JP3204625B2 - Suspension device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension device capable of hanging a heavy object stably.

[0002]

2. Description of the Related Art Conventionally, a jack shown in FIG. 9 has been used as a device for lifting a heavy object which is difficult to lift with a crane or as a press-fitting device for press-fitting an underground structure such as a caisson into the ground.

This lifting device comprises a hydraulic cylinder (2) of a center hole jack (5) fixed to a base (1), a lower gripper (3) provided below the hydraulic cylinder, and a piston (5) of a center hole jack (5). 1
7) The upper gripper (4), which is raised and lowered by a piston (17), and a steel gripper rod (6) inserted through a center hole jack (5). Both grippers (3), (4) Engaging piece (7) equipped on the
(9) is configured to engage the gripper rod (6).

The gripper rod (6) is provided with a plurality of bulging portions (11) in the axial direction, and a tapered guide surface (12) having a downwardly enlarged diameter is provided above the bulging portion (11). A stepped engagement surface (13) for engaging with the engagement pieces (7) and (9) is formed at a lower portion. A large diameter portion (1) is provided between the tapered guide surface (12) of the bulging portion (11) and the engagement surface (13).
4), a small-diameter portion (15) is provided between the tapered guide surface (12) and the engagement surface (13) of the bulge (11) at the upper stage.
Are formed.

As shown in FIG. 9A, the engaging piece (9) of the upper gripper (4) is engaged with the engaging surface of the gripper rod (6), and the upper gripper (4) supports the gripper rod (6). In this state, when hydraulic oil is supplied to the oil chamber (16) of the hydraulic cylinder (2), the piston (17) rises and the upper gripper (4) rises. Therefore, the gripper rod (6) engaged with the upper gripper (4) also moves up. The lower gripper (3) is pushed outward by the tapered guide surface (12) and slides on the large diameter portion (14). As shown in FIG. 9B, when the piston (17) reaches the upper stroke end, the lower gripper (3) faces the small-diameter portion (15) of the gripper rod, and the engagement piece (7) is moved inward by the urging force. And the engaging piece (7) moves to a position where it engages with the engaging surface (13) of the gripper rod (6). As shown in FIG. 9C, when the hydraulic oil in the oil chamber (16) is discharged and the piston (17) is lowered, the gripper rod (6) is lowered and is supported by the lower gripper (3). Upper gripper (4)
Is lowered with the lowering of the piston (17), and the engaging piece 9 is slid outward while sliding on the tapered guide surface (12), and slides on the large diameter portion (14). As shown in FIG. 9D, when the piston (17) reaches the lower stroke end, the upper gripper (4) faces the small-diameter portion (15) of the gripper rod 6, and the engagement piece (9) is set inward. Return to
It returns to the position where it engages with the gripper rod (6). By repeating this step, the gripper rod (6) can be intermittently raised with the distance between the adjacent upper and lower engagement surfaces (13) being one pitch.

If the base (1) of the lifting device is supported by a suitable support girder, a heavy object suspended at the lower end of the gripper rod (6) can be lifted. Also, if the lower end of the gripper rod (6) is connected to the underground anchor,
By the reaction force when pushing up the gripper rod (6), an underground structure such as a caisson disposed below the base (1) can be pressed into the ground.

[0007]

It would be convenient if the jack described above could be used to lift and lift a heavy object.

However, it is necessary to lower the gripper rod inserted through the center hole jack when suspending, but as it is, the engaging surface (13) of the bulging portion (11) and the upper and lower grippers (4) must be lowered. ) (3) engagement piece (9)
(7), and the gripper rod (6) cannot be lowered.

[0009] It is an object of the present invention to enable a lifting device using the above jack to be used as a suspension device.

[0010]

A center hole jack, an upper gripper and a lower gripper provided above and below the jack, and a gripper rod inserted into the jack, wherein the upper and lower grippers have a support block having an inclined surface and The gripper rod is composed of an engagement piece slidable on an inclined surface. By providing a gripper opening / closing mechanism for releasing the engagement between the engagement piece and the engagement portion of the gripper rod in conjunction with the reciprocation of the piston, interference between the gripper rod and the engagement piece is prevented.

More specifically, the lower gripper opening / closing mechanism includes:
A first elevating member that moves up and down together with the upper gripper, a pressure receiving unit that moves up and down following the first elevating member while the upper gripper moves between the upper limit and a position immediately before the upper limiter, A first transmission member that transmits the engagement piece to the engagement piece of the gripper and retracts the engagement piece from the engagement position, wherein the upper gripper opening / closing mechanism moves up and down in conjunction with the upper gripper A restricting portion for restricting the lowering movement of the second elevating member while the upper gripper moves between the lower limit and the position immediately before the upper gripper; A second transmission member that transmits the downward movement of the gripper to the engagement piece of the upper gripper and retracts the engagement piece from the engagement position.

An elastic member for adjusting the opening / closing timing is interposed between the first pressing member and the lower gripper via the pressure receiving portion and the first transmitting member, and between the second elevating member and the second transmitting member. It is better to let.

In each of the first transmission member and the second transmission member, speed increasing means for increasing the moving speed on the gripper side of the two transmission members more than the elevating speed of the upper gripper is interposed. preferable.

A specific example of the speed increasing means is a lever or a gear train.

Further, the present invention comprises a center hole jack, an upper gripper and a lower gripper provided above and below the jack, and a gripper rod inserted into the jack, wherein the upper and lower grippers are formed of a support block and an engagement piece. The gripper rod is a rod in which a small diameter portion in the axial direction, a tapered guide surface that is expanded downward, and a large diameter portion having an engagement surface are repeatedly provided, and the engagement piece of the gripper is interlocked with the reciprocation of the piston. A hanging device having a gripper opening / closing mechanism that releases the engagement between the engagement piece and the engagement surface of the gripper rod, wherein the lower gripper opening / closing mechanism moves the engagement piece of the lower gripper outward. A first urging member for urging, a first urging member for urging the engaging piece inward to engage the engaging surface of the gripper rod, and Rising And a first drive member that separates the first pressing member from the engagement piece as a drive force, and wherein the upper gripper opening / closing mechanism biases the engagement piece of the upper gripper outward. A member, a second pressing member that presses the engaging piece inward and engages the engaging surface of the gripper rod, and a lowering movement from a position immediately before the lower limit of the upper gripper to the lower limit as a driving force, And a second driving member for separating the second pressing member from the engagement piece.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS.

The apparatus of the present invention includes a center hole jack (5) and a gripper rod (6) having the same configuration as the jack shown in FIG.
0) and an upper gripper opening / closing mechanism (21). In the following description, the same members and elements as those of the lifting device using the jack shown in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 shows a schematic structure of the lower gripper opening / closing mechanism (20) and the upper gripper opening / closing mechanism (21). The left side of the drawing is the lower gripper opening / closing mechanism (20), and the right side of the drawing is the upper gripper opening / closing mechanism (21).

The lower gripper opening / closing mechanism (20) is, as shown in FIGS. 1 and 2, a jack piston (not shown).
As a result, the upper gripper (4) rises, and the ascending movement from the position B immediately before the upper limit A to the upper limit A is used as a driving force to move the engagement piece 7 of the lower gripper (3) to the gripper rod (6). It is retracted from the position of engagement with the bulging portion (11).

The lower gripper opening / closing mechanism (20) is composed of a telescopic member (23) that can expand and contract in the axial direction, and a transmission wire (2) disposed between the lower end of the telescopic member (23) and the lower gripper (3).
4).

The elastic member (23) comprises a hollow cylindrical outer member (25) and an inner member (26) inserted into the inner diameter portion thereof.
(It is also possible to use a triple tube or more). The upper end of the inner member (26) is fixed to the upper gripper (4), and moves up and down following the upper gripper (4). At the lower end of the inner member (26), a flange portion (27) that protrudes in the radial direction and that can move the inner diameter portion of the outer member (25) in the axial direction is attached.
At the upper end of the outer member (25), a pressure receiving portion (29) is provided which is axially engageable with the flange portion (27).
The pressure receiving portion (29) and the flange portion (27) are arranged in a positional relationship such that the upper gripper (4) is engaged when the upper gripper (4) reaches a position B immediately before the upper limit (FIG. The state immediately before the operation). The axial length of the outer member (25) is such that even when the upper gripper (4) reaches the lower limit position D, the flange portion (27) has the lower end wall (25) of the outer member (25).
The length is determined according to the axial length of the inner member (26) and the stroke of the jack cylinder (2) so that the inner member (26) does not abut.

The transmission wire (24) connected to the lower end of the outer member (25) is turned horizontally by a pulley (30) and connected to the engagement piece (7) of the lower gripper (3). . An elastic member (31) for opening / closing timing adjustment is interposed in the middle of the transmission wire (24).

The outer member (25) is supported on a stationary member, for example, a support (34) fixed to a cylinder case (33) via a spring (32). In this way, the outer member (25) is supported by the spring (32) because the outer member (25) does not follow up due to friction between the inner member (26) and the flange portion (27) when the inner member (26) is raised. Therefore, other supporting structures may be used as long as they have such a function.

As shown in FIG. 2, the lower gripper (3)
It has an engagement piece (7) that engages with the engagement surface (13) of the gripper rod (6) and supports it from below. The engagement piece (7) is placed on a support surface (36a) provided inside a support block (36) fixed to the base (1), and has an outer end surface (7a). One end of the transmission wire (24) is connected via a pulley (37). The support surface (36a) of the support block (36) is formed as a tapered surface that is more distant from the axis of the gripper rod (6) as it goes upward, and the engagement piece (7) is guided by the support surface (36a). Between the inner lower side and the outer upper side, that is, an engaging position (shown by a solid line) that engages with the engaging surface (13) of the gripper rod (6), and a retracting position (shown by a broken line) that retreats from the engaging position. ). The outer end face (7a) of the engagement piece (7) and the support block (3
6) An urging member (39) such as a coil spring for constantly urging the engagement piece (7) elastically inward is disposed between the protrusion (36b) provided on the upper surface.

The engaging pieces (7) are usually provided at four equal positions around the gripper rod (6) (only two are shown in the drawing), but the number is arbitrary.
It may be arranged at one to three places or at five or more places.

The lower gripper opening / closing mechanism (20) is provided individually for each engagement piece (7), and is also provided only at one location, and branches the transmission wire (24) to each engagement piece (7). You may make it connect.

In the above configuration, when the upper gripper (4) is located in a section other than the section between the position immediately before the upper limit B and the upper limit position A, the pressure receiving portion (29) provided at the upper end of the outer member (25). ) And the flange portion (27) of the inner member (26) are separated from each other. In this case, since no pressing force acts between the two, the engagement piece (7) of the lower gripper (3) moves to the inner engagement position by the urging force of the urging member (39),
The gripper rod (6) is locked by engaging with the engagement surface (13) of the gripper rod (6).

On the other hand, the upper gripper (4)
While moving in the section between the upper limit position A and the pressure receiving portion (29), the flange portion (27) is engaged, and the pressure receiving portion (29) is moved upward by the upper gripper (4). (2
7) To receive a pressing force upward from the outer member (2)
7) rises. Accordingly, an outward traction force acts on the engagement piece (7) of the lower gripper (3) via the transmission wire (24), so that the engagement piece (7) is supported by the support block (36).
Slides on the support surface (36a), and moves to the retreat position. After the upper gripper (4) reaches the upper limit position A, the retracted state is continued until the upper gripper (4) that has started descending returns to the position B just before the upper limit. By adjusting the elastic force of the elastic member (31) provided on the transmission wire (24), it is possible to adjust the timing at which the lower gripper (3) retracts from the engagement position and the timing at which the lower gripper (3) returns to the engagement position. Can be.

The structure of the lower gripper opening / closing mechanism (20) is not limited to the structure shown in FIG. 1, but includes a first lifting member (41) that moves up and down at least following the upper gripper (4).
While the upper gripper (4) moves between the upper limit A and the position B immediately before the upper gripper (4), the pressure receiving portion (29) which receives a pressing force from the first elevating member (41) and moves up and down together with the first elevating member (41). )
And a first transmission member (42) for transmitting the upward movement of the pressure receiving portion (29) to the engagement piece (7) of the lower gripper (3) and retracting the engagement piece (7) from the engagement position. It is sufficient to have In FIG. 1, the inner member (26) of the telescopic member (23) corresponds to the first elevating member (41), and the outer member (25) and the transmission wire (24) correspond to the first transmission member (42). Equivalent to.

Further, in FIG. 1, the elastic member (31) for adjusting the opening / closing timing is provided in the middle of the transmission wire (24). As shown in FIG.
It may be provided between the flange portion (27) and the pressure receiving portion (29) (between the first elevating member (41) and the pressure receiving portion (29)). ) And the transmission wire (24) or between the transmission wire (24) and the lower gripper (3). That is, the elastic member (31) is moved from the first pressing member (41) to the pressure receiving portion (2).
9) and any part up to the lower gripper (3) via the first transmission member (42).

Next, as shown in FIG. 1, the upper gripper opening / closing mechanism (21) moves the upper gripper (4) to its lower limit position D.
The upper gripper (4) is retracted from the engagement position with the bulging portion (11) of the gripper rod (6) by using the downward movement from reaching the position C just before to the lower limit position D as a driving force. is there.

A through hole (45) is formed in the outer peripheral portion of the upper gripper (4), and a vertically moving rod (46) is inserted through the through hole (45) so as to be vertically movable. A disk-shaped projection (47) is fixed above the upper gripper (4) of the lifting rod (46).
7), one end of a transmission wire (49) is attached. A support member (50) made of a spring or the like is arranged between the protrusion (47), the upper gripper, and (4), and the lifting rod (46) moves the support member (50) with respect to the upper gripper (4). 50) so as to be elastically displaceable in the vertical direction.

At the lower end of the lifting rod (46), a disk-shaped engaging portion (51) is provided. This locking portion (51)
When the upper gripper (4) reaches the position C immediately before the lower limit, the upper gripper (4) is arranged in a positional relationship such that it contacts the upper surface (52: regulating portion) of the base (1). In the drawings, the case where the upper surface of the base (1) is a restricting portion (52) is illustrated, but the restricting portion (52) only needs to be provided on a stationary member, for example, from the cylinder case (33) to the side thereof. The arm may protrude in the direction, and the contact portion of the arm with the locking portion (51) may be used as the regulating portion (52).

The locking portion (51) has a lower end formed on the base (1).
And is inserted into the inner diameter of a cylindrical guide member (53) fixed to the guide member. The guide member (53) may have any structure as long as it can guide the locking portion (51) in the up-down direction, and is not limited to a cylindrical shape as shown.

The transmission wire (49) extends downward from the protruding portion (47) to engage with an engagement piece (not shown) of the upper gripper (4).
It is connected to the. The upper gripper (4) has the same configuration as the lower gripper (3) shown in FIG. 2 (not shown), and one end of the transmission wire (49) is engaged inward by the biasing member. It is connected to the outer end face of the piece (9). In the middle of the transmission wire (49), the lower gripper opening / closing mechanism (2
Elastic member (55) for adjusting the opening / closing timing in the same manner as in (0).
Is interposed.

In the above configuration, when the upper gripper (4) is located in a section other than the section between the immediately preceding lower limit position C and the lower limit position D, the lifting rod (46) interlocks with the upper gripper (4). Go up and down. At this time, since the locking portion (51) and the restricting portion (52) are separated from each other, the engaging piece (9) of the upper gripper (4) is urged inward, and the gripper rod (6). The gripper rod (6) is locked by engaging with the engaging surface (13) of the gripper.

When the upper gripper (4) during lowering reaches the position C just before the lower limit, the locking portion (51) comes into contact with the restricting portion (52), and further lowering of the lifting rod (46) is restricted. . Therefore, until the upper gripper (4) moves from the position immediately before the lower limit C to the lower limit position D, the upper gripper (4)
The transmission wire (49) is towed by the descent, and the engagement piece (9) of the upper gripper (4) is pulled outward and moves to the retracted position. This retreat state is continued until the upper gripper (4) reaches the lower limit position D and then moves up to return to the position C immediately before the lower limit. In this case, by adjusting the elastic force of the elastic member (55) provided on the transmission wire (49), the timing at which the lower gripper (3) retracts from the engagement position and the timing at which the lower gripper (3) returns to the engagement position is adjusted. be able to.

The structure of the upper gripper opening / closing mechanism (21) is not limited to the structure shown in FIG. 1, but includes at least a second lifting member (56) which moves up and down in conjunction with the upper gripper (4);
A regulating portion (52) for regulating the downward movement of the second elevating member (56) while the upper gripper (4) moves between its lower limit D and its immediately preceding position C; and a second elevating member (56). ) Is transmitted to the engagement piece (9) of the upper gripper (4) while the downward movement of the upper gripper (4) is restricted, and the engagement piece is bulged out of the gripper rod (6). It suffices if it is constituted by the second transmission member (57) retracted from the position of engagement with the portion (11).

A suspension procedure using the apparatus of the present invention will be described.

When the upper gripper (4) is raised (see FIG. 9B) and reaches the position B immediately before the upper limit, as shown in FIG.
The flange portion (27) and the pressure receiving portion (29) are engaged. Subsequently, when the upper gripper (4) is raised to the upper limit position A, the outer member (25) is raised, and the engagement piece (7) of the lower gripper (3) pulled by the wire (24) moves outward. Then, the engagement state between the engagement piece (7) and the gripper rod (6) is released. This state is maintained until the upper gripper (4) descends after reaching the upper limit position A and returns to the position B immediately before the upper limit. When the upper gripper (4) is lowered from the upper limit position A, the gripper rod (6) locked by the upper gripper (4) also starts to drop, but the lower gripper (3) is moved until the upper limit position B is reached. Since it is open, the engagement surface (13) and the lower gripper (3) do not interfere with the lowering of the gripper rod (6).

When the upper gripper (4) passes through the position B immediately before the upper limit, the flange portion (27) and the pressure receiving portion (29) separate from each other, and accordingly, the outer member (25) descends to lower the gripper (3). Are about to be closed by the urging force of the urging member (39). At the moment of the closing, the engagement piece (7) of the lower gripper (3) is connected to the large diameter portion (14) of the gripper rod (6).
The elastic member for opening / closing timing adjustment (3
Adjust the elastic force of 1). The gripper rod (6) also descends in conjunction with the lowering of the upper gripper (4), and the engagement piece (7) of the lower gripper (3) is moved to the large diameter portion (14) of the gripper rod (6) and the tapered guide surface ( 12) Slip on and the gripper rod (6) descends.

While the upper gripper (4) is descending, the gripper rod (6) is locked by the lower gripper (3) (see FIG. 9C). When the upper gripper (4) reaches the position C just before the lower limit,
The locking portion (51) of the upper gripper opening / closing mechanism (21) comes into contact with the restricting portion (52), and the subsequent lowering of the lifting rod (46) is restricted, and one end of the transmission wire (49) is held at the stationary position. Is done. When the upper gripper (4) is further lowered, a traction force acts on the transmission wire (49), and the upper gripper (4)
Of the gripper rod (6) moves outward.
Is released.

Between the time when the upper gripper (4) reaches the lower limit position D and the time when it rises again and reaches the position C just before the lower limit,
The engaging piece (9) of the upper gripper (4) tends to return inward by the urging force, but here, as in the case of the lower gripper (3), the elastic member (5) interposed between the transmission wires (49).
If the elastic force of 5) is adjusted, the engaging piece (9) can be returned inward when facing the large-diameter portion (14).

Thereafter, when the upper gripper (4) is lifted, the gripper rod (6) stops while supporting the suspension load with the lower gripper (3), while the upper gripper (4) is moved to the gripper rod (6). ) Rises while sliding on the large diameter portion (14) and the tapered guide surface (12) (see FIG. 9D).

One cycle is completed by the above procedure, during which the gripper rod (6) is lowered by one pitch. Thereafter, by repeating this, the suspended object can be intermittently lowered.

As described above, according to the present invention, by simply adding the opening and closing mechanisms (20) and (21) for the upper and lower grippers to the conventional apparatus, the apparatus can be diverted to a suspension apparatus, so that applications can be expanded. it can. Further, since the upper and lower grippers (4) and (3) can be opened and closed by using the driving force of the piston without using a dedicated driving device, equipment costs and operating costs are suppressed. In addition, when the above-mentioned lifting device is used for lifting or press fitting, it can be easily coped with simply by making each wire (24) (49) and the upper gripper (4) in a non-connected state.

As shown in FIG. 2, upper and lower grippers (4)
The contact surface (support surface 36a) between the engagement pieces (9) and (7) and the support block (36) in (3) is an inclined surface. If the contact surface is horizontal, the heavy load of the lifting object acts downward on the gripper rod (6), so that the engagement pieces (7) and (9) receiving the load of the gripper rod blow laterally. This is because there is a fear.

However, when the contact surface is an inclined surface, the engagement piece (7) is smaller than the towing distance by the wires (24) and (49).
Since the moving distance in the radial direction of (9) is short, the moving amount of the engaging pieces (7) and (9) is not sufficient, which may hinder the smooth opening and closing of the upper and lower grippers (4) and (3). is there.

Therefore, as shown in FIGS. 4 and 5, each of the transmission wires (24) and (49) of the upper and lower gripper opening / closing mechanisms (20) and (21) is connected to the transmission wire (24).
In (49), the amount of movement on the gripper side is increased by the upper gripper (4).
Speed increasing means (60a) (60
This problem was solved by interposing b). FIG. 4A shows the speed increasing means (60a) of the lower gripper opening / closing mechanism (20). This uses a lever (61) as a speed increasing means.
Upper gripper (4) side of transmission wire (24) (outer member 2
5) is connected to the shorter end of the arm (63) supported by the fulcrum (62) (the end with the shorter distance from the fulcrum 62) and the lower gripper (3) of the transmission wire (24). Side is connected to the long end of the arm (63). 4A shows a case where the wire (24) on the upper grip (4) side is replaced with a U-shaped rigid body (64), and FIG. 4B shows an example where the wire is used as it is. In such a configuration, when the outer member (25) rises, the arm (63) falls rightward as shown by a two-dot chain line, so that the moving distance of the transmission member (24) on the lower gripper (3) side is increased. The engagement piece (7) can be quickly retracted from the engagement position.

FIG. 5 shows another example of the speed increasing means (60b) of the upper gripper opening / closing mechanism (21). This speed increasing means uses a lever (61), connects the lifting rod (46) side of the transmission wire (49) to the short end of the arm (63), and connects the upper gripper (4) side. Connected to the long side end.

FIG. 6 shows an example in which a gear (66) is used as the speed increasing means. FIG. 6A shows the case of the lower gripper opening / closing mechanism (20), and FIG. 6B shows the case of the upper gripper opening / closing mechanism (21). .

In each case, the relative vertical movement between the grippers (3) and (4) and the outer member (25) and the vertical rod (46) is converted into a rotary motion via a rack and pinion (68). The movement is accelerated using a plurality of gears (60) (70) to pull the wires (24) (49).

FIGS. 7 and 8 show another embodiment of the suspension device. The lower gripper opening / closing mechanism (2
As shown in FIG. 7, a first urging member (72) made of, for example, an extended spring pulls an engagement piece (7) disposed on the support block (36) outward, as shown in FIG. A first pressing member (73) contacting the engagement piece (7) from above;
And a first elastic member (74) made of, for example, an extended spring, which pulls the first pressing member (73) downward. The first elastic member (74) and the first biasing member (7
The elastic force of (2) is set to be larger in the first elastic member (74), and therefore, the engaging piece (7)
Is normally pressed downward by the first pressing member (73), displaced inward and engaged with the engagement surface (13) of the gripper rod (6).

As shown in FIG. 8, between the first pressing member (73) and the upper gripper (4), a rod-shaped first member is provided.
The driving member (75) is disposed. First drive member
The lower end of (75) is fixed to the first pressing member (73), and the upper end thereof passes through the upper gripper (4) movably in the up-down direction. A flange-shaped engaging portion (76) is fixed to the upper end of the first driving member (75). In this engaging portion (76), the upper gripper (4) reaches the position B just before the upper limit A. Incidentally, the upper gripper (4) is disposed at a position where it engages with the upper surface.

With the above configuration, before the upper gripper (4) reaches the position B immediately before the upper limit, the first pressing member (73) is pulled downward by the elastic force of the first elastic member (74). Therefore, the engagement piece (7) is guided by the support surface (36a) of the support block (36) and is at the inner engagement position. When the upper gripper (4) reaches the position B immediately before the upper limit, the engagement portion (7
6) engages with the upper surface of the upper gripper (4), so that the first drive member (75) rises following the upper gripper (4), and further the first pressing member (73) rises. As a result, the engagement piece (7) is pulled outward by the elastic force of the first urging member (72) and moves to the retracted position. From the above, the same function as the lower gripper opening / closing mechanism (20) shown in FIG. 1 can be exhibited.

Although not shown, the upper gripper opening / closing mechanism (21), like the lower gripper opening / closing mechanism, has a second urging member for pulling the engaging piece (9) outward, and an engaging piece ( 9)
A second pressing member (77) contacting the second pressing member (77) from above, and a second elastic member for pulling the second pressing member (77) downward. A rod-shaped second driving member (78) is mounted on the lower surface of the second pressing member (77), and an engaging portion (79) is mounted on the lower end of the second driving member (78). Have been. The engaging portion (79) is arranged in a positional relationship such that when the upper gripper (4) reaches the position C just before the lower limit D, it contacts the support portion (80) fixed to the cylinder case (33). According to the above configuration, the engagement piece (9) can be moved in and out of the engagement position using the downward movement of the upper gripper (4) from the position immediately before the lower limit C to the lower limit D as a driving force.

[0057]

According to the present invention, by adding a mechanism for opening and closing the upper and lower grippers to the conventional device, the engagement piece is retracted from the engagement position in conjunction with the reciprocation of the piston.
It is possible to suspend heavy objects. Since the upper and lower grippers are opened and closed by using the reciprocating motion of the jack piston without using a dedicated driving device, manufacturing costs and operating costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a suspension device according to the present invention.

FIG. 2 is an enlarged sectional view of a lower gripper.

FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 4 is a side view of a speed increasing means (lever) of the lower gripper opening / closing mechanism.

FIG. 5 is a partial side sectional view of a speed increasing means (lever) of the upper gripper opening / closing mechanism.

FIG. 6 is a side view of a speed increasing means (gear) of the vertical gripper opening / closing mechanism.

FIG. 7 is a sectional view showing another embodiment of the lower gripper opening / closing mechanism.

FIG. 8 is a partial side sectional view showing another embodiment of the present invention.

FIG. 9 is a sectional view showing a lifting procedure of the lifting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Cylinder 3 Lower gripper 4 Upper gripper 5 Jack 6 Gripper rod 7 Engagement piece 9 Engagement piece 11 Swelling part 12 Tapered guide surface 13 Engagement surface 14 Large diameter part 17 Piston 20 Lower gripper opening / closing mechanism 21 Upper gripper opening / closing mechanism Mechanism 26 first elevating member 29 pressure receiving part 31 elastic member 42 first transmitting member 46 second elevating member 49 second transmitting member 52 regulating part 55 elastic member 60a / 60b speed increasing means 61 lever 66 gear mechanism 72 1 urging member 73 first pressing member 75 first driving member

Claims (3)

(57) [Claims] An upper gripper comprising a center hole jack, an upper gripper provided at an end of a piston of the center hole jack, a lower gripper provided at a lower portion of a jack cylinder, and a gripper rod inserted into the center hole jack. Consists of a support block and an engagement piece slidable on the support block, and the gripper rod is provided with a small diameter portion in the axial direction, a tapered guide surface having an enlarged diameter downward, and a large diameter portion having an engagement surface repeatedly. A lower gripper opening mechanism and an upper gripper opening / closing mechanism that retreat the engagement pieces of the upper and lower grippers from the engagement position and release the engagement with the gripper rod in conjunction with the reciprocation of the piston of the center hole jack. A transmission for transmitting the reciprocating motion of the piston of the center hole jack of the upper and lower gripper opening / closing mechanism to the engagement piece. Zuph was apparatuses each elastic member for opening and closing timing adjusting are interposed in the member. 2. The suspension apparatus according to claim 1, wherein the transmission member is provided with speed increasing means for increasing the moving speed on the gripper side more than the elevating speed of the piston. 3. The suspension device according to claim 1, wherein the support block has an inclined surface, and the engaging piece is placed on the inclined surface.