JP2009287619A - Height adjusting device, and manufacturing method for screw spindle for height adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively manufacture a wide variety of screw spindles of a height adjusting device without using a great of costs in a manufacturing facility. <P>SOLUTION: The height adjusting device is comprised by piercing a base piercing part 7 provided on a lower end of the screw spindle 4 having a male screw part 10 and a base external tool fitting part 6 through a through-hole of a base, and mounting the screw spindle 4 capable of slightly swinging in all directions and capable of rotating around an axis to the base. A shaft like material 14 of a head 13b of a bolt 13 is joined by friction welding, and the screw spindle 4, the base external tool fitting part 6, and the base piercing part 7 are respectively composed by the integrated bolt 13 and shaft like material 14, the head 13b of the bolt 13, and the shaft like material 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a height adjustment device that is directly or indirectly attached to various devices, furniture, display fixtures, and the like and performs height adjustment, and a method of manufacturing a screw shaft of the height adjustment device.

  As one type of such a height adjusting device, there is a height adjusting device called an adjuster bolt or an adjuster pad (such a height adjusting device is described in Non-Patent Document 1, for example). .

  FIGS. 1 and 2 show an example of a conventional height adjusting device 1 of this type, which has a cup-shaped pedestal 3 with an opening 2 facing downward, and a screw shaft 4. A through hole 5 is provided in the center of the pedestal 3. The screw shaft 4 is integrally formed with a hexagonal nut-shaped tool fitting portion 6 by header processing in the vicinity of the lower end of the screw shaft 4. A pedestal insertion portion 7 having a circular cross section is formed.

  An in-pedestal tool fitting member 8 is fixed to the lower end portion of the screw shaft 4. This fixing is performed by inserting the pedestal insertion portion 7 into the through hole 5 formed in the center portion of the pedestal 3 from above, and then the lower end side of the pedestal insertion portion 7 is a center hole 8a of the tool fitting member 8 in the pedestal having a hexagonal nut shape. It is performed by forcibly fitting the in-pedestal tool fitting member 8 to the pedestal insertion portion 7 so as to be press-fitted into the pedestal. The screw shaft 4 is prevented from coming out of the pedestal 3 by the outside pedestal tool fitting portion 6 and the in-pedestal tool fitting member 8.

  The pedestal insertion portion 7 and the through-hole 5 are provided with a clearance, and an appropriate interval is provided between the pedestal tool fitting portion 6 and the pedestal tool fitting member 8, and the screw shaft 4. Is slightly movable in the vertical direction with respect to the pedestal 3, so that the screw shaft 4 can slightly swing (tilt) in any direction with respect to the pedestal 3 as shown by a two-dot chain line in FIG. It is possible to rotate around the axis with respect to the base 3. A recess 9 is provided at the lower end of the pedestal insertion portion 7. A male screw portion 10 is formed on a portion of the screw shaft 4 above the tool base outside the tool fitting portion 6.

  At the time of use, the external thread part 10 of the height adjusting device 1 is screwed into the internal thread part provided on the object to be attached (not shown), and the base 3 is placed on the floor surface, so that the object to be attached is It is installed on the floor surface via the height adjusting device 1 (usually, the male screw portions 10 of one height adjusting device 1 are respectively provided in the female screw portions respectively provided near the four corners of the bottom surface of the attached object. Are screwed together, and the object to be attached is supported on the floor surface by a total of four height adjusting devices 1). Then, a tool such as a spanner (open end wrench) is fitted into the tool mounting portion 6 outside the pedestal, the screw shaft 4 is rotated, and the screwing length of the screw shaft 4 with respect to the female screw portion is changed. Adjust the height of the object.

  When the male screw portion 10 is first screwed into the female screw portion provided on the attached object, a tool such as a box wrench is usually fitted to the in-base tool fitting member 8 or the driver bit is inserted into the recess 9. The screw shaft 4 is rotated by fitting. This is because, in this way, the screwing operation can be performed more efficiently than when the screw shaft 4 is rotated through a tool such as a wrench (open end wrench) or the like on the tool mounting portion 6 outside the base.

  The reason why the screw shaft 4 can slightly swing in all directions with respect to the pedestal 3 is to cope with unevenness and inclination of the floor surface.

  3 and 4 show another example of such a conventional height adjusting device 1. In the case of this conventional example, the in-pedestal tool fitting member 8 is not provided. Instead, by inserting the pedestal insertion portion 7 through the through hole 5 of the pedestal 3 and the washer-like retaining body 11, and then providing a deformable portion 12 projecting radially outward near the lower end portion of the pedestal insertion portion 7, The retaining body 11 is prevented from coming out of the screw shaft 4 in the base 3. The screw shaft 4 can be slightly swung in all directions with respect to the pedestal 3 as in the case of the conventional example of FIGS.

The usage is the same as that of the conventional example. Further, when the male screw portion 10 is first screwed into the female screw portion provided on the attached object, the screw bit 4 is usually rotated by fitting the driver bit into the recess 9.
Catalog “2008 Orange Book, Construction Site”, TRUSCO NAKAYAMA CORPORATION, December 2007, p. 899

  In the case of the conventional device shown in FIGS. 1 to 4, when the hexagonal nut-shaped tool fitting portion 6 is header-processed on the screw shaft 4, the pedestal insertion portion 7 projects below the tool tool fitting portion 6. Therefore, a special device and a mold different from the bolt head header processing in the normal bolt manufacturing process are required. On the other hand, in this type of height adjusting device 1, there are various demands for the length of the screw shaft 4, the diameter and pitch of the male screw portion 10, and the like.

  Therefore, in the past, there has been a problem that the manufacturing equipment is expensive in order to sufficiently meet various demands for the length of the screw shaft 4, the diameter and pitch of the male screw portion 10, and the like.

  Moreover, in the said conventional apparatus, since the tool mounting part 6 outside a base is integrally processed to the screw axis | shaft 4 by header-processing (forging process), depending on the diameter of the raw material of the screw axis | shaft 4, the base insertion part 7 of the base insertion part 7 is processed. As a result of restricting the diameter (thickness), the diameter of the base insertion portion 7 cannot be freely selected with respect to the diameter of the male screw portion 10 of the screw shaft 4. Therefore, in the case of the conventional apparatus as shown in FIGS. 1 and 2, the larger the diameter of the male threaded portion 10 of the screw shaft 4, the larger the diameter of the pedestal insertion portion 7 and the size of the in-pedestal tool fitting member 8, When the diameter of the male threaded portion 10 of the screw shaft 4 is changed, there is a problem that it is necessary to use a tool of a different size for the tool fitted to the in-base tool fitting member 8.

  Further, in the height adjusting device that does not have the in-pedestal tool fitting member 8 as in the conventional device of FIGS. 3 and 4, when the male screw portion 10 is first screwed into the female screw portion provided on the attached object. Since the screw shaft 4 must be rotated exclusively by fitting the driver bit into the recess 9, there is a problem that the screw shaft 4 may not be rotated with a sufficiently large torque.

  Further, the conventional apparatus has a problem that the strength of the through hole 5 portion of the base 3 is small.

  The present invention has been made in view of such a conventional situation, and one of the objects of the present invention is to manufacture a wide variety of screw shafts at a low cost without incurring a great deal of cost on manufacturing equipment. An object of the present invention is to provide a height adjusting device and a method of manufacturing a screw shaft of the height adjusting device.

  Another object of the present invention is that, even if the diameter of the male thread portion of the screw shaft is changed, the size of the tool fitting portion in the pedestal having a non-circular cross section formed in the pedestal insertion portion is the same. Height adjustment device capable of rotating a screw shaft by fitting a common (same size) tool to a tool fitting portion in a pedestal even with respect to height adjustment devices having different diameters of male thread portions Another object of the present invention is to provide a method for manufacturing the screw shaft of the height adjusting device.

  Another object of the present invention is to provide a height adjusting device capable of increasing the strength of the through hole portion of the pedestal.

  Still other objects of the present invention will become apparent from the following description.

The height adjusting device according to the present invention is:
A pedestal, a through hole opened in the pedestal, a screw shaft, and a pedestal provided in the vicinity of the lower end of the screw shaft and projecting in a radial shape in a hook shape so as not to pass through the through hole An external tool fitting portion; and a male screw portion provided on a peripheral surface of a portion of the screw shaft above the pedestal outside tool fitting portion, wherein the screw shaft is the screw shaft of the screw shaft. With the pedestal insertion part composed of the part below the tool-fitting part outside the pedestal inserted through the through hole, the axial direction can be up and down, and the pedestal can swing slightly in all directions And is attached to the pedestal so as to be rotatable about an axis with respect to the pedestal, and the male threaded portion is screwed into a female threaded portion provided on an attached object. The outer tool fitting part fits a tool for rotating the screw shaft In the height adjusting device being Noh,
The screw shaft includes a bolt having a shaft portion and a head portion provided at one end of the shaft portion, and the head portion of the bolt is coaxial with the shaft portion of the bolt and opposite to the shaft portion. A short shaft-like material joined by friction welding so as to extend in the direction, and the head-side tool fitting portion is constituted by the head portion of the bolt, and the pedestal insertion portion is constituted by the shaft-like material. It is configured.

Moreover, the manufacturing method of the screw shaft of the height adjusting device according to the present invention is as follows:
A pedestal, a through hole opened in the pedestal, a screw shaft, and a pedestal provided in the vicinity of the lower end of the screw shaft and projecting in a radial shape in a hook shape so as not to pass through the through hole An external tool fitting portion; and a male screw portion provided on a peripheral surface of a portion of the screw shaft above the pedestal outside tool fitting portion, wherein the screw shaft is the screw shaft of the screw shaft. With the pedestal insertion part composed of the part below the tool-fitting part outside the pedestal inserted through the through hole, the axial direction can be up and down and slightly swing in all directions with respect to the pedestal And is attached to the pedestal so as to be rotatable about an axis with respect to the pedestal, and the male threaded portion is screwed into a female threaded portion provided on an attached object. The outer tool fitting part fits a tool for rotating the screw shaft In the method for manufacturing the screw shaft of the height adjusting device being Noh,
Providing a bolt having a shaft and a head provided at one end of the shaft;
Providing a short shaft material;
The shaft-shaped member is joined to the head portion of the bolt by friction welding so as to be coaxial with the shaft portion and extend in a direction opposite to the shaft portion. The screw shaft is formed, the head portion of the bolt is used to form the pedestal tool fitting portion, and the shaft-like material is used to form the pedestal insertion portion.

  In the present invention, as the bolt, a general-purpose or off-the-shelf inexpensive bolt can be used, and even if a dedicated bolt is manufactured in particular, it can be formed in the same shape as a normal bolt, so it is manufactured inexpensively. be able to. Further, in order to manufacture screw shafts having various lengths, the diameters and pitches of the external thread portions, it is only necessary to prepare bolts having various lengths, the diameters and the pitches of the external thread portions, and the like. Therefore, various types of screw shafts can be manufactured at low cost without incurring significant costs on manufacturing equipment (in other words, low-cost, high-mix low-volume production can be performed).

  Further, the base insertion portion and other portions of the screw shaft can be made of different metals.

  In addition, when at least a part of the pedestal insertion part has a non-circular cross-sectional shape and this non-circular cross-sectional part is a pedestal tool fitting part, the thickness of the pedestal insertion part with respect to the diameter of the male screw part of the screw shaft As a result, the size of the tool fitting part in the pedestal can be selected freely, so that the size of the tool fitting part in the pedestal is the same even if the diameter of the male screw part of the screw shaft changes, and the diameter of the male screw part of the screw shaft However, even for different height adjustment devices, a common (same size) tool can be fitted into the in-pedestal tool fitting portion so that the screw shaft can be rotated. Thereby, for example, producers of various devices and the like can improve the workability of the work of attaching the height adjusting devices having different diameters of the male screw portions of the screw shafts to the attachments such as various devices.

The height adjusting device of the present invention and the method of manufacturing the screw shaft of the height adjusting device are as follows:
(A) A wide variety of screw shafts can be manufactured at low cost without incurring significant costs on manufacturing equipment.
(B) The base insertion part and other parts of the screw shaft can be made of different metals.
(C) A common (same size) tool can be fitted to the tool fitting part in the pedestal so that the screw shaft can be rotated even for height adjustment devices with different diameters of the male screw part of the screw shaft. can do,
It is possible to obtain excellent effects such as.

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

  5 to 10 show Example 1 of the present invention. Among these, FIG. 5 (a)-(e) has shown the manufacturing process of the screw shaft 4 in a present Example.

  First, as shown in FIG. 5A, a hexagonal bolt 13 made of metal such as steel having a shaft portion 13a and a head portion 13b having a hexagonal cross section provided at one end of the shaft portion 13a, and the bolt A shaft member 14 made of a metal such as steel having a hexagonal cross section is prepared on the entire portion shorter than the shaft portion 13a, and these are set in a friction welding machine (not shown). The bolt 13 has a length corresponding to the length of the screw shaft 4 to be manufactured, the diameter and pitch of the male screw portion 10, the diameter and pitch of the male screw portion 13c, and the like.

  Next, as shown in FIG. 5B, with the friction welding machine, the shaft 13 is fixed while the bolt 13 and the shaft 14 are coaxial, while the bolt 13 is rotated while the head 13 is rotated. 13b and one end of the shaft-shaped material 14 are brought into contact with each other and pressurized in the axial direction, frictional heat is generated, the bolt 13 and the shaft-shaped material 14 are friction-welded, and the shaft-shaped material 14 is attached to the head 13b of the bolt 13. These are joined so as to be coaxial with the shaft portion 13a and extend in the opposite direction to the shaft portion 13a.

  Then, as shown in FIG. 5C, burrs 15 are generated at the joints between the bolts 13 and the shaft-shaped member 14, and the bolts 13 and the shaft-shaped members 14 are projected in a state where these burrs 15 protrude radially outward. Since the bolt 13 and the shaft-like material 14 are rotated around these axes while being set in the friction welding machine, the groove forming portion 16 is cut with the protruding tool 17, As shown in FIG. 5D, the burr 15 is removed, and at the same time, an annular groove 18 extending in the circumferential direction of the shaft-like material 14 is formed in the shaft-like material 14. In this embodiment, at this time, one end (lower end) side of the shaft-like member 14 where no burr 15 is generated is provided with a chamfered portion 19 by slightly cutting a hexagonal corner.

  FIG. 5 (e) shows the screw shaft 4 that has been completed with the burr 15 removed and the annular groove 18 formed. The screw shaft 4 is configured by the integrated bolt 13 and the shaft-shaped member 14, the tool base outside fitting base 6 is configured by the head portion 13 b of the bolt 13, and the male screw of the screw shaft 4 is configured by the male screw portion 13 c of the bolt 13. The part 10 is comprised, and the base insertion part 7 is comprised by the shaft-shaped material 14. FIG. In addition, the said base outside tool fitting part 6 (head 13b of the volt | bolt 13) protrudes in the radial direction in the screw shaft 4, and has a magnitude | size which cannot pass the through-hole 5 of the base 3 mentioned later. is doing. The pedestal insertion portion 7 is formed with an annular groove 18 extending in the circumferential direction of the pedestal insertion portion 7 simultaneously with the removal of the burr 15 as described above. One end portion (lower end portion) side of the shaft-shaped member 14 has a hexagonal cross section provided with the chamfered portion 19, and the in-pedestal tool fitting portion 20 capable of fitting a tool for rotating the screw shaft 4. Is configured. FIG. 6 is an enlarged cross-sectional view taken along the line VI-VI in FIG.

  7 and 8 show the entire height adjusting apparatus 1 in the present embodiment. The base 3 made of metal such as steel has a cup shape with the opening 2 facing downward, and a through hole 5 is provided in the center of the base 3.

  The screw shaft 4 is inserted through the pedestal insertion portion 7 into the through hole 5 from above. A ring 21 having a planar shape as shown in FIG. 9 is attached to the annular groove 18, which is made of a metal wire having a circular cross section, and this ring 21 slightly protrudes in the radial direction from the base insertion portion 7. Thus, the screw shaft 4 is prevented from coming out upward with respect to the base 3.

  The gap between the pedestal insertion portion 7 and the through hole 5 is a clearance, and the distance between the pedestal tool fitting portion 6 and the ring 21 is set to be somewhat larger than the thickness of the pedestal 3. The screw shaft 4 can move slightly in the vertical direction with respect to the pedestal 3, and as a result, the screw shaft 4 slightly swings in all directions with respect to the pedestal 3 as shown by the two-dot chain line in FIG. (Preferably capable of swinging about 1 to 10 degrees with respect to the axial direction of the pedestal 3), and is rotatable about the axis with respect to the pedestal 3.

  In use, as shown in FIG. 10, the locking nut 22 is screwed onto the male threaded portion 10 of the screw shaft 4 and the male threaded portion 10 is attached to the attachment 23 as in the case of the conventional device. The mounting object 23 is placed on the floor surface 25 via the height adjusting device 1 by being screwed into the female screw portion 24 provided on the base plate and placing the pedestal 3 on the floor surface 25. . When the male screw portion 10 is first screwed into the female screw portion 24 provided on the attached object 23, a tool such as a box wrench is usually fitted to the in-pedestal tool fitting portion 20 for work efficiency. Then, the screw shaft 4 is rotated.

  When adjusting the height, a tool such as a spanner (open end wrench) is fitted to the tool mounting portion 6 outside the base, the screw shaft 4 is rotated, and the screw shaft 4 is screwed into the female screw portion 24. The height of the attachment 23 is adjusted by changing the length. When the height adjustment is completed, the adjustment state is locked by tightening the lock nut 22 as shown by the one-dot chain line in FIG.

  In the manufacturing method of the height adjusting device 1 and the screw shaft 4, a general purpose or off-the-shelf, inexpensive bolt 13 can be used as the bolt 13, and even if a dedicated bolt 13 is manufactured in particular, Since it may be the same shape as the bolt 13, it can be manufactured at low cost. Further, in order to manufacture the screw shaft 4 having various lengths, the diameter and pitch of the male screw portion 10, it is only necessary to prepare bolts 13 having various lengths, the diameter and pitch of the male screw portion 13c. Therefore, various types of screw shafts 4 can be manufactured at low cost without incurring a great deal of cost on manufacturing equipment (in other words, low-cost, high-mix low-volume production can be performed).

  Further, when at least a part of the pedestal insertion portion 7 has a cross-sectional noncircular shape and the cross-sectional noncircular portion is the pedestal tool fitting portion 20 as in the present embodiment, the male screw portion 10 of the screw shaft 4 is used. Since the thickness of the pedestal insertion portion 7 and the size of the tool fitting portion 20 in the pedestal can be freely selected with respect to the diameter of the screw, even if the diameter of the male screw portion 10 of the screw shaft 4 changes, the tool fitting portion in the pedestal The size (20) is the same, and a common (same size) tool is fitted to the in-pedestal tool fitting portion 20 even for height adjustment devices having different diameters of the male screw portion 10 of the screw shaft 4. Thus, the screw shaft 4 can be rotated. Thereby, for example, producers of various devices and the like improve the workability of the work of attaching the height adjusting device 1 having different diameters of the male screw portion 6 of the screw shaft 4 to the attachment 23 such as various devices. Can do.

  Further, since the screw shaft 4 can be rotated by the in-pedestal tool fitting portion 20 having a non-circular cross section, the screw shaft 4 can be rotated with a sufficiently large torque.

  Further, in this embodiment, a member having a non-circular cross section (hexagonal) is used as the shaft-like member 14, and a non-circular cross-sectional portion is fitted in a base in which a tool for rotating the screw shaft 4 can be fitted. Since it is set as the tool fitting part 20, the tool fitting part 20 in a base can be manufactured further cheaply.

  11 and 12 show the height adjusting apparatus 1 according to the second embodiment of the present invention. In this embodiment, a washer-like retaining body 11 made of a metal such as steel is interposed between the base 3 and the ring 21 in a state of being penetrated by the base insertion part 7 of the screw shaft 4. . As a result, the screw shaft 4 is prevented from slipping upward with respect to the base 3 by the ring 21 and the retaining member 11. The retaining body 11 is movable in the axial direction with respect to the base insertion portion 7.

  In the present embodiment, the annular groove 18 for attaching the ring 21 is provided in the hexagonal section of the pedestal insertion portion 7, and the portion below the annular groove 18 is the in-pedestal tool fitting portion 20. It is said that. FIG. 13 shows a process of creating the annular groove 18 in this embodiment. As shown in FIGS. 13A and 13B, the burr 15 generated at the joint between the bolt 13 and the shaft-like material 14 by friction welding. When the cutting tool 17 is cut, the annular groove 18 is formed in the portion where the burr 15 is not generated, so that the annular groove 18 can be provided in the hexagonal section of the pedestal insertion portion 7. However, the annular groove 18 for attaching the ring 21 may be provided on the outer side of the hexagonal portion in the cross section of the base insertion portion 7 as in the first embodiment.

  Other configurations are the same as those of the first embodiment. Also in the present embodiment, it is possible to obtain the same effects as those of the first embodiment.

  14 and 15 show the height adjusting device 1 according to Embodiment 3 of the present invention. In the present embodiment, the through hole 5 of the pedestal 3 is subjected to burring so that the hole flange portion 5a protrudes downward. Other configurations are the same as those of the first embodiment.

  In this embodiment, since the through hole 5 is burring processed, the strength of the through hole 5 portion of the base 3 can be increased.

  16 and 17 show the height adjusting device 1 according to the fourth embodiment of the present invention. In this embodiment, the through hole 5 of the pedestal 3 is burringed so that the hole flange portion 5a protrudes upward, and the upper end of the hole flange portion 5a slides on the lower end surface of the tool mounting portion 6 outside the pedestal. It comes to be touched. Other configurations are the same as those of the first embodiment.

  In the present embodiment, since the through hole 5 is burring processed, the strength of the through hole 5 portion of the base 3 can be increased as in the case of the third embodiment. Moreover, since the upper end of the hole flange part 5a of the through-hole 5 is slidably contacted with the lower end surface of the tool part 6 outside a base, the contact area of the base 3 and the tool part 6 outside a base is made into the contact area. The rotational resistance of the screw shaft 4 with respect to the pedestal 3 can be reduced.

  FIG. 18 shows the ring 21 in the height adjusting apparatus according to the fifth embodiment of the present invention. This ring 21 is a commercially available flat C-shaped ring. FIGS. 19 and 20 show the entire height adjusting device 1 according to the fifth embodiment of the present invention, in which the ring 21 shown in FIG. 18 is used instead of the ring 21 shown in FIG. Except that the width is narrow, the configuration is the same as that of the first embodiment.

  Also in the present embodiment, it is possible to obtain the same effects as those of the first embodiment. In addition, it cannot be overemphasized that the ring 21 in a present Example can be used also for the height adjustment apparatus 1 of a structure like the said Examples 2-4.

  FIGS. 21-23 has shown the height adjustment apparatus 1 in Example 6 of this invention. In the present embodiment, the upper end side of the pedestal insertion portion 7 of the screw shaft 4 is a small-diameter portion 26 having a circular cross section, while the lower end side of the pedestal insertion portion 7 is a tool in the pedestal having a hexagonal cross section. The in-pedestal tool fitting portion 20 is thicker than the narrow-diameter portion 26. Unlike the first to fifth embodiments, the pedestal insertion portion 7 is not provided with the annular groove 18 for attaching the ring 21. The shape of the pedestal insertion portion 7 is such that when the burr 15 generated at the joint portion between the bolt 13 and the shaft-like material 14 is cut by the friction welding, the annular groove 18 is not formed, and the small diameter portion 26 is formed. Can be obtained by forming only.

  The through hole 5 of the base 3 is subjected to burring so that the hole flange portion 5a protrudes downward. The hole flange portion 5a is tapered so as to be tapered, and in the free state, the inner diameter of the tip end portion of the hole flange portion 5a is the pedestal tool fitting portion 20 (thick portion of the pedestal insertion portion 7). Smaller than. However, as shown in FIGS. 21 and 22, when the in-pedestal tool fitting portion 20 is forcibly pushed into the through hole 5, the tip end portion of the hole flange portion 5a is elastically deformed and enlarged, as shown in FIG. The pedestal tool fitting portion 20 passes through the tip of the hole flange portion 5 a, and the hole flange portion 5 a is positioned around the small diameter portion 26. Then, after passing through the pedestal insertion portion 7, the tip end portion of the hole flange portion 5 a is reduced in diameter, and the pedestal insertion portion 7 is in a state in which it cannot return from the through hole 5 and come out.

  The screw shaft 4 can be slightly swung in any direction with respect to the pedestal 3 and can be rotated around the axis with respect to the pedestal 3. Similar to Example 1.

  In the present embodiment, since the through hole 5 is burring processed, the strength of the through hole 5 portion of the pedestal 3 can be increased as in the case of the third and fourth embodiments. Further, since the screw shaft 4 can be attached to the base 3 without attaching the parts such as the ring 21 to the screw shaft 4, the number of parts and the assembly work process can be reduced.

  In each of the above-described embodiments, the bolt 13 is rotated and the shaft-shaped member 14 is fixed at the time of friction welding, but conversely, the bolt 13 is fixed and the shaft-shaped member 14 is fixed. The bolt 13 and the shaft-like member 14 may be rotated in the opposite directions. Moreover, you may make it act on a joint surface of the volt | bolt 13 and the shaft-shaped material 14 to a reciprocating vibration or a rotational vibration.

  Further, in each of the above embodiments, the bolt 13 and the shaft-shaped member 14 are made of the same type of metal, but they may be made of different kinds of metals. It is good also as a magnetic body.

  Moreover, in each said Example, although the head 13b (outer base tool fitting part 6) of the volt | bolt 13 is made into the hexagonal shape in cross section, in this invention, the head of a bolt (outer base tool fitting) Part) may have a non-circular cross section other than a hexagon such as a quadrangle.

  Moreover, in each said Example, although the tool fitting part 20 in a base is made into the cross-sectional hexagonal shape, in this invention, a cross-sectional noncircle other than hexagons, such as a rectangle, is set as the tool fitting part in a base. It is good also as a shape.

  Further, in each of the above-described embodiments, the attachment 23 itself is an object to be finally adjusted in height, and the female screw provided on the object (attachment 23) to be finally adjusted in height. Although the case where the male screw portion 10 of the screw shaft 4 of the height adjusting device 1 is directly screwed to the portion 24 is shown, in the height adjusting device of the present invention, an object to be finally adjusted in height and An object to be attached is interposed as an intermediate object with the height adjusting device, and the male thread portion of the screw shaft is screwed into the female screw portion provided on the object to be attached, thereby allowing the intermediate object to be attached. Then, the height of the object may be adjusted indirectly.

  In the present invention, when the ring prevents the screw shaft from coming out of the base, the shape of the ring is not limited to the shape of the ring 21 described in the first to fifth embodiments.

  Moreover, in each said Example, although the recess for fitting a driver bit to the lower end part of the base insertion part 7 is not provided, the lower end of the base insertion part 7 is provided like the conventional apparatus of FIGS. A recess for fitting the driver bit to the portion may be provided.

  As described above, the height adjustment device according to the present invention and the method of manufacturing the screw shaft of the height adjustment device are directly or indirectly attached to various devices, furniture, display fixtures, etc., and height adjustment is performed for height adjustment. It is useful as a manufacturing method of the screw shaft of the device and the height adjusting device.

It is sectional drawing which shows the conventional height adjustment apparatus. It is a bottom view which shows the said conventional height adjustment apparatus. It is sectional drawing which shows the other conventional height adjustment apparatus. It is a bottom view which shows the conventional height adjustment apparatus of FIG. It is a front view which shows the manufacturing process of the screw shaft in Example 1 of this invention. It is an expanded sectional view in the VI-VI line of Drawing 5 (e). It is sectional drawing which shows the height adjustment apparatus in Example 1 of this invention. It is a bottom view which shows the height adjustment apparatus in the said Example 1. FIG. It is a top view which shows the ring in the height adjustment apparatus of the said Example 1. FIG. It is sectional drawing which shows the use condition of the height adjustment apparatus in the said Example 1. FIG. It is sectional drawing which shows the height adjustment apparatus in Example 2 of this invention. It is a bottom view which shows the height adjustment apparatus in the said Example 2. It is a front view which shows the manufacturing process of the screw shaft in the said Example 2. FIG. It is sectional drawing which shows the height adjustment apparatus in Example 3 of this invention. It is a bottom view which shows the height adjustment apparatus in the said Example 3. It is sectional drawing which shows the height adjustment apparatus in Example 4 of this invention. It is a bottom view which shows the height adjustment apparatus in the said Example 4. It is a top view which shows the ring of the height adjustment apparatus in Example 5 of this invention. It is sectional drawing which shows the height adjustment apparatus in Example 5 of this invention. It is a bottom view which shows the height adjustment apparatus in the said Example 5. It is sectional drawing which shows the process of pushing a screw shaft in the through-hole of a base in Example 6 of this invention. It is sectional drawing which shows the height adjustment apparatus of the completion state in the said Example 6. FIG. It is a bottom view which shows the height adjustment apparatus of the completion state in the said Example 6. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Height adjustment apparatus 2 Opening part 3 Base 4 Screw shaft 5 Through hole 5a Hole flange part 6 Base outside tool fitting part 7 Base insertion part 10 Male thread part 11 Retaining body 13 Bolt 13a Shaft part 13b Head part 13c Male thread part 14 Shaft-shaped material 15 Burr 16 Groove forming part 17 Bite 18 Annular groove 20 Tool fitting part in base 21 Ring 23 Attachment object 24 Female thread part 26 Small diameter part

Claims (11)

A pedestal, a through hole opened in the pedestal, a screw shaft, and a pedestal provided in the vicinity of the lower end of the screw shaft and projecting in a radial shape in a hook shape so as not to pass through the through hole An outer tool fitting portion, a male screw portion provided on a peripheral surface of a portion of the screw shaft above the pedestal tool fitting portion, and a lower portion than the pedestal tool fitting portion of the screw shaft. And the screw shaft is inserted in the through hole through the pedestal insertion portion, the axial direction is in the vertical direction, and all directions with respect to the pedestal Attached to the pedestal so as to be rotatable about an axis relative to the pedestal, and the male threaded portion is screwed into a female threaded portion provided on an attachment The tool outside the pedestal fitting portion rotates the screw shaft. In the height adjusting device which is capable fitted because of the tool,
The screw shaft includes a bolt having a shaft portion and a head portion provided at one end of the shaft portion, and the head portion of the bolt is coaxial with the shaft portion of the bolt and opposite to the shaft portion. A short shaft-like material joined by friction welding so as to extend in the direction, and the head-side tool fitting portion is constituted by the head portion of the bolt, and the pedestal insertion portion is constituted by the shaft-like material. Configured height adjustment device.   The height adjusting device according to claim 1, wherein the pedestal has a cup shape whose opening is directed downward.   The at least part of the said base insertion part has made the cross-sectional non-circular shape, and is set as the tool fitting part in a base which can fit the tool for rotating the said screw shaft. Height adjustment device.   An annular groove provided in an intermediate portion in the longitudinal direction of the pedestal insertion portion and extending in the circumferential direction of the pedestal insertion portion; and a ring attached to the annular groove and positioned below the pedestal, The height adjusting device according to any one of claims 1 to 3, wherein the screw shaft is prevented from slipping upward with respect to the pedestal by the ring.   The screw shaft further includes a retaining member interposed between the pedestal and the ring while being penetrated by the pedestal insertion portion, and the screw shaft is located above the pedestal by the ring and the retaining member. 5. The height adjusting device according to claim 4, wherein the height adjusting device is prevented from coming out.   The height adjusting device according to claim 1, wherein the through hole of the pedestal is burring processed.   The hole flange part of the said through hole of the said base is protruded upwards, The upper end of this hole flange part is slidably contacted with the lower end surface of the said base outside tool fitting part. Height adjustment device. The pedestal insertion portion further includes a thick portion provided on the lower end side of the pedestal insertion portion, and a small diameter portion provided on the upper end side from the thick portion and having a circular cross section thinner than the thick portion. ,
The through hole of the pedestal is burring processed, and the hole flange portion of the through hole protrudes downward and is tapered so as to be tapered, and in a free state, the tip of the hole flange portion The inner diameter of the portion is smaller than the thick portion of the pedestal insertion portion, but the thick portion of the pedestal insertion portion is forcibly pushed into the through hole, and the tip end portion of the hole flange portion is elastically deformed and enlarged. By doing so, the thick part of the pedestal insertion part passes through the tip of the hole flange part, and the hole flange part is positioned around the small diameter part. The height according to any one of claims 1 to 3, wherein the pedestal insertion part is set in a state in which the pedestal insertion part cannot be pulled out by returning backward from the through hole because the distal end portion has a reduced diameter after passing through the pedestal insertion part. Adjustment device A pedestal, a through hole opened in the pedestal, a screw shaft, and a pedestal provided in the vicinity of the lower end of the screw shaft and projecting in a radial shape in a hook shape so as not to pass through the through hole An outer tool fitting portion, a male screw portion provided on a peripheral surface of a portion of the screw shaft above the pedestal tool fitting portion, and a lower portion than the pedestal tool fitting portion of the screw shaft. And the screw shaft is inserted in the through hole through the pedestal insertion portion, the axial direction is in the vertical direction, and all directions with respect to the pedestal Attached to the pedestal so as to be rotatable about an axis relative to the pedestal, and the male threaded portion is screwed into a female threaded portion provided on an attachment The tool outside the pedestal fitting portion rotates the screw shaft. In the method for manufacturing the screw shaft because of the tool can be fitted with has been that height adjustment device,
Providing a bolt having a shaft and a head provided at one end of the shaft;
Providing a short shaft material;
The shaft-shaped member is joined to the head portion of the bolt by friction welding so as to be coaxial with the shaft portion and extend in a direction opposite to the shaft portion. A screw for a height adjusting device comprising: a step of forming the screw shaft, forming the outside tool fitting portion by the head portion of the bolt, and forming the pedestal insertion portion by the shaft member. Shaft manufacturing method.   A member having a non-circular cross section is used as the shaft member, and the non-circular cross section is used as an in-pedestal tool fitting portion into which a tool for rotating the screw shaft can be fitted. A method for manufacturing the screw shaft of the height adjusting device according to claim 9. After the shaft-shaped material is joined to the bolt by friction welding, the bolt and the shaft-shaped material are cut by a friction welding operation by cutting the bolt and the shaft-shaped material with a cutting tool while rotating around the axis. 11. The height according to claim 9, further comprising the step of creating an annular groove extending in a circumferential direction of the pedestal insertion portion in the pedestal insertion portion formed of the shaft-like material at the same time as removing burrs generated in the joint portion. Manufacturing method of screw shaft of height adjusting device.

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