Patent GB-125086-A (GB)
Title: Improvements in or relating to Mountings for Heavy Ordnance Carried on Submersible Boats or Ships.
Inventor: DAWSON ARTHUR TREVOR
IPC: F41A27/10
Filed: 1916-02-02
Abstract: 125,086. Dawson, Sir A. T., and Horne, J. Feb. 2, 1916. Ports. - Relates to mountings for heavy ordnance carried on submersible vessels, and of the kind described in Specification 124,454, in which, prior to submersion of the vessel, the gun carriage is moved rearwards within its gun house and the gun port is then closed by a slidable water-tight door. According to the invention, the door, on reaching its closing position, is given a transverse movement to force it against a suitable seat surrounding the gun port. In the form shown in Figs. 1, 3, and 4 the sliding door a is mounted on rollers b, c, running on guide ways d carried by the front wall f of the gun house and is raised and lowered through the medium of links i by means of a hydraulic press h. When the door reaches its closing position, the rollers b register with recesses k in the guideways and permit the door to be moved transversely on to an india-rubber seating j by means of a hydraulic ram m carrying wedges n for actuating T-bolts r. These bolts are mounted so as to move on rollers o in a member p budging the rear of the gun port which member together with the T-bolts can slide longitudinally relatively to the door for a distance equal to half the travel of the door. The door-sliding press h and the door-tightening press m are operated in proper sequence by hydraulic pressure from suitable mains, or, as in the arrangement shown, by pneumatic pressure hydraulically transmittec. For this purpose pneumatic pressure supplied by a pipe v, Fig. 4, is, according to the position of a hand-lever a<10> which controls pressure and exhaust valves a<1>, b<1>, either admitted to a chamber z to open the door or to an adjacent chamber y to close the door. The movement of the lever a<10> to the dotted line position opens the right-hand pair of valves a<1>, b<1> and admits air under pressure through a pipe x into the space above the liquid in the chamber z. The resulting liquid pressure acts through a pipe c<1> to lower the ram m and untighten the door, this ram at the lower end of its movement actuating a valve t to admit pressure to the press h ta lower the door. The presses meanwhile exhaust through pipes g<1>, h<1> into the chamber y, the air in this chamber passing to the atmosphere through the open exhaust valve b<1> and a passage n<1>. To close the door, the lever a<10> is moved to the full line position and the air pressure now admitted to the chamber y acts by way of the liquid in pipes g', h<1> to raise the door. The tightening-press is actuated when the door on reaching its raised position contacts with a tappet j<1> and thereby through a rod k<1> opens a valve u. The following alternative methods of effecting the tightening movement of the door are described: (1) a number of small hydraulic presses are arranged to operate directly on the door; (2) cams, actuated through suitable gearing from a hydraulic press, are adapted to operate directly on the door; (3) toggle-levers or arms acting on the door are operated by means of sliding bars actuated by a hydraulic press; (4) the moving element p<11>, Figs. 20 and 21, of the door-sliding press is arranged to move relatively to the door a and by means of projections r<11> engaging wedge surfaces v<11> force the door on to its seat. In this arrangement, the cylinder p<111> of the door-sliding press is formed integral with the element p<11> the projections r<11> of which convey the sliding movement to the door by engaging recesses s<11>. The door is moved to and from the element p<11> to engage and disengage the projections r<11> by the contact of rollers b on the door with cam surfaces on the fixed frame,