TWI746848B - Jack - Google Patents

Abstract

A jack comprises: a base having a slide axis and a slide axis supporting portion; a case installed to said slide axis supporting portion and has case female threads formed on its inner wall; a screw cylinder having male threads formed on its outer wall to be mounted with said female threads formed inside said case, said inner wall of screw cylinder is formed as having a same central axis as the outer wall, and said male threads of said screw cylinder is in reverse with said female threads of said case, and an operation portion; together with a contact portion, it screw mounted with said female threads of said screw cylinder to enable said slide axis to un-rotationally pass through and moves along said slide axis. Thus no matter how long is the distance between the jack and the object to be supported, by the common operation, and said contact portion is kept without rotation, the jack shall contact with the object in short time.

Description

Jack

The present invention relates to a jack, and more specifically, relates to a jack with a screw mechanism for supporting a supporting object such as a workpiece or a table type.

When machining the workpiece, it is necessary to support the workpiece in an appropriate state. When supporting the workpiece, a plurality of telescopic jacks are arranged under the workpiece, and the workpiece is adjusted by adjusting the expansion and contraction amount of the jack to make the workpiece level.

As such a jack, for example, a structure disclosed in Patent Document 1 is known. The jack disclosed in Patent Document 1 consists of a cylindrical body provided with a female threaded portion, a male threaded portion screwed into the female threaded portion, an operating head integrally provided, and a female opening on the operating head The first lifting screw of the threaded part and the second lifting screw provided with a male threaded part screwed into the female thread of the first lifting screw and integrally provided with a support head are formed, and are compared with the cylindrical body The thread pitch of the male thread of the first lifting screw of the female thread is set to be smaller than the pitch of the male thread of the second lifting screw screwed on the female thread of the first lifting screw.

Prior technical literature:

Patent Document 1: Japanese Patent Application Publication No. 2016-169084

According to the structure of the jack disclosed in Patent Document 1, it is convenient in that the level adjustment of the workpiece related to the supporting object becomes easy. However, if the distance from the jack to the supporting surface of the workpiece is longer than the protruding length of the first lifting screw, if the second lifting screw is not set in advance so that the second lifting screw protrudes from the first lifting screw, there will obviously be a pair of supporting heads. The problem that the support surface of the workpiece abuts while rotating causes troublesome operation, or the problem that the time for the support head to contact the workpiece support surface is long.

The present invention was made in order to solve the above-mentioned problems, and its purpose is to provide a short-term contact with a normal telescopic action and without rotating the contact part regardless of the length of the distance from the jack to the support surface of the supporting object. The structure of the jack that supports the supporting surface of the object.

In order to achieve the above-mentioned object, the inventor of the present invention, as a result of intensive research, came up with the following configuration. That is, the present invention is a jack characterized by having: a base having a sliding shaft and a sliding shaft support portion supporting the sliding shaft in a state where the sliding shaft is erected; The shaft support part is provided with a female thread on the inner wall; the screw barrel is cylindrical and screwed into the housing through the male thread provided on the outer wall, and the central axis is set on the inner wall consistent with the outer wall There is a female thread that is opposite to the male thread of the outer wall, and an operating part is provided on the upper end part; and, the abutment part is screwed into the female thread of the screw barrel and the sliding shaft is in a non-rotating state Inserted, it can move along the aforementioned sliding axis.

Thereby, by rotating the screw barrel with respect to the housing assembled on the base on which the sliding shaft is erected, the abutting portion through which the sliding shaft is inserted can be raised without rotating relative to the housing. In addition, by adopting the structure that the lifting (extending) action of the screw barrel from the housing and the lifting (extending) action of the contact portion from the screw barrel are performed at the same time, the contact portion can be shortened to the support surface of the supporting object. time.

It is also preferable that an anti-dropping stopper is installed on the lower end of at least one of the male thread and the abutting portion of the screw barrel.

This prevents the screw barrel or the contact portion from falling off the housing.

It is also preferable that an enlarged diameter portion for abutting is provided at the upper end portion of the abutting portion.

Thereby, the contact pressure when the contact portion abuts on the support surface of the support object can be reduced, the damage of the support object can be prevented, and the elastic support object can also be kept in a state with a small amount of elastic deformation Be supported.

It is also preferable that a stopper is provided on the housing to restrict the rotation of the screw barrel to the housing at any position.

Thereby, unexpected rotation of the screw barrel is prevented, the supporting state of the supporting object can be always maintained in an appropriate state, and damage to the supporting object can be prevented.

It is also preferable that a magnet is arranged in the sliding shaft support part.

Thereby, the jack can be adsorbed to the magnetic body, and the degree of freedom of the installation place of the jack can be improved.

It is also preferable that the aforementioned sliding shaft system forms a polygonal column.

Thereby, the machining of the sliding shaft and the sliding shaft insertion hole for fitting the sliding shaft and the sliding shaft insertion hole of the contact portion can be simplified.

It is also preferable that, on the outer peripheral surface of the sliding shaft, line contact portions that are in line contact with the contact portion are formed at a plurality of locations in the circumferential direction.

Thereby, the frictional resistance between the sliding shaft and the abutting part is reduced, and the sliding shaft can slide smoothly. In addition, the contact portion and the sliding shaft can always be assembled in an appropriate state.

It is also preferable to further include a contact attachment that can be attached to and detached from the aforementioned contact portion.

Thereby, since the supporting object can be supported by the contact attachment that matches the shape of the supporting object, the supporting object can be supported without damaging the supporting object.

According to the structure of the jack in the present invention, regardless of the length of the distance from the jack to the supporting surface of the supporting object, only the simple telescopic action of rotating the screw barrel is performed, so that the contact portion can be protruded and shortened in a non-rotating state Time abuts on the supporting surface of the supporting object.

10‧‧‧Base

12‧‧‧Sliding shaft

12A‧‧‧Male thread

12B‧‧‧Main body

12C‧‧‧Arc shaped protrusion

14‧‧‧Sliding shaft support

14A‧‧‧Female thread

14B‧‧‧Assembly screw hole

14C‧‧‧Female bottom thread

14D‧‧‧Drain hole

20‧‧‧Shell

22‧‧‧Female thread of housing

24‧‧‧Screw hole

26‧‧‧Stopper

26A‧‧‧Knob part

26B‧‧‧Abutting body

28‧‧‧Assembly screw hole

29A‧‧‧Differential part

29B‧‧‧Gobe

30‧‧‧Screw barrel

32‧‧‧Screw barrel male thread

34‧‧‧Operation Department

36‧‧‧Female thread of screw barrel

38‧‧‧Level difference

40‧‧‧Abutment Department

42‧‧‧Slide shaft insertion hole

42A‧‧‧Center hole

42B‧‧‧Outer protruding hole

44‧‧‧Mosaic part

46‧‧‧Abutment male thread

48‧‧‧Expanded part for contact

49‧‧‧Anti-dropping stopper

50‧‧‧C-ring

60‧‧‧Shaft cap

70‧‧‧Accessories for abutment

72‧‧‧Insert part

74‧‧‧Abutting surface

74A‧‧‧V groove

74B‧‧‧Ditch

76‧‧‧Magnet

80‧‧‧Magnet

82‧‧‧Magnet

84‧‧‧Screw hole

86‧‧‧Drainage Ditch

100‧‧‧Jack

N‧‧‧Assembly screw

W1‧‧‧Width of the side of the body

W2‧‧‧The width dimension of the arc part of the arc-shaped protrusion

T‧‧‧Line contact

Figure 1 is a front view of the jack in the first embodiment of the present invention.

Figure 2 is a top view of the jack in the first embodiment of the present invention.

Figure 3 is a side view of the jack in the first embodiment of the present invention.

Figure 4 is a cross-sectional view taken along the line IV-IV shown in Figure 2 of the present invention.

Figure 5 is an exploded assembly view of the jack in the first embodiment of the present invention.

Figure 6 is a cross-sectional view of a state where the screw barrel and abutting portion of the jack protrude in the first embodiment of the present invention.

Figure 7 is an exploded assembly view of the jack in the second embodiment of the present invention.

Fig. 8 is an explanatory cross-sectional view of a state in which the sliding shaft is accommodated in the contact portion of the jack in the second embodiment of the present invention.

Figure 9 is a cross-sectional view of a state where the screw barrel and abutting portion of the jack protrude in the second embodiment of the present invention.

Figure 10 is a front view of a modification of the present invention.

Figure 11 is a top view of the magnet base mounted on the jack in the second embodiment of the present invention.

Figure 12 is a cross-sectional view of XII-XII of the magnet base mounted on the jack in the second embodiment of the present invention.

<First Embodiment>

Hereinafter, the embodiment of the jack in the present invention will be described based on the drawings. As shown in Figures 1 to 6, the jack 100 in this embodiment includes: a base 10 with a sliding shaft 12; a cylindrical housing 20 assembled to the base 10; and cylindrical screws screwed into the housing 20 Tube 30; and the abutment portion 40 screwed into the screw tube 30.

As shown in FIGS. 1, 2, and 4 to 6, the base 10 has a sliding shaft 12 forming a hexagonal column, and a sliding shaft support portion 14 that supports the sliding shaft 12 in a state where it stands upright. The lower part of the sliding shaft 12 is formed with a small diameter portion over a predetermined range, and a male threaded mountain 12A is recessed on the outer peripheral surface of the small diameter portion. The sliding shaft support part 14 is recessed with a female thread 14A for the male thread 12A of the sliding shaft 12 in the central part of its upper surface, and is also provided with an assembly screw hole 14B for assembling the housing 20 on its outer peripheral surface. In addition, the sliding shaft support portion 14 in this embodiment is formed by a magnet.

As shown in Figs. 4 to 6, the housing 20 has a cylindrical shape and the predetermined height range on the upper side is formed to be thicker than other parts. A female housing thread 22 is recessed on the inner wall (inner peripheral surface) of the thick portion. The central axis of the housing female thread 22 of this embodiment is located on the same axis as the central axis of the sliding shaft 12. In addition, a radial screw hole 24 is formed in the thick portion of the housing 20 to penetrate the thick portion. The stopper 26 can be locked in and installed in the screw hole 24 to restrict the screw barrel 30 to the housing 20 at any position. The rotation. The stopper 26 has a knob portion 26A and an abutment body 26B that is screwed into the screw hole 24 and can abut on the outer peripheral surface of the screwed portion of the screw barrel male thread 32 of the screw barrel 30 described later.

On the lower side of the housing 20, an assembly screw hole 28 is formed so as to be aligned with an assembly screw hole 14B provided in the sliding shaft support portion 14. When the housing 20 is viewed in a plan view, the assembly screw holes 14B and the assembly screw holes 28 are arranged at two locations that are 180° opposite sides. The housing 20 and the base 10 are assembled into one body by locking and installing the assembly screws N into the assembly screw holes 28 and the assembly screw holes 14B, respectively.

As shown in Figures 4 to 6, the screw barrel 30 is cylindrical and has a screw barrel male thread 32 provided on the outer wall (outer peripheral surface), and the upper end of the screw barrel male thread 32 is formed with a larger screw barrel male thread 32 is also a large-diameter operation part 34. In addition, the screw barrel 30 has a screw barrel female thread 36 provided on the inner wall (inner peripheral surface) of which the central axis coincides with the outer wall. The screw barrel 30 is screwed into the housing 20 so as to be able to advance and retreat in the axial direction of the screw barrel 30 and the housing 20. The thread direction of the screw barrel male thread 32 and the thread direction of the screw barrel female thread 36 are reversed (reverse thread). Preferably, anti-slip processing is applied to the outer peripheral surface of the operation portion 34 in advance. In this embodiment, roll processing is applied to the outer peripheral surface of the operation part 34.

As shown in FIG. 4 to FIG. 6, the contact portion 40 is formed in a cylindrical shape, and the internal space of the contact portion 40 is formed as a sliding shaft insertion hole 42. In a predetermined range in the height direction (extension direction) of the slide shaft insertion hole 42, a fitting portion 44 to be fitted to the slide shaft 12 is formed. In this way, by forming the fitting portion 44 only in a range of a part of the height direction of the sliding shaft insertion hole 42, the friction between the sliding shaft 12 and the sliding shaft insertion hole 42 can be reduced. In addition, the outer wall (outer peripheral surface) of the contact portion 40 on which the sliding shaft insertion hole 42 is formed is recessed with a contact portion male thread 46 that is screwed into the screw barrel female thread 36 of the screw barrel 30.

The abutting portion 40 is screwed into the screw barrel 30 in a state where the center axis of the abutting portion 40 coincides with the center axis of the screw barrel 30. In addition, the contact portion male thread 46 and the screw barrel male thread 32 form a reverse thread, and the thread arrangement pitch of the contact portion male thread 46 and the thread arrangement pitch of the screw barrel male thread 32 are the same pitch. The contact portion 40 thus formed can move along the sliding shaft 12 in a non-rotating state by rotating the screw barrel 30 with respect to the housing 20.

In addition, in the contact portion 40 in this embodiment, a contact enlarged diameter portion 48 having a larger diameter than the contact portion male thread 46 is provided at the upper end portion of the contact portion male thread 46 in the height direction. By providing such a contact enlarged diameter portion 48, the contact pressure at the contact portion with the support object can be reduced as much as possible, and the elastic deformation of the support object can be suppressed to a minimum. This is convenient. In addition, an anti-dropping stopper 49 is installed at the lower end portion of the male thread 46 of the abutting portion to prevent the abutting portion 40 from falling off the screw barrel 30.

The operation method of the jack 100 in this embodiment will be described. Here, a method of supporting a workpiece (none of which is not shown) as a supporting object on a surface plate of a magnetic body with a jack 100 on a surface plate of a magnetic body will be described here.

The jack 100 is used in a state where the sliding shaft support 14 formed by a magnet is sucked and fixed to a flat plate of a magnetic body. When the user rotates the screw barrel 30 with respect to the housing 20 fixed to the base 10, the screw barrel 30 is stretched in a direction that protrudes (distances) from the upper surface of the housing 20. The contact portion 40 can move along the sliding shaft 12 in a non-rotating state with respect to the sliding shaft 12. In addition, the screw barrel male thread 32 formed on the inner wall of the screw barrel 30 and the contact portion male thread 46 formed on the outer peripheral surface of the contact portion 40 form a reverse thread. With this, by rotating the screw barrel 30 to the housing 20, the screw barrel 30 protrudes from the upper surface of the housing 20, and at the same time, the abutting portion 40 can protrude from the screw barrel 30 in a non-rotating state along the sliding shaft 12 (elongation). In other words, by only rotating the screw barrel 30, the screw barrel 30 and the abutting portion 40 can simultaneously protrude from the housing 20.

The user only needs to rotate the operating portion 34 of the screw barrel 30 until the contact enlarged diameter portion 48 of the contact portion 40 abuts the workpiece. After the contact enlarged diameter portion 48 abuts the workpiece, the rotation operation of the operating portion 34 is stopped, and the operation of the first jack 100 is completed. Since the workpiece is supported by a plurality of jacks 100, it is only necessary to perform the operations described above on the other jacks 100 in the same manner. After supporting the workpiece with all the jacks 100, the user fine-tunes the contact state of the workpiece with each jack 100. Then the user operates the stopper 26 to make the abutment body 26B abut on the outer peripheral surface of the screw barrel 30 screwed into the housing 20 (the outer peripheral surface of the screw barrel male thread 32). If the screw barrel 30 is restricted from the housing 20 Rotating, the support of the work piece by the jack 100 is completed. After the workpiece is supported by the jack 100, the workpiece is ground.

After finishing the grinding process of the workpiece, when the jack 100 is to be removed, the stopper 26 is released, and only the screw barrel 30 is rotated in the opposite direction as described above, so that the screw barrel 30 and the abutting portion 40 can protrude into the housing at the same time 20.

In this embodiment, as shown in FIG. 6, when the contact portion 40 of the jack 100 is extended to a predetermined height, the fall prevention stopper 49 attached to the lower end portion of the male thread 46 of the contact portion will interact with The step 38 in the lower end of the thick portion of the internal space of the screw barrel 30 abuts. In this way, the abutting portion 40 is further restricted in extension. When the extension of the screw barrel 30 by the abutment portion 40 is restricted, the rotation of the screw barrel 30 is also restricted, which can restrict the extension of the jack 100 as a whole. In this way, by adopting the configuration of the contact portion 40 having the fitting portion 44 fitted to the sliding shaft 12, even if the jack 100 has two screw fitting portions, only the contact portion 40 side is provided with a stopper for preventing falling off. The device 49 is sufficient, which is convenient in this regard.

<Second Embodiment>

The structure of the jack 100 in this embodiment and the structure equivalent to the structure of the jack 100 in the first embodiment is illustrated using the symbols used in the first embodiment, so detailed descriptions are omitted here.

As shown in FIGS. 7 and 8, the cross-sectional shape of the sliding shaft 12 in this embodiment is formed to have an arc-shaped protrusion 12C on a part of the outer peripheral edge of the main body 12B. Such a sliding shaft 12 can be formed by cutting the outer peripheral surface of a cylinder with a cutting tool or the like. Here, by using a cutting tool with a rectangular cutting section and cutting a part of the outer peripheral edge of the cylinder in such a way that a part of the width direction of the cutting section overlaps, a sliding part having an arc-shaped protrusion 12C is formed.轴12. The arc-shaped protrusion 12C of the sliding shaft 12 has a width dimension W2 of the arc portion of the arc-shaped protrusion 12C that is wider than the width dimension W1 on the side of the main body portion 12B. Here, the arc-shaped projections 12C are arranged at three locations at equal intervals along the outer circumference of the sliding shaft 12.

The sliding shaft insertion hole 42 of the abutting portion 40 into which the sliding shaft 12 is inserted is a part of the outer peripheral edge of the circular center hole 42A that is provided with the arc-shaped protrusion 12C of the sliding shaft 12 The shape of the corresponding outer protruding hole 42B. As shown in FIG. 8, the arc-shaped protrusion 12C of the sliding shaft 12 enters the outer protrusion hole 42B of the sliding shaft insertion hole 42, and the contact portion 40 can be provided in a non-rotating state with respect to the sliding shaft 12. In addition, in this embodiment, the two ends of the outer peripheral edge of the arc-shaped protrusion 12C of the sliding shaft 12 are formed with line contact portions in which the inner peripheral surface of the outer protrusion hole 42B of the sliding shaft insertion hole 42 is in line contact T. Therefore, the frictional force when the sliding shaft 12 slides in the non-rotating state in the sliding shaft insertion hole 42 is reduced, and smooth sliding of the sliding shaft 12 can be achieved. In addition, by arranging the linear contact portion T of the sliding shaft 12 and the sliding shaft insertion hole 42 in three or more locations in the circumferential direction, the sliding shaft 12 is assembled to the contact portion 40 (the sliding shaft insertion hole 42). Actually, the sliding shaft 12 can be assembled as designed.

As shown in FIG. 9, in this embodiment, the sliding shaft 12 and the sliding shaft supporting portion 14 are integrally formed. The sliding shaft supporting portion 14 forms a circular plate, and a bottom female thread 14C is formed from the bottom side of the sliding shaft supporting portion 14 at the center position of the sliding shaft 12. In addition, in the sliding shaft supporting portion 14, drainage holes 14D penetrating in the thickness direction of the sliding shaft supporting portion 14 are arranged at a plurality of locations in the circumferential direction.

The sliding shaft support portion 14 integrally formed with the sliding shaft 12 in this way is arranged on a stepped portion 29A formed on the inner side of the bottom of the housing 20. Then the sliding shaft support part 14 is abutted by the front ends of the three assembly screws N screwed in from the side of the housing 20, and is provided in the groove part of the housing 20 at a position corresponding to the bottom surface position of the sliding shaft support part 14 29B is inserted into the C-ring 50 and installed in the lower part of the housing 20.

In addition, when the sliding shaft support portion 14 is not provided with the drain hole 14D, it is also possible to install a shaft cap 60 for closing the opening of the sliding shaft insertion hole 42 of the contact enlarged diameter portion 48 (see No. 7 picture). By disposing a sealing member (not shown) in the contact portion between the shaft cap 60 and the sliding shaft insertion hole 42, the sliding shaft insertion hole 42 can be closed in a sealed state.

Furthermore, as shown in FIG. 9, a removable contact attachment 70 may be attached to the sliding shaft insertion hole 42 of the contact enlarged diameter portion 48. As long as it fits into the inner peripheral surface of the sliding shaft insertion hole 42 (the opening of the contact enlarged diameter portion 48) in the contact enlarged diameter portion 48, the insertion portion 72 of the contact attachment 70 is appropriately fitted. The ground can be changed to a male thread or dowel. In addition, although the abutting surface 74 of the abutting attachment 70 shown in FIG. 9 is formed in a spherical shape, it may be formed by the V groove 74A shown in FIG. 10 and the concave groove formed at the bottom of the V groove 74A. The abutting attachment 70 of the abutting surface 74 formed by 74B. When the contact portion 40 is formed of a magnetic body, a magnet 76 may be appropriately arranged on the bottom surface of the contact attachment 70. In addition, the shape of the contact attachment 70 may correspond to the shape of the contact portion of the support object supported by the jack 100. The contact surface 74 may also be provided with a contact surface drainage part (not shown).

In addition, as shown in FIGS. 11 and 12, the magnet portion 80 can be detachably attached to the sliding shaft support portion 14 attached to the housing 20. The magnet portion 80 is formed in a cylindrical shape having the same shape as that of the bottom surface of the sliding shaft support portion 14, and a magnet 82 is embedded in the bottom surface. The magnet portion 80 is detachably attached to the sliding shaft supporting portion 14 by inserting a screw (not shown) through the screw hole 84 and screwing it into the female thread 14C of the bottom surface of the sliding shaft supporting portion 14.

In addition, on the upper surface of the magnet portion 80, drainage grooves 86 extending in the radially outward direction of the magnet portion 80 with the screw hole 84 as the center are recessed in four grooves at equal intervals in the circumferential direction. Therefore, the liquid etc. entering from the opening of the sliding shaft insertion hole 42 flows into the gap between the sliding shaft insertion hole 42 and the sliding shaft 12 and the drain hole 14D, and then is discharged from the drain groove 86 to the outside of the jack 100.

The jack 100 in the present invention has been described in detail above based on the embodiment, but the technical scope of the present invention is not limited to the above embodiment. For example, the base 10 in the above-described embodiment is described as a form in which the sliding shaft 12 is formed as a hexagonal column, but the shape of the sliding shaft 12 can also be formed as other polygonal columns represented by a quadrangular column. . In addition, a shape in which a convex portion or a concave portion is provided on a part of the outer peripheral surface of the cylinder can also be adopted. In short, what is necessary is just to make it possible to make the contact part 40 move along the sliding shaft 12 in a non-rotating state with respect to the sliding shaft 12 inserted in the sliding shaft insertion hole 42.

In addition, although the base 10 in the first embodiment is described in a form in which the sliding shaft supporting portion 14 is formed with magnets, it can also be made in a form in which a magnet is installed on the bottom surface of the sliding shaft supporting portion 14, or in the sliding shaft supporting portion 14The form of a magnet. Furthermore, if a magnet is arranged on the flat plate on which the jack 100 is installed, a form in which the sliding shaft support portion 14 is formed of a magnetic body and no magnet is arranged may also be adopted.

In addition, although the case 20 has the knob portion 26A and the form of the contact body 26B that is screwed into the screw hole 24 and abuts on the outer peripheral surface of the screw barrel male thread 32 of the screw barrel 30, it can also be made only The abutment body 26B (without the knob portion 26A) of the hexagon socket fixing screw (so-called fixing screw) is used as the structure of the stopper 26. Furthermore, the structure of the stopper 26 may be omitted.

In addition, in the screw barrel 30, although the operating portion 34 is configured to have a flange shape that is larger in diameter than the housing 20, the operating portion 34 can also be made to have a smaller diameter than the housing 20. Moreover, it can also be comprised so that the operation part 34 may be comprised by the singular or plural protrusions protrudingly provided in the outer peripheral surface of the upper end part of the screw barrel male thread 32. As shown in FIG. In short, if it is a structure which can rotate the screw barrel 30, a specific form is not specifically limited.

In addition, in the above embodiment, the contact portion 40 has a contact portion with a larger diameter than the male thread 46 of the contact portion in the contact portion of the object to be supported. Although explained, it is also possible to make a configuration in which the contact enlarged diameter portion 48 is omitted. Even if the configuration of the contact enlarged diameter portion 48 is omitted, the contact attachment 70 can be used by attaching the insertion portion 72 to the sliding shaft insertion hole 42.

Moreover, in the above embodiment, although the form of attaching the fall-off prevention stopper 49 to the contact part male thread 46 of the contact part 40 was demonstrated, it is not limited by this form. For example, an anti-dropping stopper may be installed on both the screw barrel male thread 32 and the contact portion male thread 46, or only the lower end of the screw barrel male thread 32 of the screw barrel 30 may be installed with an anti-dropping stopper. In the case of installing the anti-dropping stopper on the screw barrel male thread 32 and the abutting portion male thread 46, it only needs to be installed on at least one of the screw barrel male thread 32 and the abutting portion male thread 46.

In addition to the above-mentioned modification examples, it is also possible to adopt an appropriate combination of the modification examples and the like described in the embodiment.

100‧‧‧Jack

10‧‧‧Base

12‧‧‧Sliding shaft

12A‧‧‧Male thread

14‧‧‧Sliding shaft support

14A‧‧‧Female thread

20‧‧‧Shell

22‧‧‧Female thread of housing

24‧‧‧Screw hole

26‧‧‧Stopper

26A‧‧‧Knob part

26B‧‧‧Abutting body

30‧‧‧Screw barrel

32‧‧‧Screw barrel male thread

34‧‧‧Operation Department

36‧‧‧Female thread of screw barrel

38‧‧‧Level difference

40‧‧‧Abutment Department

42‧‧‧Slide shaft insertion hole

44‧‧‧Mosaic part

46‧‧‧Abutment male thread

48‧‧‧Expanded part for contact

49‧‧‧Anti-dropping stopper

Claims (7)

A jack characterized by having: a base having a sliding shaft and a sliding shaft supporting part supporting the sliding shaft in a state where the sliding shaft is erected; And the inner wall is provided with a female thread; a screw barrel, which is cylindrical and screwed into the housing through a male thread provided on the outer wall, and is provided with and on the inner wall whose central axis is consistent with the outer wall The male thread of the outer wall is opposite to the female thread of the tooth, and the upper end portion is provided with an operating part; and an abutment part, which is screwed into the female thread of the screw barrel and the sliding shaft is non-rotating The state is inserted and can move along the sliding shaft; wherein at least one of the male thread of the screw barrel and the lower end of the abutting portion is provided with an anti-dropping stopper. The jack described in item 1 of the scope of patent application, wherein the upper end portion of the abutting portion is provided with an abutting enlarged diameter portion. The jack described in item 1 or item 2 of the scope of patent application, wherein a stopper is provided on the housing to restrict the rotation of the screw barrel to the housing at any position. The jack described in item 1 or item 2 of the scope of patent application, wherein a magnet is arranged on the sliding shaft support part. The jack described in item 1 or item 2 of the scope of patent application, wherein the sliding shaft system forms a polygonal column. The jack described in item 1 or item 2 of the scope of patent application, wherein on the outer peripheral surface of the sliding shaft, line contact portions that are in line contact with the abutting portion are formed at plural locations in the circumferential direction. For example, the jack described in item 1 or item 2 of the scope of patent application further has abutting attachments that can be attached to and detached from the abutting portion.

Images