JP2006138173A - Chain lock device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chain lock device capable of improving operational reliability so that the release of the interlock of a chain-like restraint body does not indiscriminately occur even if loading of percussion, etc. is carried out. <P>SOLUTION: The chain lock device is constituted by having a chain insertion hole 3 inserting a lock insertion section 2 formed in the front end of the chain-like restraint body 1 and a lock piece 6 capable of being rotated between an interlock rotational position interlocking an interlock section 5 with an engaging recess section 4 formed in the lock insertion section 2 inserted into the chain insertion hole 3 and an interlock release rotational position sheltering the interlock section 5 from the chain insertion hole 3 by rotating in the direction of insertion of the lock insertion section 2 and energized to the interlock rotational position side, and it is so constituted that the center of rotation of the lock piece 6 approximately coincides with the position of the center of gravity. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chain locking device.

  As a chain locking device for fixing the end of the chain-like restraining body and maintaining the loop shape of the chain, the one described in Patent Document 1 is known. In this conventional example, the other end of the chain-like restraining body having a locking groove at one end is connected to the chain locking device in a non-detachable manner. The chain locking device is provided with a movement locking portion, and the loop shape of the chain-like restraining body is maintained by locking this movement locking portion in the locking groove at one end of the chain-like restraining body. The movement locking portion is biased in the locking direction with the locking groove by a biasing spring, and the movement locking portion is elastically locked into the locking groove only by inserting one end of the chain-like restraining body.

Unlocking of the locking groove and the movement locking portion is performed by rotating a cylinder lock provided in the chain locking device in the unlocking direction, and the movement locking portion is unlocked by the unlocking operation to the cylinder lock. It moves to the unlocking position against the biasing force of the biasing spring. When the cylinder lock is in the locked state, the movement of the movement locking portion is not restricted by the cylinder lock. Therefore, if the cylinder lock is set in the locked state in advance, the chain-like restraint body is operated without operating the unlock key. The locking operation can be completed simply by inserting one end of the shaft into the chain locking device.
Japanese Patent Laid-Open No. 7-180418

  However, the above-described conventional example has a problem that the locking operation is not reliable because the locking state between the movable locking portion and the locking groove in the locked state is held only by the biasing force of the biasing spring. is there. That is, if an impact is applied to the chain locking device in the locked state, the movement locking portion may move to the locking release position with the locking groove due to inertia, and the movement locking portion may move to the locking release position. If the chain-like restraint is pulled in the removal direction when the movement occurs, the loop shape may be released even when the chain locking device is locked.

  The present invention has been made to eliminate the above drawbacks, and improves operation reliability by preventing the chain-like restraint from being unlocked even when an impact is applied. An object is to provide a chain locking device.

According to the present invention, the object is
A chain insertion hole 3 for inserting a lock insertion portion 2 formed at the tip of the chain-like restraining body 1;
The locking portion 5 is rotated by the locking rotation position where the locking portion 5 is locked to the locking recess 4 formed in the lock insertion portion 2 inserted into the chain insertion hole 3 and in the insertion direction of the lock insertion portion 2. A lock piece 6 that is rotatable between the lock release rotation position retracted from the chain insertion hole 3 and biased toward the lock rotation position side;
This is achieved by providing a chain locking device in which the center of rotation of the lock piece 6 substantially coincides with the position of the center of gravity.

  The chain-like restraining body 1 is formed to be bendable by, for example, connecting a chain body or a housing to each other so as to be rotatable, and a lock insertion portion 2 is provided at the tip thereof. The lock insertion portion 2 is provided with a locking recess 4. When the lock insertion portion 2 is inserted into the chain insertion hole 3, the lock piece 6 is once rotated to the locking release rotation position side and the lock insertion portion 2 is chained. After being received in the insertion hole 3, the locking recess 4 returns to the locking rotation position side again by the urging force at the corresponding position, and the locking portion 5 is locked to the locking recess 4. The locking release rotation position direction of the lock piece 6 coincides with the chain insertion direction, and the locking rotation position cannot be rotated in the removal direction of the chain-like restraint body 1. The locked state is not released by the removal of the chain-like restraining body 1, and the connected state of both is maintained.

  On the other hand, since the lock piece 6 is only held at the locking rotation position by the urging force, when an inertial force is generated due to an impact, a rotation torque is generated around the pivot 6a to rotate to the locking release rotation position. there is a possibility. On the other hand, in the present invention in which the center of rotation of the lock piece 6 is substantially coincident with the position of the center of gravity of the lock piece 6, there is no or little generation of rotational torque due to inertial force. The unlocking operation does not occur and the locking reliability is improved.

  Further, if the chain insertion hole 3 is arranged on the side of the plug 7 for unlocking the lock piece 6, the dimension corresponding to the longitudinal direction of the plug 7 can be shortened, and the handling of the apparatus is improved.

  According to the present invention, even when an impact or the like is applied, the chain-like restraint is not unlocked unnaturally, so that the operation reliability can be improved.

  1 to 3 show an embodiment of the present invention. First, the chain-like restraint 1 is configured by forming a lock insertion portion 2 at the tip of a general portion 1a that is formed to be bendable with a material having sufficient resistance to cutting and breaking. The lock insertion portion 2 is formed with a locking recess 4 over the entire circumference by recessing the outer periphery into a groove shape.

  The locking device that locks the locking recess 4 and connects the chain lock restraint body is formed by holding a rotatable plug 7 in a housing covered with an outer shell member 9. The plug 7 can be rotated only by a genuine unlocking key (not shown) inserted from the key insertion hole 7a. The plug 7 is rotated clockwise and counterclockwise 90 with respect to the locking rotation position shown in FIG. ° The unlocked rotation position is set at the rotated position. As shown in FIG. 2, a cam projection 7 b that is eccentric with respect to the rotation center (C) of the plug 7 is provided at the end of the plug 7, and a driving member 8 described later is connected thereto.

  A chain insertion hole 3 is opened in the housing. As shown in FIG. 2, the chain insertion hole 3 is disposed on the side of the plug 7 in order to shorten the length of the plug 7 in the longitudinal direction (depth direction). As shown in FIGS. 2 and 3, two chain insertion holes 3 are arranged on two parallel chain insertion lines (Lc) arranged in line-symmetrical positions with the plug 7 interposed therebetween. As shown in a), each opens to the side wall of the housing.

  As shown in FIG. 3A, a lock piece 6 is disposed in the vicinity of each chain insertion hole 3. The lock piece 6 is in a twisted position with respect to the central axis (C) of the plug 7 and the chain insertion line (Lc), and is rotatable about a pivot axis 6a that intersects these three-dimensionally at an intersection angle of 90 °. Pivoted. Each lock piece 6 has a center-of-gravity position and a rotation center that coincide with each other in order to minimize the moment around the pivot 6a generated by the inertial force at the time of applying an impact. In this embodiment, the lock piece 6 is formed in a cross-sectional shape that is point-symmetric with respect to the center of rotation.

  The lock piece 6 has an oval shape in which the short side portion substantially coincides with the curvature of the locking concave portion 4 of the lock insertion portion 2, and one short side portion (the locking portion 5) is illustrated depending on the rotation posture. As shown in FIG. 4 (a), it is pivotally supported at a position where it can enter the chain insertion hole 3 or retract from the chain insertion hole 3 as shown on the right side of FIG. 5 (b). In order to prevent the locking portion 5 from overrunning and retreating from the chain insertion hole 3 after moving to the rotation position (locking rotation position) for entering the chain insertion hole 3, the housing includes a lock piece. 6 is provided with a stopper wall 10 that comes into contact with the stopper projection 6b only during overrun. As a result, a buffer region (d) is provided between the stopper projection 6b and the stopper wall 10 during locking. When a force due to impact is applied to the stopper wall 10, the force is not directly transmitted to the stopper projection 6 b by the buffer region (d), and the lock piece 6 is prevented from rotating to the unlocking rotation position. As described above, the lock piece 6 is formed in a point-symmetric shape with respect to the rotation center, and the other short side portion facing the locking portion 5 that corresponds to the stopper projection 6b is used as the operation projection 6c. The

  On the other hand, as shown in FIG. 5 (b), the end of the stroke on the lock release rotation position side of the lock piece 6 in which the lock portion 5 is retracted from the chain insertion hole 3 is the side of the lock portion 5 is contacted. It is determined by the release side stroke regulating wall 11 of the housing in contact.

  Further, the lock piece 6 is biased toward the locking rotation position by the biasing means 12. As shown in FIG. 3 (b), the urging means 12 in this embodiment includes a leaf spring that sandwiches a small judgment surface portion 6d formed on the shaft portion of the lock piece 6 and a flat surface portion 6e of the small judgment surface portion 6d. 12a. The boundary between the flat surface portion 6e of the small judgment surface portion 6d and the curvature portion 6f is such that the lock piece 6 reaches the unlocking rotation position so that the biasing force is generated even when the lock piece 6 rotates to the locking release rotation position. Even if it rotates, it sets so that it may contact | abut to the leaf | plate spring 12a.

  As shown in FIG. 3 (a), the lock piece 6 on the same chain insertion line (Lc) has a left-right arbitrary shape based on the posture of the small judgment surface portion 6d, and the stopper projection 6b is a chain insertion hole. 3 are arranged so that the operation projections 6c face each other.

  Therefore, in this embodiment, as shown in FIG. 3, when the lock insertion portion 2 of the chain-like restraining body 1 is not inserted into the chain insertion hole 3, the lock piece 6 is locked by the urging means 12 to the locked rotation position. Retained. When the lock insertion portion 2 of the chain lock restraint is inserted into the chain insertion hole 3 with the plug 7 in the locking rotation position, the lock piece 6 is positioned at the tip of the lock insertion portion 2 as shown on the right side in FIG. And the lock insertion portion 2 is received in the chain insertion hole 3.

  In this state, as shown on the right side of FIG. 4 (b), the lock piece 6 is urged toward the locking rotation position by the urging means 12, and the lock insertion portion 2 is further inserted to lock the locking portion 5. When the locking recess 4 coincides with this rotation locus, as shown on the left side of FIG. 4A, the lock piece 6 returns to the locking rotation position by the urging force, and both shift to the locking state. Since the lock piece 6 is overrun from the locking rotation position by the stopper wall 10, the lock insertion portion 2 can be pulled out even when a load in the removal direction is applied to the lock insertion portion 2 in the locked state. No, the connected state is maintained.

  The locked state is released by operating the plug 7 to drive the drive member 8. As shown in FIG. 2 (b), the drive member 8 is a plate body that is movable along the chain insertion line (Lc) in a plane orthogonal to the center line (C) of the plug 7, and has a central portion. A cam projection 7b that rotates integrally with the plug 7 is inserted into the long hole 8b that is opened. The cam projection 7b is set so that the center of the rotation stroke when the plug 7 is rotated to both unlocking rotation positions coincides with the position of the plug 7 at the locking rotation position.

  In addition, operation sides 8 c are set at both end edges on the moving side of the drive member 8. As shown in FIG. 3A, the operation side faces both the operation protrusions 6c and 6c facing each other when the plug 7 is in the locking rotation position. From this state, as shown in FIG. 5, when the plug 7 is rotated to one of the unlocking rotation positions, as shown on the right side in FIG. The operation projections 6c of the two lock pieces 6 corresponding to the side 8c are pressed. As a result, the lock pieces 6 and 6 are driven to rotate toward the unlocking rotation position, and the chain-like restraining body 1 on the side restrained by the lock piece 6 can be removed.

It is a figure which shows this invention, (a) is a figure which shows the lock | rock insertion part of a chain-like restraint body, (b) is a top view which shows the state which connected the chain-like restraint body to the locking device, (b) is a front view. is there. It is a figure which shows a locking device, (a) is the 2B-2B sectional view taken on the line of FIG.1 (b), (b) is the 2B direction arrow line view of FIG.2 (a) which removed the outer shell member. It is a figure which shows the lock insertion part uninserted state, (a) is the sectional view on the 3A-3A line of FIG.2 (b), (b) is the sectional view on the 3B-3B line of FIG.2 (b). It is sectional drawing which shows the insertion state of a lock | rock insertion part, (a) is a figure corresponding to Fig.3 (a), (b) is a figure corresponding to FIG.3 (b). It is a figure which shows latching releasing operation | movement, (a) is a figure corresponding to FIG.2 (b), (b) is a figure corresponding to Fig.3 (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chain-like restraint body 2 Lock insertion part 3 Chain insertion hole 4 Locking recessed part 5 Locking part 6 Lock piece 7 Plug 8 Drive member

Claims (4)

A chain insertion hole for inserting a lock insertion portion formed at the tip of the chain-like restraint;
The locking portion is retracted from the chain insertion hole by rotating in the locking rotation position where the locking portion is locked to the locking recess formed in the lock insertion portion inserted into the chain insertion hole and in the insertion direction of the lock insertion portion. A lock piece that is rotatable between the lock release rotation position and biased to the lock rotation position side;
A chain locking device in which the rotation center of the lock piece substantially coincides with the position of the center of gravity. A plug that can be operated from the locking rotation position to the unlocking rotation position with a genuine unlocking key,
A drive member for operating the lock piece to the unlocking rotation position side by the operation to the unlocking rotation position side of the plug,
2. The chain locking device according to claim 1, wherein the chain insertion hole is disposed on a side of the plug so as to cross three-dimensionally with respect to the plug at a crossing angle of 90 °. Two of the chain insertion holes are arranged in a straight line in the back position, and the plug has an unlocking rotation position at two positions opposite to the locking rotation position,
The chain locking device according to claim 2, wherein the drive member drives any one lock piece corresponding to the locking rotation direction of the plug to the locking release rotation position. The chain locking device according to claim 3, wherein the pair of chain insertion holes is provided in two rows at symmetrical positions across the center of the plug.

Images