Patents by Inventor Takuya Obata

Takuya Obata has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6862882
    Abstract: There is provided a pneumatic booster having an ejector, which achieves space-saving and enables easy piping. An ejector 4 is provided within a constant-pressure chamber 3 formed in an outer shell 2. A connecting pipe 19 communicated with an outlet of a diffuser and a connecting pipe communicated with an inlet of a nozzle extend outward of the shell, and a suction port is open to the inside of the constant-pressure chamber 3 through a check valve. The connecting pipe 19 is communicated with the constant-pressure chamber 3 through a check valve 10, and is connected to a suction pipe of an engine (a source of a negative pressure). The connecting pipe on the inlet side of the nozzle is connected to an air cleaner (the atmosphere). A negative pressure is directly supplied from the connecting pipe 19 to the constant-pressure chamber 3 through the check valve 10. The ejector 4 is operated to supply a high degree of vacuum to the constant-pressure chamber 3 through the suction port.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: March 8, 2005
    Assignee: Tokico Ltd.
    Inventors: Toshio Takayama, Takuya Obata
  • Publication number: 20040060431
    Abstract: There is provided a pneumatic booster having an ejector, which achieves space-saving and enables easy piping.
    Type: Application
    Filed: August 15, 2003
    Publication date: April 1, 2004
    Inventors: Toshio Takayama, Takuya Obata
  • Patent number: 6425312
    Abstract: The present invention provides a brake booster that, although simple in construction, capable of adjusting the braking force derived by operation of a solenoid mechanism without worsening the braking response. In the brake booster according to the present invention, when a movable member (34) is shifted toward the rear side by electromagnetic force of a solenoid (31), the shifting movement is transmitted to a valve seat member (21) through pins (50) to open an atmospheric valve (27) through which air is introduced into a variable pressure chamber (9,10), whereby a pressure difference is created between the variable pressure chamber and a constant pressure chamber and generates booster output (thrust output force).
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: July 30, 2002
    Assignee: Tokico, Ltd.
    Inventors: Toshio Takayama, Kunihiro Matsunaga, Takuya Obata
  • Patent number: 6386087
    Abstract: The present invention provides a control booster which is capable of appropriately detecting a pedal-operated brake operation during an automatic brake operation. For moving a stop key from a position on a side of a rear-side abutment surface (where a reaction force of a switch acting on a switch operating rod and a spring force of a switch spring are balanced) toward an intermediate position, when the stop key is located on a side of the rear-side abutment surface, only a return force of the spring acts on a contact operating element of the switch. On the other hand, when the stop key moves toward the intermediate position, an abutment portion is separated from the contact operating element (that is, the switch operating rod moves in a direction for separation relative to the switch), so that no load is applied to the contact operating element.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: May 14, 2002
    Assignee: Tokico Ltd.
    Inventors: Toshio Takayama, Kunihiro Matsunaga, Takuya Obata
  • Patent number: 6321633
    Abstract: The present invention provides a booster in which magnitude of output can be adjusted also by an operation of a solenoid mechanism. An armature (13) is shifted to the right (in FIG. 1) in opposition to a returning spring by applying electricity to a solenoid (39), with the result that a space (80) on one end of the armature is communicated with a constant pressure chamber (5) through a passage (T3). When an electromagnetic force acting on the armature (13) exceeds a predetermined value, a distal end of a valve member (28) is shifted to the right (in FIG. 1) via a cylindrical member (31) to open an atmospheric valve (34), thereby introducing the atmosphere into a variable pressure chamber (6). The pressure in the variable pressure chamber is applied to the other end of the armature and the difference in the pressure tends to move the armature toward its home position.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: November 27, 2001
    Assignee: Tokico Ltd.
    Inventors: Toshio Takayama, Kunihiro Matsunaga, Takuya Obata
  • Publication number: 20010029834
    Abstract: The present invention provides a control booster which is capable of appropriately detecting a pedal-operated brake operation during an automatic brake operation. For moving a stop key from a position on a side of a rear-side abutment surface (where a reaction force of a switch acting on a switch operating rod and a spring force of a switch spring are balanced) toward an intermediate position, when the stop key is located on a side of the rear-side abutment surface, only a return force of the spring acts on a contact operating element of the switch. On the other hand, when the stop key moves toward the intermediate position, an abutment portion is separated from the contact operating element (that is, the switch operating rod moves in a direction for separation relative to the switch), so that no load is applied to the contact operating element.
    Type: Application
    Filed: February 9, 2001
    Publication date: October 18, 2001
    Inventors: Toshio Takayama, Kunihiro Matsunaga, Takuya Obata
  • Publication number: 20010025565
    Abstract: The present invention provides a brake booster that, although simple in construction, capable of adjusting the braking force derived by operation of a solenoid mechanism without worsening the braking response. In the brake booster according to the present invention, when a movable member (34) is shifted toward the rear side by electromagnetic force of a solenoid (31), the shifting movement is transmitted to a valve seat member (21) through pins (50) to open an atmospheric valve (27) through which air is introduced into a variable pressure chamber (9,10), whereby a pressure difference is created between the variable pressure chamber and a constant pressure chamber and generates booster output (thrust output force).
    Type: Application
    Filed: March 21, 2001
    Publication date: October 4, 2001
    Applicant: Tokico, Ltd.
    Inventors: Toshio Takayama, Kunihiro Matsunaga, Takuya Obata