GB878007A - Flame thrower - Google Patents

Abstract

878,007. Flame throwers. CANADA, MINISTER OF NATIONAL DEFENCE. Oct. 1, 1951 [Aug. 3, 1951], No. 22863/51. Class 119. A flamer thrower comprises a barrel 10, a pintle 29 guided by vanes 33 and movable as a unit within the barrel, a pintle piston 35 with an enlarged head 36 movable within a cylinder block 22, the latter being secured to an elbowshaped gun body 16 to which the flame fuel is supplied, and means for supplying and exhausting gas to and from the cylinder 39 of the block 22 in order to prevent or allow the flame fuel to be ejected past the conical tip 31 of the pintle. In the construction shown, the body 16 is pivoted at 40, 40a, to the arms of a stirrup 42 which is pivoted at 43 to a bar 44, the bar being connected to a supporting structure by screw and slot connections 45, 46. Near one of the controlling hand grips 82, 83, is a trigger 85 which, when pulled, produces three results in timed sequence. The first result is to retract, by means of a piece 90 on the trigger rod 84, a spindle 91 whose bevelled surface 94 then serves to close a micro-switch 95. Cables 122 lead from this switch to electrodes 134, 135, to produce a continual electric spark against a petrol nozzle of an ignition assembly 123 near the forward end of the barrel 10. The second result is to permit the supply of petrol to the ignition assembly by way of a conduit 121 from a'supply source connected at 101, Fig. 3, to a control block 48, which is secured to the cylinder block 22. The flow is normally prevented by a valve 100 on a valve stem 93, but when the trigger is pulled and immediately after the closing of the micro-switch 95, a face 116 of the spindle 91 engages adjustably positioned nuts 117, 118, on the valve stem to open the valve. The petrol issuing from the petrol nozzle is ignited by the spark. The third result produced by continued movement of the trigger is to release the normal supply of gas under pressure to the cylinder 39 and to open the communication between the cylinder and the atmosphere. As shown in Fig. 3, the control block 48 has a cylinder 57 which communicates at 50 with the cylinder 39 and which is fitted with a valve body 61 having a groove 75 which normally communicates with a supply of pressure gas. The gas reaches the cylinder 39 by way of ports 76 and bore 62 in the valve body and thence by way of the passage 50. When the trigger is pulled a screw 87 carried by a plate 851 at the end of the trigger rod acts on a rod 65, which serves to move the body 61 so that groove 75 no longer registers with the gas supply and which at the same time connects the cylinder 39 with the atmosphere by way of passage 50, bore 62, radical bores 77 in the valve body, a space 78, a bore 70 of a valve plug 66, and radial bores 69 in the head of the plug. The pressure of the flame fuel in the barrel 10 by pressing on the front face of the pintle piston 35 can now move the pintle rearwards to enable the fuel to issue from the nozzle tip 14 and to become ignited by the ignition flame.