Patents by Inventor Tsukasa Suzuura
Tsukasa Suzuura 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: 8529169Abstract: According to the invention, a drilling tool includes: a motor; a transmission drive unit for transmitting a rotation force of the motor to rotate a drill bit; and a dust collector for collecting dust produced from a workpiece drilled by the drill bit, wherein the dust collector is provided with a pierced portion pierced by the drill bit, a dust collection port for sucking the produced dust and its surrounding air, and a blowoff port for blowing air against a vicinity of the piercing drill bit.Type: GrantFiled: December 5, 2008Date of Patent: September 10, 2013Assignee: Hitachi Koki Co., Ltd.Inventors: Tomomasa Nishikawa, Kenji Kobori, Tsukasa Suzuura
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Patent number: 8261854Abstract: A reciprocating tool (1) includes a housing (20, 30), a driving source (21), a reciprocation conversion unit (34, 36), —and a vibration reduction mechanism (30). The driving source is accommodated in the” housing. The reciprocation conversion unit (34, 36) is supported by the housing and is configured to convert a driving force of the driving source into a reciprocating motion for providing a tool bit (16) movably supported to the housing with a reciprocating motion. The vibration reduction mechanism (70) includes a shaft (72), a weight (71), a support member (73), and a urging portion (74). The shaft i(72)s supported by the housing and extending in a direction perpendicular to directions of the reciprocating motion of the tool bit (41) t and has an axis. The weight (71) is located away from the shaft (72) and is swingable in a swinging direction. The support member (73) swingably supports the weight (71) about the axis of the shaft (72).Type: GrantFiled: April 30, 2008Date of Patent: September 11, 2012Assignee: Hitachi Koki Co., LtdInventors: Atsuyuki Kikuchi, Tsukasa Suzuura, Hiroshi Haga, Kuniaki Kanbe, Tomoya Ikeda
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Patent number: 8191697Abstract: A spring clutch mechanism for transmitting a driving force of a driving part to a driven part, including a first part, a second part, and a spring disposed between the first part and the second part. The first part is connected to the driven part. The second part is connected to the driving part and is rotatable relative to the first part coaxially therewith. The first part has a first end provided with a frusto-conical portion having a first tapered surface, and the second part has a second end formed with a recess provided with a second tapered surface in contact with the first tapered surface. the first part and the second part are aligned linearly and coaxially in a state that the first end is inserted into the second end maintaining contact of the first tapered surface with the second tapered surface.Type: GrantFiled: May 27, 2009Date of Patent: June 5, 2012Assignee: Hitachi Koki Co., Ltd.Inventors: Shinichirou Satou, Hideki Yamada, Tsukasa Suzuura
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Patent number: 8146463Abstract: A screw driver capable of avoiding co-rotation of an end bit and a motor in case of sharp shooting the end bit with a groove in a head of a screw. A co-rotation preventing mechanism is engageable with an end bit mounting portion when the end bit mounting portion is at a frontward position to prevent the end bit mounting portion from being rotated in the forward direction and to allow the end bit mounting portion to rotate in the reverse direction. The preventing mechanism is disengageable from the end bit mounting portion when the end bit mounting portion is at the rearward position to allow the end bit mounting portion to rotate in both forward and reverse directions.Type: GrantFiled: May 27, 2009Date of Patent: April 3, 2012Assignee: Hitachi Koki Co., Ltd.Inventors: Shinichirou Satou, Hideki Yamada, Tsukasa Suzuura
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Patent number: 8016047Abstract: An electrical power tool includes a motor, a casing, a casing, a piston, an intermediate shaft, a motion conversion mechanism, and a plurality of types of anti-vibration mechanism. The motor has a drive shaft. The casing accommodates at least the motor. The piston is driven by a rotary motion of the drive shaft. The intermediate shaft extends parallel to the drive shaft and is driven to rotate by the rotary motion of the drive shaft, the intermediate shaft defining an axial direction. The motion conversion mechanism is disposed on the intermediate shaft and is capable of moving in association with the intermediate shaft for converting the rotary motion of the drive shaft to a reciprocating motion. The motion conversion mechanism includes a first motion conversion mechanism that is connected to the piston and moves the piston in a reciprocating motion in directions substantially parallel to the axial direction of the intermediate shaft.Type: GrantFiled: July 9, 2007Date of Patent: September 13, 2011Assignee: Hitachi Koki Co., Ltd.Inventors: Takahiro Ookubo, Tsukasa Suzuura
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Patent number: 7836971Abstract: An elastic unit includes a transatory unit including a first elastic support member, a second elastic support member and not-shown four round bar-shaped elastic bodies made of rubber. A rotation urging unit is composed of a Neidhart spring including an outer frame, a shaft, a rotary member, and four rubber rods. The rotary member is in a state where it is rotated at 10° counterclockwise from an initial state. Therefore, the rubber rod deforms upon reception of rolling friction from the outer frame and the rotary member, and the rotation urging unit gives the handle portion the urging power by which the handle portion is rotated so that one end of the handle portion is spaced away from a gear housing 31 in the direction of the handle portion.Type: GrantFiled: June 15, 2007Date of Patent: November 23, 2010Assignee: Hitachi Koki Co., Ltd.Inventors: Atsuyuki Kikuchi, Tsukasa Suzuura
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Patent number: 7819203Abstract: An impact force is transmitted to a tip end tool due to the changes of the air pressure within an air chamber generated by the reciprocal operation of the piston within a striker. The attachment portion of a tip end tool holding member for holding the tip end tool to a cylinder casing is sandwiched between buffers disposed in the two directions of the axial direction of the tool thereby to elastically support the tip end tool holding member to be movable in the two directions of the axial direction of the tool.Type: GrantFiled: June 7, 2005Date of Patent: October 26, 2010Assignee: Hitachi Koki Co., Ltd.Inventors: Shinichiro Sato, Tsukasa Suzuura, Takahiro Hirai
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Patent number: 7766096Abstract: An electrical power tool (1) includes a housing (10,20,30), an electrical motor (21), a motion conversion mechanism (36), a counterweight holding member (73), a counterweight (74), and support members (71,72). The electrical motor (21) is accommodated in the housing (10,20,30). The motion conversion mechanism (36) is configured to convert a rotary motion of the electrical motor (21) into a reciprocation motion. The counterweight holding member (73) extends in a direction perpendicular to directions of the reciprocation motion and is capable of being elastically deformed in the directions of the reciprocation motion. The counterweight (74) is supported by the counterweight holding member (73) and is capable of reciprocating in the directions of reciprocation motion together with the counterweight holding member (73). The support members (71,72) are positioned away from the counterweight (74) by a predetermined distance for supporting the counterweight holding member (73) to the housing (10,20,30).Type: GrantFiled: February 27, 2007Date of Patent: August 3, 2010Assignee: Hitachi Koki Co., Ltd.Inventors: Shinichirou Satou, Tsukasa Suzuura, Shinki Ohtsu
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Publication number: 20100163262Abstract: An electrical power tool (1) includes a motor (21), a casing (2), a piston (54), an intermediate shaft (41), a motion conversion mechanism (51A, 52, 52B; 51B, 53, 53B), and a plurality of types of anti-vibration mechanism (31,32,33; 55,40b). The motor (21) has a drive shaft (22). The casing (2) accommodates at least the motor (21). The piston (54) is driven by a rotary motion of the drive shaft (22). The intermediate shaft (41) extends parallel to the drive shaft (22) and is driven to rotate by the rotary motion of the drive shaft (22), the intermediate shaft (41) defining an axial direction. The motion conversion mechanism (51A, 52, 52B; 51B, 53, 53B) is disposed on the intermediate shaft (41) and is capable of moving in association with the intermediate shaft (41) for converting the rotary motion of the drive shaft (22) to a reciprocating motion.Type: ApplicationFiled: July 9, 2007Publication date: July 1, 2010Inventors: Takahiro Ookubo, Tsukasa Suzuura
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Publication number: 20100038105Abstract: A reciprocating tool (1) includes a housing (20, 30), a driving source (21), a reciprocation conversion unit (34, 36), —and a vibration reduction mechanism (30). The driving source is accommodated in the” housing. The reciprocation conversion unit (34, 36) is supported by the housing and is configured to convert a driving force of the driving source into a reciprocating motion for providing a tool bit (16) movably supported to the housing with a reciprocating motion. The vibration reduction mechanism (70) includes a shaft (72), a weight (71), a support member (73), and a urging portion (74). The shaft i(72)s supported by the housing and extending in a direction perpendicular to directions of the reciprocating motion of the tool bit (41) t and has an axis. The weight (71) is located away from the shaft (72) and is swingable in a swinging direction. The support member (73) swingably supports the weight (71) about the axis of the shaft (72).Type: ApplicationFiled: April 30, 2008Publication date: February 18, 2010Applicant: Hitachi Koki Co., LtdInventors: Atsuyuki Kikuchi, Tsukasa Suzuura, Hiroshi Haga, Kuniaki Kanbe, Tomoya Ikeda
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Publication number: 20090294145Abstract: A screw driver capable of avoiding co-rotation of an end bit and a motor in case of sharp shooting the end bit with a groove in a head of a screw. A co-rotation preventing mechanism is engageable with an end bit mounting portion when the end bit mounting portion is at a frontward position to prevent the end bit mounting portion from being rotated in the forward direction and to allow the end bit mounting portion to rotate in the reverse direction. The preventing mechanism is disengageable from the end bit mounting portion when the end bit mounting portion is at the rearward position to allow the end bit mounting portion to rotate in both forward and reverse directions.Type: ApplicationFiled: May 27, 2009Publication date: December 3, 2009Inventors: Shinichirou SATOU, Hideki YAMADA, Tsukasa SUZUURA
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Publication number: 20090293653Abstract: A spring clutch mechanism for transmitting a driving force of a driving part to a driven part, including a first part, a second part, and a spring disposed between the first part and the second part. The first part is connected to the driven part. The second part is connected to the driving part and is rotatable relative to the first part coaxially therewith. The first part has a first end provided with a frusto-conical portion having a first tapered surface, and the second part has a second end formed with a recess provided with a second tapered surface in contact with the first tapered surface. the first part and the second part are aligned linearly and coaxially in a state that the first end is inserted into the second end maintaining contact of the first tapered surface with the second tapered surface.Type: ApplicationFiled: May 27, 2009Publication date: December 3, 2009Inventors: Shinichirou Satou, Hideki Yamada, Tsukasa Suzuura
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Publication number: 20090148248Abstract: According to the invention, a drilling tool includes: a motor; a transmission drive unit for transmitting a rotation force of the motor to rotate a drill bit; and a dust collector for collecting dust produced from a workpiece drilled by the drill bit, wherein the dust collector is provided with a pierced portion pierced by the drill bit, a dust collection port for sucking the produced dust and its surrounding air, and a blowoff port for blowing air against a vicinity of the piercing drill bit.Type: ApplicationFiled: December 5, 2008Publication date: June 11, 2009Inventors: Tomomasa Nishikawa, Kenji Kobori, Tsukasa Suzuura
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Publication number: 20090095499Abstract: An electrical power tool (1) includes a housing (10,20,30), an electrical motor (21), a motion conversion mechanism (36), a counterweight holding member (73), a counterweight (74), and support members (71,72). The electrical motor (21) is accommodated in the housing (10,20,30). The motion conversion mechanism (36) is configured to convert a rotary motion of the electrical motor (21) into a reciprocation motion. The counterweight holding member (73) extends in a direction perpendicular to directions of the reciprocation motion and is capable of being elastically deformed in the directions of the reciprocation motion. The counterweight (74) is supported by the counterweight holding member (73) and is capable of reciprocating in the directions of reciprocation motion together with the counterweight holding member (73). The support members (71,72) are positioned away from the counterweight (74) by a predetermined distance for supporting the counterweight holding member (73) to the housing (10,20,30).Type: ApplicationFiled: February 27, 2007Publication date: April 16, 2009Inventors: Shinichirou Satou, Tsukasa Suzuura, Shinki Ohtsu
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Publication number: 20070289762Abstract: An elastic unit includes a transatory unit including a first elastic support member, a second elastic support member and not-shown four round bar-shaped elastic bodies made of rubber. A rotation urging unit is composed of a Neidhart spring including an outer frame, a shaft, a rotary member, and four rubber rods. The rotary member is in a state where it is rotated at 10° counterclockwise from an initial state. Therefore, the rubber rod deforms upon reception of rolling friction from the outer frame and the rotary member, and the rotation urging unit gives the handle portion the urging power by which the handle portion is rotated so that one end of the handle portion is spaced away from a gear housing 31 in the direction of the handle portion.Type: ApplicationFiled: June 15, 2007Publication date: December 20, 2007Inventors: Atsuyuki KIKUKCHI, Tsukasa Suzuura
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Publication number: 20050269117Abstract: An impact force is transmitted to a tip end tool due to the changes of the air pressure within an air chamber generated by the reciprocal operation of the piston within a striker. The attachment portion of a tip end tool holding member for holding the tip end tool to a cylinder casing is sandwiched between buffers disposed in the two directions of the axial direction of the tool thereby to elastically support the tip end tool holding member to be movable in the two directions of the axial direction of the tool.Type: ApplicationFiled: June 7, 2005Publication date: December 8, 2005Applicant: Hitachi Koki Co., Ltd.Inventors: Shinichiro Sato, Tsukasa Suzuura, Takahiro Hirai
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Patent number: 6089835Abstract: A motor and a power transmitting mechanism are accommodated and supported in a two-piece housing unit separable into first and second housings. An air tank is defined by an outer surface of the second housing and an inside surface of a third housing provided on a recessed outer surface of the second housing.Type: GrantFiled: December 18, 1998Date of Patent: July 18, 2000Assignee: Hitachi Koki Co., Ltd.Inventors: Tsukasa Suzuura, Mitsuo Ogura, Mitsuyuki Ishikawa, Toshifumi Kubota, Mitsuhiro Sunaoshi