JP4832972B2 - Hidden hinge structure and installation method - Google Patents

Description

  The present invention relates to a structure of a hidden hinge that connects the door frame and the door so that the door can be freely opened and closed, and a method of attaching the hidden hinge. Specifically, the structure of the hidden hinge that can be easily attached to and removed from the door frame. Regarding technology.

  Conventionally, the description of Patent Document 1 is known as a hidden hinge. According to Patent Document 1, as shown in FIG. 11, the hidden hinge 40 has two sets of connecting arms 43 that connect the door frame 41 and the door 42 so as to be openable and closable. The adjustment blocks 47 and 47 are fixed to the accommodating portions 41a and 42a formed in the door frame 41 and the door 42 by a fixing screw 50 via a pair of casings 44 and 45, respectively.

  Each of the connecting arms 43 is a link member having the same configuration having a substantially “C” or “<” shape in plan view, which is paired on the left and right sides, and is hinged so as to be able to rotate around the vertical rotation shaft 46 while shifting the position in the vertical direction. Is done.

One end of the connecting arm 43 can be rotated by a pin support portion (not shown), and the other end 48 is formed by a slide shaft (not shown) slidingly moving an upper and lower end portion in a groove groove 49 provided in the adjustment block 47. The door 42 can be opened and closed.
Japanese Patent Laid-Open No. 06-288139

  However, in the above-described conventional example, when the door 42 is attached to the door frame 41, the door 42 is heavy and large, so that the operation becomes unstable, so that there is a problem that one person's work is unsafe and impossible.

  For this reason, there is a problem in that work efficiency is poor because a plurality of workers are required to screw in and remove the fixing screw 50 in a state where the door 42 is supported.

  Therefore, the present invention has been made in view of the problems of the related art, and provides a structure of a hidden hinge and a method of attaching the hidden hinge that can be safely performed by one person when attaching the door to the door frame. Objective.

According to the first aspect of the present invention, two sets of connecting arms that connect the door frame and the door so as to be openable and closable are connected to a vertical rotating shaft and housed in a pair of adjustment blocks. Is a slide support portion, and the pin support portions and slide support portions of the two sets of connecting arms are attached to each of the adjustment blocks as a pair, and the pair of adjustment blocks are assembled into a pair of hinge casings having a flange portion. A concealed hinge structure attached to a door frame and a housing provided on the door, wherein the adjustment block has a claw for preventing the adjustment block from falling off at least at the lower end of the hinge casing in the vertical direction. And provided with an engaging portion that engages with the claw portion at an end corresponding to the claw portion of the adjustment block of the door frame , the claw portion is a leaf spring, and the engaging portion is an end of the adjustment block. Is a protrusion formed on the part It is characterized in that.

The invention of claim 2 is the structure of the concealed hinge according to claim 1, wherein the claw portion is formed by bending the strip material at an obtuse angle to form a base portion and an opposite portion, and the base portion is formed in the longitudinal direction of the strip material. The length ratio of the base portion and the warped portion is fixed vertically with a fixing tool such as a screw through the elongated hole so that the warped portion is in a horizontal state due to rotation by its own weight in the loosened state. It is characterized by being set .

According to a third aspect of the present invention, two sets of connecting arms that connect the door frame and the door so as to be openable and closable are connected to a vertical rotating shaft and housed in a pair of adjustment blocks, and one end of the connecting arm is a pin support portion and the other end Is a slide support portion, and the pin support portions and slide support portions of the two sets of connecting arms are attached to each of the adjustment blocks as a pair, and the pair of adjustment blocks are assembled into a pair of hinge casings having a flange portion. A concealed hinge structure attached to a door frame and a housing provided on the door, wherein the adjustment block has a claw for preventing the adjustment block from falling off at least at the lower end of the hinge casing in the vertical direction. And an engaging portion that engages with the claw portion at an end corresponding to the claw portion of the adjustment block of the door frame, and the claw portion is bent at an obtuse angle to form a portion opposite to the base portion. The base is the belt It is fixed vertically with a fixing tool such as a screw through a long hole formed in the longitudinal direction of the material, and in a state where the fixing tool is loosened, the warped part is opposed to the base part so as to be in a horizontal state by rotation due to its own weight. It is characterized in that the length ratio of the part is set.

  According to the invention of claim 4, two sets of connecting arms that connect the door frame and the door so as to be freely opened and closed are connected to a vertical rotating shaft and housed in a pair of adjustment blocks. In the slide support, the pin support portions and the slide support portions of the two sets of connecting arms are attached to each adjustment block as a pair, and the pair of adjustment blocks are incorporated in a pair of hinge casings and provided on the door frame and the door. A method of attaching a concealed hinge that is attached to a receiving portion, wherein the hinge casing of the door frame is fixed to a lower end portion in the vertical direction with a claw portion for preventing the adjustment block from falling off with a fixing tool such as a screw. After attaching the door to the door frame, the adjustment block having a locking portion at the end corresponding to the claw portion of the door adjustment block is assembled in the hinge casing, and the door is attached to the door frame. On the nail After locking the door locking part and temporarily attaching it, the door frame adjustment block is permanently fixed to the hinge casing with a fixing tool such as a screw, and the door frame adjustment block is removed from the hinge casing. The claw portion is bent at an obtuse angle to form a base portion and a portion opposite to the base portion, and the base portion is fixed vertically with a fixing tool such as a screw through a long hole formed in the longitudinal direction of the band shape material, The length ratio of the base part and the warping part is set so that the warping part is in a horizontal state due to rotation by its own weight in a state where the fixing tool is loosened, so the adjustment block of the door frame and the hinge casing are attached to the fixing tool. After removing and temporarily fixing, the fixing tool of the claw part is loosened and the warped part is brought into a horizontal state so that the locking part of the door frame is detached from the claw part. Characterized by being removed from the hinge casing There.

  According to the first aspect of the present invention, there is provided a concealed hinge structure in which the pair of adjustment blocks are assembled into a pair of hinge casings having a collar portion and attached to a door frame and a housing portion provided on the door, A claw portion for preventing the adjustment block from falling off is provided on at least the lower end in the vertical direction of the hinge casing of the door frame, and the claw portion is provided at an end corresponding to the claw portion of the adjustment block of the door frame. A locking portion for locking is provided.

  Here, when carrying out the mounting operation of the door, in the state where one of the pair of adjustment blocks connected to the door housing portion by a connecting arm is incorporated in the hinge casing in advance. When it reaches the door frame with only the hinge casing attached, the locking part of the adjustment block of the inserted door frame is automatically locked to the claw part, and the adjustment block of the door frame is temporarily fixed. it can.

  For this reason, when attaching a door to a door frame, it can carry out safely by one person work and work efficiency improves. Note that the work of finally fixing the adjustment block of the door frame to the hinge casing is an operation in the state where the door is already temporarily fixed to the door frame, and can be safely and easily performed by one person.

In addition, according to the first aspect of the present invention, since the claw portion is a leaf spring, the locking portion can be reliably locked by its elasticity. Moreover, since the said latching | locking part is a protrusion provided in the edge part of the said adjustment block, a structure is simple. For this reason, there is no cost increase.

According to invention of Claim 2, 3, the said nail | claw part bends a strip | belt-shaped material to an obtuse angle, and a base part and a warp part are formed, and the said warp part is a horizontal state by rotation by dead weight in the state which loosened the said fixing tool. Since the length ratio of the base portion and the opposite portion is set so as to be, the claw portion can be brought into a state where it is not locked to the locking portion in a state where the fixing tool is loosened.

  For this reason, in a state in which the fixing block that permanently fixes the adjustment block of the door frame and the hinge casing is removed, the adjustment block of the door frame can be detached from the hinge casing by one person by simply loosening the fixing tool of the claw portion. It can be easily removed.

<Embodiment of the present invention>
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

<Structure of hidden hinge structure>
As shown in FIGS. 1 (a) and 1 (b), the structure of the hidden hinge 1 in the embodiment of the present invention is a combination of two sets of “C” -shaped cross sections that connect the door frame 2 and the door 3 so as to be freely opened and closed. The arms 4 a and 4 b are connected to the vertical rotation shaft 5 and are accommodated in a pair of adjustment blocks 6 a for the door frame 2 and an adjustment block 6 b for the door 3. Each of the connecting arms 4a and 4b includes a rotation shaft 7 as a pin support portion at one end S and a slide shaft 8 as a slide support portion at the other end T.

  Now, with the door 3 fully opened, the left and right directions are the X axis, the vertical (vertical) direction is the Y axis, and the axes perpendicular to the X and Y axes are the Z axis (front direction) toward the adjustment blocks 6a and 6b. And

  A pair of rotating shafts 7 and slide shafts 8 of the two sets of connecting arms 4a and 4b are attached to each of the adjustment blocks 6a and 6b. The pair of adjustment blocks 6a and 6b are assembled in a pair of hinge casings 1a and 1b each having a flange portion Q at the lower end and the lower end, and are attached to the accommodating portions 2a and 3a provided on the door frame 2 and the door 3. It is done.

  Here, the adjustment block 6b of the hinge casing 1b has a structure partially protruding from the bottom. However, the hinge casing 1a and the hinge casing 1b are structures of the same shape in which the bottom 31 is partially opened so that the hinge casings 1a and 1b can be shared. For this reason, it is preferable to block the gap etc. which generate | occur | produces on the back side of the hidden hinge 1 with resin etc. so that the internal surface of accommodating part 2a, 3a cannot be directly seen from the outside.

  A claw portion 9 made of a leaf spring for preventing the adjustment block 6a from falling off is provided at the flange portion Q at the lower end portion of the hinge casing 1a of the door frame 2 in the vertical direction. And the latching | locking part 10 of the protrusion latched with the nail | claw part 9 is provided in the lower end part of the adjustment block 6a of the door frame 2 corresponding to the nail | claw part 9. FIG.

  As shown in FIGS. 1 (a) to 2 (a) and 2 (b), each of the two sets of connecting arms 4a and 4b is closed from a state where the door 3 is opened to a state where it is half-opened. 1, the one end S is pin-supported by the rotating shaft 7 and rotates around the vertical rotating shaft 5, and the other end T moves while the slide shaft 8 is slidably supported by the upper and lower slide rails 13, 14. .

  Further, a more detailed description of the hidden hinge 1 will be described along the assembly procedure. As shown in FIGS. 3A and 3B, openings 12a and 12b penetrating in the Y-axis direction are formed in the adjustment block 6a for the door frame 2 and the adjustment block 6b for the door 3, and this opening 12a. , 12b are respectively mounted with slide rails 13, 14 formed separately from the adjusting blocks 6a, 6b.

  The slide rails 13 and 14 have a rectangular parallelepiped shape and are perpendicular to the adjustment blocks 6a and 6b and attached in the Z-axis direction. The slide rails 13 and 14 are formed with concave groove rail portions 13a and 14a having a rectangular cross section. The concave groove rail portions 13a and 14a are linear and have an angle α in the X-axis direction with respect to the Z axis of the slide rails 13 and 14. Inclined so as to face each other. This inclination can cope with the case where the depths of the accommodating portions 2a and 3a of the door frame 2 and the door 3 are narrow, for example, limited to 24 mm.

  Locking portions 15 are formed on the surfaces 13b and 14b of the slide rails 13 and 14 opposite to the grooved rail portions 13a and 14a. The locking portion 15 has a U-shaped cross section and includes protrusions 15b on both side surfaces 15a protruding from the surfaces 13b and 14b.

  Rectangular holes 16 are formed in the upper and lower portions of the adjustment blocks 6a and 6b. The size of the hole 16 is such that both side surfaces 15a of the protrusion 15b can be inserted in a natural state.

  For this reason, after the protrusion 15b is inserted into the hole 16 with the gap between the side surfaces 15a being narrowed, the protrusion 15b is locked to the edge of the hole 16 by returning the both side surfaces 15a to the original position. Thereby, the slide rails 13 and 14 are fixed to the adjustment blocks 6a and 6b.

  A pair of elongated holes 20 for attaching the adjustment block 6a to the hinge casing 1a so as to be adjustable left and right are provided above and below the adjustment block 6a, and the adjustment block 6b is adjusted in the front direction with respect to the hinge casing 1b above and below the adjustment block 6b. Screw holes 21 are provided for possible attachment. Convex locking portions 10 are formed at the upper and lower ends of the adjustment block 6a.

  The hinge casings 1a and 1b, the adjustment blocks 6a and 6b, and the connecting arms 4a and 4b are made of an aluminum die-cast material. The vertical rotation shaft 5 and the slide shaft 8 are made of stainless steel, and the slide rails 13 and 14 are made of resin molding.

  As shown in FIG. 4, the set of connecting arms 4a includes a shaft hole 7a for inserting the rotating shaft 7 at one end S, a shaft hole 8a for inserting the slide shaft 8 at the other end T, and a substantially central position. A shaft hole 5a for inserting the vertical rotation shaft 5 into the part is provided.

  Then, the connecting arm 4a is housed in the adjustment block 6a as indicated by an arrow, and the slide shaft 8 is inserted into the shaft hole 8a at the other end T. At this time, the upper end of the connecting arm 4a is inserted with the arm reinforcing plate 18 having the same shape as the cross-sectional shape of the connecting arm 4a.

  The arm reinforcing plate 18 includes a pair of holes 18a, and a pair of convex portions 18b at the upper end of the connecting arm 4a. Due to the engagement between the hole 18a and the convex portion 18b, the arm reinforcing plate 18 can be prevented from being displaced from the connecting arm 4a. Further, a set screw 19 for fixing the vertical rotating shaft 5 is screwed into the shaft hole 5a.

  The purpose of the arm reinforcing plate 18 is that the connecting arm 4a is brittle because of the aluminum die-cast material, and the longitudinal length of the shaft hole 5a, shaft hole 7a, and shaft hole 8a is long, so that the opening and closing operation is being performed due to the load of the door. In addition, a squeaking noise is generated due to contact with each shaft, and the connecting arm 4a may be chipped or broken.

  For this reason, the arm reinforcing plate 18 is formed of stainless steel, and the shaft holes formed in the arm reinforcing plate 18 are slightly smaller than the diameters of the shaft hole 5a, the shaft hole 7a, and the shaft hole 8a. Safety can be improved because the load can be directly handled.

  Next, the other set of connecting arms 4b will be described in the adjusting block 6b with reference to FIG. 5, but the same components as those shown in FIG. The description that has been made will be omitted. The connecting arm 4a and the connecting arm 4b have the same shape.

  As shown in FIG. 5, the connecting arm 4b is inverted upside down from the connecting arm 4a and stored in the adjustment block 6b as indicated by an arrow. In addition, an arm reinforcing plate 18 is attached to the lower end of the connecting arm 4b.

  As shown in FIG. The vertical rotating shaft 5 is inserted into the shaft hole 5a at the substantially central portion of each of the connecting arms 4a and 4b and fixed to the set screw 19 so that the connecting arms 4a and 4b are rotatably connected.

  Further, the adjustment block 6b is fixed in the hinge casing 1b on the door 3 side, and the hinge casing 1b is fixed in the accommodating portion 3a of the door 3 with a fixing tool 30 such as a screw through the hole 26.

  Here, the left and right adjustment screws 25 are screwed into the upper and lower screw holes 21 of the adjustment block 6b, and the front ends of the left and right adjustment screws 25 are rotatably fixed by the hinge casing 1b and a not-shown caulking stop. For this reason, the position adjustment of the left-right direction of the door 3 can be performed by adjusting the screwing allowance of the upper and lower left-right adjustment screws 25.

  As shown in FIG. 7, the hinge casing 1 a is assembled to the door frame 2 alone in advance in the accommodating portion 2 a of the door frame 2 with a fixing tool 30 such as a screw through the hole 26. The claw portion 9 for preventing the locking portion 10 of the adjustment block 6a from falling off is attached to the claw attachment portion 11 by the screw 27 through the long hole 28 on the flange portion Q at the lower end portion of the hinge casing 1a. .

  In the claw attaching portion 11, a digging 11a for regulating the claw portion 9 is formed in the Y-axis and Z-axis directions so that the claw portion 9 does not shift in the lateral (X-axis) direction.

  As shown in FIG. 8, the hinge casing 1 a is separately assembled in advance on the door frame 2 side, and the parts excluding the hinge casing 1 a from the hidden hinge 1 are assembled on the door 3 side. Then, with the hinge 1 opened 180 degrees, the door 3 is inserted into the door frame 2 as indicated by an arrow.

  As shown in FIGS. 9 (a) and 9 (b), the claw portion 9 for preventing the locking portion 10 of the adjustment block 6a from falling off at the flange portion Q at the lower end portion of the hinge casing 1a has its tip 9e hinged. It is provided so as to jump out to the inside of the casing 1a. For this reason, the locking part 10 of the inserted adjustment block 6a is temporarily fixed by getting over the tip 9e of the claw part 9 of the hinge casing 1a. After the temporary attachment, the adjustment block 6a of the door frame 2 can be permanently fixed to the hinge casing 1a through the long hole 20 with the fixture 20a.

  As shown in FIGS. 10 (a) and 10 (b), the claw portion 9 is formed by bending the belt-like material at an obtuse angle of 120 degrees and a base portion 9a having a length N and a warping portion 9b having a length L at an inclination angle θ from a horizontal plane. Then, a long hole 28 for the screw 27 is formed with a length N1 from the bend line 9c of the base portion 9a and the opposite portion 9b to the end portion 9d of the base portion 9a.

  Here, conditions for the warped portion 9b of the claw portion 9 to definitely rotate naturally and become horizontal are obtained with reference to FIG. Assuming that the weight per unit of the claw portion 9 is w, the moment around the bending line 9c needs to be M1 / M2> 1, since the moment M1 of the warped portion> the moment M2 of the base portion is a necessary condition.

M1 = (L × / 2) × (L × w), and M2 = (N × sin θ / 2) × (N × w). Here, since θ = 30 degrees,
M1 / M2 = (L × / 2) × (L × w) / {(N × sin θ / 2) × (N × w)}
= The ^{L 2 / (1/2) N 2} .

  Therefore, L> (N / √2) is sufficient. For example, if L = N = 7 mm, the warped portion 9b sufficiently rotates naturally and becomes horizontal. The length N1 of the long hole 28 is set larger than the diameter of the screw 27 so that the screw 27 is not obstructed by the long hole 28 during rotation.

<Operation of the structure of the hidden hinge>
The door 3 is attached by inserting the adjustment block 6b into the housing 3a of the door 3 into the hinge casing 1b and inserting it into the door frame 2 with only the hinge casing 1a attached. The locking portion 10 of the adjustment block 6a of the door frame 2 thus formed is automatically locked to the claw portion 9, and the adjustment block 6a can be easily temporarily fixed.

  At this time, since the base portion 9a of the claw portion 9 of the leaf spring is fixed by the screw 27 in a vertical state, the locking portion 10 of the adjustment block 6a is elastically returned after being inserted while pushing down the portion 9b. The adjustment block 6a can be temporarily fixed stably by the warping portion 9b.

  This work improves the work efficiency because it can be safely carried out by one person when attaching the door to the door frame. Finally, the door frame adjustment block 6a is permanently fixed to the hinge casing 1a. Since this operation is already performed with the door temporarily fixed to the door frame, it can be easily and safely performed by one person.

  Further, when the adjustment block 6a fixed to the door 3 is removed from the door frame 2, the claw portion 9 can be freely rotated by the long hole 28 of the base portion 9a only by loosening the screw 27, so that the warped portion 9b is naturally rotated. And become horizontal. For this reason, it is possible to safely and easily remove the adjustment block 6a from the hinge casing 1a together with the door 3 by one person.

  As mentioned above, although embodiment of this invention was described based on drawing, all said Example shows an example of this invention, and it cannot be overemphasized that this invention should not be limited to these.

  For example, you may equip the latching part 10 in the upper end part and lower end part of the nail | claw part 9 and the adjustment block 6a at the upper end part and lower end part of the hinge casing 1a of the door frame 2 of the orthogonal | vertical direction. In this case, the procedure for removing the door 3 is that the claw 9 at the upper end of the door frame is not horizontally leveled even if the screw 27 is loosened. The adjustment block 6a can be safely removed by one person from the hinge casing 1a by performing the above operation with the claw part 9 remaining in the part.

The structure of the hidden hinge 1 attached to the accommodating part 2a of the door frame 2 and the accommodating part 3a of the door 3 in embodiment of this invention is shown, (a) is a top view, (b) is a front view. In the embodiment of the present invention, a state of the hidden hinge 1 is shown, (a) is a plan view of the state in which the door 3 is opened approximately 90 degrees, (b) is a plan view of the state in which the door 3 is closed. In embodiment of this invention, (a) is a perspective view which shows the state of the adjustment block 6a for door frames 2, (b) is a perspective view which shows the state of the adjustment block 6b for doors 3. FIG. It is a disassembled perspective view which shows the state in which the connection arm 4a for the door frames 2 is accommodated in the adjustment block 6a in embodiment of this invention. It is a disassembled perspective view which shows the state in which the connection arm 4b for the doors 3 is accommodated in the adjustment block 6b in embodiment of this invention. FIG. 4 is a perspective view showing a state in which connecting arms 4a and 4b are connected by a vertical rotating shaft 5 and an adjustment block 6b is fixed in the hinge casing 1b on the door 3 side in the embodiment of the present invention. It is a perspective view which shows the state of the hinge casing 1a for the door frames 2 in embodiment of this invention. FIG. 6 is a cross-sectional plan view showing a state in which the adjustment block 6b is moved in the state where the adjustment block 6b is fixed in the hinge casing 1b and the adjustment block 6a is inserted into the hinge casing 1a for the door frame 2 in the embodiment of the present invention. is there. In embodiment of this invention, (a) is sectional drawing which shows the state of the nail | claw part 9 of the hinge casing 1a, (b) is a cross section which shows the state by which the latching | locking part 10 of the adjustment block 6a was temporarily fixed to the nail | claw part 9. FIG. The state of the nail | claw part 9 in embodiment of this invention is shown, (a) is a side view, (b) is an AA arrow line view of Fig.10 (a), (c) is the curvature part 9b of the nail | claw part 9. It is a side view which shows a horizontal state. It is a perspective view which shows the attachment state of the hidden hinge 40 in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hidden hinge 1a Hinge casing 1b Hinge casing 2 Door frame 3 Door 4a Connection arm 4b Connection arm 5 Vertical rotating shaft 6a Adjustment block 6b Adjustment block 7 Rotating shaft 8 Slide shaft 9 Claw part 10 Locking part S One end T Other end

Claims (4)

Two sets of connecting arms that connect the door frame and the door so as to be openable and closable are connected to a vertical rotation shaft and housed in a pair of adjustment blocks. The connecting arm has one end supporting a pin and the other end a slide supporting. A pair of pin support portions and slide support portions of each of the two sets of connecting arms are attached to each adjustment block as a pair, and the pair of adjustment blocks are installed in a pair of hinge casings having flanges and provided on the door frame and the door. A concealed hinge structure attached to the housing,
A claw portion for preventing the adjustment block from falling off is provided at the flange portion at least in the vertical direction of the hinge casing of the door frame, and the claw portion is provided at an end portion corresponding to the claw portion of the adjustment block of the door frame. equipped with a locking portion for engaging with,
The concealed hinge structure is characterized in that the claw portion is a leaf spring and the locking portion is a protrusion formed at an end of the adjustment block . It is a structure of the hidden hinge of Claim 1, Comprising: The said nail | claw part bends a strip | belt-shaped material to an obtuse angle, and a base part and the opposite part are formed, and the said base part passes through the long hole formed in the longitudinal direction of the said strip | belt-shaped material. The length ratio of the base portion and the warped portion is set so that the warped portion is in a horizontal state by rotation due to its own weight when the fastener is loosened and the warped portion is loosened. Hidden hinge structure. Two sets of connecting arms that connect the door frame and the door so as to be openable and closable are connected to a vertical rotation shaft and housed in a pair of adjustment blocks. The connecting arm has one end supporting a pin and the other end a slide supporting. A pair of pin support portions and slide support portions of each of the two sets of connecting arms are attached to each adjustment block as a pair, and the pair of adjustment blocks are installed in a pair of hinge casings having flanges and provided on the door frame and the door. A concealed hinge structure attached to the housing,
A claw portion for preventing the adjustment block from falling off is provided at the flange portion at least in the vertical direction of the hinge casing of the door frame, and the claw portion is provided at an end portion corresponding to the claw portion of the adjustment block of the door frame. With a locking part that locks with
The claw portion is bent at an obtuse angle to form a base and a portion opposite to the base, and the base is fixed vertically with a fixing tool such as a screw through a long hole formed in the longitudinal direction of the band, and the fixing A structure of a hidden hinge, wherein a length ratio of the base portion and the warped portion is set so that the warped portion is in a horizontal state by rotation due to its own weight when the tool is loosened. Two sets of connecting arms that connect the door frame and the door so as to be openable and closable are connected to a vertical rotation shaft and housed in a pair of adjustment blocks. The connecting arm has one end supporting a pin and the other end a slide supporting. A pair of pin support portions and slide support portions of the two sets of connecting arms are attached to each adjustment block as a pair, and the pair of adjustment blocks are attached to a pair of hinge casings and attached to a housing portion provided on the door frame and the door. A concealed hinge mounting method comprising:
After the hinge casing of the door frame is attached to the door frame in a state where a claw portion for preventing the adjustment block from falling off is fixed to the lower end of the adjustment block with a fixing tool such as a screw, the adjustment block of the door The adjustment block having a locking portion at an end corresponding to the claw portion is assembled in the hinge casing, and the door is temporarily locked to the claw portion of the door frame by locking the locking portion of the door. After fixing, the door frame adjustment block is permanently fixed to the hinge casing with a fixing tool such as a screw.
When removing the door frame adjustment block from the hinge casing,
The claw part is bent at an obtuse angle to form a base and an opposite part, and the base is fixed with a fixing tool such as a screw vertically through a long hole formed in the longitudinal direction of the band. Since the length ratio of the base portion and the warped portion is set so that the warped portion is in a horizontal state by rotation due to its own weight in a loosened state,
The door frame adjustment block and hinge casing are temporarily fixed by removing the fixing tool, and then the fixing part of the claw part is loosened to bring the warping part into a horizontal state, thereby adjusting the door frame. The method for attaching a hidden hinge, wherein the block is configured such that the locking portion is detached from the claw portion and is removed from the hinge casing.

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