US4330280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ejector holder for capsule-like cartridge
Assignee: Dentsply Research and Development Corp
•
Filing: 1981-04-09
•
Granted: 1982-05-18
•
Expires: 2001-04-09
Abstract
Abstract A manually operable ejector holder for a loaded capsule-like cartridge of cylindrical shape open at one end and provided with an annular flange at the open end, the other end being closed but provided with an angular discharge nipple and the holder having a cylindrical body provided with an ejecting plunger operated by a pivoted lever-type handle member. The forward end of the cylindrical body being partially cutaway in a radial direction for a limited distance longitudinally to provide a hollow seat to receive the flanged end of the cartridge and the seat having an undercut groove to receive the flange of said cartridge, and the sidewalls of the seat at the upper edges being of limited flexibility and spaced apart a slightly less distance than the diameter of the cartridge body to effect a limited snap-acting connection of the cartridge to the holder.
Inventors
- 👤 Emery W. Dougherty
- 👤 Richard E. Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:21
CPC Classifications
A; A61; A61C; A61C9/00; A61C9/0026; A61C5/00; A61C5/60; A61C5/62; A61C5/66; A61M; A61M3/00; B; B05; B05C; B05C17/00; B05C17/005; B05C17/00596; A61C2201/00; A61C2201/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
171 words
A manually operable ejector holder and a loaded capsule-like cartridge in which said cartridge has an annular collar on one end and a discharge tip on the other, and said holder comprising in combination, an elongated barrel, a plunger reciprocable therein and one end projecting beyond said barrel, manually operable lever means on one end of said barrel operable to reciprocate said plunger relative to the other end of said barrel, and said other end of the barrel being cutaway longitudinally a limited distance to provide a compartment having sidewalls extending a limited distance beyond the axis of said barrel, an undercut groove formed in said compartment within said sidewalls to receive the annular collar on said cartridge to prevent relative axial movement between said cartridge and compartment, and the outer longitudinally-extending portions of the sidewalls of said compartment having limited flexibility and extending toward each other a slightly lesser distance than the diameter of said cartridge to effect a snap-acting retaining means for said cartridge when inserted into said compartment.
Claim 2
Dependent Claim
171 words
A manually operable ejector holder and a loaded capsule-like cartridge in which said cartridge has an annular collar on one end and a discharge tip on the other, and said holder comprising in combination, an elongated barrel, a plunger reciprocable therein and one end projecting beyond said barrel, manually operable lever means on one end of said barrel operable to reciprocate said plunger relative to the other end of said barrel, and said other end of the barrel being cutaway longitudinally a limited distance to provide a compartment having sidewalls extending a limited distance beyond the axis of said barrel, an undercut groove formed in said compartment within said sidewalls to receive the annular collar on said cartridge to prevent relative axial movement between said cartridge and compartment, and the outer longitudinally-extending portions of the sidewalls of said compartment having limited flexibility and extending toward each other a slightly lesser distance than the diameter of said cartridge to effect a snap-acting retaining means for said cartridge when inserted into said compartment.
Claim 3
Dependent Claim
115 words
The ejector holder according to claim 1 in which the sidewalls of said compartment at the inner end thereof are recessed laterally a greater distance than the diameter of the annular flange on said cartridge to permit said flange to be inserted into said compartment incident to being positioned into said undercut groove, and said undercut groove at the upper ends thereof having opposite wall portions of said compartment extending toward each other a limited distance less than the diameter of said annular cartridge flange to provide a seat for said flange forward of the portion of said laterally recessed portion of said sidewalls of said compartment from which said flange cannot be removed laterally.
Claim 4
Dependent Claim
95 words
The ejector holder according to claim 1 in which the sidewalls of said compartment forwardly of said undercut groove extend outwardly in a radial direction from a semi-cylindrical innermost surface of uniform diameter and the distance between said sidewalls being uniform throughout the length thereof forwardly of said undercut groove, and the body of said cartridge having a uniform diameter except for said flange at one end and the opposite end having a discharge nipple extending therefrom, the flange end of said cartridge being open for filling purposes and to receive a piston or plunger.
Claim 5
Dependent Claim
64 words
The ejector holder according to claim 3 in which the inner end of the interior of said cartridge is hemispherical, and a piston for said cartridge having cylindrical sidewalls and the inner end being of a hemispherical shape complementary to the inner end of the interior of said cartridge, the outer end of said piston being engageable by the outer end of said plunger.
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) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |