Receptacles – Closures – Having means for securing or retaining closure in its closed...
Patent
1993-01-04
1994-03-22
Moy, Joseph Man-Fu
Receptacles
Closures
Having means for securing or retaining closure in its closed...
29225669, 24272, B65D 4534
Patent
active
052956040
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to latches and in particular to toggle latches used for fastening and tensioning a closure band.
The invention has been developed primarily for releasably fastening and tensioning a closure band used to clamp a lid to the peripheral rim of a storage drum and will be described hereinafter with reference to this use. However, it will be appreciated that the invention is not limited to this particular field.
BACKGROUND ART
In the past, conventional off-the shelf toggle latches have been riveted or spot welded to an appropriate channel-sectioned band and used to secure the lids to the rims of the storage drums.
One disadvantage of using these conventional toggle latches is that their design and method of construction results in the pivoting points of the latch being spaced away from the connecting points of the latch which causes them to be bulky and to protrude significantly beyond the peripheral edge of the band. Such protuberances can cause damage to the storage drums during transportation and in some cases complicate the handling procedures.
A further major disadvantage resulting from the pivoting points of the latch being offset from the band, is that it is through these pivots that the closing force acts. Accordingly, it is not possible to properly tension the band against the drum at the point the latch overlaps the closure band. This can result in leakage from the drum at this point.
Another disadvantage is that the conventional toggle latches available are generally very difficult to attach to the closure band as the devices need to be manipulated into part-opened positions for welding or riveting.
When drums of this nature are used for the transport of dangerous goods, Commonwealth regulations require that the latches be secured so they cannot open during transportation. With many of the latches currently in use, this is achieved by tying down the toggle lever with wire passed through various apertures provided in the latch. Not only is the effectiveness of such methods in doubt, it can be a difficult, time consuming and expensive operation.
A further disadvantage with the conventional band to overlap during tightening of the latch. This additional operation increases the overall manufacturing cost of the assembly.
It is an object of the present invention to provide a toggle latch which will avoid or at least ameliorate the above disadvantages of the prior art.
DISCLOSURE OF THE INVENTION
According to the invention there is provided a toggle latch for releasably fastening and tensioning a closure band said latch comprising, a first member for connection to an end of said band, a second member for connection with the other end of said band, a lever hingedly connected adjacent a proximal end with said second member and a link member hingedly interconnecting said first member and said lever and being joined to said lever at a point spaced apart from said proximal end, said lever being movable between a first open position in which the extent of said lever diverges from said band and a second closed position in which said lever and link member nestably overlay said first and second members to draw said first member toward said second member.
In a preferred embodiment the latch in the closed position has an arcuate profile corresponding to the curvature of a peripheral edge of a drum for which the closure is intended.
In this case the band is of a generally channel-shaped section for retaining a lid to the rim of the drum and said first and second members of the latch have a slightly larger corresponding section so that the latch nestably overlays and follows closely the contour of the band.
Preferably the latch members are hingedly connected by means of integrally formed inwardly directed flared projections on one connecting part, captively retained in tapered slots provided in the corresponding part.
In a preferred embodiment the toggle latch nestably overlays and does not protrude significantly beyond the peripheral edge of the band. Preferably the l
REFERENCES:
patent: 2235567 (1941-03-01), Sabatt et al.
patent: 2257039 (1941-09-01), Dale
patent: 2304911 (1942-12-01), Harpold
patent: 2579975 (1951-12-01), Scott et al.
patent: 3637257 (1972-01-01), Uncapher
patent: 4135657 (1979-01-01), Benson et al.
patent: 5020839 (1991-06-01), Kalb
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