Patent GB-437742-A (GB)
Title: Improvements in and relating to electric stop actions for organs and the like
IPC: G10B3/10
Filed: 1934-05-01
Abstract: 437,742. Organs. TAYLOR, J. I., c/o Compton Organ Co., Chase Road, North Acton, Willesden, London, MIDGLEY, A. H., 9, Priory Hill Avenue, Wembley, Middlesex, and COMPTON ORGAN CO., Ltd., J., Chase Road, North Acton, Willesden, London. May 1, 1934, No. 13143. [Class 88 (ii)] A stop-combination action for an organ comprises two sets of contacts in rows at right angles, the contacts of each row in one set being arranged in pairs with an interposed notch on a bar operated by a " stop selector magnet," and the contacts of each row in the other set being movable into either of two positions in apertures in a controlling strip operated by a manual piston allocated to the combination. To prepare and set the combination, the allocated piston e, Fig. 1 is pressed, energizing a magnet d to move a controlling strip c having apertures f through which upstanding contacts b project. These contacts b normally rest in the right-hand apexes f of the apertures f, opposite notches g<3> in bars g, and are carried into the notches g<3> by the movement of the strip c. The stop-keys of the desired combination are then depressed, each energizing a " stop selector magnet " to move a bar g, thus carrying the contacts b to the other side of the rear portions of the apertures f. On release of the piston e and restoration of the controlling strip c, the contacts b of the desired stops will rest in the left-hand apexes f<1>. A subsequent depression of the piston e brings the combination on, contacts b in apexes f<1> for desired stops either contacting with contact g<1> connected to the " on " magnet k<1> if the stop is " off," or entering notch g3 with no resulting action if the stop is already " on." Contacts b in apexes f for stops not required either contact with contact g<2> connected to the " off " magnet k<2> if the stop is " on," or enter notch g<3> with no resulting action if the stop is already " off." If it is desired to set a newly found combination of stops on a piston already set with a combination, a switch m is first opened to prevent the magnets k<1>, k<2> being energized when the piston e is depressed (which would upset the newly found combination) and each stop is reversed twice. In Fig. 3, each bar g corresponding to a stop carries also two notched contacts g', g<5> connected respectively to the " on " and " off " magnets. Additional upstanding contacts b<1> project through apertures n<1> which are formed in a strip n and are overlapped by conducting rods n<2>, n<3> connected to a supply positive. To set on a manual piston previously allocated to another combination, a combination of stop - keys already " on " (as shown the first and third stops are in this position), a " set piston" p is depressed energizing a magnet o and causing strip n to carry the contacts b against contacts g<4> or g<5>. The manual piston e is then depressed ; a contact b already correctly in an apex f<1> for a wanted stop (e.g. the first) is thus merely moved by strip c into notch g<3>, no action resulting. But a contact b incorrectly in an apex f<1>, for a stop not wanted and therefore not drawn (e.g. the second), contacts with a contact g<1> connected to the " on magnet, moving the bar g to " on " position so that the contact b enters notch g<3> ; this movement of the bar g however carries contact b<1> in contact g5 against rod n<2> energizing the " off " magnet which restores bar g to " off position and carries contact b in notch g3 opposite apex f<2> to which it is transferred on release of the manual piston e. An opposite action takes place to transfer to apex f<1> a contact b incorrectly in an apex f<2> where the stop (e.g. the third) is required. Specifications 378,579 and 436,737 are referred to.