Surface material openers and fittings

Abstract

To install a face material opener easily without causing a situation in which an opening area of fittings is reduced.SOLUTION: A face material opener for fittings 1 comprising a frame body 10 having horizontal frames 11, 12 and vertical frames 13, 14, and a door body 20 arranged movably along the extending direction of the horizontal frames 11, 12, comprises a receiving member 31 provided on the door 20 in a state of protruding from one surface 20a of the door 20, a pressing arm 34 arranged at a position facing the receiving member 31, and a link bar 32 that extends along the vertical frames 13, 14, has an upper end connected to the pressing arm 34 and a lower end connected to the push-down pedal 33, and moves downward with respect to the vertical frame 13 when the push-down pedal 33 is operated so as to press the receiving member 31 via the pressing arm 34.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a surface material opener and a fitting. [Background technology]

[0002] Some fittings, such as sliding doors, that have a surface material arranged movably along the horizontal frame of a frame body are equipped with a surface material opener. Fittings such as sliding doors generally have a handle on the surface of the surface material that is the door leading side, and the surface material can be opened by operating the handle. A surface material opener is configured to open the surface material without touching the handle. An example of this type of surface material opener is described in Patent Document 1. In this surface material opener, a pressing member and a link mechanism are provided on the vertical frame, and when the link mechanism is operated via an operation input unit, the pressing member presses the end surface of the surface material that is the door leading side, making it possible to open the surface material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-84404 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned panel opener, in order to close the panel without creating a gap between the panel and the vertical frame, the pressing member and part of the link mechanism that operates it must be housed inside the vertical frame. Therefore, when retrofitting an existing door and window, complicated work is unavoidably required. To solve this problem, it is possible to add a new vertical frame with a built-in panel opener to the existing vertical frame. However, in the case of a door and window with a new vertical frame added, not only does the opening area decrease when the panel is opened, but the dimensions of the new vertical frame must be adjusted to match the dimensions between the upper and lower frames.

[0005] In view of the above-mentioned circumstances, the present invention has an object to provide a surface material opener and a fitting that can be easily installed without reducing the opening area of ​​the fitting. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the panel opener of the present invention is a panel opener for building materials comprising a frame body having a horizontal frame and a vertical frame, and a panel arranged so as to be movable along the extension direction of the horizontal frame, and is characterized in that it comprises a receiving member provided on the panel so as to protrude from at least one surface of the panel, a pressing member arranged in a position opposite the receiving member, and a link mechanism extending vertically along the vertical frame, having an upper end connected to the pressing member and a lower end connected to an operation input unit, and which moves downward relative to the vertical frame when the operation input unit is operated, thereby pressing the receiving member via the pressing member. Effect of the Invention

[0007] According to the present invention, a receiving member is provided on the surface of the panel, and the pressing member is configured to press the receiving member, so that it is possible to ensure airtightness between the inset surface of the panel and the inset surface of the vertical frame without having to house the pressing member inside the vertical frame. Moreover, the pressing member and link mechanism do not need to be provided without gaps between the upper frame and the lower frame. As a result, no complicated work is required even when retrofitting to an existing fixture, and it is possible to prevent a situation in which the opening area is significantly reduced when the panel is opened. [Brief description of the drawings]

[0008] [Figure 1] 1 is an external perspective view of a surface material opener according to an embodiment of the present invention; [Diagram 2] 2 is an exploded perspective view showing an operation input unit, a link mechanism, and a pressing member of the panel material opener shown in FIG. 1. [Diagram 3]3A is a perspective view of the pressing member shown in FIG. 2 in a state where it is disposed at a non-operating position, and FIG. 3B is a perspective view of the pressing member shown in FIG. 2 in a state where it is disposed at an operating position. [Figure 4] This shows a fixture to which the panel opener shown in Figure 1 is applied, where (a) is a diagram showing the appearance when the panel is placed in a closed position, and (b) is a diagram showing the appearance when the panel is placed in an open position. [Diagram 5] This shows the main parts of the fitting shown in Figure 4, where (a) is a view of the main parts when the panel is closed, and (b) is a view of the main parts when the panel is open. [Figure 6] 5A and 5B show the main parts of the fitting shown in FIG. 4, where (a) is a cross-sectional view of the panel when it is in the closed position, and (b) is a cross-sectional view of the panel when it is in the open position. [Figure 7] 5A and 5B show the vertical frame of the fitting shown in FIG. 4, in which (a) is a side view of the pressing member when placed in a non-operating position, and (b) is a side view of the pressing member when placed in an operating position. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A preferred embodiment of the surface material opener and fitting according to the present invention will be described in detail below with reference to the attached drawings. In the following, for convenience, the terms "prospect direction" and "finding direction" may be used. The "prospect direction" is the direction along the depth of the fitting, as shown by the arrow A in the figure. A surface along the prospect direction may be called a "prospect surface." The "finding direction" is a direction along the top and bottom perpendicular to the prospect direction in the case of an object that extends along the horizontal direction, such as an upper frame. In the case of an object that extends along the vertical direction, such as a vertical frame, the direction along the horizontal direction perpendicular to the prospect direction is called the "finding direction." A surface along the prospect direction may be called a "finding surface."

[0010] 1 to 3 show a surface material opener according to an embodiment of the present invention. As shown in Figs. 4 to 7, the surface material opener 1 illustrated here is applied to a fitting called a single-sided sliding door, which is provided at an opening in a wall body W that separates a passageway from a room indoors. The sliding door to which the surface material opener is applied will be described below. The single-sided sliding door is configured to include a frame body 10 and a door body (surface material) 20.

[0011] The frame body 10 is configured in a rectangular frame shape with an upper frame (horizontal frame) 11, a lower frame (horizontal frame) 12, and left and right vertical frames 13, 14, and further configured by providing uprights 15 along the top and bottom of the part on the room side between the upper frame 11 and the lower frame 12. The vertical frame located on the left side as seen from the aisle side (hereinafter referred to as the end frame 13 when distinguishing between them) is configured to have a larger dimension along the projection direction than the vertical frame located on the right side as seen from the aisle side (hereinafter referred to as the tail frame 14 when distinguishing between them) and the upright 15. The projection surface 13a of the end frame 13 faces the projection surface 14a of the tail frame 14 and the projection surface 15a of the upright 15, and is approximately parallel to the projection surface 14a of the tail frame 14 and the projection surface 15a of the upright 15. The sighting surface 13b located on the aisle side of the door end frame 13 is located on approximately the same plane as the sighting surface 14b of the tail frame 14 and the sighting surface 12b of the bottom frame 12. The sighting surface 13c located on the room side of the door end frame 13 is located on approximately the same plane as the sighting surface 15c of the upright 15 and the sighting surface 12c of the bottom frame 12. An opening that is opened and closed by the door body 20 is formed between the door end frame 13 and the upright 15. The space between the tail frame 14 and the upright 15 is closed by a sleeve wall W1. The part located on the aisle side between the upright 15 and the tail frame 14 becomes a door pocket that accommodates the door body 20 when the opening is opened. The sighting surface 13a of the door end frame 13 and the sighting surface 14a of the tail frame 14 are provided with recesses 13d, 14d in the parts facing each other. The recesses 13d, 14d are configured so that the width along the front direction is greater than the thickness of the door body 20, and are provided along the entire length of the end frame 13 and the end frame 14. The reference numeral in the figure indicates the mohair 15e provided on the front surface of the mullion 15 facing the door body 20.

[0012] The door body 20 is a flat member formed to a size that can close the opening between the door end frame 13 and the upright 15. Although not shown in the figure, the door body 20 is supported on the upper frame 11 so as to be movable, for example, via a hanging mechanism provided at the upper end, and can move along the extension direction of the upper frame 11 in the area where the recess 13d of the door end frame 13 faces the recess 14d of the door end frame 14. The plate thickness of the door body 20 is set to be smaller than the dimension along the projection direction of the door end frame 14. In the example shown in the figure, the plate thickness of the door body 20 is set to be 1 / 2 or less of the dimension along the projection direction of the door end frame 14. Furthermore, as is clear from the figure, the door body 20 is disposed in a position close to the upright 15 in the projection direction of the frame body 10. As a result, a space is secured in the portion of the frame 10 that is closer to the aisle than the door body 20, and the dimension along the projection direction is approximately half the dimension along the projection direction of the tail frame 14. The door body 20 has handles 21 attached to both sides of a portion on the door end side that is approximately in the center in the height direction.

[0013] The above-mentioned panel opener 1 is for opening the door body 20 without touching the handle 21 when entering a room from the aisle side, and as shown in Figures 1 to 3, it is equipped with a receiving member 31, a link bar (link mechanism) 32, a push pedal (operation input unit) 33 and a push arm (pushing member) 34.

[0014] The receiving member 31 is attached to the passage-side surface (one surface) 20a of the door body 20 below the handle 21, and has a receiving body 31a and a cover 31b. The receiving body 31a is a vertically long rectangular parallelepiped, and is fixed to the door body 20 on the door-front side with a receiving surface 31c facing the door-front frame 13 being almost vertical along the front direction. As is clear from the figure, the receiving surface 31c of the receiving body 31a is located closer to the tail than the front surface 20c (hereinafter simply referred to as the front surface) located on the door-front side of the door body 20. The end surface 31d of the receiving body 31a protruding toward the passage side is set so as not to protrude from the front surface 13b located on the passage side of the door-front frame 13. The cover portion 31b is a thin plate-like member that protrudes from the protruding end of the receiving body portion 31a toward the visible surface 13a of the door frame 13, and extends so as to secure a gap between it and the aisle-side surface 20a of the door body 20 and to be substantially parallel to the aisle-side surface 20a of the door body 20. The extension length of the cover portion 31b is set so that the extended edge does not come into contact with the visible surface 13a of the door frame 13 even when the door body 20 is closed.

[0015] The link bar 32 is a long, flat plate-like member, and has an arm connection part 32a at its upper end and an operation linkage part 32b at its lower end. The arm connection part 32a is rotatably connected to the upper end of a pressing arm 34 (described later) via a linkage shaft 32c extending along the front direction. The operation linkage part 32b is connected to an operation part 33a of a pressing pedal 33 (described later) via a connecting screw (not shown). The link bar 32 has a slide guide hole 32d in its middle part. The slide guide hole 32d is a slit-shaped hole extending along the length of the link bar 32 at a part that is approximately the center of the link bar 32 in the width direction. The link bar 32 is attached to the front surface 13a of the door end frame 13 in a vertical direction by screwing the mounting screw S into the door end frame 13 through the screw insertion hole 35a of the guide member 35 and the slide guide hole 32d. The position where the link bar 32 is attached is on the aisle side of the recess 13d on the front surface 13a of the door frame 13, and on the room side of the cover part 31b of the receiving member 31. That is, in this fitting, the link bar 32 is arranged to be movable vertically within the front range facing the receiving surface 31c of the receiving member 31 on the front surface 13a of the door frame 13. The guide member 35 has a cross-sectional shape that can cover the surface and both sides of the link bar 32, and forms a guide groove between the front surface 13a of the door frame 13 and the link bar 32 that can move only vertically, and is set to a longitudinal dimension shorter than that of the link bar 32. The guide member 35 has an arm support part 35b at its lower part. The arm support part 35b rotatably supports the lower end of the pressing arm 34 described later via a support shaft 35c extending along the front direction.

[0016] The push pedal 33 has an operating part 33a supported on a base 33b so as to be movable in the vertical direction. The operating part 33a is substantially rectangular parallelepiped with a flat operating surface 33c at the top. The height and area of ​​the operating surface 33c of the operating part 33a are set so that the operating surface 33c can be easily pressed down with a foot even when it is placed at the highest position. A spring (urging member) 33d that constantly urges the operating part 33a upward is built in between the base 33b and the operating part 33a. The urging force of the spring 33d is set so that the operating part 33a can be maintained upward with respect to the base 33b even when the link bar 32 is connected to the operating part 33a and the pressing arm 34 is connected to the link bar 32. This push pedal 33 is attached to the lower end of the door end frame 13 via a mounting bracket 33e by fixing a base 33b to the mounting bracket 33e attached to the front surface 13a of the door end frame 13. As is clear from the figure, the dimensions of the mounting bracket 33e, the base 33b, and the operating part 33a along the front direction are all set so that they can be placed in the space secured on the aisle side of the door body 20 in the frame body 10.

[0017] The pressing arm 34 is configured with two arm members 34b whose ends are rotatably connected to each other by a connecting shaft 34a. A pressing roller 34c is disposed at the connecting portion of the two arm members 34b. The pressing roller 34c is cylindrical with the connecting shaft 34a as the center and can rotate relatively around the axis of the connecting shaft 34a. The outer diameter of the pressing roller 34c is set so that the outer peripheral surface always protrudes outward from the non-operating position where the two arm members 34b are arranged in a straight line to the operating position where the two arm members 34b are arranged in a bent state. However, the outer diameter dimension of the pressing roller 34c is set to be smaller than the gap secured between the receiving surface 31c of the receiving member 31 and the projection surface 13a of the door end frame 13 even when the door body 20 is closed. The pressing arm 34 has an upper end connected to the arm connection part 32a of the link bar 32 via a linking shaft 32c, and a lower end connected to the arm support part 35b of the guide member 35 via a support shaft 35c. The pressing arm 34, the arm support part 35b of the guide member 35, and the link bar 32 are each sized such that when the operating part 33a of the press pedal 33 is positioned at the uppermost position due to the biasing force of the spring 33d, the pressing arm 34 is positioned in the inoperative position and the pressing roller faces the receiving surface 31c of the receiving member 31.

[0018] In the fitting having the surface material opener 1 configured as described above, when no external force is applied to the operating part 33a, as shown in Figs. 4(a), 5(a), 6(a), and 7(a), the link bar 32 is disposed upward, and the pressing arm 34 is in the inoperative position. Therefore, even when the door body 20 is moved in the closing direction, the pressing arm 34 and the receiving member 31 do not come into contact with each other, and the door body 20 can be disposed in the closed position. The closed position of the door body 20 is a state in which the door end surface 20c of the door body 20 is accommodated in the recess 13d beyond the front surface 13a of the door end frame 13, and no linear gap is formed between the door body 20 and the door end frame 13 along the front direction. When the door body 20 is disposed in the closed position, ventilation between the passage and the room is suppressed by cooperation with the mohair 15e of the mullion 15, and the passage and the room can be separated while ensuring the desired airtightness. In addition, in this closed position, the door end surface 20c of the door body 20 does not necessarily have to abut against the door end frame 13 at the recess 13d.

[0019] When the operation surface 33c of the operation unit 33a is pressed down with the foot from a state in which the door body 20 is in the closed position, the upper end of the pressing arm 34 moves downward via the link bar 32, as shown in Figs. 4(b), 5(b), 6(b), and 7(b). As a result, the pressing arm 34 is bent and placed in the operating position, and the pressing roller 34c facing the receiving member 31 moves in a direction away from the door end frame 13, so that the door body 20 is pressed in the opening direction via the receiving surface 31c of the receiving member 31. In other words, with this fixture, it is possible to move the door body 20 placed in the closed position to the open position without touching the handle 21 provided on the door body 20. Therefore, for example, if the pressing roller 34c is set to protrude about 100 mm from the projection surface 13a of the door end frame 13 when the link bar 32 is placed in the lowest position, it is possible to open the door body 20 to the fully open position by inserting one's body into the gap generated between the door end frame 13 and the door body 20. As a result, even if the door fittings are installed in a room where many people enter and exit, there is no risk of a hygiene problem. In addition, the door body 20 can be opened even when both hands are occupied with luggage, etc., which is extremely advantageous in terms of usability. When the foot is removed from the operating part 33a, regardless of the open / closed state of the door body 20, the operating part 33a moves upward by the biasing force of the spring 33d, and the link bar 32 moves upward accordingly, so that the pressing arm 34 returns to the inoperative state. Therefore, the pressing arm 34 protruding when the door body 20 is opened does not get in the way of entering and exiting, and the opening area of ​​the door body 20 is not significantly reduced when the door body 20 is opened.

[0020] In addition, all of the components of the above-mentioned surface material opener 1 remain exposed to the outside of the frame body 10. Therefore, even when retrofitting to an existing fixture, no complicated work is required, and maintenance work can be easily performed. On the other hand, since all of the components including the push pedal 33 are housed within the visible surface of the frame body 10, they do not interfere with pedestrians passing through the passage along the passage-side surface 20a of the door body 20. Furthermore, the closed position of the door body 20 relative to the frame body 10 does not change before and after the surface material opener 1 is attached, and it is possible to maintain the airtightness originally secured between the passage and the room even after the surface material opener 1 is attached.

[0021] Furthermore, when the link bar 32 moves upward and the pressing arm 34 presses the receiving member 31, the rigidity of the link bar 32 must be considered so that it does not buckle, and the plate thickness of the link bar 32 must be large. In contrast, in the above-mentioned surface material opener 1, the pressing pedal 33 is provided at the lower end of the link bar 32, and when the link bar 32 moves downward, the receiving member 31 is pressed via the pressing arm 34. In other words, when the receiving member 31 is pressed, a tensile force acts on the link bar 32. Therefore, there is no need to consider buckling for the link bar 32, and not only can it be made thinner, but also a flexible cord-like body such as a wire can be used, making it possible to ensure a larger opening area when the surface material is opened. When a wire is used as the link mechanism, the spring 33d of the pressing pedal 33 can be omitted and a biasing means can be built into the link mechanism.

[0022] In the above-mentioned embodiment, the door is provided on a wall that separates a passageway from a room indoors, but the present invention is not limited thereto. For example, the door may be provided on a wall that separates rooms indoors, or may be provided on a wall that separates the indoor area from the outdoors. In this case, the surface material does not necessarily have to be a door body, and may be provided with a frame around the four sides of a glass plate. In addition, the door is not limited to a door body that has only one surface material, and may be a door body that has multiple surface materials, such as a sliding window. Furthermore, the surface material does not necessarily have to be supported on the upper frame via a hanging mechanism, and may be supported so as to be openable and closable via a wheel provided at the lower end.

[0023] In addition, in the above-described embodiment, a recess is formed on the visible surface of the door edge frame, and when the door body is placed in the closed position, the door edge portion of the door body is accommodated in the recess; however, it is not necessarily necessary to provide a recess in the door edge frame, and the door edge surface may be configured to abut against the visible surface of the door edge frame when the door body is placed in the closed position.

[0024] Furthermore, in the above-mentioned embodiment, the receiving member is arranged only on one surface of the face material, but the receiving member may also be arranged on the other surface, and a pressing member and a link mechanism may be provided to press the receiving member on the other surface. The receiving member does not need to be configured as a member separate from the handle, and the handle can also be used as the receiving member. In addition, the protruding end face of the receiving member is positioned on approximately the same plane as the visible surface located on the aisle side of the vertical frame, but the present invention is not limited to this. Furthermore, the pressing member is exemplified as being configured to press the receiving member when the two arm members are bent, but the present invention is not limited to this. In addition, the pressing member is not necessarily limited to being equipped with a pressing roller.

[0025] Furthermore, in the above-described embodiment, the push pedal is attached to the visible surface of the vertical frame via a mounting bracket, making it possible to apply it to building materials without being limited by the material of the flooring, but it is not necessarily necessary to attach the push pedal to the vertical frame.

[0026] As described above, the panel opener of the present invention is a panel opener for building materials comprising a frame body having horizontal and vertical frames, and a panel arranged so as to be movable along the extension direction of the horizontal frame, and is characterized in that it comprises a receiving member provided on the panel so as to protrude from at least one surface of the panel, a pressing member arranged in a position opposite the receiving member, and a link mechanism extending vertically along the vertical frame, having an upper end connected to the pressing member and a lower end connected to an operation input unit, and which moves downward relative to the vertical frame when the operation input unit is operated, thereby pressing the receiving member via the pressing member. According to this invention, since the receiving member is provided on the surface of the panel and the pressing member is configured to press the receiving member, it is possible to ensure airtightness between the projected surface of the panel and the projected surface of the vertical frame without having to accommodate the pressing member inside the vertical frame. Moreover, the pressing member and the link mechanism do not need to be provided without a gap between the upper frame and the lower frame. As a result, even when retrofitting to an existing door and window, complicated work is not required, and it is possible to prevent a situation in which the opening area is significantly reduced when the panel is opened. Moreover, an operation input unit is provided at the lower end of the link mechanism, and the receiving member is pressed via the pressing member when the link mechanism moves downward. In other words, a tensile force is applied to the link mechanism when the receiving member is pressed. As a result, it is not necessary to consider buckling for the link mechanism, and not only can it be made thinner, but also a flexible cord-like body such as a wire can be applied, making it possible to ensure a larger opening area when the panel is opened.

[0027] Furthermore, the present invention is characterized in that, in the above-mentioned surface material opener, the operation input unit is arranged to be movable in the vertical direction relative to the base, and is equipped with an operation unit having an operation surface on its upper surface, and when an operating force is applied to the operation surface, it moves downward relative to the base, thereby moving the link mechanism downward. According to this invention, the operating unit can have an operating surface large enough to be stepped on, and can be housed within the visible surface area of ​​the frame, thereby enabling space saving.

[0028] The present invention is also characterized in that, in the above-mentioned surface material opener, the operation input unit has a biasing member between the base and the operation unit which constantly biases the operation unit upward relative to the base. According to this invention, there is no need to provide a biasing member in the link mechanism, and the link mechanism can be made even thinner.

[0029] The present invention is also characterized in that, in the above-mentioned surface material opener, the operation input unit is provided with a mounting bracket that is attached to the visible surface of the vertical frame, and the base is attached to the mounting bracket. According to this invention, since there is no need to attach the operation input unit to the floor surface, it can be applied to building materials without being limited by the material of the flooring.

[0030] The fitting according to the present invention is characterized in that it is provided with the above-mentioned panel opener. According to this invention, since the receiving member is provided on the surface of the panel and the pressing member is configured to press the receiving member, it is possible to ensure airtightness between the projected surface of the panel and the projected surface of the vertical frame without having to accommodate the pressing member inside the vertical frame. Moreover, the pressing member and the link mechanism do not need to be provided without a gap between the upper frame and the lower frame. As a result, even when retrofitting to an existing door and window, complicated work is not required, and it is possible to prevent a situation in which the opening area is significantly reduced when the panel is opened. Moreover, an operation input unit is provided at the lower end of the link mechanism, and the receiving member is pressed via the pressing member when the link mechanism moves downward. In other words, a tensile force is applied to the link mechanism when the receiving member is pressed. As a result, it is not necessary to consider buckling for the link mechanism, and not only can it be made thinner, but also a flexible cord-like body such as a wire can be applied, making it possible to ensure a larger opening area when the panel is opened.

[0031] The present invention is also characterized in that, in the above-mentioned building fixture, the pressing member and the link mechanism are provided on the visible surface of the vertical frame. According to this invention, it is possible to reduce the dimensions along the projected direction of the fixture to which the panel opener is applied. [Explanation of symbols]

[0032] 1 surface material opener, 10 frame body, 11 upper frame, 12 lower frame, 13 door end frame, 13a door end frame projection surface, 20 door body, 20a aisle side surface, 31 receiving member, 32 link bar, 33 push pedal, 33a operation part, 33b base, 33c operation surface, 33d spring, 33e mounting bracket, 34 push arm

Claims

1. A surface material opener for fittings, comprising a frame body having a horizontal frame and a vertical frame, and a surface material arranged to be movable along the extension direction of the horizontal frame, A receiving member provided on the face material in a state where the receiving member protrudes from at least one surface of the face material; A pressing member disposed at a position facing the receiving member; a link mechanism that extends vertically along the vertical frame, has an upper end connected to the pressing member and a lower end connected to an operation input unit, and when the operation input unit is operated, moves downward with respect to the vertical frame to press the receiving member via the pressing member; A surface material opener comprising:

2. The surface material opener described in claim 1, characterized in that the operation input unit is arranged to be movable in the vertical direction relative to the base and is equipped with an operation unit having an operation surface on its upper surface, and when an operating force is applied to the operation surface, it moves downward relative to the base, thereby moving the link mechanism downward.

3. 3. The surface material opener according to claim 2, wherein the operation input unit is provided with a biasing member between the base and the operating unit, the biasing member constantly biasing the operating unit upward relative to the base.

4. The operation input unit includes a mounting bracket attached to a projecting surface of the vertical frame, 3. The panel opener of claim 2, wherein the base is attached to the mounting bracket.

5. A fitting comprising a panel opener according to any one of claims 1 to 3.

6. The fixture according to claim 5, characterized in that the pressing member and the link mechanism are provided on the visible surface of the vertical frame.

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