JPH11314887A - Jack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose in a light weight and in a compact form, as well as to provide a high rigidity, and to improve the energy efficiency. SOLUTION: A base member 2 fixed on a base board; a support member 3 to support a screw shaft unrotatable, as well as its lower end is connected to the base member 2; and a screw part screwed to the above screw shaft; are provided, and an elevating member 4 moving forward and backward to the above support member 3 by being rotated integrally around the shaft; and a driving mechanism 5 provided at the upper end of the above support member 3, and to rotate the above elevating member 4; are also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack fixed on a base and supporting a work at a predetermined height.
More specifically, the present invention relates to a jack suitable for stably supporting a plurality of works having a three-dimensional curved surface arranged in a large number of rows and columns.

[0002]

2. Description of the Related Art When assembling a three-dimensional work such as an outer plate of a ship, for example, a jack as described in Japanese Patent Application Laid-Open No. 7-136946 is used.

The jack described in the above publication includes a support cylinder fixed on a base, a screw shaft rotatably supported in the support cylinder, and a nut member screwed to the screw shaft. An elevating cylinder that is held inside the support cylinder so as to be slidable in the axial direction and relatively unrotatable is provided.

When the screw shaft is rotated using a motor or the like, the nut member moves forward and backward along the screw shaft, and the elevating cylinder moves forward and backward with respect to the support cylinder. The load is supported by bringing the top of the elevating cylinder into contact with the lower surface of the work.

[0005] Usually, a large number of jacks are arranged vertically and horizontally on a flat base, and the height of each jack is adjusted so that a three-dimensionally shaped work can be stably supported.

[0006]

In the jack described in the above publication, the load acting on the lifting cylinder is transmitted to the screw shaft via a nut member, and a thrust bearing provided at the lower end of the screw shaft is provided. It is supported on the lower end of the support cylinder or the base through the support.

[0007] In the above structure, the supporting load acts directly on the thrust bearing. For this reason, the thrust bearing is easily damaged, not only shortening the life of the bearing, but also reducing the rigidity of the device. In addition, the structure for securing rigidity is complicated, and the weight of the device is increased.

Further, in the conventional jack, since the screw shaft is configured to rotate, the drive mechanism of the screw shaft has to be provided along the axis of the jack. For this reason, there has been a problem that the overall length of the apparatus is increased, and the forward / backward stroke of the elevating cylinder is shortened accordingly.

Further, since the screw shaft must be rotated while supporting the load, a large driving force is required. In addition, it is necessary to secure a driving force when a large load acts to increase the frictional force between the screw shaft and the nut member. For this reason, a motor having a large output has to be adopted, which not only increases the size of the device but also makes it difficult to save energy.

Further, depending on the form and work of the work,
It may be necessary to remove some of the jacks arranged on the base. However, as described above, since the weight of the device is large and the structure is complicated, it cannot be easily attached to and detached from the base.

The present invention has been conceived in view of the above-mentioned circumstances, and solves the above-mentioned conventional problems. The present invention has a high rigidity, can be made lightweight and compact, and can improve energy efficiency. It is an object to provide a jack that can be used.

[0012]

Means for Solving the Problems To solve the above problems, the present invention takes the following technical means.

The invention described in claim 1 of the present application provides a base member fixed on a base, a support member having a lower end connected to the base member, and supporting the screw shaft so as not to rotate. It has a screw part to be screwed to the screw shaft,
A jack comprising: a lifting member that moves forward and backward with respect to the support member by being integrally rotated about an axis; and a drive mechanism that is provided at an upper end of the support member and rotates the lifting member. It is.

In the jack according to the present invention, the screw shaft is fixedly provided on the support member, and the elevating member is moved in the vertical direction by integrally rotating the elevating member. That is, the lifting member is moved up and down while rotating. A drive mechanism is provided at the upper end of the support member to rotate the elevating member.

In the above configuration, the load acting on the screw shaft via the screw portion of the lifting member is directly supported by the support member or the base member. For this reason, it is possible to support the load without passing through a rotating member such as a thrust bearing, and the problem of the life of the bearing or the like is eliminated. In addition, high rigidity can be ensured, the structure can be simplified, and the weight can be reduced.

Further, it is sufficient that the load is not applied to the driving mechanism and that the output is sufficient to rotate the elevating member. For this reason, it is also possible to employ a drive motor having a smaller output than a conventional jack, and it is possible to reduce the size of the drive mechanism. Moreover, since there is no need to rotate the screw shaft, there is no need to provide a drive mechanism along the load action line. Therefore, not only can the overall length of the device be reduced, but also the stroke of the lifting member can be increased.

According to a second aspect of the present invention, the driving mechanism is rotatably supported on the upper end of the support member, and the outer peripheral portion of the elevating member is allowed to rotate relatively while allowing relative movement in the axial direction. A ring gear fitted in impossible, a drive gear meshing with the ring gear and rotating it,
And a motor supported by the support member and configured to rotate the drive gear.

The ring gear is formed, for example, with a keyway extending in the axial direction on the outer peripheral portion of the elevating member, and fitted into the elevating member via a sliding key so that the ring gear can be relatively moved in the axial direction and cannot be relatively rotated. Can be installed. Also, a spline-shaped fitting means can be adopted.

The ring gear is rotated by a driving gear that meshes with the ring gear. By selecting the number of teeth of the ring gear and the driving gear, the driving force can be efficiently applied. Moreover, in the present invention, the ring gear is not subjected to any load acting on the work, so that the ring gear can be rotated with a small driving force.
The size of the motor can be reduced. As a result, the weight of the device can be reduced.

The type of motor for rotating the driving gear is not limited. For example, motors of various types and mechanisms such as a stepping motor and an induction motor can be adopted. It is desirable to employ a motor capable of numerically controlling the rotation speed and the rotation position with high accuracy.

According to a third aspect of the present invention, the supporting member is formed in a cylindrical shape having a screw shaft supported in an internal space, and a screw portion for screwing the elevating member to the screw shaft is provided at a lower end portion. It is formed to have a cylindrical shape and to protrude and retract from a cylindrical space formed between the screw shaft and the support member.

The apparatus can be downsized by moving the elevating member forward and backward while rotating it from the cylindrical space between the cylindrical support member and the screw shaft. Further, since the elevating member can be guided and supported between the screw shaft and the support member, high rigidity can be secured.

According to the invention described in claim 4 of the present application, the screw shaft is formed of a cylindrical member having a thread on an outer peripheral portion, and a limit switch is provided in an internal space thereof. The limit switch is operated by projecting from a window provided on the peripheral wall of the cylindrical member and displacing the operating rod by the elevating member.

By restricting the range of movement of the elevating member by the limit switch, safety is improved. Further, since the screw shaft is formed in a cylindrical shape and the limit switch is provided in the internal space, it is not necessary to separately secure a space for providing the limit switch, and the apparatus can be downsized. In addition, since the limit switch is housed inside the screw shaft, there is no danger of dust or the like adhering to the limit switch, and the operation reliability is improved.

According to a fifth aspect of the present invention, a tapered contact surface is provided for abutting the base member and the support member with each other, and the support member can be attached to and detached from the base member via the contact surface. It is connected to.

By connecting the base member and the support member via the tapered contact surface, not only can the positioning accuracy be secured, but also the load can be smoothly applied from the support member to the base member while securing the connection rigidity. Can be transmitted. In addition, the attachment and detachment of the support member can be performed very easily, and when the jack is in the way, the upper part can be easily removed from the support member.

According to the invention described in claim 6 of the present application, a guide support portion for slidably contacting the outer surface of the elevating member and guiding and supporting the elevating member is provided on the upper portion of the drive mechanism.

A screw portion for screwing the elevating member with the screw shaft;
By supporting at two locations at the upper end of the support member, the rigidity against a lateral force is greatly improved. In addition, it is possible to prevent the swinging movement of the elevating member.

The invention described in claim 7 of the present application is formed so as to be able to expand and contract in the axial direction, and the upper end is connected to the upper end of the lifting member so as to be relatively rotatable, while the lower end is connected to the support member. With a cover.

When the outer peripheral portion of the elevating member is slidably supported by the upper end portion of the supporting member as in the invention described in claim 6, when dust or the like adheres to the outer peripheral portion of the elevating member, the power required for rotation is increased. Also increase. By providing the cover, adhesion of dust and the like can be prevented, and smooth operation can be ensured. As the form of the cover, for example, a bellows-like cover can be adopted.

The invention described in claim 8 of the present application is characterized in that the motor shaft or the drive gear is detachably mounted on the motor shaft or the drive gear, and the motor shaft or the drive gear is manually rotated to thereby allow the work of the lifting member to move. Is provided with a release lever capable of releasing the supporting force of the release lever.

When a large number of jacks are used in an array,
The support load may concentrate on some jacks. In such a case, the meshing force between the screw shaft and the screw portion of the elevating member increases, and a large power is required to release the engagement. For this reason, conventionally, a motor having an unnecessary output has been provided.

According to the present invention, in such a case, the ring gear is manually and forcibly rotated to remove the load acting on the ring gear. With this, when a large force acts and the movement of the elevating member stops,
The applied load can be easily released. Further, it is not necessary to employ a motor having an output more than necessary, and the size of the apparatus can be reduced. Further, since the engagement of the gear can be reliably released, the reliability of the device is also improved.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be specifically described below with reference to the drawings.

FIGS. 1 and 2 are external views of a jack according to the present invention. As shown in these figures, the jack 1
A base member 2 fixed to a base (not shown), a support member 3 detachably connected to the base member 2, an elevating member 4 supported by the support member 3 so as to be able to advance and retreat, And a drive mechanism 5 provided at the upper end of the camera. FIG. 1 is a front view showing a state where the elevating member 4 is extended to a maximum extending position. FIG. 2 is a side view showing a state in which the elevating member 4 is housed in the support member 3.

The base member 2 is constructed by vertically standing a cylindrical member 7 on a square plate 6 via four support legs 8. An adjusting sleeve 9 for positioning and supporting the support member 3 is mounted on the upper end of the cylindrical member 7 by welding. In this embodiment, the cylindrical member 7 and the support legs 8 are joined by welding on the square plate 6, but the support legs 8 can be directly welded on a base on which the device is installed.

As shown in FIG. 3, a substantially U-shaped arm portion 17 is provided on a side portion of the support member 3. The support member 3 is lifted by lifting the arm 17.
The upper part is configured to be easily detachable from the base member 2.

FIG. 4 shows a cross section along the axis of the lower end portion of the support member 3 or the base member 2. As shown in this figure, the support member 3 comprises a cylindrical main body 11 and the cylindrical main body 1.
1 includes a screw shaft 12 supported in the internal space and a support ring 13 provided by welding at an intermediate portion of the outer periphery of the cylindrical main body 11.

The screw shaft 12 is formed in a cylindrical shape with a trapezoidal screw formed on the outer periphery, and the lower end is formed in the cylindrical main body 1.
1 is fixed to the bottom using screws 10. A cylindrical space for accommodating the elevating member 4 is formed between the outer periphery of the screw shaft 12 and the inner peripheral surface of the cylindrical main body 11.

The upper edge of the adjusting sleeve 9 and the lower edge of the support ring abut against each other to form a tapered contact which positions and holds the support member 3 at a predetermined position with respect to the base member 2. Surfaces 14 and 15 are respectively formed.

The lower end of the support member 3 is fitted and supported on the inner peripheral portion of the base end 16 of the cylindrical member 7, while the contact surface 15 of the support ring 13 is
The base member 2 is detachably connected to the base member 2 by being supported in contact with the contact surface 14. By providing the tapered contact surfaces 14 and 15 which are brought into contact with each other,
As shown in FIG. 3, the lower end of the support member 3 is
, The support member 3 can be fixed to the base member 2 with high accuracy and reliability. In addition, the load can be stably transmitted to the base member 2, and the support member 3 can be easily removed.

As shown in FIGS. 1 and 5, the elevating member 4 includes a cylindrical shaft portion 21, a tip metal fitting 22 provided at an upper end of the shaft portion 21, and a screw portion provided at an inner periphery of the lower end portion. 23. A bellows-like cover 24 is provided so as to cover the outer surface of the shaft portion 21. On the outer peripheral surface of the shaft portion 21, two engagement grooves 25 extending in the axial direction are formed on opposite sides of the shaft core.

FIG. 6 is a plan view showing a state where the driving mechanism 5 is exposed. The drive mechanism 5 includes a ring gear 32 rotatably held at an upper end of the support member 3 via a bearing 31, a drive gear 33 disposed on a side of the ring gear 32 and meshing with the ring gear 32, And a motor 34 for driving the drive gear 33. The bearing 31, the ring gear 32, and the drive gear 33
Is a gear case 3 formed at the upper end of the support member 3.
5. On the other hand, the motor 34 is housed in a housing 26 provided on the side of the support member 3.

The ring gear 32 is supported with the lifting member 4 inserted into the opening 27. On the inner peripheral edge of the ring gear 32, a pair of sliding keys 36 that engage with the engagement grooves 25 of the elevating member 4 are provided at opposing positions with the axis interposed therebetween. Inserted so that relative movement is allowed and relative rotation is not possible.

The motor 34 according to the present embodiment employs an induction motor and, as shown in FIG. 1, a rotary encoder 38 is mounted on the lower end of a shaft 39 to control the rotational speed and the rotational position. It is configured so that it can be detected.

When the motor 34 is rotated, the ring gear 32 is rotated via the drive gear 33. Since the ring gear 32 is fitted into the elevating member 4 so as not to rotate relatively, the elevating member 4 is rotated. Screw part 2 provided at the lower end of the elevating member 4
Since the screw 3 is screwed to the screw shaft 12, the lifting member 4 is moved up and down in accordance with the rotation.

In the jack according to the present invention, the load for supporting the work is transmitted to the screw shaft 12 of the support member 3 via the tip metal fitting 22, the shaft portion 21 and the screw portion 23 of the lifting member 4, and the contact surface is provided. It is directly supported by the base member 2 via 14 and 15. Therefore, there is no portion that supports the load via a thrust bearing or the like unlike a conventional jack. Therefore, high rigidity can be ensured, and the bearing is not damaged.

Further, since most of the drive mechanism 5 such as the motor 34 is provided on the side of the support member 3, the length of the device in the axial direction is greatly reduced as compared with the conventional jack. As a result, the expansion / contraction stroke of the elevating member 4 can be greatly increased.

Further, since no load from the work acts on the ring gear 32 for rotating the elevating member 4, the transmission efficiency of the driving force is high. For this reason, it is possible to reduce the size of the device by reducing the size of the motor, and to further reduce the weight of the device.

Further, by employing an induction motor as the motor 34 and controlling the rotation speed by an inverter, the lifting member 4 can be moved up and down at a desired speed, thereby greatly improving the working efficiency. . In addition, by attaching a rotary encoder 38 to the induction motor 34, a movement pulse can be managed. For this reason, it is possible to perform highly accurate control with an inexpensive motor. Further, a control error or the like can be easily detected.

Further, in this embodiment, as shown in FIG. 5, the upper part of the gear case 35 accommodating the ring gear 32 is slidably brought into contact with the outer surface of the elevating member 4 to guide and support the elevating member 4. A guide support portion 41 is provided.

The guide support 41 is provided with the gear case 3.
The cylindrical member 42 is welded to the upper portion of the cylindrical member 5 and an annular guide ring 43 is joined to the inner peripheral portion of the upper edge of the cylindrical member. The annular guide ring 43 is formed of a bearing metal, abuts against the outer peripheral surface of the elevating member 4 to slide and guide, and supports a lateral force acting on the elevating member 4. By providing the guide support portion 41,
The stiffness against lateral load is significantly increased. In addition, it is possible to prevent the rotational vibration of the elevating member 4 that moves up and down while rotating.

As shown in FIG. 6, a pair of pin holes 52 are formed on the side of the shaft hole 51 of the drive gear 33. As shown in FIG. 5, an opening 54 communicating with the center of the drive gear 33 is provided in the upper wall 53 of the gear case 35. Then, through the opening 54,
The release lever 55 for manually forcibly rotating the drive gear 33 can be connected.

As shown in FIG. 5, the release lever is connected to a shaft 57 having a pair of pins 56 at its lower end, which engage with the pin holes 52, via a ratchet mechanism or the like. Arm 58.

The shaft portion 57 is inserted into the gear case 35 through the opening 54 and the pair of pins 5
6 is engaged with the pin hole 52 of the drive gear 33 so that the arm 5
When the drive gear 8 is reciprocated, the drive gear 33 and the ring gear 32 can be forcibly rotated.

When the release lever 55 is configured to be attachable, an excessive load acts on the elevating member 4 from the work, and the lifting member 4 cannot be moved up and down by the driving force of the motor 34 (biting state). In addition, the applied load can be easily released. As a result, the motor 34
It is not necessary to request an excessively high output, and it is possible to employ a motor having a minimum output for rotating and driving the elevating member 4. Thereby, the size and cost of the device can be reduced.

Although FIG. 5 shows a state in which the release lever is mounted, normally, the release lever is not mounted, and a cover (not shown) covering the opening 54 is mounted.

As shown in FIGS. 4 and 5, in the present embodiment, the lifting member 4 is provided at the upper and lower ends of the internal space of the screw shaft 12.
Limit switches 61 and 62 are provided to regulate the maximum extension position and the storage position. The above limit switch 6
The operating rods 63 and 64 of the first and second projections project from window openings 65 and 66 provided on the outer peripheral wall of the screw shaft 12.
When the screw portion 23 which is screwed into the screw shaft 12 and advances and retracts reaches the position of the window openings 65 and 66, the screw portion 23
Is in contact with the operating rods 63 and 64 and the limit switch 6
1, 62 are operated. By providing the limit switches 61 and 62 inside the screw shaft 12, the influence of dust and the like is reduced, and the reliability of operation can be improved.

As shown in FIG. 7, the upper end of the bellows-like cover 24 is connected to the shaft portion 21 via a bearing 67 and an annular mounting member 68 fitted around the end of the shaft portion 21 of the elevating member. Are fixed so as to be rotatable relative to the motor. On the other hand, the lower end of the cover 24 is, as shown in FIG.
The elevating member 4 is fixed to the outer periphery of the guide support portion 41 and is expanded and contracted as the elevating member 4 advances and retreats. By providing the cover 24 to protect the outer peripheral surface of the shaft portion 21, it is possible to prevent the frictional force with the guide support portion 41 from increasing and the rigidity from being reduced.

The tip fitting 22 attached to the tip of the elevating member 21 is detachably fitted into the tip of the shaft hole 69 of the shaft 21. The end fitting 22 can be manufactured to have a desired length. For example, as shown in FIG. 8, a long end fitting 72 is mounted to support a work at a high position from the base. Can also.

The present invention is not limited to the above embodiment. In the embodiment, the present invention is applied to a jack that statically supports a work having a three-dimensional shape, but the present invention can be applied to a press device that processes a work into a three-dimensional shape.

In the embodiment, the present invention is applied to the jack in which the load acts in the vertical direction. However, the jack may be installed in a state where the axis of the jack is inclined to support the force in the oblique direction. it can.

The operation method of the jacks is not particularly limited. The jacks can be operated individually by operating buttons 70 and 71 provided on the housing 26 of the motor in the up and down direction. It can be operated simultaneously with centralized control.

[Brief description of the drawings]

FIG. 1 is a front view illustrating a state where a lifting member is extended to a maximum extension position.

FIG. 2 is a side view illustrating a state in which a lifting member is stored in a support member.

FIG. 3 is a view showing a state in which an upper portion of a support member is detached from a base member.

FIG. 4 is an axial sectional view showing a lower structure of the jacket.

FIG. 5 is an axial sectional view showing a structure of a driving mechanism.

FIG. 6 is a plan view showing the structure of the driving mechanism.

FIG. 7 is a view showing a structure of an upper end portion of a lifting member.

FIG. 8 is a view showing a state in which a long tip metal fitting is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Jack 2 Base member 3 Support member 4 Elevating member 5 Drive mechanism 12 Screw shaft 23 Screw part

[Procedure amendment]

[Submission date] March 26, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Jack

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack fixed on a base and supporting a work at a predetermined height.
More specifically, the present invention relates to a jack suitable for stably supporting a plurality of works having a three-dimensional curved surface arranged in a large number of rows and columns.

[0002]

2. Description of the Related Art When assembling a three-dimensional work such as an outer plate of a ship, for example, a jack as described in JP-A-7-136946 is used.

The jack described in the above publication includes a support cylinder fixed on a base, a screw shaft rotatably supported in the support cylinder, and a nut member screwed to the screw shaft. An elevating cylinder that is held inside the support cylinder so as to be slidable in the axial direction and relatively unrotatable is provided.

When the screw shaft is rotated using a motor or the like, the nut member moves forward and backward along the screw shaft, and the elevating cylinder moves forward and backward with respect to the support cylinder. The load is supported by bringing the top of the elevating cylinder into contact with the lower surface of the work.

[0005] Usually, a large number of jacks are arranged vertically and horizontally on a flat base, and the height of each jack is adjusted so that a three-dimensionally shaped work can be stably supported.

[0006]

In the jack described in the above publication, the load acting on the lifting cylinder is transmitted to the screw shaft via a nut member, and a thrust bearing provided at the lower end of the screw shaft is provided. It is supported on the lower end of the support cylinder or the base through the support.

[0007] In the above structure, the supporting load acts directly on the thrust bearing. For this reason, the thrust bearing is easily damaged, not only shortening the life of the bearing, but also reducing the rigidity of the device. In addition, the structure for securing rigidity is complicated, and the weight of the device is increased.

Further, in the conventional jack, since the screw shaft is configured to rotate, the drive mechanism of the screw shaft has to be provided along the axis of the jack. For this reason, there has been a problem that the overall length of the apparatus is increased, and the forward / backward stroke of the elevating cylinder is shortened accordingly.

Further, since the screw shaft must be rotated while supporting the load, a large driving force is required. In addition, it is necessary to secure a driving force when a large load acts to increase the frictional force between the screw shaft and the nut member. For this reason, a motor having a large output has to be adopted, which not only increases the size of the device but also makes it difficult to save energy.

Further, depending on the form and work of the work,
It may be necessary to remove some of the jacks arranged on the base. However, as described above, since the weight of the device is large and the structure is complicated, it cannot be easily attached to and detached from the base.

The present invention has been conceived in view of the above-mentioned circumstances, and solves the above-mentioned conventional problems. The present invention has a high rigidity, can be made lightweight and compact, and can improve energy efficiency. It is an object to provide a jack that can be used.

[0012]

Means for Solving the Problems To solve the above problems, the present invention takes the following technical means.

The invention described in claim 1 of the present application provides a base member fixed on a base, a support member having a lower end connected to the base member, and supporting the screw shaft so as not to rotate. It has a screw part to be screwed to the screw shaft,
A jack comprising: a lifting member that moves forward and backward with respect to the support member by being integrally rotated about an axis; and a drive mechanism that is provided at an upper end of the support member and rotates the lifting member. It is.

In the jack according to the present invention, the screw shaft is fixedly provided on the support member, and the elevating member is moved in the vertical direction by integrally rotating the elevating member. That is, the lifting member is moved up and down while rotating. A drive mechanism is provided at the upper end of the support member to rotate the elevating member.

In the above configuration, the load acting on the screw shaft via the screw portion of the lifting member is directly supported by the support member or the base member. For this reason, it is possible to support the load without passing through a rotating member such as a thrust bearing, and the problem of the life of the bearing or the like is eliminated. In addition, high rigidity can be ensured, the structure can be simplified, and the weight can be reduced.

Further, it is sufficient that the load is not applied to the driving mechanism and that the output is sufficient to rotate the elevating member. For this reason, it is also possible to employ a drive motor having a smaller output than a conventional jack, and it is possible to reduce the size of the drive mechanism. Moreover, since there is no need to rotate the screw shaft, there is no need to provide a drive mechanism along the load action line. Therefore, not only can the overall length of the device be reduced, but also the stroke of the lifting member can be increased.

According to a second aspect of the present invention, the driving mechanism is rotatably supported on the upper end of the support member, and the outer peripheral portion of the elevating member is allowed to rotate relatively while allowing relative movement in the axial direction. A ring gear fitted in impossible, a drive gear meshing with the ring gear and rotating it,
And a motor supported by the support member and configured to rotate the drive gear.

The ring gear is formed, for example, with a keyway extending in the axial direction on the outer peripheral portion of the elevating member, and fitted into the elevating member via a sliding key so that the ring gear can be relatively moved in the axial direction and cannot be relatively rotated. Can be installed. Also, a spline-shaped fitting means can be adopted.

The ring gear is rotated by a driving gear that meshes with the ring gear. By selecting the number of teeth of the ring gear and the driving gear, the driving force can be efficiently applied. Moreover, in the present invention, the ring gear is not subjected to any load acting on the work, so that the ring gear can be rotated with a small driving force.
The size of the motor can be reduced. As a result, the weight of the device can be reduced.

The type of motor for rotating the driving gear is not limited. For example, motors of various types and mechanisms such as a stepping motor and an induction motor can be adopted. It is desirable to employ a motor capable of numerically controlling the rotation speed and the rotation position with high accuracy.

According to a third aspect of the present invention, the supporting member is formed in a cylindrical shape having a screw shaft supported in an internal space, and a screw portion for screwing the elevating member to the screw shaft is provided at a lower end portion. It is formed to have a cylindrical shape and to protrude and retract from a cylindrical space formed between the screw shaft and the support member.

The apparatus can be downsized by moving the elevating member forward and backward while rotating it from the cylindrical space between the cylindrical support member and the screw shaft. Further, since the elevating member can be guided and supported between the screw shaft and the support member, high rigidity can be secured.

According to the invention described in claim 4 of the present application, the screw shaft is formed of a cylindrical member having a thread on an outer peripheral portion, and a limit switch is provided in an internal space thereof. The limit switch is operated by projecting from a window provided on the peripheral wall of the cylindrical member and displacing the operating rod by the elevating member.

By restricting the range of movement of the elevating member by the limit switch, safety is improved. Further, since the screw shaft is formed in a cylindrical shape and the limit switch is provided in the internal space, it is not necessary to separately secure a space for providing the limit switch, and the apparatus can be downsized. In addition, since the limit switch is housed inside the screw shaft, there is no danger of dust or the like adhering to the limit switch, and the operation reliability is improved.

According to the invention described in claim 5 of the present application, a guide supporting portion for slidably contacting the outer surface of the elevating member and guiding and supporting the elevating member is provided on the upper portion of the driving mechanism.

A screw portion for screwing the elevating member with the screw shaft;
By supporting at two locations at the upper end of the support member, the rigidity against a lateral force is greatly improved. In addition, it is possible to prevent the swinging movement of the elevating member.

The invention described in claim 6 of the present application is formed so as to be able to expand and contract in the axial direction, and the upper end is connected to the upper end of the elevating member so as to be relatively rotatable, while the lower end is connected to the support member. With a cover.

When the outer peripheral portion of the elevating member is slidably supported by the upper end of the supporting member as in the invention described in claim 5, when dust or the like adheres to the outer peripheral portion of the elevating member, the power required for rotation is increased. Also increase. By providing the cover, adhesion of dust and the like can be prevented, and smooth operation can be ensured. As the form of the cover, for example, a bellows-like cover can be adopted.

[0029] The invention described in claim 7 of the present application is such that the motor shaft or the drive gear is detachably mounted on the motor shaft or the drive gear, and the work of the lifting member is manually rotated by rotating the motor shaft or the drive gear. Is provided with a release lever capable of releasing the supporting force of the release lever.

When a large number of jacks are used in an array,
The support load may concentrate on some jacks. In such a case, the meshing force between the screw shaft and the screw portion of the elevating member increases, and a large power is required to release the engagement. For this reason, conventionally, a motor having an unnecessary output has been provided.

In the present invention, in such a case as described above, the ring gear is manually forcibly rotated to remove the acting load. With this, when a large force acts and the movement of the elevating member stops,
The applied load can be easily released. Further, it is not necessary to employ a motor having an output more than necessary, and the size of the apparatus can be reduced. Further, since the engagement of the gear can be reliably released, the reliability of the device is also improved.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be specifically described below with reference to the drawings.

FIGS. 1 and 2 are external views of a jack according to the present invention. As shown in these figures, the jack 1
A base member 2 fixed to a base (not shown), a support member 3 detachably connected to the base member 2, an elevating member 4 supported by the support member 3 so as to be able to advance and retreat, And a drive mechanism 5 provided at the upper end of the camera. FIG. 1 is a front view showing a state where the elevating member 4 is extended to a maximum extending position. FIG. 2 is a side view showing a state in which the elevating member 4 is housed in the support member 3.

The base member 2 is constructed by vertically standing a cylindrical member 7 on a square plate 6 via four support legs 8. An adjusting sleeve 9 for positioning and supporting the support member 3 is mounted on the upper end of the cylindrical member 7 by welding. In this embodiment, the cylindrical member 7 and the support legs 8 are joined by welding on the square plate 6, but the support legs 8 can be directly welded on a base on which the device is installed.

As shown in FIG. 3, a substantially U-shaped arm portion 17 is provided on a side portion of the support member 3. The support member 3 is lifted by lifting the arm 17.
The upper part is configured to be easily detachable from the base member 2.

FIG. 4 shows a cross section along the axis of the lower end of the support member 3 or the base member 2. As shown in this figure, the support member 3 comprises a cylindrical main body 11 and the cylindrical main body 1.
1 includes a screw shaft 12 supported in the internal space and a support ring 13 provided by welding at an intermediate portion of the outer periphery of the cylindrical main body 11.

The screw shaft 12 is formed in a cylindrical shape having a trapezoidal screw formed on an outer peripheral portion, and a lower end portion has a cylindrical main body 1.
1 is fixed to the bottom using screws 10. A cylindrical space for accommodating the elevating member 4 is formed between the outer periphery of the screw shaft 12 and the inner peripheral surface of the cylindrical main body 11.

The upper edge of the adjusting sleeve 9 and the lower edge of the support ring are in contact with each other to form a tapered contact which positions and holds the support member 3 at a predetermined position with respect to the base member 2. Surfaces 14 and 15 are respectively formed.

The lower end of the support member 3 is fitted and supported on the inner peripheral portion of the base end 16 of the cylindrical member 7, while the contact surface 15 of the support ring 13 is
The base member 2 is detachably connected to the base member 2 by being supported in contact with the contact surface 14. By providing the tapered contact surfaces 14 and 15 which are brought into contact with each other,
As shown in FIG. 3, the lower end of the support member 3 is
, The support member 3 can be fixed to the base member 2 with high accuracy and reliability. In addition, the load can be stably transmitted to the base member 2, and the support member 3 can be easily removed.

As shown in FIGS. 1 and 5, the elevating member 4 has a cylindrical shaft portion 21, a tip metal fitting 22 provided at an upper end of the shaft portion 21, and a screw portion provided at an inner periphery of the lower end portion. 23. A bellows-like cover 24 is provided so as to cover the outer surface of the shaft portion 21. On the outer peripheral surface of the shaft portion 21, two engagement grooves 25 extending in the axial direction are formed on opposite sides of the shaft core.

FIG. 6 is a plan view showing a state where the driving mechanism 5 is exposed. The drive mechanism 5 includes a ring gear 32 rotatably held at an upper end of the support member 3 via a bearing 31, a drive gear 33 disposed on a side of the ring gear 32 and meshing with the ring gear 32, And a motor 34 for driving the drive gear 33. The bearing 31, the ring gear 32, and the drive gear 33
Is a gear case 3 formed at the upper end of the support member 3.
5. On the other hand, the motor 34 is housed in a housing 26 provided on the side of the support member 3.

The ring gear 32 is supported with the lifting member 4 inserted into the opening 27. On the inner peripheral edge of the ring gear 32, a pair of sliding keys 36 that engage with the engagement grooves 25 of the elevating member 4 are provided at opposing positions with the axis interposed therebetween. Inserted so that relative movement is allowed and relative rotation is not possible.

The motor 34 according to the present embodiment employs an induction motor and, as shown in FIG. 1, a rotary encoder 38 is attached to the lower end of a shaft 39, so that the rotational speed and the rotational position can be adjusted. It is configured so that it can be detected.

When the motor 34 is rotated, the ring gear 32 is rotated via the drive gear 33. Since the ring gear 32 is fitted into the elevating member 4 so as not to rotate relatively, the elevating member 4 is rotated. Screw part 2 provided at the lower end of the elevating member 4
Since the screw 3 is screwed to the screw shaft 12, the lifting member 4 is moved up and down in accordance with the rotation.

In the jack according to the present invention, the load for supporting the work is transmitted to the screw shaft 12 of the support member 3 via the tip fitting 22, the shaft portion 21 and the screw portion 23 of the elevating member 4, and the contact surface is formed. It is directly supported by the base member 2 via 14 and 15. Therefore, there is no portion that supports the load via a thrust bearing or the like unlike a conventional jack. Therefore, high rigidity can be ensured, and the bearing is not damaged.

Further, since most of the drive mechanism 5 such as the motor 34 is provided on the side of the support member 3, the length of the device in the axial direction is greatly reduced as compared with the conventional jack. As a result, the expansion / contraction stroke of the elevating member 4 can be greatly increased.

Further, since no load from the work acts on the ring gear 32 for rotating the elevating member 4, the transmission efficiency of the driving force is high. For this reason, it is possible to reduce the size of the device by reducing the size of the motor, and to further reduce the weight of the device.

Further, by employing an induction motor as the motor 34 and controlling the rotation speed by an inverter, the elevating member 4 can be moved up and down at a desired speed, and the working efficiency can be greatly improved. . In addition, by attaching a rotary encoder 38 to the induction motor 34, a movement pulse can be managed. For this reason, it is possible to perform highly accurate control with an inexpensive motor. Further, a control error or the like can be easily detected.

Further, in this embodiment, as shown in FIG. 5, the upper part of the gear case 35 accommodating the ring gear 32 is slidably brought into contact with the outer surface of the elevating member 4 to guide and support the elevating member 4. A guide support portion 41 is provided.

The guide support 41 is provided with the gear case 3.
The cylindrical member 42 is welded to the upper portion of the cylindrical member 5 and an annular guide ring 43 is joined to the inner peripheral portion of the upper edge of the cylindrical member. The annular guide ring 43 is formed of a bearing metal, abuts against the outer peripheral surface of the elevating member 4 to slide and guide, and supports a lateral force acting on the elevating member 4. By providing the guide support portion 41,
The stiffness against lateral load is significantly increased. In addition, it is possible to prevent the rotational vibration of the elevating member 4 that moves up and down while rotating.

As shown in FIG. 6, a pair of pin holes 52 are formed on the side of the shaft hole 51 of the drive gear 33. As shown in FIG. 5, an opening 54 communicating with the center of the drive gear 33 is provided in the upper wall 53 of the gear case 35. Then, through the opening 54,
The release lever 55 for manually forcibly rotating the drive gear 33 can be connected.

As shown in FIG. 5, the release lever is connected to a shaft 57 having a pair of pins 56 at its lower end, which engage with the pin holes 52, via a ratchet mechanism or the like. Arm 58.

The shaft portion 57 is inserted into the gear case 35 through the opening 54, and the pair of pins 5
6 is engaged with the pin hole 52 of the drive gear 33 so that the arm 5
When the drive gear 8 is reciprocated, the drive gear 33 and the ring gear 32 can be forcibly rotated.

When the release lever 55 is configured to be attachable, an excessive load is applied to the lifting member 4 from the work, and the lifting member 4 cannot be raised or lowered by the driving force of the motor 34 (biting state). In addition, the applied load can be easily released. As a result, the motor 34
It is not necessary to request an excessively high output, and it is possible to employ a motor having a minimum output for rotating and driving the elevating member 4. Thereby, the size and cost of the device can be reduced.

Although FIG. 5 shows a state in which the release lever is mounted, normally, the release lever is not mounted, and a cover (not shown) covering the opening 54 is mounted.

As shown in FIGS. 4 and 5, in the present embodiment, the lifting member 4 is provided at the upper and lower ends of the internal space of the screw shaft 12.
Limit switches 61 and 62 are provided to regulate the maximum extension position and the storage position. The above limit switch 6
The operating rods 63 and 64 of the first and second projections project from window openings 65 and 66 provided on the outer peripheral wall of the screw shaft 12.
When the screw portion 23 which is screwed into the screw shaft 12 and advances and retracts reaches the position of the window openings 65 and 66, the screw portion 23
Is in contact with the operating rods 63 and 64 and the limit switch 6
1, 62 are operated. By providing the limit switches 61 and 62 inside the screw shaft 12, the influence of dust and the like is reduced, and the reliability of operation can be improved.

As shown in FIG. 7, the upper end of the bellows-like cover 24 is connected to the shaft portion 21 via a bearing 67 and an annular mounting member 68 fitted around the end of the shaft portion 21 of the elevating member. Are fixed so as to be rotatable relative to the motor. On the other hand, the lower end of the cover 24 is, as shown in FIG.
The elevating member 4 is fixed to the outer periphery of the guide support portion 41 and is expanded and contracted as the elevating member 4 moves forward and backward. By providing the cover 24 to protect the outer peripheral surface of the shaft portion 21, it is possible to prevent the frictional force with the guide support portion 41 from increasing and the rigidity from being reduced.

The tip fitting 22 attached to the tip of the elevating member 21 is detachably fitted into the tip of the shaft hole 69 of the shaft 21. The tip fitting 22 can be manufactured to have a desired length. For example, as shown in FIG. 8, a long tip fitting 72 is mounted to support a workpiece at a high position from the base. Can also.

The present invention is not limited to the above embodiment. In the embodiment, the present invention is applied to a jack that statically supports a work having a three-dimensional shape, but the present invention can be applied to a press device that processes a work into a three-dimensional shape.

Further, in the embodiment, the present invention is applied to the jack in which the load acts in the vertical direction. However, the jack may be installed in a state where the axis of the jack is inclined to support the force in the oblique direction. it can.

The operation method of the jacks is not particularly limited. The jacks can be operated individually by operating buttons 70 and 71 provided on the motor housing 26 in the vertical direction, or a large number of jacks can be operated by a computer. It can be operated simultaneously with centralized control.

[Brief description of the drawings]

FIG. 1 is a front view illustrating a state where a lifting member is extended to a maximum extension position.

FIG. 2 is a side view illustrating a state in which a lifting member is stored in a support member.

FIG. 3 is a view showing a state in which an upper portion of a support member is detached from a base member.

FIG. 4 is an axial sectional view showing a lower structure of the jacket.

FIG. 5 is an axial sectional view showing a structure of a driving mechanism.

FIG. 6 is a plan view showing the structure of the driving mechanism.

FIG. 7 is a view showing a structure of an upper end portion of a lifting member.

FIG. 8 is a view showing a state in which a long tip metal fitting is mounted.

[Description of Signs] 1 jack 2 base member 3 support member 4 elevating member 5 drive mechanism 12 screw shaft 23 screw portion 

Claims (8)

[Claims] 1. A base member fixed on a base, a lower end connected to the base member, and a support member for supporting a screw shaft so as not to rotate, and a screw portion screwed to the screw shaft A jack comprising: an elevating member that advances and retreats with respect to the support member by being integrally rotated about an axis; and a drive mechanism that is provided at an upper end of the support member and rotates the elevating member. 2. The ring gear, wherein the driving mechanism is rotatably supported by an upper end of the support member, and is fitted into the outer periphery of the elevating member so as to allow relative movement in the axial direction and not to rotate relatively. The jack according to claim 1, further comprising: a drive gear that meshes with and rotates the ring gear; and a motor that is supported by the support member and rotates the drive gear. 3. The support member is formed in a cylindrical shape having a screw shaft supported in an internal space, and the elevating member is formed in a cylindrical shape having a screw portion screwed to the screw shaft at a lower end portion. 3. The jack according to claim 1, wherein the jack is configured to protrude and retract from a cylindrical space formed between the screw shaft and the support member. 4. A window in which the screw shaft is formed of a cylindrical member having a thread on an outer peripheral portion and a limit switch is provided in an inner space thereof, and an operating rod of the limit switch is provided on a peripheral wall of the cylindrical member. The jack according to any one of claims 1 to 3, wherein the limit switch is operated by displacing the operating rod by the elevating member while projecting from the portion. 5. The device according to claim 1, wherein a tapered contact surface is provided in contact with the base member and the support member, and the support member is detachably connected to the base member via the contact surface. Item 5. The jack according to any one of Items 4 to 6. 6. The driving mechanism according to claim 1, further comprising a guide supporting portion provided on an upper portion of the driving mechanism to slidably contact an outer surface of the lifting member to guide and support the lifting member. Jack. 7. It has a shape that can expand and contract in the axial direction, and the upper end is connected to the upper end of the elevating member so as to be relatively rotatable.
The jack according to any one of claims 1 to 6, further comprising a cover having a lower end connected to the support member. 8. A release lever detachably mounted on a shaft or a drive gear of the motor and capable of manually rotating the shaft or the drive gear of the motor to release the supporting force of the lifting member on the work. The jack according to any one of claims 2 to 7, comprising: