JP2000309487A - Clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a long material from jumping out of the opening of a fixed jaw to the outside of a clamp during applying impact to the long member. SOLUTION: A clamp includes a clamp main body 1, a fixed jaw 2 with one end connected to the clamp main body 1 and the other end open in a space to the clamp main body 1, a movable jaw 5 arranged so as to be protruded or retracted into or out of the clamp main body 1 toward the fixed jaw 2, a reciprocating member 7 arranged on the side face of the clamp main body 1 so as to freely reciprocate in association with the movable jaw 5 and a stopper 9 for preventing the movement of the reciprocating member 7 to the retracting in direction when the reciprocating member 7 is protruded out of the clamp main body 1 to close an opening portion 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp for holding a long steel material such as a pipe or a bar and suspending it from a crane hook.

[0002]

2. Description of the Related Art Conventionally, clamps for holding long steel materials such as pipes and bars and suspending them from crane hooks have been frequently used at construction sites. This type of clamp projects from one side of the main body and has an opening on the other side, and a substantially hook-shaped support member through which an elongated steel material can be inserted is used as a fixed jaw. The long steel material taken into the portion is strongly pressed against the fixed jaw by the movable jaw projecting from the main body, and the long steel material is sandwiched between the fixed jaw and the movable jaw.

[0003] The clamp suspended by the lift arm in such a state is transported to a predetermined place while holding the long steel material, and the long steel material is captured by an operator when the clamp reaches the predetermined place. Lower the lift arm to the point. Then, when the worker pulls the string connected to the movable jaw when the long steel material is captured, the movable jaw is immersed in the main body to release the long steel material, and thereafter, the worker moves the movable steel member to a predetermined position. Long steel materials will be incorporated.

When the lift arm is lowered in the operation of the lift, the lift arm is bent by the load of the long steel material, and the downward inertial force acts on the falling steel material. Therefore, before the lower end of the long steel material contacts the floor surface of the ground or the installation place, it is necessary to stop the lift arm at a height that takes into account the deflection of the lift arm due to the inertial force. The lower end of the long steel material may be accidentally hit on the ground or floor.

[0005] In this case, the long steel material jumps greatly as a reaction, giving a force in the immersion direction to the movable jaw, and greatly reduces the clamping force of the movable jaw to zero. As a result, there is a danger that the long steel material that is not clamped may come off the opening of the fixed jaw, jump out of the clamp, and cause an unexpected accident.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. Even if a movable jaw is immersed by an impact force applied to a long steel material, the long steel material is not pinched. It is an object of the present invention to prevent a long steel material from jumping out of a clamp from an opening portion of a fixed jaw even in such a state.

[0007]

According to a first aspect of the present invention, there is provided a clamp (A) in which a clamp body (1) and an inner surface (3) on the clamp body (1) side are formed in a concavely curved shape. , One end of which is connected to the clamp body (1) and the other end is the clamp body (1)
The fixed jaw (2) is opened between the clamp jaw (2) and the clamp jaw (1). A movable jaw (5) for holding the (4) and releasing the elongated member (4) when immersed, and a reciprocatingly movable arrangement on the side of the clamp body (1) in conjunction with the movable jaw (5). When protruding from the clamp body (1), the protruding portion (8) closes the opening (6) of the fixed jaw (2), and when immersed, the reciprocating member (7) that opens the opening (6). The reciprocating member (7) protrudes from the clamp body (1) and the opening (6)
And a stopper (9) for preventing the reciprocating member (7) from moving in the immersion direction.

According to this, when the long member (4) is clamped and fixed, the opening portion is formed by the action of the reciprocating member (7) projecting.
Since (6) is closed, even if an impact load is applied to the long member (4) and acts in a direction to weaken the holding force, the long member (4) moves to the opening (6) side and Attempts to drop from the clamp (A) are hindered by the protruding portion (8) of the reciprocating member (7), so that the elongated member (4) is prevented from dropping.

Further, the reciprocating member (7) is interlocked with the movable jaw (5), and the reciprocating member (7) in the protruding state is prevented from moving in the immersion direction by the stopper (9). Therefore, even if a shocking load in the direction of weakening the holding force is applied to the long member (4) as described above, the stopper (9) works,
Even if the movable jaw (5) moves in the immersion direction, it returns to the protruding direction at the next moment and the long member (4) is sandwiched again, so that the holding force does not decrease.

"Claim 2" is a clamp according to claim 1.
(A) is described in further detail, `` The reciprocating mechanism (10) of the reciprocating member (7) is a rotary shaft (12) of a drive mechanism (11) of the movable jaw (5).
Gear trains (13a) and (13b) attached to the gear trains (13a) and (13a).
b) and a linear gear (14) that meshes with
(9) protrudes and sinks into the reciprocating path (15) of the reciprocating member (7). "

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to illustrated embodiments. The clamp body (1) includes a body case (16) and a drive mechanism (11) housed therein. The body case (16) is provided on both side plates (16a), the bottom plate (16b) provided on the bottom and the fixed jaw (2) side, and an operation hole for the movable jaw (5) to protrude and sink. (16d).

In the present embodiment, the fixed jaw (2) is formed in three steps, upper and lower, is substantially J-shaped, and its inner surface (3) is formed in a concave curved shape, and one end thereof is clamped. The other end is connected to the main body (1), and the other end is open between the main body (1) and the clamp main body (1).

The movable jaw (5) is formed by two pieces, and the front half of the movable jaw protrudes and sinks from the clamp body (1) toward the fixed jaw (2) to attach the long member (4) to the fixed jaw (4). 2) and a clamp portion (5a) for clamping and fixing, and a rear half portion is constituted by a cam portion (5b) that slides and engages with a drive cam (18) of a drive mechanism (11) described later. And the side plate (1
It is attached to 6a).

The clamp surface (5c) of the clamp portion (5a) is formed in a semicircular shape and is notched, and as shown in FIG. 5, the opening (6) side projects obliquely with respect to the opposite side. The long member (4) in the sandwiched state is connected to the opening (6).
On the other side.

The drive mechanism (11) comprises the drive cam (18), the link rod (19), the hanging part (20), the main operating rod (21), and the auxiliary operating rod (22). The suspension part (20) is composed of a single bar, a through hole (20a) for suspension is drilled at the upper end, and a through hole (20b) for the guide shaft (23) is drilled at the lower end. I have. The upper end of the link rod (19) and the spacer (24) are attached to the guide shaft (23) inserted through the guide shaft through hole (20b) on both sides of the suspension part (20), and the guide Both ends of the shaft (23) are vertically formed guide grooves (25) on the inner surface of the side plate (16a).
It is fitted so that it can go up and down.

The link rod (19) is rod-shaped and has a movable jaw (5).
, The lower end of which is rotatably pivotally attached to a working shaft (26) provided on a cam portion (5b) behind the fulcrum shaft (17), and When the fulcrum shaft (1
With the fulcrum 7) as a fulcrum, the clamp portion (5a) operates so as to project from the operation hole (16d).

The driving cam (18) is rotatably mounted on a rotating shaft (12) attached to the side plate (16a).
(18a) slides or engages with the cam portion (5b) of the movable jaw (5). The drive cam (18) and the cam portion (5b) are connected by a spring (27), and the spring action of the spring (27) controls the movable jaw (5) to fall. (28) and (29) are spring hooks.

The main operating rod (21) is coaxial with the driving cam (18) and is pivotally mounted on the rotating shaft (12). An engaging recess (30) provided on one side of the main operating rod (21). ) Is engaged with a spring hook (29) of the drive cam (18) so as to slide. In addition, the main operating rod (2
A sub-operating rod (22) is pivotally attached to a free end opposite to the pivot portion with respect to the rotation shaft (12) of (1) so that it can be turned upside down. (31) is a stopper which is engaged when the main operating rod (21) is raised.

The sub-operating rod (22) is a substantially rectangular member, one end of which is pivotally attached to the free end of the main operating rod (21) as described above, and the other end of which is a string such as a wire. A shape (32) is attached.

Next, the reciprocating member (7), the reciprocating drive mechanism (10) for operating the reciprocating member, and the stopper (9) for regulating the release of the reciprocating member (7) will be described. The main structure of the reciprocating mechanism (10) is a gear (13a) coaxially mounted on the rotating shaft (12) of the drive mechanism (11) of the movable jaw (5), a gear (13b) meshing with the gear (13b), and the gear. Linear gear meshing with (13b)
(14). The linear gear (14) is mounted on the reciprocating member (7), and rotates with the rotation of the gear (13a).
(7) reciprocates on the reciprocating path (15).

The reciprocating path (15) includes a guide bottom plate (33) attached to the side plate (16a) on the side of the opening (6) and a guide bottom plate (3).
The guide side plate (34) attached to 3). Therefore, the upper surface side and both front and rear surfaces of the reciprocating path (15) are open. The linear gear (14) of the reciprocating member (7) disposed reciprocally in the reciprocating path (15) is connected to the reciprocating path (1).
5) meshes with the gear (13b) at the open portion on the upper surface side.

A reciprocating member is provided on the side surface of the guide side plate (34).
A slot (35) is formed in the reciprocating direction of (7), and the guide pin (36) attached to the reciprocating member (7) is
5) It is slidably fitted in the reciprocating member
(7) does not protrude from the reciprocating path (15).

The stopper (9) is vertically slidably mounted on a mounting block (37) mounted on the lower surface of the guide bottom plate (33), and has a flange (3) formed in the middle.
8) and a lower lid (39) attached to the lower surface of the mounting block (37) .The lower lid (39) is urged upward by a spring (40). When the attached string-like body (43) is not pulled, the tip of the string-like body (43) projects from the stopper through-hole (42) formed in the guide bottom plate (33) into the reciprocating path (15). ing.

The string-like body (43) is attached to the side plate (16a) so as to be inserted into a through hole (44) formed at the rear end of the bottom plate (16b) of the main body case (16). It is hung over the rolls (45) and (46). Thereby, the string-like bodies (32) and (43) can be bundled and operated.

The long member (4) to be clamped is, for example, a bar steel used at a construction site, and has various thicknesses from a thin one to a thick one.

Next, the operation of the present invention will be described. The clamp (A) according to the present invention, which is suspended from a crane arm (not shown), is transferred to the place where the long member (4) is placed. At this time, the cam surface (18a) of the driving cam (18) comes into contact with the cam portion (5b) of the movable jaw (5) and the cam portion (5b) is pushed down as shown in FIG. The movable jaw (5) is immersed in the main body case (16). At this time, the engaged state is maintained by the tension of the spring (27).

The engaging recess (30) of the main operating rod (21) which is pulled down is engaged with the spring hook (29) of the drive cam (18). In this state, the long member is opened from the opening (6) of the fixed jaw (2).
Insert (4) and pull up the main operating rod (21) to
9) is pushed by the engagement recess (30) and rotates around the rotation axis (12). Then, the cam surface (18a) of the drive cam (18) slides on the cam portion (5b), but rotates from the point of contact with the cam surface (18a) of the drive cam (18), that is, from the engagement point (P). The distance (L) to the shaft (12) gradually decreases with rotation, so that the cam (5b) pulled by the spring (27) rotates upward of the spring hook (29) of the drive cam (18). The clamp portion (5a) is pushed up toward the fixed jaw (2) as a reaction as a result.

When the main operating rod (21) is continuously pushed up, the spring extended in accordance with the rotation of the drive cam (18) is extended.
(27) is finally a straight line connecting the spring hook (28) and the rotating shaft (12)
(S) will be exceeded. At the same time, the cam portion (5b) is instantaneously pulled up by the resilient force of the instant spring (27), and at the same time, the driving cam (18) further rotates to engage the engaging recess of the main operating rod (21).
(30) comes into contact with the engagement stopper (31) and stops.

On the other hand, the movable jaw (5) is rapidly rotated by pulling up the cam portion (5b), and the clamp portion (5a) of the movable jaw (5) is actuated by the operating hole (16d).
And the long member (4) is clamped and fixed with the fixed jaw (2). The pinching force depends on the spring force of the spring (27).

Since the lower end of the link bar (19) is pivotally mounted on the cam portion (5b) side of the movable jaw (5), the movable bar (5) is suspended by the link bar (19) with the rotation of the movable jaw (5). The lower part (20) is a guide groove
The movable jaw (5) stops rotating when it is pushed out of the main body case (16) along (25) and the clamp portion (5a) is pressed against the long member (4).

After the long member (4) is clamped and fixed in this way, the crane arm is pulled up, and the clamp (A) is pulled up while holding the long member (4). As a result, the weight of the clamp (A) and the long member (4) is added to the suspension part (20), and the weight is converted into a rotational force in the pressing direction of the movable jaw (5) via the link rod (19). The pressing force will increase.

On the other hand, on the side of the reciprocating drive mechanism (10), the drive cam
With the rotation of (18), the gear (13a) fixed coaxially with the drive cam (18) rotates in the same direction as the rotation of the drive cam (18). Then, the linear gear (14) moves to the fixed jaw (2) side via the gear (13b) meshing with the gear (13a), and projects the protruding portion (8) of the reciprocating member (7). The fixed jaw (2) is made to protrude from the front end of the main body case (16) toward the fixed jaw (2), and the opening (6) of the fixed jaw (2) is closed.

The reciprocating member (7) projects, and the reciprocating member
(7) When the rear end of the stopper (9) exceeds the stopper (9), the tip of the stopper (9) protrudes from the guide bottom plate (33) into the reciprocating path (15) due to the elastic force of the spring (40), and the reciprocating member (7) Retreat is prevented.

In this state, the long member (4) is clamped.
The long member (4) is transported to a predetermined place such as a reinforcing bar arrangement site or an installation place by suspending it while holding it in the state (A). When arriving at the specified place, stop the crane arm and operate the crane to lower the clamp (A). The lower end of the long member (4) stops the crane arm immediately above the predetermined location.

Normally, the crane operator instantaneously judges the amount of bending of the crane arm when stopped from experience, and stops the crane arm at a position where the long member (4) does not contact the ground or floor at the place where it is arranged. In the case of a skilled person, even a skilled person may cause the long member (4) to come into contact with the ground or the floor surface due to a determination error. Alternatively, there is a case where the long member (4) is brought into contact with an intermediate structure while being transported while being held by the clamp (A). In such a case, a shocking force is applied to the long member (4). If this impact load is, for example, a force in the direction of pushing the movable jaw (5) back to the clamp body (1) side, the movable jaw (5) is slightly rotated momentarily, the clamping force is weakened, and the long member ( 4) tries to come off.

In such a case, in the conventional example, the long member (4)
May protrude from the opening (6) of the fixed jaw (2), but in the case of the present invention, regardless of the movement of the movable jaw (5), the projecting portion (8) of the reciprocating member (7) ) Fixed jaw (2)
Since the opening (6) is closed, the elongate member (4) is prevented from protruding from the opening (6).

Further, the string-like body (32) may come into contact with the structure or become entangled with the structure during transportation, and may be pulled. In such a case, in the conventional example, as shown later, the state shown in FIG. 1 is reached, and the movable jaw (5) is completely returned to release the clamping / fixing. There is no.

That is, when the string-like body (32) is pulled, the main operating rod (21) tends to turn in the direction of falling down (counterclockwise of the rotating shaft (12) in FIG. 2). Is the main operating rod as described above.
(21) is meshed with the linear gear (14) of the reciprocating member (7) by the reciprocating mechanism (10).

As a result, even if a force in the falling direction is applied to the main operating rod (21), the reciprocating member in the protruding state is in the protruding state.
Since the stopper (9) is engaged with the rear end of (7), the reciprocating member (7) does not retreat, and the reciprocating mechanism (10) does not operate. As a result, the rotational movement of the main operating rod (21) in the falling direction is prevented, and also in this case, the arrowhead opening (6) is kept closed by the protruding portion (8) of the reciprocating member (7), and is elongated. Element
(4) is prevented from jumping out. In this way, even if there is a trouble during the transfer or a trouble at the time of stopping, the long member (4) is prevented from being detached from the opening (6) of the clamp (A) and the long member ( 4) can be transferred.

When a predetermined transfer place is reached, the crane arm is lowered while calculating the bending of the crane arm as described above. When the crane arm stops, the operator secures the long member (4), and then grasps the two cords (32) and (43) simultaneously and pulls them. Then, in the string-like body (43), the stopper (9) is pulled down against the spring (40), and the tip end of the stopper (9) sinks down from the bottom surface of the guide bottom plate (33) and moves back and forth.
Make (15) free.

On the other hand, on the side of the string (32), the tension of the string (32) is transmitted to the main operating rod (23) via the sub operating rod (22), and the main operating rod (23) rotates. At this time, the coaxial gear (13a) also rotates.
(0) is transmitted to the linear gear (14) as a function of
(7) is retracted.

At this time, since the stopper (9) is pulled down and is not located in the reciprocating path (15) as described above, the reciprocating member (7) starts to retreat freely.

On the other hand, on the drive cam (18) side, the spring hook (29) of the drive cam (18) is engaged with the engagement recess (30) of the main operating rod (23). Rotate counterclockwise around the rotating shaft (12) while extending the spring (27) in accordance with the falling movement of the main operating rod (23) and slidingly contacting the cam portion (5b) of the movable jaw (5). .

In this case, as described above, since the stopper (9) is immersed inside and the reciprocating member (7) can retreat, the gear (13a) of the reciprocating drive mechanism (10) can also rotate freely. ,
Therefore, the main operating rod (23) coaxial with the main operating rod can also freely rotate.

The driving cam is driven by the rotation of the reciprocating member (7).
The distance (L) from the contact point (P) of the (18) with the cam surface (18a) to the rotation axis (12) gradually increases with rotation, the spring (27) is extended, and the cam portion (5b) Is gradually pushed down, and as a reaction, the clamp part (5a) is
It is drawn to the (1) side to release the holding and fixing of the long member (4). At this time, the reciprocating member (7) also retreats at the same time to open the opening (6), and the elongate member (4) can be separated from the opening (6).

When the spring (27) crosses a straight line (S) connecting the spring hook (28) and the rotating shaft (12) from right to left in FIG. (S) is not returned from the left side to the right side, and the engaged state of FIG. 1 is maintained. Therefore, the clamp portion (5a) is kept immersed in the clamp body (1).

[0047]

According to the present invention, it is assumed that the reciprocating member acts to reduce the clamping force of the movable jaw due to the impact force applied to the elongate member so that the elongate member is not pinched. Also, the long member does not protrude out of the clamp from the opening of the fixed jaw. Moreover, with the function of the stopper,
Since the reciprocating member is prevented from retreating, the reciprocating member does not recede even if the cord for releasing the pinching of the movable jaw is pulled by an accident. Is secured, and the long member is prevented from jumping out of the clamp.

[Brief description of the drawings]

FIG. 1 is a front view of a clamp of the present invention in a state in which a movable jaw is immersed.

FIG. 2 is a sectional view taken along line XX of the clamp of the present invention in a state where the movable jaw is projected.

FIG. 3 is a partially cutaway rear view of the clamp of the present invention with the movable jaw immersed therein.

FIG. 4 is a rear view of the clamp of the present invention in a state in which the movable jaw is projected.

FIG. 5 is a plan view of the present invention.

[Explanation of symbols]

 (A) Clamp (1) Clamp body (2) Fixed jaw (3) Inner surface of fixed jaw (4) Long member (5) Movable jaw (6) Opening part (7) Reciprocating member (8) Projecting part (9 ) Stopper

Claims (2)

[Claims] 1. A clamp body, a fixed jaw having an inner surface on the clamp body side formed in a concavely curved shape, one end of which is connected to the clamp body, and the other end of which is open with the clamp body. A movable jaw that is disposed so as to be able to protrude and immerse from the clamp body toward the fixed jaw, holds the elongate member with the fixed jaw when protruding, and releases the elongate member when retracted, and a movable jaw on the side of the clamp body The reciprocating member is disposed so as to be capable of reciprocating movement in conjunction with the reciprocating member. A clamp, comprising: a stopper that protrudes from the main body and blocks movement of the reciprocating member in the immersion direction when the opening is closed. 2. The reciprocating operation mechanism of the reciprocating member includes a gear train mounted on a rotating shaft of a driving mechanism of the movable jaw, and a linear gear meshed with the gear train. 2. The clamp according to claim 1, wherein the clamp protrudes and sinks into the reciprocating path.