Patent GB-793657-A (GB)
Title: Improvements in type inflating and testing devices
IPC: B60S5/04
Filed: 1956-01-30
Abstract: 793.657. Roadside tyre-inflating plant. EICHENAUER. R. Jan. 30, 1956, No. 2885/56. Class 116 A tyre inflating and testing device is provided with a two way valve 1 having an operating button 5 which when depressed fully, causes air to be supplied in pulses from an inlet 17 to an inflating nipple 34 and when partially depressed causes air to leak away from the tyre being inflated. The valve is controlled by solenoids 2a, 51a adapted to depress the button 5 fully and partially, respectively, and each solenoid is controlled by an automatic timing switch whose operation is so controlled by a relay 81 and contacts 40a, 41a of a pressure gauge that the tyre is first inflated to a little over the desired pressure and air then leaks away until the exact pressure is obtained. The valve 1 comprises valve heads 9. 13 associated with the button- 5 and a further valve head 16 which is pushed off its seating only when the button is fully depressed, at which time head 13 is firmlv seated so that air is supplied to the nipple 34 while the gauge is vented through head 9 being unseated. The gauge includes a small orifice to prevent sudden move-. ments of its pointer 40. When button 5 is. partly depressed air is vented from the tyre since both the heads 9 and 13 are off their seatings, while head 16 is seated. When button 5 is released the gauge is connectedvia unseated head 13 to the tyre, head 9' being seated. Solenoids 2a, 51a act on the button 5 through a common lever 87 whichis moved more by solenoid 2a than by solenoid 51a. Solenoid 2a is supplied with pulses of current by timing switch 38c, the duration of inflation pulses being set from one to ten seconds by a knob 70b. Solenoid 51a is supplied with current pulses by timing switch 37c, the pulses being of about half-second duration. The relay 81 actuates either one or other of the timing switches according to whether it is energized or not. When de-energizedit energizes timing switch 38c to cause air to be supplied in pulses to the tyre Between each of the pulses, the gauge is connected to the tyre and its needle 40 moves in jerks after each pulse until contact 40a meets contact 41a on pre-set pointer 41. When this occurs relay 81 is energized, current being supplied from a transformer 36. and the relay is held energized by a hold circuit through a manually openable switch 100 and contacts of a release relay 82. Timing switch 38c is now de-energized and timing switch 37c energized so that air is released in short pulses from the tyre. The circuit, to timing switch 37c is completed through contacts 40a.. 41a so that when these break, switch 37c is de-energized and leakage of air ceases, the correct pressure having been reached. The nipple 34 may now be removed from the tyre. When nipple 34 is fitted to another tyre relay 81 is de-energized to commence inflation either by depressing switch 100 to open its contacts or by depressing switch 55b on the nipple head which energizes the release relay 82. The latter includes contacts which short-circuit the timing switch 38c so that filling can be effected continuously without automatic operation if switch 55b is maintained depressed. A switch 107 is also provided to manually obtain the effect of contacts 40a, 41a being closed. A flasher lamp 91 indicates when release of air is complete.