Claims
- 1. A system for securing a lid to a container pan wherein the lid has a peripheral marginal surface the outer marginal edge of which is formed into a depending lip, and wherein the pan has an upstanding wall the upper edge of which forms an outwardly directed flange which lies in a plane substantially perpendicular to said upstanding wall, said lid being disposed on said pan with said marginal surface overlying said flange and with said depending lip disposed outwardly of and extending below the plane of said flange, said system comprising, first die means including a die fixture adapted to receive and support said pan and complementary lid, said first die means further including seam forming plate means supported peripherally of said pan and lid and movable in a plane substantially perpendicular to said depending lip on said lid, and means operatively associated with said forming plate means to effect movement thereof so as to engage said depending lip and form it into underlying juxtaposed relation to said flange, and second die means including a lower die set adapted to receive and support said pan and rim after forming said lip into said underlying juxtaposed relation to said flange, said second die means including final seam forming supported for movement in a first direction substantially perpendicular to said outwardly directed flange and for subsequent movement in a second direction substantially perpendicular to said upstanding wall of said pan, and means for effecting said movements of said seam forming die means to, firstly, form said flange and juxtaposed lip against said upstanding wall, and, secondly, press the juxtaposed thicknesses of said flange, marginal surface of said lid, and said lip against said upstanding wall to complete said double seam.
- 2. A system as defined in claim 1 wherein said pan and associated lid include substantially straight side edges and rounded corner edges, and wherein said seam forming plates include side seam forming plates juxtaposed to said side edges of said pan when supported on said pan support means, and corner seam forming plates juxtaposed to said rounded corner edges.
- 3. The system of claim 1 wherein said first die means includes pan support means having a lift plate adapted to receive said pan thereon, and pilot plate means adapted to engage the outer surface of said lid and position said pan against said lift plate.
- 4. The system of claim 3 wherein said lift plate means includes means biasing said lift plate toward said pilot plate so as to place a lid and pan interposed therebetween in a state of compression.
- 5. The system as defined in claim 1 wherein said second die means includes pan support means adapted to support a pan and associated lid after said depending lip on said lid is formed into juxtaposed underlying relation with said flange, said final seam forming die means including a plurality of seam forming dies extending peripherally of a pan and associated lid when supported on said pan support means, said seam forming dies being movable in said direction substantially normal to said flange to engage said flange and underlying juxtaposed lip and effect said forming thereof to positions wherein said underlying lip lies against said upstanding wall of said pan, said seam forming dies being further movable in said direction substantially normal to said upstanding wall of said pan to press said juxtaposed thicknesses against said upstanding wall to complete said double seam.
- 6. The system as defined in claim 5 including cam block means supported by said pan support means of said second die means for cooperation with said seam forming dies to effect movement thereof in said second direction after said forming die means is moved in said first direction a predetermined distance.
- 7. The system as defined in claim 6 wherein said second die means includes pilot plate means adapted to engage said lid when its associated pan is disposed on said pan support means, said pilot plate means serving to position said lid and pan against said pan support means.
- 8. The system as defined in claim 1 wherein said first die means includes means for compressing the bottom of said pan and said lid toward each other to remove air from said pan during forming of said depending lip into underlying juxtaposed relation to said flange.
Parent Case Info
This is a division, of application Ser. No. 707,754, filed July 22, 1976 now U.S. Pat. No. 4,088,086.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
707754 |
Jul 1976 |
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