JP2005145617A - Hoisting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hoisting tool, superior in safety and operability with a fall prevention mechanism expanding its diameter by free fall to support the bottom of a hollow member while it is hoisted, superior in productivity with simple construction without requiring piping or a motive power source, superior in handling with its compactness and portability, and superior in reliability and operability with a stopper release means wherein the fall prevention mechanism is interlocked with a stopper part and clamping work. <P>SOLUTION: This tool comprises a shaft part inserted in a through hole in the hollow member, and the fall prevention mechanism being disposed at the lower end of the shaft part and supporting the hollow member by abutting on the bottom surface of the hollow member through expansion or increase in diameter. The fall prevention mechanism comprises: a slidable sliding shaft inserted in the shaft; 1 to 6 pieces, preferably 1 to 3 pieces, of fall prevention claws substantially in an L shape with one end rotatably pivoted on the lower end of the shaft; and fall prevention link parts with one end rotatably pivoted on the bent part of the fall prevention claw and with the other end rotatably pivoted on the lower end of the sliding shaft. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lifting jig which is inserted into a through hole of a hollow member of a product or semi-finished product such as a stator case of a motor and lifts and conveys the hollow member.

Conventionally, a hollow member used for a stator case of a motor has been lifted manually or lifted and moved by a wire or the like. However, when the hollow member is heavy, manual work is difficult and there is a problem in safety. In addition, lifting with wires, etc. requires man-hours for attaching and detaching wires, etc., and there is a problem in workability, and since the hollow member must be placed horizontally, it is necessary to prevent the hollow member from rolling, and a wide work space There was a problem that storage space was required.
In order to solve such a problem (Patent Document 1), “a plurality of oscillating blades spaced in the circumferential direction are hinged to the intermediate portion of the shaft via a fixed arm, and on the shaft. The free end of the swing blade is hinged to the tip of the link that is connected to the boss that slides on the shaft and protrudes longer than the fixed arm radially outward relative to the shaft axis, and the other end of the shaft, An annular engagement support device provided with a stopper that restrains the boss from swinging in a state where the link is inclined in a direction away from the fixed arm is disclosed.
Also, (Patent Document 2) states that “an operating shaft that can be operated in the axial direction and an outer peripheral side of the operating shaft that is provided at substantially constant intervals in the circumferential direction. A claw member whose diameter can be expanded in the orthogonal radial direction, and an operating shaft cam portion in which the claw member is expanded in the radial direction by operating the operating shaft in the axial direction and the claw tip engages the inner wall of the paper tube. "A jig for lifting a roll-like body".
JP 2002-192527 A JP 2002-46976 A

However, the above conventional techniques have the following problems.
(1) (Patent Document 1) is one in which a plurality of oscillating blades are expanded and displaced to engage with the inner periphery of an annular body to lift the annular body. Since it engages with the inner circumference of the body, the swing blade and the inner circumference of the annular body cannot be brought into contact with each other. If the annular body is heavy, the inner circumferential surface of the annular body is formed in a cylindrical shape. When there is, it had the subject that it cannot lift.
In (2) (Patent Document 2), the claw member is energized in the radial direction and its claw tip engages with the inner wall of the paper tube to lift the roll-shaped body. Since the joint portion is bitten into the inner wall of the paper tube and is held, there is a problem that the inner wall is damaged. Further, when the inner wall of the roll-shaped body is hard or the roll-shaped body is made of metal and has a weight, there is a problem that the roll-shaped body cannot be held by the claw member and falls.
(3) Both (Patent Document 1) and (Patent Document 2) engage with the inner periphery of the hollow member by expanding the diameter of the oscillating blade and the claw member, and lift and move the hollow member. There is a problem of lack of safety and reliability due to lack of a fall prevention function that reliably supports the bottom of the steel.

  The present invention solves the above-mentioned conventional problems, and has a fall prevention mechanism that supports the bottom of a hollow member such as a stator case of a motor. By using a drop prevention mechanism that expands due to natural fall when the hollow member is lifted, it has excellent operability and does not require air or electricity, so it does not require piping or a power source and has a simple structure. Lifting treatment that is highly productive, compact and easy to handle, easy to carry and has excellent workability, and has a stopper mechanism and a stopper release mechanism that interlocks with the clamping work. The purpose is to provide ingredients.

In order to solve the above problems, the lifting jig of the present invention has the following configuration.
A lifting jig according to claim 1 of the present invention is a lifting jig for lifting a hollow member of a product or semi-finished product having a circular or rectangular through hole, and is inserted through the through hole of the hollow member. And a fall prevention mechanism that is disposed at a lower end of the shaft part and abuts against a bottom surface of the hollow member by expanding the diameter to support the hollow member, and the fall prevention mechanism includes the shaft part. A sliding shaft that is inserted into the shaft portion and is slidable in the axial direction of the shaft portion, an arm portion disposed at the lower end of the shaft portion, and one end pivotally pivoted at the lower end of the arm portion. One to six, preferably one to three, substantially L-shaped drop prevention claws, one end pivotably pivoting on the bent portion of the fall prevention claw, and the other end on the lower end of the sliding shaft And a fall-preventing link that is pivotally pivoted. .
This configuration has the following effects.
(1) A fall prevention mechanism disposed at the lower end of the shaft portion is pivotally pivoted to the lower end of the arm portion by sliding a slide shaft inserted in the shaft portion in the axial direction of the shaft portion. Because it has a link mechanism that reduces and expands the substantially L-shaped drop prevention claw, the slide shaft is moved to the upper end, and the fall prevention claw is reduced in diameter by the link mechanism and stored inside the arm part The fall prevention mechanism can be inserted into the through-hole without damaging the inner peripheral surface of the hollow member, and the fall prevention claw can be easily removed from the arm by the link mechanism simply by freely dropping the slide shaft after insertion. The diameter of the hollow member can be increased by rotating it in the direction of contact, and the hollow member can be reliably supported by being lifted and hung by being brought into contact with the bottom surface of the hollow member.
(2) Since the weight of the hollow member is applied to the fall prevention claw when the fall prevention claw is expanded, the link mechanism of the fall prevention mechanism works to prevent the fall prevention claw from rotating in the reduced diameter direction. The bottom of the hollow member is supported and can be lifted, suspended, and moved. After movement, the fall prevention pawl is rotated inward by the link mechanism simply by sliding the slide shaft upward. Thus, the diameter can be reduced, and the hollow member can be placed at a desired position.
(3) By dropping the sliding shaft, the fall prevention claw is rotated by the link mechanism so as to increase in diameter from the center side to the outer periphery of the hollow member. The fall prevention claw can be inserted from the gap, and the bottom surface of the hollow member can be reliably supported.

Here, a suspension part such as an eyebolt formed in an annular shape may be disposed at the upper end of the shaft part. The suspension part can be reliably grasped and lifted, and a heavy hollow member can be lifted by connecting a crane or the like to the suspension part, resulting in excellent workability and versatility.
In addition, you may arrange | position buffer members, such as foaming urethane and rubber | gum which are formed larger than a through-hole in a shaft part and fit in a through-hole, on the outer periphery of a shaft part. Thereby, when the hollow member is placed directly on the floor surface or the like, the shaft portion can be inserted into the through hole of the hollow member without damaging the inner peripheral surface or the outer wall of the hollow member. The hollow member can be lifted by frictional force by fitting the buffer member into the through hole, and after the gap is formed between the bottom surface of the hollow member and the floor surface, the bottom surface of the hollow member is supported by the fall prevention mechanism. Can be lifted, suspended and moved.
Moreover, you may form the shaft part itself so that expansion-contraction is possible. Thereby, it can adjust to the height of a hollow member easily, is excellent in versatility, and is compact and excellent in storage property when not in use.
The number of fall prevention claws provided in the fall prevention mechanism is 1 to 6, preferably 1 to 3. Having one or more fall prevention claws can support the bottom surface of the hollow member, and as it becomes more than three, the number of parts increases and lacks productivity, and the fall prevention mechanism becomes large and lacks versatility. There is a tendency, and the tendency becomes remarkable as the number exceeds 6, which is not preferable.

The length of the fall prevention claw is formed to be longer than at least the maximum diameter of the through hole of the hollow member. Thereby, even if the shaft part and the center of the through hole are misaligned, the fall-preventing claw can be reliably brought into contact with the bottom surface of the hollow member, and the hollow member can be supported, so that workability and reliability are excellent.
The tip bottom side of the fall prevention claw is preferably formed in an arc shape. Thereby, at the time of rotation of a fall prevention nail | claw, a buffer with a floor surface etc. can be prevented, rotation operation | movement can be stabilized, and damage to a fall prevention nail | claw can be prevented.
An elastic member such as rubber is attached to the contact surface of the fall prevention claw with the hollow member. Thereby, it is excellent in reliability, without damaging a hollow member. Moreover, you may form a taper part, a level | step-difference part, and a notch part according to the shape of a hollow member in the contact part with the hollow member of a fall prevention nail | claw. Thereby, the corner part which consists of the inner peripheral surface and bottom face of a hollow member can be hold | maintained, and since a fall prevention nail | claw and a hollow member can be more reliably latched and a hollow member can be supported, a rocking | fluctuation etc. of a hollow member etc. It is excellent in stability at the time of lifting or moving and is preferable.
Also, the arm part that is arranged at the lower end of the shaft part and pivots so that the fall-preventing claw can pivot is a fall-preventing link part pivoted on the lower end of the sliding shaft when the diameter of the fall-preventing claw is reduced, and its link support It is formed so that a link mechanism such as a portion can be stored. When not in use, the fall-preventing link part and the pivot part of the fall-preventing claw are housed in a storage part covered by the arm part, so that they are protected from external impacts and are prevented from being damaged. It is possible to prevent the fall-preventing claw or the like from coming into contact with the inner peripheral surface of the hollow member and damaging it when it is inserted into the through-hole, and is excellent in reliability. An elastic member such as rubber is attached to the outer periphery of the arm portion so as not to damage the inner peripheral surface of the hollow member.
When an operating lever is provided on the sliding shaft, the operating shaft can be easily slid up and down by gripping the operating lever, and the fall prevention claw can be operated to reduce or expand its diameter. Excellent.

Invention of Claim 2 is the lifting jig of Claim 1, Comprising: The said fall prevention mechanism has the structure provided with the stopper part which fixes the said sliding shaft to the said shaft part. Yes.
With this configuration, in addition to the operation of the first aspect, the following operation is provided.
(1) Since the fall prevention mechanism includes a stopper portion that fixes the slide shaft to the shaft portion, the slide shaft is lowered or the fall prevention claw is expanded in diameter other than when the hollow member is lifted. Therefore, when the lifting jig is inserted into and removed from the through hole of the hollow member, it is possible to reliably prevent the fall prevention mechanism from being damaged and the inner peripheral surface of the hollow member from being damaged.
(2) Since the fall prevention mechanism has a stopper portion that prevents the slide shaft from sliding, the slide shaft can be freely dropped by the weight of the fall prevention mechanism simply by releasing the stopper portion when the hollow member is lifted. The fall prevention claw automatically expands by the link mechanism, and the hollow member can be reliably supported.

Here, as the stopper portion, an operation lever or the like disposed on the sliding shaft is locked in a locking groove formed in the radial direction of the shaft portion, or a through hole formed in the shaft portion and the sliding shaft. Anything that can prevent the sliding shaft from dropping, such as a pin that inserts a pin or the like, or a latch type that locks the convex portion disposed on the shaft portion into the concave portion formed on the sliding shaft, may be used. When the operating lever is projected from a locking groove such as an inverted L-shape formed on the shaft portion, locking by the operating lever and sliding of the sliding shaft can be easily performed, and the operability is excellent. In particular, when the fall prevention mechanism is enlarged in order to lift a heavy hollow member, a method of inserting a pin into a through hole formed in the shaft portion and the sliding shaft is preferably used. Thereby, the weight of a sliding shaft and a fall prevention mechanism can be supported on both sides of a pin, and it is excellent in durability.
In order to allow the sliding shaft of the fall prevention mechanism to fall freely, a weight may be provided at the lower portion of the sliding shaft. By using free fall, piping and power sources such as air and electricity are not required, and the structure is simple and the productivity is excellent.

Invention of Claim 3 is a lifting jig of Claim 1 or 2, Comprising: The said shaft part expand | swells or expands in the said through-hole of the said hollow member, and the inner periphery of the said hollow member It has the structure provided with the clamp part engaged with a surface.
With this configuration, in addition to the operation of the first or second aspect, the following operation is provided.
(1) Since the shaft portion includes a clamp portion that expands or expands in the through hole of the hollow member and engages with the inner peripheral surface of the hollow member, the hollow member is placed directly on the floor surface or the like. Even in this case, the clamp member can be brought into contact with the inner peripheral surface of the hollow member and the hollow member can be held by frictional force, so that the hollow member is lifted to leave a gap between the bottom surface and the floor surface of the hollow member. After emptying, the bottom surface of the hollow member can be supported by the fall prevention mechanism, and the hollow member can be lifted, suspended and moved easily and reliably.
(2) Since the shaft portion includes a clamp portion that expands or expands and engages with the inner peripheral surface of the hollow member, the center alignment of the shaft portion and the through hole can be automatically performed, and reliably The bottom surface of the hollow member can be supported by the fall prevention mechanism.
(3) By including a clamp portion that engages with the inner peripheral surface of the hollow member and a fall prevention mechanism that supports the bottom surface of the hollow member, the clamp is released due to wear of the clamp portion and the hollow member slides downward. In addition, since the hollow member can be supported by the fall prevention mechanism and the fall can be prevented, the transport reliability and reliability are further improved.

Here, as a mechanism of the clamp part, in addition to the balloon-like one that expands inside the through hole, the engagement part such as a clamp piece expands and comes into contact with the inner peripheral surface of the hollow member, and the hollow member is moved by frictional force. What hold | maintains is used suitably. For example, a three-claw or four-claw chuck such as a collet chuck method or a toggle clamp method, a fan plate opening / closing method using an arc groove, a rubber holding jig, or the like can be used. The fan-plate opening and closing method using an arc groove is a fan-like support portion that is slidably fitted in an arc groove formed in a spiral shape on the surface of the substrate portion by rotating the disc-like substrate portion in the plane. To increase the diameter. In any case, the outer diameter of the clamp part after expansion or diameter expansion is formed in advance approximately equal to the diameter of the through hole of the hollow member, so that the engaging part and the inner peripheral surface of the hollow member are brought into surface contact for lifting. The required frictional force can be obtained, the hollow member can be held, and the center position of the shaft portion and the through hole can be automatically aligned.
Compared to the collet chuck method that requires a hydraulic source, air source, screw feed mechanism, etc., the toggle clamp method has a simple structure and is excellent in productivity and workability.

  The clamping operation by the clamping part and the releasing operation of the stopper part of the fall prevention mechanism may be interlocked. As a mechanism for linking the clamping work by the clamp part and the release operation of the stopper part of the fall prevention mechanism, for example, a pin of the stopper part is arranged at one end of the clamp lever of the clamp part, and the clamp lever can be rotated. Along with this, a pin is removed from a through hole formed in the shaft portion and the sliding shaft, or a pressing member is provided at one end of the clamp lever, and the shaft portion is attached to the shaft portion as the clamp lever is turned. Examples include those that release the locking by pressing or rotating the convex portion of the locked sliding shaft, the operating lever, or the like. As a result, the stopper part of the fall prevention mechanism is released at the same time as the clamping work is performed, and the slide shaft automatically descends, and the fall prevention claw is expanded with the lifting of the hollow member, and the bottom part of the hollow member is removed. Since it can be supported, the operability and certainty can be improved and the reliability is excellent.

Invention of Claim 4 is the lifting jig | tool of Claim 3, Comprising: The said clamp part is penetrated by the said shaft part, The cylindrical part which latches the said clamp part to the said shaft part, The said, One or more fixed clamp pieces disposed on the cylindrical portion and abutting the inner periphery of the hollow member, and one end pivotally pivoted to the lower portion of the cylindrical portion and the other end on the inner peripheral surface of the hollow member A clamp link portion provided with an abutting engagement clamp piece, a clamp lever pivoted at one end on the upper portion of the cylindrical portion, and one end pivoted at the clamp link portion. Is provided with an upper link portion pivoted on the clamping lever to rotate the clamping link portion by the rotation of the clamping lever.
With this configuration, in addition to the operation of the third aspect, the following operation is provided.
(1) The clamp part includes a cylindrical part that locks the clamp part on the shaft part, one or more fixed clamp pieces that are disposed on the cylindrical part and contact the inner periphery of the hollow member, and one end of the clamp part A clamping link portion pivotally pivoted and having an engagement clamp piece abutting against the inner peripheral surface of the hollow member at the other end, a clamping lever pivotally pivoted on the cylindrical portion, and one end And an upper link portion pivoted by the clamp link portion and the other end pivoted by the clamp lever, so that the clamp link portion can be rotated via the upper link portion by rotating the clamp lever. The engagement clamp piece disposed on the clamp link portion can be brought into contact with the inner peripheral surface of the hollow member, and the hollow member can be lifted by holding the hollow member by frictional force together with the fixed clamp piece. It can be carried out.
(2) By providing the upper link part that rotates and expands the diameter of the clamp link part by rotating the clamp lever, the clamp link part remains expanded unless the clamp lever is rotated in the reverse direction. Thus, the state in which the engagement clamp piece is pressed against the inner peripheral surface of the hollow member can be maintained, and the reliability is excellent.
(3) By arranging one or more fixed clamp pieces arranged in the cylindrical part of the clamp part in accordance with the diameter or shape of the through hole, the shaft can be simply brought into contact with the inner periphery of the hollow member. The center position of the through hole of the hollow member and the hollow member can be adjusted, and the clamping lever can be easily engaged with the inner peripheral surface of the hollow member by rotating the clamp lever. Can be held.

Here, when there is one fixed clamp piece, it is arranged at a position facing the clamp link portion where the engagement clamp piece is arranged. As a result, when the diameter of the clamp link portion is expanded and the engagement clamp piece is brought into contact with the inner peripheral surface of the hollow member, the fixed clamp piece and the engagement clamp piece are surely placed between the inner peripheral surface of the hollow member. It can be clamped by applying frictional force. When a plurality of fixed clamp pieces are arranged radially, even a heavy hollow member or a hollow member having a through-hole other than a circle can be lifted in a well-balanced manner and excellent in stability. Further, a plurality of clamp link portions whose diameter is increased by rotating the clamp lever may be provided.
The fixed clamp piece and the engagement clamp piece that are in contact with the inner peripheral surface of the hollow member are formed of an elastic member such as rubber, or an elastic member such as rubber is attached to the contact surface with the hollow member. Thereby, it is excellent in reliability, without damaging the internal peripheral surface of the hollow member which contacts a fixed clamp piece or an engagement clamp piece. Also, by increasing the coefficient of friction of the surface of the fixed clamp piece or engagement clamp piece that comes into contact with the inner peripheral surface of the hollow member or the elastic member attached to them, the hollow member slides down during clamping. It is possible to prevent the hollow member and the fall prevention mechanism from colliding with each other and preventing the hollow member and the fall prevention mechanism from being damaged or damaged.

Invention of Claim 5 is the lifting jig of Claim 3 or 4, Comprising: The said clamp part is arrange | positioned slidably in the axial direction of the said cylindrical part, The upper surface of the said hollow member, / It has the structure provided with the guide part which contact | abuts to an internal peripheral surface and aligns the said clamp part and the said hollow member.
With this configuration, in addition to the operation of the third or fourth aspect, the following operation is provided.
(1) Since the clamp portion includes a guide portion that comes into contact with the upper surface of the hollow member, it can be easily positioned in the height direction according to the height of the hollow member, and is lifted when working with a crane or the like. The upper surface guide portion serves as a stopper when the hoist is lowered, and the lifting jig is not lowered too much, and the fall preventing mechanism can be prevented from coming into contact with the floor surface and being damaged.
(2) Since the clamp portion includes a guide portion that comes into contact with the inner peripheral surface of the hollow member in accordance with the diameter of the through hole, the center position of the shaft portion and the through hole of the hollow member can be easily aligned. Further, the bottom surface of the hollow member can be supported by the fall prevention mechanism.
(3) Since the guide part for aligning the clamp part and the hollow member is slidably arranged in the axial direction of the cylindrical part, the position of the clamp part is adjusted according to the height of the hollow member. Can be excellent in versatility.

  Here, the position of the guide portion is set according to the height of the hollow member to be lifted and the size of the through hole. By arranging the position of the guide portion so as to be adjustable in the height direction and the radial direction, even if the height of the hollow member and the size and shape of the through hole are different, it can be easily handled, and the versatility is excellent. When the guide portion is formed in an L shape, positioning can be performed with respect to both the upper surface and the inner peripheral surface with one member. By fixing the guide portion to the long hole by screwing or the like, the position can be easily adjusted or maintenance such as replacement can be performed. Moreover, it can also be made to respond | correspond to the magnitude | size and shape of a through-hole by making a guide part replaceable. In addition, elastic members, such as rubber | gum, are stuck to a guide part so that an upper surface and an internal peripheral surface of a hollow member may not be damaged.

A sixth aspect of the present invention is the lifting jig according to any one of the third to fifth aspects, wherein the clamp portion is slidably fixed in the axial direction of the shaft portion. It has the structure provided with the mechanism.
With this configuration, in addition to the operation of any one of claims 3 to 5, the following operation is provided.
(1) By providing a height adjustment mechanism that slidably fixes the clamp portion in the axial direction of the shaft portion, the clamp portion and the fall prevention mechanism can be aligned with the height of the hollow member to be lifted. The hollow member can be reliably clamped, and the bottom of the hollow member can be supported by the fall prevention mechanism.
Here, as the height adjustment mechanism, a latch type mechanism that fits and fixes the convex portion disposed in the clamp portion to the concave portion formed in the shaft portion, and a male screw and a female screw are formed in the shaft portion and the clamp portion, respectively. For example, a segment gear system may be used. In the case of the latch type, the height can be easily adjusted by forming a plurality of recesses in the longitudinal direction of the shaft, and in the case of a threaded male screw and female screw, or in the case of a segment gear system, fine height adjustment is possible. It can be carried out.

The invention according to claim 7 is the lifting jig according to any one of claims 4 to 6, comprising: a. An inverted L-shaped locking groove having a locking portion formed in the radial direction of the shaft portion and a sliding portion formed in the axial direction, and the locking groove disposed on the sliding shaft A stopper portion provided with an operating lever projecting from b. A pressing member projecting from the side of the clamping lever; a sliding member that is connected to the contacting portion that contacts the pressing member and slides together with the contacting portion by the rotation of the clamping lever; A pivoting pawl pivotally pivoted on the sliding member by a pivotal portion, a sliding guide portion connected to the tubular portion of the clamp portion and through which the sliding member is inserted, and the sliding guide A sliding spring disposed inside the portion and pressing the sliding member in the axial direction; and a connecting rod connected to the sliding shaft and pressed by the rotating claw to rotate the sliding shaft. And a stopper release means.
With this configuration, in addition to the operation of any one of claims 4 to 6, the following operation is provided.
(1) A stopper portion is disposed on the sliding shaft and an inverted L-shaped locking groove having a locking portion formed in the radial direction of the shaft portion and a sliding portion formed in the axial direction. Because it has an operating lever that protrudes from the locking groove, it can be locked to the locking part by simply pulling up and rotating the operating lever along the sliding part, preventing free fall of the sliding shaft. It is possible to prevent the fall prevention claw of the fall prevention mechanism from expanding when not in use. In addition, the stopper can be released simply by rotating the operating lever from the locking part to the sliding part during use, the sliding shaft can be lowered, and it is prevented from dropping when the hollow member is lifted The fall prevention claw of the mechanism can expand the diameter and support the hollow member.
(2) By having a sliding member that slides together with the contact portion by the rotation of the clamping lever, and a connecting rod that is pressed by the rotating claw disposed on the sliding member and rotates the sliding shaft. The sliding shaft can be rotated in conjunction with the clamping work by the clamping lever, and the operation lever position of the stopper can be moved from the locking part of the locking groove to the sliding part. The stopper part can be released.
(3) When the fall prevention mechanism is released by the operation lever after the hollow member is moved, the sliding member remains pressed by the pressing member disposed on the clamping lever. The operating lever can be rotated without contact with each other, and the operating lever can be locked to the locking portion, and the sliding shaft can be fixed to the shaft portion.
(4) Since there is a sliding spring that presses the sliding member in the axial direction inside the sliding guide part, the restoring force of the sliding spring can be obtained simply by releasing the clamp of the clamping part by rotating the clamping lever. Thus, the sliding member can be slid along the sliding guide portion, and can be automatically returned to the initial position.
(5) Since the rotating claw is pivotally pivoted to the sliding member by the pivot part, when the clamp part is released, the sliding member slides and the rotating claw contacts the connecting rod. Even if it does not get caught, it can be reliably returned to the initial position.
(6) By connecting the sliding guide portion through which the sliding member is inserted to the cylindrical portion of the clamp portion, the clamp portion and the stopper release means can be integrated, and the clamp portion is moved by the height adjusting mechanism. Even when moved, the stopper can be reliably released in conjunction with the clamping operation.

Here, a torsion coil spring, a leaf spring, or the like is disposed on the pivot portion of the rotation claw so as to urge the rotation claw toward the sliding shaft. As a result, the pivoting pawl can be pivoted so that when the clamp is released, when the sliding member slides and the pivoting pawl comes into contact with the connecting rod, the pivoting pawl is once on the sliding guide section side. Then, it automatically returns to the sliding shaft side and comes into contact with the connecting rod to prepare for the next stopper release operation.
The sliding guide portion is formed in a hollow shape, and the end portion on the side facing the opening side through which the sliding member is inserted is closed. The sliding spring is supported by the closed end portion of the sliding guide portion to urge and slide the sliding member. The end of the sliding member may be brought into direct contact with the end of the sliding spring, or the protrusion formed on the outer periphery of the sliding member by inserting the end of the sliding member into the sliding spring. You may make it contact | abut to the edge part of a sliding spring.
The connecting rod is directly connected to the sliding shaft, protrudes from the opening formed in the shaft portion, and rotates and slides with the sliding shaft, or is suspended from the rotating ring extrapolated to the shaft portion. It can be rotated. When the connecting rod is suspended from the rotating ring, the rotating lever rotates via the operating lever by inserting the operating lever arranged on the sliding shaft through the operating lever insertion hole drilled in the side of the rotating ring. Transmitted to the sliding shaft, and the sliding shaft can be rotated.

As described above, according to the lifting jig of the present invention, the following advantageous effects can be obtained.
According to invention of Claim 1, it has the following effects.
(1) Since the slide shaft inserted in the shaft portion slides in the axial direction of the shaft portion, it has a link mechanism for reducing and expanding the fall prevention claw pivoted on the lower end of the arm portion. The fall prevention mechanism is inserted into the through-hole without damaging the inner peripheral surface of the hollow member in a state in which the moving shaft is moved to the upper end and the fall prevention claw is reduced in diameter by the link mechanism and stored inside the arm portion. The slide mechanism can be easily dropped by simply dropping the slide shaft freely after insertion, and the fall prevention claw can be rotated outwardly from the arm portion by the link mechanism to increase the diameter and contact the bottom surface of the hollow member. It is possible to provide a lifting jig excellent in reliability and operability that can be lifted, suspended and moved while being supported.
(2) Since the weight of the hollow member is applied to the fall prevention claw when the fall prevention claw is expanded, the link mechanism of the fall prevention mechanism works to prevent the fall prevention claw from rotating in the reduced diameter direction. Supports the bottom surface of the hollow member to lift, suspend and move, providing excellent reliability. After movement, the link mechanism simply slides the slide shaft upward to prevent it from falling inward of the arm. It is possible to provide a lifting jig that is capable of rotating the claw to reduce the diameter and that is capable of placing the hollow member at a desired position and that is excellent in functionality and workability.

According to invention of Claim 2, in addition to the effect of Claim 1, it has the following effects.
(1) Since the stopper portion is provided, the slide shaft does not descend or the drop prevention claw does not expand except when the hollow member is lifted. When inserting or removing a tool, it is possible to reliably prevent damage to the fall prevention mechanism or damage to the inner peripheral surface of the hollow member, which is excellent in reliability and safety, and is a stopper when lifting the hollow member. Lifting with excellent operability and reliability that allows the sliding shaft to drop freely just by releasing the part, and the fall prevention claw to automatically expand its diameter by the link mechanism to reliably support the hollow member A jig can be provided.
(2) The fall prevention claw can be expanded by the link mechanism simply by dropping the sliding shaft freely with its own weight, so there is no need for piping such as air or electricity or a power source, and the structure is simple. Can provide a lifting jig with excellent productivity.

According to invention of Claim 3, in addition to the effect of Claim 1 or 2, it has the following effects.
(1) Even when the hollow member is placed vertically on the floor surface or the like, the hollow member can be held and lifted by the frictional force of the clamp portion, and a gap is formed between the bottom surface of the hollow member and the floor surface. A lifting jig with excellent versatility and functionality that can support the bottom surface of the hollow member with a fall prevention mechanism after it is opened, and can easily and reliably lift, suspend and move the hollow member. Can be provided.
(2) The center position of the shaft and the through hole can be automatically adjusted, and the bottom of the hollow member can be reliably supported by the fall prevention mechanism, providing a lifting jig with excellent workability and reliability. can do.
(3) By including a clamp portion that engages with the inner peripheral surface of the hollow member and a fall prevention mechanism that supports the bottom surface of the hollow member, the clamp is released due to wear of the clamp portion and the hollow member slides downward. In addition, it is possible to provide a lifting jig that can support the hollow member by the fall prevention mechanism and can prevent the fall and has excellent reliability and reliability of conveyance.

According to invention of Claim 4, in addition to the effect of Claim 3, it has the following effects.
(1) The clamp link portion can be rotated via the upper link portion by rotating the clamp lever, and the engagement clamp pieces disposed on the fixed clamp piece and the clamp link portion are respectively hollow members. It is possible to provide a lifting jig excellent in operability that can be engaged with the inner peripheral surface of the hollow member and lift the hollow member by frictional force.
(2) By providing the upper link part that rotates and expands the diameter of the clamp link part by rotating the clamp lever, the clamp link part remains expanded unless the clamp lever is rotated in the reverse direction. Thus, it is possible to provide a lifting jig with excellent reliability capable of maintaining the state in which the engagement clamp piece is pressed against the inner peripheral surface of the hollow member.
(3) The center position of the shaft part and the through hole of the hollow member is aligned by arranging one or more fixed clamp pieces arranged in the cylindrical part of the clamp part according to the diameter and shape of the through hole in advance. It is excellent in workability, can be easily engaged with the inner peripheral surface of the hollow member by rotating the clamp lever, and has excellent reliability that can hold the hollow member A lifting jig can be provided.

According to invention of Claim 5, in addition to the effect of Claim 3 or 4, it has the following effects.
(1) The guide portion that comes into contact with the upper surface and / or inner peripheral surface of the hollow member can be easily positioned in the height direction and the horizontal direction according to the height of the hollow member and the size of the through hole. It is possible to prevent the drop prevention mechanism from coming into contact with the floor surface and damaging it without causing the lifting jig to descend too much when working with a crane or the like. A lifting jig with excellent reliability that can be supported can be provided.
(2) It is possible to provide a lifting jig with excellent versatility that can slide the guide portion in the axial direction according to the height of the hollow member and adjust the position with the clamp portion.

According to invention of Claim 6, in addition to the effect of any one of Claims 3 thru | or 5, it has the following effects.
(1) The height adjustment mechanism can align the clamp part and the fall prevention mechanism in accordance with the height of the hollow member to be lifted, and can securely clamp the hollow member. A reliable lifting jig that can support the bottom of the hollow member can be provided.

According to invention of Claim 7, in addition to the effect of any one of Claims 4 thru | or 6, it has the following effects.
(1) A stopper portion is disposed on the sliding shaft and an inverted L-shaped locking groove having a locking portion formed in the radial direction of the shaft portion and a sliding portion formed in the axial direction. Because it has an operating lever that protrudes from the locking groove, it can be locked to the locking part by simply pulling up and rotating the operating lever along the sliding part, preventing free fall of the sliding shaft. In addition, it is possible to provide a highly reliable lifting jig that can prevent the drop prevention claw of the drop prevention mechanism from expanding when not in use.
(2) By having a sliding member that slides together with the contact portion by the rotation of the clamping lever, and a connecting rod that is pressed by the rotating claw disposed on the sliding member and rotates the sliding shaft. The sliding shaft can be rotated in conjunction with the clamping work by the clamping lever, and the operation lever position of the stopper can be moved from the locking part of the locking groove to the sliding part. At the same time, it is possible to provide a lifting jig excellent in functionality and reliability capable of releasing the stopper portion.
(3) Since there is a sliding spring that presses the sliding member in the axial direction inside the sliding guide part, the restoring force of the sliding spring can be obtained simply by releasing the clamp of the clamping part by turning the clamping lever. The sliding member can be slid along the sliding guide portion, and the rotating claw is pivoted to the sliding member by the pivot portion so that the rotating claw contacts the connecting rod. It is possible to provide a lifting jig with excellent operability and certainty that can be automatically returned to the initial position without being caught.
(4) Since the sliding guide portion through which the sliding member is inserted is connected to the cylindrical portion of the clamp portion, the clamp portion and the stopper releasing means can be integrated, and the clamp portion is moved by the height adjusting mechanism. Even when moved, it is possible to provide a lifting jig with excellent certainty that can be reliably released in conjunction with the clamping operation.

Hereinafter, a lifting jig according to an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1A is a developed sectional view of a main part of a lifting jig according to Embodiment 1 of the present invention, and FIG. 1B is a partially broken side view of the lifting jig according to Embodiment 1 of the present invention. is there.
In FIG. 1, 1 is a lifting jig, 2 is a cylindrical portion that is formed into a cylindrical shape and is inserted into a through hole of a hollow member, 3 is a fall prevention mechanism disposed at the lower end of the shaft portion 2, and 4 is a shaft portion 2. The slide shaft 5 of the fall prevention mechanism 3 slidably inserted into the shaft portion 5 is formed in a substantially L shape, and the pivot portion on the lower end side of the arm portion 6 having one end portion 5 a disposed at the lower end of the shaft portion 2. The fall prevention claw pivoted by 6a is pivotable, 5b is a notch formed in a step shape at the other end of the fall prevention claw 5, and 7 is a pivot part 7a at one end of the bent portion 5c of the fall prevention claw 5. The link prevention portion pivotally pivoted by the pivot portion 7 b to the link support portion 8 pivotally pivoted by the pivot shaft and having the other end loosely fitted to the lower end of the sliding shaft 4, 9 is attached to the shaft portion 2. A clamp portion 9 a is locked to the upper portion of the shaft portion 2 by the inserted cylindrical portion 10. A height adjusting pin for slidably fixing the clamp portion 9 in the axial direction of the shaft portion 2 by being fitted into one or more fitting holes 9b formed in the shaft portion 2, A fixed clamp piece disposed in the tubular portion 10, 11 a is an elastic contact member such as a rubber sheet attached to the surface of the fixed clamp piece 11, and 12 is an upper surface guide portion disposed in the tubular portion 10, Reference numeral 14 is a clamp link part pivoted to the lower support part 13 of the cylindrical part 10 by a pivot part 13a, and 15 is an engagement member made of an elastic member disposed at the other end of the clamp link part 14. The clamp piece 16 has one end pivoted to the upper support portion 17 of the tubular portion 10 so as to be pivotable by the pivot portion 17a, and the other end 18 is pivoted to the clamp link portion 14 by the pivot portion 18a. End is clamp lever 6 is an upper link portion that is pivoted by a pivot portion 18b and rotates the clamp link portion 14 by the rotation of the clamp lever 16, and 19 is an inverted L-shaped locking groove 20 formed in the shaft portion 2. A stopper portion provided with an operating lever 21 disposed on the sliding shaft 4 and protruding from the locking groove 20, 20 a is a locking portion of the locking groove 20 where the operating lever 21 is locked, and 20 b is an operating lever 21. Slidable portion 20 of the locking groove 20 on which is slidable, 22 is a suspension portion such as an eyebolt, which is disposed on the upper portion of the shaft portion 2 and is connected to a crane or the like.
When not in use, the sliding shaft 4 is pulled up above the shaft portion 2 by the operating lever 21 and is fixed by locking the operating lever 21 to the locking portion 20 a of the locking groove 20. Since the slide shaft 4 is loosely fitted to the link support portion 8, the slide shaft 4 can be rotated by the operation lever 21. In the unused state, the fall prevention claw 5 of the fall prevention mechanism 3 is rotated to the sliding shaft 4 side by the fall prevention link portion 7 and stored in the arm portion 6. Further, the fall prevention link portion 7 and the link support portion 8 are also covered with the arm portion 6, so that they are protected from external impact and are prevented from being damaged.
Although only one fitting hole 9b is shown in the figure, a plurality of fitting holes 9b are formed in the longitudinal direction of the shaft portion 2, and the height adjustment pin 9a is fitted to align the clamp portion 9.

FIG. 2 is a cross-sectional developed view of a main part showing the usage state of the lifting jig in the first embodiment of the present invention, FIG. 3A is a plan view showing the usage state of the lifting jig in the first embodiment of the present invention, FIG.3 (b) is a bottom view which shows the use condition of the lifting jig | tool in Embodiment 1 of this invention.
2 and 3, reference numeral 25 denotes a hollow member such as a stator case of a motor that is formed in a substantially cylindrical shape and is lifted by the lifting jig 1, and 25 a is a shaft portion 2 of the lifting jig 1 that is formed in the center of the hollow member 25. 25b is supported by the fall prevention claw 5 of the fall prevention mechanism 3 and 25c is the inner peripheral surface of the hollow member 25 with which the elastic contact member 11a of the fixed clamp portion 11 and the engagement clamp piece 15 are engaged. The bottom surface 25 d of the hollow member 25 is the top surface of the hollow member 25 with which the upper surface guide portion 12 of the clamp portion 9 abuts.
By having the notch portion 5b at the tip of the fall prevention claw 5, it can be locked to the inner peripheral surface 25b and the bottom surface 25c of the hollow member 25 to ensure the lifting.
The fall prevention claws 5 of the fall prevention mechanism 3 are arranged at three locations equally divided by 120 degrees on the circumference, and the clamp portion 9 is provided with two fixed clamp pieces 11 and an upper surface guide portion 12 for clamping. With respect to the engagement clamp piece 15 of the link part 14 for use, it arrange | positioned equally every 120 degree | times on the circumference. By arranging the fall prevention claw 5, the fixed clamp piece 11 and the engagement clamp piece 15 equally on the circumference, the weight of the hollow member 25 can be evenly distributed and the hollow member 25 can be held in a well-balanced manner. Therefore, stabilization at the time of lifting is aimed at.
The number of the fall-preventing claws 5, the fixed clamp pieces 11 and the engagement clamp pieces 15 and the positions at which they are arranged are changed according to the weight of the hollow member 25, the shape of the through hole 25a, etc., regardless of this embodiment. can do.

The usage method of the lifting jig in Embodiment 1 is demonstrated using FIG. 1 thru | or FIG.
As shown in FIG. 1, the clamp lever 16 is positioned upward and the engagement clamp piece 15 is reduced in diameter, and the operation lever 21 is locked to the locking portion 20a of the locking groove 20 to prevent the fall. It is confirmed that the claw 5 has a reduced diameter and is housed inside the arm portion 6. Next, the clamp portion 9 is slid in accordance with the height of the hollow member 25, and the height adjusting pin 9 a is inserted into the fitting hole 9 b of the shaft portion 2 to fix the clamp portion 9.
The shaft portion 2 of the lifting jig 1 is inserted into the through hole 25a until the upper surface guide portion 12 contacts the upper surface 25d of the hollow member 25, and the elastic contact member 11a of the fixed clamp piece 11 is the inner peripheral surface 25b of the hollow member 25. Check that it is in contact with
By rotating the clamp lever 16 downward, the clamp link portion 14 is rotated and expanded in diameter by the upper link portion 18, and the engagement clamp piece 15 disposed at the end of the clamp link portion 14 is formed. The hollow member 25 is in contact with and clamped in parallel with the inner peripheral surface 25 b of the hollow member 25. Thereafter, the operating lever 21 is moved to the position of the sliding portion 20b of the locking groove 20, and after the sliding shaft 4 is slidable, the hollow member 25 is raised from the floor to about 30 mm.
By raising the hollow member 25, the sliding shaft 4 freely falls, and the fall prevention claw 5 expands to the outside of the arm portion 6 by the action of the fall prevention link portion 7. In order to reliably support the bottom surface 25c of the hollow member 25 by the fall prevention claw 5, it is confirmed that the operation lever 21 is pushed down to the lower end, and the hollow member 25 is lifted and moved.
After the hollow member 25 is moved, the hollow member 25 is lowered to a height of about 30 mm from the floor surface, and the operation lever 21 is lifted up to the upper end of the sliding portion 20b of the locking groove 20 and locked to the locking portion 20a. As a result, the sliding shaft 4 rises and the drop prevention claw 5 is reduced in diameter toward the inside of the arm portion 6 by the action of the drop prevention link portion 7, and the fall prevention mechanism 3 is accommodated in the through hole 25 a of the hollow member 25. Therefore, it is lowered until the bottom surface 25c of the hollow member 25 contacts the floor surface.
By rotating the clamp lever 16 upward, the clamp link portion 14 provided with the engagement clamp piece 15 is rotated by the upper link portion 18 to reduce the diameter, and the clamp is removed. The work is finished by lifting the hole from the through hole 25a of the hollow member 25.
In addition, by connecting a crane etc. to the suspension part 22 arrange | positioned at the upper part of the shaft part 2, work is labor-saving, and even the heavy hollow member 25 is easily lifted, it hangs and moves.
When the lifting jig 1 is not used, it is stored without applying a load to the fall prevention mechanism 3 or the clamp portion 9 by hooking the suspension portion 22 on a hook or the like.

As described above, since the lifting jig according to the first embodiment is configured, it has the following effects.
(1) The fall prevention mechanism 3 disposed at the lower end of the shaft portion 2 slides the slide shaft 4 inserted in the shaft portion 2 in the axial direction of the shaft portion 2, thereby causing the lower end of the arm portion 6 to move. Since it has a link mechanism for reducing and expanding the diameter of the substantially L-shaped drop prevention claw 5 pivoted pivotally, the slide shaft 4 is moved to the upper end and the fall prevention claw 5 is reduced in diameter by the link mechanism. The fall prevention mechanism 3 can be inserted into the through hole 25b without damaging the inner peripheral surface 25a of the hollow member 25 in the state of being housed inside the arm portion 6, and the slide shaft 4 is freely dropped after insertion. The fall prevention claw 5 is easily rotated by the link mechanism to the outside of the arm portion 6 to expand the diameter, and is brought into contact with the bottom surface 25c of the hollow member 25 to reliably support the hollow member 25 and lift and suspend it. Can be lowered and moved.
(2) Since the weight of the hollow member 25 is applied to the fall prevention claw 5 when the fall prevention claw 5 is expanded in diameter, the link mechanism of the fall prevention mechanism 3 works to prevent the fall prevention claw 5 from rotating in the reduced diameter direction. Therefore, the bottom surface 25c of the hollow member 25 can be reliably supported, lifted, suspended, and moved, and after the movement, the arm portion 6 can be moved by the link mechanism simply by sliding the sliding shaft 4 upward. The fall prevention claw 5 can be turned inward to reduce the diameter, and the hollow member 25 can be placed at a desired position.
(3) When the sliding shaft 4 is lowered, the fall prevention claw 5 is rotated by the link mechanism so as to increase in diameter from the center side of the hollow member 25 toward the outer periphery, so that the bottom surface 25c of the hollow member 25 and the floor The fall-preventing claw 5 can be inserted from a slight gap with the surface, and the bottom surface 25c of the hollow member 25 can be reliably supported.
(4) By having the notch 5b at the tip of the fall prevention claw 5, the corners of the inner peripheral surface 25b and the bottom 25c of the hollow member 25 can be locked, and the hollow member 25 swings when lifted. It has excellent reliability and stability.
(5) Since the fall prevention mechanism 3 includes the stopper portion 19 that fixes the slide shaft 4 to the shaft portion 2, the slide shaft 4 can be lowered or the fall prevention claw other than when the hollow member 25 is lifted. 5 does not expand, so that when the lifting jig 1 is inserted into and removed from the through hole 25a of the hollow member 25, the fall prevention mechanism 3 is damaged or the inner peripheral surface 25b of the hollow member 25 is damaged. It can be surely prevented from sticking.
(6) When the hollow member 25 is lifted, the slide shaft 4 can be freely dropped by the weight of the fall prevention mechanism 3 simply by releasing the stopper portion 19 that prevents the slide shaft 4 from sliding, and the link mechanism automatically Thus, the fall prevention claw 5 can be expanded in diameter and the hollow member 25 can be reliably supported.
(7) By using free fall for sliding of the sliding shaft 4, piping such as air and electricity and a power source are not required, and the structure is simple and the productivity is excellent.
(8) Since the shaft portion 2 includes the clamp portion 9 that expands in diameter in the through hole 25a of the hollow member 25 and engages with the inner peripheral surface 25b of the hollow member 25, the hollow member 25 has a floor surface or the like. Even when the clamp member 9 is placed directly vertically, the clamp portion 9 is brought into contact with the inner peripheral surface 25b of the hollow member 25, clamped by a frictional force and lifted, and a gap is formed between the bottom surface 25c of the hollow member 25 and the floor surface. After opening, the bottom face 25c of the hollow member 25 can be supported by the fall prevention mechanism 3, and the hollow member 25 can be easily lifted, hung, and moved.
(9) The clamp part 9 is a cylindrical part 10 that locks the clamp part 9 to the shaft part 2, and one or more fixed clamp pieces that are disposed on the cylindrical part 10 and contact the inner peripheral surface 25 b of the hollow member 25. 11, a clamp link portion 14 in which one end is pivotally pivoted on the tubular portion 10, and the other end is provided with an engagement clamp piece 15 that abuts against the inner peripheral surface 25 b of the hollow member 25, and the tubular portion A clamping lever 16 pivotally pivotable to 10 and an upper link portion 18 pivoted at one end to the clamping link portion 14 and pivoted at the other end to the clamping lever 16. 16, the clamp link portion 14 can be rotated and enlarged in diameter via the upper link portion 18, and the engagement clamp piece 15 disposed in the clamp link portion 14 can be moved into the hollow member 25. Abutting parallel to the peripheral surface 25b I was able to perform lifting of the hollow member 25 by frictional force.
(10) By providing the upper link portion 18 that rotates the clamp link portion 14 by the rotation of the clamp lever 16, the clamp link portion 14 is expanded in diameter unless the clamp lever 16 is rotated in the reverse direction. In this state, the state where the engagement clamp piece 15 is pressed against the inner peripheral surface 25b of the hollow member 25 can be maintained, and the reliability is excellent.
(11) Two fixed clamp pieces 11 and one engagement clamp piece 15 are arranged on the circumference along the inner peripheral surface 25 b of the hollow member 25, so that the fixed clamp piece 11 of the hollow member 25 is arranged. The center portion of the shaft portion 2 and the through hole 25a of the hollow member 25 can be aligned simply by making contact with the inner peripheral surface 25b, and the engagement clamp piece 15 can be easily hollowed by rotating the clamp lever 16. It can be engaged with the inner peripheral surface 25b of the member 25, and the hollow member 25 can be held.
(12) By arranging the fall prevention claw 5, the fixed clamp piece 11 and the engagement clamp piece 15 equally on the circumference, the weight of the hollow member 25 can be evenly distributed, and the hollow member 25 is held in a well-balanced manner. Because it can be used, it has excellent stability during lifting.
(13) By providing the upper surface guide portion 12 that comes into contact with the upper surface 25d of the hollow member 25, it is possible to easily perform the positioning in the height direction according to the height of the hollow member 25, and to lift it up when working with a crane or the like. When the tool 1 is lowered, the upper surface guide portion 12 serves as a stopper to prevent the lifting jig 1 from being lowered too much, and the fall prevention mechanism 3 can be prevented from coming into contact with the floor surface and being damaged.
(14) By arranging the fixed clamp piece 11 in contact with the inner peripheral surface 25b of the hollow member 25 according to the diameter of the through hole 25a, the center position of the through hole 25a of the shaft portion 2 and the hollow member 25 can be easily set. The bottom face 25c of the hollow member 25 can be reliably supported by the fall prevention mechanism 3.
(15) By providing the height adjusting pin 9a that slidably fixes the clamp portion 9 in the axial direction of the shaft portion 2, the clamp portion 9 and the fall prevention mechanism 3 can be adjusted in accordance with the height of the hollow member 25 to be lifted. Positioning can be performed, the hollow member 25 can be reliably clamped, and the bottom portion 25c of the hollow member 25 can be supported by the fall prevention mechanism 3.
(16) The suspension part 22 such as an eyebolt formed in an annular shape is arranged at the upper end of the shaft part 2 so that the suspension part 22 can be securely grasped and lifted, or the suspension part 22 can be lifted by a crane or the like. The hollow member 25 having a heavy weight can be lifted by connecting the two, which is excellent in workability and versatility.
(17) By including the clamp portion 9 that engages with the inner peripheral surface 25b of the hollow member 25 and the fall prevention mechanism 3 that supports the bottom surface 25c of the hollow member 25, the clamp is released due to wear of the clamp portion 9 or the like. Even if the hollow member 25 slides downward, the fall prevention mechanism 3 can support the hollow member 25 and prevent the fall, so that the transport reliability and reliability are further improved.

(Embodiment 2)
The lifting jig in Embodiment 2 of this invention is demonstrated below using drawing.
FIG. 4A is a cross-sectional plan view of the main part of the lifting jig according to the second embodiment of the present invention, and FIG. 4B is a side sectional view of the main part of the lifting jig according to the second embodiment of the present invention. is there.
The lifting jig in the second embodiment is different from the first embodiment in that it has a stopper releasing means 30.
30 is a stopper releasing means provided continuously with the clamp portion 9, 31 is a pressing member projecting from a pivot portion 18b pivoting the upper link portion 18 on the clamp lever 16, and 32 is in contact with the pressing member 31 at the end. A sliding member 33 is provided on the upper surface of the sliding member 32, and one end thereof is pivoted by the pivotal portion 33a. The rotating claw 33b is a tip pressing surface formed at the other end of the rotating claw 33, 33c is a contact side surface formed on the sliding shaft 4 side of the rotating claw 33, and 34 is the rotating claw 33. A torsion coil spring disposed on the pivot portion 33a and urging the rotating claw 33 toward the sliding shaft 4, 35 is a sliding guide portion connected to the cylindrical portion 10 and through which the sliding member 32 is inserted, and 35a is It is disposed inside the sliding guide portion 35 and comes into contact with the tip of the sliding member 32 to slide. A sliding spring 35 for sliding the member 32, a communication opening 35 b formed on the side of the sliding guide portion 35 for projecting the rotating claw 33 to the outside of the sliding guide portion 35, and 36 rotating on the shaft portion 2. A connecting rod 37a, which is suspended from a freely inserted rotating ring 37 and is pressed by the tip pressing surface 33b of the rotating claw 33 and rotates around the axis of the sliding shaft 4, 37a is a side portion of the rotating ring 37. This is an operation lever insertion hole through which the operation lever 21 provided in the sliding shaft 4 is inserted. Note that the phantom line in FIG. 4A indicates a state before clamping by the clamp unit 9.

The connecting operation of the clamp part of the lifting jig and the stopper releasing means in the second embodiment will be described with reference to FIG.
When the clamping lever 16 is rotated downward (in the direction of the arrow) to perform the clamping operation of the clamping portion 9, the pressing member 31 of the clamping lever 16 moves to the sliding shaft 4 side and presses the contact portion 32a. To do. When the contact portion 32a is pressed, the sliding member 32 connected to the upper end portion of the contact portion 32a and inserted through the sliding guide portion 35 slides while compressing the sliding spring 35a. By sliding of the sliding member 32, the tip pressing surface 33 b of the rotating claw 33 disposed on the upper surface of the sliding member 32 presses the connecting rod 36, and is connected to the connecting rod 36 and is rotatable about the shaft portion 2. The rotating ring 37 extrapolated to the center rotates around the axis of the sliding shaft 4. Since the operating lever 21 provided on the sliding shaft 4 is inserted into the operating lever insertion hole 37 a formed in the side portion of the rotating ring 37, the rotation of the rotating ring 37 slides through the operating lever 21. Transmission to the shaft 4 causes the sliding shaft 4 to rotate. As a result, the operating lever 21 moves from the position of the locking portion 20a of the locking groove 20 to the position of the sliding portion 20b, the stopper is released, and the sliding shaft 4 can slide. After that, the hollow member 25 can be lifted and moved by supporting it by the fall prevention mechanism 3 in the same procedure as in the first embodiment.
Release of the fall prevention mechanism 3 by operating the operation lever 21 after movement is performed manually as in the first embodiment. At this time, the operating lever 21 is lifted up to the upper end of the sliding portion 20b of the locking groove 20 and rotated to be locked to the locking portion 20a, but the sliding member 32 is moved to the left end by the pressing member 31 of the clamping lever 16. Since it is in the pressed state, the operation lever 21 can be rotated without the rotation claw 33 and the connecting rod 36 contacting each other. Next, after the hollow member 25 is placed on the floor surface, the clamp of the clamp portion 9 is released. By rotating the clamping lever 16 upward, the pressing member 31 of the clamping lever 16 moves away from the sliding shaft 4, and the contact portion 32a is released from the pressing. The abutting portion 32a and the sliding member 32 connected to the abutting portion 32a move to the initial position at the right end by the restoring force of the sliding spring 35a. At this time, the abutting side surface portion 33c formed on the sliding shaft 4 side of the rotating claw 33 comes into contact with the connecting rod 36, but since one end is pivoted by the pivot portion 33a, it is pressed by the connecting rod 36. It once rotates inside the sliding guide portion 35, and returns to the sliding shaft 4 side by the torsion coil spring 34 at the initial position, and the tip pressing surface 33b comes into contact with the side surface of the connecting rod 36 again.

As described above, the lifting jig according to the second embodiment is configured, and thus has the following actions in addition to the actions obtained in the first embodiment.
(1) The sliding member 32 that slides together with the contact portion 32a by the rotation of the clamping lever 16 and the communication that rotates the sliding shaft 4 by being pressed by the rotating claw 33 disposed on the sliding member 32. By having the rod 36, the sliding shaft 4 can be rotated in conjunction with the clamping work by the clamping lever 16, and the position of the operation lever 21 of the stopper portion 19 is moved from the locking portion 20 a of the locking groove 20. It can be moved to the sliding part 20b, and the stopper part 19 can be released simultaneously with the clamping.
(2) After the hollow member 25 is moved, when the fall prevention mechanism 3 is released by the operation lever 16, the sliding member 32 remains pressed by the pressing member 31 disposed on the clamping lever 16. The operating lever 21 can be rotated without the rotating claw 33 and the connecting rod 36 contacting each other, and the operating lever 21 can be locked to the locking portion 20a to fix the sliding shaft 4 to the shaft portion 2. it can.
(3) Since the slide member 32 is inserted into the slide guide portion 35 and has the slide spring 35a that presses the slide member 32 in the axial direction, the clamp portion 9 is clamped by the turning operation of the clamp lever 16. Only by releasing, the sliding member 32 can be slid along the sliding guide portion 35 by the restoring force of the sliding spring 35a, and the sliding operation of the sliding member 32 can be stabilized.
(4) Since the rotating claw 33 is pivotally pivoted to the sliding member 32 by the pivot portion 33a, the sliding member 32 slides and pivots when the clamp 9 is released. Even if 33 contacts the connecting rod 36, it is not caught and can be reliably returned to the initial position, so that it is possible to prepare for the stopper release operation.
(5) By interlocking the pivoting operation of the clamp lever 16 during clamping and the pivoting operation of the operation lever 21 of the stopper part 19, the stopper part 19 of the fall prevention mechanism 3 is released at the same time as the clamping operation is performed, and the sliding Since the moving shaft 4 automatically descends and the falling prevention claw 5 expands in diameter as the hollow member 25 is lifted, and the bottom surface 25c of the hollow member 25 can be supported, the operability and reliability are improved. Can be reliable.
(6) By connecting the sliding guide portion 35 through which the sliding member 32 is inserted to the cylindrical portion 10 of the clamp portion 9, the clamp portion 9 and the stopper releasing means 30 can be integrated, and the height Even when the clamp portion 9 is moved by the adjustment pin 9a, the stopper can be reliably released in conjunction with the clamping operation.

  The present invention is a lifting jig that lifts and conveys a hollow member through a through hole of a hollow member of a product or semi-finished product such as a stator case of a motor, and in particular, a fall prevention that supports the bottom of the hollow member By having a mechanism, the hollow member is securely supported and can be prevented from falling, and is excellent in safety, and by using a fall prevention mechanism that expands by natural fall when the hollow member is lifted, it is excellent in operability and reliability, By adopting a mechanism that does not use air, electricity, etc., piping and power sources are not required, the structure is simple and excellent in productivity, and it is compact and easy to handle. Since the mechanism has a stopper release means linked with the stopper part and the clamping work, it can be suitably used as a lifting jig with excellent reliability and operability. It can be used to automate the supply and recovery, etc. of the hollow member by causing I.

(A) Partial cross-sectional development of the lifting jig in Embodiment 1 of the present invention (b) Partially cutaway side view of the lifting jig in Embodiment 1 of the present invention Cross-sectional development view of the main part showing the usage state of the lifting jig in Embodiment 1 of the present invention (A) The top view which shows the use condition of the lifting jig | tool in Embodiment 1 of this invention (b) The bottom view which shows the use condition of the lifting jig in Embodiment 1 of this invention (A) Main part cross-sectional plan view of the lifting jig in Embodiment 2 of the present invention (b) Main part sectional side view of the lifting jig in Embodiment 2 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lifting jig 2 Shaft part 3 Fall prevention mechanism 4 Sliding shaft 5 Fall prevention claw 5a End part 5b Notch part 5c Bending part 6 Arm part 6a, 7a, 7b, 13a, 17a, 18a, 18b Axis part 7 Falling Prevention link portion 8 Link support portion 9 Clamp portion 9a Height adjustment pin 9b Fitting hole 10 Cylindrical portion 11 Fixed clamp piece 11a Elastic contact member 12 Upper surface guide portion 13 Lower support portion 14 Clamp link portion 15 Engagement clamp Piece 16 Clamping lever 17 Upper support portion 18 Upper link portion 19 Stopper portion 20 Locking groove 20a Locking portion 20b Sliding portion 21 Operation lever 22 Lifting portion 25 Hollow member 25a Through hole 25b Inner peripheral surface 25c Bottom surface 25d Upper surface 30 Stopper release means 31 Press member 32 Sliding member 32a Abutting portion 33 Rotating claw 33a Pivotal portion 3 b pressure end face 33c abutting side portions 34 torsion coil spring 35 sliding guide portion 35a slides spring 35b contact openings 36 contact bar 37 rotating ring 37a operating lever insertion hole

Claims (7)

  A lifting jig for lifting a hollow member of a product or semi-finished product having a circular or rectangular through hole, and is disposed at a shaft portion inserted into the through hole of the hollow member and a lower end of the shaft portion. A fall prevention mechanism that contacts the bottom surface of the hollow member by expanding the diameter and supports the hollow member, and the fall prevention mechanism is inserted into the shaft portion and is slidable in the axial direction of the shaft portion. A sliding shaft, an arm portion disposed at the lower end of the shaft portion, and one to six, preferably one to three approximately pivoted at one end to the lower end of the arm portion. An L-shaped drop-preventing claw, and a drop-preventing link portion having one end pivotably pivoted on the bent portion of the fall-preventing claw and the other end pivotally pivoted on the lower end of the sliding shaft; A lifting jig characterized by comprising:   The lifting jig according to claim 1, wherein the fall prevention mechanism includes a stopper portion that fixes the sliding shaft to the shaft portion.   The lifting jig according to claim 1, wherein the shaft portion has a clamp portion that expands or expands in the through hole of the hollow member and engages with an inner periphery of the hollow member. .   A cylindrical portion that is extrapolated to the shaft portion and engages the clamp portion with the shaft portion, and one or more fixed clamps that are disposed on the cylindrical portion and contact the inner periphery of the hollow member And a clamp link portion having one end pivotably pivoted to the lower portion of the cylindrical portion and the other end disposed with an engagement clamp piece abutting against the inner peripheral surface of the hollow member, and one end of the tube A clamping lever pivotally pivoted on the upper portion of the shaped portion, and one end pivoted on the clamping link portion and the other pivoted on the clamping lever. The lifting jig according to claim 3, further comprising an upper link portion that rotates the portion.   A guide portion that is disposed so as to be slidable in the axial direction of the cylindrical portion and that abuts against an upper surface and / or an inner peripheral surface of the hollow member to align the clamp portion and the hollow member; The lifting jig according to claim 3 or 4, wherein the lifting jig is provided.   The lifting jig according to any one of claims 3 to 5, further comprising a height adjusting mechanism that slidably fixes the clamp portion in an axial direction of the shaft portion. a. An inverted L-shaped locking groove having a locking portion formed in the radial direction of the shaft portion and a sliding portion formed in the axial direction, and the locking groove disposed on the sliding shaft A stopper provided with an operating lever protruding from the
b. A pressing member projecting from the side of the clamping lever; a sliding member that is connected to the contacting portion that contacts the pressing member and slides together with the contacting portion by the rotation of the clamping lever; A pivoting pawl pivotally pivoted on the sliding member by a pivotal portion, a sliding guide portion connected to the tubular portion of the clamp portion and through which the sliding member is inserted, and the sliding guide A sliding spring disposed inside the portion and pressing the sliding member in the axial direction; and a connecting rod connected to the sliding shaft and pressed by the rotating claw to rotate the sliding shaft. Stopper release means having,
The lifting jig according to any one of claims 4 to 6, further comprising:

Images