JPH0489Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is used for suspended scaffolding and other heavy objects used in construction of bridges, elevated roads, and large steel structures. This relates to a clamp hanger for hanging.

(Prior Art) When carrying out large-scale bridge construction work such as elevated expressways or the Honshi-Shikoku Bridge, it is necessary to provide suspended scaffolding for the work and other temporary equipment for suspending heavy objects. Therefore, when such temporary equipment is provided, a clamp hanger equipped with a hanging chain is generally used.

By the way, this clamp hanger generally has a structure in which a clamping bolt is provided on one of the upper and lower jaws of a metal fitting body that has upper and lower jaws, and a hanging chain is connected to the lower jaw. It is normal to have

When using this clamp hanger, for example, when constructing a suspended scaffold below a bridge girder in large-scale bridge construction work, first place the I-beams, etc. that make up the bridge girder between the upper and lower jaws of the clamp hanger. Inserting the horizontal flange portion, then tightening the tightening bolt, and clamping the horizontal flange portion between the tip of the tightening bolt and the jaw portion,
Scaffolding boards are suspended from a hanging chain connected to the lower jaw to form a so-called hanging scaffold.

(Problems to be solved by the invention) By the way, the conventional clamp hanger has the above-mentioned structure, and therefore has the following problems.

(1) The hanging load is applied directly to the lower jaw of the clamp hanger, which causes the lower jaw to bend downward. In other words, the upper and lower jaws are opened. As a result, the clamping force is weakened. There is a risk that the clamp hanger will come off if vibrations or shocks associated with construction work are applied to it.

(2) Clamping force depends on the tightness of the clamping bolt. The degree of tightening varies depending on the operator. Generally, there is a tendency to overtighten, and if it is overtightened, the work of opening the upper and lower jaws will occur as in the case of (1) above. Therefore, even in the case of a clamp with excessively tightened bolts, there is a risk that the clamp hanger itself may fall off if subjected to vibration or impact. Of course, insufficient tightening is also dangerous.

In any case, the conventional clamp hanger has a structure in which the hanging load is applied directly to the lower jaws of the upper and lower jaws of the clamp hanger, which poses a safety problem.

Therefore, the inventor of the present invention previously published Utility Model Application No. 62-041306 (publication of Utility Model Application No. 63-148740), in which the hanging load is directly applied to the upper jaw of the upper and lower jaws of the clamp hanger, and the hanging load is applied to the clamping force. We have devised an improved clamp hanger with a structure that does not weaken the clamp.

The present invention is a further improvement of this invention, and includes a clamping force increasing mechanism that automatically increases the clamping force when the hanging load exceeds a certain level, eliminating the risk of the clamp hanger falling off. The purpose is to provide

(Means for Solving the Problems) As a means for achieving the above object, the present invention provides a cam plate with a lower front end formed as a cam surface near the front end of the upper jaw of a clamp fitting having upper and lower jaws. , an upper end part of a hanging lever which is pivoted with a support shaft, has a tightening bolt screwed into the lower jaw part that corresponds to the cam surface and moves up and down in the vertical direction, and further has a hanging chain connected to the lower end; The rear end of the cam plate is pivotally supported on the upper jaw using a common support shaft, and when the hanging load applied to the hanging lever reaches a certain level or more, this support shaft is cut off, and the clamping metal fitting is attached. This is characterized in that the upper jaw portion and the suspension lever are disengaged from each other, but the rear end of the cam plate and the upper end of the suspension lever are configured as a shearing support shaft that maintains the connected state.

(Function) As explained above, in the clamp hanger of this invention, the point of application of the hanging load is set at the upper jaw of the clamp fitting, so even if the hanging load becomes overload, the upper and lower parts of the clamp fitting itself There is no need to worry about the jaw opening a little. In other words, since the hanging load acts on the upper jaw of the clamp fitting,
The clamping force is weakened and there is no risk of it falling off from the clamp part.

On the contrary, if the hanging load applied to the hanging lever becomes overload, the supporting shaft that supports the upper end of the lifting lever is composed of a so-called shearing supporting shaft, so it is cut and clamped. The pivot between the upper jaw of the metal fitting and the hanging lever is released. However, since the connection between the suspension lever and the rear end of the cam plate is never released, the suspension load tilts the cam plate through the suspension lever, and the effect of the cam plate is to strengthen the clamping force. demonstrate. In other words, even if the hanging load becomes overload, it can be used as an extremely safe clamp hanger.

(Example) Next, this clamp hanger will be described in more detail based on example diagrams. Figure 1 is a front view showing the clamp hanger according to the present invention clamped to the lower horizontal flange F of the steel section;
The figure is a side view of the clamp hanger of FIG. 1 seen from the left side.

First, in FIG. 1, reference numeral 1 denotes a clamp metal fitting constituting the clamp hanger main body, which has upper and lower jaws 1a and 1b, respectively, and its upper half is bifurcated as shown in FIG.

A cam plate 2 is pivotally supported on the forked upper jaw portion 1a of the clamp fitting 1, and the lower surface of the front end thereof is formed into an arcuate cam surface 2a.

Reference numeral 3 denotes a support shaft for pivotally supporting the front end of the cam plate 2, and the cam plate 2 is tiltable about this support shaft 3 as a fulcrum.

Reference numeral 4 denotes a tightening bolt screwed into the lower jaw portion 1b of the clamp fitting 1, which operates in a vertical direction corresponding to the cam surface 2a of the cam plate 2.

A pressure contact 6 having a built-in cushion material 5 made of rubber or the like is attached to the upper end of the tightening bolt 4.

7 is a hanging lever, 8 is this hanging lever 7
It is a ring of hanging chain connected to the lower end of. The upper end of the hanging lever 7 is configured in a forked shape as shown in FIG. Upper jaw part 1 of clamp fitting 1 with support shaft 9 of
It is pivoted on a.

Further, this support shaft 9 has thin grooves 9a and 9b carved in advance at the positions where the left and right outer sides of the hanging lever 7 shown in FIG. When a hanging load of a certain value or more is applied to this support shaft 9, it is sheared through the narrow grooves 9a, 9b and acts as a so-called shearing support shaft.
Incidentally, the shear load of the support shaft 9 in this example is 1000 kg. In other words, the hanging load is 1000Kg
Cut grooves 9a and 9b are cut so that the support shaft 9 is sheared through the thin cut grooves 9a and 9b. FIG. 3 shows this shearing support shaft.

Since the clamp hanger according to the embodiment is constructed as described above, first, when clamping the clamp hanger, as shown in FIG.
The cam plate 2 provided on the upper jaw portion 1a and the pressure contact 6 on the upper end of the tightening bolt 4 provided on the lower jaw portion 1b.
Clamp it between the two.
Therefore, in the clamp hanger according to the present invention, the hanging load applied via the hanging ring 8 is applied to the upper surface of the flange F via the cam plate 2 provided on the upper jaw portion 1a of the clamp fitting 1.

In other words, the fulcrum of the hanging load is applied to the flange F via the upper jaw portion 1a of the clamp fitting 1, so unlike the conventional method, the upper and lower jaws of the clamp fitting 1 open due to the hanging load, weakening the clamping force, and separating. There is no danger that it will. Furthermore, in the unlikely event that the hanging load increases and exceeds the allowable hanging load, for example 1000 in the example.
When the weight reaches Kg or more, the support shaft 9 connecting the upper end of the hanging lever 7 and the rear end portion 2b of the cam plate 2 is sheared. As a result, the connection between the clamp fitting 1 and the hanging lever 7 is released, but the shearing position of the support shaft 9 is a position 9a where the left and right outer sides of the hanging lever 7 and the left and right inner sides of the clamp fitting 1 touch, as shown in FIG. , 9b, the connection between the upper end of the hanging lever 7 and the rear end 2b of the cam plate 2 remains connected by the remaining support shaft 9 after being sheared, so it will not be released. . That is, the overload acts via the suspension lever 7 to tilt the cam plate 2 counterclockwise about the support shaft 3 shown in FIG. 4 as a fulcrum.
When the cam plate 2 tilts counterclockwise, the cam surface 2a formed on the lower surface of the cam plate 2 is pressed against the flange F surface, promoting an action of increasing the clamping force on the flange F. At the upper end of the tightening bolt 4,
Since the pressure contact 6, which is in pressure contact with the lower surface of the flange F, has a built-in cushion material 5, it absorbs a part of the increased clamping force, and even if vibration or impact is applied, it will not be affected. There is no possibility that the clamp hanger will be removed from the flange F section.

(Effects of the Invention) As explained above, the clamp hanger of the present invention completely eliminates the problem of conventional clamp hangers, such as separation from the clamp portion.

In particular, when the lifting load reaches the allowable load or the set load, the lifting lever is released from the clamp fitting and the cam plate is tilted to increase the clamping force.This functions as a kind of safety device and prevents the lifting. It is possible to prevent accidents caused by falling scaffolding, etc.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is a front view showing how the clamp hanger is used, Figure 2 is a side view of Figure 1 seen from the left, and Figure 3 functions as a shearing support shaft. Figure 4 shows the front view of the shearing spindle when the shearing spindle is sheared and the cam plate tilts.
FIG. 4 is a side view for explaining an operating state in which the clamping force is increased. 1...Clamp fitting, 1a...Point jaw, 1b...
... lower jaw, 2 ... cam plate, 9 ... spindle (shearing spindle), 2a ... cam surface, 2b ... rear end,
3... Support shaft, 4... Tightening bolt, 5... Cushion material, 6... Pressure contact, 7... Hanging lever, 8...
Chain ring, 9a, 9b...cut groove, F...flange.

Claims (1)

[Scope of utility model registration request] The front end of a cam plate whose lower front end surface is formed as a cam surface is pivoted to the upper jaw part of the clamp fitting having upper and lower jaw parts with a support shaft, and the lower jaw part is attached to the cam surface of the cam plate. Correspondingly, the upper end of the suspension lever, in which a tightening bolt that moves up and down in the vertical direction is screwed, and a suspension chain is connected to the lower end, and the rear end of the cam plate are connected to each other by a common shaft, and the upper jaw When the suspension load applied to the suspension lever reaches a certain level, this support shaft is cut off, and the suspension state between the upper jaw of the clamp fitting and the suspension lever is released, but the cam plate is A clamp hanger characterized in that the rear end and the upper end of the hanging lever are constructed as a shearing shaft that maintains a connected state.