Lock mechanism and fitting

Abstract

To provide a lock mechanism having a reduced number of parts, which allows the cost of parts and man-hours for installation to be reduced.SOLUTION: The lock mechanism of a fitting comprises a body part having an arm to be engaged with a part of a sash of the fitting, a lever handle, and a handle pedestal. A support part for supporting the shaft portion of the lever handle is insertable only at a specified angle to a hole part formed in the handle pedestal. The hole part is provided with a protrusion for restricting the insertion of the support part at angles other than the specified angle. The support part is provided with a non-intervention part at a position corresponding to the protrusion at a specified angle.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present disclosure relates to a locking mechanism.

Background Art

[0002] Conventionally, as a fitting such as a vertical sliding window or a horizontal sliding window, there is known one including a frame body, a shoji screen that is openably and closably housed in the frame body, an operation handle for opening and closing the shoji screen, and a locking mechanism for locking the shoji screen.

[0003] For example, as a fitting capable of suppressing the lifting of the auxiliary lock and facilitating the removal of the handle member, the auxiliary lock is arranged in a mounting hole provided in one of the frame body and the stile, and has a base portion, a locking portion, and a handle capable of operating the locking portion (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technique disclosed in Patent Document 1 attaches the handle member to the frame body via an attachment. In order to make the handle member difficult to come off and fill the gap, it has been a conventional method to insert and fix an O-ring, a washer, an E-ring, etc. to the handle shaft portion. However, in the above configuration, there are problems that the number of parts increases, the part cost increases, and the man-hours for attaching the locking mechanism increase.

[0006] The present disclosure has been made in view of the above, and an object thereof is to provide a locking mechanism capable of reducing the part cost and the man-hours at the time of attachment by reducing the number of parts.

Means for Solving the Problem

[0007] The present disclosure relates to a lock mechanism for a fitting, which has a main body portion including an arm that engages with a part of a shoji screen of the fitting, a handle lever, and a handle pedestal. A support portion that supports a shaft portion of the handle lever can be inserted only at a predetermined angle into a hole portion formed in the handle pedestal. The hole portion is provided with a convex portion that restricts insertion of the support portion at an angle other than the predetermined angle, and the support portion is provided with a non-interference portion at a position corresponding to the convex portion at the predetermined angle.

Brief Description of the Drawings

[0008]

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MODE FOR CARRYING OUT THE INVENTION

[0009] [First Embodiment] Figures 1 and 2 are perspective views of a sliding window 100 as a fitting in which a sub-block 1 as a lock mechanism of the first embodiment is used. Figure 1 shows the closed state of the sliding window, and Figure 2 shows the open state of the sliding window. In the following description, the depth direction is the direction along the depth of the fitting, and the front side in Figures 1 and 2 may be described as the indoor side, and the back side as the outdoor side. A plane along the depth direction may be described as a depth plane. The finding direction is the direction along the left and right of the window surface of the sliding window 100. A plane along the finding direction may be described as a finding plane.

[0010] The sliding window 100 has a frame body 11 disposed in an opening formed in a building (not shown), a shoji 12 housed inside the frame body 11, an operator handle 13, and a sub-block 1. Hereinafter, the sliding window 100 as a fitting will be described as a vertical sliding window, but the lock mechanism of the present disclosure may be applied to a horizontal sliding window, or may be applied to a vertical opening window or a horizontal opening window.

[0011] The frame body 11 is configured by framing an upper frame, a lower frame, and a pair of vertical frames in a rectangle corresponding to the shape of the opening of the building. The frame body 11 and the shoji 12 may be made of a metal such as aluminum, or may be, for example, a resin composite sash in which the outdoor side is made of aluminum and the indoor side is made of resin, or may be made only of resin.

[0012] The shoji 12 is disposed inside the frame body 11 so as to be openable and closable. The shoji 12 is configured by housing one or a plurality of glass plates 121 inside a frame formed by framing an upper frame, a lower frame, and left and right vertical frames in a rectangle. A pair of stays 123 that support the opening and closing operation of the shoji 12 are provided above and below the shoji 12, respectively. The stays 123 are respectively bridged between the upper frame and the upper frame, and the lower frame and the lower frame.

[0013] The operator handle 13 is provided on the indoor-side finding surface of the lower frame of the frame body 11. The operator handle 13 is configured to be able to open and close the shoji 12 by transmitting a rotational force to the shoji 12 via an operating arm attached from the lower frame to the shoji 12.

[0014] The sub-block 1 as a locking mechanism is provided on the indoor-side prospective surface of the vertical frame of the frame body 11. The sub-block 1 has an arm 50 with a tip having a substantially U-shaped configuration. As shown in FIG. 3, the arm 50 is engageable with an engaging portion 122 provided on the prospective surface of the vertical frame of the shoji 12 on the side that contacts the frame body 11. The sub-block 1 restricts and locks the opening operation of the shoji 12 in the closed position when the arm 50 engages with the engaging portion 122.

[0015] As shown in FIG. 4, the sub-block 1 has a handle lever 2, a handle pedestal 3, an airtight case 4 as an airtight structure, a main body portion 5 having an arm 50, and a back plate 6.

[0016] The handle lever 2 is provided for the user of the sub-block 1 (hereinafter, may be simply described as "user") to transmit a rotational force to the arm 50. The handle lever 2 has a substantially L-shaped configuration as shown in FIG. 11, and has a gripping portion 21, a handle shaft 22, and a support portion 23. The gripping portion 21 and the support portion 23 may be integrally formed of resin. The handle shaft 22 is a metal rod having a rectangular cross-sectional shape, and the tip portion thereof is engageable with the shaft hole 501 of the arm 50 shown in FIG. 9. The base end side of the handle shaft 22 is immersed in and supported by the support portion 23.

[0017] The support portion 23 is provided at the longitudinal end of the gripping portion 21 and has a substantially cylindrical shape extending in a direction orthogonal to the longitudinal direction. The support portion 23 supports the handle shaft 22 and is configured to be insertable into the hole portion 31 of the handle pedestal 3 described later. As shown in FIGS. 11 and 12, a pair of opposing flat portions 231 as non-interference portions are provided on the outer periphery of the support portion 23. The flat portion 231 is a surface orthogonal to the short direction of the handle lever 2. The configuration of the non-interference portion is not limited to the flat portion 231, and any portion that does not interfere with the convex portion 312 when the support portion 23 is inserted into the hole portion 31 at a predetermined angle described later may be used. For example, a concave portion corresponding to the shape of the convex portion 312 may be used. A groove portion 232 is provided on the proximal end side of the support portion 23 relative to the flat portion 231 on the side portion of the support portion 23.

[0018] The handle pedestal 3 fixes the handle lever 2 to the main body portion 5 and the back plate 6 via the airtight case 4. As shown in FIG. 7, the handle pedestal 3 has a substantially rectangular parallelepiped shape and includes a hole portion 31, a holding portion 32, a fixing portion 33, and a screw hole 34. The handle pedestal 3 is made of, for example, resin.

[0019] The hole portion 31 is a hole portion into which the handle shaft 22 and the support portion 23 of the handle lever 2 can be inserted. A pair of opposing convex portions 312 are provided on a part of the inner surface of the hole portion 31. The shape of the convex portion 312 is not particularly limited. For example, the tip is flat, and the flat surface is orthogonal to the longitudinal direction of the handle pedestal 3. The convex portion 312 is configured such that the support portion 23 can be completely inserted into the hole portion 31 only when the positions of the pair of flat portions 231 coincide with the positions of the convex portion 312. That is, the support portion 23 can be inserted into the hole portion 31 of the handle pedestal 3 only at a predetermined angle (in this embodiment, the angle formed by the longitudinal direction of the handle lever 2 and the longitudinal direction of the handle pedestal 3 is 90 degrees). On the other hand, even if an attempt is made to insert the support portion 23 into the hole portion 31 of the handle pedestal 3 at an angle other than 90 degrees (for example, 80 degrees) described above, the insertion of the support portion 23 is restricted by the convex portion 312. The convex portion 312 is disposed at a position corresponding to the groove portion 232 in a state where the support portion 23 is completely inserted into the hole portion 31 with respect to the hole portion 31. In this state, the handle lever 2 is rotatable with respect to the handle shaft 22.

[0020] The procedure for assembling the handle lever 2 to the handle pedestal 3 will be described below. As shown in FIG. 13, with the longitudinal direction of the handle lever 2 orthogonal to the longitudinal direction of the handle pedestal 3 such that the position of the flat portion 231 coincides with the position of the convex portion 312, the handle shaft 22 and the support portion 23 are inserted into the hole portion 31. Thereafter, the handle lever 2 is rotated to any position within the operating region y1 of the handle lever 2 shown in FIG. 14, and the tip of the handle shaft 22 is inserted into the shaft hole 501 of the arm 50 shown in FIG. 9. Thereafter, the handle lever 2 is rotated to a position where the screw hole 34 is exposed, and the screw F1 shown in FIG. 5 is inserted through the screw hole 34 to fix the handle lever 2 and the handle pedestal 3 to the airtight case 4 and the back plate 6. After fixing, as shown in FIG. 3, the handle lever 2 is rotated to be parallel to the handle pedestal 3. After fixing, in any position within the operating region y1, the position of the flat portion 231 does not coincide with the position of the convex portion 312, and the convex portion 312 engages with the groove portion 232 and is fixed. With the configurations of the handle lever 2 and the handle pedestal 3 as described above, washers, O-rings, etc. are not required, the number of parts of the sub-block 1 can be significantly reduced, and the airtightness between the handle lever 2 side and the airtight case 4 side can be ensured.

[0021] On the back side of the hole portion 31 that abuts against the airtight case 4, as shown in FIG. 7, a cylindrical portion 311 having a substantially cylindrical shape with the periphery of the hole portion 31 protruding is formed. The edge of the cylindrical portion 311 is a surface perpendicular to the protruding direction of the cylindrical portion 311 that can abut against the airtight case 4.

[0022] The holding portion 32 protrudes from the back side of the handle pedestal 3 and has a substantially cylindrical shape. As shown in FIG. 5, the holding portion 32 is provided so as to coincide with the position of the screw head of the screw F2 that fixes the airtight case 4 to the back plate 6 when the handle pedestal 3 is assembled to the airtight case 4. The holding portion 32 can be used as a positioning means when assembling the handle pedestal 3 by holding the screw head of the screw F2 on the inner peripheral side. With the holding portion 32, it is not necessary to perform hole processing for positioning on the main body portion, and the airtightness of the lock mechanism can be further improved.

[0023] The fixing part 33 protrudes from the back side of the handle pedestal 3 and has a substantially square tube shape. As shown in FIG. 5, when the handle pedestal 3 is fixed to the back plate 6 via the airtight case 4, the fixing part 33 is provided so as to be insertable into the fixing hole 61 of the back plate 6. Since the rotation of the handle pedestal 3 is restricted by the holding part 32 and the fixing part 33, it becomes possible to minimize the number of screws for fixing the sub-block 1. Furthermore, since it is not necessary to perform hole processing for positioning and fixing on the airtight case 4 or the main body part 5, the airtightness between the indoor side and the outdoor side can be ensured.

[0024] As shown in FIG. 5, the screw hole 34 is a screw hole that can be screwed with a screw F1 for fixing the handle pedestal 3 to the back plate 6 via the airtight case 4 and the main body part 5. On the back side of the handle pedestal 3, a cylindrical part having a substantially cylindrical shape is formed with the periphery of the screw hole 34 protruding.

[0025] The airtight case 4 closes the opening on the outdoor side where the main body part 5 is arranged, thereby ensuring the airtightness between the indoor side prospective surface of the vertical frame of the frame body 11 where the handle lever 2 is arranged and the outdoor side finding surface of the vertical frame of the frame body 11 where the opening 111 for inserting the sub-block 1 is formed. The airtight case 4 makes it difficult for outside air to flow to the back side of the vertical frame, and it is possible to make it difficult for the user to feel unpleasant cold air when operating the handle lever 2.

[0026] As shown in FIGS. 4 and 5, the airtight case 4 is a box-shaped body in which the main body part 5 is arranged inside, and has an opening corresponding to the operating region of the arm 50. The airtight case 4 is composed of two members, a lid member 41 and a mounting member 42. By arranging the main body part 5 between the lid member 41 and the mounting member 42 and fitting and fixing the lid member 41 and the mounting member 42, the main body part 5 can be arranged inside the airtight case 4. The airtight case 4 is made of, for example, resin.

[0027] The lid member 41 is a member on the side that contacts the handle pedestal 3. FIG. 6 is a view of the airtight case 4 viewed from the lid member 41 side. As shown in FIG. 6, the lid member 41 has screw holes 411 and 413 and a shaft hole 412.

[0028] The shaft hole 412 is a hole through which the handle shaft 22 is inserted. The diameter of the shaft hole 412 is smaller than the outer diameter of the cylindrical portion 311. A stepped portion 412a, which is a recess capable of arranging the cylindrical portion 311, is provided around the shaft hole 412. The stepped portion 412a is configured to be larger than the outer diameter of the cylindrical portion 311 so as to absorb mounting errors, and to prevent the shaft hole 412 from being exposed to the outside during mounting. The end of the cylindrical portion 311 and the stepped portion 412a are fixed in contact with each other. Thereby, it is possible to prevent air flowing in from the opening where the arm 50 operates from leaking to the indoor side.

[0029] The screw holes 411 and 413 are holes through which the screws F2 and F1 are inserted, respectively. A stepped portion 411a, which is a recess capable of arranging the holding portion 32, is provided around the screw hole 411. A stepped portion 413a, which is a recess capable of arranging the cylindrical portion formed around the screw hole 34, is provided around the screw hole 413. The stepped portion 411a and the stepped portion 413a have the same configuration as the stepped portion 412a, and the end of the holding portion 32 and the stepped portion 411a are fixed in contact with each other. The end of the cylindrical portion formed around the screw hole 34 and the stepped portion 413a are fixed in contact with each other. Thereby, it is possible to prevent air flowing in from the opening where the arm 50 operates from leaking to the indoor side.

[0030] As shown in FIG. 5, the mounting member 42 is a member on the side that contacts the back plate 6. FIG. 8 is a view of the mounting member 42 as viewed from the lid member 41 side. The mounting member 42 has convex portions 421 at positions corresponding to the convex portions 52a and 52b of the second plate member 52 described later, respectively. The convex portion 421 is integrally formed as a thick portion of the mounting member 42 formed of, for example, resin. The mounting member 42 has holes through which the screws F1 and F2 can be inserted.

[0031] As shown in FIG. 6, the airtight case 4 has a flange 414 arranged along the opening 111 of the frame body 11 and a recess 415 provided on the back side of the flange 414. The recess 415 allows the sub-block 1 to be easily attached to the frame body 11. The function of the recess 415 will be described in detail in the following section.

[0032] As shown in Fig. 5, the main body portion 5 is composed of an arm 50, a first plate member 51, and a second plate member 52. The arm 50 is rotatably clamped by the first plate member 51 and the second plate member. The main body portion 5 is made of, for example, metal.

[0033] As shown in Fig. 9, the arm 50 has a tip portion with a substantially U-shaped form protruding from the airtight case 4, a shaft hole 501 into which the tip of the handle shaft 22 is inserted and engaged, a locking hole 502a, and an unlocking hole 502b. The arm 50 is rotatably fixed within a predetermined operating range with the shaft hole 501 as the axis. The tip portion of the arm 50 can be engaged with an engaging portion 122 provided on the prospective surface on the side contacting the frame body 11 of the vertical stile of the shoji 12.

[0034] The first plate member 51 is a plate-shaped member disposed on the lid member 41 side, and the second plate member 52 is a plate-shaped member disposed on the attachment member 42 side. The first plate member 51 and the second plate member 52, which are a pair of plate members, have a substantially H-shaped form and have hole portions through which screws F1 and F2 can be inserted. A hole portion through which the handle shaft 22 can be inserted is formed in the first plate member 51.

[0035] The first plate member 51 and the second plate member 52 rotatably clamp the arm 50 and hold the arm 50 at the locking position and the unlocking position by click fitting so that the user can distinguish the locked state and the unlocked state of the sub-block 1 by the operating feeling of the handle lever 2. As used in this specification, "click fitting" not only means a simple fitting between members, but also means a fitting accompanied by an operating feeling such as a sound and a touch feeling generated when the arm 50 moves to the locking position and the unlocking position along with the operation of the handle lever 2. Thus, the above click fitting aims to convey the operating feeling to the user as a sound and a touch to the fingers. Also, the above click fitting can hold the arm 50 against the force of the arm 50 moving from the locking position to the unlocking position due to the self-weight of the arm 50, wind pressure, vibration, etc. The above click fitting can be realized by the following configuration.

[0036] As shown in Fig. 9, the first plate member 51 and the second plate member 52 sandwich the portions where the locking hole 502a and the unlocking hole 502b of the arm 50 are provided, except for the portions where the holes through which the screws F1 and F2 can be inserted and the hole through which the handle shaft 22 can be inserted are provided, and are biased in the direction of sandwiching the arm 50. As shown in Fig. 10, the second plate member 52 has a convex portion 52a and a convex portion 52b. The convex portion 52a and the convex portion 52b are formed integrally with the second plate member. Thereby, the number of parts of the sub-block 1 can be reduced.

[0037] Fig. 9 is a view of the main body portion 5 as viewed from the side of the first plate member 51, and shows the position where the arm 50 engages with the engaging portion 122. At this position, as shown in Fig. 10, the convex portion 52a of the second plate member fits into the locking hole 502a. When the user operates the handle lever 2 in Fig. 9 and the arm 50 rotates downward, the locking hole 502a gets over the convex portion 52a, and the operating feeling is transmitted to the user's fingers. When the user operates the handle lever 2 and moves the arm 50 to the lowermost position in the operating region, the unlocking hole 502b enters the convex portion 52b, the operating feeling is transmitted to the user's fingers, the convex portion 52b of the second plate member fits into the unlocking hole 502b, and the engagement between the arm 50 and the engaging portion 122 is disengaged, and the shoji 12 is in the unlocked state. By providing the convex portions 52a and 52b that fit with the locking hole 502a and the unlocking hole 502b in the main body portion 5 itself, the above click fit can be realized without increasing the number of parts. Further, convex portions 421 are formed at positions corresponding to the convex portions 52a and 52b of the mounting member 42, respectively. Thereby, the above-mentioned fitting force can be increased without increasing the number of parts. In the present embodiment, the convex portions 421 corresponding to the convex portions 52a and 52b are formed separately, but the present invention is not limited to this, and a long convex portion 421 may be used as long as it can correspond to the convex portions 52a and 52b.

[0038] The back plate 6 is a plate-like member that fixes the handle lever 2, the handle pedestal 3, the airtight case 4, and the main body 5 to the vertical frame of the frame body 11. By fixing each of the above members via the back plate 6, the mounting accuracy of each member can be improved, and the airtightness of the sub-block 1 can be further improved. In addition to the above, since the sub-block 1 can be firmly fixed, the crime prevention performance can be improved. The back plate 6 is made of, for example, metal. The back plate 6 is provided with a fixing hole 61 through which the fixing portion 33 of the handle pedestal 3 can be inserted. In addition to the above, the back plate 6 is formed with a hole portion into which screws F1 and F2 can be screwed, and a hole portion through which a fixture for fixing the back plate 6 to the vertical frame can be inserted.

[0039] Hereinafter, other embodiments of the present disclosure will be described. For the same configurations as those in the first embodiment, the same reference numerals may be given in the drawings, and the description may be omitted.

[0040] [Second Embodiment] FIGS. 15 and 20 are perspective views showing the mounting state of the sub-block 1a according to the second embodiment. The sub-block 1a has an arm 50a that can engage with an engagement pin 143 provided on the interlocking bar 14. The sub-block 1a is configured to be able to slide the interlocking bar 14 in the vertical direction by transmitting the rotational force of the handle lever 2 to the interlocking bar 14 via the arm 50a.

[0041] The interlocking bar 14 is provided on the prospective surface on the outdoor side of the vertical frame of the frame body 11. The interlocking bar 14 has an engaging portion 142 that can engage with an engaging portion 122 provided on the prospective surface on the side where the vertical frame of the shoji 12 abuts against the frame body 11. In the state where the interlocking bar 14 is slid to the lowest position, the engagement between the engaging portion 122 and the engaging portion 142 is released, and the shoji 12 is in the unlocked state. When the user operates the operator handle 13 and inserts the engagement pin of the engaging portion 122 into the engaging portion 142 and then operates the handle lever 2 to slide the interlocking bar 14 upward, the shoji 12 is completely pulled to the indoor side and the engaging portion 122 and the engaging portion 142 are engaged, and the shoji 12 is in the locked state. A plurality of sets of the engaging portion 122 and the engaging portion 142 may be provided.

[0042] As shown in Fig. 16, the sub-block 1a has an arm 50a having a hole portion engageable with the engagement pin 143 at the tip. The arm 50a has the same configuration as the arm 50 except for the different shape of the tip. The configuration other than the arm 50a of the sub-block 1a can be the same as that of the sub-block 1.

[0043] Next, with reference to Figs. 21 to 25, the state in which the opening of the frame body 11 where the sub-block 1a is disposed is closed by the airtight case 4 will be described. Since the sub-block 1a has the same configuration as the sub-block 1 except for the configuration of the arm 50a, the following description is also applicable to the sub-block 1.

[0044] Fig. 21 is a view of the sub-block 1a disposed on the prospective surface of the frame body 11 (vertical frame) as viewed from the finding direction. The right side where the handle lever 2 and the handle pedestal 3 in Fig. 21 are disposed is the indoor side, and the left side where the arm 50a is disposed is the outdoor side. Fig. 22 is a cross-sectional view taken along the line B-B of Fig. 21. The handle pedestal 3 and the airtight case 4 are in contact with each other and fixed by their surfaces.

[0045] As shown in Figs. 23 to 25, the outdoor space Z and the internal space Y of the frame body 11 are closed by the airtight case 4. The frame body 11 is provided with an opening 111 for disposing the sub-block 1a and operating the arm 50a. The periphery of the opening 111 is covered by the airtight case 4. An air flow can flow into the airtight case 4 from the opening 111. However, the airtight case 4 has a configuration without openings other than the opening 111 so that the air flow flowing into the airtight case 4 through the opening 111 does not flow out to the outside of the airtight case 4. For this reason, the air flowing from the outdoor space Z does not reach the internal space Y of the frame body 11 or the indoor side, and it is possible to make it difficult for the user to feel unpleasant cold air when operating the handle lever 2.

[0046] (Method of attaching the sub-block to the sliding window) The method of attaching the sub-block 1a to the sliding window 100 includes the steps of placing the main body 5a inside the airtight case 4, fixing the back plate 6 to the vertical frame of the frame body 11, inserting and engaging the engagement pin 143 into the hole 50a1 of the arm 50a as shown in Figure 18, inserting the airtight case 4 into the opening 111 while rotating it around the engagement pin 143 as the central axis as shown in Figure 19, and fixing the airtight case 4 and the main body 5a, as well as the handle base 3 and the handle lever 2 to the back plate 6.

[0047] As shown in Fig. 18, the main body 5a of the sub-lock 1a is inserted into the room through an opening 111 provided in the vertical frame of the frame body 11 and fixed therein, with the hole 50a1 of the arm 50a engaged with the engagement pin 143. However, since the main body 5a is covered by the airtight case 4 having a flange 414 for closing the opening 111, it is necessary to prevent interference between the flange 414 and the periphery of the opening 111 when inserting the airtight case 4 into the opening 111. In this regard, a recess 415 is provided on the back side of the flange 414 of the airtight case 4. As a result, when the airtight case 4 is rotated about the engagement pin 143 as a central axis and inserted into the opening 111, the recess 415 can be inserted into the opening 111 so that the edge of the opening 111 is fitted into the edge of the opening 111, thereby preventing interference between the flange 414 and the periphery of the opening 111.

[0048] [Third embodiment] 26 to 28 are diagrams showing a sub-lock 1b of the third embodiment. As in the second embodiment, the sub-lock 1b has an arm 50b that engages with the interlocking bar 14. The configuration of the interlocking bar 14 with which the arm 50b can engage is the same as in the second embodiment.

[0049] 26 and 27, the sub-lock 1b has a handle lever 2, a handle base 3a, an airtight case 4a, an arm 50b, and a back plate 6. The sub-lock 1b does not have a first plate member 51 or a second plate member 52, and the airtight case 4a itself has a click-fit function. The handle base 3a has the same configuration as the handle base 3, except that it has a shape corresponding to the shape of the airtight case 4a.

[0050] The airtight case 4a has a lid member 41a and a mounting member 42a. FIG. 28 is a view of the airtight case 4a viewed from the handle pedestal 3a side with the lid member 41a removed. As shown in FIG. 28, the airtight case 4a has a convex portion 53a formed around the shaft hole 501 of the arm 50b, and an engaging portion 43 having a convex portion 43a that can be fitted with the convex portion 53b at its tip. The engaging portion 43 is made of an elastic body such as resin and is elastically deformable.

[0051] Similar to the arm 50a, the arm 50b has a hole portion at its tip that can engage with the engaging pin 143. The periphery of the shaft hole 501 of the arm 50b is formed in a substantially disk shape and is accommodated in the airtight case 4a so as to be rotatable in a predetermined operating region around the shaft hole 501. A restricting portion 54 for restricting the rotation of the arm 50b within the operating region is formed at the base end portion of the arm 50b, which is the peripheral edge portion of the shaft hole 501. Convex portions 53a and 53b are formed on the peripheral edge portion of the shaft hole 501 in addition to the restricting portion 54.

[0052] FIG. 28 shows the position of the arm 50b when the arm 50b slides the interlocking bar 14 to the uppermost position, the engaging portion 122 and the engaging portion 142 are engaged, and the shoji 12 is in the locked state. At this position, as shown in FIG. 28, the convex portion 43a and the convex portion 53a are fitted together. When the user rotates the handle lever 2 in this state, the convex portion 43a gets over the convex portion 53a, and the operating feeling is transmitted to the user's fingers. When the user further rotates the handle lever 2, the convex portion 43a gets over the convex portion 53b, the operating feeling is transmitted to the user's fingers, and the convex portion 53b and the convex portion 43a are fitted together. In this state, the interlocking bar 14 is slid to the lowermost position by the arm 50b, the engagement between the engaging portion 122 and the engaging portion 142 is released, and the shoji 12 is in the unlocked state. According to the configurations of the arm 50b and the airtight case 4a described above, the arm 50b and the airtight case 4a can be click-fitted without using a plate member for clamping and fixing the arm, and the operating feeling during locking and unlocking can be transmitted to the user's fingers.

[0053] The present disclosure is not limited to the above embodiments, and modifications, improvements, etc. within the scope that can achieve the object of the present disclosure are included in the present disclosure.

[0054] Although the lock mechanism according to this embodiment has been described as sub-blocks 1, 1a, and 1b, it is not limited to the above. The configuration of the lock mechanism of the present disclosure can also be applied to other lock mechanisms such as cam latch handles and crescent locks.

[0055] The arm 50b of the sub-block 1b of the third embodiment has been described as an arm having a hole at the tip in the same manner as the arm 50a. It is not limited to the above. The arm 50b may have a tip portion having a substantially U-shaped configuration similar to the arm 50. In this case, similar to the first embodiment, the sub-block 1b is in a locked state by the arm directly engaging with the engaging portion 122 of the frame body 11. At this time, the interlocking bar 14 is not arranged on the vertical frame of the frame body 11.

Explanation of Reference Numerals

[0056] 1, 1a, 1b Sub-blocks (lock mechanisms), 2 Handle lever, 3, 3a Handle pedestal, 4, 4a Airtight case (airtight structure), 414 Flange, 415 Recess, 421 Protrusion, 5, 5a Main body portion, 50, 50a, 50b Arms, 51 First plate member, 52 Second plate member, 6 Back plate, 100 Slide-out window (fitting), 11 Frame body, 12 Shoji, 122 Engaging portion

Claims

1. A locking mechanism for a building fixture, comprising: a main body portion having an arm that engages with a part of a shoji screen of the building fixture, a handle lever, and a handle pedestal; the arm has a shaft hole into which a tip of a shaft portion of the handle lever is inserted and engaged; a support portion that supports the shaft portion of the handle lever can be inserted into a hole portion formed in the handle pedestal only at a predetermined angle; the hole portion is provided with a convex portion that restricts the insertion of the support portion at an angle other than the predetermined angle; the support portion is provided with a non-interference portion at a position corresponding to the convex portion at the predetermined angle; with the support portion inserted into the hole portion formed in the handle pedestal, the handle lever is rotatable; when the handle lever is rotated to a position corresponding to the operating region of the arm and the shaft hole and the shaft portion are engaged, the angle between the handle lever and the handle pedestal is restricted within the operating region of the arm so that the angle between the handle lever and the handle pedestal does not become the predetermined angle. A locking mechanism.

2. The locking mechanism according to claim 1, wherein a groove portion is provided on a base end side of the support portion with respect to the non-interference portion, and the groove portion is disposed at a position corresponding to the convex portion.

3. The locking mechanism according to claim 1 or 2, wherein the shaft hole is a rectangular shaft hole corresponding to a rectangular cross-sectional shape of the shaft portion.

4. The main body portion has a pair of plate members that rotatably sandwich the arm, and the rotation of the arm is restricted within the operating region by a part of the arm abutting against a part of the pair of plate members. The locking mechanism according to any one of claims 1 to 3.

5. The locking mechanism according to any one of claims 1 to 4, further comprising an airtight case that covers the main body portion and closes an outdoor-side opening of a space in which the locking mechanism formed in the frame of the building fixture is disposed.

6. The handle lever is fixed to the airtight case via the handle pedestal, and an end portion of the handle pedestal and the airtight case are fixed with surfaces in contact with each other. The locking mechanism according to claim 5.

7. A building fixture having the locking mechanism according to any one of claims 1 to 6.

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