Patent GB-280355-A (GB)
Title: Improvements in or relating to coin-freed mechanism for petrol, oil and like pumps
IPC: G07F13/02
Filed: 1926-11-03
Abstract: 280,355. Slack & Parr, Ltd., and Bryan, W. E. Nov. 3, 1926. Delivery of liquids.-In petrol and other liquid delivery pumps the operation of which is controlled bv coin-freed mechanism of the kind in which the coin is moved forwards by a handoperated plunger to effect the unlocking of the operating mechanism, a slide D moved by the coin controls the position of two opposed pawls C, C<1> which coact with oppositely inclined ratchet teeth on the rack B of the pump piston-rod, Fig. 1, or with a toothed ratchet wheel K, Fig. 12, on the usual operating shaft of the piston-rod. When the slide is moved in after prepayment, it engages a pin C<2> on the pawl C to disengage this pawl and allow the rack to be raised, the pawl C' being at the same time caused to engage the rack by a spring connecting pins C<2>, C<3> on the pawls. The slide is held in its inner position by the edge of a tooth G' on a pivoted arm G engaging a notch D<3> until the rack is raised fully, when a pin B<6> adjustable in a slot B<5> engages the arm G thereby releasing the slide which is returned by a spring. During its return, a notch D<1> on the underside of the slide engages the pin C<3> to release the pawl C<1> and engage the pawl C with the rack. The rack can now be lowered to effect the delivery of the liquid. The inward movement of the slide is effected by pressing a handlever F which, in its inner position, obstructs movement of the pump handle, so that the lever F must be released to allow the coin to drop before the pump can be operated. A lost motion connection B<2>, B<3> is provided between the rack B and piston-rod B<1>. The coin-freed mechanism may be disconnected, so that the pump can be used freely, by pulling the arm G and compressing a spring surrounding its pivot pin, the arm being then turned so that a notch G<2> on its end engages the pin C<2> to hold the, pawl C out of engagement with the rack. In the form shown in Fig. 12, the pawls C, C<1> engage a toothed wheel K which has a lost motion connection with the rack engaging pinion. A pinion N on the operating shaft K<1> drives a wheel N<1> having a face cam N<2> and an adjustable finger N<3>, The finger N<3> disengages the catch arm G when the rack is raised fully, as before described. The cam N<2> rocks a lever 0 to press outwards a, sliding rod P against, the hand-lever F thereby preventing the lever F from being held in its inner position. Tc disconnect the coin-freed mechanism, the pawl C<1> is rocked out of engagement with the ratchet K by an arm C<4>, Coin action, mechanical-connection; testing coins.-A coin inserted through a slot A<1> drops to side stops. A spring-controlled plunger E pressed in by the lever F bears at two points on the coin and presses, it against a knife-edged projection D<2> on the slide D to move the slide. Bad coins are bent in the apparatus and the central projection D<2> passes through washers. Coin-slit closing-devices.-A slide H is moved into the coin slot A<1> when the rack B is raised, Fig. 1, or when the lever 0, Fig. 12, is rocked. The slot A<1> is also closed, when the coin-freed mechanism is disconnected by the arm G or the arm C<4> engaging a pin on the slide H.