) that extends between the first lug (21) and the second lug (22) and the spring is attached to the second lug (22) and brake pressure equalizing device (6). The clamping collar (2) is rotated on the profile insert piece (4) until a desired tension is achieved in the spring (5).Type: GrantFiled: November 29, 1999Date of Patent: October 9, 2001Assignee: Robert Bosch GmbHInventors: Jean-Marc Kientz, Alain Perrin
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Patent number: 6295919Abstract: A braking device having a flange (21) of master cylinder (2) secured to a pneumatic booster (1) by a nut (3) screwed onto a through-bolt (13) that extends through a front shell (111) and a rear shell (112). The through-bolt (13) has a threaded front end (131) and a shoulder (132) for holding a front wall (111) in alignment with the master cylinder (2). The nut (3) has a barrel engaged in a hole (211) in the flange (21) and is screwed onto the front end (131). A collar (32) on the nut (3) acts on the flange (21) to press the flange (21) against the front shell (111). The barrel (31) of the nut and shoulder (132) of the through-bolt (13) have first and second respective sections (S1, S2) which face each which engage the front shell (111) with the first section (S1) being larger than the second section (S2) such that the front shell (111) crumples on receipt of a impact force.Type: GrantFiled: November 29, 1999Date of Patent: October 2, 2001Assignee: Robert Bosch GmbHInventor: Cédric Leboisne
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Patent number: 6295916Abstract: A brake booster (12) having a housing (14,16) with a control valve (70) located in an axial bore (54) of a hub (50) carried by a movable wall (22,24). The movable wall (22,24) separates the interior of the housing into a first chamber (26,26′) and a second chamber (28,28′). The control valve (70) in a first mode communicates the first chamber (26,26′) with the second chamber (28,28′) to provide for equal pressures therein and in a second mode communicates the second chamber (28,28′) with a surrounding environment to create a pressure differential across the movable wall (22,24). A reaction member (96) carried by the movable wall (22,24) communicates an operational force created by the pressure differential into an output push rod (94).Type: GrantFiled: May 30, 2000Date of Patent: October 2, 2001Assignee: Robert Bosch CorporationInventor: Charles Byron Horner
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Patent number: 6280002Abstract: A hydraulic brake system wherein a portion of a volume of a first fluid supplied to a steering system by a pump is selectively diverted to an actuator assembly for a master cylinder to develop an force for actuating a master cylinder to pressurize fluid which is supplied to wheel brakes. An electronic control unit (ECU) for the brake system receives a first input signal indicative of the flow of fluid from the pump in the steering system, a second input signal indicative of the input force applied by the operator and a third input signal indicative of the speed of the wheels of the vehicle for developing a pulse modulated operational signal. The electronic control develops an operational signal which is supplied as the pulse modulated operational signal to a magnetic responsive valve. The pulse modulated operational signal creates a variable orifice in the magnetic responsive valve to restrict the flow of the first fluid to the steering gear and increases the fluid pressure of the first fluid.Type: GrantFiled: January 28, 2000Date of Patent: August 28, 2001Assignee: Robert Bosch CorporationInventors: Gregory Paul Goodzey, Bryan Frances Heinz, Timothy Jay Albert
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Patent number: 6276765Abstract: A secondary source of braking for large hydraulically braked vehicles utilizing the available power source (38) provided by typically available anti-skid and traction control braking systems. The anti-skid braking system is used to control the secondary braiding function in a manner optimal to the operating condition of the vehicle. Unique distinctive operating modes are used when the vehicle is either moving (79, 81, 83), or stationary (57, 59, 73). The advantages of the stationary mode are fast time response and high output pressure controlled with a minimum of pump operation and fluid movement. The advantages of the dynamic mode are the ability to modulate brake pressure in response to the driver's command.Type: GrantFiled: November 9, 1999Date of Patent: August 21, 2001Assignee: Robert Bosch CorporationInventors: Kenneth Scott Towers, Timothy Jay Albert, Gregory Paul Goodzey
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Patent number: 6269731Abstract: A pneumatic booster operated by a plunger (8) located in a piston (5) with a rear section (82) which operates a valve (91,92,93) to develop a force on the piston (5) to apply a boost force to force-transmission members (12,14). The plunger (8) has a first section (81) connected to the rear section (82) by a spring (15). The front section (81) and the force-transmission members (12,14) defining a retention assembly (16,17) for securing the front section (81) to the piston (5) when a boost force exceeds a predetermined threshold while the plunger (8) is in a maximum actuating position to allow for extended actuation of the booster following a sharp braking action.Type: GrantFiled: May 19, 1999Date of Patent: August 7, 2001Assignee: Robert Bosch GmbHInventors: Jean-Pierre Gautier, Cedric Leboisne, Ulysse Verbo, Raphael Medina, Philippe Richard
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Patent number: 6250431Abstract: A method to retain a minimum running clearance between the friction pads associated with a caliper of a brake and a rotor attached to a wheel of a vehicle. A bearing member associated with the wheel includes a plurality of rollers which axially move about a reference point to allow the rotor to correspondingly move and retract the friction pads of the caliper when the vehicle is subjected to centrifugal forces. This retraction of the friction pads by movement of the rotor creates a minimum running clearance between the rotor and friction pads on termination of the radial forces. A desired running clearance is reestablished during a brake application.Type: GrantFiled: March 1, 2000Date of Patent: June 26, 2001Assignee: Robert Bosch CorporationInventor: Michael E. Dunn
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Patent number: 6234278Abstract: An anchor plate for a brake assembly and a method of attachment to an annular rib of axle tube of a vehicle. The anchor plate which defines a backing plate for a drum brake and guide rails for a caliper of a disc brake has a flange with a keyhole having with an arcuate length approximately equal to an axle retained in the axle tube. In assembly, the anchor plate is moved in an angled plane toward the axle until the keyhole moves past the axle. The anchor plate is rotated into radial alignment with axis of the axle and the flange is aligned with the axle tube. Then the flange is axially moved onto the axle tube until the flange engages the annular rib. Bolts are located in holes in the flange to fix the anchor plate to the axle tube. Thereafter, a bracket is attached to the anchor plate to position a cantilever member which retains a cable sheath is aligned with a lever opening in the anchor plate.Type: GrantFiled: December 20, 1999Date of Patent: May 22, 2001Assignee: Robert Bosch CorporationInventors: Philip Ingmar Loken, Robert Lee Wagner, Steven Arthur Lemaire
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Patent number: 6234281Abstract: A parking brake having first and second brake shoes with a first end engaging an anchor post on a backing plate and a second end engaging an adjuster. An actuator located adjacent the anchor post has a first end that engages a first web on the first brake shoe and a second end the engages second web on the second brake shoe. A brake cable is connected to the actuator assembly for providing a force for moving the first and second brake shoes into engagement with the drum to effect a brake application. The actuator is characterized by a housing having first and second spaced apart walls with a first end and a second end. The first and second ends each have first and second ears with the first and second ears on the first end being joined together adjacent a central plane mid-way between the first and second side walls to establish a first slot that receives the first web.Type: GrantFiled: November 7, 2000Date of Patent: May 22, 2001Assignee: Robert Bosch CorporationInventors: William Eugene Sherman, II, Ronald Joseph Ackerman
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Patent number: 6213258Abstract: A drum brake having an adjustable-length strut (6) to compensate for clearance due to wear between first (21a) and second (22a) friction members and a drum (1). The adjustment being achieved by the rotation of a toothed wheel (7) driven by an adjustment blade (51) mounted on a rocking lever (5). The rocking lever (5) has an inhibitor blade (52) which intercepts the toothed wheel (7) whenever a risk of excessive adjustment occurs by disengaging the adjustment blade (51) from the toothed wheel (7). The inhibitor blade (52) prevents subsequent rotation of the toothed wheel (7) until the risk of excessive adjustment dissipates.Type: GrantFiled: September 24, 1999Date of Patent: April 10, 2001Assignee: Robert Bosch GmbHInventor: Vincent Dupuis
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Patent number: D440581Type: GrantFiled: July 31, 2000Date of Patent: April 17, 2001Assignee: Robert Bosch CorporationInventors: William Eugene Sherman, II, Randall Michael Zonca, Timothy James Posey, David Thomas Sadanowicz
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Patent number: D446757Type: GrantFiled: October 12, 2000Date of Patent: August 21, 2001Assignee: Robert Bosch CorporationInventor: Wallace Jacob Kronewitter
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Patent number: D454476Type: GrantFiled: August 31, 2001Date of Patent: March 19, 2002Assignee: S-B Power Tool CompanyInventor: Robert H. Bruno