Sheet metal container making – Apparatus to form container closure – Having means forming frangible zone on closure
Reexamination Certificate
2000-02-07
2003-09-09
Gerrity, Stephen F. (Department: 3721)
Sheet metal container making
Apparatus to form container closure
Having means forming frangible zone on closure
C072S117000
Reexamination Certificate
active
06616393
ABSTRACT:
The present invention relates to a link coupling used in a reformer for beverage or other container bottoms and, in particular, to a link coupling using a stepped pin.
BACKGROUND INFORMATION
In certain metal container fabrication processes, including those used for producing aluminum beverage containers, strength, durability and/or resistance to damage of the container can be enhanced by providing predetermined shapes or profiles of the can bottom portion. Certain shaping procedures involve use of a reforming apparatus which employs a pivoting rigid link for positioning and/or controlling motion of a reforming roller. In previous approaches, a substantially cylindrical pin is used for coupling the rigid link to other components of the reformer. The pivot connection(s) between the link and other components is susceptible to wear. The rapidity with which wear occurs accordingly affects the frequency at which the pins and/or associated bushings and the like, must be replaced. Replacement of these parts typically requires shutting down a production line with disadvantageous economic consequences. In some cases maintenance is performed substantially off line, often including replacing the rams. Accordingly, it would be useful to provide a configuration and method for reforming which can reduce wear on the reformer link assembly (or components thereof) and/or otherwise reduce the frequency at which production lines must be shut down for reformer maintenance or repair.
Furthermore, as reformer components wear, there may be deterioration in the precision with which the roller is positioned and thus departure of the container bottom shape from the intended shape or position. Such departures can reduce the container's strength, durability or resistance to damage. Accordingly, it would be useful to provide a reformer configuration and method which can reduce and/or delay wear-induced departures of container bottom shapes from intended shapes.
Once it is determined that a reformer should be repaired or maintained, the magnitude of the economic disadvantage flowing from the shut-down of a production line is related to the amount of time required to perform the repair or maintenance. Accordingly, it would be useful to provide an apparatus and method in which repair or maintenance of a reformer, and particularly of pins and/or bushings used in a reformer link assembly, can be performed relatively rapidly (e.g. compared with previous apparatus and methods) preferably in a substantially standardized fashion.
SUMMARY OF THE INVENTION
The present invention includes a recognition of the existence, nature and/or source of certain problems of previous approaches and devices, including as described herein. According to one aspect, the present invention involves the use of a link pin which has a stepped, rather than a cylindrical, profile. Preferably, the stepped pin is used in conjunction with a flanged bushing. Without wishing to be bound by any theory, it is believed that increased lifetimes and reduced wear achieved using embodiments of the present invention are at least partially attributable to the reduction or elimination of axial gaps or spacings which commonly occurred between components in previous configurations or approaches.
In at least some embodiments, increases in lifetimes and/or reductions in frequency of maintenance or repair involves the use of high-wear-resistant bushings for contacting the link pins, including ceramic bushings.
In one aspect, movement of rollers used for reforming an inner wall of a metal container bottom such as an aluminum beverage container is controlled at least partially using a rigid link coupled to other components of a reformer apparatus by a pin having a stepped profile. The stepped-profile pin preferably defines first and second shoulder regions. Undesired spaces or gaps in the pin-axial or thrust direction are reduced or eliminated by closely-positioning bushing flanges or thrust washers adjacent the shoulders.
REFERENCES:
patent: 744672 (1903-11-01), Baeumle
patent: 854426 (1907-05-01), Lowry
patent: 894842 (1908-08-01), Lowry
patent: 994468 (1911-06-01), Kane
patent: 1031264 (1912-07-01), Hinde et al.
patent: 1441674 (1923-01-01), Foster et al.
patent: 1461729 (1923-07-01), Foster et al.
patent: 1524106 (1925-01-01), Riegel
patent: 1524946 (1925-02-01), Nystrom
patent: 2158312 (1939-05-01), Terrel
patent: 2612204 (1952-09-01), Rickhoff
patent: 2618182 (1952-11-01), Teetor
patent: 2624303 (1953-01-01), Ghormley
patent: 2654413 (1953-10-01), Weidel
patent: 2737996 (1956-03-01), Toth
patent: 2893463 (1959-07-01), Kowal
patent: 2943667 (1960-07-01), Ewing et al.
patent: 3382699 (1968-05-01), Seeman
patent: 3417898 (1968-12-01), Bozek et al.
patent: 3559258 (1971-02-01), Gardner
patent: 3653243 (1972-04-01), Ramseier
patent: 3687098 (1972-08-01), Maytag
patent: 3693828 (1972-09-01), Kneusel et al.
patent: 3696657 (1972-10-01), Maytag
patent: 3759142 (1973-09-01), Maytag
patent: 3808868 (1974-05-01), Wolfe
patent: 3831416 (1974-08-01), Wolfe
patent: 3898828 (1975-08-01), Cassai et al.
patent: 3904069 (1975-09-01), Toukmanian
patent: 3905507 (1975-09-01), Lyu
patent: 3942673 (1976-03-01), Lyu et al.
patent: 3951083 (1976-04-01), Hörtig
patent: 3964413 (1976-06-01), Saunders
patent: 4070888 (1978-01-01), Gombas
patent: 4108324 (1978-08-01), Krishnakumar et al.
patent: 4120419 (1978-10-01), Saunders
patent: 4134354 (1979-01-01), Cvacho et al.
patent: 4147271 (1979-04-01), Yamaguchi
patent: 4151927 (1979-05-01), Cvacho et al.
patent: 4199073 (1980-04-01), Gombas
patent: 4280353 (1981-07-01), Murphy
patent: 4289014 (1981-09-01), Maeder et al.
patent: 4294097 (1981-10-01), Gombas
patent: 4294373 (1981-10-01), Miller et al.
patent: 4307593 (1981-12-01), Riggs
patent: 4341321 (1982-07-01), Gombas
patent: 4372143 (1983-02-01), Elert et al.
patent: 4381061 (1983-04-01), Cerny et al.
patent: 4399679 (1983-08-01), King
patent: 4402419 (1983-09-01), MacPherson
patent: 4412627 (1983-11-01), Houghton et al.
patent: 4419319 (1983-12-01), Reynolds, Jr. et al.
patent: 4446714 (1984-05-01), Cvacho
patent: 4454742 (1984-06-01), Gombas
patent: 4470281 (1984-09-01), Kaporovich et al.
patent: 4515284 (1985-05-01), Lee, Jr. et al.
patent: 4519232 (1985-05-01), Traczyk et al.
patent: 4598831 (1986-07-01), Nakamura et al.
patent: 4599123 (1986-07-01), Christensson
patent: 4620434 (1986-11-01), Pulciano et al.
patent: 4650628 (1987-03-01), Evely
patent: 4685582 (1987-08-01), Pulciani et al.
patent: 4693108 (1987-09-01), Traczyk et al.
patent: 4717523 (1988-01-01), Evely
patent: 4723430 (1988-02-01), Hahn
patent: 4732027 (1988-03-01), Traczyk et al.
patent: 4732292 (1988-03-01), Supik
patent: 4768672 (1988-09-01), Pulciani et al.
patent: 4774839 (1988-10-01), Caleffi et al.
patent: 4834256 (1989-05-01), McMillin
patent: 4885924 (1989-12-01), Claydon et al.
patent: 4915511 (1990-04-01), Kotegawa et al.
patent: 4919294 (1990-04-01), Kawamoto et al.
patent: 4953738 (1990-09-01), Stirbis
patent: 5040682 (1991-08-01), Palisin, Jr. et al.
patent: 5090226 (1992-02-01), Takeoka et al.
patent: 5105973 (1992-04-01), Jentzsch et al.
patent: 5111679 (1992-05-01), Kobayashi et al.
patent: 5154669 (1992-10-01), Weiss et al.
patent: 5222385 (1993-06-01), Halasz et al.
patent: 5325696 (1994-07-01), Jentzsch et al.
patent: 5355709 (1994-10-01), Bauder et al.
patent: 5433098 (1995-07-01), Bowlin et al.
patent: 5467628 (1995-11-01), Bowlin et al.
patent: 5661904 (1997-09-01), Loughlin
patent: 5704241 (1998-01-01), Babbitt et al.
patent: 5706686 (1998-01-01), Babbit et al.
patent: B-85992/91 (1994-09-01), None
patent: 0 482 581 (1991-10-01), None
Ball Corporation
Gerrity Stephen F.
Huynh Louis
Sheridan & Ross P.C.
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