KR100862938B1 - Collapsible led electric light board - Google Patents

Abstract

A folded LED(Light Emitting Diode) board is provided to maximize an advertisement effect by expanding another board by a connection unit and forming a frame of various folded shapes. A folded LED board includes a first frame(110), a second frame(120), and a hinge(150). An LED board emitted by a control unit is installed on the first frame. The second frame is flexibly coupled to the first frame. An LED board emitted by the control unit is installed on the second frame. The hinge unit folds the first and second frames. The first and second frames are folded and form an installation plate. A distortion prevention piece for preventing distortion is installed on an upper/lower part of the installation plate and the first and second frames. A sub frame(130) is installed on a front plane of the first and second frames. A sub control unit(135) coupled to a data cable divided from the control unit is installed on a rear plane of the sub frame.

Description

Foldable Multi-LED Display Board {Collapsible LED electric light board}

The present invention relates to a foldable multi-LED display board, and more particularly, the angle of the first frame and the second frame by the hinge means is easy to change the angle, by the connecting means can expand another display board large The present invention relates to a foldable multi-LED display board capable of forming a screen and a frame having various shapes that are refracted.

In general, companies use a variety of advertising means in order to inform consumers that they are superior and excellent for their business name and product through advertisement, especially the light emitting means in which the LED (LED) installed inside the fixed frame is fixedly arranged. LED signboards are formed in a way that reveals the text of the advertisement by using a combination of a plurality of pixel panels horizontally and vertically in the horizontal direction, respectively, forming a single stage, and transmits the display board while transmitting the advertising content. The protective floodlight plate is attached to the front side, and the rear panel protecting the rear side of the billboard is attached to the rear side, and the outside of the billboard to which the floodlight plate and the back plate are attached is fixed to the frame.

Therefore, it is suitable to catch the eyes of many people at the same time without distinguishing between indoor and outdoor, the use trend is increasing significantly.

Meanwhile, the frame fixing the outside of the LED signboard is a means for protecting the pixel panel, the floodlight panel and the back panel of the signboard and installing and supporting the display board indoors or outdoors. The importance is also growing, and technology development is in progress.

1 is a perspective view showing a conventional LED sign, Figure 2 is a side cross-sectional view showing a conventional LED sign.

As shown, the conventional LED display board 1 is composed of a rectangular frame 10 and the LED board 20 is coupled to the frame 10 by a bolt.

The control unit 30 is provided inside the frame 10 and transmits data to the LED board 20 by a cable.

That is, the controller 30 receives and converts data transmitted from a computer or an image output apparatus linked to the computer, and transmits the converted data to the LED board 20 to display the information. Done.

In addition, a light transmitting plate 12 is installed on the front surface of the frame 10 to express information displayed on the LED board 20, and a rear plate 14 is installed on the rear surface of the frame 10. Should not be visible.

In the conventional Eldie Display Board, the frame had to be made large in order to maximize the advertising effect, and the Display Board made of large size was able to promptly set up the surrounding environment during various event events such as broadcasting stations requiring fast installation and dismantling of the display board due to its weight. There is a risk of breakage because of its unique and distinctive form of signboard, which is suitable for the atmosphere and decoration. It is not permeable to the back of the signboard and is affected by strong winds.

In addition, in the case of loading and using a plurality of display boards in order to form a large display board, there is a problem that any one display board is inconvenient to replace when it is defective, and uses a frame having a rectangular thick width, and does not have a folded structure, and thus the angle of expansion It is difficult to change, and when the angle of the frame is changed, the gap is widened, which adversely affects the advertising effect.

Therefore, there is a need for improvement.

The present invention has been made to solve the above problems, the angle is easy to change by the structure in which the first frame and the second frame is folded by the hinge means, it is possible to extend another display plate by the connecting means An object of the present invention is to provide a foldable multi-LED display board that maximizes an advertisement effect because a large screen and a refracted frame can be formed.

In order to achieve the above object, a first embodiment of the present invention provides a first frame in which an LED board which emits light by a controller is installed, and a second board which is connected to the first frame and in which the LED board emits light by the controller is installed. And a hinge means for folding the frame and the first and second frames.

The first and second frames are bent to form an installation plate, and the first and second frames and the upper and lower ends of the installation plate are provided with a torsion preventing piece to prevent torsion.

An auxiliary frame is provided at the front of the first and second frames, and an auxiliary control unit is provided at the rear of the auxiliary frame to connect the data cable branched from the controller.

Preferably, the hinge means is formed in each of the opposing portions of the first and second frames, the connecting piece formed with a hinge hole, and a hinge axis inserted into the hinge hole of the connecting piece.

On the other hand, the second embodiment of the present invention is a first frame is installed, the LED board to be emitted by the controller, a second frame is connected to the first frame and the LED board is emitted by the controller, and the first frame It is provided between the two frames, the support frame for fixing the control unit, and provided on the support frame is characterized in that it comprises a hinge means for folding the first and second frames on the basis of the support frame.

The hinge means includes a connecting portion attached to the front surface of the support frame, a connecting piece formed at an opposing portion of the first and second frames so as to be connected to the connecting portion, and a hinge shaft for hinge coupling the connecting piece to the connecting portion.

The support frame is provided with a mounting portion to have the control unit.

The first and second frames of the first and second embodiments are guided by the guide member when folded by the hinge means.

The guide member extends into the side surfaces of the first and second frames, and includes a guide piece having guide holes formed therein and guide bars coupled to guide guides of the guide pieces, respectively.

Preferably the guide piece is made up of a pair of spaced apart up and down, the end of the guide bar is interposed between the guide piece.

The guide shaft is characterized in that it further comprises a position fixing member to fix the position in the guide hole.

The position fixing member includes a screw thread formed on an outer circumferential surface of the guide shaft, and a tightening lever coupled to the screw thread to tighten the screw.

In addition, it is preferable that the uneven protrusions are formed on the inner surface of the guide hole.

In addition, each of the first and second frames is characterized in that it is provided with a connecting means for coupling another electronic plate up, down, left and right.

The connecting means is coupled to the side of the first and second frames and the upper and lower portions of the support frame, respectively, a pair of connecting bodies that form a space therein, and is coupled to any one of the connecting bodies and rotated by an operating member And a hook member protruding from the connecting body, and a locking shaft provided inside the other one of the connecting bodies and caught by the ring member.

In addition, the connecting body of the connecting means is further provided with an alignment member for intermittently aligning the connection of the hook member and the locking shaft when the other electronic plate is coupled to the first and second frames.

The alignment member includes a shaft inserted into the receiving groove formed in any one of the connecting body and fixedly connected to the locking shaft, and an elastic member elastically supported on the inner surface of the receiving groove to interlock the shaft with the locking shaft; Is formed in the other of the connecting body is made of a seating groove in which the shaft is seated.

One end of the shaft is screwed with the engaging shaft, the other end is characterized in that hemispherical shape.

Preferably a gripping groove is formed around the shaft.

As described above, according to the foldable multi-LED display panel according to the present invention, the angle of the first frame and the second frame are folded by the hinge means, and thus the angle can be easily changed. Since the screen and the various shapes of the refraction can be formed, it has the effect of maximizing the advertising effect.

In addition, the center portion of the guide bar is coupled to the back of the support frame, both ends are coupled to the fixing piece of the outer edge of the first and second frame has the advantage of reinforcing the overall rigidity.

In addition, there is an advantage that the angle change of each frame is made stable around the hinge means by the guide member, and the user can finely adjust the angle change of each frame by the uneven projection formed inside the guide hole.

In addition, it can be accurately aligned by the alignment member when expanding to a large display board has the advantage that the user can easily align each display board.

Hereinafter, with reference to the accompanying drawings will be described a folding multi-LED display board according to a preferred embodiment of the present invention.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

Therefore, definitions of these terms should be made based on the contents throughout the specification.

On the other hand, for convenience of description, the same parts or structures as the conventional invention and the same parts use the same reference numerals or names.

Figure 3 is an exploded perspective view of a foldable multi-LED display board according to a preferred embodiment of the present invention, Figure 4 is a perspective view of a combined multi-LED display board according to a preferred embodiment of the present invention, Figure 5 is a preferred embodiment of the present invention The rear perspective view of the foldable multi-LED display board according to Figure 6 is a plan view of the foldable multi-LED display board according to a preferred embodiment of the present invention, Figure 7 is a folding operation state diagram of the foldable multi-LED display board according to a preferred embodiment of the present invention. 8 or 9 is an operating state diagram expanded by the connecting means of the foldable multi-LED display board according to a preferred embodiment of the present invention, Figure 10 or 11 is a connection of the foldable multi-LED display board according to a preferred embodiment of the present invention It is a figure which shows the expanded state by means.

As shown, the foldable multi-LED display panel 100 according to a preferred embodiment of the present invention is the first frame 110 is installed, the LED board 105 is emitted by the control unit 145, and the first frame ( The second frame 120 connected to the 110 and the LED board 105 which is emitted by the control unit 145 is installed between the first and second frames 110 and 120, and the control unit 145 is provided. It includes a support frame for fixing 140 and the hinge means 150 provided in the support frame 140 to fold the first and second frames 110 and 120 based on the support frame 140.

The outer edges of the first and second frames 110 and 120 are bent to form mounting plates 112 and 122, and the first and second frames 110 and 120 and the upper and lower ends of the mounting plates 112 and 122 to prevent torsion. 125 is provided.

In addition, an auxiliary frame 130 is provided on the front of the first and second frames 110 and 120, and a data cable (not shown) branched from the control unit 145 is connected to the rear of the auxiliary frame 130. Auxiliary control unit 135 is provided.

The first and second frames 110 and 120, the torsion preventing piece 125, and the auxiliary frame 130 are made of aluminum and have only edges to minimize weight.

In addition, the torsion preventing piece 125 has a right triangle shape facing the first and second frames 110 and 120 to be folded by the hinge means 150.

Pedestals 127 are provided at each corner formed by the installation plates 112 and 122 and the torsion preventing pieces 125.

The first frame 110 and the second frame 120 are provided to be symmetrical, and the support frame 140 is provided between the first and second frames 110 and 120, and is formed vertically from the ground. .

A binding unit 132 is formed on the front surface of the auxiliary frame 130 so that a plurality of LED boards 105 are coupled, and an auxiliary control unit applying a signal to the LED board 105 on the rear surface of the binding unit 132. A 135 is provided so that the LED board 105 is coupled to the auxiliary control unit 135 provided at the rear side of the binding unit 132 by a connector connection method.

The LED board 105 has a structure in which a plurality of LEDs are formed in a bar shape disposed in front and spaced apart from each other so that the front and rear sides of the LED display board are vented.

The hinge means 150 has a connecting portion 154 attached to the front surface of the support frame 140 and a connecting piece 154 formed at a portion of the first and second frames 110 and 120 facing each other to be connected to the connecting portion 152. And, the hinge shaft 156 for hinge coupling the connecting piece 154 to the connecting portion 152.

The hinge shaft 156 may be formed integrally with the connecting portion 152, and the connecting portion 152 and the connecting piece 154 are preferably fixed to each other by a bolt to the frame.

In addition, the support frame 140 is characterized in that the mounting portion 142 is formed to include the control unit 145.

The mounting portion 142 is formed in the longitudinal direction of the support frame 140 so that the control unit 145 is provided vertically from the ground so that the first and second frames 110 and 120 are folded by the hinge means 150. It is desirable to secure the angle of folding when it loses.

The first and second frames 110 and 120 are guided by the guide member 160 when folded by the hinge means 150.

The guide member 160 extends into side surfaces of the first and second frames 110 and 120, and includes a guide piece 161 having a guide hole 162 therein, and a guide hole of the guide piece 161. Each of the guide bars 165 coupled to the guide shaft 167 to the 162.

The guide piece 161 is composed of a pair of spaced apart up and down, the end of the guide bar 165 is interposed between the guide piece 161.

In addition, the guide holes 162 may be formed in two lines on the guide piece 161, and two guide shafts 167 may be formed to be coupled to the guide holes 162, respectively.

In addition, the guide bar 165 is preferably fixed to the support frame 140.

A coupling groove 169 corresponding to the width of the support frame 140 is formed in the center portion of the guide bar 165 to be fixed to the support frame 140.

The guide shaft 167 is further provided with a position fixing member 170 to fix the position in the guide hole 162.

The position fixing member 170 includes a screw thread 172 formed on an outer circumferential surface of the guide shaft 167 and a tightening lever 174 coupled to the screw thread 172 and screwed thereto.

It is preferable that an uneven protrusion 164 is formed on an inner side surface of the guide hole 162, and the guide shaft 167 can slide in multiple stages in the guide hole 162 by the uneven protrusion 164. Fine angle change is possible.

In addition, each of the first and second frames 110 and 120 is provided with a connecting means 180 to couple another electric plate 100 'up, down, left and right.

The connecting means 180 is coupled to the upper and lower sides of the first and second frames 110 and 120 and the support frame 140, respectively, a pair of connecting body 182 having a space therein and the connecting body ( The ring member 184 is coupled to any one of the 182 is rotated by the operation member 185 and emerged from the connection body 182, and provided inside the other of the connection body 182, the ring member It consists of a locking shaft 186 to be caught by (184).

The connecting means 180 is a ring member 184 and the locking shaft 186 provided on the side of the first and second frames 110 and 120, the ring member 184 and the locking shaft provided on the upper and lower portions of the support frame 140 It consists of 186 and has the same structure except that only the installation position is different.

In addition, the operation member 185 is capable of rotating the ring member 184, and can be various forms such as a handle that can be exposed to rotate outside.

As shown in the figure, the operation member 185 is a polygonal groove formed in the ring member 184, and inserts a polygonal wrench into the polygonal groove to rotate the loop member 184.

In addition, as shown in FIG. 8, the coupling body 182 of the connecting means 180 engages the hook member 184 with the hook member 184 when the other electronic plate 100 ′ is coupled to the first and second frames 110 and 120. Alignment member 190 is further provided to intermittently align the connection of the (186).

The alignment member 190 is inserted into the receiving groove 191 formed in any one of the connecting body 182, the shaft 192 is fixedly connected to the locking shaft 186, and the receiving groove 191 An elastic member 194 elastically supported at an inner side to interlock the shaft 192 with the locking shaft 186, and a seating groove formed at the other one of the connection bodies 182 to seat the shaft 192; 196).

In this case, the locking shaft 186 is inserted into the long hole (195) in the connection body 182 to be interlocked with the shaft 192 is coupled to be movable.

One end of the shaft 192 is screwed so as to be detachable from the locking shaft 186, and the other end is hemispherical.

Therefore, the mounting groove 196 in which the shaft 192 is seated is also recessed in a hemispherical shape.

In addition, a grip groove 193 may be formed around the shaft 192.

Hereinafter, the operation and effects of the foldable multi-LED display board according to the preferred embodiment of the present invention.

First, the hinge shaft 156 is provided with a support frame 140 in the center and a connecting portion 152 formed on the front surface of the support frame 140 and a connecting piece 154 of the first and second frames 110 and 120. Hinged by.

Installation plates 112 and 122 are formed on side surfaces of the first and second frames 110 and 120, and torsion preventing pieces 125 are formed on upper and lower surfaces to reinforce rigidity of the first and second frames 110 and 120.

In addition, the base plate 127 is provided at the corner formed by the installation plates 112 and 122 and the torsion preventing piece 125 to facilitate mounting on the ground, and to easily mount another display plate 100 ′.

Subsequently, after the coupling groove 169 of the guide bar 165 is fixed to the rear surface of the support frame 140, both ends of the guide piece 161 formed on the side inner side surfaces of the first and second frames 110 and 120. The guide shaft 167 is inserted into the guide hole 162 to sandwich the both ends of the guide bar 165 to the guide piece 161.

The control frame 145 is provided on the support frame 140, and the control unit 145 stacked on the protection case is mounted on the mounting unit 142 to protect the internal circuit board.

The data cable (not shown) branched from the control unit 145 is connected to the auxiliary control unit 135 provided in the binding unit 132 of the first and second frames 110 and 120.

Then, the LED board 105 on the front of the first and second frames 110 and 120 is coupled to the auxiliary control unit 135 provided on the rear of the binding unit 132 by a connector connection method.

Subsequently, the connection body 182 having the ring member 184 and the locking body 186 to correspond to the side portions of the first and second frames 110 and 120 and the upper and lower portions of the support frame 140, respectively. 182 is combined to complete the assembly.

A central portion of the guide bar 165 is coupled to the rear surface of the support frame 140, and both ends thereof are connected to the sides of the first and second frames 110 and 120 to distribute the load to reinforce rigidity.

When the guide shaft 167 is tightened with the tightening lever 174 positioned at the inner end of the guide hole 162, the first and second frames 110 and 120 maintain a planar state.

On the other hand, as shown in Figure 7 when the user wants to use the LED display panel 100 by bending the first and second frames (110, 120) according to the surrounding environment and atmosphere, loosen the tightening lever 174 guide shaft ( Release the fixed state of the 167 and the first and second frames (110, 120) are bent at a desired angle around the hinge means 150, and then the tightening lever 174 on the thread 172 of the guide shaft (167) Tighten again to fix.

At this time, the center of the guide bar 165 is attached to the back of the support frame 140 can stably change the angle of the first and second frames (110, 120), the uneven protrusions of the guide hole 162 ( 164) it is possible to change the angle in multiple stages, there is an advantage that the user can set the desired angle.

In addition, as illustrated in FIG. 9 or FIG. 10, when the user wants to extend the LED display panel 100 up, down, left, or right, the user may contact the other display panel 100 ′ with the sides and top and bottom of the first and second frames 110 and 120. Then, when the hook member 184 is rotated by the operation member 185 to hang on the locking shaft 186, a large LED display board may be provided.

At this time, the first and second frames 110 and 120 and the other electric sign 100 'are not aligned correctly, and the shaft 192 exposed to the front of the connection body 182 is inserted into the receiving groove 191. Then, the locking shaft 186 screwed to the shaft 192 is also pushed back, so that the ring member 184 is not caught by the locking shaft 186 and cannot be coupled.

Therefore, when the end of the shaft 192 coincides with the seating groove 196, the shaft 192 and the locking shaft 186 is moved to the front side by the elastic member 194, the shaft 192 is seating groove 196 As it is mounted on the first and second frames 110 and 120, the electronic display panel 100 ′ is accurately aligned to allow expansion.

In addition, since the shaft 192 is detachably screwed to the locking shaft 186, only the corresponding parts can be replaced when the shaft 192 and the locking shaft 186 are damaged, and around the shaft 192 The gripping groove 193 is formed there is an easy advantage in the replacement operation.

Meanwhile, as shown in FIG. 11, when the LED display panel 100 is provided with a plurality of LEDs to bend like a circle, the first and second frames 110 and 120 are connected to the supporting frame 152 of the supporting frame 140. By connecting another LED panel 100 'by the connecting means 180 in a folded state, the LED display panel can be installed at various angles, and thus the curved surface or the folded image can be realized as a smoothly connected image. It becomes possible.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1 is a perspective view showing a conventional LED display.

Figure 2 is a side cross-sectional view showing a conventional LED display.

Figure 3 is an exploded perspective view of a foldable multi-LED display board according to a preferred embodiment of the present invention.

Figure 4 is a perspective view of the folding multi-LED display board according to a preferred embodiment of the present invention.

Figure 5 is a rear perspective view of a foldable multi-LED display board according to a preferred embodiment of the present invention.

6 is a plan view of a foldable multi-LED display board according to a preferred embodiment of the present invention.

7 is a folding operation state of the foldable multi-LED display board according to a preferred embodiment of the present invention.

8 or 9 is an operating state diagram expanded by the connecting means of the folding multi-LED display board according to a preferred embodiment of the present invention.

10 or 11 is a view showing an extended state by the connecting means of the foldable multi-LED display board according to a preferred embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: folding multi LED display board 110: the first frame

112, 122: mounting plate 120: second frame

125: torsion prevention piece 130: auxiliary frame

132: binding unit 135: auxiliary control unit

140: support frame 142: mounting portion

145 control unit 150 hinge means

152: connecting portion 154: connecting piece

156: hinge shaft 160: guide member

161 Guide: 162 Guide Hall

164: bumps 165: guide bar

167: guide shaft 170: position fixing member

172: thread 174: tightening lever

180: connecting means 182: connecting body

184: ring member 186: locking shaft

190: alignment member 192: shaft

193: gripping groove 194: elastic member

196: settling groove

Claims (21)

A first frame on which the LED board which is emitted by the controller is installed; A second frame connected to the first frame and provided with an LED board emitting light by the controller; A hinge means for folding the first and second frames; The first and second frames are bent to form a mounting plate; Folding first and second LED display board, characterized in that the torsion prevention piece is provided in the upper and lower ends of the first and second frames and the installation plate to prevent the torsion. delete The method of claim 1, An auxiliary frame is provided at the front of the first and second frames, respectively; The rear of the auxiliary frame foldable multi-LED display board, characterized in that the auxiliary control unit for connecting the data cable branched from the control unit is provided. The method of claim 1, The hinge means is formed in each of the facing portions of the first and second frames, the connecting piece formed a hinge hole; Folding LED display panel, characterized in that consisting of a hinge shaft inserted into the hinge hole of the connecting piece. A first frame on which the LED board which is emitted by the controller is installed; A second frame connected to the first frame and provided with an LED board emitting light by the controller; A support frame provided between the first and second frames to fix the control unit; A folding multi-LED display board, comprising a hinge means provided in the support frame to fold the first and second frames on the basis of the support frame. The method of claim 5, The first and second frames are bent to form a mounting plate; Folding first and second LED display board, characterized in that the torsion prevention piece is provided in the upper and lower ends of the first and second frames and the installation plate to prevent the torsion. The method of claim 5, The hinge means includes a connecting portion attached to the front of the support frame; A connecting piece formed at an opposing portion of the first and second frames to be in contact with the connecting part; Folding LED display panel, characterized in that consisting of a hinge shaft for hinge coupling of the connecting piece to the connecting portion. The method of claim 5, An auxiliary frame is provided at the front of the first and second frames, respectively; The rear of the auxiliary frame foldable multi-LED display board, characterized in that the auxiliary control unit for connecting the data cable branched from the control unit is provided. The method of claim 5, The support frame is foldable multi-LED display board, characterized in that the mounting portion is formed to have the control unit. The method according to claim 1 or 5, And the first and second frames are guided by guide members when folded by the hinge means. The method of claim 10, The guide member may include a guide piece extending into side surfaces of the first and second frames and having guide holes formed therein; Folding LED display board, characterized in that consisting of a guide bar coupled to each of the guide hole of the guide piece by a guide shaft. The method of claim 11, The guide piece is made up of a pair of spaced apart up and down, the end of the guide bar is foldable multi-LED signboard, characterized in that interposed between the guide piece. The method of claim 11, The guide shaft is a foldable multi-LED display board further comprises a position fixing member to fix the position in the guide hole. The method of claim 13, The position fixing member is a thread formed on the outer peripheral surface of the guide shaft; Foldable multi-LED display board, characterized in that consisting of a fastening lever coupled to the screw thread. The method of claim 11, Foldable multi-LED display board, characterized in that the irregularities formed on the inner surface of the guide hole. The method according to claim 1 or 5, Each of the first and second frames is provided with connecting means for coupling another frame up, down, left and right. The method of claim 16, The connecting means is coupled to the sides of the first and second frames and the upper and lower portions of the support frame, respectively, a pair of connecting bodies having a space therein; A ring member coupled to any one of the connection bodies and rotated by an operation member to emerge from the connection body; Foldable multi-LED display board, characterized in that the engaging shaft which is provided in the other of the connecting body to be caught by the ring member. The method of claim 17, The connecting body of the connecting means is foldable multi-LED display board further comprises an alignment member for intermittently aligning the connection between the hook member and the locking shaft when the first frame and the second frame is coupled. The method of claim 18, The alignment member and the shaft is inserted into the receiving groove formed in any one of the connecting body and the shaft fixedly connected to the locking shaft; An elastic member elastically supported on an inner surface of the receiving groove to interlock the shaft with the locking shaft; Foldable multi-LED signboard, characterized in that formed in the other of the connecting body made of a seating groove in which the shaft is seated. The method of claim 19, One end of the shaft is screwed to the engaging shaft, the other end is a folding multi-LED display board, characterized in that hemispherical shape. The method of claim 19, Foldable multi-LED display board, characterized in that the grip groove is formed around the shaft.

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