FR2527082A1 - JAWS AND ESPECIALLY FRONT JAWS FOR SKI SAFETY FASTENING - Google Patents

Abstract

The invention relates to a jaw-iron of a ski binding and it is to be achieved with simple constructional means that increased friction forces are compensated in the case of a continuous turning, backward or forward fall. For this purpose, a sole hold-down, which is swivellable about a transverse axle, rests against an abutment of the triggering system and is connected by control surfaces along its vertically extending edges which allow lateral opening when the sole hold-down has been pivoted about the transverse axle.

Description

 The present invention relates to a jaw, and in particular a front jaw for a ski safety binding, with a boot secured to the ski and receiving a spring, which spring is supported, at one end, on an adjustment screw and at the other end on a counter-stop which can be moved, against the force of the spring, in the longitudinal direction of the housing, which holds at least one sole plate pivotally placed on a bolt perpendicular to the top of the ski and secured to the ski in the departure direction , which sole support immediately rests on the counter-stop, on its side opposite the spring.

 A jaw of the above kind is for example described in the publication of Germanic patent NO 29 50 777. In the embodiment according to Figures 1 to 7, a two-part sole support is provided, which is configured so as to correspond to a lateral and vertical support of the ski boot.

The two parts of the sole support are pivoted around the bolt arranged in the box integral with the ski. The two sole support parts are under the effect of a piston which, for its part, is biased by a spring. The effect of the spring-loaded piston on the two parts of the sole support occurs by two extensions of the piston. Each extension rests on a front wall of the corresponding part of the sole support. For lateral pivoting of one of the two parts of the sole support, the latter requests the extension of the corresponding piston and pushes the piston in the longitudinal direction of the ski, against the force of the spring. As this jaw only allows a purely horizontal outward pivoting of the parts of the sole support, a frictional force also occurring between the sole of the ski boot and the parts of the sole support during a fall, by turning, towards the rear, intervenes so that the detachment force is increased and that one no longer obtains, in all circumstances, a detachment that cannot damage the skier's leg.

 A jaw, which at least partially compensates for the high friction occurring between the means securing the sole and the sole of the ski boot for a fall backwards, is known from the publication of Germanic patent NO 28 12 149. The support for sole of this embodiment is in one piece, and is securely connected to a stirrup. This stirrup is pivotally placed around a support axis disposed on a shoemaker, and around this axis, the sole support is also pivotally disposed. The housing is rotatably arranged around a pivoting pin erected perpendicularly above the ski. This pivoting trunnion has a flattening which serves as a support for an elastic locking system. The locking system of one embodiment mainly comprises a spring bearing at one end on a counter-stop, the other end of which is biased. a piston, which on its side carries a tilting element disposed on it pivoting, and which is pressed, by the force of the spring, against the pin.

When the sole support is raised, it pivots with the stirrup around the support axis. A transverse piece connected to the stirrup stresses the tilting element which is partially freed from the flattening of the pin and which compresses the spring. This leads to a decrease in the magnitude of the locking force, and thus the resistance force produced by the friction between the sole of the ski boot and the sole support is compensated. However, this front jaw has a significant drawback, in that its construction is expensive and that it has many parts, whereby additional frictional forces are produced inside the front jaw.

 The present invention therefore has the task of configuring a jaw in the above manner so that compensation for the frictional forces occurs additionally during a fall in rotation backwards, between the sole support and the sole of the ski boot is obtained, as well as a desired constant detachment force for this direction of fall, if necessary also a decrease in the detachment force, and yet this jaw being of simple construction.

 The problem posed is solved according to the invention by the fact that the sole support is arranged so as to be able to pivot upwards in a limited manner around another axis transverse to the longitudinal axis of the ski and the bearing surface. of the sole support is a flat and mainly rectangular surface, whereby the two zones laterally delimiting the support surface of the sole support, considering the part remote from the top of the ski, are provided, on the half Up to two thirds of the height extent of the bearing surface, of a guide surface whose median lines converge in the direction of the top of the ski and which have an acute angle relative to the longitudinal axis of the ski.

 This jaw is very simple to build.

By the configuration according to the invention, the bearing surface of the sole support acting with the sliding guided counter-stop in the housing against the force of the spring and by its pivoting arrangement upwards, is obtained during a fall in rotation backwards, at the same time as the pivoting movement of the sole support, which takes place towards the side, also its pivoting upwards, therefore a rotation of the sole support takes place by means of its guide surfaces on the counter-stop of the spring, thus this does not carry out any further compression of the spring. By the measurement according to the invention, one obtains a compensation of the friction forces occurring moreover between the sole support and the sole of the ski boot and a constant detachment force is thus obtained, also in the event of a fall backwards. it is left to the manufacturer a relatively large clearance regarding the configuration of the guide surfaces, so that the detachment force, during a fall in rotation towards the rear can also be weaker than in the case of a simple lateral detachment.

 According to another characteristic of the invention, the other axis provided transversely to the longitudinal direction of the ski, for the pivoting support of the sole support, is formed by two fusing pins, which are arranged on an intermediate sleeve which is placed in a hole in the sole support and is arranged on a bolt secured to the ski, which can advantageously be moved in the direction of its height.

In this way, a particularly simple arrangement is guaranteed, from the construction point of view, of this other axis, and at the same time there can be an adjustment in height of the sole support to adapt it to various thicknesses of the ski boot sole. .

 According to another configuration of the invention, the sole support is traversed by another hole crossing the hole receiving the intermediate sleeve, and which is inclined at an angle with the top of the ski, in the direction of the end of the ski and is in a plane perpendicular above the ski and parallel to the longitudinal axis thereof, and it allows limited pivoting movement of the sole support around the pins.

 Another configuration of the invention relates to the guide surfaces, which are either continuously rounded or else have the form of oblique surfaces whose transition edges with the other parts of the sole support are rounded. Depending on the quantity of which the lateral detachment force must be able to be modified according to the magnitude of a vertical force, one or the other of the two variants of configuration of the guide surfaces will be chosen.

The invention will be better understood, and other objects, characteristics, details and advantages thereof will appear more clearly during the explanatory description which follows, made with reference to the appended schematic drawings given solely by way of example illustrating a embodiment of the invention and in which
- Figure 1 shows a jaw according to the invention in side view, in section;
- Figure 2 shows the jaw according to the invention in top view, in section along the line II-II of Figure 1;
- Figure 3 shows the m choire during a lateral detachment, also in top view; and
- Figure 4 shows the front jaw with sole support pivoted upwards, in side sectional view.

 On a ski 1 is fixed a housing 2 by means of screws which are not shown. The housing 2 can also be arranged on a base plate which is sliding in a known manner on a guide rail integral with the ski, in the longitudinal direction thereof, and which can be stopped at various positions. On the housing 2 is disposed a sole support 4 in one piece, so as to be able to pivot around a bolt 3 perpendicular to the top of the ski, in a plane parallel to the top of the ski. The sole support 4 envelops the ski boot sole represented> in a known manner, both from above and laterally. The bolt 3 is provided with a thread 3a on which rests an intermediate sleeve 5 with a counter thread. The intermediate sleeve 5 carries two pins 5a merging with each other, which are arranged in the direction of departure of the jaw, parallel to the top of the ski and at right angles to the longitudinal axis thereof. The sole support 4 is placed so as to be able to pivot upwards around the pins 5a in a manner which will be described. The intermediate sleeve 5 represents an autonomous part to which the sole support 4 is connected by the pins 5a. At its end remote from the top of the ski, the bolt 3 is provided with a screw head, into which can be inserted an actuation tool, for example a screwdriver. By turning the bolt by means of the tool, it there is a displacement in height of the intermediate sleeve 5 and thus of the sole support 4, so the latter can be adapted to various thicknesses of the ski boot sole. The bolt 3 is riveted, at its end remote from the screw head, to the housing 2. In this case, there is also a lateral pivoting of the sole support 4 by a rotation of the intermediate sleeve 5 along the thread 3a of the bolt 3 somewhat over a range of 1/4 of a full thread. The arrangement can however be designed so that the bolt 3 is not riveted to the shoemaker 2, but pivots at the same time as the sole support 4.

 The sole support 4 is, in its part remote from the ski boot not shown, provided with a support surface 6, which is of mainly rectangular shape and which is perpendicular to the top of the ski and at right angles to the longitudinal axis of the ski, in the starting position of the jaw. The bearing surface 6 of the sole support 4 is, in its parts facing the lateral edges of the ski, provided with two guide surfaces 6a continuously rounded. The median lines of the two guide surfaces 6a converge towards the top of the ski and also form an acute angle with the longitudinal axis of the ski and represent, considering the area of the bearing surface 6 distant from the top of the ski , a little more than half to two thirds of the height extent of the support surface 6.

 The hole receiving the intermediate sleeve 5 of the sole support 4 crosses another hole 8, the diameter of which corresponds to the diameter of the first hole and which forms an acute angle with the top of the ski. The two holes are in the same plane perpendicular to the top of the ski and parallel to the longitudinal extent of the ski. The hole 8 allows the sole support 4 to be pivoted upwards around the pins 5a.

The inclination of the bore 9 relative to the top of the ski advantageously corresponds to the inclination of the guide surfaces 6a of the bearing surface 6 relative to the top of the ski.

 The sole support 4 is held in the starting position by an elastic preload installation biasing the bearing surface 6. Thus, the bearing surface 6 of the sole support 4 is held in the starting position by the flat front surface 9a of a counter-stop 9 in the form of a sheath biased by a spring 7, and which is guided sliding inside the housing 2 in the longitudinal direction thereof.

The end part of the spring 7 which is distant from the sole support 4 rests on another counter-stop 10 which rests against an adjustment screw 11. The preload of the spring 7 can be adjusted in a known manner by turning the screw 11, and the adjusted stress of the spring can be read by an indication installation 12 indicated in FIG. 1 in a known manner.

 The displacement process in the case of a purely horizontal detachment can be seen in FIG. 3. If the sole support 4 is loaded horizontally by the ski boot which is not shown, then it pivots around the bolt 3 and the part of the lateral edge of the bearing surface 6 of the sole support 4, which corresponds to this pivoting direction and which is located below the guide surfaces 6a pushes the counter-stop 9 in the housing 2 against the spring force 7. In the case of a purely horizontal detachment, the guide surfaces 6a of the bearing surface 6 of the sole support 4 are not used.

 If a rearward rotation fall occurs, in this case, the ski boot, not shown, acts with a force indicated in FIG. 4 by the arrow Fz on the sole support 4. By this force action, the sole support 4 pivots around the pins 5a of the intermediate sleeve 5, the upper limit edge of the bearing surface 6 moves the counter-stop 9 against the force of the spring 7 in the direction of the ski. During the pivoting movement occurring at the same time from the sole support 4 around the bolt 3, the guide surface 6a of the sole support 4, corresponding to this direction of pivoting, comes into use because the sole support 4 rotates along the guide surface 6a on the counter-stop 9, there is therefore no longer any compression of the spring 7. The additional forces of friction which arise, if the sole support cannot pivot upwards, between the sole of the ski boot and sole support, and which make detachment more difficult, are compensated by the measures according to the invention, on the one hand the limited upward pivoting of the sole support 4 and on the other hand the formation of guide surfaces 6a.

Depending on the angular position of the guide surfaces 6a relative to the top of the ski in the departure direction, the detachment force present in the case of a fall in rotation occurring rearward is either equal to that of a detachment purely horizontal, but it can also be reduced.

In summary, it should also be noted that the manufacturer has a clearance concerning the oblique position of the guide surfaces, their width as well as
the measurement of the upward pivoting of the sole support. it is likewise possible, instead of providing rounded guide surfaces, to provide flat surfaces, the transition edges of which towards the other parts of the sole support are rounded.

Claims (4)

 1.- Jaw, in particular front jaw for a ski safety binding with a box integral with the ski and receiving a spring, said spring being supported, by one end, with an adjusting screw and by the other end with a sliding abutment in the longitudinal direction of the housing against the force of the spring, which maintains at least one sole support in the starting direction, which is pivotally placed on a bolt perpendicular to the top of the ski and which is integral with the ski, said support sole immediately resting on the counter-stop on the side opposite the spring, characterized in that the sole support (4) is arranged so as to be able to pivot upwards in a limited manner around another axis transverse to the axis longitudinal of the ski and in that the bearing surface (6) of the sole support (4) is a flat and mainly rectangular surface, and the two parts laterally limiting the bearing surface (6) of the sole support (4 ), considering at p starting from their area remote from the top of the ski, to a measure of half to two thirds of the height extent of the bearing surface (6) are each provided with a guide surface (6a) the median lines converge towards the top of the ski and form an acute angle with the longitudinal axis of the ski.  2. Jaw according to claim 1, characterized in that the other axis transverse to the longitudinal direction of the ski and provided for the pivoting arrangement of the sole support (4) and is formed by two pins (5a) fusing one with the other, which are arranged on an intermediate sleeve (5) which is located in a bore in the sole support (4) and which is arranged on a bolt (3) integral with the ski, advantageously adjustable in the direction of its height.  3.- Jaw according to any one of claims 1 or 2, characterized in that the sole support (4) is traversed by another bore (8) crossing the bore receiving the intermediate sleeve (5) which is inclined in forming an angle with the top of the ski, in the direction of the end of the ski, which is in a plane perpendicular to the top of the ski and parallel to the longitudinal axis of the ski and which allows the sole support ~ (4), the limited pivoting movement around the pins (5a).  4. A jaw according to claim 1, characterized in that the guide surfaces (6a) are either continuously rounded or else have the shape of oblique surfaces, whose transition edges with the remaining part of the sole support (4) are rounded.