JP3039068U - Connecting tools such as chains - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To open the open part of the connector without opening the open part of the connector without a tool that fits the set screw. A tubular opening / closing member (4) that opens and closes an opening (2) of a main body (1) and a set screw (5) that holds the tubular opening / closing member in a closed position.
Attach and detach freely. The set screw may be a screw with a square hole in which the screw base end surface 5b is retracted from the cylindrical opening / closing member surface in a tightened state.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is an openable / closable connector used for connecting chains and the like, and more specifically, a tubular opening / closing member screwed to an open end of the connector body is used to open / close the opening portion and bring the tubular opening / closing member to a closed position. The present invention relates to a connector such as a chain that can be held.

[0002]

[Prior art]

 As a connecting tool which is attached to a chain or the like and used to connect two chains or the like, a main body in which a wire having a predetermined length is bent in a U-shape at two places, and both ends of the wire are opposed to each other to form an opening, A threaded portion is provided at the open end of the main body, and a tubular opening / closing member that opens and closes the opening is screwed onto the threaded portion, and when the tubular opening / closing member is in the closed position, the tubular opening / closing member straddles the open portion. Therefore, a connector having a structure in which it is screwed into the threaded portions at both open ends of the main body to form a series of annular bodies has been put into practical use.

This kind of connecting tool is made to be substantially the same in shape as the chain ring that constitutes the chain. Therefore, when connecting two chains, even if there is a connecting tool in the middle of the chains. Handled without concern, the separation and connection of the two chains can be conveniently used by opening and closing the open part with a tubular opening / closing member at any time around the connection tool.

[0004]

[Problems to be solved by the device]

 However, by using the connecting tool having the above-mentioned configuration, for example, when two chains are connected and used, since the turning operation of the tubular opening / closing member can be easily performed by anyone, There was a problem that the cylindrical opening / closing member was pivotally moved by an unspecified third party to remove the chain.

Therefore, with the tubular opening / closing member in the closed position, a tubular pin having a vertical slit is fitted into a pin hole penetrating the tubular opening / closing member at a position corresponding to the open portion of the main body. A structure in which the tubular opening / closing member is held in the closed position has been proposed. However, in a connector using such a tubular pin, the tubular pin is totally reduced in diameter with respect to the pin hole and pressed against the wall surface of the pin hole due to its elasticity, so this is pulled out from the pin hole. Had a problem in that it required a special tool, and that the work was difficult and time-consuming.

Therefore, according to the present invention, the cylindrical opening / closing member can be securely held in the closed position by using the set screw, and the set screw can be attached / detached only by using a tool suitable for the set screw, and the open / closed state can be achieved. It is an object of the present invention to provide a connecting device such as a chain that restricts opening of parts.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the invention according to claim 1, the wire rod having a predetermined length is bent into a U-shape at two places, and the both ends of the wire rod are opposed to each other near one curved portion to open the wire rod. In a connector in which a tubular opening / closing member is screwed to open / close the opening portion to a main body having a portion and an open end of the main body, the tubular opening / closing member in the closed position projects into the opening portion. It is characterized in that a set screw that prevents the cylindrical opening / closing member from rotating in the opening direction is detachably attached.

Here, the basic form of the connector main body is substantially the same as the chain ring that constitutes the chain, and the tubular opening / closing member screwed to the screw part provided at the open end of the main body is It constitutes a kind of elongated nut provided with a female screw, and this tubular opening / closing member is screwed to the open end side of one body, and when it is rotated in the opening direction, When the open end of the main body on the screwing side is inserted into the tubular opening / closing member to open the opening, and when the tubular opening / closing member is rotated in the closing direction, the tubular opening / closing member straddles the opening. The threaded portion at the open end of the corresponding main body is screwed onto the tip end side in the loosened state to form a series of annular bodies. Also, the set screw for holding the tubular opening / closing member in the closed position is a female screw drilled on one side of the tubular opening / closing member corresponding to the open part of the main body when the tubular opening / closing member is in the closed position. The set screw used in the hole is a square hole screw that can be tightened and loosened with a hexagon wrench as described in claim 2, and the set screw is attached to the tubular opening / closing member. In this state, the tip of the screw can be pressed against the inner surface of the cylindrical opening / closing member, and the screw base end surface can be retracted from the surface of the cylindrical opening / closing member. In this way, by tightening the setscrew and strengthening the crimping of the tip of the screw to the inner surface of the tubular opening / closing member, the friction with the female screw hole is enhanced and the screw can be prevented from loosening. Also, in order to tighten and loosen the set screw whose base end face is retracted from the cylindrical opening / closing member face, it is necessary to prepare a hexagon wrench suitable for this, so opening / closing of the open part is restricted. In other words, the set screw cannot be removed with a hexagon wrench or other tool that does not fit the set screw, so the connector will not be accidentally removed.

Further, the mounting position of the set screw that projects into the open portion and blocks the rotational movement of the tubular opening / closing member in the opening direction is not necessarily the same as the final position when the tubular opening / closing member is pivotally moved in the closing direction. It is not necessary to position the set screw so as to engage with the open end of the main body at the stop position, and the cylindrical opening / closing member allows the opening direction or some rotation in the opening direction as claimed in claim 3. By doing so, since the tightening and loosening operation can be performed at a position where the set screw is separated from the open end of the main body, workability is improved.

[0010]

[Embodiment of the invention]

 Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional front view showing a part of the connecting tool with the opening / closing member in an open position, and FIG. 2 is a front view showing a part of the connecting tool with the opening / closing member in a closed position in cross section. Is.

In the figure, the main body 1 of the connector is formed by bending a wire rod having a predetermined length in a U-shape at two locations, and forming an open portion 2 with both ends of the wire rod facing each other near one curved portion. A screw portion 3 is provided at the open end of the main body 1 forming the open portion 2, and a tubular opening / closing member 4 for opening / closing the open portion 2 is screwed to the screw portion 3. The tubular opening / closing member 4 is always screwed into the threaded portion 3 on the longer side of the straight portion continuous with the curved portion, and when the tubular opening / closing member 4 is in the closed position, it is shown in FIG. As described above, the tubular opening / closing member 4 is threaded with the corresponding threaded portion 3 of the main body 1 on the tip end side thereof while straddling the main body opening portion 2 to form a series of annular bodies. A set screw 5 is detachably attached to the tubular opening / closing member 4 in order to hold the tubular opening / closing member 4 in the closed position. This set screw 5 is screwed into a female screw hole 6 formed on one side of the tubular opening / closing member 4, and when the set screw 5 is tightened, the screw tip 5a is attached to the corresponding tubular opening / closing member 4. The inner surface of the screw is crimped so that the screw base end surface 5b is retracted from the surface of the cylindrical opening / closing member 4. Here, as the set screw 5, a screw with a square hole that is attached and detached using a hexagon wrench is used.

Further, with the set screw 5 attached to the tubular opening / closing member 4, the tubular opening / closing member 5 is set to a position that allows some rotation in the closing direction or the opening direction.

In the above configuration, when inserting or removing the ring body A of the chain to be connected to the main body 1 as the connecting tool, the set screw 5 is removed from the tubular opening / closing member 4 to remove the tubular opening / closing member 4. The opening portion 2 is opened by rotating the opening portion 2 in the opening direction. When the tubular opening / closing member 5 is held at the closed position, the tubular opening / closing member 4 is pivotally moved to the closing position to close the opening 2, and the hexagon wrench B is inserted into the female screw hole 6 of the tubular opening / closing member 4. Use to tighten set screw 5. In this way, the screw tip 5a of the set screw 5 is pressed against the inner surface of the tubular opening / closing member to increase friction with the female screw hole 6 and prevent loosening. Further, the screw base end surface 5b is retracted from the surface of the tubular opening / closing member 4, and the tightening / loosening operation cannot be performed without the hexagon wrench B matching this, so that the opening / closing of the opening 2 is restricted.

[0015]

[Effect of the invention]

 According to the present invention, the tubular opening / closing member that opens and closes the opening of the connector body holds the set screw and holds it in the closed position. The set screw cannot be attached or removed without a matching hex wrench, so the opening and closing of the open part is restricted, and an unspecified third party inadvertently opens the connecting tool to remove the chain etc. connected with this. It disappears. Also, the user can easily attach and detach the set screw by using a hexagon wrench that fits the set screw, thus making the connector easy to use.

[Brief description of the drawings]

FIG. 1 is a front view showing a cross section of a part of a connecting tool with a tubular opening / closing member in an open position.

FIG. 2 is a front view showing a cross section of a part of the connecting tool with the tubular opening / closing member in the closed position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Open part 3 ... Screw part 4 ... Cylindrical opening / closing member 5 ... Set screw 5a ... Screw tip 5b ... Screw base end surface 6 ... Female screw hole A ... Chain ring B ... Hex wrench

Claims (3)

[Utility model registration claims] 1. A body in which a wire having a predetermined length is bent into a U-shape at two places, and the wire is provided at the open end of the main body with the open end formed by facing both ends of the wire toward one curved portion. In a connector in which a tubular opening / closing member for opening / closing the opening is screwed to a threaded portion, the tubular opening / closing member in the closed position projects into the opening to prevent the tubular opening / closing member from rotating in the opening direction. A connecting tool for chains, etc., characterized in that a set screw is detachably attached. 2. A set screw is a screw with a square hole that can be loosened and tightened by a hexagon wrench, and the set screw is attached to the tubular opening / closing member, and the screw tip is crimped to the inner surface of the tubular opening / closing member. The connector for a chain or the like according to claim 1, wherein the screw base end face is retracted from the cylindrical opening / closing member face. 3. The tubular opening / closing member is allowed to rotate in the opening direction or to some extent in the opening direction in a state where a set screw is attached to the tubular opening / closing member. Connecting tool for chains, etc.