DE7212780U - Full tear-off lid made of sheet metal for cans - Google Patents

Description

FR.WEHRSTEDT & SÖHNE BRAUNSCHWEIG '/ METAL FACTORY

March 29, 1972

"Full tear-off lid made of sheet metal for cans"

The innovation concerns a full tear-open lid for tin cans or similar containers made of sheet metal. The lid points a score line between the cover core wall on the one hand and a damping bead and a terrace-shaped Profile on the other hand runs. The cover can be torn open by means of a pull tab attached to it.

In contrast to the tear-off cover ¹ , according to cam German utility model No. G 71 27 60C ·. 7, the terrace profile (spring profile) is designed so that the concentric beads and shoulders do not run out like in the above utility model on a tendon of the cover surface transversely to the tear direction and mounting platform, but change their course like a chordal section.

In order to make it safe to tear open such a box, the Kert line is extremely close to the Cover core wall placed between this and the flat damping bead. The reverse arrangement, namely damping bead between core wall and core line is well known. The core line should be concentric evenly deep and be broadly incorporated; in order to reduce the particularly high stress during the cooking process, the Damping bead made correspondingly wide and flat.

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In order to make it much easier to unroll such a can, the lid is provided with a sheath-like transverse bead underneath the rivet platform. After breaking in on the tear line by lifting the flap, the tendon-like bead acts like a bridge in order to secure deformation of the lid when the flap is raised as well as any frizz. Uniform tearing on both sides is thus guaranteed.

The pull tab will be as close as possible to the tear line riveted in order to obtain the most favorable lever arm possible between the opening edge, rivet hole and grip hole. By a It is a particularly stable design in terms of the material as well as structurally through the folding of the stiffening edges possible to break open and tear open the lid without great effort, even if the lid is made of sheet aluminum is made of sheet steel.

In order to use as little force as possible when breaking open the To get a tear line, the boiling bead slowly tapers off in the direction of the rivet hole, thereby making the platform as large as possible and to keep the force during the deformation work when opening the lid as low as possible.

The two cams on which the pull tab can rest from above in the rest position are designed in such a way that that between the cam and the pull tab in the rest position there is enough air to avoid the lid being unintentionally bulged during the cooking process when the spring profile is dented is torn open.

The tear-open edge on the pull-tab is cut from the rivet hole bevelled approx. 5 ° upwards in order to avoid the possibility that the lid could unintentionally move during the cooking process or if the can is improperly transported, the can rips open due to high stress.

It is necessary that the break-open nose is mounted on the Kerblini-ί in the most precise geometric arrangement. This ensures that the tab on the

Lid remains in the predetermined position, even if torques should be exerted on the grip tab. Been installed for this reason Sinj to secure the position of the tab on the transition area between Kochsieke and the slope to the first terrace two cams to ^v lateral locking of the pull-tab. After the rivet head has been put on, a completely form-fitting anti-rotation device has been created, which can also be used in the same way for all other full tear-open lids.

The innovation is explained in more detail below with reference to drawings and an exemplary embodiment. There are also further ones Features of the innovation emerge from it.

Fig. 1.) shows a top view of the embodiment of the Lid, according to the innovation described above.

Fig. 2.) shows the cover described without the mounted pull tab in plan view.

Fig. 3 ·) shows a cross section through the cover

and a lid of FIGS. 1 and 2 which is crimped onto a can body.

Fig. K.) Illustrates the design of the grip tab in plan view.

The new cover, optionally made of sheet steel or aluminum, with any outer diameter, has from the middle of the cover, the cover surface (6) of which has an outwardly terraced profile with steps and bevels (3, k + 5). In addition to the uppermost terrace area (2 ^) there is the damping bead (2) on the outside, which is negative, but can also be shaped positively, ie that is directed negative inwards, positive outwards. Between the outer edge of the damping bead and the cover core wall (28) there is a narrow annular surface (29) at the same height as the top terrace surface (27). In this annular surface (29) the tear notch (10) is incorporated in a circle as a completely closed line, the so-called score line (10).

The damping seal (2) on the fastening platform of the rivet has been interrupted in order to obtain a sufficiently large platform for fastening the tear-open tab and to ensure that the tear-open edge can be broken open with as little effort as possible. The ends of the damping bead (2) run out very flat in order, as mentioned above, to keep the power requirement low. This Nietplattform is bounded by a chordal _t uersicke (l2), which end in the notches of the damping bead (25). The transverse bead (12) is more deeply embossed than the cooking bead in order to achieve complete rigidity from one end to the other and thereby to ensure that the lid is torn off evenly; this also prevents the cover from bulging upwards in the center line when it is torn open and thus coming into an unfavorable angle to the annular surface (29) when tearing open. The notches on the damping bead (2) at the transition between the cooking bead and tendon bead (25) are provided to ensure that the damping bead is easily bent downwards during the opening process.

A hollow rivet pin (ll) is made on the rivet platform (13) The material of the lid has been driven out in the same way as the hollow rivets in the leather and shoe industry has been known for decades. The pull tab (16) is riveted on by means of this rivet. The pull tab will go out made of strong, correspondingly high-strength material, in order to prevent it from kinking when it is broken open. To the risk of injury to switch off and at the same time to increase the stiffness of the flap, it is rolled up on all edges. In addition, it is still on both sides (20) at the height of the embossing of the rivet platform of the tab (19) folded down. The fold (20) prevents the flap from buckling when the score line is broken (10) avoided. The opening edge (2i) on the pull tab (l6) is only kept very narrow in order to meet the need for strength in the to keep the first work process, the break-up, as small as possible.

Due to the stiffness of the cover in the area of the rivet platform (18) Due to the tendon bead (transverse bead) (12), the score line (10) is reliably broken open and therefore a correspondingly good tear-off of the entire lid.

There is only a single score line which runs concentrically to the core wall (20) in the immediate vicinity thereof. The score line (10) itself becomes the immediate next to it DäiD ^ fungsbicke (2) lying on it and provided with well-placed radii against excessive stress during the Cooking profiles or protected in the event of improper transport.

The terrace profile, which in and of itself is a concentric Profile is known, but not in this circle-chordal shape Terrace, absorbs the increase in volume inside the can to a certain extent during the cooking process. The resulting deformation work is done by the damping bead on genonans,

Protection claims

Claims (1)

-G protection claims: In case of doubt, all of the features described or illustrated here, either individually or in any form and combination, are to be regarded as essential to the innovation. 1.) Full tear-open cover, optionally made of sheet steel or Aluminum, for cans or similar containers with a score line (OK) that is immediately concentric between a damping bead (2) and a cover core wall (28) runs, marked thereby net that the score line (10) extremely close to the lid core wall (28) runs between this and the damping bead (2). 2.) Full tear-off lid according to claim 1, characterized that the attenuation sirke (2) has a negative Si <~; ke, i.e. one pointing towards the inside of the can Bead can be. 3-) Full tear-open cover according to claim 1 + 2, characterized ₅ because it is provided with a pull tab designed as a two-armed lever, the break-open edge (21) is attached to the end of the shorter lever of the tab and viewed from the center of the cover directly on the Score line (10) lies. k.) Full tear-off lid according to claim 3 _? characterized in that the pull tab has a reinforcement at the side in that it is stiffened by folding down both longitudinal sides at the level of the embossing of its own rivet platform (18). 5.) Full tear-open lid according to one of claims 1 - k, characterized in that the cooking bead (damping bead) (2) is interrupted in the region of the rivet platform and it has a slight upward projection. 6.) Full tear-open cover according to claims 1-5, characterized. that the pull-tab (16) is locked sideways by two cams (7 + 8) and the pull-tab always remains in the geometrically exactly right position during assembly and transport; even if the tab should be ve nt, it is raised nichi. 7.) Full-Aufrejßdeckel according to claim 1-6, characterized marked. that the break-up nose is bent up by about 5 ° (30) and about the has the same radius as the score line (10). 8.) full tear-off lid according to claims 1-7, characterized in that the rivet platform by a tendon-like transverse bead (l2) _? which is shaped inwardly pointing towards the can, is limited to the 1st slope towards the terrace (3). It is deeper and narrower than the damping bead (2). 9.) Full tear-off lid according to claims 1-3, characterized characterized in that the damping bead (2) at the transitions between the damping bead (2) and the transverse bead (12) each has two short beads to prevent the damping bead from buckling at both ends when breaking in or out. Pull up to achieve. 10.) Full tear-off lid according to claims 1-9, characterized in that the two schnurr - bartiihn J ichcri, on the Ni etplat ί. 1'orm (13) seated, short, narrow corrugations (31) when the Aufreililiohc "ie a hinge act. - 9: -:::: '· .. ■ j. · Designations of the individual items 1. Lid If. Chef's bead ( 3. Slope to the terrace * i. outside terrace 5. Slope to the cover surface b. Cover mirror ^r /. left cam for locking the pull tab on the side 8. Right cam for locking the pull tab on the side 9. Lid edge for double folds 10. Score line 11. Rivet 12. Transverse bead (tendons - bead) 13. Rivet platform in. Döänenrüripf \ also Benäl terruinpf) 16. Pull tab 17. rivet hole 18. Rivet platform on the pull tab 19. Fold to stiffen the rivet platform 20. Stiffening fold on the bracket 21. Breakaway edge 22. Folding of the tab handle 23. Handle hole 2k. Cams for supporting the stacked cans or the closing head 25. Notch in the cooking bead at the transition between the cooking bead and tendon bead 26. Cams for supporting the pull tab 27. top terrace area; Transition between Koci.sicke and the slope to the first terrace 28. Lid core wall 29. Annular surface for receiving the score line 30. Fold the opening nose by approx. 31. "Mustache surround" with hinge effect