JPS5933366Y2 - prosthetic foot joint - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a foot joint for a prosthetic leg used in the heel portion of the prosthetic leg.

In daily life, there are various movements such as walking indoors with shoes off, walking in high-heeled shoes, and squatting. The thick spacer had to be attached and detached, which was very inconvenient.

Conventionally, in order to solve the above-mentioned inconvenience, as shown in Figs.
A foot joint has been devised in which a spacer having a plurality of steps is brought into sliding contact with a groove provided on the lower end surface of a pawl bearing to adjust the angle between the lower leg pipe and the foot.

However, in the above-mentioned conventional foot joint, when the angle is adjusted by sliding the spacer, the spacer rotates with the pawl bearing relative to the foot, so there is no spacer on the side of the foot for operating the spacer. Must have large windows,
This not only gives the feet an unnatural appearance, but also has the disadvantage that the decorative socks are easily damaged.

The present invention was developed to solve the above-mentioned conventional drawbacks. By sliding the spacer into the groove provided on the top surface of the foot bearing, the spacer remains at a constant position on the foot even when the angle is adjusted. This feature is characterized in that it is configured as follows.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

First, the overall structure will be explained with reference to FIG. 1 showing a conventional example. 1 is a claw bearing having a hollow part 3 for inserting and fixing the lower end of a crural pipe 2; 5 is a shaft 8; The underfoot bearing is connected to the toenail bearing via the underfoot bearing.

Reference numeral 18 denotes a foot portion provided with a hollow portion 19 for accommodating a foot joint, and the underfoot bearing 5 is fixed to the bottom surface of the hollow portion 19 with two bolts 20.

Reference numeral 21 denotes a window provided on the side surface of the leg portion 18 in order to operate the spacer 9.

Next, the configuration of the foot joint of the present invention will be explained with reference to FIGS. 4 to 6.

Reference numeral 1 denotes a pawl bearing having a hollow portion 3, and protruding left and right bearing portions 4 are integrally formed on the lower surface of the pawl bearing 1.

Reference numeral 5 denotes a substantially oval-shaped foot bearing, and a bearing portion 6 is provided at the center of the foot bearing 5.

Reference numeral 7 denotes a bearing member fitted into the bearing portion 6. A shaft 8 is inserted through the bearing member 7 and the bearing portion 4 of the claw bearing 1, and the shaft 8 connects the claw bearing 1 and the foot bearing 5. has been done.

Reference numeral 9 denotes a spacer made of synthetic resin, and one side of the spacer 9 is formed with a stepped portion 9a having a different height, and the other side is formed with a sliding fitting portion 9b having a substantially trapezoidal cross section. The portion 9b is slidably fitted into a groove 10 provided at the tip of the foot bearing 5.

Therefore, when the spacer 9 is slid, the contact position between the stepped portion 9a of the spacer 9 and the lower protrusion 1a of the distal end of the claw bearing 1 changes, and the claw bearing 1 is moved around the shaft 8 as a fulcrum. It rotates with respect to the leg bearing 1, and the angle between the leg pipe 2 and the leg section 18 changes.

Reference numeral 11 denotes a ball disposed in a hole 12 provided at the tip of the foot bearing 5, and the ball 11 is always urged by a spring 13 in the direction of coming into contact with the lower surface of the spacer 9 that is slidably fitted in the groove 10. The ball 11 gives a sense of moderation to the sliding operation of the spacer 9.

14 is a cylindrical damper made of an elastic material such as rubber, and the damper 14 has a screw hole 15 provided at the rear end of the claw bearing 1.
and a locking hole 16 provided at the rear end of the foot bearing 5.

Reference numeral 17 denotes an adjustment member screwed into the screw hole 15, and the adjustment member 17 adjusts the elastic force of the damper 14 acting between the upper foot member 1 and the lower foot member 5.

As is clear from the above explanation, the foot joint of the present invention has a structure in which a spacer is slid into the foot bearing to adjust the angle between the lower leg pipe and the foot, so the spacer is always attached to the foot. The spacer is at a constant position relative to the foot, and the position of the spacer relative to the foot does not change as the angle is adjusted, unlike conventional foot joints. can be made smaller,
The practical effect is excellent without causing inconveniences such as the appearance of the foot being unnatural or the decorative socks being easily damaged.

[Brief explanation of drawings]

1 to 3 are views showing a conventional example, in which FIG. 1 is a cross-sectional view showing the foot, FIG. 2 is a side view, and FIG. 3 is a view showing the spacer. Figures 4 to 6 are diagrams showing embodiments of the present invention.
The figure is a sectional view, FIG. 5 is a side view, and FIG. 6 is a bottom view. Explanation of symbols 1...Law bearing, 3...
Hollow part, 4... Bearing part, 5... Foot bearing, 6... Bearing part, 7... Bearing member,
8...Axis, 9...Spacer, 9a...
...Stepped part, 9b... Sliding part, 10...
... Groove, 14 ... Damper 18 ... Foot section, 21 ... Window.

Claims (1)

[Scope of utility model registration request] a claw bearing 1 into which the lower end of the lower leg pipe 2 is inserted and fixed;
A prosthetic leg in which a foot bearing 5 fixed to a foot part 18 is rotatably connected by a shaft 8, and a damper 14 is disposed between the rear end of the nail bearing 1 and the rear end of the foot bearing 5. This foot joint has a spacer 9 in which a stepped portion 9a of different height is formed on one side and a sliding fitting portion 9b on the other side, and the sliding fitting portion 9b of the spacer 9 is placed under the foot. By sliding the spacer 9 into the groove 10 provided on the upper surface of the tip of the bearing 5, the position of the lower protrusion 1a of the pawl bearing 1 that comes into contact with the step 9a is changed, and the lower leg pipe 2 and foot A foot joint for a prosthetic leg, characterized in that it is configured to adjust the angle with the section 18.