JPH10219994A - Chain joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain joint that retains the connection of chains reliably in a relaxed state and facilitates connection work significantly. SOLUTION: In a chain joint, the first chain C1 is jointed to one end thereof and a chain hooking housing 3 that has a notch through which one chain piece of the second chain can be run and to which one chain piece and an adjoining chain piece are inserted and fastened in a detachable manner are formed on the other end. In such a case, an engagement member that protrudes into the chain hooking housing 3 and engages with a chain piece and a chain locking mechanism that prevents a chain from being released and has a coil spring 16 that urges the engagement member toward the direction that protrudes into the chain hooking housing 3, are arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a chain, and mainly relates to construction work for bridges and buildings.
Also, the present invention relates to a chain joint used for connecting a suspension chain for suspending a scaffold in high-altitude work such as construction of a large ship.

[0002]

2. Description of the Related Art As is well known, a flat plate is suspended by a plurality of chains as a work suspending scaffold temporarily installed at a high place, such as a construction site such as a bridge or a building, or a construction site of a large ship. Things are mainly used. In this case, the suspension chain is usually provided separately so that the height of the flat plate serving as a scaffold can be adjusted, and a chain joint that can be locked at an arbitrary chain piece portion is connected to the connection. It is used. FIG. 7 is an external perspective view showing a use state of the conventionally used chain joint, FIG. 8A is a plan view, and FIG. 8B is a sectional view taken along line GG in FIG. 8A. . Chain joint 51
Has a chain C5 attached to one end via a support shaft 52, and a chain C6 to be connected to the other end.
A chain lock housing 53 for locking the lock is formed. A notch 54 is provided in the chain locking housing 53 so that a chain piece c7, which is one of the chain pieces of the chain C6, can pass vertically, and a chain piece c8 orthogonal to the chain piece c7 is chain locked. The chain C6 is locked to the chain joint 51 by being inserted into the housing 53.

[0003]

When a chain for suspension, in this case, the chains C5 and C6 are used as a suspension scaffold at a work site, the chain is naturally stretched in the vertical direction. It will be stretched while being tensioned by weight or the like. For this reason, the conventional chain joint has a structure in which the suspension chain is always locked only in a tensioned state, and the depth L5 at which the chain piece is inserted and stored in the chain locking housing is also set. It is formed extremely shallow.
Therefore, for example, when the suspension chain is removed from the hooking part to change the temporary position of the suspension scaffold, or
When tension is no longer applied to the suspension chain, such as when the flat plate is pushed up by a gust from below, there is a risk that the chain piece will easily fall out of the chain locking housing, Improvements in safety have been desired. In addition, at work sites, workers often wear gloves, gloves, etc., and when locking the chain to the chain joint, the chain piece cannot be properly introduced into the notch of the chain locking housing. The connection work itself has been desired to be improved.

The present invention has been made in order to solve such a problem, and reliably maintains the connection of the chain even when the tension is not applied to the chain, and the connection work becomes extremely easy. It aims to provide a chain joint.

[0005]

The present invention uses the following means to achieve the above object. First, as a first means, a first chain is attached to one end side, and a notch is provided at an upper end thereof through which one chain piece of the second chain can pass. In a chain joint having a chain locking housing for detachably inserting and locking adjacent chain pieces, the chain joint includes an engaging member projecting into the chain locking housing and engaging with the chain piece. A chain lock mechanism is provided to prevent the occurrence. As a second means, the chain lock mechanism is configured to have an elastic member that urges the engaging member in a direction in which the engaging member always projects into the chain locking housing. Further, as a third means, an inclined portion for easily guiding the chain piece to the notch is formed above the opening surface of the chain locking housing. Further, as a fourth means, the chain locking housing is formed so as to have a dimension capable of accommodating at least the linear portion of one chain piece inserted and locked.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a chain joint according to the present invention, in which FIG. 1A is a plan view, FIG. 1B is a side view, and FIG. 2A is a cross-sectional view taken along the line AA in FIG. ,
2B is a cross-sectional view taken along line BB in FIG. 1B, FIG. 3 is an overall perspective view, and FIG. 4 is an operation explanatory view of the chain joint.

In FIGS. 1 to 3, reference numeral 1 denotes a chain joint, which is made of stainless steel, casting, synthetic resin, or the like. As shown in FIG. 3, a chain C1 is attached as a first chain. On the other end side of the substrate portion 2, there is a cutout at an upper portion through which one chain piece of the second chain can pass, and the one chain piece and the adjacent chain piece are detachably inserted and locked. A chain locking housing 3 is formed. The chain locking housing 3 specifically has the following shape. Side walls 5a and 5b which rise vertically from both sides of the substrate portion 2 are formed, and a back wall 6 and an upper wall 7 are formed to appropriately accommodate a substantially elliptical chain piece in its longitudinal direction. It is formed to have a stop space portion 8. The upper wall 7 of the chain locking housing 3 is provided with a notch 4 for allowing the chain piece to pass vertically, and the notch 4 is cut out to the intersection of the back wall 6 and the substrate 2. . Therefore, when one chain piece is passed through the notch 4, the chain piece orthogonal to and adjacent to the chain piece is inserted from the opening surface 9 into the chain locking space 8. Become. Note that a groove 10 is formed in the substrate portion 2 to allow a chain piece passing through the notch 4 to escape.

The chain joint 1 has an engaging member projecting into the chain engaging housing and engaging with the chain piece. In this embodiment, the engaging member is always projected into the chain engaging housing. And a chain lock mechanism for preventing the chain from coming off is provided by providing an elastic member for urging in the direction.
The bottom projection 11 is formed at the lower part of the base member, and the engaging member and the elastic member are disposed at this portion. A groove 12 is formed in the bottom protrusion 11, and a rod-shaped engaging member 13 rotatably supported by a support shaft 14 attached to the bottom protrusion 11 is located inside the groove 12. One end of the engaging member 13 is disposed in the chain locking housing 3, that is, in the space of the groove 10, at a slant so as to allow the chain piece to pass therethrough.
The other end side is bent at an acute angle, and the bent portion 13 a is positioned so as to reciprocate through a hole 15 formed in the substrate portion 2. And the bent part 13
a, one end of the engaging member 13 is connected to the chain locking housing 3.
A coil spring 16 for urging in a direction in which the coil spring always projects inside is attached.

In order to prevent the chain piece from being easily pulled out when the chain piece is inserted and locked inside the chain locking housing 3, the chain locking housing 3 is provided.
That is, the depth L1 of the chain locking space 8 is formed so that at least the linear portion of the chain piece can be accommodated. If the depth dimension L1 is increased in this way, the frictional force between the chain piece and the inner wall portion is increased, so that there is an advantage that the chain is less likely to come off as compared with the conventional chain joint.

Further, on the upper part of the opening surface 9 of the chain locking housing 3, that is, on the upper wall 7, an inclined portion 17 for easily guiding the chain piece to the notch 4 is formed so as to draw a gentle arc. This makes it easy to connect chains at busy work sites. Note that the inclined portion 17 may be formed in a linear shape instead of an arc shape.

Next, the operation of the chain joint 1 configured as described above will be described with reference to FIG.
First, the chain piece c2 of the chain C2 to be connected is made vertical and is passed from the opening surface 9 to the notch 4 (FIG. 4A). When the chain piece c2 is further passed along the notch 4, the lower end of the chain piece c2 is
0, which comes into contact with the tip of the engaging member 13 projecting into the space,
The projecting portion of the support shaft 14 is pushed down toward the groove 12 against the urging force of the coil spring 16 (FIG. 4).
(B)). And if you pull the chain C2 further,
The chain piece c1 is completely inserted into the chain locking space 8, and the tip of the engaging member 13 projects again into the space of the groove 10 by the urging force of the coil spring 16 (FIG. 4).
(C)). Therefore, even if the chain C2 is slackened as shown in FIG. 4D, that is, the chain is not tensioned, the chain piece c2 is not
3 to prevent the chain C2 from coming off and securely hold the connection between the chains C1 and C2.

FIG. 5 is an explanatory view showing another embodiment of the chain lock mechanism. In this example, as the engaging member 20, the protruding portion 21 having the inclined surface, the shaft portion 22, the support portion 23
A coil spring 24 having an urging force for constantly projecting the projecting portion 21 into the chain locking housing is attached to the shaft portion 22. Even if the chain lock mechanism is configured in this way, the same effect as the above-described chain lock mechanism can be obtained.

Next, a further embodiment of the chain lock mechanism is shown in FIG. Also in this example, the engagement member 25 is configured to include the protruding portion 26, the shaft portion 27, and the support portion 28. However, the difference from the above-described two lock mechanisms is that the engagement member is always engaged with the chain. The point that the coil spring 29 is disposed so as to urge the chain toward the outside of the housing. In this case, when the chain has been inserted and locked in the chain locking housing, the support portion 28 is pushed with a finger. For example,
If the rotatable lever 30 provided on the bottom protrusion is rotated to press the head of the support portion 28 (the state of FIG. 6B),
The projection 26 engages with the chain piece to securely lock the chain.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the chain joint having the shape shown in the drawings, and the lock mechanism of the chain is particularly applicable to the components of the chain. The present invention is not limited to the examples described above, such as the shape and the mounting position, and various application designs are possible without departing from the gist of the present invention.

[0015]

According to the chain joint of the present invention, the following effects can be obtained. (1) By providing a chain lock mechanism having an engaging member that protrudes into the chain locking housing and engages with the chain piece, the chain piece protrudes from the engaging member even when the chain is not tensioned. And secures the connection of the chain, thereby improving work safety on site. (2) The number of members of the chain lock mechanism itself is reduced by configuring the chain lock mechanism to have an elastic member that biases the engagement member in a direction in which the engagement member always projects into the chain locking housing. Is possible, and a reduction in manufacturing cost can be realized. (3) By forming an inclined portion at the upper portion of the opening surface of the chain locking housing to easily guide the chain piece into the notch, the connection work of the chain at a busy work site becomes easy. (4) The frictional force between the chain piece and the inner wall portion can be increased by forming the chain locking housing to have a dimension capable of accommodating at least the linear portion of one chain piece that is inserted and locked. In addition, the chain can be prevented from coming off more easily than the conventional chain joint.

[Brief description of the drawings]

1 is an external view of a chain joint according to the present invention, FIG. 1 (a) is a plan view, and FIG. 1 (b) is a side view.

2A is a cross-sectional view taken along a line AA in FIG. 1A, and FIG. 2B is a cross-sectional view taken along a line BB in FIG. 1B.

FIG. 3 is an overall perspective view of a chain joint.

FIG. 4 is an explanatory diagram of an operation of a chain joint.

FIG. 5 is an explanatory view showing another embodiment of the chain lock mechanism.

FIG. 6 is an explanatory view showing another embodiment of the chain lock mechanism.

FIG. 7 is an external perspective view showing a use state of a conventional chain joint.

8A and 8B are explanatory views of a conventional chain joint. FIG. 8A is a plan view, and FIG.
It is -G sectional drawing.

[Explanation of symbols]

 C1, C2 Chain c1, c2 Chain piece 1 Chain joint 2 Board part 3 Chain locking housing 4 Notch 5a, 5b Side wall 6 Back wall 7 Top wall 8 Chain locking space 9 Opening surface 10 Groove 11 Bottom protrusion 12 Groove DESCRIPTION OF SYMBOLS 13 Engagement member 14 Support shaft 15 hole 16 Coil spring 17 Inclined part 18 Chain attachment hole 19 Long hole 20 Engagement member 21 Projection part 22 Shaft part 23 Support part 24 Coil spring 25 Engagement member 26 Projection part 27 Shaft part 28 Support part 29 Coil spring 30 lever

Claims (4)

[Claims] 1. A first chain is attached to one end, and a notch is provided at an upper end of the first chain so that one chain piece of the second chain can pass therethrough, and is adjacent to the one chain piece. A chain joint in which a chain locking housing for detachably inserting and locking a chain piece is formed, the chain joint having an engaging member projecting into the chain locking housing and engaging with the chain piece to prevent detachment of the chain. A chain joint having a chain lock mechanism. 2. The chain according to claim 1, wherein the chain lock mechanism has an elastic member that urges the engagement member in a direction in which the engagement member always projects into the chain locking housing. Joint. 3. An inclined portion for easily guiding a chain piece to the notch is formed at an upper portion of an opening surface of the chain locking housing. Chain joint. 4. The chain locking housing is formed to have a dimension capable of accommodating at least a linear portion of one chain piece inserted and locked.
The chain joint according to any of the above.