Locking devices and fixtures

Abstract

To facilitate a manufacturing operation or an assembly operation.SOLUTION: A lock device 10 comprises: a shaft member 40; a tray member 30; and a crescent receiver 11. When the tray member 30 is rotated from a prescribed unlock position to a lock position relative to a reinforcement member 21 of a pedestal 20, a hook part 30b can be engaged with the crescent receiver 11. In a portion that becomes a periphery of the shaft member 40 in a base plate part 30a, a detection lever 50 is provided to allow further rotation of the tray member 30 only when abutted on the crescent receiver 11 accompanying the rotation of the tray member 30 to the lock position. A small-diameter part 40a having a diameter smaller than a large-diameter part 40b on a base end side is provided in a part corresponding to the detection lever 50 in the shaft member 40. A shaft support part 30h is provided on the tray member 30 to project towards a step part 40d formed between the small-diameter part 40a and the large-diameter part 40b in the shaft member 40.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a locking device and a fitting including a dish member provided on one shoji door and a receiving member provided on the other shoji door.

Background Art

[0002] In a locking device applied to fittings such as a sliding window, parts such as a detection member may be provided on the substrate portion of the dish member so that the dish member can be engaged with the receiving member only when the two shoji doors are in the closed position. The detection member is configured to restrict the rotation of the dish member with respect to the pedestal by engaging with the pedestal that rotatably supports the dish member. In this type of locking device, a relief notch is provided on the circumferential surface of the shaft member that rotatably supports the dish member with respect to the pedestal, so as to prevent a situation where the shaft member and the detection member interfere with each other (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Incidentally, the aforementioned notches cannot be provided around the entire circumference of the shaft member, and must only be provided on a portion facing the detection member. That is, for the portion of the shaft member that does not face the detection member, the stepped portion formed between the shaft member and the larger diameter portion is made to face the base portion of the disc member, thereby preventing the disc member from wobbling in the axial direction of the shaft member. For this reason, when manufacturing the shaft member, it is necessary to create the notches by additional machining, which raises concerns about complicating the manufacturing process. Moreover, when assembling the locking device, the position of the notches on the shaft member and the position where the detection member is provided on the disc member must coincide in the rotational direction, which can be a factor in complicating the assembly process. Incidentally, in locking devices, efforts are made to reduce manufacturing costs by sharing parts. For this reason, the above-mentioned problems can similarly occur in locking devices where the detection member is not provided on the disc member, by sharing the shaft member.

[0005] In view of the above circumstances, the present invention aims to provide a locking device and a building fixture that can facilitate manufacturing and assembly work. [Means for solving the problem]

[0006] To achieve the above objective, the locking device according to the present invention comprises a base attached to one profile, a shaft member rotatably supported on the base via its tip, a plate member having a through hole in its base and a hook portion around a part of the base centered on the through hole, and the shaft member passing through the through hole, thereby being rotatably supported on the base together with the shaft member, and a receiving member provided on the other profile, wherein when the plate member is rotated from a predetermined unlocked position to a locked position relative to the base, the hook portion can engage with the receiving member, thereby restricting the relative movement between the one profile and the other profile, characterized in that the shaft member is provided with a smaller diameter portion which is smaller in diameter than the larger diameter portion at the base end, and the plate member is provided with a shaft support portion which protrudes toward a stepped portion formed between the smaller diameter portion and the larger diameter portion of the shaft member. [Effects of the Invention]

[0007] According to the present invention, since the base portion of the disc member is provided with a shaft support portion that protrudes toward the stepped portion, the shaft support portion can be brought into contact with the stepped portion, and the narrow diameter portion and the wide diameter portion of the shaft member can be configured to have circular cross-sections. Therefore, not only is it possible to manufacture the shaft member without requiring additional processing, but it is also unnecessary to position the shaft member and the disc member in the rotational direction during assembly, thereby simplifying manufacturing and assembly work. [Brief explanation of the drawing]

[0008] [Figure 1] This is a view of a door or window to which a locking device according to an embodiment of the present invention is applied, as seen from the interior side. [Figure 2] Figure 1 is a cross-sectional view of the main part of the joinery. [Figure 3] Figure 1 is a perspective view showing the main parts of the joinery as seen from the interior side. [Figure 4] Figure 1 is an exploded perspective view of the crescent lock mechanism applied to the door frame shown, viewed from the operating handle side. [Figure 5] Figure 1 is an exploded perspective view of the crescent lock mechanism applied to the door frame shown, viewed from the base side. [Figure 6] Figure 1 shows a locking mechanism applicable to the joinery shown in Figure 1, where (a) is an exploded side view with a portion cut away, and (b) is a side view in the assembled state. [Figure 7] Figure 1 shows the components of a locking device applied to the building fixture shown in Figure 1. (a) is a perspective view of the reinforcing member seen from the front side, and (b) is a perspective view of the cover member seen from the back side. [Figure 8] Figure 1 is a perspective view from the side of the plate member showing the assembled state of the reinforcing member, plate member, and shaft member of a locking device applied to the joinery shown in Figure 1. [Figure 9] Figure 1 is a side view perspective of the assembled state of the reinforcing member, plate member, and shaft member of a locking device applied to the joinery shown in Figure 1. [Figure 10] Figure 1 shows a perspective view of the assembled state of the reinforcing member, plate member, and shaft member of a locking device applied to the joinery shown in Figure 1, viewed from the back side of the reinforcing member. [Figure 11] Figure 10 is a perspective view of the assembled state of the reinforcing member, plate member, and shaft member of the locking device applied to the joinery shown in Figure 1, viewed from the opposite side. [Figure 12] This is a perspective view showing the shaft member of a locking device applied to the joinery shown in Figure 1. [Figure 13] Figure 1 shows the main parts of a locking device applied to the building fixture shown in Figure 1. (a) is a view of only the cover member from the front side, (b) is a view of the cover member, plate member, and detection member with the plate member in the unlocked position, and (c) is a view of the cover member, plate member, and detection member with the plate member in the locked position. [Figure 14] Figure 1 shows the condition of a locking device applied to a door or window after it has been exposed to high temperatures. (a) is a view from the interior side of the door or window, and (b) is a cross-sectional side view thereof. [Modes for carrying out the invention]

[0009] The following describes in detail preferred embodiments of the locking device and door / window according to the present invention with reference to the attached drawings. For convenience, the terms "depth direction" and "face direction" may be used below. The depth direction is the direction along the depth of the door / window, as indicated by arrow A in the figure. The surface along the depth direction may be referred to as the depth surface. The face direction is the direction along the vertical direction perpendicular to the depth direction, in the case of a frame that extends horizontally, such as a bottom frame. In the case of a frame that extends vertically, such as a vertical frame, the face direction is the direction along the horizontal direction perpendicular to the depth direction. The surface along the face direction may be referred to as the face surface.

[0010] Figures 1 to 3 show a window to which a locking device according to an embodiment of the present invention is applied. The window to which this example is described is called a sliding window, comprising a frame 1, an outer sash 2A disposed on the exterior side of the frame 1, and an inner sash 2B disposed on the interior side of the frame 1. The frame 1 is constructed in a rectangular shape by assembling left and right vertical frames 1A, an upper frame 1B, and a lower frame 1C around the four sides. The outer sash 2A is constructed comprising a rectangular surface material 2Aa such as double-glazed glass, and left and right vertical frames 2Ab, 2Ac, an upper frame 2Ad, and a lower frame 2Ae disposed around the four sides of the surface material 2Aa. Similarly, the inner sash 2B is constructed with a rectangular surface material 2Ba, such as double-glazed glass, and left and right vertical frames 2Bb, 2Bc, an upper frame 2Bd, and a lower frame 2Be arranged around the surface material 2Ba. In this embodiment, the outer sash 2A and the inner sash 2B are arranged to move along the longitudinal sides of the upper frame 1B and lower frame 1C relative to the frame 1, and the opening of the frame 1 can be closed when the outer sash 2A is placed on the left side of the frame 1 and the inner sash 2B is placed on the right side when viewed from the interior side. When the opening of the frame 1 is closed, the vertical frame (shaped material: hereinafter referred to as the outer meeting frame 2Ac) located to the right of the outer sash 2A when viewed from the interior side and the vertical frame (shaped material: hereinafter referred to as the inner meeting frame 2Bc) located to the left of the inner sash 2B meet and are arranged side by side in the depth direction. Each frame constituting the outer sash 2A and the inner sash 2B is an extruded profile formed from a metal such as an aluminum alloy, and is configured to have a cross-sectional shape that is almost uniform along its entire length.

[0011] This door and window is equipped with a locking device 10 between the outer meeting stile 2Ac of the outer sliding door 2A and the inner meeting stile 2Bc of the inner sliding door 2B. The locking device 10 is constructed by providing a crescent receiver (receiving member) 11 on the outer meeting stile 2Ac and a crescent 12 on the inner meeting stile 2Bc. The crescent receiver 11 is constructed by providing a hook portion 11b at one end of the receiving body 11a. The crescent receiver 11 is attached to the outer meeting stile 2Ac via the receiving body 11a, with the hook portion 11b protruding inward from the inner circumference of the outer meeting stile 2Ac's visible surface. The crescent 12 has a dish member 30 rotatably mounted on a base 20 via a shaft member 40, and is attached to the inner surface of the inner meeting frame 2Bc via the base 20 with the shaft member 40, which is the axis of rotation of the dish member 30, being approximately horizontal along the facing direction.

[0012] The components of the crescent 12 will be described in detail below, with reference to Figures 4 to 13 as appropriate, and the distinctive features of the present invention will also be explained. As described above, the crescent 12 is composed of a base 20, a dish member 30, and a shaft member 40. The base 20 is the attachment part to the inner meeting frame 2Bc and is equipped with a reinforcing member 21 and a cover member 22.

[0013] The reinforcing member 21 is formed of a metal with higher fire resistance than an aluminum alloy, such as stainless steel, and has a shaft support plate portion 21a, a connecting portion 21b, and a mounting plate portion 21c. The shaft support plate portion 21a is in the shape of a flat plate extending along the longitudinal direction of the inner calling frame 2Bc, and a shaft support hole 21d is provided at a portion approximately in the middle of the longitudinal direction. Protrusions 21e are provided at four locations on the inner peripheral surface of the shaft support hole 21d. The protrusions 21e protrude from portions that are equally spaced from each other toward the center, and each protrusion end has an arcuate sliding surface 21f. The sliding surface 21f is formed along a circumference centered on a common axis. The connecting portion 21b extends by bending from both ends of the shaft support plate portion 21a in the same direction as each other. The mounting plate portion 21c is in the shape of a flat plate extending in a direction away from each other from the respective connecting portions 21b, and is configured to be substantially parallel to the shaft support plate portion 21a and located on the same plane as each other. Each mounting plate portion 21c is provided with a screw insertion portion 21g and a side plate portion 21h. The screw insertion portion 21g is a through portion formed to have a width through which the shaft portion Sa of a mounting screw S to be described later can be inserted and through which the head portion Sb cannot be inserted. The side plate portion 21h is in the shape of a flat plate protruding from both side edges of each mounting plate portion 21c toward the shaft support plate portion 21a side so as to be substantially parallel to each other. The protruding dimension s of the side plate portion 21h are the same as each other and are set to be smaller than the shaft support plate portion 21a.

[0014] In addition, the reinforcing member 21 is provided with a support projection 21i, two support legs 21j, and four screw support portions 21k. The support projection 21i is bent and extended in a direction opposite to the connecting portion 21b from a portion adjacent to the shaft support hole 21d at one edge of the shaft support plate portion 21a. The support legs 21j are bent and extended in the same direction as the connecting portion 21b from portions on both sides of the support projection 21i at one edge of the shaft support plate portion 21a. The extending ends of the support legs 21j are configured to be located on substantially the same plane as the protruding side plane of the mounting plate portion 21c. That is, when the mounting plate portions 21c are placed on a plane respectively, the extending dimensions of the support legs 21j are set so that the extending ends of the support legs 21j contact the same plane respectively. The screw support portion 21k is a protruding portion provided at the protruding edge of each side plate portion 21h. The protruding dimensions of the screw support portions 21k are set to be the same as each other.

[0015] The cover member 22 is formed by die-casting a metal with a relatively low melting point, such as a zinc alloy, and is configured in a shape and dimensions that can cover the reinforcing member 21. That is, the cover member 22 is integrally formed with a center cover portion 22A that covers the surface of the shaft support plate portion 21a, two side cover portions 22B that cover the surface of the mounting plate portion 21c, and a round cover portion 22C that covers the periphery of the reinforcing member 21. In the illustrated example, the portion arranged on the outdoor side on the finding surface of the inner calling frame 2Bc (hereinafter referred to as the outer portion of the cover member 22 when distinguishing) protrudes in a substantially arc shape, while the portion arranged on the indoor side (hereinafter referred to as the inner portion of the cover member 22 when distinguishing) is configured to be substantially linear. Also, although not explicitly shown in the figure, when this cover member 22 covers the reinforcing member 21, the surface of the shaft support plate portion 21a abuts against the inner surface of the center cover portion 22A, and the protruding edge of the side plate portion 21h abuts against the inner surface of the side cover portion 22B.

[0016] The cover member 22 is provided with a shaft insertion hole 22a, a projection housing portion 22b, and a screw insertion hole 22c. The shaft insertion hole 22a is provided in the center cover portion 22A in the portion corresponding to the shaft support hole 21d of the reinforcing member 21. The inner diameter of the shaft insertion hole 22a is configured to be approximately the same as the circumference formed by the sliding surface 21f of the projection 21e. Four fitting projections 22d are provided on the inner surface of the cover member 22 in the portion surrounding the shaft insertion hole 22a. The fitting projections 22d are configured to fit between the projections 21e inside the shaft support hole 21d when the reinforcing member 21 is covered with the cover member 22 with the shaft insertion hole 22a aligned with the shaft support hole 21d. The projection housing portion 22b is a recess provided on the inner surface of the center cover portion 22A in the portion corresponding to the support projection 21i of the reinforcing member 21. In the illustrated example, the projection housing portion 22b is provided in the portion located on the outdoor side relative to the shaft insertion hole 22a. The screw insertion holes 22c are provided in each side cover portion 22B in the portions corresponding to the screw insertion portion 21g and screw support portion 21k of the reinforcing member 21. These screw insertion holes 22c are configured such that the screw support portion 21k is exposed to the outside when the reinforcing member 21 is covered by the cover member 22. Furthermore, when the reinforcing member 21 is covered by the cover member 22, the cover member 22 and the screw support portion 21k are configured such that the protruding end face of the screw support portion 21k is located on substantially the same plane as the outer surface of the side cover portion 22B.

[0017] Furthermore, the cover member 22 is provided with a guide projection 22e on the outer surface of the center cover portion 22A. The guide projection 22e is a projection provided around the shaft insertion hole 22a and has a small diameter portion 22f, a large diameter portion 22g, and a guide groove 22h. The small diameter portion 22f constitutes a substantially arc-shaped circumferential surface provided such that the portion facing the outdoor side of the center cover portion 22A is convex. The large diameter portion 22g constitutes a substantially arc-shaped circumferential surface provided such that the portion facing the indoor side of the center cover portion 22A is convex. A regulating portion 22i is provided at the boundary between the small diameter portion 22f and the large diameter portion 22g. The regulating portion 22i is a plane extending radially from the shaft insertion hole 22a. An introduction projection 22j is provided on the outer circumference side of the regulating portion 22i, facing the portion facing the outdoor side. The guide groove 22h is a recess provided on the surface of the guide projection 22e, and is configured in a substantially arc shape centered on the shaft insertion hole 22a. In the illustrated example, the small diameter portion 22f and the guide groove 22h each have a central angle of approximately 240°, and the guide groove 22h is provided so as to be convex toward the indoor side, opposite to the small diameter portion 22f. In other words, as shown in Figure 13, when the outer part of the cover member 22 is facing upwards, the guide groove 22h is formed in the range from approximately 2 o'clock to approximately 10 o'clock on a clock face. For convenience, the end of the guide groove 22h at approximately the 2 o'clock position will be referred to as the locking end 22h1, and the end at approximately the 10 o'clock position will be referred to as the unlocking end 22h2.

[0018] The dish member 30 has a base portion 30a and a sickle portion 30b, and like the reinforcing member 21, it is integrally formed from a metal with higher fire resistance than aluminum alloy, such as stainless steel. The base portion 30a is flat and has a through hole 30c and a projection insertion hole 30d. The through hole 30c is formed to have approximately the same inner diameter as the shaft insertion hole 22a provided in the cover member 22. The projection insertion hole 30d is a notch continuous with the through hole 30c and forms a fan shape centered on the through hole 30c. The central angle of this projection insertion hole 30d is approximately 60°, and it is formed so that when the through hole 30c is aligned with the shaft insertion hole 22a of the cover member 22, its outer diameter is approximately the same as the guide groove 22h of the cover member 22. The base portion 30a is provided with a roughly arc-shaped outer edge 30e for the sickle centered on the through hole 30c. The sickle outer edge 30e is configured to protrude outward from the outer part of the cover member 22 when the through hole 30c is aligned with the shaft insertion hole 22a of the cover member 22. In the illustrated example, when the projection insertion hole 30d is positioned in the guide groove 22h of the cover member 22 to align with the locking end 22h1 (hereinafter referred to as the locking position of the dish member 30), the dish member 30 is configured such that the sickle outer edge 30e protrudes outward from the outer part of the cover member 22. The sickle portion 30b is a substantially arc-shaped projection that rises from the sickle outer edge 30e. The projection dimension of the sickle portion 30b from the base portion 30a is set to increase sequentially in a clockwise direction. In the following, for convenience, the end of the sickle portion 30b that protrudes less from the base portion 30a may be referred to as the starting end 30b1 of the sickle portion 30b, and the end that protrudes more from the base portion 30a may be referred to as the ending end 30b2 of the sickle portion 30b.

[0019] Furthermore, the base portion 30a of the plate member 30 is provided with a pin insertion hole 30f, a restrictive notch 30g, and a shaft support portion 30h. The pin insertion hole 30f is provided on the unlocking end 22h2 side in the portion that is on the indoor side of the through hole 30c when the plate member 30 is in the locked position. The restrictive notch 30g is formed from the portion that is on the indoor side of the through hole 30c and on the locked end 22h1 side when the plate member 30 is in the locked position, to a position corresponding to the outer peripheral edge 30e for the hook of the small diameter portion 22f. The shaft support portion 30h is formed in the portion that surrounds the through hole 30c between the through hole 30c and the hook portion 30b, and protrudes from the surface of the base portion 30a in the same direction as the hook portion 30b. In this embodiment, the shaft support portion 30h is provided in a stepped shape by cutting and bending from the through hole 30c. A sliding contact portion 30i is provided at the protruding end of the shaft support portion 30h. The sliding contact portion 30i is arc-shaped and is provided to match the inner circumferential surface of the through hole 30c. The base end portion of this shaft support portion 30h, which is cut up from the base plate portion 30a, is provided to be in a position facing the projection housing portion 22b when the dish member 30 is positioned in the locked position relative to the cover member 22.

[0020] The shaft member 40 has a small diameter portion 40a, a large diameter portion 40b, and a fitting portion 40c, and is integrally formed by forging from a metal with higher fire resistance than aluminum alloy, such as stainless steel. In the illustrated example, the shaft member 40 is configured such that the axial dimension of the small diameter portion 40a is larger than that of the large diameter portion 40b and the fitting portion 40c. The small diameter portion 40a is cylindrical in shape with an outer diameter approximately the same as the circumference formed by the sliding surface 21f of the protrusion 21e provided on the reinforcing member 21. The large diameter portion 40b is columnar in shape with a circular cross-section and is provided at one end of the small diameter portion 40a with their axes aligned. This large diameter portion 40b has a larger outer diameter than the small diameter portion 40a and forms an annular stepped portion 40d of a certain width between it and the small diameter portion 40a. The large diameter portion 40b is also provided with a flange portion 40e. The flange portion 40e protrudes outward from the end of the large-diameter portion 40b opposite to the stepped portion 40d, and has a roughly square cross-section. The length of one side of the flange portion 40e is set to be slightly larger than the outer diameter of the large-diameter portion 40b. The fitting portion 40c has a roughly square cross-section and is provided at the other end of the small-diameter portion 40a with their axes aligned. The fitting portion 40c is set so that its diagonal is less than or equal to the outer diameter of the small-diameter portion 40a, and forms four backing plate contact surfaces 40f between it and the small-diameter portion 40a.

[0021] An operating handle 41 is attached to the aforementioned shaft member 40. The operating handle 41 is a long, elongated piece molded from resin, with the shaft member 40 provided on the inner surface side of one end. More specifically, the shaft member 40 is embedded in the inner surface of one end of the operating handle 41 via a flange portion 40e and a large diameter portion 40b, while the small diameter portion 40a and the fitting portion 40c are exposed to the outside, so as to be integrated with the operating handle 41. The axis of the shaft member 40 is approximately perpendicular to the longitudinal side of the operating handle 41.

[0022] The operating handle 41 is provided with a substrate contact surface 41a, a fitting projection 41b, a contact recess 41c, a lever step 41d, and a pin mounting hole 41e in the portion surrounding the shaft member 40. The substrate contact surface 41a is a plane that contacts the substrate portion 30a of the dish member 30 when the small diameter portion 40a of the shaft member 40 is passed through the through hole 30c of the dish member 30, and extends along a direction perpendicular to the axis of the shaft member 40. The fitting projection 41b is a projection provided to fit into the projection insertion hole 30d of the dish member 30 when the small diameter portion 40a of the shaft member 40 is passed through the through hole 30c of the dish member 30. This fitting projection 41b is provided integrally with the operating handle 41 so as to protrude from the other end of the operating handle 41 relative to the shaft member 40. The protrusion dimension of the fitting projection 41b from the substrate contact surface 41a is set to be greater than the thickness of the substrate portion 30a and smaller than the protrusion dimension of the narrow diameter portion 40a. The recess 41c for the contact portion is for accommodating the shaft support portion 30h provided on the dish member 30 when the fitting projection 41b is fitted into the projection insertion hole 30d of the dish member 30, and is provided so that the stepped portion 40d of the shaft member 40 can be exposed to the outside. The stepped portion 41d for the lever is a recess provided to be one step lower than the substrate contact surface 41a, and is provided in the portion of the dish member 30 opposite the area where the pin insertion hole 30f and the restrictive notch 30g are provided when the fitting projection 41b is fitted into the projection insertion hole 30d of the dish member 30. The pin insertion hole 41e is a circular recess in the portion of the dish member 30 that faces the pin insertion hole 30f when the fitting projection 41b is fitted into the projection insertion hole 30d of the dish member 30. In the illustrated example, the pin insertion hole 41e is provided so as not to penetrate the outer surface of the operating handle 41.

[0023] To assemble the crescent 12 using the components described above, the detection lever (detection member) 50 is interposed between the lever step portion 41d of the operating handle 41 and the base portion 30a of the dish member 30. Then, the narrow diameter portion 40a of the shaft member 40 protruding from the operating handle 41 is sequentially passed through the through hole 30c of the dish member 30, the shaft insertion hole 22a of the cover member 22, and the shaft support hole 21d of the reinforcing member 21. After that, the backing plate 42 is passed through the fitting portion 40c of the shaft member 40 and crimped. In this state, the shaft support portion 30h provided on the dish member 30 protrudes toward the step portion 40d of the shaft member 40 and can contact the step portion 40d. It is preferable to use a backing plate 42 made of stainless steel.

[0024] The detection lever 50 has a contact end 50a and a restricting end 50b, and a pin hole 50c in the middle of these. The detection lever 50 can rotate around the axis of the pin member 51 relative to the dish member 30 by mounting a pin member 51 that passes through the pin hole 50c between the pin insertion hole 30f and the pin mounting hole 41e. The contact end 50a extends from the pin member 51 in a direction approaching the starting end 30b1 of the sickle portion 30b, and has an inner contact portion 50d at the extended end. The inner contact portion 50d is provided so as to protrude from the contact end 50a of the detection lever 50 in the same direction as the sickle portion 30b. The inner contact portion 50d is configured to protrude from the base portion 30a of the sickle portion 30b when the contact end 50a of the detection lever 50 rotates toward the outer circumference relative to the dish member 30, and to be positioned on the extension of the starting end 30b1. On the other hand, when the contact end 50a rotates toward the inner circumference, it is configured to be housed on the surface of the base portion 30a in a position on the inner circumference side of the sickle portion 30b. The regulating end 50b extends in a direction offset by approximately 180° from the contact end 50a with respect to the pin member 51, and has a regulating projection 50e at the extended end. The regulating projection 50e protrudes from the regulating end 50b of the detection lever 50 in the opposite direction to the inner contact portion 50d, and its protruding end protrudes beyond the back surface of the base portion 30a. The restricting projection 50e is positioned close to the through hole 30c via a restricting notch 30g provided in the base portion 30a when the restricting end 50b of the detection lever 50 rotates toward the inner circumference relative to the plate member 30. Conversely, when the restricting end 50b rotates toward the outer circumference, the distance from the axis of the through hole 30c is configured to be greater than or equal to the radius of the large diameter portion 22g provided in the cover member 22. A biasing spring 52 is provided between the detection lever 50 and the operating handle 41. The biasing spring 52 constantly biases the contact end 50a of the detection lever 50 so that it rotates toward the outer circumference. Reference numeral 43 in the figure indicates a position restricting spring interposed between the backing plate 42 and the cover member 22. The position restricting spring 43 is used to hold the plate member 30 in either the locked or unlocked position relative to the base 20.

[0025] In the crescent 12 assembled as described above, the sliding surface 21f of the projection 21e provided in the shaft support hole 21d of the reinforcing member 21 abuts against the narrow diameter portion 40a of the shaft member 40, thereby allowing the operating handle 41 to rotate around the axis of the shaft member 40 relative to the base 20 via the shaft member 40. At this time, since the fitting projection 41b provided on the operating handle 41 is fitted into the projection insertion hole 30d of the dish member 30, the operating handle 41 and the dish member 30 rotate together with respect to the base 20. However, the fitting projection 41b of the operating handle 41 penetrates the base portion 30a of the dish member 30 and is inserted into the guide groove 22h provided in the cover member 22. For this reason, the rotation range of the operating handle 41 and the dish member 30 is limited to approximately 180° by the guide groove 22h and the fitting projection 41b. In other words, the operating handle 41 and the plate member 30 can rotate from a state in which the guide projection 22e is in contact with the locking end 22h1 of the guide groove 22h to a state in which the guide projection 22e is in contact with the unlocking end 22h2 of the guide groove 22h. For convenience, in the following, the direction in which the guide projection 22e rotates toward the locking end 22h1 of the guide groove 22h may be referred to as the locking direction, and the direction in which it rotates toward the unlocking end 22h2 of the guide groove 22h may be referred to as the unlocking direction.

[0026] In the crescent lock 12 described above, the detection lever 50 is biased by the biasing spring 52 so that the contact end 50a rotates toward the outer circumference. Therefore, when the fitting projection 41b of the operating handle 41 is positioned to align with the unlocking end 22h2 of the guide groove 22h (hereinafter referred to as the unlocked position of the pan member 30), the regulating projection 50e of the detection lever 50 comes into contact with the small diameter portion 22f of the cover member 22 via the regulating notch 30g. As a result, if the pan member 30 is locked and rotated via the operating handle 41 while in this state, the regulating projection 50e of the detection lever 50 will come into contact with the regulating portion 22i, preventing further rotation in the locking direction. On the other hand, if the regulating projection 50e of the detection lever 50 is kept positioned on the outer circumference against the biasing force of the biasing spring 52, and the operating handle 41 is rotated in the locking direction in this state, it becomes possible to position the regulating projection 50e on the circumferential surface of the large diameter portion 22g beyond the introduction projection 22j, and the fitting projection 41b of the operating handle 41 can be brought into contact with the locking end portion 22h1. Furthermore, from the state in which the fitting projection 41b is in contact with the locking end portion 22h1, the operating handle 41 can be rotated in the unlocking direction without any restriction until the fitting projection 41b comes into contact with the unlocking end portion 22h2.

[0027] During the operation described above, in the crescent 12, the detection lever 50 is positioned in the part corresponding to the narrow diameter portion 40a of the shaft member 40, so there is no concern that they will interfere with each other. Moreover, the shaft support portion 30h provided on the disc member 30 protrudes toward the stepped portion 40d of the shaft member 40 and is in contact with the stepped portion 40d. Therefore, there is no risk of the disc member 30 becoming loose in the axial direction of the shaft member 40. In addition, the shaft member 40 is rotationally symmetrical and can be manufactured without requiring any further processing such as cutting after it has been formed by forging. That is, the narrow diameter portion 40a and the wide diameter portion 40b of the shaft member 40 both have a uniform circular cross-section, and the fitting portion 40c and the flange portion 40e both have a uniform square cross-section. This not only simplifies the manufacturing process of the shaft member 40, but also simplifies the assembly process because it eliminates the need to position the shaft member 40 in the rotational direction when attaching it to the operating handle 41.

[0028] The crescent lock 12 described above is positioned on the outer surface of the inner meeting frame 2Bc with the outer part of the cover member 22 facing the outside. From this state, the crescent lock 12 is attached to the inner sash 2B by screwing the mounting screw S into the inner meeting frame 2Bc via the screw insertion hole 22c of the cover member 22 and the screw insertion portion 21g of the reinforcing member 21. It is preferable to use a mounting screw S made of a metal such as stainless steel, similar to the shaft member 40. In this state, the support leg portion 21j of the reinforcing member 21 abuts against the surface of the inner meeting frame 2Bc, and the screw support portion 21k provided on the side plate portion 21h of the reinforcing member 21 abuts against the head Sb of the mounting screw S. Furthermore, when the countersunk member 30 is in the locked position, the support projection 21i provided on the reinforcing member 21 is positioned opposite to the base end portion of the shaft support portion 30h via the projection housing portion 22b of the cover member 22.

[0029] Therefore, even if the cover member 22 melts or burns away when exposed to high temperatures, such as during a fire, as shown in Figure 14, there is no risk of fire spreading due to the detachment of the countersunk member 30. In other words, as described above, the reinforcing member 21, the shaft member 40, the countersunk member 30, and the mounting screws S are made of highly fire-resistant metals such as stainless steel, so they do not melt or burn away even when exposed to high temperatures. As a result, the screw support portion 21k is kept in contact with the head Sb of the mounting screws S, so there is no risk of the reinforcing member 21 detaching from the inner meeting frame 2Bc. In addition, the countersunk member 30 interposed between the outer sash 2A and the inner sash 2B is subjected to an external force that presses against the hook portion 30b via the crescent receiver 11 due to the thermal deformation of both 2A and 2B. However, since the base portion 30a of the dish member 30 is supported via the support projection 21i and the support leg portion 21j, the state in which it is supported by the reinforcing member 21 via the shaft member 40 is maintained. In particular, since the support leg portion 21j is provided in close proximity to the support projection 21i, there is no concern that the shaft support plate portion 21a of the reinforcing member 21 will bend, and the dish member 30 is more reliably supported by the reinforcing member 21.

[0030] Incidentally, during normal use, the outer sash 2A and inner sash 2B are positioned to close the opening of the frame 1, and when the crescent receiver 11 provided on the outer meeting stile 2Ac and the dish member 30 of the crescent 12 provided on the inner meeting stile 2Bc can engage, rotating the dish member 30 from the unlocked position to the locked position via the operating handle 41 causes the inner contact portion 50d to contact the crescent receiver 11, causing the detection lever 50 to rotate against the biasing force of the biasing spring 52, and the regulating projection 50e to be positioned on the outer circumference. Therefore, by operating the operating handle 41 in this manner, it is possible to rotate the dish member 30 to the locked position and engage the hook portion 30b with the crescent receiver 11, thereby locking the door.

[0031] In contrast, if the operating handle 41 is operated while at least one of the outer sash 2A and the inner sash 2B is not in the closed position, the crescent receiver 11 does not come into contact with the inner contact portion 50d. As a result, the restricting projection 50e of the detection lever 50 remains in contact with the small diameter portion 22f of the cover member 22 via the restricting notch 30g. Therefore, even if the operating handle 41 is operated in this state, the restricting projection 50e of the detection lever 50 comes into contact with the restricting portion 22i, preventing further rotation in the locking direction. This allows the operator to realize that the hook portion 30b of the plate member 30 and the crescent receiver 11 are not engaged, and there is no risk of mistakenly believing that the locking device 10 is locked, which is advantageous in terms of usability.

[0032] In the embodiments described above, sliding windows are used as examples, but the present invention is not limited to this, and can also be applied to single-sliding windows, for example, in which only one of the outer or inner sashes slides. In this case, in a single-sliding window where only the outer sash slides, the vertical frame and mullion of the fixed window become the profiles to which the base is attached, and conversely, in a single-sliding window where only the inner sash slides, the vertical frame of the inner sash becomes the profile to which the base is attached.

[0033] As described above, the locking device according to the present invention comprises a base attached to one profile, a shaft member rotatably supported on the base via its tip, a plate member having a through hole in its base and a hook portion around a part of the base centered on the through hole, and the shaft member passing through the through hole, thereby rotatably supported on the base together with the shaft member, and a receiving member provided on the other profile, wherein when the plate member is rotated from a predetermined unlocked position to a locked position relative to the base, the hook portion can engage with the receiving member, thereby restricting the relative movement between the one profile and the other profile, wherein the shaft member is provided with a smaller diameter portion that is smaller in diameter than the larger diameter portion at the base end, and the plate member is provided with a shaft support portion that protrudes toward a stepped portion formed between the smaller diameter portion and the larger diameter portion of the shaft member. According to this invention, the base portion of the disc member is provided with a shaft support portion that protrudes toward the stepped portion, allowing the shaft support portion to abut against the stepped portion, and enabling the thin diameter portion and the thick diameter portion of the shaft member to be configured to have circular cross-sections. Therefore, not only is it possible to manufacture the shaft member without requiring additional processing, but it is also unnecessary to position the shaft member and the disc member in the rotational direction during assembly, thereby simplifying manufacturing and assembly work.

[0034] Furthermore, the present invention is characterized in that, in the locking device described above, the shaft support portion is integrally formed with the substrate portion by cutting and raising a part of the substrate portion. According to this invention, it is possible to provide a shaft support portion by cutting and bending the substrate portion.

[0035] Furthermore, the present invention is characterized in that, in the locking device described above, the shaft support portion is provided in the base plate portion in a portion located between the through hole and the hook portion. According to this invention, the shaft support portion abuts against the stepped portion of the shaft member on the side of the plate member where the sickle portion is provided.

[0036] Furthermore, the present invention provides a locking device as described above, wherein the base comprises a reinforcing member that rotatably supports the shaft member and a cover member provided to cover the outer surface of the reinforcing member, and is attached to the one profile by screwing mounting screws to the one profile via the cover member and the reinforcing member, and the reinforcing member is provided with a support projection that protrudes toward the plate member in the portion corresponding to the shaft support when the plate member is positioned in the locked position. According to this invention, when the dish member is positioned in the locked position, the support projection of the reinforcing member is positioned corresponding to the shaft support portion. Therefore, even if the cover member melts or burns away in the event of a fire, for example, the external force applied to the dish member via the receiving member is absorbed by the reinforcing member via the shaft support portion and the support projection.

[0037] Furthermore, the present invention is characterized in that, in the locking device described above, the reinforcing member is provided with a support leg that is interposed between the one shaped member and the portion corresponding to the shaft support when the plate member is positioned in the locked position. According to this invention, when the dish member is positioned in the locked position, the support projections and support legs of the reinforcing member are positioned in correspondence with the shaft support portion. For example, even if the cover member melts or burns away in the event of a fire, the external force applied to the dish member via the receiving member is absorbed by the reinforcing member via the shaft support portion and support projections, and further absorbed by one of the profiles via the support legs.

[0038] Furthermore, the present invention is characterized in that, in the locking device described above, the reinforcing member is provided with a screw support portion that is exposed to the outside of the cover member and contacts the head of the screwed mounting screw. According to this invention, even if the cover member melts or burns away in the event of a fire, the screw support portion remains in contact with the head of the mounting screw, thus eliminating the risk of the mounting screw becoming loose.

[0039] Furthermore, the joinery according to the present invention is characterized in that the aforementioned locking device is attached to the frame of the sliding door. According to this invention, the base portion of the disc member is provided with a shaft support portion that protrudes toward the stepped portion, allowing the shaft support portion to abut against the stepped portion, and enabling the thin diameter portion and the thick diameter portion of the shaft member to be configured to have circular cross-sections. Therefore, not only is it possible to manufacture the shaft member without requiring additional processing, but it is also unnecessary to position the shaft member and the disc member in the rotational direction during assembly, thereby simplifying manufacturing and assembly work. [Explanation of symbols]

[0040] 2A Outer sash, 2B Inner sash, 2Ac Outer meeting stile, 2Bc Inner meeting stile, 10 Locking device, 11 Crescent receiver, 20 Base, 21 Reinforcement member, 21i Support projection, 21j Support leg, 21k Screw support part, 22 Cover member, 30 Countersunk member, 30a Base plate, 30b Hook part, 30c Through hole, 30h Axle support part, 40 Axle member, 40a Small diameter part, 40b Large diameter part, 40d Step part, 50 Detection lever, S Mounting screw, Sb Head

Claims

1. A base that is attached to one of the profile members, A shaft member rotatably supported on the base via its tip, A disc member having a through hole in the substrate portion and a sickle portion around a part of the substrate portion centered on the through hole, and the shaft member passing through the through hole, thereby being rotatably supported with respect to the base together with the shaft member, A receiving member provided on the other profile and A locking device comprising the following, wherein when the plate member is rotated from a predetermined unlocked position to a locked position relative to the base, the hook portion becomes capable of engaging with the receiving member, and the relative movement between one profile and the other profile is restricted, The shaft member is provided with a smaller diameter portion that is smaller in diameter than the larger diameter portion at the base end. The locking device is characterized in that the plate member has a shaft support portion that protrudes toward the stepped portion formed between the narrow diameter portion and the wide diameter portion of the shaft member.

2. The locking device according to claim 1, characterized in that the shaft support portion is integrally formed with the substrate portion by cutting and raising a part of the substrate portion.

3. The locking device according to claim 1, characterized in that the shaft support portion is provided in the substrate portion in a portion located between the through hole and the hook portion.

4. The base comprises a reinforcing member that rotatably supports the shaft member and a cover member provided to cover the outer surface of the reinforcing member, and is attached to the one profile by screwing mounting screws into the one profile via the cover member and the reinforcing member. The locking device according to claim 3, characterized in that the reinforcing member is provided with a support projection that protrudes toward the plate member in the portion corresponding to the shaft support portion when the plate member is positioned in the locked position.

5. The locking device according to claim 4, characterized in that the reinforcing member is provided with a support leg that is interposed between it and one of the shaped members in the portion corresponding to the shaft support when the plate member is positioned in the locked position.

6. The locking device according to claim 4, characterized in that the reinforcing member is provided with a screw support portion that is exposed to the outside of the cover member and contacts the head of the screwed mounting screw.

7. A building fixture characterized in that a locking device described in any one of claims 1 to 6 is attached to the frame of a sliding door.

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