Claims
- 1. A sealing bar for heat sealing a length of heat-sealable material, such as tubing, to form packages and the like, said bar having a metal surface adapted for pressure engagement with the heat-sealable material for flattening it and heating it, said bar having a slot extending substantially therethrough adjacent said surface, said slot being arranged to define the portion of the bar between the slot and said surface as a relatively thin resiliently flexible metal bridge which is engageable with a portion of the heat-sealable material, such as a portion of tubing having a longitudinal seam or a gusset, thicker than other portions of the flattened material, and adapted resiliently to yield on engagement with said thicker portion of the material.
- 2. A sealing bar as set forth in claim 1 wherein the slot is generally V-shaped.
- 3. A sealing bar as set forth in claim 2 wherein the V-shaped slot has an apex and two diverging slot portions angling inwardly away from said surface of the bar.
- 4. A sealing bar as set forth in claim 3 wherein said bridge has a transverse split therein forming two cantilever bridge sections adapted resiliently to yield on engagement with said thicker portions of the heat-sealable material.
- 5. A sealing bar as set forth in claim 4 wherein the bridge sections define a gap therebetween extending inwardly from said surface to the apex of the slot.
- 6. A sealing bar as set forth in claim 5 further comprising a cylindric bore through the bar at the apex of the slot and in the direction of the depth of the slot.
Parent Case Info
This is a continuation-in-part of application Ser. No. 887,559, filed July 17, 1986 and now U.S. Pat. No. 4,693,058, issued Sept. 15, 1987.
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2255762 |
May 1973 |
DEX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
887559 |
Jul 1986 |
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