Buckles – buttons – clasps – etc. – Strap tighteners – Cam lever and loop
Patent
1993-02-17
1995-06-06
Brittain, James R.
Buckles, buttons, clasps, etc.
Strap tighteners
Cam lever and loop
A43C 1114
Patent
active
054210658
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a lever fastening device for footwear.
Lever fastening devices for footwear are known. In particular, fastening devices are known comprising a strap or band fixed at one end to a side of the vamp of the footwear and securable at its other end to the other side. A lever tensions the strap, to hence fasten the footwear.
To prevent accidental opening of the footwear during use, the tensioning lever is associated with a locking member, which prevents its operation unless this latter has been intentionally released.
This locking member operates on the basis of being set considerably beyond a dead centre position at which maximum tension occurs. However, the fact of considerably exceeding this dead centre position means on the one hand that the tension is no longer a maximum, and on the other hand that a considerable force has to be applied to unfasten the footwear.
In addition the fact that the locking member has to be set considerably beyond the dead centre position means that it is very bulky in a direction perpendicular to the vamp, thus making the fastening device unsuitable for application to light footwear in general (jogging, trecking, gymnastics, motorcross, cross-country etc.).
Moreover, the known fastening devices with a lockable lever generally do not allow complete separation of the two parts secured to the two sides of the vamp, this often hindering complete opening of the footwear.
EP-A-0 093 458 describes a lever joined at a base plate fixed to one side of the vamp and a traction element, joined to this lever in correspondence of a transverse pin different from the articolating pin of the lever to the base plate. This traction element removably engages with the other side of the vamp. This is a traditional lever which is constructed in only one piece.
To overcome this latter drawback, fastening devices have been proposed in which the two elements cna be completely separated, but in this case no means are provided for locking the lever in the fastened state.
An object of the invention is to provide a fastening device for footwear in general, provided with a lever which can be locked in the fastened position.
A further object of the invention is to provide a fastening device of small overall size.
A further object of the invention is to provide a fastening device in which the two parts secured to the two sides of the vamp can be completeley separated from each other.
A further object of the invention is to provide a fastening device which can be unfastened by very comfortable and easy operation of the lever.
These and further objects which will be apparent from the description given hereinafter are attained according to the invention by a lever fastening device for footwear in general as described in claim 1.
The present invention is further clarified hereinafter with reference to the accompanying drawing in which:
FIG. 1 is a longitudinal section through a device according to the invention with the lever engaged with the securing member but not yet in the fastened conition;
FIG. 2 shows it in the same view as FIG. 1, but in the fastened condition;
FIG. 3 is a modified embodiment thereof, shown in the same view as FIG. 2;
FIG. 4 is a plan view thereof in the direction IV--IV of FIG. 2,
FIG. 5 is a same view as FIG. 1 of a second embodiment, and
FIG. 6 is a plan view thereof.
As can be seen from the FIGS. 1-4, the device according to the invention comprises substantially two separate parts, secured to the two sides of the footwear vamp. The first part consist of a strap 1 with one end free and the other end hinged to a tensioning lever 2. The free end can comprise transverse toothing, by which the strap adjustably engages a suitable retaining member fixed to one side of the vamp but not shown in the figures. At its other end the strap 1 is fork-shaped and is hinged through both its prongs 4 to the tensioning lever 2, on a transverse pin 5 situated in approximately a central position.
That part of the lever 2 extending from said pin 5 in the direction away from the strap 1 c
REFERENCES:
patent: 3345705 (1967-10-01), Gaupp
patent: 4651392 (1987-03-01), Olivieri
patent: 4796336 (1989-01-01), Scully
patent: 4928359 (1990-05-01), Gagnebin
AM S.r.l.
Brittain James R.
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