JP6407397B1 - Inspection opening / closing tool - Google Patents

Abstract

Provided is an inspection port opening / closing tool that can be applied to work at a high place and can safely open and close a door of an inspection port at a ceiling in a high place.
A first engaging member 13 of a door receiving member 4 of an opening / closing tool unit 3 and an engaging end 15a of a second engaging member of a door gripping member 5 during an operation of opening and closing a door 100 of an inspection port 201a. , 16a and holding the door 100 while maintaining the gripped state. In this state, the operation of closing the door 100 of the inspection port 201a can be performed by raising the operating rod 2 while supporting the door 100 from below.
[Selection] Figure 2

Description

  The present invention relates to an inspection port opening / closing tool that opens and closes a door of a ceiling inspection port, for example, when various wirings such as a wiring cable are laid in the back of a ceiling.

  When laying various types of wiring such as wiring cables in high places such as commercial facilities, for example, in the back of a ceiling of about 4 to 6 meters, open the door of the inspection port provided in a part of the ceiling and perform the work. ing. The operation of opening and closing the door of the inspection port at a high place is usually performed using a scaffold or a work platform at a high place. An open / close device that opens and closes an inspection door from the ground without using a scaffold or an aerial work platform has been developed. For example, as shown in Patent Document 1, there is an open / close device that uses two long and thin metallic operation bars.

JP 2017-145637 A

  However, in the above-described conventional opening / closing device, the door is supported while the door is inclined at an inclination angle of about 45 ° with respect to the ceiling during the opening / closing operation of the inspection port door, for example, during the operation of closing the door of the inspection port. The rotating pin of the mechanism may come off and the door may fall from the inspection port.

  The present invention has been made paying attention to the above circumstances, and its purpose is applicable to high-altitude work, and an inspection port that can safely open and close the door of a high-level ceiling inspection port. It is to provide an opening / closing tool.

  An inspection port opening / closing tool according to an aspect of the present invention is an inspection port opening / closing tool that opens and closes a door of an inspection port arranged on a ceiling. The inspection port includes a rotation support portion of a door that opens and closes the inspection port at a first end portion on one end side, and a lock pin that protrudes in the floor direction from the surface of the door at a second end portion on the other end side of the inspection port. Are arranged respectively. The lock pin of the locking mechanism having a locking plate that moves between a first position where the door can be released by rotation of the lock pin and a second position where the door is locked to the ceiling is rotated. And moves the locking plate selectively to the first position and the second position. The inspection port opening / closing tool includes an operation rod and an opening / closing tool unit. The operation rod extends toward the ceiling. The opening / closing tool unit is detachably connected to a distal end of the operation rod in the extending direction. Further, the opening / closing tool unit includes a door receiving member, a door gripping member, and a spring member. The door receiving member is provided at a distal end in the extending direction of the operation rod, receives the first contact member in contact with the door, and engages with the first end of the door in a detachable manner. Have The door gripping member is attached to the door receiving member, and is provided so as to be movable in a direction in which the door gripping member comes in contact with and separates from the first engagement member, and engages and disengages with the second end of the door. A second engaging member; Further, the spring member biases the second engagement member in a direction approaching the first engagement member. The door is gripped between the first engagement member and the second engagement member.

  Preferably, the door receiving member is formed of a transparent member.

  Preferably, the opening / closing tool unit has a lock pin operation mechanism that engages and disengages with the lock pin and rotates the lock pin.

  Preferably, the lock pin operating mechanism has a shaft body having a screwdriver at the tip of a second operation rod different from the operation rod, an inner diameter larger than the lock pin, and the shaft body A cylindrical cover member slidably inserted, and provided between the cover member and the second operating rod, and the cover member is connected to the second operating rod with respect to the second operating rod. A second spring member that biases in a direction from the proximal end on the operation rod side toward the distal end.

  It is possible to provide an inspection port opening / closing tool that can be applied to work at high places and can safely perform opening / closing operations of the doors of inspection openings on ceilings at high places.

FIG. 1 is a plan view of the entire inspection port opening / closing tool according to the embodiment. FIG. 2 is a plan view showing the back surface of the inspection port opening / closing tool of the embodiment. FIG. 3 is a plan view showing a door receiving member of the inspection port opening / closing tool according to the embodiment. FIG. 4 is a plan view illustrating a door gripping member of the inspection port opening / closing tool according to the embodiment. FIG. 5 is a perspective view illustrating a state in which the door receiving member and the door gripping member of the inspection opening / closing tool according to the embodiment are assembled. FIG. 6 is an explanatory view showing a structure of a general inspection door. FIG. 7 is a longitudinal sectional view showing a state in which a main part of the opening / closing device of FIG. 1 is cut. FIG. 8 is a longitudinal sectional view showing a state where the opening / closing device of FIG. 1 is operated. FIG. 9 is a perspective view illustrating a usage state of the inspection port opening / closing tool according to the embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the entire inspection port opening / closing tool according to the embodiment of the present invention. FIG. 2 is a plan view showing the back surface of the inspection port opening / closing tool of the embodiment. FIG. 3 is a plan view showing a door receiving member of the inspection port opening / closing tool according to the embodiment. FIG. 4 is a plan view illustrating a door gripping member of the inspection port opening / closing tool according to the embodiment. FIG. 5 is a perspective view illustrating a state in which the door receiving member and the door gripping member of the inspection opening / closing tool according to the embodiment are assembled. FIG. 6 is an explanatory view showing a structure of a general inspection door. FIG. 7 is a longitudinal sectional view showing a state in which a main part of the opening / closing device of FIG. 1 is cut. FIG. 8 is a longitudinal sectional view showing a state where the opening / closing device of FIG. 1 is operated. FIG. 9 is a perspective view showing a usage state of the inspection port opening / closing tool of the first embodiment.

  The inspection port opening / closing tool 1 of the present embodiment is used when opening and closing the door 100 of the inspection port 201a arranged on a part of the ceiling surface 201 of a high ceiling 200 such as a commercial facility as shown in FIG. Is done. Usually, the inspection port 201 a of the ceiling surface 201 is closed by the door 100.

  For example, the door 100 is fitted inside the inspection port 201a having a rectangular shape of about 50 cm square of the ceiling 200, in this embodiment, a square shape, and closes the inspection port 201a. The door 100 shows an example of a rectangular shape having substantially the same shape as the inspection port 201a, and in this embodiment, a square shape. In general, the door 100 is connected to the ceiling 200 via a hinge (rotation support portion) 300 provided on one side (first end portion 100a on one end side) of the inspection port 201a. The door 100 includes a locking mechanism 110 for the door 100 that opens and closes the inspection port 201a at an end side opposite to the side where the hinge 300 is provided (second end portion 100b on the other end side).

  The locking mechanism 110 includes a lock pin 112 that penetrates the door 100 in the thickness direction from the door surface 101 to the back surface (not shown), and a lock plate 114 that is fixed to the rear end of the lock pin 112 protruding to the back surface side of the door 100. have. For example, a linear groove 116 is provided at the front end of the lock pin 112 on the door surface 101 side. The groove 116 is provided for rotating the lock pin 112 using, for example, a flat-blade screwdriver. As shown in FIG. 6, the locking plate 114 is, for example, a rectangular plate. One end side of the locking plate 114 is fixed to the rear end of the lock pin 112.

  Next, the operation of the locking mechanism 110 will be described with reference to FIG. When the door 100 does not have the locking mechanism 110, the door 100 rotates in the gravity direction with the hinge 300 as a rotation center by its own weight. As a result, the door 100 hangs vertically with respect to the ceiling surface 201. The locking mechanism 110 is for maintaining the door 100 in a state parallel to the ceiling 200.

  The locking plate 114 of the locking mechanism 110 can be selectively moved to a first position 114a indicated by a dotted line and a second position 114b indicated by a one-dot chain line in FIG. 6 in conjunction with the rotation operation of the lock pin 112. . The locking plate 114 can be rotated 360 degrees around the lock pin 112.

  That is, the first position 114 a is a position where the rotation tip end portion of the locking plate 114 overlaps the door 100. In other words, when the locking plate 114 is in the first position 114a, the door 100 is not locked to the ceiling 200, that is, a so-called unlocked state. For this reason, the door 100 hangs down by gravity as described above, and the inspection port 201a is opened.

  On the other hand, the second position 114b is a position where the rotation tip of the locking plate 114 protrudes toward the ceiling 200 side. That is, when the locking plate 114 is in the second position 114b in a state where the door 100 is supported at a position parallel to the ceiling 200, the door 100 is locked by the edge 202 of the ceiling 200 and parallel to the ceiling 200. Held in a state (locked state). In this state, the inspection port 201a is blocked by the door 100.

  Next, the structure of the inspection port opening / closing tool 1 of this embodiment is demonstrated. The inspection port opening / closing tool 1 of the present embodiment includes an operation rod 2 and an opening / closing tool unit 3 as shown in FIG. The operation rod 2 is, for example, a rod-like member in which a plurality of cylindrical members are connected to be stretchable. The operation rod 2 can adjust the amount of expansion / contraction according to the height from the floor to the ceiling 200 where the door 100 is provided. The material of the operating rod 2 is preferably lightweight and has a certain degree of strength. As a material for the operation rod 2, for example, a resin material, FRP, or the like can be employed.

  In the present embodiment, the base end portion of the operation rod 2 is connected to a tripod (not shown), for example. The operation rod 2 is used by extending toward the ceiling 200 while being supported by a tripod. The tripod does not necessarily need to be used, and the user may directly grab it with the hand. A distal end member 2 a is provided at the distal end of the operation rod 2 in the extending direction. The distal end member 2a of the operation rod 2 is detachably connected to the opening / closing tool unit 3 via an attaching / detaching portion described later.

  The opening / closing tool unit 3 includes a door receiving member 4, a door gripping member 5, and a pair of spring members 6. As shown in FIG. 3, the door receiving member 4 has a rectangular frame shape, in this embodiment, a rectangular fixed frame 7, and a flat door receiving panel 8 fixed to the fixed frame 7. The fixed frame 7 is made of, for example, a lightweight metal material. The length of the fixing frame 7 in the longitudinal direction (left-right direction in FIG. 3) is the length between the first end 100a and the second end 100b of the door 100 of the inspection port 201a that is generally used. The length is set longer than this. The door receiving panel 8 is formed of, for example, a transparent resin material (transparent member).

  The fixed frame 7 is arranged vertically in FIG. 3 and a pair of first frames 9 and 10 extending in the longitudinal direction, and a pair of frames arranged in the right and left in FIG. 3 and extending in the short direction. Second frames 11 and 12. The first frames 9 and 10 also serve as guide rails for the door gripping member 5.

  Of the two second frames 11, 12, the second frame 11 on the left end side in FIG. 3 has a first engaging member 13 detachably engaged with the first end 100 a of the door 100. . The first engagement member 13 has a hook-shaped engagement end portion 13a obtained by bending a metal plate in an approximately L shape. The engagement end portion 13 a is engaged in a state of being hooked on a corner portion of the first end portion 100 a of the door 100. Moreover, the handle 14 of the opening / closing tool unit 3 is formed in the second frame 12 on the right end side in FIG.

  The door gripping member 5 is provided so as to be movable in the left-right direction in FIG. 1 in a state of being superimposed on the door receiving panel 8 of the door receiving member 4. As shown in FIG. 4, the door gripping member 5 includes a pair of linear guide members 15 and 16 and a movable panel 17 fixed between the guide members 15 and 16. The guide members 15 and 16 are made of, for example, a lightweight metal material. 4, the upper guide member 15 is supported so as to be movable along the guide rail of the upper first frame 9 in FIG. 4, the lower guide member 16 is supported so as to be movable along the guide rail of the lower first frame 10 in FIG. In addition, the movable panel 17 is formed of, for example, a transparent resin material (transparent member) and attached to the door receiving panel 8 so as to be overlapped.

  In the right end portion of the guide members 15 and 16 in FIG. 4, hook-like engagement end portions 15a and 16a obtained by bending a metal plate in an approximately L shape are provided. These engagement end portions 15 a and 16 a are bent in the same direction as the engagement end portion 13 a of the first engagement member 13. These engagement end portions 15a and 16a are engaged in a state of being hooked on the corner portion of the second end portion 100b of the door 100, and a second engagement member is formed by the engagement end portions 15a and 16a.

  The spring member 6 is formed by a tension spring that is a coil spring, for example. One end 6a of the spring member 6 is fixed to the second frame 11 on the left end side in FIG. The other end 6b of the spring member 6 is fixed to the left end portion of the movable panel 17 in FIG. The spring force of the spring member 6 biases the engagement end portions 15 a and 16 a of the second engagement member of the door gripping member 5 in a direction approaching the first engagement member 13. Thus, the door 100 is gripped between the first engagement member 13 of the door receiving member 4 and the engagement end portions 15 a and 16 a of the second engagement member of the door gripping member 5.

  Further, the door gripping member 5 of the opening / closing tool unit 3 is provided with a connecting portion 18 of the operation rod 2. The connecting portion 18 is provided with an insertion port 18 a for the operation rod 2. Then, with the distal end member 2a of the operating rod 2 inserted into the insertion opening 18a, the fixing knob (not shown) is rotated, so that the distal end member 2a of the operating rod 2 is attached to and detached from the opening / closing tool unit 3 with a fixing screw, for example. Connected as possible.

  In the present embodiment, a second operation bar (not shown) different from the operation bar 2 to which the opening / closing tool unit 3 is coupled is provided. The second operating rod is provided with a lock pin operating mechanism 19 shown in FIGS. The lock pin operation mechanism 19 includes a pin operation member 21 that rotates the lock pin 112 of the door 100. The pin operating member 21 has a rotating shaft body 22 that is rotatably connected to the second operating rod.

  The rotating shaft body 22 is arranged concentrically and has three stages of shaft portions (a large diameter portion 22a, an intermediate shaft portion 22b, and a tip shaft portion 22c) having different outer diameters. The large diameter portion 22a is disposed at the base end portion (lower side in FIGS. 7 and 8) of the rotating shaft body 22, and is the largest diameter shaft portion. The intermediate shaft portion 22b is a shaft portion that is disposed on the distal end side (the upper side in FIGS. 7 and 8) of the large diameter portion 22a and has a smaller diameter than the large diameter portion 22a. Therefore, a stepped portion 28 is formed between the large-diameter portion 22a and the intermediate shaft portion 22b and serves as a spring receiver described later.

  The distal end shaft portion 22c is disposed on the distal end side (the upper side in FIGS. 7 and 8) of the intermediate shaft portion 22b, and is a shaft portion having a smaller diameter than the intermediate shaft portion 22b. The rotating shaft body 22 is formed of, for example, an elongated metal rigid body. The distal end shaft portion 22c is provided with a screwdriver portion 23 that is detachably engaged with the lock pin 112 and that rotates the lock pin 112. The screwdriver 23 has a shape that fits into the groove 116 (see FIG. 6) of the pin 112 described above. In the present embodiment, the screw driver 23 has the same linear shape as the tip of the minus driver. As long as the pin 112 provided on the door 100 can be rotated, the shape of the screwdriver 23 is not limited to the shape of the tip of the minus driver.

  A cylindrical protective cover (cover member) 24 made of, for example, a transparent material is disposed on the outer peripheral portion of the rotating shaft body 22. The protective cover 24 has two cylindrical members (a first cylindrical body 25 and a second cylindrical body 26) that are arranged concentrically with the rotating shaft body 22. The 1st cylindrical body 25 is arrange | positioned in the position corresponding to the upper part of the intermediate shaft part 22b. A second spring member 27, which is a compression spring, is disposed on the outer peripheral surface on the lower side of the intermediate shaft portion 22b so as to be wound around the outer periphery of the intermediate shaft portion 22b. The second spring member 27 has an upper end in contact with the first cylindrical body 25 and a lower end in contact with the stepped portion 28 between the large diameter portion 22a and the intermediate shaft portion 22b. Thereby, the 2nd spring member 27 is mounted | worn between the lower end part of the 1st cylindrical body 25, and the level | step-difference part 28, and urges | biases the 1st cylindrical body 25 to the direction which goes to the upper side of the intermediate shaft part 22b.

  The upper end portion of the first cylindrical body 25 extends to the distal end shaft portion 22c side. A second cylindrical body 26 is attached to the upper outer peripheral surface of the first cylindrical body 25 so as to be movable in the axial direction of the rotary shaft body 22. The second cylindrical body 26 has a screw hole penetrating in the radial direction. A fixing screw 29 is screwed into the screw hole of the second cylindrical body 26. And the fixing position of the axial direction of the 2nd cylindrical body 26 with respect to the 1st cylindrical body 25 is adjusted to arbitrary positions with this fixing screw 29. FIG.

  The fixing position of the second cylindrical body 26 in the axial direction with respect to the first cylindrical body 25 can be adjusted according to the amount of protrusion of the lock pin 112 of the door 100 from the door surface 101. Preferably, the second cylindrical body 26 is fixed to the first cylindrical body 25 at a position where the distal end surface of the first cylindrical body 25 is recessed from the distal end surface of the second cylindrical body 26 by the protruding amount of the lock pin 112. As a result, the lock pin 112 can be inserted into the second cylindrical body 26 and functions as a guide for fitting the screwdriver 23 in the first cylindrical body 25 and the groove 116 of the lock pin 112. .

  The pin operating member 21 of the lock pin operating mechanism 19 is held at the standby position in FIG. 7 by the spring force of the second spring member 27 during standby. At this time, the screw driver 23 is held in a state of moving to the inner side of the first cylindrical body 25.

  Further, when the door 100 is opened and closed, the front end surface of the second cylindrical body 26 of the protective cover 24 is pressed against the door 100 of the ceiling 200 and presses the front end surface of the second cylindrical body 26 in the direction of the second operating rod. Axial pressing force is applied. At this time, as shown in FIG. 8, the protective cover 24 slides downward (the direction in which the second spring member 27 is compressed) against the urging force of the second spring member 27. Therefore, the screwdriver 23 protrudes from the tip surface of the first cylindrical body 25. The amount of movement of the screwdriver 23 varies depending on the amount of compression of the second spring member 27.

  On the other hand, when the front end surface of the second cylindrical body 26 is separated from the door 100, the above-described axial force is lost. Therefore, the protective cover 24 returns to the standby position shown in FIG. 7 by the restoring force of the second spring member 27.

  The protective cover 24 has a protective ring 30 made of an elastic member such as rubber at the upper end portion of the second cylindrical body 26 made of a transparent material, and has a mark portion 31 for positioning the screwdriver 23. It may be configured. For example, the alignment mark 31 for alignment is preferably formed by drawing a linear red line along the axial direction on the outer peripheral surface of the protective cover 24 formed of a transparent material.

  Next, the operation of the inspection port opening / closing tool 1 having the above configuration will be described. When the inspection port opening / closing tool 1 according to the present embodiment is used, first, the fixing knob is rotated while the tip member 2a of the operating rod 2 is inserted into the insertion port 18a of the connecting portion 18 of the opening / closing tool unit 3. Thus, the operation rod 2 and the opening / closing tool unit 3 are detachably connected. Further, if necessary, the operation rod 2 is supported by the tripod by connecting the base end portion of the operation rod 2 to the tripod.

  In this state, an operation of opening the door 100 of the inspection port 201a of the ceiling surface 201 of the ceiling 200 at a high place is performed. At the time of this work, the operation rod 2 having the opening / closing tool unit 3 attached at the tip is extended toward the door 100 of the ceiling 200. Subsequently, the door receiving member 4 is brought into contact with the door 100. In this state, the engagement end portion 13a of the first engagement member 13 of the fixed frame 7 is engaged with the first end portion 100a of the door 100 in a hooked state.

  Thereafter, the operation rod 2 is operated to move the door gripping member 5 away from the first engagement member 13 against the spring force of the spring member 6. Then, the engaging end portions 15 a and 16 a of the guide members 15 and 16 are engaged with each other while being hooked on the corner portion of the second end portion 100 b of the door 100. Accordingly, the door 100 is gripped between the first engagement member 13 of the door receiving member 4 and the engagement end portions 15 a and 16 a of the second engagement member of the door gripping member 5. In this state, the door 100 is held in a state of being supported from below via the operation rod 2 and the opening / closing tool unit 3.

  In this manner, with the door 100 supported from below via the operation rod 2 and the opening / closing tool unit 3, a lock pin operation mechanism 19 of a second operation rod (not shown) separate from the operation rod 2 is used. The door 100 is unlocked. When the door 100 is unlocked, the protective cover 24 of the pin operation member 21 is aligned toward the lock pin 112 of the door 100. At this time, the minus direction of the screwing portion 23 in the first cylindrical body 25 is aligned with the minus direction of the groove 116 of the lock pin 112 of the door 100 with reference to the red line of the mark portion 31 of the protective cover 24.

  Thereafter, with the screwdriver 23 in the first cylindrical body 25 engaged with the groove 116 of the lock pin 112, the lock pin operating mechanism 19 is moved counterclockwise in FIG. By rotating, the locking plate 114 of the locking mechanism 110 is moved to the first position 114a. Thereby, the door 100 is unlocked.

  Further, after unlocking the door 100, the operation rod 2 is slowly lowered while the door 100 is supported from below via the operation rod 2 and the opening / closing tool unit 3. At this time, the door 100 is gripped between the first engaging member 13 of the door receiving member 4 of the opening / closing tool unit 3 and the engaging end portions 15 a and 16 a of the second engaging member of the door gripping member 5. Is held by. Therefore, by slowly lowering the operating rod 2, the door 100 hangs down due to gravity as shown in FIG. In this state, the inspection port 201a is moved to a position where it opens. Finally, the operation rod 2 is pulled in a direction away from the door 100 at the opening position where the door 100 of the inspection port 201a is opened. By this operation, the state in which the door 100 is gripped between the first engaging member 13 of the door receiving member 4 and the engaging end portions 15a and 16a of the second engaging member of the door gripping member 5 is released. The opening / closing tool unit 3 is removed from the door 100. With the above operation, the door opening operation for opening the door 100 of the inspection port 201a is completed.

  Further, when the door 100 of the opened inspection port 201a is closed, the operation rod 2 having the opening / closing tool unit 3 attached to the tip is extended toward the lower end of the door 100 of the open ceiling 200. Subsequently, the door receiving member 4 of the opening / closing tool unit 3 is brought into contact with the door 100. In this state, the engagement end portion 13a of the first engagement member 13 of the fixed frame 7 is engaged with the first end portion 100a of the door 100 in a hooked state. Thereafter, the operation rod 2 is operated to move the door gripping member 5 away from the first engagement member 13 against the spring force of the spring member 6. Then, the engaging end portions 15 a and 16 a of the guide members 15 and 16 are engaged with each other while being hooked on the corner portion of the second end portion 100 b of the door 100. Accordingly, the door 100 is gripped between the first engagement member 13 of the door receiving member 4 and the engagement end portions 15 a and 16 a of the second engagement member of the door gripping member 5. In this state, the door 100 is held in a state of being supported from below via the operation rod 2 and the opening / closing tool unit 3.

  Subsequently, the door 100 is gripped between the first engagement member 13 of the door receiving member 4 of the opening / closing tool unit 3 and the engagement end portions 15a and 16a of the second engagement member of the door gripping member 5 (FIG. 9). While maintaining this state, the operating rod 2 is slowly raised. At this time, the operation rod 2 is lifted while supporting the door 100 from below, so that the door 100 is turned upward and closed.

  Thereafter, in a state where the door 100 is brought close to the position where the inspection port 201a of the ceiling 200 is closed, the lock operation of the door 100 is performed using a lock pin operation mechanism 19 of a second operation rod (not shown) different from the operation rod 2. Done. When the door 100 is locked, the protective cover 24 of the pin operation member 21 is aligned toward the lock pin 112 of the door 100 as in the unlocking operation. At this time, the minus direction of the screwing portion 23 in the first cylindrical body 25 is aligned with the minus direction of the groove 116 of the lock pin 112 of the door 100 with reference to the red line of the mark portion 31 of the protective cover 24.

  Thereafter, with the screwdriver 23 in the first cylindrical body 25 engaged with the groove 116 of the lock pin 112, the lock pin operating mechanism 19 is rotated clockwise in FIG. By rotating, the locking plate 114 of the locking mechanism 110 is moved to the second position 114b. Thereby, the door 100 is locked and locked. Finally, the opening / closing tool unit 3 is removed from the door 100 by lowering the operation rod 2. With the above operation, the door closing operation for closing the door 100 of the inspection port 201a is completed.

  In the inspection port opening / closing tool 1 of the present embodiment having the above-described configuration, the first engagement member 13 of the door receiving member 4 of the opening / closing tool unit 3 and the door gripping member 5 during the operation of opening and closing the door 100 of the inspection port 201a. The door 100 is held while being held between the engagement end portions 15a and 16a of the second engagement member. In this state, the operation of closing the door 100 of the inspection port 201a can be performed by raising the operating rod 2 while supporting the door 100 from below. Therefore, it is possible to prevent the door 100 from dropping from the inspection port 201a during the operation of closing the door 100 of the inspection port 201a. As a result, it is possible to provide the inspection port opening / closing tool 1 that can be applied to work at a high place and can safely open and close the door 100 of the inspection port 201a of the ceiling 200 at a high place.

  In addition, this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not deviate from the summary. Further, the embodiments may be implemented in combination as appropriate, and in that case, the combined effect can be obtained. Furthermore, the present invention includes various inventions, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and an effect can be obtained, the configuration from which the constituent requirements are deleted can be extracted as an invention.

  DESCRIPTION OF SYMBOLS 1 ... Inspection port opening / closing tool, 2 ... Operation rod, 2a ... Tip member, 3 ... Opening / closing tool unit, 4 ... Door receiving member, 5 ... Door holding member, 6 ... Spring member, 6a ... One end of a spring member, 6b ... Spring The other end of the member, 7 ... a fixed frame, 8 ... a door receiving panel, 9 ... a first frame, 10 ... a first frame, 11 ... a second frame, 12 ... a second frame, 13 ... a first engaging member, 13a ... Engagement end, 14 ... handle, 15 ... guide member, 15a ... engagement end (second engagement member), 16 ... guide member, 16a ... engagement end (second engagement member), 17 ... Moving panel, 18 ... connecting portion, 18a ... insertion port, 19 ... lock pin operating mechanism, 21 ... pin operating member, 22 ... rotating shaft, 22a ... large diameter portion, 22b ... intermediate shaft portion, 22c ... tip shaft portion, 23 ... Screwdriver, 24 ... Protective cover, 25 ... First cylinder, 26 ... Second cylinder, 27 ... Member, 28 ... Stepped portion, 29 ... Fixing screw, 30 ... Protection ring, 31 ... Marking portion, 100 ... Door, 100a ... First end, 100b ... Second end, 101 ... Door surface, 110 ... Locking mechanism 112 ... Lock pin, 114 ... Locking plate, 114a ... First position, 114b ... Second position, 116 ... Groove, 200 ... Ceiling, 201 ... Ceiling surface, 201a ... Inspection port, 202 ... Edge, 300 ... Hinge.

Claims (4)

A rotation support portion of a door that opens and closes the inspection port at a first end portion on one end side of the inspection port disposed on the ceiling, and a second end portion on the other end side of the inspection port from the surface of the door to the floor direction. Each protruding lock pin is arranged,
The lock pin of the locking mechanism having a locking plate that moves between a first position where the door can be released by rotation of the lock pin and a second position where the door is locked to the ceiling is rotated. An inspection port opening / closing tool that moves and selectively moves the locking plate to the first position and the second position,
An operating rod extending toward the ceiling;
An opening / closing tool unit that is detachably connected to a distal end of the operation rod in the extending direction,
The opening / closing tool unit is provided at a distal end in the extending direction of the operation rod, receives the first operating member in contact with the door, and engages with the first end of the door in a detachable manner. A door receiving member having
A second engagement member that is attached to the door receiving member and that is movably provided in a direction to move toward and away from the first engagement member, and detachably engages with the second end portion of the door. A door gripping member having
A spring member for biasing the second engagement member in a direction approaching the first engagement member,
An inspection port opening / closing tool for gripping the door between the first engagement member and the second engagement member.   The inspection port opening / closing tool according to claim 1, wherein the door receiving member is formed of a transparent member.   The inspection port opening / closing tool according to claim 1, wherein the opening / closing tool unit includes a lock pin operating mechanism that is detachably engaged with the lock pin and that rotates the lock pin. The lock pin operating mechanism is
A shaft having a screwdriver at the tip of a second operation rod different from the operation rod;
A cylindrical cover member having an inner diameter larger than that of the lock pin and slidably inserted through the shaft body;
A direction that is provided between the cover member and the second operation rod and that moves the cover member from the proximal end of the shaft body on the second operation rod side to the distal end with respect to the second operation rod. The inspection port opening / closing tool according to claim 3, further comprising: a second spring member that biases the spring.