JP3186719U - Locking bolt for lower limb orthosis for walking - Google Patents

Abstract

An object of the present invention is to provide a lower limb orthosis for walking that can be easily prevented from loosening from the front side even when the back side of the fixed member is narrow, and that the fixed member can be easily separated and reused. Providing locking bolts.
A bolt 2 in which a through hole 22b is formed from the head to the tip, a first female screw 31b into which a male screw 22a of the bolt 2 is screwed, and a bottom plate portion 32 are formed on the tip side. And a nut 3 in which a second female screw 32a having a pitch different from that of the first female screw is formed at the center of the bottom plate portion, and a tip of the bolt 2 is inserted into the through-hole from the head of the second plate. A small bolt 1 screwed into the female screw and a more locking bolt are configured. The bolt 2 is inserted from the front surface side of the fixed member and screwed to the first female screw of the nut 3 arranged on the back surface side, and then the small bolt 1 is formed on the bottom plate portion of the nut. Screw onto the female screw.
[Selection] Figure 1

Description

  The present invention relates to an improvement of a locking bolt that prevents loosening with a nut screwed to a bolt when a fixed member made of two members is screwed and fixed with a bolt and nut.

  As a conventional structure for preventing loosening of bolts and nuts, for example, there is an invention described in JP-A-8-247129. The present invention includes a main nut having a bolt, a female screw that is screwed into a male screw portion of the bolt, and a protruding portion in which a male screw having a pitch different from that of the male screw is formed, and the main nut And a sub-nut screwed to the male screw.

  The locking bolt configured in this way is inserted into the hole opened in the fixed member in a state where the fixed members are stacked, and the female screw of the main nut is screwed into the male screw of the inserted bolt. Then, the sub-nut is screwed into the male screw of the main nut and then fixed.

  Due to this structure, the difference in the forward distance of the screw is caused by the difference in pitch between the female screw and male screw of the sub-nut, and the protruding portion is deformed on the screw contact surface, and this elastic action causes the male screw portion of the bolt. And the female screw of the sub-nut are more closely contacted and pressed, and the return stress around the bolt axis increases, and it is possible to prevent loosening without rotating by some vibration.

  As another conventional example, there is an invention described in JP-A-9-53625. According to the present invention, a through-hole whose diameter decreases toward the tip is formed in the bolt and a slit is formed at the tip of the male screw to provide an enlarged piece, and the bolt is inserted into the hole formed in the fixed member. At the same time, with the nut screwed into the male screw of the bolt and the expansion piece protruding from the nut, the tip of the bolt is expanded by press-fitting an insertion rod into the through hole of the bolt. Is.

  Because of this structure, even if intense vibration or impact is continuously applied to the bolts and nuts of the lower limb orthosis for walking, the bolt ends are expanded, so the nuts rotate with respect to the bolts. It is possible to prevent looseness.

JP-A-8-247129 Japanese Patent Laid-Open No. 9-53625

  By the way, in the invention of Japanese Patent Application Laid-Open No. 8-247129, which is Prior Art Document 1, a bolt is inserted from the front surface side of the fixed member, and a main nut is screwed to the front end of the bolt from the back surface side and tightened. Next, the sub-nut is screwed into the protrusion of the main nut, and the sub-nut is engaged and tightened from the back side of the fixed member using a spanner or a wrench, so the back side of the fixed member is narrow. In such a case, there is a problem that the tightening operation becomes very difficult.

  Further, in the invention of Japanese Patent Laid-Open No. 9-53625, which is Prior Art Document 2, after the nut is fastened and fixed to the bolt, an insertion rod is press-fitted into the through hole of the bolt from the bolt head side. It is possible to prevent loosening, and there is no problem that the work of tightening from the back side of the fixed member as in the invention of the above-mentioned prior art document 2 does not occur. When it becomes necessary to remove the insertion rod from the through hole, the bolt and the insertion rod cannot be reused, and the fixed member is frequently removed or replaced. There was a problem that it could not be used for things.

  The present invention is intended to solve the above-described problems, and the object of the present invention is to insert a bolt from the surface side to the fixed member and screw and fix it to the first female screw of the nut. When the back side of the member to be fixed is narrow because it is possible to prevent loosening by inserting a small screw through the through hole from the head of the bolt and screwing it into the second female screw formed at the bottom of the nut. However, since the locking can be prevented only by the work from the surface side, the locking can be easily performed, and even when the fixed member needs to be frequently separated, the screwed state can be easily released and separated, and the loosening It is an object of the present invention to provide a lower limb orthosis using a locking bolt that can be reused.

  The locking bolt used in the lower limb orthosis according to the present invention does not achieve the above-mentioned purpose. The means of claim 1 includes a bolt in which a through hole is formed from the head to the tip, and a male screw of the bolt is screwed. A nut in which a first female screw to be combined is formed, a bottom plate portion is formed on the tip side, and a second female screw having a pitch different from that of the first female screw is formed in the center portion of the bottom plate portion And a small bolt that is inserted from the head of the bolt into the through-hole and has a tip screwed into the second female screw, and the bolt is inserted from the front surface side of the member to be fixed. And a small bolt is screwed and fixed to a second female screw formed on the bottom plate portion of the nut to prevent loosening. .

  According to a second aspect of the present invention, in the first aspect, the shape of the bottom plate portion of the nut is a shape other than a perfect circle shape such as a polygon, an ellipse, or an oval shape, and the bottom plate portion is the fixed member. It is characterized by being fitted in the recess formed in the non-rotating state.

  According to a third aspect of the present invention, in the first aspect, the pitch of the first female screw is 1 mm and the pitch of the second female screw is 0.5 mm.

  In the present invention, as described above, the bolt is inserted from the front surface side of the fixed member and screwed into the first female screw of the nut disposed on the back surface side, and then a small bolt is formed on the bottom plate portion of the nut. By screwing and fixing to the second female screw, it is possible to prevent the nut from rotating with respect to the bolt without causing the nut to rotate with respect to the bolt even when severe vibration or impact by the fixed member is continuously applied. And even when the back side of the fixed member is narrow, it is possible to prevent loosening only by work from the front side, so that it is easy to prevent loosening, and even if the fixed member needs to be separated frequently, screws The stopper can be easily released and separated, and the locking bolt can be reused.

  Furthermore, the shape of the bottom plate part in the nut is made into a shape other than a perfect circle shape such as polygonal, elliptical, oval, etc., and by fitting this bottom plate part into the recess formed in the fixed member, Since the nut itself is prevented from rotating with respect to the bolt, there is an effect that the locking is more reliably performed.

It is sectional drawing of the state which isolate | separated the volt | bolt, nut, and small volt | bolt in the locking bolt of this invention. A small volt | bolt is shown, (a) is a top view, (b) is a front view. A bolt is shown, (a) is a top view, (b) is a front view. A nut is shown, (a) is a top view, (b) is a front view. It is sectional drawing which fixed two to-be-fixed members in the locking state. It is a perspective view in the state where the locking bolt of the present invention was used for a lower limb orthosis for walking. It is sectional drawing of the principal part same as the above.

Hereinafter, an embodiment of the locking bolt according to the present invention will be described with reference to the drawings.
1 is a small bolt whose head 11 is a countersunk screw, and a hole 11a that can be rotated by a hexagonal screwdriver is formed in the head 11. The pitch of the male screw 12 is, for example, 0.5 mm. Is formed.

  2 is a bolt in which the upper surface of the head 21 is formed with a recess 21a into which the back surface of the head of the small bolt 1 enters and a groove 21b in which a flathead screwdriver is engaged, and a back surface is formed with a step portion 21c. The bolt 2 is formed with a through hole 22b through which the male screw 12 of the small bolt 1 can be inserted from the head 21 to the shaft rod 22 on which the male screw 22a is formed. The pitch of the male screw 22a is 1 mm, which is twice that of the male screw 12 of the small bolt 1.

  The spiral direction of the male screw 12 of the small bolt 1 and the male screw 22 of the bolt 2 are formed in the same direction.

  Reference numeral 3 denotes a shaft rod 31 having a recessed step portion 31a into which the step portion 21c of the bolt 2 is fitted, and a shape other than a perfect circle shape such as a polygon, an ellipse, or an oval shape at the tip of the shaft rod 31. The shaft plate 31 is formed with a first female screw 31b that is screwed onto the male screw 22 of the bolt 2, and the bottom plate portion 32 has a bottom plate portion 32 formed on the bottom plate portion 32. A second female screw 32a is formed which communicates with the first female screw 31b and into which the male screw 12 of the small bolt 1 is screwed. In addition, what was formed in the oval shape is shown as a shape of the illustrated bottom plate portion 32.

Next, a description will be given of a procedure for fixing the two fixed members A and B without loosening even when subjected to vibration or impact by the locking bolt of the present invention comprising the above-described members.
A hole B1 into which the bottom plate portion 32 of the nut 3 is inserted is formed on the back surface side of the fixed member B on the back surface side of the two fixed members A, B, and the fixed members A, B The holes A1 and B2 through which the shaft rod 31 of the nut 3 is inserted are opened.

  Then, the shaft rod 31 is inserted so that the bottom plate portion 32 is fitted into the hole B1 from the back side of the fixed member B in a state where the holes A1 and B2 are overlapped with each other. Next, the shaft rod 22 of the bolt 2 is inserted from the surface side of the member A to be fixed, and the male screw 22a and the first female screw 31b of the nut 3 are screwed and fixed.

  Next, when the male screw 12 of the small bolt 1 is inserted into the through hole 22b of the bolt 2, the second female screw 32a of the nut 3 is present at the position where the through hole 22b communicates. When rotating with respect to the second female screw 32a, the male screw 12 is screwed into the second female screw 32a. Then, by tightening the small bolt 1 firmly, the bolt 2 is fixed in a state where the nut 3 is prevented from being loosened.

  In this state, even if vibration or impact force is applied to the fixed members A and B, the screw pitch in which the male screw 22 of the bolt 2 and the first female screw 31b of the nut 3 are screwed together, Since the screw pitch in which the male screw 12 of the bolt 1 and the second female screw 32a of the nut 3 are screwed together is different, the co-rotation in the same direction is restricted, so that the bolt 2 comes out of the nut 3. Will be prevented.

  Next, the locking bolt of the present invention is devised with respect to the rotation shaft that connects the lower limb strut and the sole plate part in the lower limb brace for walking used by people who have difficulty walking due to leg paralysis or dysfunction of the hip joint etc. The case where the bolt and nut according to the above are used will be described with reference to FIGS. The details of the lower limb orthosis for walking are disclosed in Japanese Patent Application Laid-Open No. 2002-291823 filed by the present applicant.

  6 and 7, reference numeral 4 denotes a shoe worn by a person who has difficulty walking, and the support side plate 5 stands up at a position immediately below the hip joints on the left and right sides of the shoe 4. A joint plate portion 5a is formed at the upper end of the support side plate 5 so as to coincide with the rotational axis position of the joint. A coupling member 6b, which is fixed to the lower ends of a pair of support columns 6 provided on the upper portion of a lower limb cuff 6a coupled to the lower limb, can be coupled to the joint plate portion 5a with a locking bolt according to the present invention to swing back and forth. It is a simple joint.

  Through holes 5b and 6c are formed in the coupling member 6b and the joint plate portion 5a, and an oval hole 6d is formed inside the coupling member 6b. Moreover, the recessed part 6e in which the head 21 of the volt | bolt 2 enters is formed in the outer side of the coupling member 6b.

  The shaft rod 31 of the nut 3 is inserted into the through holes 6c and 5b from the hole 6d side formed in this way, and the bottom plate portion 32 is fitted into the hole 6d. Next, the support side plate 5 and the support column 6 are integrated and pivotally supported by being screwed into the first female screw 31b of the nut 3 and tightened from the outside of the coupling member 6b. Further, the small bolt 1 is inserted into the through hole 22b of the bolt 2 and is screwed into the second female screw 32a of the nut 3 to be tightened to prevent loosening.

  If the user continues walking with the lower limb orthosis for walking, the rotating shaft that connects the lower limb strut and the plantar plate part is subjected to a large load in the forward and left and right directions, and with conventional bolts and nuts over time Although loosening has occurred, since the bolt 2 and the small bolt 1 are screwed and fixed to the nut 3 in this way, the loosening between the bolt 2 and the nut 3 does not occur. Unpleasant noises such as squealing noises are eliminated, and the load on the bolts and nuts themselves is reduced, so that metal fatigue does not occur and the bolt and nut replacement period becomes longer.

DESCRIPTION OF SYMBOLS 1 Small bolt 11 Head 12 Male screw 2 Bolt 21 Head 22 Shaft 22b Through-hole 3 Nut 31 Shaft 31b First female screw 32 Bottom plate part 32a Second female screw

Claims (3)

  A bolt in which a through hole is formed from the head to the tip, a first female screw to which a male screw of the bolt is screwed, and a bottom plate portion are formed on the tip side, and a central portion of the bottom plate portion is formed. A nut in which a second female screw having a pitch different from that of the first female screw is formed, and a small screw that is inserted into the through hole from the head of the bolt and is screwed into the second female screw. The bolt is inserted from the front side of the fixed member and screwed into the first female screw of the nut arranged on the back side, and then a small bolt is formed on the bottom plate of the nut. A lower limb orthosis for walking using a loosening bolt, wherein the loosening bolt is fixed by screwing onto a second female screw.   The shape of the bottom plate portion of the nut is a shape other than a perfect circle shape such as a polygon, an ellipse, an oval shape, and the bottom plate portion is fitted in a recess formed in the fixed member in a non-rotating state. A lower limb orthosis for walking using the locking bolt according to claim 1.   The lower limb orthosis for walking using a locking bolt according to claim 1, wherein the pitch of the first female screw is 1 mm and the pitch of the second female screw is 0.5 mm.

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