JP2017193312A - Head-up display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a "head-up display device" capable of starting up a combiner immediately and preventing interference with other equipment by increasing the degree of freedom of design of a rear lower part.SOLUTION: An HUD device 1 according to the present invention is configured to: open a first opening part 2 provided on a movement path of a combiner 5 with a first cover 7 moving forward, open a second opening part 3 provided on an optical path of light irradiating the combiner 5 from a projection part (second mirror 19) of a light emission unit 6 with a second cover 8 moving forward as well; and lower the combiner 5 from a top position above an in-use position to the in-use position after storing the second cover 8 in a casing 11 through below the combiner 5 with the combiner 5 moved to the top position.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a head-up display device that displays vehicle information, navigation information, and the like to a driver using a combiner.

  Conventionally, the combiner and the light emitting unit are housed inside the dashboard, and the combiner is projected from the top surface of the dashboard when in use. There is also known a head-up display device (hereinafter referred to as a HUD device) that displays a virtual image on a combiner disposed on the driver side.

  As an example of such a HUD device, as disclosed in Patent Document 1, an opening that allows a combiner to be taken in and out is provided on the upper surface of a casing that houses a combiner and a light emitting unit. Is closed by two covers, and in use, the two covers are rotated in the opposite direction forward (windshield side) and backward (driver side) and housed in the casing. A structure is proposed in which a combiner is projected upward from the opening that opens and the display light of the light emitting unit is irradiated to the combiner through the opening in this state.

  As another example of the HUD device, as disclosed in Patent Document 2, the opening provided on the upper surface of the casing can be opened and closed by two covers, and the two covers are used at the time of use. After rotating forward so as to increase the overlapping width and storing in the casing, the combiner protrudes upward from the opening opened by the rotation of both covers, and in this state the display of the light emitting unit A configuration in which light is irradiated to a combiner through an opening has been proposed.

JP 2012-254707 A JP 2014-201104 A

  In the former HUD device disclosed in Patent Document 1, the openings are opened by rotating the two covers in the reverse direction forward and backward, so the two covers are attached to the casing. It is possible to simultaneously perform the operation of opening the opening by storing in the interior and the operation of protruding the combiner from the inside of the casing to the upper portion of the opening, and the combiner is protruded from the inside of the casing in a short time during use. It becomes possible. However, since it is necessary to rotate one cover to the rear (driver side) and store it in the internal space of the casing when the opening is opened, the design freedom of the rear lower part in the casing is greatly limited. There was a problem that it interfered with the installation space of instruments such as a speedometer installed in front of the driver's seat.

  On the other hand, in the former HUD device disclosed in Patent Document 2, the opening is opened by letting one cover under the other while rotating the two covers forward. For this reason, the entire apparatus is not enlarged in the front-rear direction. However, after the two covers that rotate forward completely pass through the moving path of the combiner, the combiner protrudes upward from the inside of the casing to prevent interference between the combiner and the other cover. Therefore, there is a problem that the combiner cannot be started up and operated immediately.

  The present invention has been made in view of the actual situation of the prior art, and its purpose is to immediately start up the combiner, and to increase the degree of freedom in designing the rear lower part to interfere with other devices. It is an object of the present invention to provide a head-up display device that can prevent the above-described problem.

  In order to achieve the above object, a head-up display device according to the present invention includes a casing in which first and second openings are continuously provided on an upper surface from the front side toward the rear side, and housing inside the casing. A combiner movable between a position and a use position protruding upward from the first opening, and a display light from the light projecting part inside the casing to the combiner at the use position through the second opening A light emitting unit that irradiates, a first cover that can open and close the first opening, a second cover that can open and close the second opening, and a drive that operates the combiner, the first cover, and the second cover Control means, wherein the first cover can be moved forward from a closed position for closing the first opening to be immersed in the casing, and the second cover can be moved forward. It is possible to move forward from a closed position that closes the second opening to be immersed in the casing, and the drive control means moves the combiner to the uppermost position above the use position. The second cover is moved forward, and the combiner is lowered from the uppermost position to the use position after the second cover is immersed in the casing.

  In the head-up display device configured as described above, the first opening provided on the moving path of the combiner is opened by the first cover, and the combiner is irradiated from the light projecting unit of the light emitting unit. The second opening provided in the opening is opened by the second cover, but the second cover is opened across the moving path of the combiner with the combiner moved to the uppermost position above the use position. Therefore, the second cover can be stored inside the casing without interfering with the combiner. Accordingly, the combiner can be immediately started up before the second cover is opened, and both the first and second covers are moved forward and stored in the casing. Interference with other devices can be prevented by increasing the design freedom of the lower part.

  In the above configuration, a pair of guide members for movably supporting the combiner is provided inside the casing, and the width dimension W2 in the left-right direction of the second cover is set to be narrower than the distance W1 between the pair of guide members. When the second cover passes through the lower part of the combiner at the uppermost position and is housed in the casing, interference between the second cover immersed in the casing and the guide member can be prevented. preferable.

  In this case, the support is fixed to the lower end of the combiner, and when the pair of leg pieces protruding from the left and right ends of the support are movably supported by the guide member, the combiner is placed at the uppermost position. It can move stably between positions. In addition, if the width dimension W2 in the left-right direction of the second cover is set to be narrower than the width dimension in the left-right direction of the pair of leg pieces, interference between the second cover and the pair of leg pieces can be prevented.

  According to the head-up display device of the present invention, the combiner can be immediately started up and operated, and the degree of freedom in designing the rear lower portion can be increased to prevent interference with other devices.

It is a perspective view at the time of non-use which shows a head up display device concerning an example of an embodiment of the present invention. It is sectional drawing at the time of non-use of a head-up display apparatus. It is sectional drawing at the time of use of a head-up display apparatus. It is a perspective view which removes a casing from the head-up display apparatus of FIG. 1, and shows. It is a perspective view which shows the principal part of the opening / closing mechanism of the combiner and 2nd cover with which a head-up display apparatus is equipped. It is explanatory drawing which shows the relationship between the guide mechanism of a combiner, and a 2nd cover. It is principal part explanatory drawing of the drive mechanism with which a head-up display apparatus is equipped. It is explanatory drawing which shows the accommodation state of a combiner. It is explanatory drawing which shows the storage completion state of a 1st cover. It is explanatory drawing which shows the state in the middle of starting of a combiner. It is explanatory drawing which shows the state which the combiner moved to the uppermost position. It is explanatory drawing which shows the movement start state of a 2nd cover. It is explanatory drawing which shows the state which the combiner lowered | hung from the uppermost position to the use position. It is explanatory drawing which shows the tilt operation of a combiner.

  DESCRIPTION OF EMBODIMENTS An embodiment of the invention will be described with reference to the drawings. A head-up display device 1 (hereinafter referred to as a HUD device 1) according to this embodiment is arranged on a dashboard ahead of a driver's seat in a passenger compartment. The display device displays vehicle information, navigation information, and the like. In the following description, the Y1-Y2 direction indicated by the arrows in FIG. 1 is the front-rear direction, the X1-X2 direction is the left-right direction, and the Z1-Z2 direction is the up-down direction.

  The HUD device 1 includes an upper case 4 having first and second openings 2 and 3 on the upper surface, a combiner 5 housed inside the upper case 4 and projecting upward from the first opening 2, and an upper part A light emitting unit 6 disposed inside the case 4 and capable of emitting display light to the outside through the second opening 3, a first cover 7 capable of opening and closing the first opening 2, and a second opening 3 being openable And a drive mechanism 9 for operating the combiner 5, the first cover 7, and the second cover 8, and the combiner 5 is stored in the upper case 4 when not in use. The combiner 5 is a pop-up type that protrudes upward from the inside of the upper case 4 when in use.

  The upper case 4 is combined with the lower case 10 to form a hollow casing 11. As shown in FIG. 5, a casing-like chassis 12 is disposed inside the casing 11. The casing 11 is arranged in a recess of the dashboard with the upper surface of the upper case 4 exposed, in which case the second opening 3 is on the near side when viewed from the driver's seat, and the first opening. It arrange | positions so that 2 may face the front side (windshield side).

  The first opening 2 is provided on the moving path of the combiner 5, and the second opening 3 is provided on the optical path irradiated from the light projecting part (described later) of the light emitting unit 6 toward the combiner 5 in the protruding state. ing. The first opening 2 and the second opening 3 are formed continuously from the front side to the rear side, and are rectangular cutouts that share one side with each other, but the first opening 2 is compared to the front-rear direction. Whereas the length in the left-right direction is a much longer lateral shape, the length in the left-right direction of the second opening 3 is set slightly shorter than that of the first opening 2.

  The combiner 5 is a display panel unit composed of a half mirror or the like, and has a shape in which a rectangular transparent plate is gently curved forward. As shown in FIG. 5, a support body 13 is fixed to the lower side portion of the combiner 5, and leg pieces 13 a are projected from both left and right ends of the support body 13. These leg pieces 13a are provided with a shaft portion 13b, a long hole 13c, and a projection 13d, and an operating plate 14 is rotatably connected to the shaft portion 13b. A pair of guide pins 14 a is provided on the outer surface of the operation plate 14, and a connection pin 14 b is provided on the inner surface of the operation plate 14. The connecting pin 14b is movably inserted into the long hole 13c of the leg piece 13a, and the relative angle between the support 13 and the operating plate 14 is defined within a range in which the connecting pin 14b can move through the long hole 13c. . In addition, a first link arm 15 is rotatably connected to the operation plate 14, and a relay gear 16 is fixed to a distal end portion of the first link arm 15. Further, a fan-shaped gear 17 is engaged with the relay gear 16, and the fan-shaped gear 17 is provided with a guide pin 17a.

  As shown in FIG. 2, the light emitting unit 6 is disposed in the lower rear portion of the chassis 12, and the display light emitted from the light emitting unit 6 is a first mirror 18 disposed in the lower front portion of the second opening 3. Is reflected toward the second mirror 19 disposed in the lower rear part of the second opening 3. The second mirror 19 is a portion corresponding to the light projecting portion of the light emitting unit 6, and will be described in detail later. As shown in FIG. 3, when the combiner 5 protrudes from the first opening 2 and is in the use position. The display light of the light emitting unit 6 reflected by the second mirror 19 (light projecting unit) is irradiated to the combiner 5 through the second opening 3.

  As shown in FIG. 7, the first cover 7 has a lid portion 7 a having substantially the same shape as the first opening portion 2, and the distal end portion of the leg piece 7 b protruding from the left and right ends of the lid portion 7 a Guide pins 7c are provided. The first cover 7 is rotatably supported by the chassis 12 around the shaft portion 7d of the leg piece 7b, and the guide pin 7c is inserted into a cam hole of a drive plate described later.

  As shown in FIG. 5, the second cover 8 has a lid portion 8 a having substantially the same shape as the second opening portion 3. Of the leg pieces 8 b protruding from the four corners of the lid portion 8 a, the rear leg The piece 8b is provided with a pair of guide pins 8c. The second link arm 20 is rotatably connected to the leg piece 8 b on the front side of the second cover 8, and a pin 21 is provided at the tip of the second link arm 20.

  As shown in FIG. 4, a pair of first guide members 22 and a pair of second guide members 23 are respectively attached to the left and right side portions of the chassis 12. A guide hole 22a extending in an oblique direction is formed in the first guide member 22, and by inserting the guide pin 14a of the operation plate 14 into the guide hole 22a, the combiner 5, the support 13 and the operation plate 14 are connected. The first guide member 22 is movably supported (see FIG. 7). A guide hole 23a is formed in the second guide member 23, and a guide pin 8c of the second cover 8 is movably inserted into the guide hole 23a.

  Here, as shown in FIG. 6, the width dimension W2 in the left-right direction of the second cover 8 is set narrower than the distance W1 between the opposing first guide members 22, and details will be described later. The second cover 8 is inserted into the casing 11 through a pair of first guide members 22 that movably support the combiner 5. Further, the width dimension W <b> 2 in the left-right direction of the second cover 8 is set to be narrower than the width dimension in the left-right direction of the pair of leg pieces 13 a protruding from the support body 13.

  Further, a drive plate 24 is supported on both left and right sides of the chassis 12 so as to be movable in the front-rear direction. The drive plate 24 is disposed on the side of the combiner 5 from the front side to the rear side of the storage position of the combiner 5. It extends towards. The drive plate 24 is formed with first to third cam holes 24a, 24b, 24c and two guide holes 24d, and guide pins 12a provided in the chassis 12 are movably inserted into the guide holes 24d. ing. Further, a guide pin 7c on the front end side of the first cover 7 is movably inserted into the first cam hole 24a, and a guide pin 17a of the sector gear 17 is movably inserted into the second cam hole 24b. The pin 21 of the second link arm 20 is movably inserted into the third cam hole 24c.

  Therefore, when the drive plate 24 moves in the front-rear direction, the guide pin 7c slides in the first cam hole 24a, so that the first cover 7 rotates about the shaft portion 7d, and accordingly the first cover 7 rotates. The opening / closing operation of one opening 2 can be performed. Further, when the drive plate 24 moves in the front-rear direction in this manner, the guide pin 17a of the sector gear 17 moves along the second cam hole 24b, so that the relay gear 16 rotates as the sector gear 17 rotates. . As a result, the rotation of the relay gear 16 is transmitted to the operation plate 14 via the first link arm 15, and the guide pin 14 a of the operation plate 14 slides in the guide hole 22 a of the first guide member 22. 14 and the support 13 move integrally along the guide hole 22 a, and the combiner 5 held by the support 13 can be moved between the inside of the casing 11 and the outside of the first opening 2. Further, when the drive plate 24 moves in the front-rear direction, the pin 21 slides in the third cam hole 24c, whereby the second link arm 20 is rotated, and accordingly, the guide pin 8c of the second cover 8 is moved. Since it moves along the guide hole 23 a of the second guide member 23, the second cover 8 can be rotated to open and close the second opening 3.

  A rack 24e is formed on the upper surface of the drive plate 24. As shown in FIG. 4, a gear 25 is engaged with the rack 24e. The gear 25 is fixed to both ends of a synchronization shaft 26 extending in the left-right direction of the chassis 12, and when the synchronization shaft 26 rotates with a motor 27 disposed in the lower front portion of the chassis 12 as a drive source, a pair of left and right drive plates 24. Moves in the front-rear direction.

  Further, a pressing protrusion 24f is formed on the upper portion of the driving plate 24. As will be described in detail later, when the driving plate 24 is further moved after the start-up operation of the combiner 5 is completed, the pressing protrusion 24f becomes the protrusion 13d. The combiner 5 can be tilted by rotating the support member 13 in contact with the support member 13. The combiner 5, the first cover 7, and the second cover 8 are provided by the motor 27, the gear 25, the drive plate 24, the fan-shaped gear 17, the relay gear 16, the first and second link arms 15 and 20, the operation plate 14, and the like. A drive mechanism 9 (drive control means) is configured to operate.

  Next, the start-up operation of the combiner 5 in the HUD device 1 configured as described above will be described with reference to FIGS.

  1 and 2 show a non-use state of the HUD device 1. In this non-use state, the first opening 2 and the second opening 3 provided on the upper surface of the upper case 4 are respectively connected to the first cover 7 and the first cover 7, respectively. It is closed by the second cover 8, and the combiner 5 is held at a storage position inside the casing 11. In this case, as shown in FIG. 8, the drive plate 24 is stopped at the advanced position at the left end in the drawing, and the guide pin 7c of the first cover 7 is engaged with the right end portion of the first cam hole 24a in the drawing. The guide pin 17a of the sector gear 17 is engaged with the right end portion of the second cam hole 24b in the drawing, and the pin 21 of the second link arm 20 is engaged with the right end portion of the third cam hole 24c in the drawing. Yes. Further, the guide pin 14a of the operation plate 14 is engaged with the lower end portion of the guide hole 22a of the first guide member 22, and the combiner 5 is stopped at the lowermost position.

  In this state, when the motor 27 is rotationally driven in either the forward or reverse direction, the rotation of the motor 27 is transmitted to the gear 25 via the synchronous shaft 26, so that the drive plate 24 is moved from the forward position toward the backward position in the figure. Start moving in the right direction (arrow A direction). As a result, as shown in FIG. 9, since the guide pin 7c of the first cover 7 moves over the inclined portion of the first cam hole 24a to the upper straight portion, the first cover 7 is centered on the shaft portion 7d. The first opening 2 is opened accordingly.

  When the drive plate 24 starts to move toward the retracted position in this way, the guide pin 17a of the sector gear 17 shifts to the inclined portion of the second cam hole 24b, so that the sector gear 17 is counterclockwise in the drawing. The relay gear 16 rotates clockwise by rotating around. Thereby, the movement of the first link arm 15 fixed to the relay gear 16 is transmitted to the operation plate 14, and the guide pin 14 a of the operation plate 14 moves upward from the lower end portion of the guide hole 22 a of the first guide member 22. Accordingly, the operation plate 14 and the leg piece 13a of the support 13 are integrally moved upward accordingly, and the combiner 5 held by the support 13 starts to rise from the storage position toward the first opening 2.

  When the drive plate 24 continues to move toward the retracted position, as shown in FIG. 10, the guide pin 17a of the sector gear 17 moves in the inclined portion of the second cam hole 24b, so that the combiner 5 opens the first opening. It begins to protrude from the portion 2 to the upper case 4. As shown in FIG. 11, when the guide pin 17a of the sector gear 17 moves beyond the inclined portion of the second cam hole 24b to the lower guide portion, the combiner 5 protrudes most from the first opening 2. During this time, the pin 21 of the second link arm 20 moves within the straight portion of the third cam hole 24c, so that the second cover 8 remains stationary at the position where the second opening 3 is closed. Maintain operating state.

  When the drive plate 24 further moves toward the retracted position after the combiner 5 has moved to the uppermost position in this way, as shown in FIG. 12, the pin 21 of the second link arm 20 is inserted into the third cam hole 24c. In order to shift from the straight portion to the inclined portion, the second link arm 20 rotates counterclockwise in the figure, and the movement is transmitted to the second link arm 20. As a result, the guide pin 8c of the second cover 8 shifts leftward from the right end portion of the guide hole 23a of the second guide member 23 in the figure, so that the second cover 8 rotates forward and the inside of the upper case 4 Along with this, the rear end side of the second opening 3 is gradually opened.

  At this time, the support 13 of the combiner 5 stopped at the uppermost position is above the moving path of the second cover 8, and the space below the combiner 5 is sufficient to avoid interference with the second cover 8. Is secured. And since the width dimension W2 in the left-right direction of the 2nd cover 8 is set narrower than the distance W1 between opposing of a pair of 1st guide members 22 (refer FIG. 6), the 2nd cover 8 is a pair of 1st guide. It passes through the members 22 and enters the casing 11 without interfering with the combiner 5.

  After the second cover 8 is thus housed in the upper case 4 and the drive plate 24 moves further toward the retracted position, the guide pin 17a of the sector gear 17 is moved to the second position as shown in FIG. In order to move in the reversely inclined portion formed in the guide portion of the cam hole 24b, the combiner 5 is lowered from the uppermost position to the use position. Then, by stopping the motor 27 at this time, the start-up operation of the combiner 5 is completed, the combiner 5 is held in the use position protruding from the first opening 2, and the second cover 8 is 2 is housed inside the upper case 4 so that the opening 3 is fully open.

  FIG. 3 shows a use state of the HUD device 1 in which the start-up operation of the combiner 5 is completed. In this use state, when display light is emitted from the light emitting unit 6, the display light is transmitted to the first mirror 18 and the first mirror 18. After being reflected by the two mirrors 19, the combiner 5 is irradiated through the second opening 3. At that time, the first cover 7 is stopped at a position in front of the moving path of the combiner 5, and the second cover 8 is stopped in a state where the front end of the second cover 8 enters the space S that the combiner 5 has exclusively occupied at the storage position. doing.

  The HUD device 1 is provided with a tilt function capable of adjusting the direction of the combiner 5 held at the use position. That is, when the drive plate 24 is further moved from the retracted position shown in FIG. 13 to the right in the drawing after the start-up operation of the combiner 5 is completed, as shown in FIG. Since the 13 projections 13d are pressed, the relative angle between the support 13 and the working plate 14 that are rotatably connected via the shaft portion 13b changes. Thereby, the combiner 5 integrated with the support body 13 rotates centering on the axial part 13b, and the direction of the combiner 5 can be adjusted to a user's desired angle.

  Further, when the combiner 5 that has been started up is immersed in the storage position inside the casing 11, the drive plate 24 is moved from the retracted position shown in FIG. What is necessary is just to move to the advance position shown.

  As described above, in the HUD device 1 according to the present embodiment, the first opening 2 provided on the moving path of the combiner 5 is opened by the first cover 7 and the light projecting unit 6 projects light. The second opening 3 provided on the optical path irradiated to the combiner 5 from the second mirror 19 is opened by the second cover 8, but the combiner 5 is moved to the uppermost position above the use position. In this state, since the second cover 8 is opened and moved across the moving path of the combiner 5, the second cover 8 can be stored inside the casing 11 without interfering with the combiner 5. it can. Therefore, the combiner 5 can be immediately started up before the second cover 8 is opened, and both the first cover 7 and the second cover 8 are moved forward and stored in the casing 11. Therefore, it is not necessary to secure a storage space for the second cover 8 in the lower rear portion of the casing 11, and the entire apparatus can be downsized in the front-rear direction to prevent interference with instruments such as a speedometer.

  In the present embodiment, a pair of first guide members 22 that movably support the combiner 5 are provided inside the casing 11, and the width dimension W2 in the left-right direction of the second cover 8 is a pair of first first. Since the distance W1 between the guide members 22 is set to be narrower, the second cover passes under the combiner 5 moved to the uppermost position and is stored in the casing 11 so as to be immersed in the casing 11. Thus, interference between the second cover 8 and the first guide member 22 can be prevented. In addition, the support 13 is fixed to the lower end portion of the combiner 5, and the pair of leg pieces 13a protruding from the left and right ends of the support 13 are supported by the first guide member 22 so as to be movable. 5 can be stably moved between the storage position and the uppermost position. Furthermore, since the width dimension W2 in the left-right direction of the second cover 8 is set to be narrower than the width dimension in the left-right direction of the pair of leg pieces 13a, interference between the second cover 8 and the pair of leg pieces 13a is also prevented. ing.

  In the above embodiment, the display light of the light emitting unit 6 is reflected by the first mirror 18 and the second mirror 19, and then the combiner 5 is irradiated with the display light using the second mirror 19 as a light projecting unit. Although it is configured, the number of mirrors used is not limited to two. For example, the display light of the light emitting unit 6 may be irradiated to the combiner 5 using only the second mirror 19. Or you may make it irradiate display light directly to the combiner 5 from the light emission unit 6 without using a mirror at all, and the light emission unit 6 will correspond to a light projection part in that case.

1 HUD device (head-up display device)
2 First opening 3 Second opening 4 Upper case 5 Combiner
6 Light emitting unit 7 First cover 8 Second cover 9 Drive mechanism (drive control means)
DESCRIPTION OF SYMBOLS 10 Lower case 11 Casing 12 Chassis 13 Support body 13a Leg piece 14 Actuating plate 15 1st link arm 16 Relay gear 17 Fan-shaped gear 18 1st mirror 19 2nd mirror (light projection part)
20 Second link arm 21 Pin 22 First guide member (guide member)
23 Second guide member 24 Drive plate 24a, 24b, 24c Cam hole 25 Gear 26 Synchronous shaft 27 Motor S Space

Claims (4)

Between the casing in which the first and second openings are continuously provided on the upper surface from the front side to the rear side, and between the storage position inside the casing and the use position protruding upward from the first opening. A movable combiner, a light emitting unit for irradiating display light to the combiner at the use position from a light projecting portion inside the casing through the second opening, and a first cover capable of opening and closing the first opening And a second cover capable of opening and closing the second opening, and a drive control means for operating the combiner, the first cover and the second cover,
The first cover can move forward from a closed position that closes the first opening to be immersed in the casing, and the second cover can move forward from a closed position that closes the second opening. Move and immerse inside the casing;
The drive control means moves the second cover forward in a state where the combiner is moved to the uppermost position above the use position, and after the second cover has entered the casing, the combiner Is lowered from the uppermost position to the use position.   The pair of guide members that movably support the combiner are provided inside the casing according to claim 1, and the width dimension W2 in the left-right direction of the second cover is between the facing of the pair of guide members. A head-up display device characterized in that the head-up display device is set to be narrower than the distance W1.   3. The support according to claim 2, wherein a support is fixed to the lower end of the combiner, and a pair of leg pieces protruding from both left and right ends of the support are supported by the guide member so as to be movable. Head-up display device.   4. The head-up display device according to claim 3, wherein a width dimension W2 in the left-right direction of the second cover is set to be narrower than a width dimension in the left-right direction of the pair of leg pieces.