Patents by Inventor Haruhiko Oouchi
Haruhiko Oouchi 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).
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Patent number: 11185967Abstract: A driving tool capable of avoiding blank shot after a predetermined time has elapsed when performing a bump firing and capable of smoothly performing the bump firing is provided. The driving tool includes: an accumulator chamber which accumulates compressed air; a nose section provided on a housing; a cylinder; a trigger; and a push lever provided in the nose section, and when the trigger and the push lever are operated, the compressed air is supplied into the cylinder. The driving tool further includes: a delay valve which prevents the compressed air from being supplied into the cylinder when the push lever is not operated within a predetermined time after the trigger is operated: and a switching valve which supplies the compressed air of the accumulator chamber to the delay valve when the trigger is operated, and discharges the compressed air supplied to the delay valve to an outside of the housing when the push lever is operated within the predetermined time.Type: GrantFiled: November 25, 2016Date of Patent: November 30, 2021Assignee: KOKI HOLDINGS CO., LTD.Inventor: Haruhiko Oouchi
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Publication number: 20190022842Abstract: A driving tool capable of avoiding blank shot after a predetermined time has elapsed when performing a bump firing and capable of smoothly performing the bump firing is provided. The driving tool includes: an accumulator chamber which accumulates compressed air, a nose section provided on a housing; a cylinder; a trigger, and a push lever provided in the nose section, and when the trigger and the push lever are operated, the compressed air is supplied into the cylinder. The driving tool further includes: a delay valve which prevents the compressed air from being supplied into the cylinder when the push lever is not operated within a predetermined time after the trigger is operated: and a switching valve which supplies the compressed air of the accumulator chamber to the delay valve when the trigger is operated, and discharges the compressed air supplied to the delay valve to an outside of the housing when the push lever is operated within the predetermined time.Type: ApplicationFiled: November 25, 2016Publication date: January 24, 2019Inventor: Haruhiko OOUCHI
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Patent number: 9669529Abstract: In a driving tool, a push lever plunger is moved upward by a push lever unit when the push lever unit is disposed at an uppermost position. The push lever unit includes a first protruding part and a second protruding part. The first protruding part is configured to contact a first contact part of a housing when the push lever unit is disposed at the uppermost position. The second protruding part is configured to contact a second contact part of the housing when the push lever unit is disposed at the uppermost position. A compressed air control unit, the second protruding part, and an ejection channel are disposed within an imaginary plane extending in an approximate vertical direction. The compressed air control unit is disposed on a side opposite to the second protruding part with respect to the ejection channel in a horizontal direction.Type: GrantFiled: August 13, 2014Date of Patent: June 6, 2017Assignee: Hitachi Koki Co., Ltd.Inventors: Yoshinori Ishizawa, Haruhiko Oouchi
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Patent number: 9061408Abstract: A rigid member is configured to move a valve member to separate the valve member from an engaging part when a push lever moves from a lower dead center to an upper dead center. A resilient member is configured to move the valve member to separate the valve member from the engaging part when the push lever moves from the lower dead center to the upper dead center. A switching part selects one of the rigid member and the resilient member to move the valve member to separate the valve member from the engaging part. When the switching part selects the rigid member, a fastener driving operation is performed regardless of an order of a pulling operation and a pressing operation. When the switching part selects the resilient member, the fastener driving operation is performed only when the pulling operation is executed after the pressing operation is executed.Type: GrantFiled: November 22, 2011Date of Patent: June 23, 2015Assignee: HITACHI KOKI CO., LTD.Inventors: Yoshinori Ishizawa, Haruhiko Oouchi, Yoshimitsu Iijima
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Publication number: 20150090758Abstract: In a driving tool, a push lever plunger is moved upward by a push lever unit when the push lever unit is disposed at an uppermost position. The push lever unit includes a first protruding part and a second protruding part. The first protruding part is configured to contact a first contact part of a housing when the push lever unit is disposed at the uppermost position. The second protruding part is configured to contact a second contact part of the housing when the push lever unit is disposed at the uppermost position. A compressed air control unit, the second protruding part, and an ejection channel are disposed within an imaginary plane extending in an approximate vertical direction. The compressed air control unit is disposed on a side opposite to the second protruding part with respect to the ejection channel in a horizontal direction.Type: ApplicationFiled: August 13, 2014Publication date: April 2, 2015Inventors: Yoshinori Ishizawa, Haruhiko Oouchi
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Patent number: 8708209Abstract: A driving tool includes a housing, a magazine, a cylinder head, a push lever, a cylinder, a combustion chamber frame, a piston, an injection part, and a fastener feeding unit. The housing has one end portion and another end portion. The magazine is connected to the housing and accommodating a fastener. The cylinder head is disposed at the one end portion. The push lever is movable relative to the housing upon pressure contacting a workpiece in a moving direction. The cylinder is fixed to the housing. The combustion chamber frame is movable in the housing in accordance with the push lever and selectively defining a combustion chamber in cooperation with the cylinder. The piston is slidably reciprocally movable relative to the cylinder and displaced upon expansion of air/fuel mixture in the combustion chamber. The injection part is connected to the another end portion of the housing and having an injection passage in communication with the magazine.Type: GrantFiled: February 22, 2011Date of Patent: April 29, 2014Assignee: Hitachi Koki Co., Ltd.Inventor: Haruhiko Oouchi
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Publication number: 20120298712Abstract: A rigid member is configured to move a valve member to separate the valve member from an engaging part when a push lever moves from a lower dead center to an upper dead center. A resilient member is configured to move the valve member to separate the valve member from the engaging part when the push lever moves from the lower dead center to the upper dead center. A switching part selects one of the rigid member and the resilient member to move the valve member to separate the valve member from the engaging part. When the switching part selects the rigid member, a fastener driving operation is performed regardless of an order of a pulling operation and a pressing operation. When the switching part selects the resilient member, the fastener driving operation is performed only when the pulling operation is executed after the pressing operation is executed.Type: ApplicationFiled: November 22, 2011Publication date: November 29, 2012Applicant: Hitachi Koki Co., Ltd.Inventors: Yoshinori Ishizawa, Haruhiko Oouchi, Yoshimitsu Iijima
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Publication number: 20110240709Abstract: A driving tool includes a housing, a magazine, a cylinder head, a push lever, a cylinder, a combustion chamber frame, a piston, an injection part, and a fastener feeding unit. The housing has one end portion and another end portion. The magazine is connected to the housing and accommodating a fastener. The cylinder head is disposed at the one end portion. The push lever is movable relative to the housing upon pressure contacting a workpiece in a moving direction. The cylinder is fixed to the housing. The combustion chamber frame is movable in the housing in accordance with the push lever and selectively defining a combustion chamber in cooperation with the cylinder. The piston is slidably reciprocally movable relative to the cylinder and displaced upon expansion of air/fuel mixture in the combustion chamber. The injection part is connected to the another end portion of the housing and having an injection passage in communication with the magazine.Type: ApplicationFiled: February 22, 2011Publication date: October 6, 2011Applicant: Hitachi Koki Co., Ltd.Inventor: Haruhiko Oouchi
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Patent number: 7370559Abstract: A pneumatically operated screw driver ensuring a complete return of a piston to its top dead center. The screw driver has a compressed air return chamber for returning the piston to its top dead center by applying a compressed air in the return chamber to the piston. The piston includes a main piston and an auxiliary piston. The main piston is first reaches its bottom dead center, and then the auxiliary piston reaches its bottom dead center whereupon screw driving is terminated. Before the auxiliary piston reaches its bottom dead center, and after the main piston moves past a predetermined position, a compressed air is introduced into the return chamber. After the main piston reaches the bottom dead center, application of the compressed air pressure in the return chamber to the auxiliary piston is prevented.Type: GrantFiled: September 3, 2004Date of Patent: May 13, 2008Assignee: Hitachi Koki Co., Ltd.Inventors: Takeshi Kamo, Akira Uno, Michio Wakabayashi, Haruhiko Oouchi, Yasuo Sasaki
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Patent number: 7255257Abstract: A pneumatically operated power tool such as a screw driver, a nail gun and an impact wrench those being driven by a pneumatic pressure. A pressure reduction valve is provided between a connector connected to a compressor and a compressed air chamber defined in an outer frame of the power tool for supplying a pressure lower than the pressure at the connector to the compressed air chamber. A passage section is provided independently of the pressure reduction valve and communicating the connector with the compressed air chamber. A valve member is disposed at the passage section for selectively applying compressed air from the connector to the compressed air chamber directly through the passage section.Type: GrantFiled: April 18, 2006Date of Patent: August 14, 2007Assignee: Hitachi Koki Co., Ltd.Inventors: Haruhiko Oouchi, Shoichi Hirai, Michio Wakabayashi
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Patent number: 7165478Abstract: A pneumatically operated screw driver ensuring a complete return of a piston to its top dead center. The screw driver has a compressed air return chamber for returning the piston to its top dead center by applying a compressed air in the return chamber to the piston. The piston includes a main piston and an auxiliary piston. The auxiliary piston includes a piston section and a flange section those being disposed in the main piston. The piston section is slidably movable relative to the main piston, and the flange section is axially spaced away from the piston section and radially spaced away from the main piston. After the main piston reaches its bottom dead center, the auxiliary piston further moves toward its bottom dead center. An air space chamber is provided between the piston section and the flange section and within the main piston.Type: GrantFiled: October 1, 2004Date of Patent: January 23, 2007Assignee: Hitachi Koki Co., Ltd.Inventors: Takeshi Kamo, Yasuo Sasaki, Michio Wakabayashi, Haruhiko Oouchi
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Patent number: 7093743Abstract: A pneumatically operated power tool such as a screw driver, a nail gun and an impact wrench those being driven by a pneumatic pressure. A pressure reduction valve is provided between a connector connected to a compressor and a compressed air chamber defined in an outer frame of the power tool for supplying a pressure lower than the pressure at the connector to the compressed air chamber. A passage section is provided independently of the pressure reduction valve and communicating the connector with the compressed air chamber. A valve member is disposed at the passage section for selectively applying compressed air from the connector to the compressed air chamber directly through the passage section.Type: GrantFiled: October 14, 2004Date of Patent: August 22, 2006Assignee: Hitachi Koki Co., Ltd.Inventors: Haruhiko Oouchi, Shoichi Hirai, Michio Wakabayashi
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Publication number: 20060180632Abstract: A pneumatically operated power tool such as a screw driver, a nail gun and an impact wrench those being driven by a pneumatic pressure. A pressure reduction valve is provided between a connector connected to a compressor and a compressed air chamber defined in an outer frame of the power tool for supplying a pressure lower than the pressure at the connector to the compressed air chamber. A passage section is provided independently of the pressure reduction valve and communicating the connector with the compressed air chamber. A valve member is disposed at the passage section for selectively applying compressed air from the connector to the compressed air chamber directly through the passage section.Type: ApplicationFiled: April 18, 2006Publication date: August 17, 2006Inventors: Haruhiko Oouchi, Shoichi Hirai, Michio Wakabayashi
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Patent number: 7013985Abstract: A compact and light-weight pneumatically operated screw driver providing high speed screw fastening with high operability. A rotary member rotationally driven by a pneumatic motor includes a main rotary member made from a plastic material and a sliding segment fixed to the main rotary member. A rotation slide member is axially slidably movable relative to the rotary member and is rotatable together with the rotation of the rotary member. A shut-off section is provided on which the rotation slide member is rotationally seated when the rotation slide member is moved toward the shut-off section. The rotation slide member is made from an elastic material. A sleeve like piston having a seal ring in sliding contact with a cylinder is provided. The seal ring shuts off a supply of compressed air to the pneumatic motor only by the seating of the rotation slide member onto the shut-off section.Type: GrantFiled: October 1, 2004Date of Patent: March 21, 2006Assignee: Hitachi Koki Co., Ltd.Inventors: Yasuo Sasaki, Takeshi Kamo, Michio Wakabayashi, Haruhiko Oouchi
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Publication number: 20050077064Abstract: A pneumatically operated power tool such as a screw driver, a nail gun and an impact wrench those being driven by a pneumatic pressure. A pressure reduction valve is provided between a connector connected to a compressor and a compressed air chamber defined in an outer frame of the power tool for supplying a pressure lower than the pressure at the connector to the compressed air chamber. A passage section is provided independently of the pressure reduction valve and communicating the connector with the compressed air chamber. A valve member is disposed at the passage section for selectively applying compressed air from the connector to the compressed air chamber directly through the passage section.Type: ApplicationFiled: October 14, 2004Publication date: April 14, 2005Inventors: Haruhiko Oouchi, Shoichi Hirai, Michio Wakabayashi
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Publication number: 20050072275Abstract: A compact and light-weight pneumatically operated screw driver providing high speed screw fastening with high operability. A rotary member rotationally driven by a pneumatic motor includes a main rotary member made from a plastic material and a sliding segment fixed to the main rotary member. A rotation slide member is axially slidably movable relative to the rotary member and is rotatable together with the rotation of the rotary member. A shut-off section is provided on which the rotation slide member is rotationally seated when the rotation slide member is moved toward the shut-off section. The rotation slide member is made from an elastic material. A sleeve like piston having a seal ring in sliding contact with a cylinder is provided. The seal ring shuts off a supply of compressed air to the pneumatic motor only by the seating of the rotation slide member onto the shut-off section.Type: ApplicationFiled: October 1, 2004Publication date: April 7, 2005Inventors: Yasuo Sasaki, Takeshi Kamo, Michio Wakabayashi, Haruhiko Oouchi
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Publication number: 20050072585Abstract: A pneumatically operated screw driver ensuring a complete return of a piston to its top dead center. The screw driver has a compressed air return chamber for returning the piston to its top dead center by applying a compressed air in the return chamber to the piston. The piston includes a main piston and an auxiliary piston. The auxiliary piston includes a piston section and a flange section those being disposed in the main piston. The piston section is slidably movable relative to the main piston, and the flange section is axially spaced away from the piston section and radially spaced away from the main piston. After the main piston reaches its bottom dead center, the auxiliary piston further moves toward its bottom dead center. An air space chamber is provided between the piston section and the flange section and within the main piston.Type: ApplicationFiled: October 1, 2004Publication date: April 7, 2005Inventors: Takeshi Kamo, Yasuo Sasaki, Michio Wakabayashi, Haruhiko Oouchi
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Publication number: 20050061847Abstract: A pneumatically operated screw driver ensuring a complete return of a piston to its top dead center. The screw driver has a compressed air return chamber for returning the piston to its top dead center by applying a compressed air in the return chamber to the piston. The piston includes a main piston and an auxiliary piston. The main piston is first reaches its bottom dead center, and then the auxiliary piston reaches its bottom dead center whereupon screw driving is terminated. Before the auxiliary piston reaches its bottom dead center, and after the main piston moves past a predetermined position, a compressed air is introduced into the return chamber. After the main piston reaches the bottom dead center, application of the compressed air pressure in the return chamber to the auxiliary piston is prevented.Type: ApplicationFiled: September 3, 2004Publication date: March 24, 2005Applicant: HITACHI KOKI CO., LTD.Inventors: Takeshi Kamo, Akira Uno, Michio Wakabayashi, Haruhiko Oouchi, Yasuo Sasaki
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Patent number: D526551Type: GrantFiled: January 27, 2006Date of Patent: August 15, 2006Assignee: Hitachi Koki Co., Ltd.Inventors: Masato Sakai, Haruhiko Oouchi