JP2000327260A - Lifting gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting gear capable of automating the opening and closing of a clamp to hold a rail. SOLUTION: A hoisting accessory 1 is guided by an elevating guide rod free to vertically move, and a pair of left and right clamp claws 12 is pivotally mounted on a sliding rod 3 fixed on the hoisting accessory 1 through a link arm 11. The clamp claws 12 and the hoisting accessory 1 are connected to each other by a cam operating plate 16, each of guide grooves 27-29 formed on a cam plate 17 and an engagement pin 26 to be fixed on the cam operating plate 16 are engaged with each other, and opening and closing of the clamp claws 12 are changed over to each other by changing engagement positions of each of the guide grooves 27-29 and the engagement pin 26 by interlocking with elevating motion of the hoisting accessory 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device used for carrying rails and the like.

[0002]

2. Description of the Related Art Conventionally, for example, a clamp claw used for transporting rails for railways and the like includes a fixed clamp that can be opened and closed and a movable clamp that is supported by a pivot pin and a fixed pin that fixes each of these clamps. It is constituted by. When the rail is clamped by the clamp claws, the fixing pin is pulled out, the movable clamp is rotated in the opening direction and attached to the rail, and then the movable clamp is closed and the fixed clamp and the movable clamp are fixed by the fixing pin. After clamping the rail with the clamp claws in this manner, the clamp claws were lifted with ropes using a lifting machine such as a hoist or a crane to transfer the rail to a desired position. In such a case, at least three clamp claws were fixed to the rail and suspended with a rope. For this reason, when lifting a rail, it is necessary to fix a fixed clamp and a movable clamp with a fixed pin after mounting a plurality of clamp claws on the rail along the longitudinal direction of the rail, which is troublesome for inserting the fixed pin. It takes. Moreover, such fixing pins need to be pulled out from the clamp claws when the rails are lowered and the clamp claws are removed from the rails.
Further, the lifting work of the rail is troublesome. Furthermore, such a method of clamping the rail with the clamp claws requires at least two workers, an operator who attaches / detaches the fixing pin to / from the clamp claws and an operator who operates the lifting machine. I can not plan. In addition, when lifting rails with multiple workers, lifting the rails with the clamp claws incomplete may cause the rails to fall, and there is a time loss for safety confirmation, etc., making work inefficient. It is.

An object of the present invention is to solve the above-described problem by performing a simple and easy clamping operation on a suspended object and automatically switching between gripping and releasing of the suspended object. It is intended to provide a device.

[0004]

According to a first aspect of the present invention, there is provided a hoisting apparatus comprising: a pair of left and right guide rods; a slide member movably supported by the guide rods; and a hanger connected to the slide member. A pair of left and right clamp pawls pivotally supported so as to be openable and closable via a link arm pivotally attached to the slide member, and a cam provided by connecting the clamp pawls and the hanging tool so as to be able to abut against the object to be lifted An operation plate, and a switching mechanism that engages with the operation plate and switches the opening / closing operation of the clamp claw in conjunction with the elevating operation of the hanging tool.

[0005] With the above configuration, in order to lift, for example, a rail as an object to be lifted, a wire of a lifting machine is connected to a lifting device, and a lifting device is lifted. At this time, the clamp pawl is held in an open state by the switching mechanism, and when the lifting device is lowered by the lifting machine, the cam operating plate comes into contact with the rail, and the clamp pawl is closed by the switching mechanism engaged with the cam operating plate, The rail is clamped by the clamp claws.
In this state, the rail held by the clamp claws is lifted by lifting the hanging tool. Then, the rail held by the clamp claws is grounded to lower the rail, and in this state, when the wire connected to the hanging tool is loosened, the hanging tool first descends along the lifting guide rod due to the weight of the hanging tool itself. For this reason, the slide rod connected to the hanging tool descends, and the link arm pivotally attached to the slide rod is pushed down. Thereby, each clamp claw is pivoted outward by each link arm, and the clamp claw is separated from the rail. In this way, the lifting tool is lifted with each clamp claw separated from the rail,
Due to the weight of the lifting device itself, immediately after lifting, the lifting device on the rail maintains the stopped state without being raised in conjunction with the lifting operation of the lifting machine, so the lifting device and the slide guided by the lifting guide rod Only the rod is raised, and the clamp pawl is held in an open state by the switching mechanism in conjunction with the lifting operation of the hanging tool. That is, the clamp claw is held in an open state, and when the lifting device is lowered to lift the rail again, the rail can be gripped. Thereafter, the same operation is repeated to automate the opening / closing switching operation of the clamp claw in a series of operations for lifting and lowering the rail.

In a lifting device according to a second aspect of the present invention, a guide frame for contacting the object to be lifted is provided below the guide rod, and the clamp claw and the object to be lifted are provided on the lower surface side of the guide frame. A positioning mechanism for positioning is provided.

With the above structure, when the lifting device is horizontally moved to the rail side by a lifting machine such as a hoist or a crane, the guide frame comes into contact with the rail, and the guide frame rides on the upper surface of the rail. Thereafter, when the guide frame is slid while the lower surface of the guide frame is along the upper surface of the rail, the guide frame and the rail are positioned by the positioning mechanism.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a flat plate-shaped hanging member made of a steel plate or the like, and an upper portion of the hanging member 1 has a ring portion for connecting a lifting rope R connected to a lifting machine (not shown) such as a hoist or a crane. 2 are formed. A horizontal slide rod 3 as a slide member penetrates a lower portion of the hanging tool 1, and a pair of right and left elevating members T-shaped guide members 5, 5 fixed to both ends of the slide rod 3 are arranged vertically. It is guided by guide rods 6, 6 so that it can move up and down. Washers 7, 7 are fixed to the upper ends of the lift guide rods 6, 6, respectively. The washers 7, 7 are used to prevent the hanging tool 1 that guides the lift guide rods 6, 6 vertically to be able to move freely. ing.

Reference numeral 10 denotes a clamp mechanism mounted on the slide rod 3. A pair of left and right link arms 11, 11 positioned on both sides of the hanging tool 1 and pivotally connected to the slide rod 3 are provided. , 11 are constituted by a pair of left and right clamp claws 12, 12 pivotally attached to the lower ends. Each of the link arms 11, 11 and each of the clamp claws 12, 12 are pivotally connected by a pin 13, and each of the clamp claws 12, 12 pivotally connected to each of the link arms 11, 11.
Are pivotally connected to each other in an X-shape so as to be opened and closed by a pin 14.

Reference numeral 15 denotes a switching mechanism for switching the opening / closing operation of the clamp claws 12, 12 in conjunction with the vertical movement of the hanging member 1.
A cam operation plate 16 for connecting the hanging member 1 and the clamp claws 12, 12; and a triangular cam plate rotatably supported between the cam operation plate 16 and the hanging member 1. It consists of seventeen. The cam operation plate 16 has a bent portion 16A at a lower end portion and is bent in an L shape, and elongated holes 20 and 20A are formed at an upper end and a substantially middle portion. 1
The pin 18 to be fixed to the
A slide rod 3 is movably inserted into A, and a lower end of a cam operation plate 16 has a pin 1 for pivotally connecting the clamp claws 12, 12.
It is pivoted to 4. In this manner, the cam operation plate 16 is bridged between the pin 14 for pivotally connecting the clamp claws 12 and 12 and the pin 18 for fixing to the hanging tool 1, so that the folding operation formed at the lower end of the cam operation plate 16 is achieved. A curved portion 16A is located below the pin 14 so as to be located inside the holding portion 12A of each of the clamp claws 12,12. The cam plate is attached to the pin 18 fixed to the hanging member 1.
The cam plate 17 is rotatably pivoted, and an engagement pin 26 fixed to the cam operation plate 16 is engaged with a cam groove 25 formed on the front side of the cam plate 17.

A cam groove 25 formed in the cam plate 17 includes first guide grooves 27 radially extending in three directions from a pin 18 serving as a rotation center of the cam plate 17 as shown in FIG.
A second guide groove 28 located at an intermediate portion of the guide groove 27,
It comprises a third guide groove 29 connecting the first guide groove 27 and the second guide groove 28. Also, the first guide groove 27
The lower end portion is formed in the shape of a long groove farthest from the pin 18, and the second guide groove 28 is bifurcated from the first guide groove 27 toward the pin 18 so as to be inclined. The second guide groove 28 is formed with a third guide groove 29 formed substantially in a V shape.
To the third guide grooves 27, 28, 29 are annularly continuous.

Reference numeral 30 denotes a pair of left and right guide frames fixed to the lower ends of the lift guide rods 6, 6, respectively. Each guide frame
A curved portion 32 is formed on one side of the guide frame 30 so as to abut against a rail 31 to be lifted, and a projecting portion projecting from a lower portion of the guide frame 30 and abutting on the rail 31 is formed on the other side of the guide frame 30.
33 is formed, and a retractable stopper 34 that comes into contact with the rail 31 in opposition to the protrusion 33 is assembled. The stopper 34 is formed in a trapezoidal shape having an inclined portion 35 on the outer edge. The stopper 34 is vertically movably held by a pair of left and right stopper guides 36 fixed to the guide frame 30. Then, a positioning mechanism 37 is formed by the stopper 34 and the projection 33.
Is composed. The stopper 34 and the guide frame 30 are fixed by a pin 38.
The stopper 34 is held movably up and down within the range of the long hole 40 by loosely fitting it into the long hole 40 formed at the bottom. The guide frames 30 are integrally connected by a plurality of connecting rods 45.

The operation of the embodiment constructed as described above will be described. First, in order to lift the rail 31, a wire R of a lifting machine (not shown) such as a crane or a hoist is used.
Is connected to the ring portion 2 of the lifting tool 1 to lift the lifting device. In this state, as shown in FIG. 4 (a), the engagement pin 26 engages with the second guide groove 28 to lock each of the clamps. Claws 12,1
2 is held open. Then, the lifting device is horizontally moved by a lifting machine (not shown) to abut the rail 31 on the curved portion 32 of the guide frame 30, and the rail 31 is guided along the curved portion 32, so that the upper surface of the rail 31 The guide frame 30 gets on. Thereafter, when the guide frame 30 is slid along the lower surface of the guide frame 30 along the upper surface of the rail 31, the inclined portion 35 of the stopper 34 assembled to the guide frame 30 comes into contact with the head of the rail 31, and the guide frame 30 slides. As a result, the stopper 34 pushed by the rail 31 is raised. Thereafter, as shown in FIG. 4B, by further sliding the guide frame 30, the stopper 34 gets over the rail 31 and the rail 31 and the protruding portion 33 of the guide frame 30 abut. As a result, the stopper 34 is lowered by its own weight, and the rail 31 is sandwiched between the stopper 34 and the protruding portion 33, so that the guide frame 30 and the rail 31 are positioned. In the state where the guide frame 30 and the rail 31 are positioned as described above, as shown in FIG. 4C, the rail 31, the cam operation plate 16 and the hanging tool 1 are located on the same axis, and the cam operation plate 16 The bent part 16A bent at the lower end of each clamp claw 1
When the lifting device is lowered, the bent portion 16A of the cam operation plate 16 first comes into contact with the rail 31 because it is located inside the holding portions 12A. As a result, the cam operation plate 16 stops, but the slide rod 3 movably held up and down along the elevating guide rods 6, 6 and the hanging tool 1 connected to the slide rod 3.
Descends. Thereby, the cam plate 17 rotates clockwise by the engagement between the cam groove 25 of the cam plate 17 pivotally supported by the hanging member 1 and the engagement pin 26 fixed to the cam operation plate 16. As a result, the engagement pin 26 that has been engaged with the second guide groove 28 becomes a third guide groove 29 that is inclined along the second guide groove 28.
Move to the side. Thereby, the lock of each clamp claw 12, 12 is released. In this state, when the lifting tool 1 is lifted by the wire R of the lifting machine, the weight of the clamp mechanism 10 and the guide frame 30 itself causes the rail 31 to be lifted immediately after lifting.
The upper guide frame 30 maintains the stopped state without being raised in conjunction with the lifting operation of the wire R of the lifting machine. Further, since the bent portion 16A of the operation plate 16 is interposed between the rail 31 and the guide frame 30, the stopped state of the operation plate 16 is maintained. Therefore, immediately after lifting, the lifting tool 1 guided by the lifting guide rods 6, and the sliding rod 3 connected to the lifting tool 1.
And only the cam plate 17 rises. Thereby, the cam plate 17 is further rotated clockwise by the engagement between the cam groove 25 of the cam plate 17 pivotally supported by the hanging member 1 and the engagement pin 26 fixed to the cam operation plate 16, so that the third The engagement pin 26 engaged with the guide groove 29 moves to the longest first guide groove 27 side. At the same time, the link arms 11, 11 pivotally connected to the slide rod 3 connected to the lower end of the hanging tool 1 are lifted by the lifting of the slide rod 3, and as shown in FIG. The clamping portions 12A of the clamp claws 12 and 12 pivotally connected to 11 rotate in the closing direction, that is, inward, and the clamp claws 12 and 12 close. Thus, the rail 31 is provided by each of the clamp claws 12, 12.
Is held, and the rail 31 is lifted by the lifting of the hanging tool 1. Next, the rail 31 clamped between the clamp claws 12
When lowering, the rail 31 clamped between the clamp claws 12
Transports the lifting rail 31 to the desired position,
The rail 31 is lowered. At this time, when the rail 31 sandwiched between the clamp claws 12, 12 is lowered to the ground, the clamp claws 12, 12 are separated from the rail 31. That is, as shown in FIG. 5B, when the wire R connected to the hanger 1 is loosened with the rail 31 grounded, first, the hanger 1
Descends along the lifting guide rods 6,6. At this time, the bent portion 16A of the cam operation plate 16 abuts on the rail 31, and the cam operation plate 16
Of the cam plate 17 is rotated in the clockwise direction by the engagement between the cam groove 25 and the engaging pin 26 in conjunction with the lowering operation of the hanging member 1 and the first guide is lifted. Groove 27
The engagement pin 26 which has been engaged with the link moves to the third guide groove 29 side, and the slide rod 3 integrally connected with the hanging tool 1 descends, whereby the link pivotally attached to the slide rod 3 is lowered. The arm 11 is pushed down, and the clamp claws 12, 12 are opened outward by the link arms 11, so that the clamp claws 12, 12 are separated from the rail 31. When the lifting tool 1 is lifted in a state where the clamp claws 12, 12 are separated from the rail 31, the weight of the clamp mechanism 10 and the guide frame 30 itself causes
The guide frame 30 on the rail 31 and the operation plate 16 having the bent portion 16A interposed between the rail 31 and the guide frame 30 maintain the stopped state.
Therefore, only the hanger 1 guided by the elevating guide rods 6, 6 and the slide rod 3 and the cam plate 17 connected to the hanger 1 rise, and as shown in FIG. A cam groove 25 of a cam plate 17 that is pivotally supported and an engaging pin fixed to the cam operation plate 16
The cam plate 17 is rotated clockwise by the engagement with the
The engagement pin 26 that has been engaged with the guide groove 29 moves to the second guide groove 28 side. Then, the engaging pin 26 is hooked on the lower end portion on the second guide groove 28 side, and the hanging tool 1 and the cam operation plate 16 are integrated. Since a pin 14 for pivotally connecting the clamp claws 12, 12 is pivotally attached to the lower end side of the cam operation plate 16, the rotation of the clamp claws 12, 12 in the closing direction is regulated by the cam operation plate 16, and the cam operation plate 16 is opened. Held in state. That is, FIG.
When the rail 31 is lifted again when the rail 31 is lifted again, the operation of FIGS. 4 (a) to 5 (c) can be repeated to grasp the rail 31. When lowering the sandwiched rail 31 to the ground,
The clamp claws 12, 12 can be automatically opened to open the rail 31, and the opening / closing switching work of the clamp claws 12, 12 can be automated in a series of operations such as lifting and hanging the rail 31.

As described above, in this embodiment, during a series of operations such as lifting and lowering of the rail 31, the operation of switching the opening and closing of the clamp claws 12, 12 can be automated, so that the workability is excellent, and The lifting and lowering work of the rail 31 can be performed only by operating the lifting machine, so that the work efficiency and labor can be saved. Also,
By assembling the guide frame 30 and the stopper 34 at the lower part of the hanging tool 1, the clamp claw 12 and the rail 31 can be easily and accurately positioned, and the rail 31 is formed by the protrusion 33 of the guide frame 30 and the stopper 34. By pinching, the swing back of the hanging tool 1 hung by the rope R can be regulated, and the safety of work can be enhanced. Further, since the clamp claw 12 is switched between gripping and releasing in conjunction with the lifting and lowering operation of the hanging tool 1 by the rope R, a drive source such as a motor is not required as a means for driving the clamp claw 12, and the power supply facility is not provided. Work can be performed in outdoor work, and the overall configuration of the apparatus is simple and inexpensive.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments.
Various modifications can be made within the scope of the present invention.
For example, the basic structure of the lifting device, such as the guide structure of the lifting tool, the stopper structure of the rail, or the shape of the guide frame, is not limited to the above-described embodiment, but may be appropriately selected. Although the rails are shown as the objects to be lifted in the above-described embodiment, the present invention is also applicable to a lifting device for concrete blocks and various works.

[0016]

According to the lifting device of the first aspect of the present invention, a pair of left and right guide rods, a slide member movably supported by the guide rods, and a hanger connected to the slide member, A pair of left and right clamp claws pivotally supported so as to be openable and closable via a link arm pivotally attached to the slide member; a cam operation plate capable of contacting a lifted object connecting the clamp claws to the hanging member; A switching mechanism that has an operation plate and a cam plate that engages with each other and that switches the opening and closing operation of the clamp claw in conjunction with the lifting and lowering operation of the lifting tool, so that the object to be lifted is lifted. In a series of operations such as lifting and lowering, it is possible to automate the switching operation of the opening and closing of the clamp claws, so that the workability is excellent, and the lifting and lowering of the rail 31 can be performed simply by operating the lifting machine, It is possible to efficiency and labor-saving work. In the lifting device according to a second aspect of the present invention, a guide frame is provided below the guide rod so as to abut against the object to be lifted, and a positioning for positioning the clamp claws and the object to be lifted on the lower surface side of the guide frame. Since the mechanism is provided, the clamp claws and the rail can be easily and accurately positioned, and the swing back of the hanging tool hung by the rope can be restricted, so that work safety can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a lifting device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a plan view of the lifting device.

FIG. 4 is a side view showing a rail hanging operation;
4A shows a state where the rail and the clamp pawl are aligned, FIG. 4B shows a state where the rail and the clamp pawl are aligned, and FIG. 4C shows a state immediately before the clamp.

FIG. 5 is a side view showing a hanging operation of the rail;
5A shows a clamped state, FIG. 5B shows an open state of a clamp claw, and FIG. 5C shows a lifted state after the clamp is released.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hanging tool 3 Slide rod (slide member) 6 Elevating guide rod 10 Clamp mechanism 11 Link arm 12 Clamp claw 15 Switching mechanism 16 Cam operation plate 17 Cam plate (switching mechanism) 25 Cam groove (switching mechanism) 30 Guide frame 37 Positioning mechanism 31 Rail (suspended object) R wire

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Katsuhiko Hayatsu 7-3-69 Yamakido, Niigata City, Niigata Prefecture Hokuriku Heavy Industries, Ltd. (72) Kenji Murata 7-3-69 Yamakido Niigata City, Niigata Hokuriku F-term (reference) in Juki Industrial Co., Ltd. 2D057 BA12 3F004 AA07 AB13 AE03 AF04 AF06 AG03 EA07

Claims (2)

[Claims] 1. A pair of left and right guide rods, a slide member movably supported by the guide rod, a suspender connected to the slide member, and a link arm pivotally attached to the slide member. A pair of left and right clamp claws rotatably supported, a cam operation plate which is connected to the clamp claw and the hanging tool and is provided so as to be in contact with the object to be lifted; A switching mechanism for switching between opening and closing operations of the clamp claws in conjunction with the lifting and lowering operations of the lifting device. 2. A method according to claim 1, wherein a guide frame is provided at a lower portion of said guide rod for abutting on said object to be lifted, and a positioning mechanism for positioning said clamp claw and said object to be lifted is provided on a lower surface side of said guide frame. The lifting device according to claim 1, characterized in that: