Patent EA-003403-B1 (EA)
Title: A can opener construction with better easiness in opening and enhanced sanitariness
Inventor: CHO SUNG HO
IPC: B65D17/34
Filed: 1999-11-15
Abstract: 1. A can lid structure, comprising an opening piece formed on a can lid along a depressed seam, and an opening tab exteriorly attached to the can lid and used for breaking the seal of the opening piece along the depressed seam when necessary, said opening tab being locked to the can lid at its fixed end portion using a rivet, said tab also having both an arcuate slit formed around a riveted junction and a hole at a position between the fixed end portion and a free end portion, wherein depressed linear portions are formed on the opening tab at opposite edges around said free end portion so as to allow the free end portion to be easily raised upwardly from the can lid at the depressed linear portions, said depressed linear portions being depressed grooves having a predetermined size and extending in a transverse direction. 2. The can lid structure according to Claim 1, wherein a depression is externally formed on the can lid at a position between the depressed linear portions and the arcuate slit of the opening tab, thus allowing the free end portion of the tab to be more easily raised upwardly at the depressed linear portions when the depressed linear portions are pressed downwardly. 3. The can lid structure according to Claim 1, wherein a thumb pushing part is provided on said tab at a side of the depressed linear portions and allows the depressed linear portions to be more easily operated. 4. The can lid structure according to Claim 1 or 3, wherein a desired advertising or tab opening instructional pattern is provided on the thumb pushing part of said opening tab. 5. A can lid structure, comprising an opening piece formed on a can lid along a depressed seam, and an opening tab exteriorly attached to the can lid and used for breaking the seal of the opening piece along the depressed seam when necessary, said opening tab being locked to the can lid at its fixed end portion using a rivet, said tab also having an arcuate slit formed around a riveted junction, with a thumb-operable resilient bulge being provided on the tab at a position between the fixed end portion and a free end portion so as to allow the free end portion of the tab to be easily raised upwardly from the can lid, wherein a plurality of regularly spaced and appropriately sized grooves in the form of a concentric circular profile are formed on a lower surface of said thumb-operable resilient bulge, thus allowing the bulge to be smoothly operated. 6. The can lid structure according to Claim 5, wherein a cut reinforcing part is formed on said thumb-operable resilient bulge of the opening tab so as to allow the resilient bulge to be more smoothly operated. 7. The can lid structure according to Claim 5 or 6, wherein depressed linear portions are formed on the opening tab at opposite edges around said free end portion so as to allow the free end portion to be more easily raised upwardly from the can lid at the depressed linear portions, said depressed linear portions being depressed grooves having a predetermined size and extending in a transverse direction. 8. The can lid structure according to Claim 1 or 7, wherein two or more depressed linear portions are formed on the opening tab at each edge around said free end portion so as to allow the free end portion of the opening tab to be more easily raised upwardly from the can lid at the depressed linear portions. 9. The can lid structure according to Claim 5 or 6, wherein a plurality of regularly spaced and regularly sized grooves in the form of a linear profile or a comb structural profile are formed on the lower surface of said thumb-operable resilient bulge, thus allowing the bulge to be smoothly operated. 10. The can lid structure according to Claim 7, wherein a depression is externally formed on the can lid at a position between depressed linear portions, transversely formed on the opening tab at opposite edges around the free end portion, and the arcuate slit of the opening tab, thus allowing the free end portion of the tab to be more easily raised upwardly at the depressed linear portions when the depressed linear portions are pressed downwardly. 11. The can lid structure according to Claim 9, wherein a plurality of regularly spaced, regularly sized and regularly shaped grooves are formed on an upper surface of said thumb-operable resilient bulge, thus allowing the bulge to be smoothly operated. 12. The can lid structure according to Claim 5 or 6, wherein a desired advertising or tab opening instructional pattern is provided on the thumb pushing part of said opening tab. 13. A can lid structure, comprising an opening piece formed on a can lid along a depressed seam, and an opening tab exteriorly attached to the can lid and used for normally covering the opening piece and selectively breaking the seal of the opening piece along the depressed seam when necessary, said opening tab being locked to the can lid at its fixed end portion using a rivet, said tab also having an arcuate cutting line at a middle portion, with two depressed lines transversely extending from both ends of said arcuate cutting line to opposite edges of the tab, a thumb-operable resilient bulge being provided on the tab at a position between the depressed lines and a free end portion of the tab so as to allow the free end portion of the tab to be easily raised upwardly from the can lid, and a levering projection being formed by the arcuate cutting line and pressing the opening piece of the can lid downwardly when the tab is bent at the depressed lines, thus breaking the seal of the opening piece along the depressed seam, wherein a plurality of regularly spaced and appropriately sized grooves in the form of a concentric circular profile, a linear profile or a comb structural profile are formed on an upper or lower surface of said thumb-operable resilient bulge, thus allowing the bulge to be smoothly operated. 14. The can lid structure according to Claim 13, wherein a cut reinforcing part is formed on said thumb-operable resilient bulge of the opening tab so as to allow the resilient bulge to be more smoothly operated. 15. The can lid structure according to Claim 13 or 14, wherein one or more depressed linear portions are formed on the opening tab at each edge around said free end portion so as to allow the free end portion to be more easily raised upwardly from the can lid at the depressed linear portions, said depressed linear portions being depressed grooves having a predetermined size and extending in a transverse direction. 16. The can lid structure according to Claim 13 or 14, wherein a desired advertising or tab opening instructional pattern is provided on the thumb pushing part of said opening tab.