EP0676981A1

EP0676981A1 - Toe-jaw for a safety ski binding

Info

Publication number: EP0676981A1
Application number: EP94903824A
Authority: EP
Inventors: Helmut Wladar; Andreas Janisch; Karl Stritzl; Hubert Würthner
Original assignee: HTM Sport und Freizeitgerate GmbH
Current assignee: HTM Sport und Freizeitgerate GmbH
Priority date: 1993-10-29
Filing date: 1993-12-17
Publication date: 1995-10-18
Also published as: WO1995011732A1; ATA219193A; AT402696B

Abstract

The invention pertains to a toejaw for a safety ski binding with a casing (1) that attaches to a ski and with two two-armed angle levers (4a, 4b) that are pivotably mounted on a common bearing pin (5) that is subjected to a forward tensile force with at least one release spring (7) mounted in the casing. This release spring (7) is supported at its front end on a front spring support (8), from which a tension piece (6) mounted on the front spring support (8) passes outside the release spring (7) to the bearing pin (5). This release spring (7) is pretensioned using a screw bolt (10) which is mounted to the front face of the casing (1) and on which the front spring support (8) is mounted for longitudinal displacement, the screw bolt being arranged within the release spring in a per se known manner and having a threaded connection to a back spring support (9) on which the back end of the release spring is supported.

Description

FRONT JAWS FOR SECURITY SKI BINDING

The invention relates to a north jaw for a safety ski binding with a housing which can be fastened to a ski, and with two two-armed angle levers which are pivotably mounted on a common bearing pin which is loaded with a pulling force at the front with at least one release spring mounted in the housing, wherein this trigger spring is supported with its front end on a front spring support, from which a traction means leads to the bearing pin, and the pretensioning of this trigger spring can be predetermined via an adjusting means.

A front jaw of this type is known, for example, from DE-OS 3 720 440 (Geze). In this document, a toe with two sole holders is described, which are mounted on a common, slightly backward inclined bearing pin, on which a threaded sleeve, which leads to the front and at an angle downwards, engages, which has a female thread mounted on the front of a spring mount and an internal thread provided threaded bolt is connected, on this Federaufiiaufnahme, which is mounted in the housing in a longitudinally displaceable manner, the front end of a release spring is supported, which is supported with its rear end on the housing. The threaded bolt and the threaded sleeve thus simultaneously form the traction and adjusting means in this known front jaw. The line of action of the force of the release spring (threaded bolt / threaded sleeve) includes an angle with the bearing bolt that is less than 90 °, so that a downward force component of the release spring occurs, which enables the sole holder to be automatically adjusted to different shoe soles.

A disadvantage of this known toe piece is, for example, that the release characteristic of the side release can be influenced by the height and width of the shoe sole. Likewise, the display of the presetting of the release spring for this toe is dependent on the pivoting of the sole holder and thus on the shape and height of the shoe sole, which can lead to incorrect binding settings. Furthermore, the housing of the toe piece is not closed at the front, so that the function of this toe piece can be impaired by dirt or snow and ice. In a further known toe piece, which is disclosed in DE-OS 3 900 217 (Salomon), two two-armed sole holders, known as wings, are provided, which are each pivotably mounted on an elongated L-shaped lever articulated on an upper housing part, the short of which Lever arms are pressurized forward from the release spring via a piston guided in the housing. This piston is extended to the rear below the release spring and has a cross bolt at its end, which is guided along a ski-fixed control curve when the front jaw is triggered backwards, so that the release spring is spring-loaded when the sole holder is swung up via this extension, the L-shaped ones Lever and thus the sole holder are free laterally. In this known front jaw, the rear spring mount is connected via a thread to a screw bolt supported on a rear housing transverse wall, which enables the pretensioning of the release spring to be adjusted. A disadvantage of such a front jaw is, for example, that it is of extremely complicated construction, since a trigger mechanism is provided for the side trigger and the reverse trigger. Accordingly, the manufacture and assembly of this jaw are time consuming and expensive. Furthermore, the entire upper part of the housing is always raised in the event of a backward release, so that the release mechanisms of this toe piece can easily be impaired by impurities such as ice, snow or dirt.

The object of the invention is therefore to improve a front jaw of the type mentioned so that the above-mentioned disadvantages of known front jaws are eliminated. In particular, it is an object of the present invention to provide a toe piece in which a backward release mechanism is provided, the release characteristic of which can be specified differently in relation to the side release characteristic depending on the type of binding. Furthermore, such a front jaw should be simple to build and therefore inexpensive to manufacture.

On the one hand, these tasks are achieved on the basis of a toe piece of the type mentioned at the outset in that the adjusting means is a screw bolt supported on the end face of the housing, on which the front spring support is mounted in a longitudinally displaceable manner, the screw bolt being arranged in a manner known per se within the release spring and is connected via a wall to a rear spring support, on which the rear end of the release spring is supported, and, on the other hand, is released in that the traction means is a tension piece mounted on the spring holder, which leads to the bearing pin outside the release spring. This embodiment of a toe piece according to the invention has the advantage that the indication of the preload of the release spring is independent of the shape and height of the shoe sole. Furthermore, the housing is sealed in all directions, which prevents the toe from malfunctioning due to dirt, snow or ice. Furthermore, the introduction of a tension piece arranged outside the release spring enables a simple specification of the backward release characteristic in relation to the side release characteristic by selecting the point of application of this tension piece on the bearing bolt, without the installation position of the release spring having to be changed.

Another object of the present invention is to provide a toe piece in which the line of action of the force of the release spring, despite the inclined installation of this release spring, is essentially normal to the bearing pin of the angle lever, so that no forces occur in the direction of the bearing pin.

In a preferred embodiment of a toe piece according to the invention, the bearing pin is thus arranged essentially vertically, the points of attack of the pulling element on this bearing pin and on the front spring receptacle lying essentially in a horizontal plane.

This measure makes it possible, regardless of the installation position of the trigger spring, to advantageously design its force effect horizontally.

A further preferred embodiment of a toe piece according to the invention is characterized in that the tension piece is mounted on the front spring holder to be pivotable to a limited extent about a horizontal transverse axis.

This ensures that the line of action of the release force on the release spring maintains a defined position even when the sole holder is swung up in the sense of a reverse release.

A further improvement of the trigger mechanism in the sense of defined lever ratios is achieved in that the angle levers are supported upwards when pivoting upward on a substantially transverse edge of the housing and when pivoting diagonally on an edge running in the longitudinal direction of the housing.

This measure has the effect that both the backward and the diagonal triggering advantageously take place via an essentially constant lever arm which can be predetermined by the position of these edges. The mounting of the angle lever to the rear is further improved in a front jaw according to the invention in that each angle lever is supported to the rear against a stop provided on the housing. This stop is preferably a projection which projects downward from the housing and which has a transversely oriented stop surface on which a bearing head of the angle lever is supported with its rear end face.

This support on the one hand improves centering of the angle levers and on the other hand prevents the angle levers from being pressed down when a force acts on the sole holder from above.

Furthermore, an automatic adjustment of the sole holder of the angle lever to the height of the shoe sole is made possible in that the housing has a lower housing part and an upper housing part pivotably mounted thereon against the force of a hold-down spring.

This separation of the trigger mechanism from the automatic sole height adjustment mechanism prevents any interference between these two mechanisms.

Another advantageous embodiment of a front jaw according to the invention results from the fact that the release spring, the front and rear spring support and the tension piece, as well as the bearing pin and the angle lever are arranged in the upper housing part

This measure facilitates the manufacture and assembly of such a front jaw.

Further features of a toe piece according to the invention result from further dependent subclaims.

The present invention is explained in more detail below on the basis of an exemplary embodiment with reference to the accompanying figures, these figures showing:

1 shows a longitudinal central section of a toe piece according to the invention,

La shows an enlarged section of Figure 1,

Fig. 2 u. 2a shows a front view and a longitudinal section of the front spring support of a front jaw according to the invention, Fig. 3 is a detailed view of the upper housing part of a front jaw according to the invention viewed from below.

1 shows a front jaw according to the invention with a housing 1, which in the present exemplary embodiment consists of an upper housing part 2 and a lower housing part 3 which can be fastened to the ski, the upper housing part 2 being pivotably mounted on this lower housing part 3 against spring force. On the upper housing part 2, two two-armed angle levers 4a, 4b are supported, which are pivoted laterally on a common, essentially vertically arranged bearing pin 5, which is tensioned towards the front via a tension piece 6 with a release spring 7. In the present exemplary embodiment, the release spring 7, which is inclined with respect to the horizontal, consists of two longitudinal springs 7a, 7b which are arranged one inside the other and are mounted between a front spring support 8 and a rear spring support 9, the tension piece on the front spring support 8 delimiting about a horizontal transverse axis Q. is pivotally mounted and outside of the release spring 7 leads back to the bearing pin 5.

On the front side of the housing 1, a longitudinally aligned screw bolt 10 is supported to the rear, on which the front spring support 8 is mounted in a longitudinally displaceable manner and which is connected via an external thread 11 to an internal thread 12 of the rear spring support 9, whereby the pretensioning of the release spring 7 can be predetermined is. A pointer 13 is arranged on the rear spring support 9, by means of which the set pretension of the release spring can be read via a window 14 provided on the upper housing part 2. The exact design of the front spring support 8 is explained in more detail below with reference to FIG. 2.

The tension piece 6, which connects the front spring support 8 to the bearing pin 5 of the angle levers 4a, 4b, has an angled section 15, which is pivotably mounted on the front spring support 8 to a limited extent about the transverse axis Q, and a cranked section acting on a horizontal groove 16 of the bearing pin 5 17 on. On the angled section 17 in the longitudinal direction of the front jaw, a bore 18 is provided with an oval cross-section through which the screw bolt 10 is guided, the short axis of this bore 18 being aligned transversely to the front jaw, so that in the region of the longitudinal median plane between the screw bolt 10 and the angled section 15 of the pulling piece 6 is provided with an exemption, which enables the pulling piece to tilt about the transverse axis Q when the toe piece is triggered backwards. In which

i - In the present exemplary embodiment, the transverse axis Q and the groove 16 lie essentially in a horizontal plane, so that the line of action of the release force on the release spring 7 runs essentially horizontally despite inclined installation thereof, and therefore no forces occur in the direction of the bearing pin 5. The consequence of this mounting is that the point of application of the tension piece on the front spring support does not change in an advantageous manner even when triggered backwards or diagonally.

For the automatic adjustment of the angle levers 4a, 4b to the height of a shoe sole, the upper housing part 2 is pivotally supported against the force of a hold-down spring 19, which is mounted in the lower housing part 3 and against a stop 20 of the upper housing part, about a transverse axis lying in the front part of the jaw 2 works. In the present case, the hold-down spring 19 is designed as a leaf spring arranged in the longitudinal direction. The pivotability of the upper housing part on the lower housing part is further limited by a longitudinally displaceable locking piece 21. The exact design of both the mounting of the upper housing part on the lower housing part and of the locking piece is described in detail in parallel applications for property rights by the applicant, which is why it is not dealt with in more detail here.

The lower housing part 3 is bounded at the rear by a rear housing wall 21 which is formed at a distance behind the bearing pin 5 between the angle levers 4a, 4b, an elastic intermediate piece 22 being provided between the bearing bolt 5 and the rear housing wall 21, which prevents Contaminants such as snow, ice or dirt accumulate in this space, which could impair the function of the toe piece.

In Figures 2 and 2a, the front spring support 8 is shown using a front view and a longitudinal central section. This spring support 8 has a hollow cylinder 23, the inner surface of which is in sliding contact with the screw bolt 10. Arranged in the front section of this hollow cylinder 23 is an annular spring support surface 24, which is directed rearward normal to the outer surface of this cylinder and on which the front end of the release spring is supported. At the front, the spring support 8 has an essentially U-shaped guide groove 25 for the angled section of the pulling piece 6. In the horizontal plane of the hollow cylinder 23, a tilting edge 26a, 26b is formed in this guide groove 25 on both sides of the hollow cylinder, on which the angled section is supported to the rear. This tilting edge 26a, 26b is aligned along the transverse axis Q and thus forms the limited pivotable mounting of the tension member 6 on the front spring support 8. Above the horizontal center plane of the hollow cylinder 23 is formed a projecting sleeve segment 27 which is above this The horizontal center plane through the oval bore 18 of the angled section of the tension piece fills out the clearance between the screw bolt 10 and this angled section 15, thereby preventing the section 15 from being in contact with the screw bolt 10 and thus causing frictional losses. Below the horizontal median plane of the hollow cylinder, the clearance created by this oval bore 18 is not filled, so that the tension piece 6 can be pivoted as freely as possible on the tilting edge 26a, 26b. Furthermore, the front spring support 8 has a nose 28 which extends rearward above the spring support surface 24 and on which the release spring 7, in the present case the outer spring 7a of the two longitudinal springs 7a, 7b, is supported upwards.

In FIG. 3, viewed from below, the section of the upper housing part 2 shown enlarged in FIG. 1 a is shown, on which the angle levers are supported upwards or backwards. In the case of a pure backward release of the front jaw, in which the two angle levers are pivoted upwards, each angle lever 4a, 4b is supported upwards on an edge 29a, 29b which runs essentially transversely to the housing, so that in addition to a defined line of action in the case of such a release the force of the trigger spring is a defined and essentially constant lever arm. In the case of a diagonal release, in which the ski boot is released laterally obliquely upwards, the upwardly loaded angle lever 4a or, 4b is supported upwards on an essentially longitudinally oriented edge 30a or 30b, so that defined lever ratios are also created for this release process will. Furthermore, a downwardly projecting projection 31a, 31b is formed in the upper housing part 2 for each angle lever 4a, 4b, with each projection 31a, 31b having a vertical stop surface 32a, 32b which is oriented essentially normal to the longitudinal center plane of the front jaw, on each of which a bearing head 33a , 33b (shown in dashed lines in FIG. 3) of an angle lever 4a, 4b with its rear end face 34a, 34b, which is designed as a support surface, is supported to the rear. This support on the one hand ensures good centering of the angle levers and on the other hand prevents the angle levers from being pressed downwards when force is applied. This measure is essential insofar as there is no restoring force against a force from above due to the horizontal line of action of the force of the trigger spring.

Claims

PATENT CLAIMS

1.Front jaws for a safety ski binding with a housing (1) which can be fastened to a ski, and with two two-armed angle levers (4a, 4b) which are pivotably mounted on a common bearing pin (5) which is connected to at least one release spring mounted in the housing ( 7) is loaded forward with a tensile force, this release spring being supported with its front end on a front spring support (8), from which a traction means leads to the bearing pin (5), and the pretensioning of this release spring (7) via an adjusting means can be predetermined, characterized in that the adjusting means is a screw bolt (10) supported on the end face of the housing (1), on which the front spring support (8) is mounted so as to be longitudinally displaceable, the screw bolt being arranged within the release spring in a manner known per se and is connected via a thread to a rear spring support (9), on which the rear end of the release spring is supported, and that Traction means is a tension piece (6) mounted on the front spring support (8), which leads outside the release spring (7) to the bearing pin (5).

2. front jaw according to claim 1, characterized in that the pull piece (6) on the front spring support (8) about a horizontal transverse axis (Q) is pivotally limited.

3. toe piece according to claim 2, characterized in that the tension piece (6) has an angled, on the front of the front spring support (8) supported portion (15), wherein on the front of the spring support (8) in the area of this support in substantially horizontal tilting edge (26a, 26b) is formed, which forms the horizontal transverse axis (Q).

4. front jaw according to claim 3, characterized in that the tilting edge (26a, 26b) is arranged in the horizontal central plane of the screw bolt (10).

5. front jaw according to one of claims 1 to 4, characterized in that the pull piece (6) engages via a cranked portion (17) on a horizontally circumferential groove (16) of the bearing pin (5).

6. front jaw according to one of claims 1 to 5, characterized in that the bearing pin (5) is arranged substantially vertically and the points of application of the pull piece (6) on this bearing pin (5) and on the front spring support (8) substantially in lie on a horizontal plane.

7. front jaws according to claims 3 and 5, characterized in that the groove (16) of the bearing pin and the tipping edge (26a, 26b) of the front spring support lie in a horizontal plane, the bearing pin being oriented normal to this horizontal plane.

8. toe piece according to one of claims 1 to 7, characterized in that the pull piece (6) below the release spring (7) is arranged.

9. front jaw according to one of claims 1 to 8, characterized in that the angle levers (4a, 4b) are supported upwards when pivoting upward on a substantially transverse edge (29a, 29b) of the housing (1).

10. toe piece according to one of claims 1 to 9, characterized in that the

Angle levers (4a, 4b) are supported upwards in the event of a diagonal pivoting on an edge (30a, 30b) of the housing (1) which runs essentially in the longitudinal direction.

11. Front jaw according to one of claims 1 to 10, characterized in that each angle lever (4a, 4b) is supported towards the rear against a stop (31a, 31b) provided on the housing (1).

12. Front jaw according to claim 11, characterized in that the stop (31a, 31b) is a projection which projects downward from the housing (1) and which has a stop surface (32a, 32b) oriented essentially normal to the longitudinal center plane of the front jaw which supports a bearing head (33a, 33b) of the angle lever (4a, 4b) with its rear end face designed as a support surface (34a, 34b).

13. front jaw according to one of claims 1 to 12, characterized in that the front spring support (8) by means of a within the release spring (7) arranged hollow cylinder (23) on the bolt (10) is mounted for longitudinal displacement.

14. toe piece according to one of claims 3 to 13, characterized in that the angled section (15) of the pull piece (6) in the longitudinal direction of the toe piece Has Bohπing (18) with an oval cross-section, the short axis of which is oriented transversely to the front jaw and through which the screw bolt (10) serving as an adjusting screw is guided, between the bore (18) of the tension piece (6) and the screw bolt (10), At least above the tilting edge (26a, 26b), a sleeve segment (27) arranged on the front spring support (8) is provided.

15 _. Front jaws according to claims 13 and 14, characterized in that the hollow cylinder (23) and the sleeve segment (27) are formed in one piece with the front spring support (8).

16. Front jaw according to one of claims 1 to 15, characterized in that the housing (1) has a lower housing part (3) and an upper part (2) pivotably mounted thereon against the force of a hold-down spring (19).

17. Front jaw according to claim 16, characterized in that the hold-down spring (19) is a leaf spring mounted in the lower housing part (3), which acts on a stop (20) of the upper housing part (2).

18. Front jaw according to claim 16 or 17, characterized in that the release spring (7), the front and rear spring support (8) and the pull piece (6), and the bearing pin (5) and the angle lever (4a, 4b) in the Upper housing part (2) are arranged.