US3615240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micropipette comprising a pawl mechanism for driving a rotary member
Assignee: ICN Micromedic Systems Inc
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Filing: 1970-02-24
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Granted: 1971-10-26
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Expires: 1990-02-24
Abstract
Abstract A device for drawing and distribution of liquid, as exemplified in a pipette, operated alternately in two directions, for drawing and distributing liquid, having an enclosure for the liquid storing purposes, comprising a pawl mechanism for driving a rotary member, an armature rotatably mounted around the rotary member, a support on the armature for pivotal movement at right angles to the rotational axis of the armature, first and second pawls secured to opposite sides of the support axis, and capable of being selectively brought into engagement with the teeth of the rotary member by rocking the support in one direction in the case of the first pawl, and in the opposite direction in the case of the second pawl.
Inventors
- 👤 Manuel Claude Sanz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; F; F16; F16H; F16H31/00; F16H31/001
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
41 words
An analytical pipette as in claim 1, wherein there are indicia and indicator means associated with said first and second adjustment means and said means for rotating said cylinder means, whereby the amount of aspiration and discharge can be accurately preset.
Claim 2
Dependent Claim
46 words
An analytical pipette as in claim 1, wherein said cylinder means surrounds said piston means and a portion thereof forms a guide for said piston means, said gear means comprising an external threaded section on said piston means and mating internal threads on said cylinder means.
Claim 3
Dependent Claim
39 words
An analytical pipette as in claim 1, wherein said chamber means comprises a tube secured to the end of said housing and said piston means comprises a body portion and rod extending therefrom, said rod extending into said tubing.
Claim 4
Dependent Claim
76 words
An analytical pipette as in claim 1, wherein the means to rotate said cylinder includes at least one disk mounted to said cylinder and having teeth around its circumference, support means surrounding said piston means, said support means having two pawls, linkage means connecting said means to rotate said cylinder means with said support means and adapted to alternatively engage each of said pawls on said toothed disk to rotate said cylinder means in alternate directions.
Claim 5
Dependent Claim
100 words
An analytical pipette as in claim 5, wherein said linkage means includes an armature surrounding said support means and mounted for rotative movement in said housing, braking means for decelerating said armature during rotation thereof, said support means hinged to said armature means, said pawls being attached to said support means on each side of its hinged axis and adapted to alternately engage said toothed disk upon pivoting of said support means, stop means for limiting the amount of pivot of said support means, and a force applying member connecting said support means with said means to rotate said cylinder.
Claim 6
Dependent Claim
27 words
An analytical pipette as in claim 6, wherein said means to rotate said cylinder comprises a ring surrounding said housing means and mounted for rotary movement thereon.
Claim 7
Dependent Claim
21 words
An analytical pipette as in claim 6, wherein said housing means is cylindrical and said armature is of a cylindrical configuration.
Claim 8
Dependent Claim
36 words
An analytical pipette as in claim 8, wherein said cylindrical armature is square C-shaped in cross section and said support means is circular and is pivoted within a channel formed by the C-shape of said armature.
Claim 9
Dependent Claim
31 words
An analytical pipette as in claim 9, wherein said force applying means is a stem, said stem being connected to said support means at a point diametrically opposite its hinge axis.
Claim 10
Dependent Claim
26 words
An analytical pipette as in claim 10, wherein said braking means consists of at least one resilient member on said housing means abutting said armature means.
Claim 11
Dependent Claim
30 words
An analytical pipette as in claim 6, wherein there is a stop means mounted on said housing to limit the maximum angular displacement of said armature relative to said housing.
Claim 12
Dependent Claim
56 words
An analytical pipette as in claim 12, wherein said stop means consists of a stop member secured to said housing means, an aperture in said armature means, said stop member projecting through said aperture, and two pins mounted in said armature, whereby said stop member engages said pins to limit the angular displacement of said armature.
Claim 13
Dependent Claim
141 words
An analytical pipette as in claim 6, wherein said first and second adjustment means comprise two cams mounted on each side of said armature, each cam having two internal arcuate cam surfaces, said surfaces having a profile formed by concentric arcs, the larger radius arc forming the smaller cam surface, the radii differing by an amount greater than the depth of penetration of either pawl in the teeth of said disk, two pins on said support means parallel to its axis of rotation and extending in opposite directions, each adapted to cooperate with a separate cam, the location of said pins on said support means being such that when both pins are in contact with the smaller radius cam surface of their respective cams, the support means is in a centered or neutral position with neither pawl engaging said toothed disks.
Claim 14
Dependent Claim
90 words
An analytical pipette as in claim 14, wherein each cam has a force-applying member connecting it to an adjustment ring, said adjustment ring being circular and mounted for rotary movement on the external surface of said housing, indicia and indicator means associated with each said adjustment ring so that an accurate setting can be made after predetermining the desired amount of aspiration or discharge or both, one of said adjustment rings adapted to limit the maximum amount of aspiration and the other adapted to limit the maximum amount of discharge.
Claim 15
Dependent Claim
73 words
An analytical pipette as in claim 15, wherein said armature has a square C-shaped cross section, apertures in the top and bottom flanges respectively of said C-shaped armature to allow said pins to extend to said cam surfaces, the size of each aperture being sufficient to allow pivoting of said support means and engagement of said disk and one of said pawls when the rotation of said cylindrical means commences in one direction.
Claim 16
Dependent Claim
20 words
An analytical pipette as in claim 1, including limiting means to limit the maximum axial travel of said piston means.
Claim 17
Dependent Claim
25 words
An analytical pipette as in claim 1, wherein the means to prevent rotary movement of said piston means consists of a stud in slot means.
Claim 18
Dependent Claim
48 words
An analytical pipette as in claim 1, including a frame means, said frame means having clamp means engaging said housing means, a toothed ring gear on said cylinder means, a manually manipulatable means on said frame means including a friction clutch adapted to engage and drive said cylinder.
Claim 19
Dependent Claim
134 words
An adjustment mechanism for an analytical liquid drawing and distributing instrument, said mechanism comprising: a. an axially movable member, and b. a rotatable member, and c. motion-translating means connecting said axially moveable and rotatable members to translate the rotary motion of said rotatable member into axial motion of said movable member, and d. pivot means adapted to rotate said rotatable member, and e. a first pivotable means adapted to adjustably limit the degree of rotation of said rotatable member in a first angular direction, and f. a second pivotable means adapted to adjustably limit the degree of rotation of said rotatable member in a second angular direction, both said pivotable means mechanically connected to said pivot means, whereby the amount of rotation of said rotatable member can be preset for either direction of rotation.
Claim 20
Dependent Claim
38 words
An adjustment mechanism as in claim 20, further including: h. indicia and indicator means associated with said pivot means and each of said pivotable means for accurately presetting the limits of the angular movement of said rotatable member.
Claim 21
Dependent Claim
44 words
An adjustment mechanism as in claim 20, wherein said rotatable member surrounds said axially movable member and is adapted to act as a guide therefor, said motion translating means comprising portions of the rotatable member and the axially movable member having mating engaging threads.
Claim 22
Dependent Claim
119 words
An adjustment mechanism as in claim 20, further including: h. at least one toothed disk connected to said rotatable member, and i. ring means surrounding said disk, and j. a freely rotatable armature surrounding said ring means and having an inwardly opening channel, and k. said ring means pivoted inside of said channel, and l. two pawls on said ring means on the inner circumference thereof, and m. stem means connecting said ring means and said pivot means, and n. stop means limiting the degree of rotation of said armature means to a predetermined maximum whereby said pawls alternately engage said toothed disks to engage said rotatable member upon pivoting of said ring means upon movement of said pivot.
Claim 23
Dependent Claim
43 words
An adjusTment mechanism as in claim 23, wherein said pivotable means have inner cam surfaces adapted to cooperate with a portion of said ring means to limit the degree of rotation of said armature within the maximum rotation allowed by said stop means.
Claim 24
Dependent Claim
52 words
An adjustment mechanism as in claim 20, further including: h. a stop means setting the maximum amount of travel of said rotatable member, and i. cam means associated with both said pivotable means to limit the amount of rotation of said rotatable member within the maximum limits set by the stop member.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |