Education and demonstration – Physical education – Skiing
Reexamination Certificate
2000-06-30
2003-02-25
Banks, Derris H. (Department: 3712)
Education and demonstration
Physical education
Skiing
Reexamination Certificate
active
06524110
ABSTRACT:
This invention relates to body supports and teaching aids, particularly, but not necessarily exclusively for use during skiing.
Skiing is a sport enjoyed by considerable numbers of skiers over a wide age group. Even relatively gentle skiing down ski runs that are not severe and better suited to less experienced skiers imposes considerable strains on the muscles of the skier, particularly in the legs, resulting from the skier adopting an incorrect stance or posture along with the repeated impacts of the skis with uneven compacted snow or ice causing a bouncing effect that the skier must combat by repeatedly bending the legs, whilst at the same time the legs must continue to support the skier. The more severe is a ski slope, the greater is the stress on the legs, and consequently all skiers, whether young and with leg muscles not yet fully developed, in their prime and wanting to ski for prolonged periods in difficult conditions, or more elderly and with leg muscles past their prime, can benefit from the use of body weight supports that assist in setting the skier in a correct position.
Body weight supports and teaching aids must not only allow a part of the body weight of the skier to be removed from the skier's legs, but also must allow the legs to bend at the knee, and additionally must not inhibit a skier from moving the hips laterally to incline the legs to set the skis on edge and allow the skier to implement turning movements to the left and to the right.
There have been earlier proposals for providing leg supports, where skiers employ poles connected to the skiers boots and linked by springs at the upper ends of the poles to a harness worn by the skier. Not only is such a construction cumbersome, springs of conventional construction have a variable load resistance as they are stretched or compressed, and consequently give a variable supporting force that is not conducive to good skiing. Additional to this, prior art constructions do not give any effective assistance in putting a skier into a correct skiing posture. Such a construction has the further disadvantage in stopping the skier from bending and flexing the legs when not skiing and consequently a skier cannot board such as ski lifts or chairs with the support mean fitted for use. Consequently the construction must be dismantled to allow a skier to sit and walk normally, and reassembled at the top of a ski slope. The construction involved is inevitably visible, and aesthetically unattractive. Whilst giving support to the skier, such constructions offer nothing by way of assistance in setting the skier in a correct position or posture.
The object of the invention is to provide a body weight support and teaching aid, particularly for use in skiing, that is effective and avoids those disadvantages mentioned above and provides still further advantages.
According to the present invention a body weight support comprises a first (upper) member adapted for location against the thigh area of the leg, a second (lower) member adapted for location against the calf area of the leg, a pivotal connection between the first and second members, the second member being connectable to the boot of a user, load bearing means located on the support to provide a resistance to pivotal movement between the first and second members, and said load bearing means being deactivatable to permit substantially free pivotal movement between the first and second members.
Preferably, the connection between the second member and the boot is a rod fitted to a socket at the lower end of the second member and the socket and the rod may be correspondingly threaded, the rod extending to a snap fit connection on the boot, preferably at the rear of the boot.
With the majority of able bodied skiers, it is desirable to provide two supports, one for each leg, with the upper ends of the supports connected by a strap or other member extending around and below the posterior of the skier.
With a disabled skier, such as those with one leg only, two support members can be provided to locate to either side of the one leg, and a strap or other member extending around the back of the thigh and connecting the upper ends of the two supports.
The upper member may be formed as a generally straight elongate, eg rectangular bar, to locate on the outside of the respective leg of the user, and is provided with a bracket at its upper end for straps to engage around the upper leg or thigh area, in addition to a strap to pass around the posterior of the user. The lower member extends from the pivot with an upper member to a curved and plate-like lower part to locate behind the calf muscle of the respective leg of the user, and a lower fixing strap may be attached to the lower end of the lower support. Desirably, quick release fittings are provided on all of the straps. A quick release fitting may be located on a shin support or protector, attached to the lower member and adapted to overlie the shin of the user.
In one possible form of construction, a load bearing means is attached to the outer surface of the upper support. Preferably, the load bearing means is such that when active it provides a substantially constant force, such as can be provided by a gas strut. Thus, the gas strut may be located in a housing on the upper leg support, there being a cable connecting the gas strut to the lower leg support, said cable passing around a guide at the pivotal connection between the upper and lower members. The cylinder of the gas strut may be attached to a cradle secured to the upper member, below which is a cable attachment member. The cable attachment member has two guide rods extending through corresponding holes in the cradle which extend to a bridging member connected to and extending across the tops of the guide rods. Desirably, in the bridging member is a rotatable stop, able to be rotated from a position where it forms an abutment to engage the top of a piston rod extending from the cylinder, to a position where a through hole in the stop is aligned with the piston rod, to allow the passage of the piston rod therethrough. With the rotatable stop in a position where its hole is aligned with the piston rod of the gas strut, the bridging member could slide down the guide rods, and with the piston rod engaging the hole, the rotatable member could not be rotated to activate the support means. Therefore, between the cradle and the bridging member, the guide rods may have surrounding coil return springs to hold the bridging member in an elevated position with the rotatable member clear of the top of the piston rod. An alternate possibility is to have a coil spring surrounding the or each gas strut, and bearing against the cradle and the bridging member.
When the support means is activated, the user is immediately faced with the full force of the or each gas strut as he or she first settles into a skiing position. It is therefore preferred to have the or each gas strut slidably mounted in the cradle, and for a coil spring to be provided below the or each gas strut. As a result, there is a cushion effect provided by the compressing of the coil spring below the gas strut, and when the spring is compressed, the gas struts then come into play.
Whilst the presence of coil springs can provide a useful supplement to the load bearing characteristics of the or each gas strut, they should be of a rating such that with the load bearing means deactivated, they do not provide a major resistance to the freedom of the upper and lower members to pivot, and hence allow the skier to walk and sit relatively normally without the need to remove the body support means.
Simple and unobtrusive lever means may be provided to rotate the stop means.
Thus, with two body weight support means attached to the outside of each leg and interconnected by the strap at their upper ends, with, if the skier requires it, suitable padding between the legs and the supports, the skiers overtrousers can be put on, totalling hiding the support from view, and yet easily activated by the movement of the lever on the rotatable s
Banks Derris H.
Fernstrom Kurt
Trexler, Bushnell Giangiorgi, Blackstone & Marr, Ltd.
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