Joint lock release mechanism

Abstract

To provide an unlocking structure of a joint lock which can secure the aesthetic appearance of a door for inspection of a facility or the like, which does not require time and labor for opening the door, whose number of parts can be reduced, and which can be provided at low cost.SOLUTION: An engagement groove 8 is formed in the surface of a door 1 facing a joint 3 in the depth direction, and a key 10 is provided with a branch rod 13 branched in the midway in the axial direction of a key shaft 12. When the tip of the key shaft 12 is inserted into a keyhole 5 at the back of the joint 3 and rotated, a latch 6 of a lock body 4 attached to a door frame 2 retracts and separates from a latch receiving section 7 of the door 1, and the branch rod 13 engages with the engagement groove 8 and when the key 10 is pulled toward the front in such a state, the door 1 is pulled toward the front together with the key 10, and before the key shaft 12 is removed from the keyhole 5, the back side of the door 1 from the latch receiving section 7 reaches the position of the tip of the latch 6 and after the key shaft 12 is removed from the keyhole 5, the latch 6 protrudes to open the door 1.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a structure for unlocking a joint lock having a keyhole at the back of the joint of a door for equipment inspection, etc., and opening the door. [Background technology]

[0002] For example, as shown in Figure 9, in office buildings, condominiums and other buildings that value a sense of luxury, it is preferred to have doors 1 facing the interior corridors and used for inspecting various pieces of equipment such as air conditioning equipment, water and gas meters, and distribution boards, fitted like a wall so that metal fittings such as locks are not exposed. In response to such demands, Patent Document 1 below proposes a joint lock in which the keyhole of the lock body attached to the door frame 2 is located at the back of the joint 3 in the gap between the outward-opening door 1 and the door frame 2.

[0003] When this joint lock is operated by inserting the key shaft into the keyhole at the back of the joint and turning it, the latch on the lock body is pulled in and at the same time a kick rod protrudes from the lock body to kick the door out. The door is then left half-open and the door can be fully opened by placing a hand on the edge of the door. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-9503 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the above-mentioned joint lock, when opening the door for equipment inspection, it is necessary to turn the key and place a hand on the door edge to open the door, which can be somewhat inconvenient.

[0006] In addition, the mechanism for linking the extension and retraction of the latch and the extension and retraction of the kick rod is complex and requires a large number of parts, which increases costs.

[0007] Therefore, the object of the present invention is to provide a joint lock unlocking structure that can ensure the aesthetic appearance of a door for equipment inspection, etc., does not require any effort when opening the door, reduces the number of parts, and can be provided at low cost. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a joint lock unlocking structure in which a keyhole of a lock body attached to a structure is provided at the back of a joint between an outward-opening door and the adjacent structure, and the door is unlocked by inserting a key shaft of a key into the keyhole to open the door, The door has an engagement groove formed on a surface facing the joint in the projection direction, The key is provided with a branch rod that branches off midway along the axial direction of the key shaft, When the tip of the key shaft of the key is inserted into the keyhole and rotated, the latch of the lock body retreats and disengages from the latch receiving portion of the door, and the branch rod engages with the engagement groove, In this state, when the key is pulled toward the user, the door is pulled toward the user together with the key, and the door is opened.

[0009] Before the key shaft is removed from the keyhole, the rear side of the latch receiving portion of the door reaches a position facing the tip of the latch, After the key shaft is removed from the keyhole, the latch projects.

[0010] In addition, when the tip of the key shaft is inserted into the keyhole, the key shaft is positioned in the forward direction, and accordingly, the key shaft rotates with the branch rod positioned relative to the engagement groove of the door. Effect of the Invention

[0011] In the joint lock unlocking structure of this invention, the keyhole of the lock body is located at the back of the joint, which has the advantage of ensuring the aesthetic appearance of the door for equipment inspection, etc., and when inspecting equipment, the door can be opened simply by inserting the key shaft into the keyhole and rotating it, and pulling the key towards you, so there is no hassle and there is no need for a complex locking mechanism consisting of many parts, so the unlocking function can be provided at low cost. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional plan view showing a locked state of a joint lock according to an embodiment of the present invention. [Diagram 2] Front view of the joint with the keyhole visible [Diagram 3] FIG. [Figure 4] A front view of the joint showing how to use the key [Diagram 5] FIG. 1 is a cross-sectional plan view showing the state in which the key shaft is inserted into the keyhole of the same embodiment. [Figure 6] FIG. 11 is a cross-sectional plan view showing the initial state of unlocking after the key shaft is rotated. [Figure 7] A cross-sectional plan view showing the unlocking process of the above key and door being pulled forward. [Figure 8] FIG. 3 is a cross-sectional plan view showing the unlocked and open state of the above door. [Figure 9] A perspective view showing the layout of doors for equipment inspection in the building's internal corridors. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0014] As shown in Figures 1 and 2, this joint lock has a keyhole 5 of a lock body 4 attached to a door frame 2 located at the back of a joint 3 in the gap between an outward-opening door 1 for equipment inspection, etc., and the adjacent door frame 2.

[0015] The keyhole 5 communicates with the joint 3 through a hole in the door-stop surface of the door frame 2, and the latch 6 of the lock body 4 advances and retreats relative to a hole that is a latch receiving portion 7 provided in the strike of the door 1.

[0016] An engagement groove 8 is formed on the door 1 on the surface facing the joint 3. The engagement groove 8 is a vertically long hole.

[0017] On the other hand, as shown in Figure 3, the key 10 used to unlock this joint lock has a key shaft 12 extending from a handle portion 11 via a rod-shaped shaft portion, and a branch rod 13 is provided midway in the axial direction of the key shaft 12. The key shaft 12 is shaped like a square bar to fit the keyhole 5.

[0018] To use such a key 10 to unlock and open the door 1, the branch 13 of the key 10 is oriented vertically so that it matches the extension direction of the joint 3, and the tip of the key shaft 12 is inserted into the keyhole 5, as shown in Figures 4 and 5.

[0019] At this time, the key shaft 12 hits the bottom of the keyhole 5 and is positioned in the forward direction, and the branch rod 13 is positioned relative to the engagement groove 8 of the door 1.

[0020] Next, grasp the handle portion 11 of the key 10 and rotate the key shaft 12 a specified angle (for example, 60°) toward the door 1. The latch 6 will then move back and disengage from the latch receiving portion 7 of the door 1, and the branch rod 13 will engage with the engagement groove 8 (Figure 6 shows the state after the key shaft 12 has been rotated 90°).

[0021] 7, when the key 10 is pulled toward the door 1 together with the key 10, the flat portion of the door 1 on the rear side of the latch receiving portion 7 reaches a position facing the tip of the latch 6 before the key shaft 12 is removed from the keyhole 5. In this state, the latch 6 does not re-fit into the latch receiving portion 7 and is held in the retracted position.

[0022] When the key 10 is further pulled toward the user, as shown in FIG. 8, the key shaft 12 comes out of the keyhole 5, the latch 6 protrudes, and the door is completely unlocked, and the door 1 is opened.

[0023] In the joint lock unlocking structure described above, the keyhole 5 is located at the back of the joint 3, which has the advantage of ensuring the aesthetic appearance of the door 1 for equipment inspection, etc. In addition, when inspecting equipment, the door 1 can be opened simply by inserting the key shaft 12 into the keyhole 5 and rotating it, and pulling the key 10 toward you, which is hassle-free and does not require a complex locking mechanism consisting of many parts, so the unlocking function can be provided at low cost.

[0024] In the above embodiment, the structure adjacent to the door 1 is the door frame 2, but even if the doors 1 are adjacent to each other via a joint 3, an unlocking structure with the same function as the above embodiment can be achieved by attaching the lock body 4 to one door 1 and providing a latch receiving portion 7 and an engagement groove 8 on the other door 1. [Explanation of symbols]

[0025] 1 Door 2 Door Frame 3 Joint 4 Tablets 5. Keyhole 6 Latch 7 Latch receiving part 8 Engagement groove 10 keys 11 Handle 12 key axis 13 Branch

Claims

1. In a joint lock unlocking structure, a keyhole of a lock body attached to a structure is provided at the back of a joint between an outward-opening door and the adjacent structure, and the door is unlocked by inserting a key shaft of a key into the keyhole to open the door, The door has an engagement groove formed on a surface facing the joint in the projection direction, The key is provided with a branch rod that branches off midway along the axial direction of the key shaft, When the tip of the key shaft of the key is inserted into the keyhole and rotated, the latch of the lock body retreats and disengages from the latch receiving portion of the door, and the branch rod engages with the engagement groove, When the key is pulled toward the door in this state, the door is pulled toward the door together with the key, and the door is opened.

2. Before the key shaft is removed from the keyhole, the rear side of the latch receiving portion of the door reaches a position facing the tip of the latch, 2. The joint lock unlocking structure according to claim 1, wherein the latch protrudes after the key shaft is removed from the keyhole.

3. The locking mechanism for unlocking a joint lock as described in claim 1 or 2, characterized in that when the tip of the key shaft is inserted into the keyhole, the key shaft is positioned in the forward direction, and accordingly, the key shaft rotates with the branch rod positioned relative to the engagement groove of the door.

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