Importance

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Abstract

A liquid repetitive dispensing device consisting of a main body containing an elongated square ratchet bar slidably engaged with the main body, the ratchet bar having two adjacent longitudinal faces having ratchet teeth of different pitch. A push button is provided in the main body having an inclined bore containing a spring-biased pawl drivingly engageable with the ratchet teeth responsive to inward movement of the push button. An abutment bushing surrounds and conformably receives the ratchet bar and is adjustably rotatably received in the main body. The bushing is formed with inclined bottom cam surfaces extending toward the ratchet teeth and being engageable by the pawl. The degree of driving engagement of the pawl with the teeth is in accordance with the axially adjusted position of the bushing. A yieldable detent in the main body is selectively receivable in axially spaced recesses in the bushing to lock it in adjusted position relative to the main body. The main body has a bracket with pairs of spaced lugs for frictionally connecting it to the barrel of a syringe, and the top end of the ratchet bar has a handle bar with a transversely grooved outer end and spaced lower lugs for connecting the top of the ratchet bar to the syringe plunger. The ratchet bar has a bottom cylindrical portion receivable in a square bore in the bottom portion of the main body when the ratchet bar is elevated to its uppermost position for filling the syringe. The bushing is yieldably held against rotation, but can be manually rotated to cause the ratchet bar to be rotated so as to change the ratchet teeth engageable by the pawl and thereby to vary the basic dispensing rate. Axial adjustment of the bushing varies the pitch multiple available, whereby at least four different dispensing rates may be provided.

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First Claim