Patent GB-181103-A (GB)
Title: Improvements in and relating to sounding devices actuated from internal combustion engines
IPC: B60Q5/00
Filed: 1921-03-05
Abstract: 181,103. Constantinesco, G. March 5, 1921. Valves actuated by fluid under control of relay control valve.-In a motor-horn &c. actuated bv the suction of an internal-combustion engine, the area of a passage through which air is drawn from the horn to the engine is automatically controlled so that the suction produced at the horn never exceeds that at which the reed operates effectively. Between the horn h, Fig. 1, and the suction source, which may be the engine induct pipe e or a reservoir gas described in Specification 180,450, ;s inserted a valve controlling device comprising a flattened conical chamber a fitted with central perforated diaphragm b, which is drawn over the opening c leading to the suction source when the suction becomes excessive. The opening c is fitted with a valve m for opening a passage to the horn, mounted on a hollow spindle n to which is also attached a flexible diaphragm o. A pipe p, attached to a connection at the back of the chamber a, leads to an actuating device q comprising a button r which when pressed closes a valve s. The space to the rear of the diaphragm o, is normally maintained at atmospheric pressure through an opening in the wall of the device q, but when the button r is pressed it is acted upon by the suction of the engine or the reservoir g through the channel in the spindle n, drawing back the diaphragm o, which opens the valve m and permits suction to actuate the horn through an opening 1. If the suction becomes excessive, the perforated diaphragm b is pulled towards the opening c, thus decreasing the suction operative upon the horn. A light spring t may be inserted between the diaphragm b and the valve m. A modification is described in which the valve m is operated manually by a chain attached to the spindle n which is not bored in this case. The rubber diaphragm o and the pneumatic device q are dispensed with, and the rear side of the diaphragm b is normally maintained at atmospheric pressure through a hole in the wall of the chamber a. When the chain is pulled, the valve m is opened against the action of a light spring to admit suction to the horn, the diaphragm b being drawn towards the opening c if the suction becomes excessive. In another modification, Figs. 3 and 4, the valve 11 in the controlling device, Fig. 4, is situated on the forward side of the seating, and is normally held closed by the suction of the engine which operates through a channel 14 in the valve spindle, to cause a vacuum in the space 15 and draw back the rubber diaphragm 12 and with it the valve. Air is admitted to the space between the two diaphragms 12, 13, through apertures provided by fitting a ring 17 between the diaphragms, formed with corrugations on the side in contact with the diaphragm 13. When the button, Fig. 3, is pressed, air is admitted from holes around the button to the space 15, through the pipe p (which is of larger bore than the aperture 14) and the spring 16, the diaphragm 12 relapsing and opening the valve 11. If the suction becomes excessive the diaphragm 13 is attracted to constrict the passage c as described in the previous modifications. Specification 1.65,591, [Class 13, Bells &c.], is referred to.