Down-locking pump

Details Down-locking pump Down-locking pump

1980-11-18

1983-01-25

Skaggs, H. Grant

Dispensing

With lock or fastening seal

Plural

222321, 222384, B65D 4734

Patent

active

043698999

ABSTRACT:
When the plunger is fully depressed, radially projecting lugs carried by the plunger adjacent its normally upper end may be received within corresponding notches in a collar through which the plunger reciprocates, whereupon rotation of the plunger in a clockwise direction moves the lugs under overhanging shoulders of the collar so as to prevent extension of the plunger until it is intentionally unlocked from the collar. A total of three lugs are utilized so as to provide three-point, stabilized retention of the plunger in its locked-down condition, and one of the lugs and its corresponding notch is smaller than the other two so that the plunger can be locked only when it is in a certain, predetermined rotative position relative to the collar aligning the down-sized lug and notch. Each of the shoulders is provided with a lower, lug-engaging, inclined surface which bears against its corresponding lug with progressively increasing force for fluid-tight sealing purposes as the plunger is rotated into a fully locked condition, there being abutments associated with the shoulders blocking movement of the lugs beyond positions corresponding to the fully locked and rotated position of the plunger.

REFERENCES:
patent: 2083058 (1937-06-01), De Weal
patent: 2088790 (1937-08-01), Huthsing
patent: 2103932 (1937-12-01), Bernhardt
patent: 2846124 (1958-08-01), Stewart et al.
patent: 3086716 (1963-04-01), De Kolb
patent: 3321111 (1967-05-01), Jellinek
patent: 3422996 (1969-01-01), Lipman
patent: 3706401 (1972-12-01), Gach
patent: 4162746 (1979-07-01), Anderson et al.

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