US2433161A

US2433161A - Ski fastening

Info

Publication number: US2433161A
Application number: US377691A
Authority: US
Inventors: Schwarze Paul
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-08-09
Filing date: 1941-02-06
Publication date: 1947-12-23
Anticipated expiration: 1964-12-23
Also published as: CH232390A

Description

Patented Dec. 23, 1947 Paul Schwarze, Saint Gallen, Switzerland Application February 6, 1941, Serial No. 377,691

In Germany August 9, 1939 Y 4 Claims. (Cl. 289-1135) The attachment of the boot to the ski is gen- I erally eiected by a strap passed and tightened around the heel whereby the front part of the boot is forced between jaws. For the good control of the ski in downhill running it is important that the back part of the boot is firmly pressed to the ski. Previous constructions, however, have the disadvantage that when the back part is swung upwards the tension is continuously increased and with it the force opposed to a. further upward swing. As the tension is already very strong in the original position, swinging upwards over a comparatively small angle is practically impossible, If the skier using such a binding should have fa fall he runs the risk of considerable injuries, as he cannot liberate himself from the binding. l

The present invention is an improvement over and above the prior propositions and consists in means which draw the rear part of the boot towards the ski in such ya way that the force acting against the upward movement of the boot heel does not continuously increase. A preferredembodiment consists in a spring which is mounted or formed in such a way that its parts come into springy action successively when the boot heel is raised.

In the accompanying drawing several embodiments of the invention are illustrated by way of example. Fig. l'is a side elevation of the centre part'of the ski with the boot and a spring acting on the latter. Figs. 2 and 3 are side elevations of other embodiments. Figs. 4, and 6 are details of the iittings of Fig. 3. In Fig. 1 the ski is indicated by I, its forward part being on the left of the drawing, 2 is the boot with its front part secured between the jaws 9. The heel of the boot is coupled to the spring 4 by the tting 3, The plate-shaped spring lies on the ski and is capable of sliding along it. It is held by the bridge 5 the upper part of which is conveniently formed as a roller. The back end 6 of the spring may be bent upwards in order to nd a check vat the bridge 5 when sliding forwards. 'I is a stop on the ski to prevent the spring from sliding backward more than is necessary.

The spring offers resistance to the upward movement of the boot heel and this resistance can be adjusted by altering the distance between the bridge 5 and the boot. During the upward movement of the heel the iitting 3 which is fastened to the boot and coupled to the spring takes the latter with it so that the springy part in front of the bridge is extended. While, therefore, the upward movement causes an increascausing the tension is ing spring tension, this increase is counterbalanced by the fact that the 'part of the spring lengthened. The equipment can be so arranged that when the rear end 6 of the spring strikes the.. bridge 5, or whenthe heel of the boot has reached a certain heightthe coupling .between the fitting 3 .and the spring 4 is automatically disconnected so thatthe skier'is free if he falls.

In` Fig. 2 the springconsists of several plates which can be so arranged that when sliding forwards the plates are freed one after the other fromA the bridge 5 so that finally only one plate is held by it. The spring'm-ay remain flat at the rear end so' that whenlthe skier falls it can slip out'of the bridge and be taken along with the boot. The bridge 5 is adjustable in such a way that the effective spring length or its tension can be altered. This is done in the embodiment shown in Fig. 2 by` supplying the bridge with a set-screw by which the distance of the spring from the ski caribe changed.

Fig, 3 shows .another advantageous embodiment consisting in a special shaping of the spring.A It is formed` of three parts of which the two parts II and I2 lbehind the .heel are directed upwardsand downwards whereas the third part I3 is arranged at an angle to the first two parts. The three parts are riveted together or so connected that they can easily be disconnected for better transport and re-assembled. An upward movement of the heel is first resisted by the great strength of the part I3 which can be reinforced by additional spring plates. The more, however, the heel is swung upwards the more do the parts II and I2 get into action by their displacement, so that the increasing tension is counterbalanced by the enlargement of the effective spring parts. According to Fig. 3 the adjustment of the spring is effected by a cam lever 8 with which for downhill running the spring can be so pressed to the ski that a considerable tension is already eiected when the heel of the boot is still on the ski. In the embodiment shown in Fig. 3 the fitting 3 snaps automatically into a recess of the spring part I I when the heel is depressed. As shown in Fig. 4 the iitting 3 is a small plate attached to the boot and has a nose I4 projecting towards the spring. The lower part of the spring Il in this figure is in longitudinal section, also in Fig. 5 which shows the same arrangement as Fig. 4, but with the boot heel in a raised position, From the latter and the shape of the recess I5, which is shown in the front elevation of the lower part of the spring II in Fig. 6 it will be seen in what 3 way the end of the spring Il can slip oil? the nose I4 when the boot heel has reached a certain height.

The front part of the boot can be introduced between the customary jaws which are tted with a leather strap. But it is of considerable advantage to employ a coupling according to my U. S. Patent er1-1925 87,0, s-asffin this @ease @the ridi-stance between the..;ijaws'andthe springican be' properly fixed in accordance with the size of the boot and the whole binding can thus be securely adjusted. By the combination of the present inventionvwith such a coupling of the front part of theboot to the jaws a hitherto unattainedtcontrolioftheski is ensured and at the Sametime the `safe .release of both the rear and frontdpartfif thefbootfat the otherwise dangerous forward fall. In a11em bodiments it is of course possible thatfin-the-beginning of or duringtgthe upward movement of `thebootheel the counteracting iorcelisincreased xifm-a small distance. L Thisdoesnotinuence the ,scope ,of the.; presentinven'ticnsj hich. is not. con- ;nned to, krthesspecies; shovslnjandidescribedbut comtothe upward l,movement of'the; heelftovr continuou'sly increase.

"Ieiaim:

i 1. Skil fasteningcomprisingiawsfonitheiski' for thefront "para f'jithe 'boomta Springaactme on the 'rear part efttneipott;imsuch 'azwaiytnat zwhen'theiheeigcf fthe.boot;.istmovedgiupwafds' its `parts -fom'e into Springs' Jgacitlbn 1 011e Llfter f' the .'rbther: Hwhereby .aicontimious increasecf 'its re- ;sisting fpre isgpreventeugaridga iitting .onisad Ljbootheelk adapted; to. lbecomeautomatica11yjeeugif ledj tosaid, spring. 4wh,enmsaidheel' isg'depressed ,.2. vSki fastening i Lt;oniprising ,l jaws .on the 'ski gfpr, thefronupa'rtgpf gthefboot:gajspring'acting en theJreanpaItof,the1 bootrin;sucIragwaythat when the" heei of' the bootismoye upwardsyits ...Parts .come .11330 ,eprinsy tactiqn Cessirely; means .t0 adiust'saidpriingrand fmxeansfattached "pto 'theyrean part:}of;1the bootfor coupling' itjto -said spring when the heel is termined angle.

3. Ski fastening comprising means on the ski adapted to engage the front part of the boot; a spring on the ski acting on the rear part of the boot in the sense of drawing it towards the ski, said spring being formed of two parts which fgextend 11p-rand downwardssandea third part awhich israrranged ai..anf1ang1e1,toifthe rst two parts said upand downwards extending parts ebeing adapted in such a way that during the first period of the upward movement of the boot lheel they act as unbending members and subse- .gquentiyipcomeainto springy action by their displacement, thereby counteraoting the otherwise continuous-increase of the tension.

L4."Ski*fastening comprising means on the ski forggengaging the front part of the boot; a spring adapted to be attachedr to the ski and to the rear parttofthetboot, said :spring forcing the, boot to `Qthefskiin suche, waythat whenmthe .heel of the lboot 'isf swung lupizvardsijthe, counteracting force oisaidgspring does not continuously increase; a .1, bridges. (mythe ski, for; holding? said L spring; and a .cam-lever.' at said'. bridgej for, adjusting the tenv sion f said spring.

raised over a prede- "'PAUL'LSCHWARZE.

JREFERENCESCITED A .-The'oliowingreferences are of.- record vin the .giefofthis; patent:

' UNITED STATES'QEA'IVENTS 'Number -Name y Date g"r2,1f92,870 Schwarze -.Y ..Mar.}5, 1940 FOREIGN PATENTS ,Number VCountry Date 6,651 'f Norway Man 23, 1898 '113576 Norway 1 1 Sept. 16, 1902 186,585 Switzerland K "Dec. 1, '.1936 f801g546 gFranee,-,- 1 Aug 6, 1936 "`52,8;63 :Germany -aufn-July 4,11931 1643,702 j'Germany,...v- Aug. 6,1937 5,271,046 Germany v lMar. 'i 3,- 1914 v61,530 Austria 'Oct.10, 1913