JP5923256B2 - Pantograph jack arm, pantograph jack, pantograph jack arm manufacturing method and pantograph jack manufacturing method - Google Patents

Description

The present invention relates to a pantograph jack arm , a pantograph jack arm , a pantograph jack arm manufacturing method, and a pantograph jack manufacturing method used for jacking up a vehicle or the like.

  Conventionally, a pantograph-type jack has, for example, a pair of upper and lower arms assembled in a rhombus shape by a vehicle pedestal, a pedestal, and left and right connecting shafts, and a screw member provided with a handle portion is used as a left and right connecting shaft. The vehicle cradle is moved up and down by rotating a screw member (see, for example, Patent Documents 1 to 3).

JP 2008-13360 A JP 2008-13359 A Japanese Patent Application Laid-Open No. 09-240995

  By the way, in general, the bending rigidity of a member is proportional to the section modulus or the second moment of section of the member, and the tensile or compression rigidity is proportional to the sectional area of the member. Furthermore, the torsional rigidity is proportional to the cube of the circumference of the member cross section and the plate thickness. For this reason, the larger the circumferential length and plate thickness of the member, the larger the cross-sectional area, the section modulus and the second moment of section, and the bending rigidity, tensile or compression rigidity, and torsional rigidity of the tooth portion are improved. Therefore, in the tooth part to which a load is applied in the pantograph jack, when cutting the blank in the state before the arm is bent from the flat steel material, the part corresponding to the tooth part is cut larger than the dimension and larger than the dimension. Thickening processing for crushing the portion (extra width portion) was performed to increase the plate thickness of the tooth portion, and various rigidity of the tooth portion was increased.

  However, recently, in order to reduce the weight of the jack, it has been required to use a steel material with a thin plate thickness, particularly a high-tensile steel plate with a thin plate thickness. When it did, a wrinkle generate | occur | produced in the thickened part, bending etc. generate | occur | produced, the tooth part of the shape as designed was not formed, and the state which the tooth | gear part did not mesh | engage correctly had arisen.

Accordingly, the present invention provides a pantograph jack arm, a pantograph jack , a method for manufacturing a pantograph jack arm, and a pantograph jack arm that can improve the rigidity of the tooth part without increasing the tooth thickness . An object is to provide a manufacturing method .

In order to solve the above-mentioned problems, the arm of the pantograph jack of the present invention is formed in a rhombus shape through bearing holes with respect to the vehicle pedestal, the pedestal, and the left and right connecting shafts, and the rotation of the screw member that passes through the left and right connecting shafts An arm of a pantograph-type jack that bends and stretches to raise and lower the vehicle pedestal relative to the pedestal, a long bottom surface portion, and both side surface portions formed by bending both end portions of the bottom surface portion substantially at right angles, A flange portion formed by bending outward from each side surface portion; and a tooth portion formed at a distal end of the flange portion and meshing with a tooth portion of an opposite arm on the opposite side, each of which includes a plurality of tooth portions has a convex portion and a concave portion, wherein the convex portion and a position of the teeth bead is not provided, the bead only concave portion and a position between the convex portion and the convex portion of the tooth portion provided It is And wherein the door.
Here, it is preferable that the bead of the tooth portion protrudes to the bearing hole side and does not protrude to the opposite side of the bearing hole.
Further, it is preferable that a bead is provided at a rising portion of the tooth portion.
Further, the pantograph jack of the present invention uses the arm of the pantograph jack as described above as a pair of upper arms, as a pair of lower arms, or as a pair of upper and lower arms. It is characterized by.
In addition, the manufacturing method of the arm of the pantograph jack according to the present invention includes a vehicle pedestal, a pedestal, and left and right connecting shafts that are assembled in a rhombus shape through bearing holes, and are bent and stretched by rotation of screw members that pass through the left and right connecting shafts. A pantograph jack arm that raises and lowers the vehicle pedestal relative to the pedestal, a long bottom surface portion, and both side surface portions formed by bending both end portions of the bottom surface portion substantially at right angles; A flange portion formed by bending outward from each side surface portion; and a tooth portion that is formed at a tip of the flange portion and meshes with a tooth portion of an opposite arm that is opposed to each other. It has a plurality of convex portions and concave portions, and the plurality of convex portions and concave portions cut a blank that is the base of the arm from a flat steel material, and become a convex portion of a tooth portion in the blank Without providing a bead on the location, a bead is provided only on the concave portion and a position between the convex portion and the convex portion of the tooth portion, characterized in that provided by the subsequent pressing.
Here, it is preferable that the bead of the tooth portion protrudes to the bearing hole side and does not protrude to the opposite side of the bearing hole.
Further, it is preferable to provide a bead at the rising portion of the tooth portion.
Further, the manufacturing method of the pantograph jack of the present invention, the arm of the pantograph jack manufactured by the method of manufacturing a pantograph jack arm as described above, as an upper pair of arms, or as a pair of lower arms, Alternatively, it is characterized in that a pantograph-type jack is manufactured using the upper pair of arms and the lower pair of arms.

According to the present invention, since the bead is provided in the tooth portion, the circumference is increased by the amount of the bead provided, the cross-sectional area of the tooth portion, the section modulus and the secondary moment of inertia are increased, and the bending rigidity of the tooth portion is increased. Further, since the tensile or compressive rigidity, torsional rigidity, and the like are improved, the rigidity of the tooth part can be improved regardless of the thickening process of the tooth part.
In particular, since the bead is not provided in the convex portion of the tooth portion but only in the concave portion , an accurate tooth portion can be easily formed.

It is a front view of the state where the pantograph jack contracted most. It is a front view of the state where the pantograph type jack is most extended. It is a top view in the state where a pantograph type jack contracted most. It is an AA line sectional view in the state where a pantograph type jack contracted most. It is the front view which looked at the left lower arm from the front. It is the top view which looked at the left lower arm from the upper part. FIG. 6 is an end view taken along line BB of the left lower arm in FIG. 5. It is a figure which shows the other example of the tooth | gear part which provided the bead. It is a figure which shows the further another example of the tooth | gear part which provided the bead. It is a figure which shows the example which provided the bead in the whole flange part. It is a figure which shows the other example of the tooth | gear part which further provided the bead.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of a pantograph jack arm, a pantograph jack arm, a pantograph jack arm manufacturing method, and a pantograph jack manufacturing method according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a front view of the embodiment of the pantograph jack in the most contracted state, FIG. 2 is a front view of the pantograph jack in the most expanded state, and FIG. 3 is a state of the pantograph jack of the most contracted state. 4 is a cross-sectional view taken along line AA in FIG. As shown in FIGS. 1 to 4, in the pantograph jack of the embodiment, connecting pins 19 and 20 are passed through a vehicle cradle 10 for receiving a vehicle and the like and bearing holes formed in upper ends 11 a and 12 a, respectively. A pair of upper arms 11 and 12 whose upper end portions 11a and 12a are rotatably supported by the vehicle cradle 10, and upper end portions 13b and 14b are respectively connected to two connecting shafts (metals) on the lower end portions 11b and 12b of the upper arms 11 and 12 The connecting pins 21 and 22 are passed through bearing holes formed in the pair of lower arms 13 and 14 and the lower arms 13a and 14a of the lower arms 13 and 14, respectively. The pedestal 15 that rotatably supports the lower arms 13 and 14 and the upper arms 11 and 12 and the lower arms 13 and 14 are rotatably connected. And a screw member 18 which is inserted between One of the connecting shaft 16 and 17. The screw member 18 is provided with a handle portion 18a.

  In such a pantograph type jack, when the upper arm 11, 12 and the lower arm 13, 14 are raised by rotating the screw member 18, the vehicle loading platform 10 also rises, and the pantograph type jack shown in FIG. It will be in the state. On the other hand, when the screw member 18 is rotated in the opposite direction, the upper arms 11 and 12 and the lower arms 13 and 14 fall down horizontally, the vehicle cradle 10 is lowered, and finally, as shown in FIG. It becomes a state.

  Next, the features of the upper arms 11 and 12 and the lower arms 13 and 14 that are characteristic portions of the present embodiment will be described in detail. However, since these arms have the same formation method and structural characteristics, the lower arm 13 on the left side of the figure will be described as an example.

  5 to 7 are a front view of the lower arm 13 as seen from the front, a plan view as seen from above, and an end view taken along the line BB, respectively.

  As shown in FIGS. 5 to 7, the lower arm 13 was originally formed by cutting a single metal flat plate, opening a bearing hole, and finally bending it. , And a bottom surface portion 133, and the arm fall prevention portion between the side surface portions 131 and 132 is omitted. As shown in FIG. 6, pilot holes 133 a and 133 b for positioning when the member of the lower arm 13 is cut from a single metal plate and openings 133 c to 133 e for weight reduction are formed in the bottom surface portion 133. ing. In addition, providing these holes 133a-133e is arbitrary.

  Bearing holes 131b and 132b for connecting to the connecting shaft 16 are formed on the connecting shaft 16 side of the side surface portions 131 and 132, that is, the left side in the drawing, while the pedestal 15 side of the side surface portions 131 and 132, that is, the right side in the drawing. Are formed with bearing holes 131a and 132a through which the connecting pin 21 connected to the base 15 is passed. Here, the bearing holes 131a and 132a are formed by forming a pilot hole by punching and then projecting outward by burring from the inside to the outside of the side surfaces 131 and 132 as shown in FIG. . As shown in FIGS. 6 and 7, flange portions 131 c and 132 c that are bent to the outside of the side surface portions 131 and 132 are provided on the upper portions of the side surface portions 131 and 132, respectively. For this reason, since the bending direction of the flange parts 131c and 132c in both side surface parts 131 and 132 and the direction of the burring in the bearing holes 131a and 132a are the same direction, there is an advantage that it is easy to process.

  In the case of this embodiment, the flange portions 131c and 132c are bent outward, and the center of the tooth width in the tooth portions 131d and 132d is located outside the axial centers 131a1 and 132a1 of the bearing holes 131a and 132a. Therefore, when an external force is applied to the tooth portions 131d and 132d, the side surface portions 131 and 132 of the lower arm 13 tend to fall outward. However, since the pedestal 15 presses the side surfaces 131 and 132 of the lower arm 13 from the outside, it is possible to prevent the side surfaces 131 and 132 from falling to the outside. Therefore, when the flange portion is bent inward as in the prior art, the fall prevention portion is provided between the tooth portions 131d and 132d that are most likely to fall due to the most external force on both side surfaces 131 and 132. Then, the fall prevention part between the tooth parts 131d and 132d can be omitted, and the weight of the entire arm and jack can be reduced. However, the fall prevention part may be left between the tooth parts 131d and 132d.

  Further, as shown in FIG. 6, an X tooth portion 131 d and a Y tooth portion 132 d that mesh with the Y tooth portion or the X tooth portion of the right lower arm 14 are provided on the base 15 side of the flange portions 131 c and 132 c, respectively. . Therefore, even if the same lower arm is used for the lower arms 13 and 14 and connected to the pedestal 15, the X tooth part 131d of the lower arm 13 meshes with the Y tooth part of the lower arm 14, and the Y tooth part 132d of the lower arm 13 is It meshes with the X tooth portion of the lower arm 14.

  In the first embodiment, as shown in FIGS. 5 to 7, the concave portions between the convex portions of the X tooth portion 131 d and the Y tooth portion 132 d are respectively provided on the bearing holes 131 a and 132 a side. A plurality of reinforcing beads (also referred to as ribs or concave portions) 131e and 132e that protrude and do not protrude on the opposite side of the bearing holes 131a and 132a are provided. It should be noted that the cross-sectional shape of the recesses of the beads 131e and 132e is a curved shape or a V-groove shape, regardless of the shape, and the bearing holes 131a, What is necessary is just to protrude to the 132a side.

  Therefore, when the vehicle is placed on the vehicle cradle 10 and jacked up, a large load is applied to the teeth 131d and 132d, but the teeth 131d and 132d are provided with beads 131e and 132e, and the rigidity of the teeth 131d and 132d. Therefore, it is possible to withstand a larger load than when the beads 131e and 132e are not provided, and it is possible to prevent the inside from falling down. As a result, it is possible to omit the fall prevention portion between the tooth portions 131d and 132d in this respect. As described above, generally, the bending rigidity of a member is proportional to the section modulus or the moment of inertia of the member, and the tensile or compressive rigidity is proportional to the sectional area of the member. Furthermore, the torsional rigidity is proportional to the cube of the circumference of the member cross section and the plate thickness. Therefore, in the case of the tooth portions 131d and 132d, as shown in FIG. 7, the larger the circumference (h1 + h2) and the plate thickness, the larger the cross-sectional area, and the cross-sectional modulus and the secondary moment of inertia increase. Although the rigidity of the parts 131d and 132d is improved, recently, in order to reduce the weight of the jack, the use of a steel material with a thin plate thickness is required, and the plate thickness cannot be increased. Also, as the plate thickness decreases, if the thickening process is performed to crush the blank part of the blank, the thickened part will be wrinkled, bent, etc., and the tooth part with the designed shape will be formed. Therefore, the state where the tooth portions did not mesh correctly occurred. Therefore, in the present invention, a blank portion is cut from a flat steel material, the blank is cut, and the lengths of the tooth portions 131d and 132d are provided by providing beads 131e and 132e in the concave portions of the tooth portion in the blank width portion of the blank. The length of h1 is lengthened to ensure the rigidity of the tooth portions 131d and 132d without increasing the thickness.

  Here, the reason why the beads 131e and 132e are not provided at the positions corresponding to the concave portions between the convex portions of the tooth portions 131d and 132d, and the beads 131e and 132e are provided at the positions corresponding to the convex portions. This is because when the teeth 131d and 132d are further provided by pressing on the blank, the portions provided with the beads 131e and 132e are reinforced, so that it is difficult to form accurate teeth 131d and 132d. . Therefore, in the embodiment, since the bead is not provided in the convex portion of the tooth portions 131d and 132d but only in the concave portion, the accurate tooth portions 131d and 132d can be easily formed. Further, if the blank portion in the blank is provided only in the concave portion of the tooth portions 131d and 132d where the beads are provided, the tooth width of the concave portion and the convex portion can be made uniform. However, if accurate teeth 131d and 132d can be formed even if beads are provided on the convex portions of the tooth portions 131d and 132d, an extra width portion is secured in the concave portions and convex portions of the tooth portions 131d and 132d in the blank. Of course, not only the concave portion but also the convex portion may be provided with a bead corresponding to the concave portion and the convex portion bead.

  In the present invention, whether or not the tooth portion is thickened is arbitrary, and does not deny thickening. For example, if a blank portion is secured in the concave portion and the convex portion of the tooth portions 131d and 132d in the blank, a bead is provided in the concave portion of the tooth portion, and a bead is not provided in the convex portion, the remainder of the convex portion of the tooth portion is provided. The width portion remains as it is, and the tooth width of the concave portion and the convex portion are not aligned. Therefore, at the stage of a blank in which a bead is provided in the concave portion of the tooth part, or after the blank is bent to form the flange parts 131c, 132c, the tooth parts 131d, 132d, etc., the convex parts of the tooth parts 131d, 132d are formed. Only the extra width portion may be thickened. In this way, the concave portions of the tooth portions 131d and 132d and the tooth widths of the convex portions can be made uniform. In the latter case, it is a thickening process after completion of the teeth 131d and 132d, and since there is a bead already in the concave part, a thin steel material is used, and a thickening process is performed on the remaining width part of the convex part. However, the shape of the tooth portions 131d and 132d is not so badly affected, and the strength can be further improved as compared with the case where the thickening process is not performed on the remaining width portion of the convex portion.

  In particular, the beads 131e and 132e protrude downward on the bearing holes 131a and 132a, that is, in FIG. 7, and do not protrude on the opposite side of the bearing holes 131a, that is, in FIG. Therefore, even when the Y tooth portion 141c and the X tooth portion 142c of the lower arm 14 are engaged with each other, the convex (crest) portions are not engaged with each other, and the concave (dent) portions are engaged with each other. The teeth do not slip sideways due to the meshing. As a result, when the vehicle is placed on the vehicle cradle 10 and jacked up, even if a large load is applied to the X tooth portion 131d and the Y tooth portion 132d, side slip occurs at the meshing portion while being reinforced by the beads 131e and 132e. Therefore, the vehicle can be jacked up in a stable state.

  Moreover, in this embodiment, as shown in FIG. 6, the same beads 131f and 132f are provided also in the flat part of the flange parts 131c and 132c. One end of each of the beads 131f and 132f, that is, the upper right end in FIG. 6 reaches the upper part of each of the bearing holes 131a and 132a, and the other end, that is, the left end in the figure extends to the pilot hole 133b of the bottom surface portion 133. Therefore, by the beads 131f and 132f, the flat flange portions 131c and 132c in the vicinity of the bearing holes 131a and 132a to which a load such as a compressive force or a bending stress is applied when jacking up, or the bottom surface portion around the pilot hole 133b in which the strength is reduced. 133 can be effectively reinforced. In addition, since the beads 131e and 132e and the beads 131f and 132f are located on the left and right sides of the bearing holes 131a and 132a, effective reinforcement can be performed in this respect.

  In the description of the above embodiment, flange portions 131c and 132c are provided by bending the upper end portions of both side surfaces of the lower arms 13 and 14 outward, and the teeth 131d and 132d at the tips of the flange portions 131c and 132c are respectively provided. The beads 131e and 132e that protrude toward the bearing holes 131a and 132a and do not protrude toward the opposite side of the bearing hole 131a have been described. However, the present invention is not limited thereto, and the lower arm 13 ′ illustrated in FIG. Beads 131e ′ and 132e ′ shown in FIG. 8 may be provided which do not protrude toward the bearing holes 131a and 132a but protrude toward the opposite side of the bearing holes 131a. Further, like the lower arm 13 ″ shown in FIG. 9, the upper end portions of both side surfaces of the lower arm 13 are bent inward to form a flange portion, and a tooth portion 131d in which beads 131e and 132e are formed at the end of the flange portion. Of course, it is possible to provide ", 132d". Of course, it is also possible to provide beads 131e ', 132e' in opposite directions on the teeth 131d ", 132d". Moreover, as shown in FIG. Further, the beads 131f and 132f may be provided not only on the teeth 131d and 132d of the flange ends 131c and 132c but also on the entire flanges 131c and 132c, and the rigidity of the arms of the teeth 131d and 132d is further increased. Therefore, the beads 13 are also formed at the rising portions of the tooth portions 131d and 132d as in the lower arm 13 ″ ′ shown in FIG. g, may of course be so even longer length of h2 well h1 provided 132g. Further, the present invention has been described so that beads are provided on the tooth portions of both the upper arms 11 and 12 on the upper side and the lower arms 13 and 14 on the lower side as in the above embodiment. Only the lower arms 13 and 14 or only the upper arms 11 and 12 on the upper side may be configured similarly. In particular, since the upper arms 11 and 12 are accommodated in the lower arms 13 and 14 when the jack is folded, the arm width is narrow and it is difficult to form the fall prevention portion. It is effective to adopt the structure of the present invention for 12. Further, when beads are provided in the X tooth portion and the Y tooth portion that mesh with each other, the bead of one tooth portion of the X tooth portion and the Y tooth portion has a shape protruding to the bearing hole side, while the other tooth portion If the bead that protrudes to the opposite side of the bearing hole is engaged with the X tooth portion and the Y tooth portion, the concave portion and the convex portion are fitted to each other. The side slip can be prevented as compared with the case where the teeth are engaged, and the teeth can be more reliably engaged with each other while reinforcing the teeth.

DESCRIPTION OF SYMBOLS 10 ... Vehicle stand, 11, 12 ... Upper arm, 13, 13 ', 13 ", 13"', 14 ... Lower arm, 15 ... Base, 16, 17 ... Connection shaft, 18 ... Screw member, 19, 20, 21, 22 ... connecting pin, 131, 132 ... both sides, 131a, 132a, 131a ', 132a', 131a ", 132a", 131b, 132b ... bearing hole, 131c, 132c ... flange, 131d ... X tooth, 132d ... Y tooth part, 131e, 132e, 131f, 132f, 131g, 132g ... beads, 133 ... bottom face part

Claims (8)

A pantograph-type jack that is assembled in a rhombus shape with bearing holes on the vehicle pedestal, pedestal, and left and right connecting shafts, and is bent and stretched by the rotation of screw members that pass through the left and right connecting shafts to raise and lower the vehicle pedestal relative to the pedestal. Arm,
A long bottom surface,
Both side surface portions formed by bending both ends of the bottom surface portion at a substantially right angle;
A flange portion formed by bending outward from each side surface portion;
A tooth portion that is formed at a tip of the flange portion and meshes with a tooth portion of an opposite arm on the opposite side;
The teeth each have a plurality of convex portions and concave portions, the bead can not be provided at a position that is convex portion of the tooth portion, the concave portion between the convex portion and the convex portion of the tooth portion Pantograph jack arm, characterized in that a bead is provided only at the position. In the arm of the pantograph jack according to claim 1,
The bead of the tooth portion protrudes to the bearing hole side and does not protrude to the opposite side of the bearing hole.
A pantograph jack arm. In the arm of the pantograph jack according to claim 1 or 2,
Beads are also provided in the rising part of the tooth part,
A pantograph jack arm.   The arm of the pantograph jack according to any one of claims 1 to 3 is used as an upper pair of arms, as a pair of lower arms, or as a pair of upper arms and a pair of lower arms. A pantograph-type jack characterized by its use. A pantograph-type jack that is assembled in a rhombus shape with bearing holes on the vehicle pedestal, pedestal, and left and right connecting shafts, and is bent and stretched by the rotation of screw members that pass through the left and right connecting shafts to raise and lower the vehicle pedestal relative to the pedestal. A method for manufacturing an arm, comprising:
A long bottom surface,
Both side surface portions formed by bending both ends of the bottom surface portion at a substantially right angle;
A flange portion formed by bending outward from each side surface portion;
A tooth portion that is formed at a tip of the flange portion and meshes with a tooth portion of an opposite arm on the opposite side;
Each of the tooth portions has a plurality of convex portions and concave portions, and the plurality of convex portions and concave portions cut a blank that is the base of the arm from a flat steel material, and become convex portions of the tooth portion in the blank. A method for manufacturing an arm of a pantograph-type jack characterized in that a bead is not provided at a position, but a bead is provided only at a position corresponding to a concave portion between a convex portion and a convex portion of a tooth portion, and then provided by pressing. . In the manufacturing method of the arm of the pantograph type jack according to claim 5,
The bead of the tooth portion protrudes to the bearing hole side and does not protrude to the opposite side of the bearing hole.
A method of manufacturing an arm of a pantograph jack. In the manufacturing method of the arm of the pantograph type jack according to claim 5 or 6, Provide a bead on the rising part of the tooth part,
A method of manufacturing an arm of a pantograph jack. The arm of the pantograph jack manufactured by the method of manufacturing the arm of the pantograph jack according to any one of claims 5 to 7, as an upper pair of arms, or as a pair of lower arms, Alternatively, a pantograph-type jack is manufactured by using the pantograph-type jack as an upper pair of arms and a lower pair of arms.

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