Hitachi, Ltd.

Japan Ae Power Systems Corporation

Nisshin Steel Co., Ltd.

Nippon Steel Nisshin Co., Ltd.

Kenichi Okubo

Hideo Kawamoto

Hiroaki Hashimoto

Keiji Izumi

Norimasa Miura

Katsunari Norita

Yuugo Oota

Tomoyuki Nagatsu

Tetsu Ishiguro

Daisuke Ebisawa

Motonori Kurotaki

Shuichi Sugita

Makoto Hirose

Takashi Iida

Noriyuki Yaginuma

Go Kobayashi

Keita Noguchi

Shunta Mori

Masahiro Yaegashi

The present invention relates to a metal roofing materialthat is arranged on an eave-side metal roofing material in an eave-ridge directionof a roof so as to overlap the metal roofing material and the eave-side metal roofing material. The metal roofing material includes a front substratemade of a metal sheet and including a body portionformed in a box shape; a back substratearranged on the back side of the front substrateso as to cover an opening of the body portion; a core materialfilled between the body portionand the back substrate; and at least one plate reinforcing memberthat is embedded in the core materialat a position closer to the back substratethan a top plate of the body portionor that is disposed in contact with the outer surface of the back substrate

Metal roofing material and roofing method

A body portionof a front substrateincludes first side surfacesand second side surfaces, each of the second side surfacesbeing arranged at a position protruding toward the outer side along a width directionthan the first side surfaceEach of the first side surfacesincludes a side flangeA protruding width of the side flangefrom the first side surfaceis equal to or less than a protruding width of the second side surfacefrom the first side surfaceA metal roofing memberis arranged on a roof base while abutting at least the second side surfaceagainst a second side surface of other metal roofing member.

Metal roofing material, and roofing structure and roofing method using same

A metal roofing memberis disposed side by side with another metal roofing member on a roof base. The metal roofing memberhas a box-shaped front substratemade of a metal sheet, a rear substratedisposed on the rear side of the front substrate, so as to cover an opening of the front substrate, and a core materialmade from a foam resin and filled in between the front substrateand the rear substrate. The front substrateresults from forming the metal sheet into a box shape. The front substratehas a side wall portion that is continuous in the circumferential direction and is formed by performing drawing or bulging processing on the metal sheet. The front substratehas a height of 4 mm to 8 mm.

Metal roofing member, production method thereof, roofing structure and roofing method

A metal roofing memberhas a front substrate, a rear substrateand a core material. The front substrateis made of a metal sheet. In the front substrate, a box-shaped body portionand a flange portionextending from the body portionare provided. The flange portionis formed by folding back, over the rear side of the front substrate, of a metal sheetextending outwards of the body portionin a directionperpendicular to a height directionof the body portion, from a lower edge of the body portion, in such a manner that the metal sheetwraps around the rear substrate. The metal roofing memberis disposed on a roof base, with the flange portionbutting against a flange portionof another metal roofing member.

Metal roofing member, and roofing structure and roofing method using same

A gas circuit breaker includes a breaking unit tank incorporating a fixed electrode and a movable electrode, a spring operation device including a breaking spring and a closing spring and configured to move the movable electrode, and a mechanism unit configured to couple the movable electrode side and the spring operation device side and transmit power received from the spring operation device to the movable electrode. The spring operation device is supported by a frame. The frame is fixed to a rear plate provided in a mechanism unit frame of the mechanism unit. A breaking spring case and a closing spring case of the spring operation device are fixed to pedestals via a plate memberand a support section

Gas circuit breaker and breaker for gas insulated switching device

The gas circuit breaker is made up of a fixed contact, a movable contact, a sealed tank having the fixed contact and the movable contact therein, an operating mechanism for driving the movable contact, and a mechanism unit for housing a link mechanism for connecting the operating mechanism with the movable contact. The operating mechanism is made up of an opening spring and a closing spring, cases for covering respective peripheries of those elastic bodies, a control mechanism for holding and freeing the driving force of the elastic body, and a link mechanism for conveying the driving force of the elastic body to the movable contact. The opening spring is laterally disposed in the axial direction between the link mechanism and the control mechanism. An integral flange is provided on an opening spring case and a closing spring case.

Gas circuit breaker

A circuit breaker () formed with a sealed tank () having a breaker section and an operating mechanism () is laterally arranged in a lengthwise direction and is fixed to a frame (), and above the circuit breaker, main bus containers () are provided, substantially orthogonally to an axial direction of the circuit breaker (). Operating mechanism-side working space (B) and breaker section-side working space (C) are provided respectively above the operating mechanism () and the sealed tank (), and a hand hole () is provided on an upper surface of the sealed tank (). A connecting pin () is provided in a link mechanism connecting the operating mechanism () and the movable contact (), and an operating mechanism-side working hole for accessibility to the connecting pin () from the operating mechanism-side working space (B) is provided.

Gas-insulated switchgear

The gas circuit breaker includes a main shaft which is a rotating shaft of a main lever connected to an opening spring, a cam shaft which is a rotating shaft of a cam connected to a closing spring, a main shaft holding member which holds the main shaft, a cam shaft holding member which holds the cam shaft, and a bracket which holds the main shaft holding member and the cam shaft holding member. A through hole is provided in a portion of the bracket between the main shaft holding member and the cam shaft holding member, and a heat generating member is provided at least on a portion of the through hole.

A circuit breaker of different interruption speeds, and a spring operation mechanism is standardized for designing and manufacturing the circuit breaker. The circuit breaker has a power transmission mechanism for driving a movable contactand a fixed contactand an interruption springthat imparts a driving force to separate the contacts through the power transmission mechanism. A latch mechanism restricts movement of the power transmission mechanism, and a pull-out operation section releases the restriction of the power transmission mechanism by the latch mechanism. The pull-out operation section is arranged to oppose a first arm of a lever to rotate the first arm. The lever is arranged so that a tip of a second arm is able to engage with and rest on the latch mechanism, and release the restriction of the power transmission mechanism by the latch mechanism.

Circuit breaker

In an interrupter of a gas circuit breaker that uses springs as a driving source, a contact having a fixed contact and movable contact is opened and closed so as to turn on and off electric power. An operation unit generates driving force for driving the movable contact. A link mechanism interconnects the operation unit and interrupter. The link mechanism has a first lever linked to the operation unit, a second lever linked to the movable contact, and a rotational shaft to which the two levers fit. The operation angle of the first lever with respect to a direction parallel to the motion direction of the movable contact differs depending on whether the contact is open or closed. The gas circuit breaker operates at high speed without the energy of the driving source being increased.

Gas circuit-breaker

Disclosed is a hydraulic operating apparatus for switch with which it is possible to constantly obtain a stable interrupting performance at the time of high-speed successive operations. Closing and interrupting pressure accumulators comprise closing and interrupting pressure accumulation pistons, and closing and interrupting pressure accumulation springs for biasing the closing and interrupting pressure accumulation pistons in pressure accumulation directions, respectively. The closing and interrupting pressure accumulation springs exert, on the closing and interrupting pressure accumulation pistons, forces corresponding to received pressures acting on the closing and interrupting pressure accumulation pistons from closing and interrupting pressure accumulation chambers in a steady state. The closing pressure accumulator and the interrupting pressure accumulator are independently constituted for closing and for interrupting, respectively.

Hydraulic operating apparatus for switch

A gas-insulated switch equipped with a fixed contact and a moving contact that can contact with and separate from the fixed contact, wherein a single shock absorber absorbs the shock in both the breaking action and the closing action of the moving contact.

Growing community of inventors

Tokyo, Japan

Kenichi Okubo