DE1932569A1 - Artificial foot with ankle joint - Google Patents

Abstract

The arrangement comprises an ankle portion, a foot portion, an elastic rolling body between the lower ankle surface and the foot and a connection between foot and ankle. The upper surface of the joint is complementary to the lower surface of the ankle. The rolling body spaced from this region supports the lower surface of the ankle when walking. Specif., the support body is hard felt block (or polyurethane) and the joint is cellular vulculane.

Description

PATENT Attorney DIPL.-ING. ULRICH KlNKELIN 7032 Sindelfingen - Auf dem Goldberg- Weimarer Str. 32/34 - Telephone 07031/86501

May 28, 1969

10 471

Georg Greissinger

7 Stuttgart-Vaihingen, Fauststrasse 3

ARTIFICIAL FOOT

The invention relates to an artificial foot with ankle joint, in which the down facing end face of an ankle part seen in side view at least one radius follows, with an elastic roll-off body provided between the end face and the foot part and with a connection device between the foot part and the ankle part.

Such an artificial foot is described in DBPS 1 173 612 and has become in the Practice very well established.

In recent times, attempts have been made to address the static and, in particular, the dynamic moments that occur while walking. They tried to make an artificial one To create a foot that can be rolled off better and that gives the wearer a larger one Gives security. Kinking of the foot should be avoided. The solution was

a complicated hydraulic piston system is given here. (Orthopädie-Technik issue 12, p. 339 ff.) 0098 82/1116

10 471 -2- May 28, 196?

The object of the invention is to provide an artificial foot that both when putting on with the heel as well as when rolling and finally when standing up the toes do not give rise to uncertainty and use components that avoid complicated mechanisms and are also much lighter than the known ones ) artificial feet.

According to the invention this object is achieved in that the rolling body on his upwardly facing surface is designed complementary to the front panel that the Abroll! Body ends at a distance from the foremost area of the end face and that this Area approximately in continuation of the surface of the roller body is opposite a body, which supports the face as the movement progresses.

k It is advantageous if the hard body is made of block felt and if the roll-off body is made of cellular

is vulkulan. This block felt is able to partially support this when the ankle is bent forward and thus to avoid that the rolling element is overstrained in compression. At the same time , however, the block felt is not so hard that it brings shocks or even makes noises. '

It is favorable if the roller body is at a distance from the lowermost area of the end face ends and there is a free space under this area in the normal state. Here too-

this improves the Abro !! movement and improves the suspension and shape properties of the Unwinding body used favorably *

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10 471 -3- ' ^wv io -. ^ H> 69

It is beneficial * if the rolling element is harder, the greater the weight of the foot the person carrying it. One can thereby adjust the function of the foot to the weight of the person adjust, because people of the same shoe size can often have very different weights be. ·

It is useful if the rolling body is about two-thirds to three-quarters of the way End face length extends. Such a construction has proven itself very well in practice.

It is advantageous if the face is machined according to a single radius. One then avoids the copy milling that has been common since then, the ankle file can be used in this Saw off the area with a band saw and get an uncomplicated, in-your-own-creation very manageable frontal area.

It is favorable if the foot part has an upward-facing flat surface on which in front the hard body and on the back a flat body is attached and if in the Space between the two bodies of the rolling body is provided .. You can then fall back on foot parts known per se during production and only need them to process very little, so that there is a cost saving.

It is beneficial if the rolling body has a through recess for the connecting device which widens conically in its upper region and if the between the upper edge of the through recess and the outer upper edge of the Unrolling body located ring area is flat seen from the side. Through this

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if the rolling element is given suspension properties that are favorable for its function, it creates Space for the connecting device and receives even surface pressures the ring area.

It is useful if the through hole is circular-cylindrical in its lower area is and if a bearing plate protrudes in this area, which is firmly connected to the foot part is. While the above-mentioned hard body and the flat body are the rolling elements prevents it from dodging in the longitudinal direction of the foot, prevents the bearing plate including through-hole so that the rolling element can slip sideways.

It is advantageous if the rolling body in its rear area a preferably after has an open groove at the top. This also makes the heel strike softer and the P roll function more perfect.

It is beneficial if the normal position between the upper surface of the hard body and the opposite area of the end face of the ankle part a smaller one Distance is provided. When the ankle part is bent forward, the hard part then kicks in Body initially not in function and then later more and more takes over the bending force of the ankle part.

It is advantageous if the body is also made of cellular vinylculane. This gives you a significantly improved rolling process with a smooth transition.

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It is favorable if the body is thin relative to the rolling body. is. With a representative Example · the rolling element is 18 mm thick in the middle, while the body is 7 mm thick. Due to the relatively thin body, you get a perfect transition when rolling

from the rolling body to the thin body and achieves a high level of stability.

It is beneficial if the rolling body has cavities in its rear region. For example, this area of the rolling element can be easily drilled through Make the suspension softer.

It is useful if there is one below the end face and behind the rolling element free space and if there the front surface never touches the foot part. This gives the wearer of such a foot a feeling of security when he is carrying the foot touches the paragraph,.

It is advantageous if the roller body fits into a transverse recess in the foot part can be used. This not only gives it a defined position, but also the transverse recess also limits the expansion possibilities of the Abrolikörpers and influences its suspension properties thus in a favorable manner.

It is advantageous if the Abrol body in the side view of the foot through a through the Longitudinal axis of the ankle section is divided into two roughly equal halves will. Such a measure improves the rolling and standing behavior quite considerably.

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The foot created by the invention not only has a significantly improved function, rather, it is also lighter than the familiar feet, and with a representative one Example of more than 100 grams.

Further advantages and features of the invention emerge from the following description

of a preferred embodiment. In the drawing show:
Fig. 1 is an exploded view of the artificial foot,

2 shows a longitudinal section through the fully assembled foot, in the unloaded state,

3 shows a plan view of a bearing plate,

Fig. 4 is a front view of the connecting device.

5 shows a side view of a two exemplary embodiment,

in the unloaded and loaded state,

6 shows a bottom view of the rolling element of the second exemplary embodiment.

FIG. 7 shows a side view according to FIG. 5 in two different load states.

An artificial foot according to the first exemplary embodiment has an ankle part 11,
whose downwardly facing end face 12 forms a segment of a circle. The ankle part is shaped similarly to the ankle part of a natural foot, is made of wood and
has an approximately oval recess 13 in. which is accessible from the end face 12
. this is the upper part of a connecting device 14 used (Figure 4), which a
Nut piece 16 with threads 17 and an elastic, oval lower piece 19.
The lower piece 19 rests on the base of the recess 13. From below, the lower part is covered with a cover plate 21 on which the heads of two long threaded

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screws 22 rest. These screws traverse the cover plate 21, the lower part 19, the wood of the knuckle part 11 and are in the threads 17 of the nut part 16 screwed tight.

The bottom of the recess 13 has a relatively shallow groove 22 and the lower part 19 has in its top a relatively deep groove 23, which are arranged one above the other are. The cavity thus formed is traversed by an axis 24 in the fork head 26 is attached to the two free ends of the prongs 27 and 28. If the tines 27 and 28 need space for themselves and their movement, there is another in the ankle part 11, recess not shown provided. Due to the construction used, the fork head 26 rotates about its axis 24 in the installed state about - 15 in the Move the drawing plane of FIG. 2. In addition, however, the fork head 24 can also move a few degrees in the plane of the drawing in FIG. 4 relative to the lower piece 19.

Finally, depending on the load condition, the axis 24 in the channel 23 and

move down.

A screw bolt 29 extends from the cross piece of the fork head 26 helped in the recess 13 by tightening the screws 20 so much that the Lower piece 19 widens and is thus clamped in recess 13. In order to the prongs 27 and 28 still retain their freedom of movement are on the lower piece 19 two gates 31 and 32 are provided. In the area 33 there is practically no gate and there the lower piece 19 has almost its original width. "

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With the help of a nut 34 screwed onto the screw bolt 29; the foot control 36 is held. This has a bottom 37 made of elastically resilient material, which has a recess 38 for the nut 34. In the front part of the foot portion "36 is a Vqrfuß is wedge-shaped 39 is provided from Blockfilz. A wood part 41 is also W held in the shape of a natural foot and has an upwardly facing

flat surface 42. In the foremost, i. H. 2 lying furthest to the left Area, a hard body 43 made of block felt is glued on. Its outer surface 44 follows the shape of the natural foot in this area and its upper surface 46 ends in the normal state a few millimeters below the end face 12 in this area. On its rear side 47, the hard body is flat and there falls approximately perpendicularly onto the Area 42 from.

In the heel area, a flat body 47 is glued to the surface 42, which is also consists of block felt, with its outer surface 48 follows the shape of the natural foot, with its surface 49 has a considerable distance from the end face 12 and with its rear surface 51 drops approximately perpendicularly to the surface 42.

In the wooden part 41, a bore 62 of smaller diameter is merged into the surface 42 and a bore 53 of larger diameter and relatively shallow depth. Four blind holes 54 are also drilled into the bottom of the bore 53. In the bore 53 sits a bearing shell 56 (FIG. 3), which has four on its underside Has pins 57 which fit into the blind holes 54. The bearing shell 56 also has

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a through hole 58 for the screw bolt 29. Corresponding to the after The shape of the prongs 27 and 28, rounded at the bottom, has the bearing shell 56 two approximately semicircular Storage areas 59 and 61. Between these two is one on the Basically just as deep, but rectangular recess 62.

As seen from Fig. 2 seen _r is the bearing shell 56 is not completely immersed in the surface 42, but protrudes from this somewhat high, in a circular cylindrical through-bore 63, the diameter of which corresponds exactly to the outer diameter of the bearing shell.

The through hole 63 belongs to a rolling body 64 made of cellular vulcanized material, which fits exactly into the space between the hard body 43 and the flat body 47. On its left and right surfaces 66 it has the shape of the natural foot.

However, since the through-hole 63 in its upper area is in a conical shape

passes over as extension 68, carries by far a smaller part of the surface on which the surface 42 of the wooden part 41 rests. This supporting surface is further reduced by an upwardly open groove 69 in the heel area of the rolling body 64.

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The groove 69 is relatively flat and does not even extend as far as the surface 49 of the flat body 47 down.

As can be seen from FIG. 2, the extension 68 also serves to form part of the lower piece 19, the cover plate 21 to receive the heads of the screws 20.

It has been found that despite significantly different weights and foot

large only with a few types of rolling elements 64. Also cheaper The artificial foot is also very attractive because parts 41, 39 and 37 are also suitable for others Purposes used foot parts can be. The processing of such standard files is only minimal.

While the end face 12 never interferes with the surface 49 of the flat body 47 effectively touches ,, the end face 12 touches the surface 46 of the hard body 43 constantly, when the ankle part 11 according to FIG. 2 about the axis 24 counterclockwise moved far enough. The hard body 43 then results in a stop.

The second exemplary embodiment according to FIGS. 5 and 6 has even better manufacturing; ■■ .;

and above all privacy properties. ^{It is shown on a} scale of Vj 1.

The ankle part 11 is the same here, as is the connecting device 14. The wooden part 41 of the foot part 36 is drawn somewhat higher here in its area opposite the end face 12. Jm Βώ ^ ΦΐΜ f i '£ ^βίηβ Queröusrwrimunjj 71 provided, which covers the entire width of the foot part 41, is flat on its underside

10 471 - 11 - May 28, 1969

this has vertical side walls. The rolling body is in the transverse recess 71 64 used appropriately. It is designed in the same way as the unwinding body of the first one Embodiment, however, has two blind holes 72 in its rear area. So that these blind holes can be accommodated, is in this embodiment the rear area kept a little longer. The blind holes 72 are arranged so that that they do not pierce the recess 69. Here, too, the Tm rear area is one Rounding 73 provided with a smaller radius. The radius of the end face 12 is in one embodiment about 12 cm.

A body 74, which is thin relative to the rolling body 64, is glued onto the wooden part 41. It is separated from the rolling element 64 by a small step 76 and does not normally touch the end face 12.

In Fig. 5, a central axis 77 is shown in dash-dotted lines. It can be seen that this divides the rolling element 64 into two halves of equal size and it can also be seen that the part of the foot part 36 lying to the left of this central axis 77 represents a significantly larger lever than the part lying to the right thereof.

So you have the longer front lever a harder and the shorter one rear lever assigned a softer suspension.

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If you need a larger foot, you use unwinding bodies 64 of the same size, but different degrees of hardness. With larger feet, the body 74 becomes automatic bigger, because the foot part 36 is getting bigger too.

The artificial foot has a much larger contact surface in every load. location. With known feet, the overturning moment is much smaller in dorsal motion as well as in plantal movement. In this regard, FIG. 5 shows, in dashed lines, how far the ankle part 11 the rolling body 64 and the body 74 compresses under vertical load. In Fig. 7 the foot is shown pulled out in the loaded state, as well as dashed in Heel strike and dash-dotted lines disrupt the toe or ball of the foot.

A high strength cellular polyurethane was used as the material for the parts 64 and 74 from Lemförder Kunststoff GmbH & Co. KG, which bears the internal name MH 24-40 and is known under the ZeIlasto trademark.

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Claims (18)

471 28 ". May 1969 PATENT CLAIMS Artificial foot with ankle joint, in which the downward-facing end face of an ankle part follows at least one radius when viewed from the side, with an elastic rolling element provided between the end face and a foot part and with a connecting device between the foot part and ankle part, characterized in that the rolling element is on its upwardly facing surface is designed complementary to the end face, that the Abro11körper $ 54) ends at a distance from the foremost area of the end face (12) and that this area is approximately in continuation of the surface (67) of the Abro11körper (64) a body (43, 74 ) is opposite, which supports the end face (12) as the movement progresses. 2. Artificial foot according to claim 1, characterized in that the Body (12) is hard and made of block felt and that the rolling body (64) , is made of cellular volculane. 3. Artificial foot according to claim 1 or 2, characterized in that the rolling body (64 ) ends at a distance from the rearmost area of the end face (12) and there is a free space under this area in the normal state. 9 8 8 2/1115 10471 4H ~ - ^a * "May 28, 1969 4. Artificial foot according to one or more of the preceding claims, characterized in that the larger the roll body (64), the harder it is is the weight of the person wearing the foot. 5. Artificial foot according to one or more of the preceding claims, characterized in that the rolling body (64) extends approximately along two Third to three quarters of the end face length extends. 6. Artificial foot according to one or more of the preceding claims, characterized in that the end face (12) is machined according to a single radius. 7. Artificial foot according to one or more of the preceding claims, V characterized in that the foot part (36) is an upwardly facing Ebene'F pool (42), on the front of the hard body (43) and on the a flat body (47) is attached at the rear and that the roll-off body (64) is provided in the space between the two bodies. 0098 82/1115 471 ήζ - β - May 28, 1969 8. Artificial foot according to one or more of the preceding claims, characterized in that the rolling body (64) has a through recess (63) for the connecting device (14) which widens conically in its upper region, and that between the upper one Edge of the through recess (63) and the outer upper edge of the rolling element (64) located annular region (67) is flat when viewed from the side. 9. · Artificial foot according to claim 8, characterized in that the through recess (63) is circular cylindrical in its lower area and that a Lagerpjatfe (56) protrudes into this area, which is fixed to the foot part (36). connected is. 10. Artificial foot according to one or more of the preceding claims, characterized in that the rolling body (64) in its rear region has a groove (69) which is preferably open at the top. 11. '" Artificial foot according to one or more of the preceding claims, characterized in that in the normal position between the upper surface of the body (43, 74) and the opposite region of the end face (12) of the ankle part (11) a small distance is provided. 009882/1 1 15 10471 λΚ May 28, 1969 12. Artificial foot according to one or more of the preceding claims, characterized in that the body (74) also consists of a high Polywiethan with strength values is. . ^ 13. Artificial foot according to claim 12, characterized in that the body (74) is thin relative to the rolling element (64). 14. Artificial foot according to claim 12, characterized in that the Rolling body (64) has cavities (72) in its rear region. 15. Artificial foot according to one or more of claims 1 and 12-14, characterized in that there is a free space below the end face (12) and behind the rolling body (64) and that there the end face (12) never touches the foot part (36). 16.. Artificial foot according to claim 1, characterized in that the roll body (64) can be inserted into a transverse recess (71) of the foot part (36) is. . 0 0 9 8 8 2/1115 10 47Τ May 28, 196? 17. Artificial foot according to claim 1, characterized in that the roll-off body (64) in the side view of the foot is divided into two halves of approximately equal size by a plane passing through the longitudinal axis (77) of the ankle part (11). 18. Artificial foot according to one or more of the preceding claims, characterized in that the connecting device (14) is transverse to the Ankle part (11) has axis (24) lying in a groove (23) the connecting device (14) is movably mounted up and down. ORIGINAL INSPECTED 009882/1111