Patent US3751975A successfully refreshed from Google Patents.
Patent US3799406A successfully refreshed from Google Patents.
US3799406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid injection apparatus for successive injection of equal metered volumes
Assignee: SLM Instruments Inc
•
Filing: 1973-02-16
•
Granted: 1974-03-26
•
Expires: 1993-02-16
Abstract
Abstract An apparatus for operating a liquid dispensing syringe in successive discrete equal forward strokes to thereby dispense corresponding equal successive amounts of liquid. The apparatus consists of a support in which the syringe is clamped in alignment with an actuating rod. The end of the rod is connected to the syringe plunger. The rod is connected through a unidirectional ball and cone coupling assembly and a coupling bar to the piston rod of an air-operated cylinder assembly arranged parallel to the actuating rod. The coupling bar extends through a yoke on which is mounted a micrometer for accurately establishing the reset position of the coupling bar, and thereby setting the length of the dispensing stroke of the syringe plunger.
Inventors
- 👤 John P St
- 👤 P Priarone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:47
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/0234
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
181 words
An apparatus for operating a liquid dispensing syringe in successive equal ejection strokes to thereby dispense corresponding equal successive volumes of liquid comprising a support including an elongated block member, means on the support defining a seat to receive a syringe parallel to said block member, means to hold the syringe in said seat, an actuating rod member axially aligned with said seat, means movably supporting said actuating rod member for reciprocating movement in the same axial direction as said seat, means to connect said actuating rod member to the plunger of a syringe mounted in said seat, a reciprocatory driving means arranged parallel to said block member, a driving bar member extending transverse to said block member and being rigidly connected to said reciprocatory driving means, means including a unidirectional coupling assembly drivingly connecting said driving bar member to said actuating rod member only for incremental unidirectional liquid ejection movement of said actuating rod member, and spaced stop means carried by said elongated block member and being engageable by and limiting ejection and reset movement of said driving bar member.
Claim 2
Independent Claim
181 words
An apparatus for operating a liquid dispensing syringe in successive equal ejection strokes to thereby dispense corresponding equal successive volumes of liquid comprising a support including an elongated block member, means on the support defining a seat to receive a syringe parallel to said block member, means to hold the syringe in said seat, an actuating rod member axially aligned with said seat, means movably supporting said actuating rod member for reciprocating movement in the same axial direction as said seat, means to connect said actuating rod member to the plunger of a syringe mounted in said seat, a reciprocatory driving means arranged parallel to said block member, a driving bar member extending transverse to said block member and being rigidly connected to said reciprocatory driving means, means including a unidirectional coupling assembly drivingly connecting said driving bar member to said actuating rod member only for incremental unidirectional liquid ejection movement of said actuating rod member, and spaced stop means carried by said elongated block member and being engageable by and limiting ejection and reset movement of said driving bar member.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1, and wherein said reciprocatory driving means comprises a fluid pressure cylinder on said support having a reciprocatory piston rod, said driving bar member being secured to said piston rod.
Claim 4
Dependent Claim
42 words
The apparatus of claim 1, and wherein said reciprocatory driving means comprises a fluid pressure cylinder on said support extending substantially parallel to said rod member and having a reciprocatory piston rod, said driving bar member being secured to said piston rod.
Claim 5
Dependent Claim
78 words
The apparatus of claim 1, and wherein said unidirectional coupling assembly comprises a tubular body secured to said driving bar member and coaxially receiving said rod member, said tubular body having a conical recess flaring in the direction of ejection movement, a plurality of clutch balls in said recess engaged between said rod member and the wall of the conical recess, and spring means normally urging the balls toward wedging engagement with said rod member and said wall.
Claim 6
Dependent Claim
50 words
The apparatus of claim 4, and an inner sleeve element slidably and coaxially mounted in said tubular body and being axially movable against said clutch balls to at times uncouple the rod member from the tubular body to allow the rod member to be retracted relative to the driving member.
Claim 7
Dependent Claim
17 words
The apparatus of claim 4, and a bearing block on said support slidably receiving said tubular body.
Claim 8
Dependent Claim
53 words
The apparatus of claim 4, and wherein the end of the elongated block member is provided with a yoke member through which said driving bar member extends, and said stop means includes an adjustable abutment element mounted on said yoke member and being engageable by said driving bar member in its reset movement.
Claim 9
Dependent Claim
24 words
The apparatus of claim 7, and wherein said adjustable abutment element comprises the movable plunger element of a micrometer mounted on said yoke member.
Claim 10
Dependent Claim
31 words
The apparatus of claim 1, and means secured on said elongated block member and engaging said actuating rod member with sufficient frictional force to hold it stationary during said reset movement.
Claim 11
Dependent Claim
38 words
The apparatus of claim 9, and wherein said means engaging the actuating rod member comprises a projection on said elongated block member slidably receiving said rod member and a friction element in said projection engaging said rod member.
Claim 12
Dependent Claim
53 words
The apparatus of claim 10, and wherein said projection is formed with a first bore receiving said rod member and with a second bore perpendicular to said first bore, and wherein said friction element comprises a ball in said second bore and spring means biasing said ball into contact with said rod member.
Claim 13
Dependent Claim
16 words
The apparatus of claim 11, and means to adjust the force exerted by said spring means.
Claim 14
Dependent Claim
31 words
The apparatus of claim 12, and means to retard the reset movement of said reciprocatory driving means sufficiently to maintain the rod member stationary under said force during said reset movement.
Claim 15
Dependent Claim
46 words
The apparatus of claim 13, and wherein said reciprocatory driving means comprises a fluid pressure cylinder having respective ejection and reset fluid pressure inlet conduits connected to its opposite end portions, and wherein said retarding means comprises a restriction in the reset fluid pressure inlet conduit.
Claim 16
Dependent Claim
13 words
The apparatus of claim 14, and wherein said restriction comprises an adjustable valve.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |