Emergency unlocking device for sliding doors

Abstract

To provide an emergency unlocking device for sliding doors that is easy to install and can be smoothly unlocked in an emergency without being affected by the offset in which positions of a bolt insertion hole and a locking insertion hole are misaligned in a depth direction of a warehouse.SOLUTION: The emergency unlocking device for sliding doors includes: an operation shaft 10 that passes through a through hole 1b provided on a side part of an opening 2 of a warehouse and has a threaded portion at the other end on the outside of the warehouse; a lock receiving metal fitting 20 that is provided on the side part of the opening and has a rotation stop protrusion that is removably fitted into a recess provided on the side part of the opening, an operation shaft insertion hole 25 through which the operation shaft is inserted, and a first locking insertion hole 26; a screw receiving member 30 that is screwed into the threaded portion of the operation shaft inserted through the operation shaft insertion hole; a locking device 50 that locks a latch metal fitting 40 attached to a sliding door 3 and a lock receiving metal fitting with the opening closed. The operation shaft insertion hole is formed by an inclined groove having an open portion 25a at one end on the outside where the slide door closes the opening, and having a slope from the open portion to the other end on the slide door side.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an emergency unlocking device for a sliding door, and more particularly to an emergency unlocking device for a sliding door that opens and closes an opening of a warehouse such as a refrigerator or a storage.

Background Art

[0002] Conventionally, for a sliding door that opens and closes an opening of a warehouse such as a refrigerator or a storage, for the purpose of preventing theft and the like, a hanging fitting attached to the tip of the sliding door and a bolt member that is disposed on the side of the opening and penetrates from the inside of the warehouse are used. A locking instrument is locked in a locking insertion hole provided in each of the locking receiving fittings fastened and fixed, and the door is locked.

[0003] Also, in this type of warehouse, since there is a risk that an operator may be accidentally confined inside the warehouse, in an emergency, the bolt member is loosened to remove the locking receiving fitting and open the sliding door that closes the opening of the warehouse from the inside of the warehouse. An emergency opening device is known (see, for example, Patent Document 1).

[0004] In the emergency opening device described in Patent Document 1, a bolt member that penetrates from the inside of the warehouse is inserted into a first fitting (hereinafter referred to as a locking receiving fitting) disposed on the side of the opening of the warehouse, and a bolt insertion hole formed by a notch groove having an opening portion in a direction in which the sliding door closes the opening is provided. A structure is disclosed in which a second fitting provided with a nut that screws onto a threaded portion of a bolt member inserted into the notch groove of the locking receiving fitting is positioned on the side of the opening together with the locking receiving fitting via a positioning member. In addition, in a state where the opening is closed, a locking instrument is locked in a locking insertion hole provided in each of the hanging fitting attached to the tip of the sliding door and the locking receiving fitting, and the door is locked.

[0005] According to the emergency opening device described in Patent Document 1, in an emergency, the threaded portion of the bolt member and the nut of the second fitting are loosened, the bolt member is moved inward, and then pushed outward, which detaches the positioning member and removes the second fitting and the lock receiver from the side of the opening. In this state, when the sliding door is slid in the opening direction, the bolt member inserted through the notched groove detaches from the opening of the notched groove and moves the sliding door in the opening direction. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 4644398 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, in the emergency release device described in Patent Document 1, the bolt insertion hole through which the bolt member is inserted is formed by a notched groove having an opening in the direction in which the sliding door closes the opening, in other words, in the horizontal direction. Therefore, if the positions of the bolt insertion hole and the locking insertion hole are offset relative to the depth direction of the warehouse, the locking receiver may rotate when unlocking, causing the bolt insertion hole to tilt, which may prevent smooth unlocking. To solve this problem, if the locking receiver is designed to eliminate the offset, the locking insertion hole through which the locking device is locked must have a tolerance in shape and dimensions in relation to the latch on the sliding door side, which may impose restrictions on the shape and dimensions of the locking receiver itself. Furthermore, if the bolt member and the locking insertion hole are aligned in a straight line and an elongated hole is cut horizontally to eliminate the offset, it becomes weak against impact, and if the door is pulled forcefully, the locking receiver may come off without loosening the threads between the bolt member and the nut, even if it is locked.

[0008] Furthermore, in the emergency release device described in Patent Document 1, the positioning of the lock receiver toward the opening is performed by a positioning member connecting the lock receiver and the second fitting. This results in a large number of components, and requires processing of both the lock receiver and the second fitting, raising concerns that positioning and installing the lock receiver will be time-consuming. In addition, in an emergency, the lock is unlocked by loosening the threaded portion of the bolt member and the nut of the second fitting, moving the bolt member inward, and then pushing it outward to remove the positioning member. This raises concerns that unlocking may not be smooth.

[0009] This invention has been made in view of the above circumstances, and aims to provide an emergency unlocking device for a sliding door that is not affected by the offset in which the positions of the bolt insertion hole and the locking insertion hole provided in the locking receiver are shifted relative to the depth direction of the warehouse, and that can be easily attached to the side of the opening of a warehouse and that can be unlocked smoothly in an emergency. [Means for solving the problem]

[0010] To solve the above problems, the emergency unlocking device for a sliding door according to this invention , storehouse An emergency unlocking device for a sliding door that opens and closes the opening of a warehouse, comprising: an operating shaft that is inserted through a through hole provided on the side of the opening of the warehouse, with an operating member fixed to one end on the inside of the warehouse and a threaded portion on the other end on the outside of the warehouse; a positioning and rotation-stopping projection positioned on the side of the opening of the warehouse and detachably fitted into a recess provided on the side of the opening; an operating shaft insertion hole through which the operating shaft is inserted; and a first locking Through hole The device comprises: a locking receiver having; a screw receiving member that screws onto the threaded portion of the operating shaft through which the operating shaft is inserted; and a locking device that, with the opening closed, locks a second locking insertion hole provided in a latch attached to the sliding door and the first locking insertion hole of the locking receiver, wherein the operating shaft insertion hole has an open portion at one end on the outside where the sliding door closes the opening, and is formed by an inclined groove that slopes toward the other end on the sliding door side from the open portion (Claim 1).

[0011] With this configuration, when unlocking, the rotation of the operating shaft by the operating member loosens the screw connection between the operating shaft and the screw receiving member. Simultaneously, the rotation of the operating shaft causes the lock receiving fitting to rotate via the screw receiving member, bringing the operating shaft insertion hole closer to the sliding door, resulting in smoother unlocking.

[0012] In this invention, it is preferable that a nut is screwed onto the threaded portion on the inside of the operating shaft, and that the operating member fixed to the outer circumference of the nut is provided with a recess for accommodating the end of the operating shaft that protrudes from the nut (Claim 2).

[0013] With this configuration, rotating the operating member in the tightening direction of the screw fastens and secures the lock receiver between the screw receiving member, which has a threaded portion that screws onto the threaded portion of the operating shaft, and the operating member, which is fixed to the nut. When unlocking, rotating the operating member in the loosening direction opposite to the tightening direction of the screw widens the gap between the screw receiving member and the operating member, and the anti-rotation projection that is fitted into the recess disengages from the recess. At this time, the inside end of the operating shaft that screws onto the nut protrudes from the nut but is housed in the recess provided in the operating member, so that the lock receiver can be attached and detached by rotating the operating member alone.

[0014] Furthermore, in this invention, it is preferable that the operating shaft insertion hole is provided in a symmetrical inclined direction at a vertically symmetrical position of the lock receiving fitting (Claim 3).

[0015] This configuration allows the same shaped locking mechanism to be applied to both sliding doors that open and close to either the left or the right.

[0016] In addition, in this invention, the lock receiver is preferably composed of an inner piece having the rotation-stopping projection and the operating shaft insertion hole, an outer piece having the first locking insertion hole, and a connecting piece connecting the inner piece and the outer piece to the sliding door side ends, and the screw receiving member is preferably formed of a plate-shaped member that can engage with the connecting piece as it rotates due to the rotation of the operating shaft when unlocking (Claim 4). In this case, it is preferable that the rotation-stopping projection and the operating shaft insertion hole are provided in vertically symmetrical positions on the inner piece, and the operating shaft insertion hole is provided in a symmetrical inclined direction (Claim 5).

[0017] With this configuration, when unlocking, the rotation of the operating shaft by the operating member loosens the screw engagement between the operating shaft and the screw receiving member. As the operating shaft rotates, the plate-shaped screw receiving member engages with the connecting piece, causing the lock receiving fitting to rotate. This brings the operating shaft insertion hole closer to the sliding door, resulting in smoother unlocking. In this case, the rotation-stopping projection and the operating shaft insertion hole are provided in vertically symmetrical positions on the inner piece, and the operating shaft insertion hole is provided in a symmetrically inclined direction. This allows the lock receiving fitting of the same shape to be applied to both sliding doors that open and close to either the left or the right. [Effects of the Invention]

[0018] According to this invention, since it is configured as described above, the following remarkable effects can be obtained.

[0019] (1) According to the invention described in claims 1 and 4, when unlocking, the rotation of the operating shaft by the operating member loosens the screw engagement between the operating shaft and the screw receiving member, and as the operating shaft rotates, the lock receiving fitting rotates via the screw receiving member, causing the operating shaft insertion hole to move closer to the sliding door, thus making unlocking smoother. Therefore, the offset in which the positions of the bolt insertion hole and the locking insertion hole provided in the lock receiving fitting are shifted relative to the depth direction of the warehouse makes it easy to install on the side of the warehouse opening and allows for smooth unlocking in emergencies.

[0020] (2) According to the invention described in claim 2, since the attachment and detachment of the lock receiver fitting can be performed only by rotating the operation member, the attachment of the lock receiver fitting and unlocking can be easily performed.

[0021] (3) According to the inventions described in claims 3 and 5, since the lock receiver fitting having the same shape can be applied to both of the slide doors that open and close to either the left or the right, reduction of members can be achieved, freedom in the design of the lock receiver fitting can be provided, and freedom in the arrangement of the lock receiver fitting and the locking device can be provided.

Brief Description of the Drawings

[0022] [Figure 1] It is a schematic front view showing a refrigerator provided with the emergency unlocking device according to this invention. [Figure 2] It is a cross-sectional view showing a main part at the time of locking of the emergency unlocking device according to this invention. [Figure 3] It is a cross-sectional view showing the fitting state of the rotation stopper projection in this invention. [Figure 4] [[ID=2I]]It is a cross-sectional view of the main part along the line I-I of FIG. 2. [Figure 5] It is a perspective view showing the main part in the locked state. [Figure 6] It is a front view (a), a plan view (b), a left side view (c), and a right side view (d) of the lock receiver fitting in this invention. [Figure 7] It is a perspective view (a) showing the front, plan, and left side of the above lock receiver fitting, and a perspective view (b) showing the front, plan, and right side. [Figure 8] It is a cross-sectional view showing the state of the operating shaft, the lock receiver fitting, and the screw receiving member at the time of unlocking. [Figure 9] It is a front view showing the state of the lock receiver fitting and the screw receiving member at the time of unlocking.

Mode for Carrying Out the Invention

[0023] It should be noted that in the above translation, there is a misrepresentation in the translation of "図2のI-I線に沿う要部断面図である." in item . It should be "It is a cross-sectional view of the main part along the line I-I of FIG. 2." instead of "It is a cross-sectional view of the main part along the line I-I of FIG. 2. ". The correct translation should be as shown in the above content. Also, there may be some inaccuracies in the original text's grammar and punctuation. When dealing with patent texts, it is recommended to double-check with the original language's relevant regulations and standards for a more accurate understanding.The embodiments for carrying out this invention will be described in detail below with reference to the attached drawings. Here, we will describe the case in which the emergency unlocking device for a sliding door according to this invention is applied to a prefabricated refrigerator.

[0024] As shown in Figure 1, the sliding door 3 is configured to open and close the opening 2, which is provided in the insulated wall panel 1a and floor panel 1d of the refrigerator 1, by suspension wheels 5 that roll on a guide rail 4 located above the opening 2. The guide rail 4 and suspension wheels 5 are covered by a rail cover 7. When the opening 2 is closed, the sliding door 3 abuts against the lower door stopper 6a, and when the opening 2 is open, it abuts against the lower door stopper 6b.

[0025] The opening 2 is formed by an entrance frame 2a fixed to the lateral end of the wall panel 1a via a joint member 2b. A reinforcing member 2d is interposed between the entrance frame 2a and the wall panel 1a on the side of the opening 2 facing the outside of the storage area. Through holes 1b are provided in the wall panel 1a, the entrance frame 2a, and the reinforcing member 2d on the side of the opening 2.

[0026] The emergency unlocking device is provided on the side of the opening 2 of the refrigerator 1 and on the closed end of the sliding door 3. As shown in Figures 2 to 5, it mainly consists of an operating shaft 10 that passes through the through hole 1b provided on the side of the opening 2, a locking bracket 20 positioned on the side of the opening 2 and having an operating shaft insertion hole 25 through which the operating shaft 10 passes, a screw receiving member 30 that screws onto the threaded portion 11 of the operating shaft 10 that passes through the operating shaft insertion hole 25, and a locking device 50 that locks the latch 40 attached to the sliding door 3 and the locking bracket 20 when the opening 2 is closed.

[0027] As shown in Figure 2, the operating shaft 10 has a nut 13 screwed onto a threaded portion 11 on the inside of the chamber, and an operating member 12 fixed to the outer circumference of the nut 13 is provided with a recess 12a that accommodates the end of the operating shaft 10 protruding from the nut 13.

[0028] The lock receiver 20 has a positioning and rotation-preventing projection 24 that is detachably fitted into a recess 1c provided on the side of the opening 2, an operating shaft insertion hole 25 through which the operating shaft 10 is inserted, and a first locking insertion hole 26. The operating shaft insertion hole 25 has an open portion 25a at one end on the outside where the sliding door 3 closes the opening 2, and is formed as an inclined groove with a slope from the open portion 25a toward the other end on the sliding door 3 side.

[0029] Furthermore, as shown in Figures 6 and 7, the lock receiver 20 is composed of an inner piece 21 having a rotation-stopping projection 24 and an operating shaft insertion hole 25, an outer piece 22 having a first locking insertion hole 26, and a connecting piece 23 that connects the sliding door side ends of the inner piece 21 and the outer piece 22. In this case, the rotation-stopping projection 24 is located on the vertically outward side of the operating shaft insertion hole 25 and is formed by a pin that is fitted into a through hole 21a provided in the inner piece 21 and welded from the inside (see Figures 3 and 8). The rotation-stopping projection 24 and the operating shaft insertion hole 25 are provided in vertically symmetrical positions on the inner piece 21, and the operating shaft insertion hole 25 is provided in a symmetrical inclined direction. In this case, the upper operating shaft insertion hole 25 has a downward slope toward the end on the sliding door 3 side, and the lower operating shaft insertion hole 25 has an upward slope toward the end on the sliding door 3 side. Furthermore, the first locking insertion hole 26 is formed as an elongated hole extending in the vertical direction, provided at vertically symmetrical positions on the outer piece 22. Note that the first locking insertion hole 26 does not necessarily have to be two elongated holes extending in the vertical direction, but may be a single elongated hole. In addition, mounting holes 23a are drilled at appropriate intervals in the vertical direction of the center of the connecting piece 23. Fixing screws 29 are screwed into these mounting holes 23a, passing through the cover member 27 which is fitted over the lock receiving fitting 20 and the stopper rubber 28 which the sliding door 3 abuts.

[0030] The screw receiving member 30, which is screwed onto the threaded portion 11 of the operating shaft 10 through the operating shaft insertion hole 25, is formed as a plate nut, which is a plate-shaped member that can engage with the connecting piece 23 of the lock receiving fitting 20 as the operating shaft 10 rotates in the loosening direction during unlocking.

[0031] The locking device 50 is a padlock having a substantially U-shaped locking portion 51 that locks into a second locking insertion hole 44 provided in a latch 40 attached to the sliding door 3 and a first locking insertion hole 26 provided in the outer piece 22 of the lock receiving bracket 20 when the opening 2 is closed.

[0032] As shown in Figures 2 and 5, the latch 40 is formed as a hinge consisting of a fixing piece 41 fixed to the closed end of the sliding door 3 and a latch 42 pivotally attached to the fixing piece 41 via a hinge portion 43, and a second locking insertion hole 44 extending in the vertical direction is provided in the latch 42.

[0033] In the emergency unlocking device configured as described above, the lock receiver 20 is fastened and fixed to the nut 13 by rotating the operating member 12 in the screw tightening direction with the rotation-stopping projection 24 positioned to correspond to the recess 1c provided on the side of the opening 2, and screwing the screw receiver 30 onto the threaded portion 11 of the operating shaft 10 that has been inserted through the operating shaft insertion hole 25. In an emergency, the operating member 12 is rotated in the loosening direction opposite to the screw tightening direction, which widens the gap between the screw receiver 30 and the operating member 12, causing the rotation-stopping projection 24, which is fitted into the recess 1c, to disengage from the recess 1c (see Figure 8). At this time, the inside end of the operating shaft 10 that is screwed into the nut 13 protrudes from the nut 13, but is housed in the recess 12a provided in the operating member 12. Therefore, the lock receiver 20 can be attached and detached simply by rotating the operating member 12 in the forward and reverse directions.

[0034] According to the emergency unlocking device of the above embodiment, when unlocking, the rotation of the operating shaft 10 by the operating member 12 loosens the screw engagement between the operating shaft 10 and the screw receiving member 30. As the operating shaft 10 rotates, the screw receiving member 30 engages with the lock receiving bracket 20, causing the lock receiving bracket 20 to rotate, which brings the operating shaft insertion hole 25 closer to the sliding door, thus enabling smooth unlocking. Therefore, the position of the operating shaft insertion hole 25 and the first locking insertion hole 26 provided in the lock receiving bracket 20 are not affected by the offset, which is a misalignment with respect to the warehouse depth, making it easy to attach to the side of the opening 2 of the refrigerator 1 and enabling smooth unlocking in emergencies.

[0035] Furthermore, according to the emergency unlocking device of the above embodiment, the lock receiver 20 can be fastened and fixed to the side of the opening 2 by rotating the operating member 12 in the tightening direction, and the lock receiver 20 can be removed from the side of the opening 2 by rotating the operating member 12 in the loosening direction, thus making unlocking easier.

[0036] Furthermore, in the emergency unlocking device of the above embodiment, the rotation-stopping projection 24 and the operating shaft insertion hole 25 are provided at vertically symmetrical positions on the inner piece 21, and the operating shaft insertion hole 25 is provided in a symmetrical inclined direction. In addition, the first locking insertion hole 26 is formed as a vertically extending elongated hole provided at vertically symmetrical positions on the outer piece 22. Therefore, since the same shaped lock receiving bracket 20 can be applied to both the left and right sliding doors 3, the number of components can be reduced, the design of the lock receiving bracket 20 can be made more flexible, and the arrangement of the lock receiving bracket 20 and the locking device 50 can be made more flexible.

[0037] In the above embodiment, the emergency unlocking device according to this invention was described in the case where it is applied to a refrigerator, but it can also be applied to storage facilities other than refrigerators and other warehouses. [Explanation of Symbols]

[0038] 1. Refrigerator (warehouse) 1b Through hole 1c recess 2 openings 3 Sliding doors 10 Operation axis 11 Threaded part 12 Operating member 12a Recess 13 nuts 20 Lock strike plate 21 Inner piece 22 Outer piece 23 Connecting piece 24 Positioning and rotation-stopping projection 25 Operating shaft insertion hole 25a Open area 26 First locking insertion hole 30 Screw receiving member 31 screw holes 40 Hanging hardware 44 Second locking insertion hole 50 Locking devices 51 Locking mechanism

Claims

1. An emergency unlocking device for a sliding door that opens and closes the opening of a warehouse, An operating shaft is inserted through a through hole provided on the side of the opening of the above warehouse, with an operating member fixed to one end on the inside of the warehouse and a threaded portion at the other end on the outside of the warehouse. A locking bracket having a positioning and rotation-preventing projection positioned on the side of the opening of the warehouse and detachably fitted into a recess provided on the side of the opening, an operating shaft insertion hole through which the operating shaft is inserted, and a first locking insertion hole, A screw receiving member that screws onto the threaded portion of the operating shaft through which the operating shaft insertion hole is inserted, With the above-mentioned opening closed, the device comprises a second locking through-hole provided in the latch attached to the sliding door and a locking device that locks into the first locking through-hole of the lock receiving bracket, The above operating shaft insertion hole has an open portion at one end on the outside where the sliding door closes the opening, and is formed by an inclined groove that slopes toward the other end on the sliding door side from the open portion. An emergency unlocking device for a sliding door, characterized by the following features.

2. An emergency unlocking device for a sliding door according to claim 1, An emergency unlocking device for a sliding door, characterized in that a nut is screwed onto the threaded portion on the interior side of the operating shaft, and the operating member fixed to the outer circumference of the nut is provided with a recess for accommodating the end of the operating shaft that protrudes from the nut.

3. An emergency unlocking device for a sliding door according to claim 1, An emergency unlocking device for a sliding door, characterized in that the operating shaft insertion hole is provided in a symmetrical inclined direction at a vertically symmetrical position on the lock receiving bracket.

4. An emergency unlocking device for a sliding door according to claim 1, The lock receiver is comprised of an inner piece having a rotation-stopping projection and an operating shaft insertion hole, an outer piece having a first locking insertion hole, and a connecting piece connecting the inner piece and the outer piece to the sliding door side ends, and the screw receiving member is formed of a plate-shaped member that can engage with the connecting piece as it rotates due to the rotation of the operating shaft during unlocking, characterized in that it is an emergency unlocking device for a sliding door.

5. An emergency unlocking device for a sliding door according to claim 4, An emergency unlocking device for a sliding door, characterized in that the rotation-stopping projection and the operating shaft insertion hole are provided at vertically symmetrical positions on the inner piece, and the operating shaft insertion hole is provided in a symmetrically inclined direction.

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