| 摘要 |
A nozzle for use with a fire hose is capable of varying a discharge pattern while maintaining the total water discharge amount at a fixed level. A first tube 4 is connected to a fire hose, a second tube 5 is screwed onto the first tube, and a throttle valve 40 is disposed on the inside of the second tube. A throttled portion 10 between the second tube and the throttle valve maintains the total water discharge amount at a fixed level. The position of the second tube 5 is varied by rotating a grip 42 , and thus the total water discharge amount setting is varied. A third tube 13 is screwed onto the second tube, and a fourth tube 14 is screwed onto the third tube. The position of the third tube 13 is varied by rotating a grip 60 , and thus the discharge pattern is varied. The position of the fourth tube 14 is varied by rotating a grip 66 , and thus the flow rate of a self-protection water spray is regulated. The throttled portion 10 maintains the total water discharge amount at a preset level even when the discharge pattern or the flow rate of the self-protection water spray is varied.
|
