Patents by Inventor Hiroshi Masunaga
Hiroshi Masunaga 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: 11929689Abstract: A power conversion device includes: a dead time application unit which applies a dead time to only one of a pair of pulse signals; a current polarity detection unit which detects a polarity of an output current; and a gate signal selection unit which, if the polarity of the output current is positive, selects the one pulse signal, to which the dead time has been applied, as a gate signal for a positive arm and selects the other pulse signal as a gate signal for a negative arm, and, if the polarity of the output current is negative, selects the one pulse signal, to which the dead time has been applied, as the gate signal for the negative arm and selects the other pulse signal as the gate signal for the positive arm.Type: GrantFiled: September 13, 2019Date of Patent: March 12, 2024Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Ryoji Tsuruta, Hiroshi Masunaga, Tomohiro Tanaka
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Patent number: 11439239Abstract: A backrest includes: a backrest body against which a seated person leans a back thereof, a backrest support positioned behind and supporting the backrest body; and an armrest body provided outside in a width direction of the backrest body and supported by the backrest support so as to move up and down at a position separated from the backrest body. A chair includes the above-described backrest.Type: GrantFiled: October 17, 2019Date of Patent: September 13, 2022Assignee: OKAMURA CORPORATIONInventors: Hiroshi Masunaga, Syunsuke Ishimaru
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Publication number: 20220286062Abstract: A power conversion device includes: a dead time application unit which applies a dead time to only one of a pair of pulse signals; a current polarity detection unit which detects a polarity of an output current; and a gate signal selection unit which, if the polarity of the output current is positive, selects the one pulse signal, to which the dead time has been applied, as a gate signal for a positive arm and selects the other pulse signal as a gate signal for a negative arm, and, if the polarity of the output current is negative, selects the one pulse signal, to which the dead time has been applied, as the gate signal for the negative arm and selects the other pulse signal as the gate signal for the positive arm.Type: ApplicationFiled: September 13, 2019Publication date: September 8, 2022Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Ryoji TSURUTA, Hiroshi MASUNAGA, Tomohiro TANAKA
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Publication number: 20210337971Abstract: A backrest includes: a backrest body against which a seated person leans a back thereof, a backrest support positioned behind and supporting the backrest body; and an armrest body provided outside in a width direction of the backrest body and supported by the backrest support so as to move up and down at a position separated from the backrest body. A chair includes the above-described backrest.Type: ApplicationFiled: October 17, 2019Publication date: November 4, 2021Inventors: Hiroshi MASUNAGA, Syunsuke ISHIMARU
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Patent number: 11019928Abstract: An armrest according to the present invention includes a support member (8a, 215, 308a) which is a support structure, and an armrest main body (8b, 216, 308b), the armrest main body (8b, 216, 308b) includes a lower layer member (8j) including an operation lever (8p, 235, 308p) which is supported by a support member (8a, 215, 308a) to be movable in a forward-and-rearward direction and is operated by a seated person, and an upper layer member (8k) supported by the lower layer member (8j) to be movable in right-and-left direction, and the upper layer member (8k) covers the operation lever (8p, 235, 308p) at a base position in the right-and-left direction.Type: GrantFiled: June 9, 2017Date of Patent: June 1, 2021Assignee: OKAMURA CORPORATIONInventors: Yuuichirou Takagi, Hiroshi Masunaga, Ryo Igarashi, Syouichi Izawa
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Patent number: 11019930Abstract: A load support structure for a chair includes a tensile material on which a load support surface configured to receive a load of a seated person is formed, a pair of support sections (51) to which the tensile material is attached, and which is elastically deformable in response to a force acting from the tensile material, a first reinforcing section (41) which is disposed to be spaced apart from the pair of support sections (51) in a surface perpendicular direction perpendicular to the load support surface, is located on a side opposite to the load support surface, and extends along an extending direction of the support section, and a connecting body which connects each of both end portion sides of the support section (51) with a corresponding end portion side of both end portion sides of the first reinforcing section (41), in which the support sections (51) are disposed outside the first reinforcing section (41) in a view of the surface perpendicular direction from the load support surface side.Type: GrantFiled: June 8, 2017Date of Patent: June 1, 2021Assignee: OKAMURA CORPORATIONInventors: Hiroshi Masunaga, Syouichi Izawa
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Patent number: 10966530Abstract: A backrest (7) includes: a tensile material (71) on which a load support surface (71f) configured to receive a load of a seated person is formed; a back front frame (80F) that supports an outer peripheral end portion (71e) of the tensile material (71); an attachment portion (87) which is formed in the back front frame (80F) and faces the tensile material (71) in a state where the attachment portion (87) is separated from the tensile material (71) in a direction intersecting the load support surface (71f); and a lumber support (200) that is attachable to and detachable from the attachment portion (87), in which the lumber support (200) includes an attaching portion (222) which extends in a direction along the load support surface (71f), is inserted into a gap (S) between the tensile material (71) and the attachment portion (87), and is fixed to the attachment portion (87).Type: GrantFiled: June 9, 2017Date of Patent: April 6, 2021Assignee: OKAMURA CORPORATIONInventors: Hiroshi Masunaga, Shinpei Totsuka
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Patent number: 10932575Abstract: An armrest (8, 208) and a chair (100, 200) according to the present invention are provided with: an armrest body (8b, 208b) which is a movable member including a placing surface for supporting a limb of a seated person, and which is supported by a support rod (8a, 208a) from below so as to be movable in a horizontal direction; and a through-space (S, 200S) which is a guide portion indicating the position to be touched by the seated person when moving the armrest body (8b, 208b).Type: GrantFiled: June 8, 2017Date of Patent: March 2, 2021Assignee: OKAMURA CORPORATIONInventors: Hiroshi Masunaga, Ryo Igarashi, Syouichi Izawa
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Patent number: 10932573Abstract: A backrest (7) includes: a tensile material (71) on which a load support surface (71f) configured to receive a load of a seated person is formed; a back front frame (80F) that supports an outer peripheral end portion (71e) of the tensile material (71); an attachment portion (87) which is formed in the back front frame (80F) and faces the tensile material (71) in a state where the attachment portion (87) is separated from the tensile material (71) in a direction intersecting the load support surface (71f); and a lumber support (200) that is attachable to and detachable from the attachment portion (87), in which the lumber support (200) includes an attaching portion (222) which extends in a direction along the load support surface (71f), is inserted into a gap (S) between the tensile material (71) and the attachment portion (87), and is fixed to the attachment portion (87).Type: GrantFiled: June 9, 2017Date of Patent: March 2, 2021Assignee: OKAMURA CORPORATIONInventors: Hiroshi Masunaga, Shinpei Totsuka
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Patent number: 10898001Abstract: An armrest (8, 208) and a chair (100, 200) according to the present invention are provided with: an armrest body (8b, 208b) which is a movable member including a placing surface for supporting a limb of a seated person, and which is supported by a support rod (8a, 208a) from below so as to be movable in a horizontal direction; and a through-space (S, 200S) which is a guide portion indicating the position to be touched by the seated person when moving the armrest body (8b, 208b).Type: GrantFiled: June 8, 2017Date of Patent: January 26, 2021Assignee: OKAMURA CORPORATIONInventors: Hiroshi Masunaga, Ryo Igarashi, Syouichi Izawa
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Patent number: 10756567Abstract: When an abnormality occurs in a first voltage detector (4a), a control circuit (7) in an uninterruptible power supply device controls an inverter (3) in synchronization with an output signal (VI2D) from a second voltage detector (4b) to match a phase of a two-phase AC voltage (VO1, VO2) output from the inverter (3) with a phase of a two-phase AC voltage (VI1, VI2) supplied from a commercial AC power supply (51), and then turns on a semiconductor switch pair (S9, S10) and a bypass switch pair (S7, S8). Accordingly, even when an abnormality occurs in the first voltage detector (4a), the two-phase AC voltage can be supplied to a load (53) without instantaneous interruption.Type: GrantFiled: November 27, 2015Date of Patent: August 25, 2020Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Hiroshi Masunaga, Akihiro Yamanishi
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Publication number: 20190307250Abstract: A load support structure for a chair includes a tensile material on which a load support surface configured to receive a load of a seated person is formed, a pair of support sections (51) to which the tensile material is attached, and which is elastically deformable in response to a force acting from the tensile material, a first reinforcing section (41) which is disposed to be spaced apart from the pair of support sections (51) in a surface perpendicular direction perpendicular to the load support surface, is located on a side opposite to the load support surface, and extends along an extending direction of the support section, and a connecting body which connects each of both end portion sides of the support section (51) with a corresponding end portion side of both end portion sides of the first reinforcing section (41), in which the support sections (51) are disposed outside the first reinforcing section (41) in a view of the surface perpendicular direction from the load support surface side.Type: ApplicationFiled: June 8, 2017Publication date: October 10, 2019Inventors: Hiroshi MASUNAGA, Syouichi IZAWA
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Publication number: 20190307251Abstract: An armrest according to the present invention includes a support member (8a, 215, 308a) which is a support structure, and an armrest main body (8b, 216, 308b), the armrest main body (8b, 216, 308b) includes a lower layer member (8j) including an operation lever (8p, 235, 308p) which is supported by a support member (8a, 215, 308a) to be movable in a forward-and-rearward direction and is operated by a seated person, and an upper layer member (8k) supported by the lower layer member (8j) to be movable in right-and-left direction, and the upper layer member (8k) covers the operation lever (8p, 235, 308p) at a base position in the right-and-left direction.Type: ApplicationFiled: June 6, 2017Publication date: October 10, 2019Inventors: Yuuichirou TAKAGI, Hiroshi MASUNAGA, Ryo IGARASHI, Syouichi IZAWA
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Publication number: 20190298071Abstract: An armrest (8, 208) and a chair (100, 200) according to the present invention are provided with: an armrest body (8b, 208b) which is a movable member including a placing surface for supporting a limb of a seated person, and which is supported by a support rod (8a, 208a) from below so as to be movable in a horizontal direction; and a through-space (S, 200S) which is a guide portion indicating the position to be touched by the seated person when moving the armrest body (8b, 208b).Type: ApplicationFiled: June 8, 2017Publication date: October 3, 2019Applicant: OKAMURA CORPORATIONInventors: Hiroshi MASUNAGA, Ryo IGARASHI, Syouichi IZAWA
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Publication number: 20190298069Abstract: A backrest (7) includes: a tensile material (71) on which a load support surface (71f) configured to receive a load of a seated person is formed; a back front frame (80F) that supports an outer peripheral end portion (71e) of the tensile material (71); an attachment portion (87) which is formed in the back front frame (80F) and faces the tensile material (71) in a state where the attachment portion (87) is separated from the tensile material (71) in a direction intersecting the load support surface (71f); and a lumber support (200) that is attachable to and detachable from the attachment portion (87), in which the lumber support (200) includes an attaching portion (222) which extends in a direction along the load support surface (71f), is inserted into a gap (S) between the tensile material (71) and the attachment portion (87), and is fixed to the attachment portion (87).Type: ApplicationFiled: June 9, 2017Publication date: October 3, 2019Applicant: OKAMURA CORPORATIONInventors: Hiroshi MASUNAGA, Shinpei TOTSUKA
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Patent number: 10334953Abstract: Furniture and a chair include a shielding piece (7b5) which is provided in an operation plate (7b2) or a flange (7a5) and closes a gap generated by the operation plate (7b2) and the flange (7a5) when the operation plate (7b2) has an operation posture. In addition, a chair includes a load support member for a chair, the load support member for a chair includes a frame member which includes a pair of rod members (19) and an extension material (22) which is formed in a bag shape and covers the frame member, a support portion (26) is provided on each of inner surfaces facing each other in the pair of rod members (19), and an interior material (21) having a repulsive force with respect to a load in a surface perpendicular direction is bridged between the pair of rod members (19) by being supported by the support portion (26).Type: GrantFiled: October 23, 2015Date of Patent: July 2, 2019Assignee: OKAMURA CORPORATIONInventors: Hiroshi Masunaga, Yoshinori Isogai, Kouichirou Wakizono, Naoyuki Okuda, Syouichi Izawa
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Patent number: 10264886Abstract: A pivot shaft (10) which is a first shaft member coupled to a supporting member, an inner cylinder (12) which is a second shaft member coupled to a supported member, and an outer cylinder (14) which is a third shaft member are disposed to be approximately coaxial with each other and disposed radially in multiple layers. The pivot shaft (10) and the inner cylinder (12) are coupled to each other through a first rubber-like elastic member (11), and the inner cylinder (12) and the outer cylinder (14) are coupled to each other through a second rubber-like elastic member (13). The total reaction force is increased by restricting the rotation of the outer cylinder (14) by means of an operating pin (19) which is a reaction force adjusting part and thereby adding a reaction force resulting from the second rubber-like elastic member (13) to a base reaction force resulting from the first rubber-like elastic member (11).Type: GrantFiled: January 5, 2016Date of Patent: April 23, 2019Assignee: OKAMURA CORPORATIONInventor: Hiroshi Masunaga
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Patent number: 10263459Abstract: A power supply system includes a plurality of uninterruptible power supplies provided for a load in parallel. The uninterruptible power supplies each include a power supply unit configured to supply the load with power and being larger in capacitance than the load, and a switch provided between the power supply unit and the load. The power supply system further includes a control unit selecting a first uninterruptible power supply of the plurality of uninterruptible power supplies, and setting the switch of the first uninterruptible power supply to the on state.Type: GrantFiled: July 25, 2012Date of Patent: April 16, 2019Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Keisuke Ohnishi, Hiroshi Masunaga
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Patent number: 10263457Abstract: An uninterruptible power supply device (60) does not have a wire connecting a bidirectional chopper (24) to a neutral point (NP). The bidirectional chopper (24) includes first and second capacitors (C11, C12), first to fourth transistors (Q11-Q14), and a normal mode reactor (50). In a discharging mode, a controller (63) causes the second and third transistors (Q12, Q13) to be complementarily turned on and controls the ON period of each of the second and third transistors (Q12, Q13) so that terminal-to-terminal voltages (V11, V12) of the first and second capacitors (C11, C12) are equal to each other.Type: GrantFiled: April 1, 2015Date of Patent: April 16, 2019Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Kazuki Nishimura, Hiroshi Masunaga, Masahiro Kinoshita
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Patent number: 10159350Abstract: A chair is provided in which a seat-receiving member is provided with outward flanges for regulating upward/downward displacement to support left and right lateral edges of a seat plate. Engaging grooves supported by the outward flanges are provided at the respective left and right lateral edges of the seat plate. Warpage allowable parts in which warpage deformation of the lateral edges is allowed without the upward displacement being regulated by the seat receiving member are provided in regions of the left and right lateral edges of the seat plate, in which the regions are located at a rear side from engagement parts between the engaging grooves and the outward flanges. With this constitution, it is possible to prevent the seat plate from being detached from the seat-receiving member while ensuring that, when an user is seated, the sides of the buttocks of the user are reliably held, and thus improve the seating stability of a seat body.Type: GrantFiled: June 6, 2014Date of Patent: December 25, 2018Assignee: Okamura CorporationInventors: Ryo Igarashi, Hiroshi Masunaga