Method of making pop-in container closure

Claim 1

The method of making a manually disruptable pop-in type of button closure for a planar metal container lid comprising: a. depressing the lid in a generally closed, continuous path to provide an integral button portion having inner and outer bounding walls respectively including opposed parallel surfaces inclined to the plane of the lid, b. shear-coining one of the bounding walls to form a lengthwise indentation in one of said inclined surfaces thereof and concommitantly produce a fractured but integral section extending between the other of said surfaces and the bottom of the indentation for a portion of its length, and then c. swedging the indented bounding wall to dilate a face of the indentation at least partly outwardly relative to said fractured section and thereby effectively lock the closure to the container lid.

Claim 2

The method of making a manually disruptable pop-in type of button closure for a planar metal container lid comprising: a. depressing the lid in a generally closed, continuous path to provide an integral button portion having inner and outer bounding walls respectively including opposed parallel surfaces inclined to the plane of the lid, b. shear-coining one of the bounding walls to form a lengthwise indentation in one of said inclined surfaces thereof and concommitantly produce a fractured but integral section extending between the other of said surfaces and the bottom of the indentation for a portion of its length, and then c. swedging the indented bounding wall to dilate a face of the indentation at least partly outwardly relative to said fractured section and thereby effectively lock the closure to the container lid.

Claim 5

The method of making a manually disruptable pop-in type of button closure for a sheet metal container lid comprising: a. depressing a portion of the lid with a tool having a rounded ridge to form transversely convex inner and outer bounding walls at least partly defining a button portion lying substantially in the plane of the lid, b. while the remainer of the lid is unrestrained, shear-coining the outer wall lengthwise with varying penetration in its transversely convex portion over a complemental back-up die to produce a fractured but integral section in an inner portion of the outer wall, and after irregular conjoint edges of the fractured section have substantially sprung together to dissipate tension incurred during metal flow of the shear-coining, c. swedging the locality of convergence of said walls against said die to dilate the outer wall and thus urge the metal on both sides of the fracture into closed association.

Claim 6

The method of making a manually disruptable pop-in type of button closure for a sheet metal container lid comprising: a. depressing a portion of the lid with a tool having a rounded ridge to form transversely convex inner and outer bounding walls at least partly defining a button portion lying substantially in the plane of the lid, b. while the remainer of the lid is unrestrained, shear-coining the outer wall lengthwise with varying penetration in its transversely convex portion over a complemental back-up die to produce a fractured but integral section in an inner portion of the outer wall, and after irregular conjoint edges of the fractured section have substantially sprung together to dissipate tension incurred during metal flow of the shear-coining, c. swedging the locality of convergence of said walls against said die to dilate the outer wall and thus urge the metal on both sides of the fracture into closed association.

Claim 9

The method of making a manually disruptable pop-in type of button closure for a container lid comprising: a. forming a continuous depression and consequent ridge in the lid largely to define the closure and the shape of its outer sectionally convex boundary wall, b. longitudinally shear-coining said wall in its sectionally convex portion with a tool having a cutting edge, an adjacent coining face disposed substantially at 90* to said edge and having uniform width a fraction of the thickness of the lid, and an angularly related coining face concommitantly to open an indentation and provide a fractured but integral section extending from the indentation, and c. partly reclosing said indentation and the material of said fracture by a compressive swedging blow striking against said ridge and/or the wall material adjacent thereto thereby rupturably securing the closure to the lid.

Claim 10

The method of making a manually disruptable pop-in type of button closure for a container lid comprising: a. forming a continuous depression and consequent ridge in the lid largely to define the closure and the shape of its outer sectionally convex boundary wall, b. longitudinally shear-coining said wall in its sectionally convex portion with a tool having a cutting edge, an adjacent coining face disposed substantially at 90* to said edge and having uniform width a fraction of the thickness of the lid, and an angularly related coining face concommitantly to open an indentation and provide a fractured but integral section extending from the indentation, and c. partly reclosing said indentation and the material of said fracture by a compressive swedging blow striking against said ridge and/or the wall material adjacent thereto thereby rupturably securing the closure to the lid.

Claim 11

The method of making a manually distruptable pop-in type of button closure in a sheet metal container lid compRising: a. forming a depression in the lid having continuous inner and outer bounding walls convergent in a ridge, b. while a convex back-up die surface engages the lid on one side thereof at the surface of said lid depression and along at least a portion of said outer wall, indenting the latter lengthwise with a die having an angularly related cutting edge and coining face to provide a fractured but integral section in the outer wall along at least a portion of its length, the width of the face being a fraction of the lid thickness and said integral section being cold worked by the momentary partial separation induced by the coining face, and c. then swedging said ridge against said back-up die surface partly to close said indentation and force the mating metal of the fractured but integral section to flow into closer substantially sealed association.

Claim 12

The method of making a manually distruptable pop-in type of button closure in a sheet metal container lid compRising: a. forming a depression in the lid having continuous inner and outer bounding walls convergent in a ridge, b. while a convex back-up die surface engages the lid on one side thereof at the surface of said lid depression and along at least a portion of said outer wall, indenting the latter lengthwise with a die having an angularly related cutting edge and coining face to provide a fractured but integral section in the outer wall along at least a portion of its length, the width of the face being a fraction of the lid thickness and said integral section being cold worked by the momentary partial separation induced by the coining face, and c. then swedging said ridge against said back-up die surface partly to close said indentation and force the mating metal of the fractured but integral section to flow into closer substantially sealed association.

Claim 13

The method of making a manually disruptable pop-in type of button closure in a sheet metal container lid, which comprises: a. forming a continuous trough and opposing rounded ridge protruding from the lid surface and defining a major portion of a relatively depressible closure, the closure having an outer wall portion sloping to the lid surface and not folded upon itself, and b. shear-coining said outer wall unfolded portion along a line spaced between the lid surface and the crest of the ridge against a convexly sectioned back-up die to form an indentation channel of approximately 0.001 inch to 0.002 inch in width and extending lengthwise in said wall and tapering from a maximum depth providing a locality of incipient fracture to a minimum depth, and leaving a locality of no indentation providing hingeable connection of the button to the lid.

Claim 14

The method of making a manually disruptable pop-in type of button closure in a sheet metal container lid, which comprises: a. forming a continuous trough and opposing rounded ridge protruding from the lid surface and defining a major portion of a relatively depressible closure, the closure having an outer wall portion sloping to the lid surface and not folded upon itself, and b. shear-coining said outer wall unfolded portion along a line spaced between the lid surface and the crest of the ridge against a convexly sectioned back-up die to form an indentation channel of approximately 0.001 inch to 0.002 inch in width and extending lengthwise in said wall and tapering from a maximum depth providing a locality of incipient fracture to a minimum depth, and leaving a locality of no indentation providing hingeable connection of the button to the lid.

Claim 15

The method of making a manually disruptable pop-in type of button closure for a low-pressure metal container lid comprising: a. depressing the lid in a closed continuous path to provide an integral button having a sectionally non-sinuous wall including opposite parallel surfaces inclined to the lid, and b. shear-coining the wall with an axially cooperating tool and die acting peripherally along a line spaced from the general plane of the lid to form a lengthwise, narrow, and angular indentation in one of said inclined surfaces, the width and angular disposition of a coining face of the tool being selected to momentarily induce local tension nearly but not quite sufficient to incur concommitant partial fracture of the wall portion worked against the die between the bottom of the indentation and the other of said surfaces.

Claim 16

The method of making a manually disruptable pop-in type of button closure for a low-pressure metal container lid comprising: a. depressing the lid in a closed continuous path to provide an integral button having a sectionally non-sinuous wall including opposite parallel surfaces inclined to the lid, and b. shear-coining the wall with an axially cooperating tool and die acting peripherally along a line spaced from the general plane of the lid to form a lengthwise, narrow, and angular indentation in one of said inclined surfaces, the width and angular disposition of a coining face of the tool being selected to momentarily induce local tension nearly but not quite sufficient to incur concommitant partial fracture of the wall portion worked against the die between the bottom of the indentation and the other of said surfaces.