US3667651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for deriving limited reciprocating motion from rotational motion
Assignee: Individual
•
Filing: 1970-12-11
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Granted: 1972-06-06
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Expires: 1990-12-11
Abstract
Abstract A device for deriving limited reciprocating motion from a bidirectional electric motor. The device is employed, for example, to reciprocate the plunger of a liquid dispensing pipet to dispense a measured amount of liquid with each reciprocation. The motor drives the plunger upwardly, drawing liquid reagent into the pipet, until an adjustable stop carried by the plunger engages the top flange of the pipet barrel. This causes the motor to reverse and move the plunger downwardly to its bottom limiting position, discharging the measured amount of reagent into a collection receptacle.
Inventors
- 👤 Justin J Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:52
CPC Classifications
G; G05; G05G; G05G15/00; G05G15/04; G05G5/00; G05G5/04; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18088; Y10T74/1812
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
70 words
In combination, an apparatus having a linearly reciprocatory operating member, stop means limiting translation of said operating member between opposite limits of travel, a bi-directional motor of a type having means to automatically reverse it responsive to encountering an obstacle, and means drivingly coupling said motor to said operating member, and wherein said apparatus comprises a pipet having a barrel and said operating member comprises a plunger in said barrel.
Claim 2
Dependent Claim
70 words
In combination, an apparatus having a linearly reciprocatory operating member, stop means limiting translation of said operating member between opposite limits of travel, a bi-directional motor of a type having means to automatically reverse it responsive to encountering an obstacle, and means drivingly coupling said motor to said operating member, and wherein said apparatus comprises a pipet having a barrel and said operating member comprises a plunger in said barrel.
Claim 3
Dependent Claim
22 words
The structural combination of claim 1, and means to adjust said stop means to vary the travel stroke of said operating member.
Claim 4
Dependent Claim
37 words
The structural combination of claim 1, and wherein said motor is provided with an energizing circuit including a limit switch, and means operating said limit switch at an end of the travel stroke of said operating member.
Claim 5
Dependent Claim
15 words
The structural combination of claim 3, and control switch means connected across said limit switch.
Claim 6
Dependent Claim
40 words
The structural combination of claim 1, and wherein the means drivingly coupling the motor to said operating member comprises rack bar means on the operating member and pinion gear means on the motor meshingly engaged with said rack bar means.
Claim 7
Dependent Claim
58 words
The structural combination of claim 1, and wherein said stop means includes a disc member at the top end of said plunger engageable with the top end of said barrel, said barrel top end being formed with a flange, said disc member having depending rod means, and an abutment element on said rod means engageable with said flange.
Claim 8
Dependent Claim
21 words
The structural combination of claim 6, and means to adjust the position of said abutment element on said depending rod means.
Claim 9
Dependent Claim
51 words
The structural combination of claim 1, and wherein said means drivingly coupling said motor to said operating member comprises rack bar means rigidly connected to said plunger, said motor being mounted substantially rigidly relative to said barrel, and drive pinion gear means on the motor meshing with said rack bar means.
Claim 10
Dependent Claim
44 words
The structural combination of claim 8, and wherein said motor is provided with an energizing circuit including a limit switch, said rack bar means being provided with means operatively engageable with said limit switch at the end of the discharge stroke of said plunger.
Claim 11
Dependent Claim
17 words
The structural combination of claim 9, and control switch means connected in parallel with said limit switch.
Claim 12
Dependent Claim
28 words
The structural combination of claim 8, and wherein said drive pinion gear means comprises a pinion gear mounted on and resiliently connected to the shaft of the motor.
Claim 13
Dependent Claim
44 words
The structural combination of claim 8, and wherein the motor is provided with an upstanding supporting member secured to the barrel, and flanged guide roller means journalled to said supporting member and supportingly engaging said rack bar means opposite said drive pinion gear means.
Claim 14
Dependent Claim
51 words
The structural combination of claim 12, and wherein said drive pinion gear means comprises a pinion gear journalled on the shaft of the motor and an arcuate coupling spring connecting said pinion gear to said motor shaft, whereby to provide a resilient driving connection between the motor and the pinion gear.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |