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    • 2. 发明专利
    • SCHEME FOR POWER CONSERVATION IN FIRE ALARM SYSTEM
    • CA2013610A1
    • 1990-11-01
    • CA2013610
    • 1990-04-02
    • GENERAL SIGNAL CORPORATION
    • SIROIS, BRIAN D.
    • G08B17/00G08B29/18
    • An arrangement for conserving the alarm-state power supplied to numbers of light emitting devices included in respective addressable terminal units of a fire alarm system or the like. The addressable terminal units are connected to a transmission line or loop; and a loop controller cyclically transmits address signals to the terminal units (polling routine); the controller functions, responsive to received data from those units, to generate an alarm-state display command signal for causing illumination of the light emitting devices of terminal units that are in alarm. In the case where a terminal unit comprises a master transponder to which a group of non-addressable conventional "slave" detectors is connected, the loop controller is programmed to disconnect such slave detector from the loop or line when more than one of them is in alarm. However, in the event of a large number of terminal units at scattered locations being in alarm, a tell-tale signal from each unit is highly desirable. Accordingly, it is arranged that all of their light emitting devices will be capable of indicating an alarm state. To this end, a blinking mode of operation is selected, whereby limited groups of devices (except for one) are turned on in sequence, the "ON" times being the same for all off the devices, but the "OFF" times being varied in dependence on the total number of devices being supplied with power. Consequently, power ON is time-divided among the groups, so that the total power consumed by all groups is no greater than would be consumed by a single group.
    • 7. 发明专利
    • ES2032889T3
    • 1993-03-01
    • ES88104388
    • 1988-03-18
    • GENERAL SIGNAL CORPORATION
    • WEETMAN, RONALD J.HOWK, RICHARD A.
    • B01F3/04B01F7/00B01F15/00B01F7/22
    • A mixer which provides axial flow in a non-uniform flow field, such as may be established by gas which is sparged into a medium being mixed in a tank, and provides large axial flow volume without flooding and withstands variable loads on the blades thereof, thereby providing for reliable operation. The mixer impeller is made up of paddle shaped blades, which near their tips (e.g., at 90% of the radius of the impeller from its axis of rotation) are of a width at least 40% of the impeller's diameter. The blades also having camber and twist. They are formed by establishing bending moments which form the blades into sections which are curved and flat, with the flat sections being at least in the center area of the base of the blades. The hub for attaching the blades to the shaft of the mixer has radially extending arms with flat surfaces. The base of the blades are spaced from the shaft to define areas therebetween. These areas are reduced in size, thereby limiting the passage of sparging gas between the blades and the shaft and the strength of the coupling between the blades and the shaft are enhanced by backing plates of width greater than the width of the arms. These backing plates are fastened between the arms and the flat sections of the blades. Bolts extending through aligned holes in the arms, backing plates and blades provide strong and secure attachment of the impeller blades to the shaft so that the impeller will operate reliably in the environment which provides variable loads on the blade.