Patent GB-191500836-A (GB)
Title: Improvements in Fire Extinguishers.
Inventor: HANSEN AUGIE LUIS
IPC: A62C11/00
Filed: 1915-01-19
Granted: 1915-08-19
Abstract: 836. Hansen, A. L. Jan. 19. Piston apparatus for discharging receptacles.- In a portable fire-extinguisher, the piston is moved by a winding- mechanism comprising a cable connected to the piston and operated by means on the outside of the container. The piston 13, Fig. 4, is secured by a cable 29 to a winding- drum 23 mounted on a shaft 22, which is supported in a U-frame 21 and engages slots 20 in a U- frame 19 secured to the cover 11 of the container 10. On the shaft 22 is mounted a worm-wheel 24, which is raised into gear with the worm 17 by screwing the nozzle frame 27 into a sleeve 25 supporting the frame 21. The base of the frame 27 is bevelled to engage a similar bushing 15, in which the sleeve extends. The worm shaft is rotated by a crank-arm 18, Fig. 1, through ratchet gear to prevent rotation in the wrong direction. In order to prevent breakages or bending of the arm, and lock it in normal position, it is normally held in a slot 68, Fig. 5, in a member 67 pivoted on a pin 71, which is carried by a band 69 secured on the container. The slot has a projecting shoulder 74 to prevent accidental displacement of the crank, and the rear of the member 67 has a shoulder 72 normally engaging the nut 73 of the bolt 70 to prevent rotation of the crank in the wrong direction in starting the apparatus. The valve is held on its seat by a member 60, Fig. 1, pivoted at 61, one end of which 60<a> projects over the valve and engages the groove between the nozzle frame 27 and cap 53 and carries a lug 62 to limit the closing movement and to prevent rotation of the member 60 in the wrong direction, and the other end 60<b> of which is connected to the end 18<a> of the crank by a sealed wire 66 to discourage tampering with the apparatus. The nozzle frame, in the form shown in Fig. 7, is provided with a series of holes 48 connecting the container with the space between a pair of annular ridges 46, 47, on to which the leather washer 52 on the valve 49 is normally pressed by the locking- member 60. When the locking-member is released by operating the crank, the pressure of the liquid lifts the valve, a bevelled edge 57 thereon engaging a bevelled edge 58 on the aperture in the cap 53, so as to prevent leakage in case any liquid escapes into the cap. In the form shown in Fig. 9, the valve is formed on the member 60<a>, which presses against a washer 85 on the nozzle frame 82. The piston is reset by removing the nozzle frame so as to disengage the worm gear, and then rotating a wheel 34, which is connected by ratchet gear to a spindle 33 carrying a reel 32, to which one end of the cable 38 is secured. The other end of the cable may be secured to the piston ; or the cable may pass over a pulley 39 carried by a swivelling frame 40 and be secured at its other end either to the container or, as shown, to a ring 42 loosely mounted between the walls of the reel. The lower internal edge of the ring engages the outermost winding on the cable, so that by the aid of an indicator 42<c> and scale 43, the amount of liquid in the container can be ascertained at any time.