Patents Assigned to D.B.A.
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Patent number: 4490102Abstract: The compressor, with rotating assemblies of low inertia, and of compact construction, comprises, housed in a housing, two hollow rotors (5, 6), for example out of plastic material, fixed respectively on a front shaft member (20, 21) journalled in a front bulkhead (26) and each supported at the rear by a rear bearing assembly (11) fixed to a rear end wall (2) of the housing and entirely contained within the internal space (7, 7) in the rotor. The drive is provided by the female rotor (6). The inner surfaces of the housing and the outer surfaces of the rotor threads are coated with an overthickened layer of an erodable coating material containing particles of a dry lubricant material.Type: GrantFiled: July 11, 1983Date of Patent: December 25, 1984Assignee: Societe Anonyme D.B.A.Inventors: Jean-Jacques Carre, Pierre Courbot, Roland Levrai
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Patent number: 4480526Abstract: The servomotor comprises a piston assembly (9) provided with a tubular hub (25) sliding on a valve sleeve (11) provided with a return roller (51) for a flexible elongate member (40) fixed between an end wall (4', 43) of the casing and an arm (47, 48) of the piston assembly normally extending beyond the return roller (51), between the latter and said end wall.Type: GrantFiled: September 2, 1983Date of Patent: November 6, 1984Assignee: Societe Anonyme D.B.A.Inventor: Jean-Jacques Carre
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Patent number: 4473137Abstract: The subject of the invention is a disc brake pad and a brake including such a pad.The disc brake pad (10) comprises two opposite sides (16, 18) including projections (24, 26) in which notches (28, 30) are formed, formed by a first part (32) and a second part (34) forming an acute angle (A) between them. The profile of the opposite sides (16, 18) is such that, for any point (P) of the second part (34), the distance between said point (P) and any part of the opposite side (16, 18), except the region of the notch (28, 30), is greater than a value (R) corresponding to the distance separating the apices of said two notches (28, 30) plus a predetermined value. The required profile of the sides is obtained by means of a portion (44) connecting said second part (34) and the corresponding side (16, 18) of the pad (10). Application to motor vehicle braking.Type: GrantFiled: April 2, 1982Date of Patent: September 25, 1984Assignee: Societe Anonyme D.B.A.Inventors: Jean-Louis Gerard, Claude Le Marchand
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Patent number: 4470432Abstract: The rotary distributor for high output flows comprises a first distribution circuit (26) which includes passages of variable cross-section, such as (60a, 61a) or (60b, 61b), in parallel, and two working pressure outlets (37, 39) connected to the two chambers of the assistance cylinder (45), and a second circuit (26A) for operation at high pressures, independent of the pressure outlets.Type: GrantFiled: January 12, 1983Date of Patent: September 11, 1984Assignee: Societe Anonyme D.B.A.Inventor: Gilbert Kervagoret
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Patent number: 4464950Abstract: The invention relates to a mechanical control by cable (10) sliding axially in a flexible sheath (12), equipped with an automatic adjustment device (40) for varying the length of the sheath as a function of the clearances appearing in the control, and of which one end (28) is connected to a receiving member (30) provided with elastic return means (36).Type: GrantFiled: November 30, 1981Date of Patent: August 14, 1984Assignee: Societe Anonyme D.B.A.Inventor: Jean Deligny
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Patent number: 4464951Abstract: The mechanical control comprises a pedal (10) pivotally mounted on a fixed shaft (12), a cable (26) having one first end (25) connected to a receiver (34) and the second end (27) connected to the pedal (10) by means of a transmission device, the transmission device comprising a force-transmitting element (22) pivotally mounted on the fixed shaft (12) and on an outer cylindrical surface (40) of which the cable (26) is wound, a locking system causing the force-transmitting element (22), the cable (26) and the pedal (10) to be connected for rotation when the latter pivots from its rest position by an angle greater than a predetermined minimum angle .alpha.m, a spring (56) being disposed between the second end (27) of the cable and the pedal (10) for tensioning the cable (26). The locking system acts by catching the cable (26) between a first catching surface (42) formed on the force-transmitting element (22) and a second catching surface (44) formed on the pedal (10).Type: GrantFiled: April 26, 1982Date of Patent: August 14, 1984Assignee: Societe Anonyme D.B.A.Inventor: Pierre Courbot
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Patent number: 4465099Abstract: A distribution apparatus of the invention comprises a distribution circuit whose passages of variable section are formed by the partial overlapping of holes of circular contour cut in a distribution element and longitudinal grooves cut in another distribution element.Type: GrantFiled: November 23, 1981Date of Patent: August 14, 1984Assignee: Societe Anonyme D.B.A.Inventor: Gilbert Kervagoret
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Patent number: 4463837Abstract: The invention relates to a spring (40) for a disc brake of the type comprising a caliper (10) mounted slidingly parallel to the axis of a rotating disc (30) on a fixed support by way of at least two axial sliding surfaces (14, 18) formed on the caliper (10) and on the fixed support and maintained elastically in contact, and two friction members (22, 24) received in anchorage and in axial sliding motion in an opening (34) in the fixed support to become frictionally engaged with the opposed faces of the disc on actuation of a brake motor (32).Type: GrantFiled: February 3, 1982Date of Patent: August 7, 1984Assignee: Societe Anonyme D.B.A.Inventor: Pierre Courbot
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Patent number: 4420988Abstract: A control arrangement is of the type comprising a control transmission chain which includes a cable (10), an actuating member such as a pedal (12) connected to one end (14) of the cable, and possibly a system of levers interposed between the other end (18) of the cable and a receiving member (28) such as a friction clutch, the flexible sheath being anchored in the vicinity of one of its ends (34) to a fixed part of a support structure (13). The end portion (36, 48) of said sheath in the vicinity of its other end (37) is mounted with the possibility of axial movement in a fixed support (38) which is fixed with respect to said support structure. A device (40) for momentary blocking of said axial movement is interposed between said end portion (36, 48) of the sheath and said fixed support (38), the blocking device (40) comprising a control member (74, 42) coupled to a point on said control transmission chain.Type: GrantFiled: November 28, 1980Date of Patent: December 20, 1983Assignee: Societe Anonyme D.B.A.Inventor: Jean Deligny
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Patent number: 4372428Abstract: The brake comprises a caliper (14) mounted for sliding on a fixed support by two axial columns (16 and 18) cooperating with bores (38, 40) formed in the caliper. The bores (38, 40) are provided with notches (42, 44) permitting the introduction of the columns (16, 18) transversely and without dismounting the latter. One of the columns (16) is equipped with a resilient sleeve (51) on which there is formed a projection (52) cooperating resiliently with the corresponding bore (38) of the caliper (14) to ensure functions of automatic recentring of the caliper and of anti-noise spring.Type: GrantFiled: October 27, 1980Date of Patent: February 8, 1983Assignee: Societe Anonyme D.B.A.Inventors: Jean Delaunay, Claude Le Marchand
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Patent number: 4365844Abstract: The correcting valve comprises two identical parallel pistons which control the opening or closing of two valves which are disposed between two inputs and two outputs of two braking circuits. Two thrust members which are subjected to a control pressure urge the pistons in the direction for opening the valves. Two reaction springs co-operate with two transmission members for urging the thrust members in the opposite direction. When the two brakes circuits are supplied, the correcting valve has an identical cut-off pressure for the two circuits. In the event of failure of one of the circuits, the transmission members come into mutual engagement, resulting in a doubling in the cut-off pressure in the circuit which is still intact. The invention is used for dual-circuit braking systems for motor vehicles.Type: GrantFiled: January 19, 1981Date of Patent: December 28, 1982Assignee: Societe Anonyme D.B.A.Inventors: Jean J. Carre, Christian Riquart
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Patent number: 4353291Abstract: Servo unit provided with an internal bracing member which is stressed upon assembly, permitting mounting thereof to a vehicle by means of only two fixing screws. The bracing member has an initial shape which is curved in a given direction, forming a clearance between the inside face of the mounting wall and two regions of the bracing member against which the screws bear. The clearance is eliminated when the bracing member is pressed against the inside face at the moment of definitive fixing of the screws with respect to the casing. The bracing member of the invention provides for better distribution over the whole of the inside face of the braking reaction forces which are applied to the casing.Type: GrantFiled: March 30, 1981Date of Patent: October 12, 1982Assignee: Societe Anonyme D.B.A.Inventor: Jean J. Hauduc
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Patent number: 4353599Abstract: The corrector comprises two identical parallel pistons which control the opening and closing of two valves located between two inlets and two outlets of two braking circuits. Two push rods subjected to a control pressure urge the pistons in the direction for opening the valves. A reaction spring cooperates with a transmission element to urge the push rods in the opposite direction. When both braking circuits are being supplied, the corrector presents an identical cut-off point for the two circuits. In the event of one of the circuits failing, the transmission element undergoes tilting which results in an unequal sharing of the reaction force and an increase in the cut-off point in the undamaged circuit.Type: GrantFiled: October 9, 1980Date of Patent: October 12, 1982Assignee: Societe Anonyme D.B.A.Inventors: Jean-Jacques Carre, Christian Riquart
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Patent number: 4334712Abstract: The Compensator is of the type in which the cut-off point is defined by measurement of the pressure of the brake liquid trapped in a pilot chamber when the latter is isolated by closure of a valve associated with a mass which is responsive to the deceleration of the vehicle and which is urged by resilient means towards a position corresponding to the opening of said valve.It is characterized in that it comprises means responsive to the braking pressure, which modify the calibration of said resilient means as a function of said pressure.The braking compensator is applicable to braking systems for motor vehicles.Type: GrantFiled: October 1, 1979Date of Patent: June 15, 1982Assignee: Societe Anonyme D.B.A.Inventors: Jean-Jacques Carre, Guy Meynier
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Patent number: 4319609Abstract: Hydraulic actuating apparatus with digital input comprising a movable output member spring biased to a neutral position and capable of moving to one or other of two working positions under the effect of opposing hydraulic means, themselves controlled by binary-type control members;To create two additional working positions for the movable output member (10), the invention provides for each of the driving means to be composed of two active areas (s.sub.1, s'.sub.1 ; s.sub.2, s'.sub.2) acting successively on the output member (10), and for the putting of the first area under pressure to be caused by one of the control members (EV.sub.1, EV.sub.2) while that of the other area is caused by the other control member provided that the output member has already completed a first displacement step in the required direction;Particular application to the control of double-acting hydraulic actuators with two rates of displacement in each direction.Type: GrantFiled: April 7, 1980Date of Patent: March 16, 1982Assignee: Societe Anonyme D.B.A.Inventor: Philippe Debrus
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Patent number: 4318627Abstract: The articulated joint consists of a spherical ball with a stem which is assembled to pivot in a housing by means of a bearing member made from plastics material having an annular flange supported by a closing washer and provided with a series of slots which subdivide it into petals arranged between the ball and the bottom of the housing. The petals are in the form of wedges and are loaded by elastic elements made of the same material as the spherical ball race and which bear on the annular flange to ensure the preloading and automatic taking up of play.Type: GrantFiled: May 15, 1980Date of Patent: March 9, 1982Assignee: Societe Anonyme D.B.A.Inventor: Gerard Morin
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Patent number: 4311083Abstract: An absolute-control numerical hydraulic actuating device with display of the output position, comprising a hydraulic jack, a distributor formed with orifices and a selector connected to the orifices in order to make the required hydraulic connections for hydraulic locking in the desired output position.According to the invention, the orifices of the distributor can be selectively connected by the selector to the active chamber of the jack in order hydraulically to lock the output positions in accordance with numerical orders supplied to the selector, and additional intermediate locking positions are created by the provision of additional rows of orifices which can be selectively connected to the high-pressure source, to the low-pressure source, or to the active chamber of the jack through a further selector.Type: GrantFiled: October 1, 1979Date of Patent: January 19, 1982Assignee: Societe Anonyme D.B.A.Inventor: Marcel Guillon
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Patent number: 4301653Abstract: The tandem master cylinder is provided with an equalizer device comprising a plunger mounted intermediate two chambers which are respectively connected to the two cavities of the master cylinder. At least one of the ducts connecting the master cylinder and the equalizer device is formed with a constriction slowing down the flow of brake fluid so as to permit a pressure buildup in one of the braking circuits, in case of failure of the other circuit, since the very start of the pedal stroke.Type: GrantFiled: October 24, 1979Date of Patent: November 24, 1981Assignee: Societe Anonyme D.B.A.Inventors: Jean-Jacques Carre, Jean-Marc Cheron
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Patent number: D266856Type: GrantFiled: November 3, 1980Date of Patent: November 9, 1982Assignee: Pentel Kabushiki Kaisha d.b.a. Pentel Co., Ltd.Inventor: Shigeo Oka
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Patent number: D271212Type: GrantFiled: March 12, 1982Date of Patent: November 1, 1983Assignee: Pentel Kabushiki Kaisha d.b.a. Pentel Co., Ltd.Inventor: Kunio Itoh