JPH02282049A - Separable lid of vessel - Google Patents

Abstract

PURPOSE: To simplify an anti-rotation mechanism for detaching a lid from a container by forming a non-circular joint moving member connected to a rivet opening portion by part of an axis disposed opposite the rivet opening as the anti-rotation mechanism. CONSTITUTION: A detachable lid 1 is completely removed by a circularly pitched channel 3 formed at outside a lid plate 2. A perforating blade tip 4 for a pulling notch 5 is disposed on the pitched channel 3 and the pulling tongue 5 has a gripping tab 6 on the rear end thereof. A mounting portion 7 of the pulling tongue 5 is provided with an elliptical rivet opening 8 which encloses an elliptical axis 9 of a rivet 10 made of the lid plate 2 and the rivet 10 has a longitudinal axis line 11. This enables simplification of the anti-rotation mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pull-off lid for containers, particularly can containers.

A known pull-off lid of this type (U.S. Pat. No. 4,596,342)
According to the state of the art considered therein (column 1, line 57), the rivet holes are, for example, quadrilateral or hexagonal, and according to the patented invention disclosed therein: The rivet hole has 8 to 10 sides (column 1, line 67). When a tension knob and a circular or cylindrical rivet are joined to each other before riveting according to lines 411, 32nd to 40th, between the rivet hole and the side of the rivet hole to facilitate this joining. There is a lot of play. During riveting, the metal of the rivet shaft is allowed to expand outward until it contacts the sides of the rivet hole, thereby eliminating the initial play.

By this method, the tension knob is centered with respect to the rivet.

According to Column 3, Lines 47 to 51, the cover surface is parallel to the rear end of the flat piece of the tension knob and immediately adjacent to the flat piece in order to restrict the rotation of the tension knob around the rivet. A rotation limiting mechanism is provided in the form of an upwardly extending corrugated stop projection running in close proximity.

Known sliding lid (West German Publication No. 25 37)
No. 874) has a lid that can be partially pulled open, that is, only a portion of the lid plate can be pulled open. The circular rivet 2 is formed of a cover plate.

The rotation limiting mechanism is composed of two protrusions formed from the cover plate. However, by lifting the gripping tab slightly, the gripping tab and the protrusion are brought out of contact with each other, so that from this point on the gripping tab is free to rotate about the rivet.

This rotation is highly undesirable since the optimal operating position of the pull knob relative to the lid surface is lost.

It is known from DE 27 20 787 to form a further rivet from the cover plate radially inside the rivet in the specific embodiment according to FIGS. 7 and 8, in which the further rivet A metal plate tab attached to the tension knob is fixed to the top. Depending on the rigidity of the metal plate ears, rotation of the pull tab with respect to the lid plate can be prevented, but the manufacturing costs are very high.

Moreover, since the rivets are located relatively close together, especially in the specific embodiment according to FIG. 7, damage to the cover plate is not eliminated during the formation of the rivets.

It is known from DE 1 958 069 to form an auxiliary rivet with a cover plate on the radially inner side of a circular rivet.

When the gripping tab is lifted, the auxiliary rivet is first pulled off, creating an additional ventilation inlet or outlet. Once the auxiliary rivet is pulled out using the recommended process, there is nothing to prevent unwanted rotation of the pull tab relative to the rivet.

Two different embodiments of the anti-rotation mechanism are described in U.S. Pat.
82 586. According to FIGS. 1 to 3 of the first embodiment, a small protrusion is formed on the cover plate, and the small protrusion is surrounded by a substantially semicircular notch provided in the fixing portion of the pull knob. The notch 19 remains engaged with the protrusion even when the tension knob is operated. However, this was not planned.

Rather, when the tension knob is operated, the lower edge of the cutout sequentially slides up and over the sloping outer surface of the projection, resulting in undesired rotation of the tension knob relative to the circular rivet. The second embodiment according to FIGS. 4 and 5 has tangential wave-shaped protrusions on the lid surface. The tangential corrugation is located behind the abutment surface corresponding to the fixed portion of the pull knob and is supported to prevent rotation of the pull knob about the circular rivet. However, this effect is again questionable, since the deformation of the lid plate and the tension knob that occurs during operation results in the failure of engagement between the joint surface and the corrugated projection.

From US Pat. No. 3,432,068 two rivets are known which are arranged next to each other. Anti-rotation is thereby achieved, but this is also quite expensive.

In particular, the tension knob must be particularly wide, which requires a corresponding amount of metal plate. The perforation and tearing action becomes less easy. Since the rivets are located relatively close to each other, the quality of the lid plate is adversely affected.

The object of the invention is to simplify and improve the anti-rotation mechanism in this type of separation.

This object is achieved by the features of claim 1. The pull-off lid can be partially or completely removed. Possible metals for the pull-off lid or pull-out knob are very thin metal sheets, so-called thin steel sheets, in particular tinplate sheets or aluminum sheets. The non-circular shape of the opposing portion of the rivet opening and rivet shaft effectively prevents rotation of the tension knob relative to the rivet. This applies to the initial position and all operating positions until the can is opened. The anti-rotation mechanism can thereby be realized as economically as possible. No separate rivets, protrusions or protrusions are required. In any case, the rivet is simply non-circular, so there are no problems with space, manufacturing or operation.

In the embodiment according to claim 2, all rotation of the tensioning knob relative to the rivet can be prevented within a selected narrow range.

The embodiments according to claim 3 or 4 are particularly advantageous from the point of view of production technology.

In all cases, rotation of the tensioning knob about the longitudinal axis of the rivet is almost completely prevented, so that the tensioning knob always remains in its optimal central operating position relative to the lid surface.

Embodiments of the invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a pull-off lid 1, in this case a pull-off lid l
are completely removed by the circular grooves 3 formed on the outside of the cover plate 2.

The perforating cutting edge 4 of the tension knob 5 is disposed on the groove 3. The tension knob 5 has a gripping tab 6 at its rear end.

The attachment part 7 of the tension knob 5 is an oblong rivet opening 8.
have. The oblong rivet opening 8 surrounds an oblong shaft 9 (FIG. 2) of a rivet 10 formed from the cover plate 2. The rivet 10 has a longitudinal axis it! It has 11.

FIG. 3 clearly shows the components mentioned above and their interaction. The fit between the outer surface of the shaft 9 and the rivet opening 8 can be made as close as desired to substantially prevent rotation of the pull knob 5 relative to the rivet 10.

[Brief explanation of drawings]

Fig. 1 is a plan view of the pull-off lid, Fig. 2 is a plan view of a portion of the pull-off cover shown in Fig. 1 viewed from below, and Fig. 3 is an enlarged longitudinal sectional view taken along line mm in Fig. 1. . 1... Pull-off lid 2... Lid plate 3... Circular groove 4... Drilling cutting edge 5... Pulling knob 6...
Gripping tab 7... Attachment is done in part 8... Oval rivet opening 9... Shaft 10... Rivet 11...
・Longitudinal axis patent applicant

Claims (1)

[Claims] 1) The shaft of the rivet (10) formed from the cover plate (2) (
a pull knob (5) having a non-circular rivet opening (8) surrounding the rivet (9) and held on the lid plate (2) by a rivet (10); 10) In pull-off lids for containers, especially can containers, equipped with a prevention mechanism to prevent rotation of the pull knob (5) about the longitudinal axis (11), the rivet opening (
8), wherein at least a part of the shaft (9) located opposite to the rivet opening (8) forms a non-circular fitting interlocking member that engages with the rivet opening (8) as a rotation prevention mechanism. . 2) A tear-off lid according to claim 1, characterized in that the interlocking members (8, 9) are provided with a relatively tight sliding fit, at least substantially free of play. 3) A pull-off lid according to claim 1 or 2, characterized in that each interlocking member (8, 9) has an oval cross section. 4) Each interlocking member (8, 9) is provided with a cross section that is at least approximately elliptical.
The removable lid described in paragraph 2 or paragraph 2.