JPS6114054U - fire damper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional fire damper, Fig. 2 is a sectional view of an embodiment of the present invention, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a sectional view of a conventional fire damper.
The figure is an enlarged view of the main part of FIG. 2, FIG. 5 is a perspective view of the shaft used in the embodiment of the present invention, and FIG. 6 is a perspective view of the same hook. 19: Duct, 20: Damper, 23: Torsion coil spring, 25: Operation lever, 25b: Stop arm, 26
: Stopper device, 31: Shaft, 32: Spring, 33: Hook, 34: Pin, 35: Shape memory alloy spring.

Claims (1)

[Claims for Utility Model Registration] A damper that opens and closes a duct by its own rotation; a member that biases the damper in the closing direction; an operating lever connected to the rotation shaft of the damper; A fire prevention damper comprising a stopper device that restricts rotational movement and holds the damper in an open state, wherein the stopper device has a shaft portion that restricts or releases the restriction on rotation of the operating lever by sliding itself. , a spring that biases the shaft in a direction to release the restriction of the operating lever by the shaft, and a hook that holds the shaft in a state in which the shaft restricts rotation of the operating lever while the movement of the shaft is caused by the spring; A pin that is integrally provided on the shaft and engages with the hook, and a shape memory alloy that is inserted into the duct and recovers its shape when the inside of the duct reaches a predetermined temperature and releases the connection between the hook and the pin. A fire damper characterized by comprising: a member;