JP5631582B2 - Joinery and picture frames - Google Patents

Description

The present invention relates to a joinery configured to fix a joinery frame to a building opening and to fix an angle provided on the indoor side of the joinery frame to a frame, and a frame used for the joinery .

  In a joinery frame made of a conventional sash frame, an angle portion is generally fixed to a frame with screws. However, according to such a fixing structure with screws, fixing work with about 20 screws is required to fix one joinery frame to the building opening, which requires labor and time, and the head of the screw is There is a problem that it looks bad because it appears on the outside. In addition, since the fixing is performed with a large number of screws, there is a problem in that the angle may be wavy due to variations in construction.

  Various proposals have been made to solve such problems. In Patent Document 1, as shown in FIG. 9 (A), a bifurcated portion 51a at the upper part of an angle 51 is fitted on the outdoor side of the frame 50, covered with a resin cover 52 on the angle 51, and between the two A device in which a gap 53 is formed is proposed.

  In Patent Document 2, as shown in FIG. 9B, a frame attachment piece 61 is attached to an existing joinery frame 60, and a frame attachment auxiliary member 63 provided on the frame 62 is fitted to the frame attachment piece 61. There has been proposed one in which the anchor 65 welded to the frame 64 is also welded to the frame attachment auxiliary member 63 and the frame 62 is attached to the joinery frame 60.

  In Patent Document 3, as shown in FIG. 9C, a cover is covered with a cover 74 on the surface of an angle portion 72 that is fixed to a frame 70 with a screw 71 and the head of the screw 71 is hidden.

JP 2007-146536 A JP 2001-82032 A JP 2004-360322 A

  Among the above-described conventional joinery frames, the one described in Patent Document 1 has no means for restricting the movement of the frame 51 in the indoor / outdoor direction with respect to the frame 50, so If this is applied to a frame having a step portion 50a on the surface of the frame 50 as shown in the figure, a gap 54 may be formed between the step portion 50a and the cover 52, which may impair the design. Moreover, since the rising dimension from the frame 50 of the cover 52 is large, there is a possibility that the designability is impaired.

  Moreover, the thing of patent document 2 requires the frame attachment piece 61, the auxiliary member 63 for frame attachment, and the anchor 65, and also the number of parts increases and a manufacturing cost becomes high, and the man-hour of joinery frame construction increases, There is a problem that the construction cost becomes high.

  Moreover, although the head of the screw 71 is hidden by the cover 74 in the thing of patent document 3, since the screw 71 is used for the fixation to the frame 70 of the angle part 72, labor and time are required for joinery frame construction. The problem of need is not solved.

In view of the above problems, the present invention can fix the angle and the frame with a small number of parts, and can easily perform the construction of the joinery frame in a short time, and the joinery with improved design and the frame used for the joinery. The purpose is to provide.

The joinery of claim 1 is a joinery frame fixedly provided in a building opening,
An angle forming a substantially U-shaped portion that is configured to form an indoor side portion of the joinery frame and is fitted to an outdoor side of a frame provided in the building opening;
The substantially U-shaped part has a first part located on the prospective surface side of the building opening, a part separate from the first part, and a part that covers the surface of the frame. And a second part that sandwiches the frame between them,
The first part and the second part are fitted with an engaging part extending from the first part to the second part side on the outdoor side of the frame, thereby forming the substantially U-shaped part. And fixing with a fixture at the place where the first part and the second part are combined,
The outdoor side end face of the frame is made to face a surface including the engaging part among the inner faces of the substantially U-shaped part formed by the first part and the second part,
The second part of the first part is provided on the facing part of the second part so as to protrude toward the second part side, and engages with a groove provided on the frame to restrict the movement of the frame in the indoor direction with respect to the angle. It is characterized by comprising two engaging portions.

The joinery of claim 2 is the joinery of claim 1,
The first part is constituted by an aluminum alloy extruded shape, and the second part is constituted by a synthetic resin extruded shape .

The fitting according to claim 3 is the fitting according to claim 1 or 2,
The second engaging portion is formed of a protrusion having elasticity formed in a cut-and-raised shape.

The fitting according to claim 4 is the fitting according to claim 1 or 2,
The second engaging portion is formed of a rising portion formed by extrusion molding.

The fitting according to claim 5 is the fitting according to any one of claims 1 to 4,
A step portion is formed by recessing the outdoor side of the frame surface, and the second portion is brought into contact with the recessed portion of the frame to form the surface of the second portion and the frame surface in the same plane. In addition, the indoor side end portion of the second portion is brought into contact with the stepped portion.

The frame of claim 6 is a frame attached to the joinery according to any one of claims 1 to 5,
The frame is provided on the second portion facing portion of the first portion so as to protrude toward the second portion, and engages with a second engagement portion that restricts the movement of the frame in the indoor direction with respect to the angle. It features a possible groove.

The frame of claim 7 is the frame of claim 6,
A step portion facing the indoor side end portion of the first portion is provided in a portion of the frame covering the prospective surface of the first portion.

The joinery of claim 8 is a joinery frame fixed to the building opening,
An angle forming a substantially U-shaped portion that is configured to form an indoor side portion of the joinery frame and is fitted to an outdoor side of a frame provided in the building opening;
The substantially U-shaped part forms a part of the joinery frame, covers a prospective surface of a frame, separates from the first part, and has a part facing the first part on the indoor side. And a second part that sandwiches a frame with the first part,
The second part includes an engaging part combined with the first part,
The second part is engaged with the first part by an engaging part formed to extend from the first part to the second part side, thereby forming the substantially U-shaped part and the second part. 1 part and the second part are combined with each other, and fixed by a fixing tool on the outdoor side of the frame,
The outdoor side end surface of the frame is made to face a surface including the engagement portion among the inner surfaces of the substantially U-shaped portion formed by the first portion and the second portion.

According to the first aspect of the present invention, since the interior side of the angle is formed in a U-shape that fits the outside of the frame, movement in the joinery surface direction with respect to the angle of the frame is restricted. Further, the movement in the indoor direction with respect to the angle of the frame is restricted by the engaging portion provided on the inner surface of the angle U-shaped portion. For this reason, the angle and the frame can be fixed to each other without using a screw. With this structure, the angle and the frame can be fixed with a small number of parts, and the fitting frame can be easily constructed in a short time, and the design can be improved.

  Further, since the groove to be engaged with the engaging portion provided at the angle is provided in the frame, the angle and the frame can be fixed to each other by pressing the frame into the U-shaped portion and fitting the engaging portion into the groove. Providing a groove in the frame is a simple process or molding and can be carried out relatively inexpensively.

According to the invention of claim 2, since the second part provided on the side of the shoji mounting surface of the window frame is made of the extruded shape made of synthetic resin, it is possible to improve dew proofing.

  According to the invention of claim 3, since the second engaging portion is formed by cutting and raising, it is possible to realize a structure in which the frame can be easily inserted into the U-shaped portion with respect to the angle and the frame is less likely to come off from the angle. In addition, since the second engaging portion is formed by cutting and raising, the raising portion is partially raised without increasing the number of parts, so that the engaging portion is inserted when the frame is inserted into the angle. It is easily elastically deformed and can be easily fitted to the U-shaped part of the frame. Further, the frame is pushed by the elasticity obtained by cutting and raising, and the prospective surface portion on the surface side of the angle is pressed against the surface of the frame, so that the design is improved.

  According to the fourth aspect of the present invention, since the rising portion formed by extrusion molding is the second engagement portion, the engagement portion can be formed in the extrusion molding process. For this reason, a separate process for processing the second engaging portion is not required, and the number of processes can be simplified.

  According to the fifth aspect of the present invention, since the indoor side end portion of the angle is brought into contact with the step portion of the frame, the position of the frame toward the outdoor side is regulated, and the relationship between the engaging portion of the U-shaped portion and the frame is established. At the same time, the two can be firmly coupled, and the angle surface and the frame surface are flush with each other, so that the design is improved.

It is a longitudinal cross-sectional view which shows one Embodiment of the fitting of this invention. It is a cross-sectional view of FIG. FIG. 3 is a partially enlarged sectional view of FIG. 2. It is a cross-sectional view which shows other embodiment of this invention. It is a cross-sectional view showing another reference example of the present invention. It is a cross-sectional view showing another usage pattern of the embodiment of FIGS. It is a cross-sectional view which shows other embodiment of this invention. It is a cross-sectional view which shows other embodiment of this invention. (A)-(C) are sectional drawings explaining a prior art, respectively.

  FIG. 1 is a longitudinal sectional view showing an embodiment of the joinery of the present invention with the shoji omitted, and FIG. 2 is a transverse sectional view thereof. Reference numeral 1 denotes a joinery frame fixed to the building opening 2, and a shoji (not shown) is attached to the inside thereof. The building opening 2 includes a window sill 3, a lintel 4, and left and right pillars 5 and 5. The joinery frame 1 includes a lower frame 6, an upper frame 7, and left and right vertical frames 8 and 8. These frames 6 to 8 are formed by using an aluminum alloy extruded profile as a basic material. The joinery frame 1 of this example is illustrated by taking an example of a sliding window having rails 6a and 7a for sliding door sliding (not shown) on the lower frame 6 and the upper frame 7, respectively.

  The joinery frame 1 is assembled by screwing tapping screws inserted into holes (not shown) provided in the vertical frames 8 and 8 into tapping holes 6 b and 7 b provided in the lower frame 6 and the upper frame 7. Then, the assembled joinery frame 1 is attached to the building opening 2 with spacers 10 to 12 with a vertical degree. That is, the vertical pieces 6c and 6d provided on the lower surface on the indoor side of the lower frame 6 are placed on the window base 3, and between the attachment pieces 6e of the lower frame 6 and the window base 3, the attachment pieces 7e of the upper frame 7 and the lintel 4 In the meantime, spacers 10, 11, 12 having respective thicknesses are interposed between the mounting pieces 8 e of the vertical frame 8 and the columns 5, and the window base 3 is fixed by fixtures 13, 14, 15 such as nails and screws, respectively. The lower frame 6, the upper frame 7, and the vertical frame 8 are fixed to the lintel 4 and the pillar 5. In addition, angles 6f, 7f, and 8f are provided on the indoor sides of the frames 6, 7, and 8, respectively. The indoor sides of the angles 6f, 7f, and 8f are U-shaped so as to be fitted to the outdoor sides of the frames 16, 17, and 18, respectively. Cay trees 20 and 21 are interposed between the angles 7f and 8f and the lintel 4 and the pillar 5, and the portions of the angles 7f and 8f are fixed to the lintel 4 and the pillar 5 by fixing tools 22 and 23 such as nails or screws. To do. The frames 16, 17, 18 are made of gypsum board or structural plywood.

Each angle 6f, 7f, 8f may be formed only of an extruded shape made of aluminum alloy. However, in this embodiment, each angle 6f, 7f, 8f is combined with the first part 6g, 7g, 8g made of an aluminum alloy extruded shape and the first part 6g, 7g, 8g, respectively. The second part 6h, 7h, 8h made of a resin extruded shape is used to improve dew proofing. The combination of the first part 6g, 7g, 8g and the second part 6h, 7h, 8h is such that they are fitted to each other in the outdoor engagement part a provided on the side of the shoji mounting surface outside the frame. The indoor side engaging portion b formed by extending from the first portions 6g, 7g, 8g to the second portions 6h, 7h, 8h (the engaging portions a, b are referred to as first engaging portions). Is performed by fitting the second portion 6h, 7h, 8h. A substantially U-shaped part is formed by such a combined structure of the first parts 6g, 7g, 8g and the second parts 6h, 7h, 8h . The fixtures 22 and 23 are provided on the outdoor side of the frame, at a place where the first parts 6g, 7g, and 8g and the second parts 6h, 7h, and 8h are combined, and serve to fix the two parts.

The portions 6g, 7g, 8g made of aluminum alloy extruded shapes at the respective angles 6f, 7f, 8f are located on the prospective surface side of the building opening, and are the rear surfaces of the frames 16, 17, 18 (window base 3, lintel respectively. 4, surfaces facing the pillar 5 side) and prospective surface portions 6i, 7i, 8i. These prospective surface portions 6i, 7i, and 8i have engaging portions (second engaging portions) 6j that protrude on the frame 16, 17, and 18 side, that is, on the synthetic resin extruded shapes 6h, 7h, and 8h side, respectively. 7j and 8j are provided. In this example, a plurality of the engaging portions 6j, 7j, and 8j are formed so as to protrude obliquely with respect to the back surfaces of the frames 16, 17, and 18 by cutting and raising. Since these engaging portions 6j, 7j, and 8j are formed by cutting and raising, they have elasticity. On the other hand, grooves 16a, 17a, and 18a into which the engaging portions 6j, 7j, and 8j are fitted are provided on the back surfaces of the frames 16, 17, and 18, respectively. On the indoor side of the grooves 16a, 17a, 18a, as represented by the groove 18a in FIG. 3, a step portion 18x that faces the indoor side end portion of the prospective surface portion 8i and restricts the movement of the frame in the outdoor direction. Have

  The synthetic resin extruded shapes 6h, 7h, and 8h have prospective surface portions 6k, 7k, and 8k that cover the surfaces of the frames 16, 17, and 18, respectively. On the other hand, step portions 16b, 17b, and 18b are formed on the outdoor side of the surfaces of the frames 16, 17, and 18 by recessing the surface. FIG. 3 shows the relationship between the frame 18 and the angle 8 f of the vertical frame 8 in an enlarged manner.

  Reference numeral 24 is a chi-wood interposed between the window sill 3 and the frame 16, 25 is a chi-wood interposed between the lintel 4 and the frame 17, and 26 is a room for the window sill 3, the lintel 4 and the pillar 5. Interior material provided on the inner side, 27 is a trunk edge, 29 is a waterproof sheet affixed to the indoor side surface of the trunk edge 27, 30 is a heat insulating material provided between the waterproof sheet 29 and the interior material 26, and 31 is a trunk An exterior material provided on the outer surface of the edge 27, 32 is a sealing material that fills a gap between the exterior material 31 and the joinery frame 1, and 33 is a backup material for the sealing material 32.

In this joinery, the fixture frame 1 fixed to the building opening 2 is fixed to the angles 6f, 7f, and 8f as follows. In attaching the frames 16, 17, and 18, the chi woods 25, 26, and 21 are fixed in advance between the angles 6 f, 7 f, and 8 f and the window base 3, the lintel 4, and the pillar 5, respectively. The frames 16, 17, and 18 are fitted by being pushed into the U-shaped portions of the angles 6f, 7f, and 8f from the indoor side. At this time, the grooves 16a, 17a, and 18a of the frames 16, 17, and 18 are fitted and engaged with the engaging portions 6j, 7j, and 8j of the angle. Further, the synthetic resin extruded shapes 6h, 7h, 8h are brought into contact with the step portions 16b, 17b, 18b of the frames 16, 17, 18 respectively to make the synthetic resin extruded shapes 6h, 7h, 8h. Is formed on the same plane as the surfaces of the frames 16, 17, and 18. At the same time, the back surfaces of the frames 16, 17 and 18 are bonded to the chi woods 25, 26 and 21. Thus, in a state where the frames 16, 17, and 18 are fitted to the substantially U-shaped portion, the outdoor side end surfaces of the frames 16, 17, and 18 are the inner side engaging portions b of the inner surface of the approximately U-shaped portion. Face the containing surface .

  According to the joinery frame 1 of this embodiment, the angles 6f, 7f, and 8f are formed in a U-shape that fits to the outside of the frames 16, 17, and 18, so the angles 6f and 7f of the frames 16, 17, and 18 are formed. , 8f is restricted to move in the in-plane direction. Further, the indoor and outdoor movements of the frames 16, 17, 18 are restricted by the engaging portions 6j, 7j, 8j provided on the inner surface of the U-shaped portion of the angles 6f, 7f, 8f. For this reason, the angles 6f, 7f, 8f and the frames 16, 17, 18 can be fixed to each other without using screws. With this structure, the angles 6f, 7f, and 8f and the frames 16, 17, and 18 can be fixed with a small number of parts, and the construction of the joinery frame can be easily performed in a short time, and the design can be improved.

  In this embodiment, since the grooves 16a, 17a, 18a to be engaged with the engaging portions 6j, 7j, 8j provided on the angles 6f, 7f, 8f are provided on the frames 16, 17, 18; Is engaged with the frames 16, 17, 18 and the engaging portions 6j, 7j, 8j are fitted into the grooves 16a, 17a, 18a, whereby the angles 6f, 7f, 8f and the frames 16, 17, 18 are fixed to each other. It can be done well. Also, providing the grooves 16a, 17a, 18a in the frames 16, 17, 18 can be performed at a relatively low cost by simple processing or molding.

  Further, in this embodiment, since the engaging portions 6j, 7j, 8j are formed by cutting and raising, the frames 16, 17, 18 with respect to the angles 6f, 7f, 8f can be easily inserted into the U-shaped portion. It is possible to realize a structure in which 16, 17, and 18 are less likely to come off than the angles 6f, 7f, and 8f. Further, since the engaging portions 6j, 7j, and 8j are formed by cutting and raising, the frames 16, 17, and 18 are angled 6f, 7f because the cutting is partially performed without increasing the number of parts. , 8f, the engaging portion is easily elastically deformed, and the frames 16, 17, 18 can be easily fitted to the U-shaped portions of the angles 6f, 7f, 8f. Further, the frames 16, 17, 18 are pushed by the elasticity of the engaging portions 6j, 7j, 8j obtained by cutting and raising, and the prospective surface portions 6k, 7k, 8k on the surface side of the angles 6f, 7f, 8f are the frame 16, Since it press-contacts to the surface of 17 and 18, the design property improves.

  Further, in this embodiment, the indoor side end portions of the fitting portions of the angles 6f, 7f, and 8f are brought into contact with the step portions 16b, 17b, and 18b of the frame 16, 17, and 18; , 18 are regulated to the outdoor side, and the engagement between the engaging portions 6j, 7j, 8j of the U-shaped portion and the frames 16, 17, 18 can be firmly coupled to each other, and the angle 6f , 7f, 8f and the surfaces of the frames 16, 17, 18 can be configured to be flush with each other.

FIG. 4 shows another embodiment of the present invention, in which the groove 18a on the back surface of the frame 18 and the stepped portion 18b on the front surface are eliminated, and the engaging portion 8j formed by raising the angle 8f is cut into the back surface of the frame 18. This prevents the frame 18 from moving from the angle 8f to the room side. As shown in FIG. 5, this structure can also be applied to a case in which the frame 18 is a cross-wrapped base board in which a cloth 18d as a decorative sheet is attached to a base material 18c.

  Further, in this embodiment, as shown in FIG. 3, a removal groove 8m that is bent and removed at the base portion of the prospective surface portion 8i provided with the engaging portion 8j made of an aluminum alloy extruded shape with an angle 8f is formed. Since it is provided, as shown in FIG. 6, it can be used in a form in which the prospective surface portion 8i is removed.

  FIG. 7 shows another embodiment of the present invention. In this embodiment, the engaging portion 34b that engages with the prospective surface 34a and the groove 18a of the frame 18 is constituted by the vertical frame 8 and another component 34. It is. The part 34 is made of metal or synthetic resin, and the flanges 34c and 34d provided on the part 34 are fitted into the U-shaped attachment parts 8p and 8q provided on the vertical frame 8, and the attachment part 8p is provided as necessary. Clamp and fix. The angle 8f constituted by using this part 34 is fixed to a housing such as the column 5 together with the synthetic resin extruded shape 8 and the aluminum alloy extruded shape 8g by the fixture 23 shown in FIG. The same structure is adopted for the upper and lower frames.

  According to this embodiment, since it is only necessary to add the part 34 when it is necessary to provide the engaging portion 34b, as compared with the one having the removal groove 8m as shown in FIGS. The material cost and the processing cost when the part 34 is not required are reduced.

  FIG. 8 shows another embodiment of the present invention. In this embodiment, the engaging portion 8n engaged with the groove 18a of the frame 18 is formed by molding an aluminum alloy extruded shape 8g constituting the angle 8f. This is formed as a square-shaped rising portion 8n.

  In the embodiment of FIG. 8, since the rising portion 8n serving as the engaging portion is formed by molding the extruded shape member 8g, the engaging portion can be formed in the extrusion molding process. For this reason, the separate process for processing an engaging part becomes unnecessary, and simplification of the number of processes is attained.

  The rising portion 8n is not formed over the entire length of the aluminum alloy extruded profile 8g, but may be left as shown in the figure. If a part of the rising portion 8n is left, the deformation resistance in the vicinity of the rising portion 8n when the rising portion 8n is fitted into the groove 18a becomes small, and the construction becomes easy.

  In the above embodiment, the sliding window has been described as an example. However, the present invention can be applied to, for example, a fitting window, a rotating window, a turning window, an opening / closing window, a raising / lowering window, another window, a sliding door, and a rotating door. It can also be applied to doors, doors and other doors.

1: joinery frame, 2: opening, 3: window base, 4: lintel, 5: pillar, 6: bottom frame, 6f: angle, 6g: extruded shape made of aluminum alloy, 6h: extruded shape made of synthetic resin 6i: prospective surface portion, 6j: second engaging portion, 7: upper frame, 7f: angle, 7g: extruded shape made of aluminum alloy, 7h: extruded shape made of synthetic resin, 7i: prospective surface portion, 7j: first 2 engaging portions, 8: vertical frame, 8a: stepped portion, 8b: groove, 8c: base board, 8d: sheet, 8f: angle, 8g: extruded shape made of aluminum alloy, 8h: extruded shape made of synthetic resin 8i: prospective surface portion, 8j, 8n: second engaging portion, 8p, 8q: mounting portion, 10, 11, 12: spacer, 13, 14, 15: fixture, 16, 17, 18: frame, 16a 17a, 18a: groove, 16b, 17b, 18b: stepped portion, 18c: base board, 1 d: Cross, 18x: stepped portion, 20, 21: Kai wood, 22, 23, 24, 25: Kai wood, 26: interior materials, 27: interior materials, 29: tarpaulin, 30: insulation, 31: exterior Material, 32: sealing material, 33: backup material, 34: parts, 34a: prospective surface portion, 34b: engagement portion, 34c, 34d: collar portion, a, b: first engagement portion

Claims (8)

Joinery frame fixedly provided in the building opening,
An angle forming a substantially U-shaped portion that is configured to form an indoor side portion of the joinery frame and is fitted to an outdoor side of a frame provided in the building opening;
The substantially U-shaped part has a first part located on the prospective surface side of the building opening, a part separate from the first part, and a part that covers the surface of the frame. And a second part that sandwiches the frame between them,
The first part and the second part are fitted with an engaging part extending from the first part to the second part side on the outdoor side of the frame, thereby forming the substantially U-shaped part. And fixing with a fixture at the place where the first part and the second part are combined,
The outdoor side end face of the frame is made to face a surface including the engaging part among the inner faces of the substantially U-shaped part formed by the first part and the second part,
The second portion facing the second portion of the first portion is provided to protrude toward the second portion, and engages with a groove provided in the frame to restrict the movement of the frame in the indoor direction with respect to the angle. A joinery comprising two engaging portions. In the joinery of claim 1,
The first part is constituted by an aluminum alloy extruded shape, and the second part is constituted by a synthetic resin extruded shape . In the joinery according to claim 1 or 2,
A joinery characterized in that the second engaging portion is made of a protrusion having elasticity formed in a cut-and-raised shape. In the joinery according to claim 1 or 2,
The joinery characterized in that the second engaging portion is composed of a rising portion formed by extrusion molding. In the joinery according to any one of claims 1 to 4,
A step portion is formed by recessing the outdoor side of the frame surface, and the second portion is brought into contact with the recessed portion of the frame to form the surface of the second portion and the frame surface in the same plane. In addition, a joinery characterized in that an indoor side end portion of the second portion is brought into contact with the stepped portion. A frame attached to the joinery according to any one of claims 1 to 5,
The frame is provided on the second portion facing portion of the first portion so as to protrude toward the second portion, and engages with a second engagement portion that restricts the movement of the frame in the indoor direction with respect to the angle. A picture frame characterized by a possible groove. In the picture frame of Claim 6,
A frame having a step portion facing the indoor side end portion of the first portion at a portion of the frame covering the prospective surface of the first portion. Joinery frame fixedly provided in the building opening,
An angle forming a substantially U-shaped portion that is configured to form an indoor side portion of the joinery frame and is fitted to an outdoor side of a frame provided in the building opening;
The substantially U-shaped part forms a part of the joinery frame, covers a prospective surface of a frame, separates from the first part, and has a part facing the first part on the indoor side. And a second part that sandwiches a frame with the first part,
The second part includes an engaging part combined with the first part,
The second part is engaged with the first part by an engaging part formed to extend from the first part to the second part side, thereby forming the substantially U-shaped part and the second part. 1 part and the second part are combined with each other, and fixed by a fixing tool on the outdoor side of the frame,
The joinery characterized in that the outdoor side end face of the frame faces the surface including the engagement portion among the inner surfaces of the substantially U-shaped portion formed by the first portion and the second portion.

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