A Drive Mechanism as Used in Soap and Foam Pump Dispensers
The piston rod carries a Foam Pump(KEXON) piston and is centered on a trailing piston guide, the piston actuating in a manner known per se as a hose pump for a soap solution. In addition, lateral cheeks providing parallel guidance with a suitable flat part engaging therein, are located beneath the joint head.
A crank mechanism with crank pin projecting from a crank disc and engaging in a guide groove of a push rod is located on the side facing the observer. The push rod is mounted at one end on a swivel pin and has a locking cam′ at its opposing end. A coupling link pivotal about a bearing journal is connected with an interlocking fit at one end to the push rod, a latching pawl locking the two components and in the position shown so the pawl rests with a locking lever on the locking cam′ of the push rod. The latching pawl is in turn mounted at its lower end on a swivel pin. A cam-like spring mount, on which a flat coil spring is supported and presses the locking lever against the push rod and the locking cam′ in this case, is located at the lower end of the coupling link. A joint head in which lateral cams of a piston rod are engaged is located next to and beneath the flat coil spring.
An elevation in which a pivotal cam disc is mounted in a shaft can be seen on the upper part of the assembly angle. A fixing piece holding an upper support of a connecting link in the position shown is located behind the cam disc. This connecting link is guided laterally by means of a lateral guide next to which a leaf spring is inserted and engages with its upper end in a recess of the connecting link and biases the latter in the tilting direction K. A journal bearing let into a further elevation of the assembly angle serves as a pivot point for the possible tilting process in the direction.
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