GB570438A - Improvements relating to machines having opposed synchronised free pistons - Google Patents

Abstract

570,438. Free-piston gas generators. PESCARA, R. P. July 27, 1943, No. 12234. Convention date, Aug. 4, 1942. [Class 7 (i)] A. machine with opposed free pistons, such as a gas generator comprising a compressor which supplies air to the internal-combustion power cylinder driving its piston, the combustion products and excess scavenge air being utilized for power production, is synchronized by means including crossed levers, one of which is at right angles to the piston axes at the outer 'dead-point and the other is at right angles at the inner dead-point, the first lever-actuating devices, e.g. for detecting an abnormal expansion stroke and the second lever-actuating devices such as a fuel pump or a compression stroke indicator. The synchronizing means shown comprises rods 9, 9a connected through levers 10, 11 and links and connecting rods 13, 13a, and rods 9<1>, 9<1>a similarly connected through levers 10', 11<1>, links and connecting rods ; the rods 9, 91 are joined to a compressor piston 4 integral with a motor piston 1, and the other rods 9<1>, 9<1>a are joined to a bridge 1b provided on the opposed power piston 1a. The rods 9 are provided with shoes 9b slidable in guides 9c, and these guides may have holes through which the pin connecting the rod 9 to its shoe and synchronizing lazy-tongs may be removed. The lever 10 is rigidly connected to a rod 14 carrying a cam 14a actuating the pump 15 and a safety device 16, while the lever 11<1> is connected rigidly,to a shaft 14<1> operating an inner dead-point safety device 17 through a cam 14<1>a. The devices 16, 17 are provided with valves 18 actuated by the cams through tappets and permitting compressed air from a reservoir to flow from chambers 18a to a pipe 18b connected through a branch 19b with a chamber containing a piston 19 on the pump tappet, the pump being thus put out of action during abnormal strokes. Specification 525,274 is referred to.