US4144885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the detachable connection of a piston with a piston plunger
Assignee: Rheinmetall Air Defence AG
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Filing: 1977-08-01
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Granted: 1979-03-20
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Expires: 1997-08-01
Abstract
Abstract An apparatus for the detachable connection of an axially to-and-fro movable piston of a syringe with a piston rod or plunger, comprising at least two holder brackets arranged in mutually spaced relationship from one another at the piston plunger and formed of a spring wire, detachably secured with said piston plunger. Each holder bracket essentially comprises two respective axially extending webs and a connection element or piece arranged transversely with respect to said webs. The piston of the syringe possesses a headpiece formed as a substantially truncated cone and equipped with a contact edge engaged by said connection pieces.
Inventors
- 👤 Donald P. Stait
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:50
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31511; A61M5/31515
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
An apparatus for the detachable connection of an axial to-and-fro movable piston of a syringe with a piston plunger, comprising: at least two holder brackets arranged in spaced relationship from one another and detachably secured with the piston plunger; each of said holder brackets being formed of a spring wire; each of said holder brackets comprising two respective essentially axially extending webs and a connection element arranged transversely with respect to said webs; a headpiece constructed in the form of a substantially truncated conical member provided for the piston of the syringe; and said headpiece having a contact edge with which engage said connection elements.
Claim 2
Independent Claim
105 words
An apparatus for the detachable connection of an axial to-and-fro movable piston of a syringe with a piston plunger, comprising: at least two holder brackets arranged in spaced relationship from one another and detachably secured with the piston plunger; each of said holder brackets being formed of a spring wire; each of said holder brackets comprising two respective essentially axially extending webs and a connection element arranged transversely with respect to said webs; a headpiece constructed in the form of a substantially truncated conical member provided for the piston of the syringe; and said headpiece having a contact edge with which engage said connection elements.
Claim 3
Dependent Claim
25 words
The apparatus as defined in claim 1, further including: a clamping element for securing the holder brackets with an end face of the piston plunger.
Claim 4
Dependent Claim
32 words
The apparatus as defined in claim 1, wherein: a respective bent-off portion is provided at the webs of the holder brackets and merging therewith end portions extending substantially parallel to said webs.
Claim 5
Dependent Claim
40 words
The apparatus as defined in claim 2, wherein: said clamping element has a rear face provided with two spaced bores for the reception of the end portions and grooves for the reception of the bent-off portions of the holder bracket.
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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |