US3613952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid dispenser with adjustable stroke piston and register
Assignee: Cole-Parmer Instrument Co LLC
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Filing: 1970-04-23
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Granted: 1971-10-19
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Expires: 1990-04-23
Abstract
Abstract A digital dispenser comprises a cylinder-plunger assembly for accurately dispensing a measured amount of fluid from said cylinder. A rotatable screw jack is adapted to adjust the position of a stop member to define the length of the plunger stroke. A numbered wheel assembly is operatively connected to the screw jack through a rotatable knob whereby the stroke is set by rotating the knob and the desired volume appears on the numbered wheel assembly as a digital readout.
Inventors
- 👤 Raymond E Portyrata
- 👤 Roger Gilmont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
B; B65; B65B; B65B3/00; B65B3/26; B65B3/30; B65B3/32; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/0224; B01L2300/00; B01L2300/02; B01L2300/025; B01L2300/026
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
165 words
A digital dispenser for dispensing a measured amount of fluid from a cylinder having an opening for dispensing fluid at a first end, comprising a plunger adapted to be slidably and sealingly received within the second end of said cylinder, means for moving said plunger axially toward said first end of said cylinder, means for stopping said plunger after travelling a given distance toward one end of said cylinder, and means for adjusting the position of said stop means so as to vary said given distance, said adjusting means comprising a rotatable, hollow internally threaded adjusting shaft concentrically disposed with respect to said stop means and threadingly engaged therewith, whereby said stop means moves axially along said adjusting shaft as said adjusting shaft is rotated on said stop means, and digital readout means comprising numbered wheel means directly mounted on said adjusting shaft and rotatable therewith, whereby adjustment of said stop means to vary said given distance is digitally represented by said numbered wheel means.
Claim 2
Dependent Claim
165 words
A digital dispenser for dispensing a measured amount of fluid from a cylinder having an opening for dispensing fluid at a first end, comprising a plunger adapted to be slidably and sealingly received within the second end of said cylinder, means for moving said plunger axially toward said first end of said cylinder, means for stopping said plunger after travelling a given distance toward one end of said cylinder, and means for adjusting the position of said stop means so as to vary said given distance, said adjusting means comprising a rotatable, hollow internally threaded adjusting shaft concentrically disposed with respect to said stop means and threadingly engaged therewith, whereby said stop means moves axially along said adjusting shaft as said adjusting shaft is rotated on said stop means, and digital readout means comprising numbered wheel means directly mounted on said adjusting shaft and rotatable therewith, whereby adjustment of said stop means to vary said given distance is digitally represented by said numbered wheel means.
Claim 3
Dependent Claim
74 words
The digital dispenser of claim 1, wherein said means for moving said plunger comprises a plunger rod operatively connected to said plunger at one end and having a stop portion from the other end, and said stop means comprises a hollow externally threaded shaft concentrically and slidingly mounted on said plunger rod and adapted to engage said stop portion of said plunger rod when said plunger rod has moved said plunger said given distances.
Claim 4
Dependent Claim
25 words
The digital dispenser of claim 2, further comprising adjustable lock means for locking said adjusting shaft against rotation after said stop means has been adjusted.
Claim 5
Dependent Claim
63 words
The digital dispenser of claim 2, wherein said numbered wheel means comprises a plurality of numbered wheels, the first of which is rigidly mounted on said adjusting shaft and rotatable therewith, each of the others being rotatably mounted on said adjusting shaft and successively operatively connected to its adjacent numbered wheel by transfer means adapted to transfer rotational motion in a predetermined ratio.
Claim 6
Dependent Claim
33 words
The digital dispenser of claim 2, further comprising a hollow casing mounting said plunger rod and said stop means and adapted at one end to operatively engage said second end of said cylinder.
Claim 7
Dependent Claim
23 words
The digital dispenser of claim 5, further comprising means for preventing the axial movement of said adjusting shaft with respect to said casing.
Claim 8
Dependent Claim
60 words
The digital dispenser of claim 6, wherein said adjusting shaft comprises a hollow shaft concentrically mounted on said stop means and having an internally threaded portion adapted to mate with the external threads on said stop means and having a protrusion, said means for preventing axial movement of said adjusting shaft comprising means on said casing operatively engaging said protrusion.
Claim 9
Dependent Claim
63 words
The digital dispenser of claim 7, wherein said numbered wheel means comprises a plurality of numbered wheels, the first of which is rigidly mounted on said adjusting shaft and rotatable therewith, each of the others being rotatably mounted on said adjusting shaft and successively operatively connected to its adjacent numbered wheel by transfer means adapted to transfer rotational motion in a predetermined ratio.
Claim 10
Dependent Claim
33 words
The digital dispenser of claim 1, further comprising a hollow casing mounting said plunger rod and said stop means, and adapted at one end to operatively engage said second end of said cylinder.
Claim 11
Dependent Claim
23 words
The digital dispenser of claim 9, further comprising means for preventing the axial movement of said adjusting shaft with respect to said casing.
Claim 12
Dependent Claim
49 words
The digital dispenser of claim 10, wherein said numbered wheel means comprises a plurality of numbered wheels, the first of which is rigidly mounted on said adjusting shaft and successively operatively connected to its adjacent numbered wheel by transfer means adapted to transfer rotational motion in a predetermined ratio.
Claim 13
Dependent Claim
25 words
The digital dispenser of claim 10, further comprising adjustable lock means for locking said adjusting shaft against rotation after said stop means has been adjusted.
Claim 14
Dependent Claim
63 words
The digital dispenser of claim 12, wherein said numbered wheel means comprises a plurality of numbered wheels, the first of which is rigidly mounted on said adjusting shaft and rotatable therewith, each of the others being rotatably mounted on said adjusting shaft and Successively operatively connected to its adjacent numbered wheel by transfer means adapted to transfer rotational motion in a predetermined ratio.
Claim 15
Dependent Claim
22 words
The digital dispenser of claim 10, further comprising means for preventing the rotation of said stop means with respect to said casing.
Claim 16
Dependent Claim
36 words
The digital dispenser of claim 14, wherein said means for preventing rotation of said stop means comprises an axially extending keyway on said casing and a key portion on said stop means received within said keyway.
Claim 17
Dependent Claim
29 words
The digital dispenser of claim 14, further comprising means fixedly connected to said casing for stopping the travel of said plunger away from said first end of said cylinder.
Claim 18
Dependent Claim
29 words
The digital dispenser of claim 9, further comprising means fixedly connected to said casing for stopping the travel of said plunger away from said first end of said cylinder.
Claim 19
Dependent Claim
60 words
The digital dispenser of claim 1, wherein said numbered wheel means comprises a plurality of numbered wheels, the first of which is rigidly mounted on said adjusting shaft and rotatable therewith, each succeeding wheel being rotatably mounted on said adjusting shaft and operatively connected to its adjacent wheel by transfer means adapted to transfer rotational motion in a predetermined ratio.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |