https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=58982&pn=331,178 Injector Patentee: John Sellers Bancroft - Philadelphia PA Granted:1885-11-24

Abstract: Such injectors have usually been constructed with one overflow-opening between the end of the combining-tube and the receiving end of the delivery-tube, this opening discharging into an overflow-chamber provided with a check-valve to prevent an indraft of air when the injector is working, which overflow-opening will hereinafter be called the "forward overflow." Combining-tubes have also been constructed with two overflow-openings, and such openings will be designated hereinafter in the order they occur with the movement of the jet-that is to say, that one nearest the delivery-tube is the forward overflow, and that farthest from the delivery-tube is the rear overflow-consequently the large end of the combining-tube is in the rear of the rear overflow. Now, in order to obtain the greatest efficiency as a boiler-feeder, the discharging end of the combining-tube must be but little larger than the smallest diameter of the delivery-tube, and the overflow-opening is limited thereby; but with this proportion the jet will not form, and the instrument will not operate until the supply of water is reduced very much below the maximum quantity of water the injector is capable of delivering when at full work, so that to start the water- supply must be diminished, and when in operation must be increased until the full capacity is attained. This small size of over- flow-opening, moreover, necessitates great care in the admission of steam to the instrument, for, the area of the steam-nozzle being necessarily much larger than the overflow-opening, it will be evident that the full volume of steam would not be able to escape through this opening without, producing considerable back-pressure in the water-supply chamber, which would prevent the water from entering; hence the steam must not be admitted faster than the gradually-forming jet is able to unite with it. Claim: In an injector, the combination, in one single overflow-chamber, of a forward over-flow-space located near the smallest diameter of the delivery-tube, and a rear overflow-space io located in the combining-tube at a point in the rear of that where the cross-sectional area of this converging tube contracts to less than one and four-tenths that of the smallest cross-sectional area of the steam-nozzle.
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