Patent GB-190521679-A (GB)
Title: An Improved System and Apparatus for Operating Bulkhead Doors, Hatches or the like.
Inventor: JONES ALLEN PARRY
Filed: 1905-10-24
Granted: 1906-03-15
Abstract: 21,679. Jones, A. P., ["Long Arm" System Co.]. Oct. 24. Door opening and closing apparatus.- The invention is described with reference to bulkhead doors, but is not confined thereto, and consists of improvements on the apparatus described in Specification No. 13,927, A.D. 1904, relating chiefly to the motor control. The doors are closed by electro - responsive means from a distance and controlled by hand locally in opposition to the distant control. A controller switch at the door is operated by the solenoid G<1> to close the door, and may be rocked against the action of the solenoid by the handles M<5>. In the example shown, the drum is in two parts F<3>, F<4>, the part F<4> being loose on the shaft and provided with a tenon f<13>. The part F<3> is held in place by a cam m<1> on the handle shaft operating in conjunction with a spring and sliding piece m<2>, while the part F<4> is maintained in the ' off ' position by the spring G<2>. Contact-fingers k ... k7 engage contact - pieces f . ... . f<8> on the drum. Fig. 4 shows diagrammatically the circuits arranged for two doors, in which the left-hand controller is in position for closing the door by the switch h, and the right-band controller is in position for opening the door by the hand-control. In the first case, the solenoid G<1> has moved the contacts f<7>, f<8>, which are electrically connected to the strips in contact with the fingers k<6>, k<7>. The circuit through the motor B is closed from the positive main through the finger k<7>, the armature of the motor B, the field of the motor, and the finger k<6> to the negative main. This closes the door. In the second case, the hand - control overpowers the electro responsive control, and the circuit is closed from the positive main through the finger k<5>, the armature of the motor B, the fields of the motor, and the segment f<2> to the negative main. The current through the armature is revers:d and the door is opened. Diagrams are also given in the Specification of the operation of the door when the emergency switch is open, and a modification is shown and described in which the control is applied to a compound-wound motor. The controller drum shown in Fig. 3 is a modification of a known form of drum consisting of one piece only, the whole of which is moved by the solenoid G<1>. A limit switch, similar to that described in Specification No. 13,927, A.D. 1904, cuts off the current from the motor in the event of any obstruction to the closing of the door. The controller box D, Figs. 9 and 10, is made water tight, and carries a casing D' for the solenoid G'. The smaller part of the drum is connected to the solenoid plunger and is restored to its initial position by the spring G<2>. An insulating-plate f<15> is placed between the contact-segments f<7>, f<8> to prevent sparking. The control shaft M is provided with sector bevel-wheels since it only turns through a small angle. The doors may be operated in groups or a series of groups or seriatim as described in the Specification referred to above.