Patent GB-190116748-A (GB)
Title: Improvements in Apparatus for Operating Bulkhead Doors, Hatches or the like.
Inventor: JUSTICE PHILIP MIDDLETON
Filed: 1901-08-20
Granted: 1901-12-21
Abstract: 16,748. Justice, P. M., [" Long Arm " System Co.]. Aug. 20. Bulkhead doors, hatches, and the like are operated by electricity, either from a distant point or at the door itself, any predetermined position of the doors, hatches, or the like being indicated by lamp signals. If desired, the doors &c. may also be operated by hand. The vertically-sliding or other door B, Fig. 5, travels in a frame A<1>, and carries a sheath B<1> for the screw C, which engages in a nut B' on the door. Casings D, E, F, mounted on a bed-plate on the bulkhead, contain, respectively, the power gear, the electric motor, and the limit switch for stopping the electric motor when the motion of the door is arrested. The circuit of the electric lamp for indicating the closing or predetermined position of the door is completed by the operation of the pushbutton or like device b<1> by the tappet b, and the shaft I, for operating the power gear by hand, is rotated by gearing in the casing I' actuated by a crank on either end of the shaft i. The doors may be provided with tightening-devices such as A<o>, in which rollers a<4> engage a wedge or inclined surface. The power gear consists of a worm and wheel, the wheel being so mounted that it has a limited play, after the door has stopped, to prevent breakage of the parts. The limit switch has two contact-levers p, p<1>, which are controlled through a cam and rocking shaft actuated by the small movement which the worm-wheel makes after the movement of the door has stopped. The emergency switch consists of a drum R<3> carrying a series of short projections r and two series of longer projections r<1>, r<2>. When the door is open and the parts are in the normal position shown in Fig. 1, the contactpoints 1 to 11 are opposite the middle line o-o on the controller cylinder H<2>, and, the circuits being thus broken at the points 1, 2, 9, 10, and 11, no current can flow to the motor E‹. Should the emergency switch be turned to bring the points t<1>, t<2>, and t<3> in contact with projections on the drum R<3>, the circuit will be closed to run the motor and to close the door. The first movement of the power gear causes the lever p to make contacts at q<7>, q<8>, and, when the door is closed, the power gear actuates the limit switch and breaks the circuit at the contacts g' to q<4>, stopping the flow of current to the motor. The movement of the door while closing may be reversed by turning the cylinder H<2> through 90‹ in one direction, while, by turning the cylinder through 90‹ in the opposite direction, the door may be closed by the controller, the lamp signal V only glowing in this case if a push-button be pressed. Similar arrangements allow of the door being opened. When the controller is brought into the position along the line o<1>-o<1>, the contact-fingers 3,4, and 7 will touch the insulation h<4>, and every single line can be tested without disconnecting any wire whatever. The controller cylinder is returned to its middle position by a spring.