KR102581741B1 - Locking device of door for ceiling access hole - Google Patents

Abstract

The present invention relates to a locking apparatus for a door for a ceiling check hole, which comprises: a body member having a latch operation hole formed in a transversal direction on one end unit side, and an inclined block formed on an upper end on one side in an inner side; an elevation member including a handle unit having one end surface exposed to an opening unit when the body member is engaged with the door, a bump unit extended in a direction crossing the latch operation hole, and a first elastic body exerting an elastic compression and restoration force in the extending direction of the bump unit for the elevation to be conducted with a protruding end formed on one side surface; an operation button including a pressing operation unit exposed to the opening unit when the body member is engaged with the door, a hanging bump supporting the protruding end when the elevation member is elevated and lowering the elevation member by deviating the protruding end when the pressing operation unit is pressed, a second elastic body exerting an elastic pressing force to the elevation member on the opposite side to the hanging bump, and an inclined surface unit in surface-contact with the inclined block of the body member and sliding along the inclined block when the pressing operation unit is pressed, and forming a gap from the inclined block; and a latch which, when the elevation member is elevated, is cross-engaged with the bump unit, hangs on the frame and locks the door on the frame, and when the elevation member is lowered, is separated from the bump unit to elastically operate to the frame in the latch operation hole, and thus, unlocks the door from the frame. Therefore, work convenience can be greatly improved.

Description

Locking device of door for ceiling access hole}

The present invention relates to a ceiling inspection opening installed on a ceiling panel that shields facilities such as heating/water supply pipes or electrical wiring arranged on the ceiling side of a building to allow workers to open and work when inspecting the facilities. This relates to a locking device for a ceiling inspection door that allows the door to be locked or opened when opening or closing the door.

Generally, anchors are embedded in the lower part of the ceiling slab on each floor of a building, and facilities such as water/sewer pipes, heating pipes, and electrical wiring are installed. Additionally, in order to prevent these facilities from being exposed to the outside, damaging their aesthetics or causing accidents due to falls, they are finished with ceiling panels.

In addition, a ceiling inspection port is installed on the ceiling panel to allow workers access for regular or irregular inspection and repair of the facility. The ceiling inspection port is designed to prevent damage to the exterior of the ceiling in consideration of the interior of the building. It is designed to take into account the external design and allow inspection of piping and wiring placed on the ceiling without removing the ceiling panel.

These ceiling inspection openings are usually composed of an outer frame and a door. The outer frame is made of a square frame fixed to the ceiling panel, and the door is made of a square plate joined to the inner peripheral surface of the outer frame and is connected through a hinge and an opening and closing device. It is combined with the outer frame.

In particular, the door of the ceiling inspection opening is fixed to the outer frame in a closed state by a predetermined locking device, and when opening the door, the door can be opened by releasing the locking device.

Patent Document 1 of the following prior art documents shows a representative example of a locking device for a ceiling inspection opening. This locking device consists of a rotating rod that can be rotated using a rotating groove exposed to the outside, and a lock that locks or unlocks the door by rotating according to the rotation of the rotating rod. However, in a structure such as Patent Document 1, when a door that has been locked by a lock is unlocked, the door suddenly opens from the ceiling and comes down due to the load of the door itself, raising the risk of injury to the worker under the door. .

Patent Document 2 improves this problem and shows a ceiling inspection opening equipped with a buffer device that allows the door to be opened and closed stably from the outer frame installed on the ceiling when locked or unlocked. However, since the shock absorber shown here is composed of various accessories such as a main body, a rod, and a plurality of connection means, the manufacturing cost of the ceiling inspection hole increases, and the assembly work also requires a lot of time, so there is a problem of low productivity.

Meanwhile, in the case of Patent Documents 1 and 2, the locking device for opening and closing the door is structured to be locked or unlocked by the worker's rotation operation. Therefore, there is a problem that tools or extensions are absolutely necessary to rotate the locking device when opening and closing the door, and that the operation of rotating the locking device is inevitably somewhat inconvenient.

Republic of Korea Utility Model Publication No. 20-2018-0001289 (published on May 4, 2018) Republic of Korea Utility Model Registration No. 20-0488517 (announced on February 14, 2019)

The present invention was developed to improve the conventional problems as described above, and the locking or unlocking operation can be performed very easily without separate tools or extensions, and the door locking operation can be performed very smoothly and simply. The purpose is to provide a locking device for the inspection door.

The present invention for achieving the above object is mounted on an opening provided in the door in a ceiling inspection opening including a frame installed on the ceiling and a door that opens and closes with respect to the frame, and locks or unlocks the door to the frame. It is a locking device for a door for a ceiling inspection opening that is made of a hollow structure coupled to the opening of the door, and has a body with a latch operation hole formed laterally on one end and an inclined block formed on the top of one inner side. absence; It is inserted into the interior of the body member to be capable of lifting and lowering, and includes a handle portion exposed to the opening when the body member is coupled to the door, a protrusion extending in a direction intersecting the latch operation hole, and a protrusion formed on one side. a lifting member having a protruding end and a first elastic body that emits elastic compression and restoring force along an extending direction of the protruding portion to enable the lifting operation; A pressing operation part that is inserted into the interior of the body member while facing the lifting member and is exposed to the opening when the body member is coupled to the door, and supports the protruding end in the raised state of the lifting member and A locking protrusion that disengages the protruding end and causes the lifting member to descend when the pressing operation unit is pressed, a second elastic body that emits an elastic pressing force against the lifting member on the opposite side of the locking protrusion, and an inclined block of the body member; An operation button provided with an inclined surface portion that slides along the inclined block and forms a gap with the inclined block when the pressing operation portion is pressed during surface contact; It is inserted and coupled to the latch operating hole of the body member so as to be elastically operable in the transverse direction relative to the frame, and is cross-coupled with the protrusion when the lifting member is in a raised position, thereby locking the door to the frame. It is in a locked state, and when the lifting member is in the lowered position, it is separated from the protrusion and can be elastically operated against the frame in the latch operation hole, thereby including a latch that unlocks the door with respect to the frame. .

In the present invention, an inwardly bent flange is formed at the opening of the door, a fixing groove is formed around the lower part of the body member in contact with the opening, and the inner part of the door is provided in a state where the lower part of the body member is inserted into the opening. A fixing pin that is coupled to the fixing groove and fixes the body member to the door while pressing the flange on the side may be further provided.

In particular, the lower part of the body member in contact with the opening has a square cross-sectional structure, the fixing grooves are formed at three of the four corners of the square cross-sectional structure, and the fixing pins are coupled to the fixing grooves at the three corners. It may be formed in a ‘ㄷ’ shape.

In the present invention, the push control part of the control button may be provided with a press mark at the point of application of a force that causes the locking protrusion to disengage the protruding end during a press operation.

In particular, the push mark portion may have a protruding structure.

In the present invention, a first pin insertion hole is formed in the body member, and a vertical long hole is formed in the elevating member to maintain communication with the first pin insertion hole during the elevating operation of the elevating member. A first pin may be provided that is inserted into the 1-pin insertion hole and the vertical long hole to couple the lifting member to the body member to enable a lifting operation.

In the present invention, a second pin insertion hole is formed in the body member, a coupling hole communicating with the second pin insertion hole is formed in the operation button, and is inserted into the second pin insertion hole and the coupling hole to attach the operation button to the body member. A second pin that couples may be provided.

In the present invention, a third pin insertion hole is formed in the body member, and a long horizontal long hole is formed in the latch in the longitudinal direction to maintain communication with the third pin insertion hole when the latch operates elastically in the longitudinal direction, When the latch is inserted into the latch operation hole of the body member, a third pin may be provided that is inserted into the third pin insertion hole and the horizontal long hole to couple the latch to the body member to enable horizontal operation.

In the present invention, an elastic insertion portion is formed inside the latch in the longitudinal direction of the latch, and this elastic insertion portion is inserted between the third pin and the elastic insertion portion so that when the latch is elastically operated against the frame in the latch operation hole. A third elastic body that provides elastic force may be provided.

The locking device for the ceiling inspection door according to the present invention configured as described above can lock and unlock the door with respect to the frame simply by pressing the lifting member and the operation button with a finger, so that the closing and locking operations of the door are easy. Because it is done very smoothly and simply, the operator's work convenience is greatly improved.

In addition, the locking device of the present invention maintains the locked state on the same plane as the door surface without protruding from the door surface, thereby maintaining the appearance of the door.

Figure 1 is a perspective view showing a ceiling inspection opening equipped with an embodiment of the present invention.
Figure 2 is a perspective view showing the state after pressing the operation button of the locking device in Figure 1.
Figure 3 is a perspective view showing when the door in Figure 2 is opened.
Figure 4 is a perspective view showing when the door in Figure 3 is fully opened.
Figure 5 is a perspective view showing an embodiment of the locking device according to the present invention.
Figure 6 is a perspective view of the picture in Figure 5 rotated 90 degrees to the right.
Figure 7 is a perspective view of the picture in Figure 6 as seen from the bottom side.
Figure 8 is a plan view of the locking device of Figure 5.
Figure 9 is an exploded perspective view of the locking device of Figure 5.
Figure 10 is a perspective view of the bottom of the body member constituting the present invention.
Figure 11 is a side view showing the lifting member constituting the present invention.
Figure 12 is a side view showing the operation button constituting the present invention.
Figure 13 is a cross-sectional view taken along line AA of Figure 8.
Figure 14 is a view showing a state in which the door of the ceiling inspection opening is locked to the frame by the locking device of the present invention.
Figure 15 is a diagram showing a state in which the latch is released by operating the operation button provided in the present invention.
FIG. 16 is a diagram showing a state in which the door is opened from the state of FIG. 15.

Hereinafter, with reference to the attached drawings, preferred embodiments will be described in detail so that those skilled in the art can easily practice the present invention. However, when explaining in detail the operating principle of a preferred embodiment of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

<Configuration of the embodiment>

First, Figures 1 to 4 each show a ceiling inspection opening equipped with an embodiment of the present invention, and the components of the ceiling inspection opening are divided into a frame (1) and a door (2). In the drawing, a frame (1) is installed on the ceiling panel of a building, and the door (2) is coupled to the frame (1) via a hinge (2a) to open and close the frame (1). In particular, in these drawings, the door 2 is drawn upward for convenience, but when actually installed on the ceiling of a building, the door 2 faces downward.

The door 2 is provided with an opening 2b into which the locking device 100 of the present invention is mounted. In this embodiment, the opening 2b is presented in a square shape. In addition, a flange 2c is formed around the opening 2b and is bent inward (i.e., bent toward the ceiling). As will be described later, this flange 2c is used to secure the locking device 100 of the present invention. It is useful when fixing to the door (2).

5 to 9 are views showing various aspects of an embodiment of the locking device 100 according to the present invention. The locking device 100 is mounted on the opening 2b of the door 2 to secure the door 2. It operates in a locked or unlocked state with respect to the frame (1).

The components of the locking device 100 can be viewed as divided into a body member 110, an elevating member 120, an operation button 130, and a latch 140. 9, the upper and lower sides of the drawing will be described as the upper and lower sides of each of the components, and the left and right sides of the drawing will be described as the left and right sides of the components.

The body member 110 is the main body of the locking device and has a hollow structure, and is directly coupled to the opening 2b of the door 2. A latch operating hole 111 penetrating in the transverse direction is formed at one end (i.e., near the upper side) of the body member 110, so that the latch 140 is mounted in the transverse direction. And, as can be seen in FIGS. 10 and 13, an inclined block 112 having a downwardly sloping slope is formed at the upper end of one inner side of the body member 110.

As shown in FIGS. 9, 11, and 13, the lifting member 120 is inserted into the interior of the body member 110, and the lower end of the lifting member 120 is used to open and close the door 2 of the attachment inspection port. This forms a handle portion 121 that the worker can hold with his or her fingers. When the body member 110 is coupled to the door 2, the handle portion 121 has one end surface (ie, the bottom surface) exposed to the outside through the opening 2b of the door 2. A protrusion 122 extending in a direction intersecting the latch operating hole 111 is formed at the upper end of the lifting member 120. In particular, the lifting member 120 can perform a lifting operation within the body member 110. For this purpose, a first elastic body 123, such as a coil spring, is provided at the upper end of the lifting member 120 in parallel with the protrusion 122. It is provided. That is, the first elastic body 123 generates elastic compression and restoring force along the direction in which the protrusion 122 extends, thereby enabling the lifting operation of the lifting member 120. In the embodiment shown in the drawings, a pair of first elastic bodies 123 are provided next to the protrusion 122, but it may also be composed of a single coil spring surrounding the protrusion 122. In order to maintain a stable installation state of the first elastic body 123, a seating groove 124 in which the lower end of the first elastic body 123 is seated is formed at the upper end of the lifting member 120, and correspondingly, the body member 110 ) A seating groove 113 in which the upper end of the first elastic body 123 is seated may be formed on the inner upper surface. Meanwhile, a protruding end 125 is formed on one side of the lifting member 120 (i.e., the side facing the operation button 130). This protruding end 125 protrudes toward the operation button 130, so that it can be supported by or separated from the operation button 130, as will be described later.

Next, the operation button 130 is inserted into the interior of the body member 110 while facing the lifting member 120, as shown in FIGS. 9, 12, and 13. The lower end of the operation button 130 is provided with a pressing operation portion 131 that is exposed to the opening 2b of the door 2 when the body member 110 is coupled to the door 2 of the ceiling inspection opening. At the portion facing the lifting member 120 at the operation button 130, the protruding end 124 of the lifting member 120 is placed from below when the lifting member 120 is in an elevated state inside the body member 110. A locking protrusion 132 is formed to support and prevent the lifting member 120 from descending. Then, when the pressing operation unit 131 is pressed with a finger or a hand tool, the locking protrusion 132 pushes up the protruding end 124 and the protruding end 124 is separated from the locking protrusion 132, as shown in FIG. 15. The lifting member 120 is lowered as shown. In particular, the pressing operation unit 131 may be provided with a pressing marking portion 131a at the point of application of the force that causes the locking protrusion 132 to disengage the protruding end 124 during the pressing operation. This push indicator portion (131a) allows the operator at the ceiling inspection hole to easily recognize the appropriate pressing position of the push operation portion (131). Moreover, it is preferable that the press mark portion 131a has a protruding structure. This protruding structure allows the pressing force to be concentrated from the press mark portion 131a toward the locking protrusion 132 during the pressing operation, thereby forming the protruding end 124. ) has the effect of being easily removed. Meanwhile, on the opposite side of the locking step 132 from the operation button 130, a second elastic body 133 is installed that emits an elastic pressing force to press the operation button 130 against the lifting member 120. In order to maintain a stable installation state of the second elastic body 133, an insertion groove 134 may be formed at the installation position of the operation button 130. On the surface facing the lifting member 120 above the locking step 132 of the operation button 130, an inclined block ( An inclined surface portion 135 that comes into surface contact with 112) is formed. This inclined surface portion 135 is in surface contact with the inclined block 112, as shown in FIGS. 13 and 14, and slides along the inclined block 112 when the pressing operation unit 131 is pressed, forming a gap with the inclined block 112. By forming, the protruding end 124 can be separated from the stopping protrusion 132.

Next, as shown in FIGS. 6 and 13, the latch 140 is roughly shaped like an arrowhead and is a means of locking or unlocking the door 2 against the frame 1 of the ceiling inspection opening. The latch 140 is inserted and coupled to the latch operating hole 111 of the body member 110 so as to be elastically operable in the transverse direction (i.e., the longitudinal direction of the latch) with respect to the frame. That is, an elastic insertion portion 141 is formed inside the clasp 140 in the longitudinal direction of the clasp 140, and the third elastic body 142 is provided in this elastic insertion portion 141, so that the third elastic body 142 ) allows the latch 140 to operate elastically against the frame 1 in the latch operating hole 111. In particular, a protrusion insertion hole 143 is formed at the rear position of the elastic insertion portion 141 of the catch 140, so that when the elevating member 120 is in an elevated position as shown in FIG. 14, the protrusion 122 of the elevating member 120 As it is inserted into the protruding insertion hole 143, it is cross-coupled with the latch 140. Accordingly, the latch 140 maintains a locked state against the frame 1 of the ceiling inspection opening, thereby locking the door 2 to the frame 1. In addition, as shown in FIG. 15 , when the lifting member 120 is in the lowered position, the protrusion 122 comes out of the protrusion insertion hole 143 and is separated from the stopper 140. Accordingly, the latch 140 can be elastically operated against the frame 1 in the latch operation hole 111 of the body member 110, thereby putting the door 2 in an unlocked state with respect to the frame 1. .

Meanwhile, the locking device 100 of the present invention can be mounted on the door 2 of the ceiling inspection opening by various means. As an example, the following configuration can be added. First, a flange 2c bent inward toward the inside of the door 2 is formed in the opening 2b of the door 2, as shown in Figure 4. As the opening 2b is formed in a square shape, flanges 2c can be formed on each of the four sides. Additionally, a fixing groove 114 is formed around the lower portion of the body member 110 in contact with the opening 2b. In particular, as the opening 2b is formed in a square shape, the lower part of the body member 110 in contact with the opening 2b also has a square cross-sectional structure, and the fixing groove 114 is formed at three of the four corners of the square cross-sectional structure. It can be formed at each corner. And, while the lower part of the body member 110 is inserted into the opening 2b of the door 2, the flange 2c is pressed on the inner surface of the door 2 and is coupled to the fixing groove 114 to form the body member ( A fixing pin 150 is provided to secure 110 to the door 2. This fixing pin 150 has an approximately 'ㄷ' shape so as to be coupled to the fixing grooves 114 at the three corners of the body member 110.

In addition to the above-described configuration, the following configuration may be added to secure the coupling stability of the lifting member 120, the operation button 130, and the latch 140 with respect to the body member 110.

First, a first pin insertion hole 115a is formed in the body member 110 at a position corresponding to the insertion position of the lifting member 120. In addition, the lifting member 120 is formed with a long vertical hole 126 in the longitudinal direction to maintain communication with the first pin insertion hole 115a during the lifting operation of the lifting member 120. And, by providing these first pin insertion holes 115a and the first pin 116a inserted into the vertical long hole 126, the lifting member 120 is coupled to the body member 110 to enable a lifting operation. .

Next, a second pin insertion hole 115b is formed in the body member 110 at a position corresponding to the insertion position of the operation button 130. In addition, the operation button 130 is formed with a coupling hole 136 that communicates with the second pin insertion hole 115b. And, by providing the second pin insertion hole 115b and the second pin 116b inserted into the coupling hole 136, the operation button 130 is tilted and rotated at a certain angle as shown in FIGS. 14 to 15. The operation button 130 is coupled to the body member 110 to enable this.

Next, a third pin insertion hole 115c is formed in the body member 110, and the latch 140 is in communication with the third pin insertion hole 115c when the latch 140 operates elastically in the longitudinal direction. A horizontal long hole 144 is formed long in the longitudinal direction of the catch 140 to maintain the. Then, with the latch 140 inserted into the latch operation hole 111 of the body member 110, the third pin 116c is inserted into the third pin insertion hole 115c and the horizontal long hole 144, thereby (140) can be operated in the longitudinal direction relative to the body member (110). Meanwhile, when the latch 140 is elastically operated against the frame 1 in the latch operating hole 111, the third elastic body 142 that provides elastic force is between the third pin 116c and the elastic body insertion portion 141. It is inserted. In addition, the third pin insertion hole 115c and the third pin 116c must be provided at positions that do not collide with the protrusion 122 of the lifting member 120 when the protrusion 122 is lifted and lowered.

<Operation of the embodiment>

First, Figures 1 and 14 show a state in which the door 2 of the ceiling inspection opening is locked to the frame 1 by the locking device of the present invention. In this state, both the lifting member 120 and the operating button 130 of the lock are completely inserted into the interior of the body member 110, and in particular, the lifting member 120 has a protrusion 122 in the raised position as shown in Figure 9. It is inserted into the protruding insertion hole 143 of the clasp 140 and is cross-coupled with the clasp 140. Accordingly, the latch 140 cannot move in the horizontal direction and the door 2 of the ceiling inspection opening cannot be opened from the frame 1, so that the door 2 is locked in a closed state.

Next, Figures 2 and 15 show the state when the operation button 130 is pressed. That is, when the pressing operation unit 131, especially the pressing marking unit 131a, is pressed with a finger or a hand tool, as shown by a white upward arrow, a pressing force is applied to the locking protrusion 132 located on an extension of the point of application of the pressing operation force. do. Then, the locking protrusion 132, which supports the protruding end 124 of the lifting member 120 from below and prevents the lowering of the lifting member 120, pushes the protruding end 124 upward, and at the same time, the body member 110 ) The inclined surface portion 135, which was in surface contact with the inclined block 112, slides along the inclined block 112 to form a gap with the inclined block 112. Then, as shown in FIG. 15, the operation button 130 is tilted in the opposite direction of the lifting member 120, and the protruding end 124 is separated from the locking protrusion 132. Accordingly, the lifting member 120 descends in the direction indicated by the black arrow in FIG. 15. Figure 2 shows the state at this time viewed from the outside of the ceiling inspection hole. In this state in which the lifting member 120 is lowered, the latch 140 can be moved in the horizontal direction as shown by the double-dashed arrow in FIG. 15, and the worker moves the handle portion 121 of the lifting member 120 in the direction of the black arrow. When pulled, the latch 140 moves in the direction of the two-dot chain arrow while hanging over the frame 1, allowing it to escape from the frame 1. Then, the door 2 is unlocked from the frame 1 and the door 2 can be opened as shown in FIG. 16. Figure 3 shows the door 2 opened as seen from the outside.

Meanwhile, in order to close the door (2) again and lock it, simply close the door (2) against the frame (1) as shown in Figure 2 and then press the handle portion (121) of the lifting member (120). . That is, when the door 2 is closed against the frame 1, the latch 140 is placed on the frame 1, and then when the handle 121 is pressed, the lifting member 120 rises as shown in FIG. 14 and forms a protrusion. (122) is inserted into the protruding insertion hole 143 of the clasp 140 and cross-linked again with the clasp 140. Then, the latch 140 cannot move in the horizontal direction and the door 2 cannot be opened from the frame 1, so that the door 2 is locked in a closed state.

In the above, the present invention has been described based on preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. This is possible.

1: Frame 2: Door
2a: Hinge 2b: Opening
2c: Flange 100: Locking device
110: body member 111: latch operating hole
112: Inclined block 113: Seating groove
114: fixing groove 115a: first pin insertion hole
115b: 2nd pin insertion hole 115c: 3rd pin insertion hole
116a: 1st pin 116b: 2nd pin
116c: Third pin 120: Elevating member
121: handle 122: protrusion
123: first elastic body 124: seating groove
125: protruding end 126: vertical long hole
130: operation button 131: push operation unit
131a: Press marking portion 132: Locking jaw
133: second elastic body 134: fitting groove
135: inclined surface portion 136: coupling hole
140: clasp 141: elastic body insertion portion
142: Third elastic body 143: Protrusion insertion hole
144: horizontal long hole 150: fixing pin

Claims (9)

A locking device for a door for a ceiling inspection door that is mounted on an opening provided in the door and locks or unlocks the door to the frame in a ceiling inspection door including a frame installed on the ceiling and a door that opens and closes against the frame. as,
A body member having a hollow structure coupled to the opening of the door, having a latch operation hole formed laterally at one end and an inclined block formed at the top of one inner side;
A handle portion that is inserted into the body member to be operable for lifting and lowering, the handle portion having one end exposed to the opening when the body member is coupled to the door, a protrusion extending in a direction intersecting the latch operation hole, and a A lifting member having a protruding end formed on a side and a first elastic body that emits elastic compression and restoring force along the extending direction of the protruding portion to enable the lifting operation.
A pressing operation part that is inserted into the interior of the body member while facing the lifting member and is exposed to the opening when the body member is coupled to the door, and supports the protruding end in the raised state of the lifting member and A locking protrusion that disengages the protruding end and causes the lifting member to descend when the pressing operation unit is pressed, a second elastic body that emits an elastic pressing force against the lifting member on the opposite side of the locking protrusion, and an inclined block of the body member; An operation button provided with an inclined surface portion that slides along the inclined block and forms a gap with the inclined block when the pressing operation portion is pressed during surface contact;
It is inserted and coupled to the latch operating hole of the body member so as to be elastically operable in the transverse direction relative to the frame, and is cross-coupled with the protrusion when the lifting member is in an elevated position, thereby locking the door to the frame. It is in a locked state, and when the lifting member is in the lowered position, it is separated from the protrusion and can be elastically operated against the frame in the latch operation hole, and includes a latch that unlocks the door with respect to the frame. Locking device for the ceiling access door.
In claim 1,
An inwardly bent flange is formed at the opening of the door, a fixing groove is formed around a lower part of the body member in contact with the opening, and the inner surface of the door is in a state where the lower part of the body member is inserted into the opening. A locking device for a ceiling inspection access door, characterized in that it is further provided with a fixing pin that is coupled to the fixing groove while pressing the flange from above and fixes the body member to the door.
In claim 2,
The body member has a lower portion in contact with the opening having a square cross-sectional structure, the fixing grooves are formed at three of the four corners of the square cross-sectional structure, and the fixing pins are coupled to the fixing grooves at the three corners. A locking device for a ceiling inspection door, characterized in that it is formed in a 'ㄷ' shape.
In claim 1,
A locking device for a door for a ceiling inspection access door, characterized in that the push operation part of the operation button is provided with a push mark at the point of application of the force that causes the locking protrusion to separate the protruding end during the push operation.
In claim 4,
A locking device for a door for a ceiling inspection opening, wherein the push mark portion has a protruding structure.
In claim 1,
A first pin insertion hole is formed in the body member, and a vertical long hole is formed in the lifting member to maintain communication with the first pin insertion hole during the lifting operation of the lifting member, and the first pin is inserted. A locking device for a door for a ceiling inspection access door, characterized in that it is provided with a ball and a first pin that is inserted into the vertical long hole and couples the lifting member to the body member to enable a lifting operation.
In claim 1,
A second pin insertion hole is formed in the body member, and a coupling hole communicating with the second pin insertion hole is formed in the operation button, and is inserted into the second pin insertion hole and the coupling hole to couple the operation button to the body member. A locking device for a door for a ceiling inspection opening, characterized in that it is provided with a second pin.
In claim 1,
A third pin insertion hole is formed in the body member, and a long horizontal long hole is formed in the latch in the longitudinal direction to maintain a state in communication with the third pin insertion hole when the latch operates elastically in the longitudinal direction. A ceiling characterized in that it is provided with a third pin that is inserted into the third pin insertion hole and the horizontal long hole in a state inserted into the latch operation hole of the body member and couples the latch to the body member to enable horizontal operation. Locking device for the inspection door.
In claim 8,
An elastic insertion portion is formed inside the latch in the longitudinal direction of the latch, and the elastic insertion portion is inserted between the third pin and the elastic insertion portion so that the latch is elastically operated against the frame in the latch operation hole. A locking device for a door for a ceiling inspection opening, characterized in that it is provided with a third elastic body that provides elastic force.

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