JP7492845B2 - Lifting fixture - Google Patents

Description

The present invention relates to a lifting jig that holds a heavy object when lifting it with a transport device such as a crane.

Lifting jigs that are designed to be adjustable in gripping width have been developed to grip multiple types of heavy objects with different width dimensions (see Patent Document 1). Adjusting the gripping width of a lifting jig according to the prior art is carried out as follows.

The worker moves the base end side of each gripping member (the lower arm and the clamping member in Patent Document 1) in the arm longitudinal direction (longitudinal direction of the swinging arm) relative to each swinging arm (the upper arm in Patent Document 1) to align the adjustment hole of each gripping member with a predetermined adjustment hole among the multiple adjustment holes of each gripping member that corresponds to the width dimension of the heavy load. Then, the worker inserts the coupling engagement pin into the predetermined adjustment hole of each swinging arm to engage with the engagement hole of each gripping member. This allows the tip end of each swinging arm to be coupled to the base end of each gripping member with the gripping width of the lifting jig adjusted (changed) so that the distance between the pair of gripping members corresponds to the width dimension of the heavy load.

Japanese Utility Model Application Publication No. 5-37868

However, as mentioned above, to adjust the gripping width of the lifting jig, it is necessary to align the adjustment holes of each gripping member with the specified adjustment holes of each gripping member before engaging the coupling engagement pin with the engagement hole of each gripping member, which is a very troublesome task. Therefore, the adjustment work of the gripping width of the lifting jig takes a lot of time and effort, and there is a problem that it is difficult to improve the workability of the adjustment work of the gripping width of the lifting jig.

In addition, because the coupling engagement pin is a part that can be attached to and detached from the gripping member, if the coupling engagement pin comes off the gripping member, it may cause the gripping member to fall off, making it difficult to adequately ensure the safety of the worker.

Therefore, in order to solve the above-mentioned problems, the present invention aims to provide a lifting jig that allows the gripping width to be easily adjusted without using detachable parts that can be attached to and detached from the gripping member.

The hanging jig according to this embodiment includes a pair of swing arms connected to each other so as to be swingable in an opening/closing direction, each of which has a guide portion extending in an arm longitudinal direction, each of which includes a plurality of positioning recesses spaced apart in the arm longitudinal direction, an adjustment member provided on each of the swing arms so as to be movable in the arm longitudinal direction, each of which has a slider supported on the guide portion of each swing arm so as to be slidable in the arm longitudinal direction, each slider configured to be engageable with and disengageable from each of the positioning recesses of the swing arm, and a gripping member having a base end fixed to each of the adjustment members and for gripping a heavy object, each of which has a second guide portion extending in a direction parallel to the guide portion, and each of the adjustment members has a second slider supported on the second guide portion of each swing arm so as to be slidable in the arm longitudinal direction. Also, in this embodiment, a support claw for supporting a heavy object at a tip end of each gripping member may be formed at an acute angle.

The lifting tool according to this embodiment may include a link mechanism for swinging the pair of swinging arms in the opening and closing directions. The lifting tool according to this embodiment may also include an arm holding member that holds the pair of swinging arms so that they cannot swing when the distance (minimum distance) between the tip ends of the pair of gripping members is set to be larger than the width dimension of the heavy load. Furthermore, the lifting tool according to this embodiment may include an arm restricting member that restricts the pair of swinging arms from swinging in the closing direction beyond a predetermined position on the closing side.

According to this embodiment, the operator slides the slider of each adjustment member along the guide portion of each swing arm in the arm longitudinal direction, and engages it with a predetermined positioning recess among the multiple positioning recesses of each gripping member that corresponds to the width dimension of the heavy load. This makes it possible to easily adjust the gripping width of the lifting jig so that the distance between the pair of gripping members corresponds to the width dimension of the heavy load, without using any parts that can be attached or detached from the gripping members.

The present invention can improve the workability of adjusting the gripping width of a lifting jig by eliminating a lot of time and effort from the adjustment work while fully ensuring the safety of the worker.

FIG. 1A is a front view of the lifting jig according to this embodiment, showing a state in which the first sliding shafts of each adjustment member are engaged with positioning recesses on the outer left-right sides of the first guide grooves of each swing arm. FIG. 1B is a rear view of the lifting jig according to this embodiment, showing the state in which the first sliding shafts of each adjustment member are engaged with the positioning recesses on the outer left-right sides of the first guide grooves of each swing arm. FIG. 2 is a side view of the lifting jig according to this embodiment, showing a state in which the first sliding shafts of each adjustment member are engaged with the positioning recesses on the outer left-right sides of the first guide grooves of each swing arm. FIG. 3 is a perspective view of the lifting jig according to this embodiment, showing a state in which the first sliding shafts of each adjustment member are engaged with the positioning recesses on the outer left-right sides of the first guide grooves of each swing arm. FIG. 4A is a front view of the lifting jig according to this embodiment, showing the state in which the first sliding shafts of each adjustment member are engaged with the positioning recesses on the left-right middle side of the first guide grooves of each swing arm. FIG. 4B is a front view of the lifting jig according to this embodiment, showing the state in which the first sliding shafts of each adjustment member are engaged with the positioning recesses on the inner side in the left-right direction of the first guide grooves of each swing arm. FIG. 5A is a diagram for explaining the operation of this embodiment. FIG. 5B is a diagram for explaining the operation of this embodiment. FIG. 5C is a diagram for explaining the operation of this embodiment. FIG. 5D is a diagram for explaining the operation of this embodiment.

This embodiment will be described with reference to Figures 1A to 5D.

In the specification and claims of this application, "provided" means not only directly provided, but also indirectly provided and formed via another member. "Opening/closing direction" means the direction in which the tips of a pair of swing arms approach and move away from each other. "Opening direction" means the direction in which the tips of a pair of swing arms move away from each other, and "closing direction" means the direction in which the tips of a pair of swing arms approach each other. "Arm longitudinal direction" means the longitudinal direction of the swing arms. "Engagement/disengagement" means engagement and disengagement. In the specification of this application, "left-right direction" means one of the horizontal directions, and refers to the width direction of the lifting jig. "Front-rear direction" means the horizontal direction perpendicular to the left-right direction and perpendicular to the width direction of the lifting jig. In the drawings, "L" means the left direction, "R" means the right direction, "FF" means the front direction, "FR" means the rear direction, "U" means the up direction, and "D" means the down direction.

As shown in Figures 1A to 4B, the lifting jig 10 according to this embodiment grips the heavy load H when it is lifted by a crane (most of the crane is not shown). The lifting jig 10 can be hung on the lifting hook 12 of the crane. The lifting jig 10 is configured to have an adjustable (changeable) gripping width in order to grip three or more types of heavy loads H1, H2, and H3 with different width dimensions W. The width dimension W1 of the heavy load H1 (see Figure 1A) is larger than the width dimension W2 of the heavy load H2 (see Figure 4A), and the width dimension W2 of the second heavy load H2 is larger than the width dimension W3 of the third heavy load H3 (see Figure 4B). In this embodiment, the number of types of heavy loads H with different width dimensions W is three, but it may be two or four or more.

As shown in Figures 1A to 3, the lifting jig 10 has a pair of left and right swing arms 16 connected via a connecting shaft 14 so that they can swing (rotate) in the opening and closing directions. Each swing arm 16 has an inverted U-shaped cross section and has a ceiling portion 16t and side walls 16s formed on both the front and rear sides of the ceiling portion 16t.

A bottomless first guide groove (first guide slit) 18 is formed on each side wall 16s on the front and rear sides of each swing arm 16 as a first guide portion extending in the arm longitudinal direction (longitudinal direction of swing arm 16). Each first guide groove 18 of each swing arm 16 includes three positioning recesses 18a, 18b, 18c arranged at intervals in the arm longitudinal direction, and each positioning recess 18a (18b, 18c) is recessed downward in an L-shape. The three positioning recesses 18a, 18b, 18c consist of a positioning recess 18a on the outer side in the left-right direction, a positioning recess 18b on the middle side in the left-right direction, and a positioning recess 18c on the inner side in the left-right direction. Each first guide groove 18 including the three positioning recesses 18a, 18b, 18c is configured to be visible from the outside.

A bottomless second guide groove (second guide slit) 20 is formed on each of the front and rear side wall portions 16s of each swing arm 16 as a second guide portion parallel to the first guide groove 18. Each second guide groove 20 is located above each first guide groove 18. Each second guide groove 20 is configured to be visible from the outside. Note that each second guide groove 20 may be located below each first guide groove 18 instead of above each first guide groove 18.

An adjustment member 22 for adjusting the gripping width of the lifting jig 10 is provided inside each swing arm 16 so as to be movable in the arm longitudinal direction. Each adjustment member 22 has a first sliding shaft 24 as a first slider extending in the front-rear direction on its lower side. The front end of each first sliding shaft 24 is supported in the first guide groove 18 on the front side of each swing arm 16 so as to be slidable in the arm longitudinal direction, and is configured to be engageable and disengageable with each positioning recess 18a (18b, 18c) of the front first guide groove 18. The rear end of the first sliding shaft 24 is supported in the first guide groove 18 on the rear side of each swing arm 16 so as to be slidable in the arm longitudinal direction, and is configured to be engageable and disengageable with each positioning recess 18a (18b, 18c) of the rear first guide groove 18. Each end of each first sliding shaft 24 is configured to be inseparable from the first guide groove 18 of each swing arm 16 via an E-ring (not shown) and a washer 26, etc. Each first sliding shaft 24 is configured to be visible from the outside.

Each adjustment member 22 has a second sliding shaft 28 on its upper side as a second slider extending in the front-rear direction. The front end of each second sliding shaft 28 is supported in the second guide groove 20 on the front side of each swing arm 16 so as to be slidable in the arm longitudinal direction. The rear end of the second sliding shaft 28 is supported in the second guide groove 20 on the rear side of each swing arm 16 so as to be slidable in the arm longitudinal direction. Each end of each second sliding shaft 28 is configured to be inseparable from the second guide groove 20 of each swing arm 16 via an E-ring (not shown) and a washer 30, etc. Each second sliding shaft 28 is configured to be visible from the outside.

The base end (upper end) of a rod-shaped gripping member 32 for gripping the heavy load H is fixed to each adjustment member 22 via a fixing bolt 34, and each gripping member 32 extends downward. Each gripping member 32 extends in the vertical direction, and a support claw 36 is provided at the tip end (lower end) of each gripping member 32 to support the underside of the heavy load H from below. Each support claw 36 is formed at an angle slightly more acute than a right angle with respect to the base end side of the gripping member 32 that is continuous with it. When each support claw 36 is formed at an acute angle, it is possible to better prevent the heavy load H from falling when the heavy load H is gripped by a pair of gripping members 32. Note that each support claw 36 may be formed at a right angle or an obtuse angle instead of an acute angle.

As shown in Figures 1A, 4A, and 4B, when the lifting jig 10 is raised by a crane, the pair of gripping members 32 grip the heavy load H while swinging in the closing direction by utilizing the weight of the lifting jig 10. The pair of gripping members 32 grip the heavy load H1 with the ends of each first sliding shaft 24 engaged with the positioning recesses 18a on the left-right outer side of each first guide groove 18 (see Figure 1A). The pair of gripping members 32 grip the heavy load H2 with the ends of each first sliding shaft 24 engaged with the positioning recesses 18b on the left-right middle side of each first guide groove 18 (see Figure 4A). The pair of gripping members 32 grip the heavy load H3 with the ends of each first sliding shaft 24 engaged with the positioning recesses 18c on the left-right inner side of each first guide groove 18 (see Figure 4B). Note that instead of the pair of gripping members 32 using the weight of the lifting jig 10 to grip the heavy object H, the heavy object H may be gripped using a biasing member such as a spring (not shown).

As shown in Figs. 1A to 3, the lifting jig 10 is provided with a pantograph mechanism 38 as a link mechanism for swinging the pair of gripping members 32 in the opening and closing directions. Specifically, one end (lower end) of an operating link 40 is swingably connected to the base end of each swing arm 16 via a connecting pin 42. The other end (upper end) of each operating link 40 is swingably connected to a shackle shaft 46 of a shackle 44 as a hook member. In other words, the other end of one operating link 40 and the other end of the other operating link 40 are swingably connected via the shackle shaft 46 of the shackle 44. The portion of each swing arm 16 from the connecting shaft 14 side to the connecting pin 42 side constitutes a part of the pantograph mechanism 38, as do each operating link 40. The shackle 44 can be hooked to the lifting hook 12 of the crane.

A stripper bolt 48 is provided as a member to be locked on one of the swing arms 16 from the connecting shaft 14 side to the connecting pin 42 side. A locking hook 50 that can be locked to the stripper bolt 48 is provided on one of the operating links 40 via a mounting bolt 52 so as to be swingable in the vertical direction. An operating lever 54 is formed on the base end side of the locking hook 50 for swinging the locking hook 50. The locking hook 50 locks onto the stripper bolt 48 when the distance (minimum distance) S on the tip side of the pair of gripping members 32 is made larger than the width dimension of the heavy load H. In other words, the locking hook 50 corresponds to an arm holding member that holds the pair of swing arms 16 non-swingably when the distance S on the tip side of the pair of gripping members 32 is made larger than the width dimension of the heavy load H. In addition, a washer 56 is provided on one of the connecting pins 42 as an abutting member for abutting the locking hook 50 that has been released from the stripper bolt 48.

A stopper piece 58 is provided on the other swing arm 16 from the connecting shaft 14 side to the connecting pin 42 side via a mounting bolt 60. A guide hole 62 extending in the vertical direction is formed in the stopper piece 58. In addition, a movable bolt 64 is provided on the other operating link 40 as a movable member, and the movable bolt 64 is supported in the guide hole 62 of the stopper piece 58 so as to be movable in the vertical direction. When the pair of swing arms 16 are positioned at a predetermined position on the closing side, the movable bolt 64 abuts on the lower edge of the guide hole 62 of the stopper piece 58, and the swing of the pair of swing arms 16 in the closing direction is restricted. In other words, the stopper piece 58 corresponds to an arm restriction member that restricts the pair of swing arms 16 from swinging in the closing direction beyond a predetermined position on the closing side.

Next, we will explain the function and effect of the lifting jig 10 according to this embodiment.

While visually checking each guide groove 18 (20) of each swing arm 16 and each sliding shaft 24 (28) of each adjustment member 22, the worker slides each sliding shaft 24 (28) of each adjustment member 22 along each guide groove 18 (20) of each swing arm 16 in the arm longitudinal direction. Then, while visually checking the predetermined positioning recess of the first guide groove 18 of each swing arm 16 and the first sliding shaft 24 of each adjustment member 22, the worker engages the first sliding shaft 24 of each adjustment member 22 with the predetermined positioning recess of the first guide groove 18 of each swing arm 16. Here, the predetermined positioning recess is the positioning recess among the three positioning recesses 18a, 18b, 18c that corresponds to the width dimension of the heavy load H. This allows the gripping width of the lifting jig 10 to be easily adjusted so that the interval between the pair of gripping members 32 corresponds to the width dimension W of the heavy load H without using any detachable parts that are detachable from the gripping members 32.

Before adjusting the gripping width of the lifting jig 10, it is advisable for the worker to swing the locking hook 50 downward and lock it onto the stripper bolt 48.

When the first sliding shaft 24 of each adjustment member 22 is engaged with a predetermined positioning recess of the first guide groove 18 of each swing arm 16, for example, the positioning recess 18b on the middle side in the left-right direction, the following operation is performed when lifting a heavy object H2 stored in the storage box B with a crane.

As shown in FIG. 5A, the lifting jig 10 is moved horizontally by a crane to a position above (directly above) the heavy load H2. Next, as shown in FIG. 5B, the lifting jig 10 is lowered by a crane to touch or approach the inner bottom surface of the storage box B. Then, as shown in FIG. 5C, an operator swings the locking hook 50 upward and disengages it from the stripper bolt 48, thereby making the pair of swing arms 16 swingable in the closing direction. Thereafter, as shown in FIG. 5D, the lifting jig 10 is raised by a crane. Then, the pair of gripping members 32 grip the heavy load H2 while swinging in the closing direction using the weight of the lifting jig 10, and the heavy load H2 can be lifted by the crane.

Therefore, according to this embodiment, as described above, the gripping width of the lifting jig 10 can be easily adjusted so that the spacing between the pair of gripping members 32 corresponds to the width dimension W of the heavy load H, without using any detachable parts that are attached to and detached from the gripping members 32. Also, according to this embodiment, as described above, in order to prevent the swing arms 16 from accidentally closing and pinching the load, the stopper pieces 58 restrict the pair of swing arms 16 from swinging in the closing direction beyond a predetermined position on the closing side. Therefore, according to this embodiment, the safety of the worker is sufficiently ensured, and much time and effort can be saved from the adjustment of the gripping width of the lifting jig 10, thereby improving the workability (work efficiency) of adjusting the gripping width of the lifting jig 10.

The present invention is not limited to the above-described embodiment, but can be implemented in various forms by making appropriate modifications. The scope of rights included in the present invention is not limited to the above-described embodiment.

REFERENCE SIGNS LIST 10 Lifting jig 12 Lifting hook 14 Connecting shaft 16 Swing arm 16t Ceiling portion 16s Side wall portion 18 First guide groove (first guide portion)
18a Positioning recess 18b Positioning recess 18c Positioning recess 20 Second guide groove (second guide portion)
22 Adjustment member 24 First sliding shaft (first sliding portion)
26 Washer 28 Second sliding shaft (second sliding portion)
30: washer 32: gripping member 34: fixing bolt 36: support claw 38: pantograph mechanism (link mechanism)
40 Operating link 42 Connecting pin 44 Shackle (hook member)
46 Shackle shaft 48 Stripper bolt (engaged member)
50 Engagement hook (arm holding part)
52 Mounting bolt 54 Operating lever 56 Washer (contact member)
58 Stopper piece (arm restriction part)
60 Mounting bolt 62 Guide hole 64 Movable bolt (mover)
H Heavy object H1 Heavy object H2 Heavy object H3 Heavy object

Claims (5)

a pair of swing arms connected to each other so as to be swingable in an opening/closing direction, each of the swing arms having a guide portion extending in a longitudinal direction of the arm, each of the guide portions including a plurality of positioning recesses arranged at intervals in the longitudinal direction of the arm;
an adjustment member provided on each of the swing arms so as to be movable in the arm longitudinal direction, the adjustment member having a slider supported on the guide portion of each of the swing arms so as to be slidable in the arm longitudinal direction, the slider being configured so as to be engageable with and disengageable from each of the positioning recesses of the swing arms;
a gripping member having a base end fixed to each of the adjustment members and configured to grip a heavy object;
A lifting jig in which each oscillating arm has a second guide portion extending in a direction parallel to the guide portion, and each adjustment member has a second slider supported on the second guide portion of each oscillating arm so as to be slidable in the arm longitudinal direction. 2. The lifting jig according to claim 1 , wherein the support claws at the tip of each gripping member for supporting a heavy object are formed at an acute angle. 3. The lifting jig according to claim 1 , further comprising a link mechanism for swinging the pair of swing arms in an opening/closing direction. A lifting jig as described in any one of claims 1 to 3 , characterized in that it is provided with an arm holding member that holds the pair of oscillating arms so that they cannot swing when the distance between the tip ends of the pair of gripping members is made larger than the width dimension of the heavy object. 5. The lifting jig according to claim 1 , further comprising an arm restricting member that restricts the pair of swing arms from swinging in the closing direction beyond a predetermined position on the closing side.

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