Buckles – buttons – clasps – etc. – Strap tighteners – Accordion straps
Patent
1995-07-25
1997-02-11
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Strap tighteners
Accordion straps
24 70SK, 24 71SK, 36 501, A43B 500, A43C 1100
Patent
active
056008740
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a central closure for shoes with a rotatably mounted sheave for at least one rope-like tightening element for closing the shoe, in which the sheave is coupled to a gear by an actuating element and can be driven via the latter and the number of revolutions of the sheave can be limited by a stop.
Such a central closure, designed as a rotating closure, is known from EP-0 393 380 B1. The fact that the number of revolutions of the sheave is limited to somewhat less than two full revolutions is necessitated there by application of the pulley principle. In this case, one pulley is formed by the sheave. This has a carrier, which can stop after about one rotation on a rotatable arm, whereby said arm represents the towed sleeve target and can strike with a stop block against a housing edge. In this case, small structural dimensions are sought, even though a longer pull path to close the shoe is necessary.
In this known device, the diameter of the sheave must be selected in accordance with the rope path and the not quite two complete revolutions of the sheave that are possible there. In the case of long pull paths, therefore, the diameter of the sheave is also to be selected suitably large. In the case of this known device, therefore, freedom in the selection of the sizing of the dimensions of this device is greatly restricted.
On the other hand, the number of revolutions of the sheave could be increased by using additional pulleys, so that a longer pull path could be handled by increasing the number of turns on the sheave. This would, however, require a larger structural volume corresponding to the thickness of the additional pulleys.
SUMMARY OF THE INVENTION
With this invention the object is to be achieved, i.e., with a limitation on the number of revolutions of the sheave improving a central closure of the above-mentioned type in such a way that it is to be possible to increase the number of revolutions of the sheave to be limited without scaling-up the structural volume.
This object is achieved with the features of claim 1.
With the aid of the device for limiting the number of revolutions of the sheave based on the principle of a planetary gear, it is possible in a simple way, through the selection of the transmission ratio of the gear as well as the arrangement of stop(s), to select the number of revolutions of the sheave independently of outer dimensions within relatively broad limits, for example, at a ratio of between 2:1 to 10:1. Thus, by changing, for example, increasing the diameter of the toothing of the sheave and correspondingly changing, for example reducing the diameter of the freerunning gearwheel, a prescribed central closure with transmission ratios adapted to the respective application can be produced, with no other structural changes being necessary.
Below, the invention is described in more detail based on the embodiments illustrated in the drawing. Here:
FIG. 1 shows a side view of a central closure according to the invention in one section through the central axis (cross section),
FIGS. 2 to 4 show one view each along section I--I of FIG. 1 in, in each case, another set position with a pinion gear, in which the toothing of the immovable part has the larger diameter and
FIGS. 5 to 7 show one view each along section I--I of FIG. 1 in another set position, respectively, with a pinion gear, in which the toothing of the immovable part has the smaller diameter.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1, a central closure for shoes, especially for sport shoes, leisure shoes, or shoes for rehabilitation, is depicted from the side in cross section--i.e., in a section through the central axis, which has a housing part 1, designed as a flat housing shell, with a circular recess 2 to accommodate a sheave 3. Sheave 3 can be driven with a gear, which is provided between sheave 3 and a rotating element 33 that can be actuated from outside or by another actuating element, for example a lever or lever system.
Preferably a gear as de
REFERENCES:
patent: 4433456 (1984-02-01), Baggio
patent: 4748726 (1988-06-01), Schoch
patent: 4787124 (1988-11-01), Pozzobon et al.
patent: 4841649 (1989-06-01), Baggio et al.
patent: 4916836 (1990-04-01), Baggio et al.
patent: 5042177 (1991-08-01), Schoch
patent: 5152038 (1992-10-01), Schoch
PUMA AG Rudolf Dassler Sport
Safran David S.
Sakran Victor N.
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