Patents Assigned to Tokico Ltd.
  • Patent number: 5887955
    Abstract: A dual function brake fluid control apparatus is presented for performing antiskid operation as well as another control operation involving control of the fluid pressure when the apparatus is not performing an antiskid operation. The apparatus is provided with a pressure relief valve having a valve body and a piston. The relief valve is forced closed by a biasing spring acting on a valve body, and when in the open state relieves the discharge pressure of a pump to the intake side of the pump. The piston closes the relief valve when the fluid pressure from the master cylinder exceeds a specific value. This configuration allows setting the discharge fluid pressure of the pump to apply fluid pressure to the wheel cylinders for non-antiskid control operations higher than that for the antiskid control operation.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: March 30, 1999
    Assignee: Tokico Ltd.
    Inventors: Hiromi Ando, Kenji Sano, Satoru Suga
  • Patent number: 5884548
    Abstract: A brake booster includes a housing, a partition adapted to divide the interior of the housing into two chambers, and two diaphragms adapted to divide the two chambers into constant and variable pressure chambers. A control valve includes a valve body carried by the diaphragms, and a plunger slidably received in the valve body. The control valve is operatively connected to the variable pressure chambers to develop a pressure differential across the diaphragms to cause the diaphragms to move in response to actuation of an input rod. A reaction disk is disposed between an output rod and the valve body to transmit the reaction of movement of the output rod to the input rod. An adjusting mechanism is disposed between the plunger and the reaction disk and compressible so as to develop a greater degree of pressure differential when a force applied by the input rod exceeds a predetermined level.
    Type: Grant
    Filed: April 1, 1997
    Date of Patent: March 23, 1999
    Assignee: Tokico Ltd.
    Inventors: Hiromi Ando, Kiyoshi Shirahata, Mitsuhiro Endo, Atsuya Koshu
  • Patent number: 5873296
    Abstract: A booster apparatus of a vacuum type for a brake device has a housing including therein a chamber, a diaphragm for dividing the chamber of the housing into a constant pressure chamber and a variable pressure chamber, an input shaft including a distal end, an output shaft including a proximal end, a plunger which is engageable with the distal end of the input shaft for transmitting force from the input shaft to the output shaft, a reaction disk disposed between the plunger and the proximal end of the output shaft for transmitting reaction from the output shaft to the plunger, and a valve body mounted on the diaphragm. The valve body includes a hole for slidably receiving the plunger, a recess for fixedly receiving the reaction disk and the proximal end of the output shaft which recess is larger than the plunger hole in inner diameter, and an intermediate hole portion disposed between the plunger hole and the recess.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: February 23, 1999
    Assignee: Tokico Ltd.
    Inventors: Kiyoshi Shirahata, Mitsuhiro Endo
  • Patent number: 5816107
    Abstract: A swinging base 12 is provided on top of a stationary base 11 such as to be capable of rotating by means of a bearing 13. A reduction gear 15 is provided in a depression portion 14 formed on the top surface of the stationary base 11. A motor 16 having a rotational shaft 17 connected to the reduction gear is provided on the swinging base. A cable support portion 21 which is rotatably supported by means of a bearing 18 provided on an axis A is provided inside the stationary base 11. The cable support portion 21 supports cables C. A through hole 23 is formed in the bottom of the swinging base 12. An arcuate aperture portion 24 is formed in the stationary base 11. The cables C are passed through the aperture portion 24 and the through hole 23. With this invention, cables which are installed in industrial robots can be supported without receiving excessive forces.
    Type: Grant
    Filed: November 18, 1996
    Date of Patent: October 6, 1998
    Assignee: Tokico Ltd.
    Inventors: Shingi Takahashi, Seiji Matsumoto
  • Patent number: 5813843
    Abstract: In the scroll-type fluidic machine according to the present invention, a slider is slidably disposed between a casing and a rear surface of a orbiting scroll member, and a sliding movement of the slider relative to the casing and the orbiting scroll member is regulated to two (X-axis and Y-axis) directions by means of X-axis and Y-axis guides. Balls received in through holes of the slider are formed from material harder than that of the slider and are rollingly contacted with a slide surface of a flange portion of the casing and a slide surface of a rear plate of the orbiting scroll member. The through holes are filled with grease. The balls are adapted to roll smoothly, thereby greatly decreasing frictional resistance between surfaces of the slider and the slide surfaces of the casing and the orbiting scroll member.
    Type: Grant
    Filed: June 11, 1997
    Date of Patent: September 29, 1998
    Assignee: Tokico Ltd.
    Inventors: Kazutaka Suefuji, Yuji Komai, Yoshio Kobayashi, Hiroyuki Mihara, Toshitugu Suzuki
  • Patent number: 5803723
    Abstract: A wrap of an orbiting scroll member and a wrap of a fixed scroll member are each provided with a non-rigid surface coating layer having a predetermined thickness. An orbiting radius varying mechanism is provided between a driving shaft and the orbiting scroll member, thereby gradually increasing the orbiting radius of the orbiting scroll member at the initial stage of running, and thus positively allowing the surface coating layers to wear by rubbing against each other. A stopper mechanism is provided between the driving shaft and the orbiting scroll member to regulate the rotation angle of a variable crank relative to the driving shaft to a predetermined rotation angle, thereby preventing the surface coating layers from being excessively worn as the orbiting radius of the orbiting scroll member increases.
    Type: Grant
    Filed: November 14, 1996
    Date of Patent: September 8, 1998
    Assignee: Tokico Ltd.
    Inventors: Kazutaka Suefuji, Yuji Komai, Yoshio Kobayashi, Hiroyuki Mihara
  • Patent number: 5802486
    Abstract: A suspension control system for a vehicle enables excellent ride quality and excellent running stability to be obtained even when the vehicle is running on a bad road. When a road surface condition judging circuit judges that the vehicle is running on a bad road, a damping coefficient preferential setting circuit preferentially sets the compression-side damping coefficient of a damping coefficient varying type shock absorber to a predetermined large value, and consequently sets the extension-side damping coefficient to a small value. Thus, the ride quality is prevented from being degraded by control delay. Further, uncontrollable movement of non-suspended members is effectively suppressed, and thus the condition of contact between the wheels and the ground is improved. Accordingly, even if the vehicle is steered during running on a bad road, no drift-out occurs. Thus, excellent running stability can be ensured.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: September 1, 1998
    Assignee: Tokico, Ltd.
    Inventor: Masaaki Uchiyama
  • Patent number: 5797594
    Abstract: A hydraulic shock absorber has a case that includes an oil chamber, a cylinder and a reservoir chamber inside the case. A piston connected to a piston rod is fitted into the cylinder. A pump rod is fitted into a pump tube located inside the piston rod for forming a pump chamber. The pump chamber is communicated with an oil chamber through an oil passage and with a cylinder upper chamber through another oil passage. The motion of the pump rod caused by extension and retraction of the piston rod allows oil to flow from the oil chamber to the pump chamber and then to the cylinder upper chamber for extending the piston rod. When a vehicle height is increased to a normal height, cut-outs formed in the pump rod serve to communicate the pump chamber with the cylinder upper chamber for stopping the extension of the piston rod. When it becomes higher than the normal height, an orifice passage serves to relieve oil of the cylinder upper chamber to the oil chamber for lowering the vehicle height.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: August 25, 1998
    Assignee: Tokico, Ltd.
    Inventors: Chigaya Sekine, Hiromi Machida
  • Patent number: 5775888
    Abstract: A scroll fluid machine includes a fixed scroll member having an end plate which is formed such that a central portion of the end plate which corresponds approximately to 1.5 to 2 turns of a wrap portion from its spiral starting end (innermost end) is a thick-walled portion having a relatively large plate thickness, and an outer peripheral portion of the end plate which lies radially outside the thick-walled portion is a thin-walled portion. The thickness of the thick-walled portion is set to be about 1.4 to 1.6 times the thickness of the thin-walled portion. By reducing thermal resistance at the thick-walled portion of the end plate, heat from compression chambers are conducted to radiating fins, thereby suppressing the transfer of the heat to the thin-walled portion.
    Type: Grant
    Filed: August 15, 1996
    Date of Patent: July 7, 1998
    Assignee: Tokico Ltd.
    Inventors: Susumu Sakamoto, Yuji Komai, Katsushi Hidano, Yoshio Kobayashi
  • Patent number: 5753986
    Abstract: A bearing 12 is provided on the end portion of a housing 30. This bearing 12 supports a shaft 14. A magnetic circuit 15, 16 for driving the shaft 14 is provided between the shaft 14 and the housing 30 with a gap 29 passing through in an axial direction. An entry route R1 for leading gas from the outside of the housing 30 to the gap 29 in the magnetic circuit 15, 16 and an exhaust route R2 for exhausting the gas to the outside of the housing 30 are provided so as not to reach the bearing 12. As a result, the lifespan of the electric motor can be lengthened, the startup time can be shortened, the number of parts can be reduced, the number of steps required for processing and assembly can be reduced, and the power loss can be decreased.
    Type: Grant
    Filed: November 18, 1996
    Date of Patent: May 19, 1998
    Assignee: Tokico Ltd.
    Inventor: Yukio Ohtani
  • Patent number: 5743167
    Abstract: A tandem pneumatic booster having a shell body, the inside of which is divided into two, front and rear, chambers by a center shell. Each chamber includes a negative pressure chamber and a working pressure chamber. A valve body is slidably fitted in the shell body and the center shell with seal members therebetween. The valve body is provided with an air passage for communication between the front and rear working pressure chambers. A valve mechanism is actuated in association with an input shaft to introduce atmospheric air into the front and rear working pressure chambers through the air passage so as to apply thrust to front and rear power pistons. The diaphragm of the front power piston has a bead on an inner periphery thereof. The valve body has a groove on an outer periphery thereof. A portion of the air passage which leads to the front working pressure chamber has a main passage portion extending axially in the valve body, and a bypass extending radially outward from the main passage portion.
    Type: Grant
    Filed: September 19, 1996
    Date of Patent: April 28, 1998
    Assignee: Tokico Ltd.
    Inventors: Shuzo Watanabe, Mitsuhiro Endo, Hiromi Ando
  • Patent number: 5736649
    Abstract: In a Karman vortex flowmeter according to the present invention, first and second ultrasonic transmission/reception devices are offset from each other along a flowing direction of fluid, and a switching device alternately switches the ultrasonic transmission/reception devices so that the ultrasonic transmission/reception devices can alternately perform transmission and reception. There is also provided a propagation time difference detector for determining a time difference between an ultrasonic wave propagation time when one of the ultrasonic transmission/reception devices performs the transmission, and an ultrasonic wave propagation time when the other of the ultrasonic transmission/reception devices performs the transmission, and for determining a flow rate of the fluid on the basis of the time difference. When no Karman vortex is generated or when the number of generated Karman vortices is greatly reduced, the minute flow rate of the fluid is measured by the propagation time difference detector.
    Type: Grant
    Filed: August 22, 1996
    Date of Patent: April 7, 1998
    Assignee: Tokico Ltd.
    Inventors: Kazumasa Kawasaki, Yutaka Inada, Koichi Tashiro
  • Patent number: 5735368
    Abstract: A disc brake mounting member has a pair of mounts to be secured to a non-rotating part of a vehicle on one side of a disc rotatably provided in the vehicle. The mounting member also has a pair of arms positioned on the outer side of the mounts in a radial direction of the disc for supporting a caliper so that the caliper can slide in the direction of the axis of the disc. The mounts are integrally formed with abutting surfaces, installation holes, and projections. Projections function as stoppers to be engaged by the non-rotating part of the vehicle when the mounting member is inserted between the disc and the non-rotating part.
    Type: Grant
    Filed: October 18, 1996
    Date of Patent: April 7, 1998
    Assignee: Tokico Ltd.
    Inventors: Kinzo Kobayashi, Shinji Suzuki, Kouichi Masuko
  • Patent number: 5735627
    Abstract: An articulating mechanism for use in a single- or multiple-fluid-path painting robot is presented. The articulation design is particularly suitable as a wrist-joint and is free from the problems of dead space and single-fluid-path limitations found in conventional wrist-joint designs. The mechanism is based on coupling two cylindrical casings coaxially so that arm casing, wrist casing and the flange ends are coaxially joint about a shaft axis. The end sections of each components are sealed while leaving a fluid space of a given spacing between the outer and inner casings. The casings provide a fluid passage space extending in the direction of the casings and is provided with fluid delivery holes for the delivery of paint and other fluid medium. The designs include a blocking member so that cleaning of the robotic device, and quick maintenance or color changes can be carried out during production operation.
    Type: Grant
    Filed: August 16, 1996
    Date of Patent: April 7, 1998
    Assignee: Tokico Ltd.
    Inventors: Wataru Nagao, Shingi Takahashi
  • Patent number: 5732599
    Abstract: A robotic device having at least first and second arms joined with an elbow-joint is relatively maintenance-free and is particularly suitable for use in an atmosphere full of vapors from paints or organic solvents. These substances pose considerable operational problems in conventional robotic devices because of the accumulation of dust and solvents, which causes not only degradation in the performance of the robot but requires high maintenance cost. These problems are solved in the present robotic device by housing the driving motor for the second arm within the confines of the cross sectional area of the first arm, and the second arm is coupled through a connector to the output shaft of the driving motor, again within the same confined area. Such a compact design includes side caps providing protection of the feed-through cables and wires, which are routed out of the first shaft inner space to loop around the elbow-joint to enter into the second shaft inner space.
    Type: Grant
    Filed: August 14, 1996
    Date of Patent: March 31, 1998
    Assignee: Tokico Ltd.
    Inventor: Yoshiko Iriyama
  • Patent number: 5701246
    Abstract: The present invention provides a suspension control apparatus for a vehicle ensuring good comfort regardless of a waving road surface condition. A control signal adjusting portion sends a control signal for decreasing a damping coefficient for an extension side to a control signal emitting portion when an absolute value of downward acceleration of sprung mass exceeds a sprung mass acceleration reference value. When the vehicle reaches the top of an undulation and the absolute value of the downward acceleration of the sprung mass exceeds the sprung mass acceleration reference value, the control signal adjusting portion sends the control signal for decreasing a damping coefficient for the extension side to the control signal emitting portion so that a shock absorber of variable damping coefficient type can easily be displaced toward the extension side.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: December 23, 1997
    Assignee: Tokico Ltd.
    Inventor: Masaaki Uchiyama
  • Patent number: 5687817
    Abstract: Wear warning elements are respectively provided in back plates of a pair of friction pads at the front side thereof with respect to a rotational direction of a disc rotor. A pad spring is disposed between the friction pads and a carrier. The pad spring includes a pair of spring portions. The spring portions are resiliently pressed against the wear warning elements to bias the friction pads away from the disc rotor, respectively. During a braking state, the friction pads are pressed against the disc rotor against the biasing force of the spring portions. When disengaging the friction pads from the disc rotor, the friction pads are moved by the biasing force of the spring portions of the pad spring, thereby enabling the friction pads to be reliably moved away from the disc rotor and preventing drag between the friction pads and the disc rotor.
    Type: Grant
    Filed: January 26, 1996
    Date of Patent: November 18, 1997
    Assignees: Tokico Ltd., Nissan Motor Co., Ltd.
    Inventors: Kinzo Kobayashi, Naganori Koshimizu, Shinji Suzuki
  • Patent number: 5655633
    Abstract: A piston connected to a piston rod is slidably mounted in a cylinder, and a lower cylinder chamber is connected to a reservoir. An extension side passage for communicating an upper cylinder chamber with the lower cylinder chamber and a compression side passage for communicating the cylinder chamber with the reservoir are provided with disc valves, respectively, behind which extension side and compression side back pressure chambers are formed. The extension side back pressure chamber is communicated with the upper and lower cylinder chambers through a fixed orifice and ports. The compression side back pressure chamber is communicated with the lower cylinder chamber and the reservoir through a fixed orifice and ports. By rotating a shutter, flow areas of the ports are changed to adjust orifice features and pressures in the extension side and compression side back pressure chambers are changed to adjust valve features.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: August 12, 1997
    Assignee: Tokico Ltd.
    Inventors: Takao Nakadate, Akira Kashiwagi, Takashi Nezu, Chigaya Sekine
  • Patent number: 5649611
    Abstract: A damping force control type hydraulic shock absorber has a damping force control mechanism adapted to generate damping force by controlling the flow of a hydraulic fluid sealed in a cylinder. Flow is induced by the extension and retraction of an operating rod inserted in the cylinder. The damping force control mechanism is further adapted to control the damping force by movement of its valve body. The damping force control mechanism is disposed on the side of the cylinder such that the direction of movement of the valve body is offset with respect to the center axis of the operating rod and crosses the center axis.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: July 22, 1997
    Assignee: Tokico, Ltd.
    Inventor: Takao Nakadate
  • Patent number: RE35547
    Abstract: In the present invention, the conditions necessary for the change from the reducing-pressure mode to the holding pressure mode are changed based on the length of the period of instability from the beginning of wheel slippage to the stopping of this slippage, and the length of the period of continued severe locking in which the slip ratio of the wheel exceeds a certain fixed value. Therefore, even when there is a disturbance in the form of roughnesses in the road surface or the like, this is determined to be a temporary phenomenon and the switching of the setting from the reducing-pressure mode to the holding pressure mode can take place in a reliable manner, and the usual, stable braking power can be achieved in correspondence with the relationship between the road surface and the tires.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: July 1, 1997
    Assignee: Tokico Ltd.
    Inventors: Masaru Sakuma, Toshio Takayama