US3786683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand-operated pipette
Assignee: Alphamedics Manufacturing Corp
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Filing: 1972-09-12
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Granted: 1974-01-22
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Expires: 1992-09-12
Abstract
Abstract A hand-operated portable pipette is disclosed which includes a housing, a flexible tube mounted therein along a path. The tube has a first end thereof mounted for movement with respect to the housing. A trigger is also mounted on the housing to operate a roller for occluding the tube along a portion of the path in response to movement of the trigger. The trigger is biased to a rest position. A multifaced cam is mounted as an adjustable stop for determining the nominal maximum travel of the trigger. A spring loaded over-travel stop is mounted in the trigger to interact with the multifaced cam so that a first force applied to the trigger will cause the spring loaded over-travel stop to rest against the face of the multifaced cam bringing the trigger to rest at a first position. If additional force is applied to the trigger, the spring loaded over-travel stop depresses into the trigger extending the movement of the trigger to allow the tube to be occuluded further along the path. A disposable tip is inserted in a movable end of the tube to allow changing thereof. A second trigger, arm, and sleeve are used to eject the disposable tip after usage.
Inventors
- 👤 R Berman
- 👤 B Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:07
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/0275; B01L3/0279; B01L3/021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
208 words
A hand-operated pipette including: a housing; a flexible tube mounted in said housing to define a path; a trigger mounted on said housing for movement between the first and second position, said second position being defined by a spring loaded stop member carried by said trigger which inhibits movement of said trigger beyond said second position in response to a force below a predetermined level and allows movement of said trigger beyond said second position to a third position in response to a force applied thereto which is greater than said predetermined level; and depressing means mounted in said housing for creating an occlusion in said flexible tube on said path; said depressing means being arranged to create said occlusion at a first point; said depressing means being responsive to said trigger moving from said first to said second position for moving the occlusion along said path from said first point to a second point; said second point being displaced a predetermined distance along said path from said first point; said depressing means being responsive to said trigger moving to said third position for moving said collusion to a third point on said path which is a greater distance from said first point than said second point is.
Claim 2
Dependent Claim
208 words
A hand-operated pipette including: a housing; a flexible tube mounted in said housing to define a path; a trigger mounted on said housing for movement between the first and second position, said second position being defined by a spring loaded stop member carried by said trigger which inhibits movement of said trigger beyond said second position in response to a force below a predetermined level and allows movement of said trigger beyond said second position to a third position in response to a force applied thereto which is greater than said predetermined level; and depressing means mounted in said housing for creating an occlusion in said flexible tube on said path; said depressing means being arranged to create said occlusion at a first point; said depressing means being responsive to said trigger moving from said first to said second position for moving the occlusion along said path from said first point to a second point; said second point being displaced a predetermined distance along said path from said first point; said depressing means being responsive to said trigger moving to said third position for moving said collusion to a third point on said path which is a greater distance from said first point than said second point is.
Claim 3
Dependent Claim
44 words
The hand-operated pipette as defined in claim 1 also including: a stator mounted in said housing; and said flexible tube has a tab formed thereon; said tab mating with said stator to mount said flexible tube in said housing and to define said path.
Claim 4
Dependent Claim
31 words
The hand-operated pipette as defined in claim 1 also including: a disposable tip; means for securing said disposable tip to said flexible tube; and tip ejection means mounted on said housing.
Claim 5
Dependent Claim
44 words
The hand-operated pipette as defined in claim 1 also including; a stator mounted in said housing; and said flexible tube has a tab formed thereon; said tab mating with said stator to mount said flexible tube in said housing and to define said path.
Claim 6
Dependent Claim
137 words
A hand-operated pipette including: a housing; a flexible tube mounted in said housing to define a path; a trigger mounted on said housing for movement between a first and second position; depressing means mounted in said housing for creating an occlusion in said flexible tube on said path; said depressing means being arranged to create said occlusion at a first point; said depressing means being responsive to said trigger moving from said first to said second position for moving the occlusion along said flexible tube from said first point to a second point; said second point being displaced a predetermined distance along said path from said first point; and second position defining means for defining said second position; said second position defining means including adjustable means for allowing the maximum travel of said trigger to be adjusted.
Claim 7
Dependent Claim
137 words
A hand-operated pipette including: a housing; a flexible tube mounted in said housing to define a path; a trigger mounted on said housing for movement between a first and second position; depressing means mounted in said housing for creating an occlusion in said flexible tube on said path; said depressing means being arranged to create said occlusion at a first point; said depressing means being responsive to said trigger moving from said first to said second position for moving the occlusion along said flexible tube from said first point to a second point; said second point being displaced a predetermined distance along said path from said first point; and second position defining means for defining said second position; said second position defining means including adjustable means for allowing the maximum travel of said trigger to be adjusted.
Claim 8
Dependent Claim
21 words
The hand-operated pipette as defined in claim 5 in which said trigger is biased to normally rest in said first position.
Claim 9
Dependent Claim
55 words
The hand-operated pipette as defined in claim 6 in which said adjustable means includes: a multifaced cam mounted for movement in said housing to provide an adjustable stop for said trigger. 8 . The hand-operated pipette as defined in claim 7 in which said depressing means includes: a roller mounted for movement along said path.
Claim 10
Dependent Claim
34 words
The hand-operated pipette as defined in claim 5 also including: a disposable tipe; means for securing said disposable tip to said first end of said tube; and a tip ejector mounted on said housing.
Claim 11
Dependent Claim
55 words
The pipette as defined in claim 9 in which said trigger is brought to said first position and is responsive to a first force level applied thereto to move from said first position to said second position and to a second force level applied thereto to move from said second position to a third position.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |