Screen device

Abstract

To obtain a screen device improved in operability by smoothing the rotation of a winding roller and improved in maintainability by facilitating the attachment / detachment of a screen winding unit to / from a winding box.SOLUTION: A screen device is configured in such a manner of providing a first bracket 11 and a second bracket 12 at one end and the other end in the longitudinal direction of a winding box 6 arranged at one end of a building opening, providing a bearing receiver 24 and a bearing presser 25 in each bracket 11, 12, and attaching 13 to both ends of a winding roller 4 in a screen winding unit 2, sandwiching the bearings 13 between bearing receiver 24 and a bearing presser 25 in the brackets 11, 12 for supporting the winding roller 4 inside the winding box 6 in a rotational and removal manner.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a screen device that is attached to an opening in a building and used for purposes such as shading, heat insulation, or insect control. [Background technology]

[0002] 2. Description of the Related Art Screen devices that are attached to building openings and used for purposes such as shading, heat insulation, or insect control are well known, as shown in Patent Document 1, for example. This type of screen device has a winding roller rotatably attached inside a winding box located at one end of a building opening, and opens and closes the building opening with the screen by winding a screen wound around the winding roller and unwinding it from the winding roller.A coil spring is built into the winding roller, and when the screen is unwound, the coil spring is twisted as the winding roller rotates, accumulating elastic force, and the accumulated elastic force is used to rotate the winding roller in the reverse direction, automatically winding up the screen. Furthermore, the winding roller is rotatably supported by brackets provided at both longitudinal ends of the winding box, but this support structure is usually a sliding bearing structure in which a rotating shaft fits into bearing holes provided on one side of the winding roller and the bracket, and therefore, when the winding roller rotates in conjunction with the unwinding and winding of the screen, a gap between the bearing hole and the rotating shaft can cause rattle, generating noise, and the rattle can increase rotational resistance, making it difficult to operate smoothly.Furthermore, the winding roller is difficult to remove from the winding box during maintenance, making maintenance difficult. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-346707 Summary of the Invention [Problem to be solved by the invention]

[0004] The technical object of the present invention is to provide a screen device that improves operability when opening and closing the screen by smoothing the rotation of the winding roller, and that improves maintainability by making it easy to attach and detach the screen winding unit to the winding box. [Means for solving the problem]

[0005] In order to solve the above problem, the screen device of the present invention comprises a winding box arranged at one end of a building opening, and a screen winding unit detachably attached inside the winding box, the screen winding unit having a screen that opens and closes the building opening, and a winding roller that winds and unwinds the screen, bearings as rolling bearings are attached to one and the other axial ends of the winding roller, and a first bracket provided at one longitudinal end of the winding box and a second bracket provided at the other end are respectively provided with a bearing holder and a bearing presser that is detachable from the bearing holder, and the bearing at one end of the winding roller is sandwiched between the bearing holder and bearing presser of the first bracket of the winding box, and the bearing at the other end of the winding roller is sandwiched between the bearing holder and bearing presser of the second bracket of the winding box, so that the winding roller is rotatably and detachably supported inside the winding box.

[0006] In the present invention, it is desirable that the bearing comprises concentrically arranged annular inner and outer rings and rolling elements interposed between the inner and outer rings, and that the bearing is attached to both ends of the winding roller by press-fitting the roller shafts at one end and the other end of the winding roller into the inner ring, and that the outer ring is sandwiched between the bearing holder and the bearing presser.

[0007] Furthermore, in the present invention, it is preferable that the bearing support and bearing retainer each have a semicircular abutment surface against which the outer peripheral surface of the outer ring of the bearing abuts, the bearing support is attached to the inner surfaces of the first bracket and second bracket of the winding box that face each other, and the bearing retainer is detachably attached to the bearing support.

[0008] The bearing holder may be made of a semicircular member and have mounting surfaces at both ends for attaching the bearing holder, with screw holes formed in the mounting surfaces; the bearing holder may have a semicircular main body and mounting portions connected to both ends of the main body at right angles, with screw insertion holes formed in the mounting portions, and may be attached to the bearing holder by threading mounting screws inserted into the screw insertion holes into the screw holes of the bearing holder.

[0009] In the present invention, preferably, the bearing holders and bearing holders attached to the first bracket and the second bracket have the same configuration, and can be attached to either the first bracket or the second bracket. [Effects of the Invention]

[0010] In the screen device of the present invention, the winding roller is rotatably supported on the winding box via a bearing, so that the winding roller rotates very smoothly when the screen is opened or closed, and problems such as rattle and noise that occur in conventional screen devices that use sliding bearings do not occur. Furthermore, by separating the bearing presser from the bearing holder and removing the bearing 13, the screen winding unit including the winding roller can be easily removed from the winding box, so that if the screen, winding roller, etc. are damaged, they can be easily replaced, and maintenance is also excellent. [Brief explanation of the drawings]

[0011] [Figure 1]1 is a front view showing a first embodiment of a screen unit according to the present invention. [Figure 2] FIG. 2 is an enlarged perspective view of a main part of FIG. 1. [Figure 3] FIG. 3 is an exploded view of FIG. 2. [Figure 4] FIG. 2 is a perspective view of the bottom of the winding box. [Figure 5] FIG. [Figure 6] FIG. 10 is a front view showing a second embodiment of the screen unit according to the present invention. [Figure 7] FIG. 8 is an enlarged perspective view of a main part of FIG. 7. [Figure 8] FIG. 8 is an exploded view of FIG. [Figure 9] FIG. 10 is a schematic diagram showing the winding roller and the wire drum separated to explain the action of the coil spring, and shows the screen in a fully open state. [Figure 10] FIG. 10 is a schematic diagram showing the screen in a half-open state. [Figure 11] FIG. 10 is a schematic diagram showing the screen in a fully closed state. DETAILED DESCRIPTION OF THE INVENTION

[0012] Figures 1 to 4 show a first embodiment of a screen device according to the present invention. The screen device 1A of this first embodiment is a side-opening type screen device that opens and closes a building opening by moving a screen 3 sideways. As shown in Figures 1 and 2, a screen winding unit 2 configured to wind up the screen 3 using a winding roller 4 is detachably attached to a rectangular screen frame 5 attached to the building opening.

[0013] In the present invention, winding the screen 3 onto the winding roller 4 to open an opening in a building is referred to as "opening the screen," and unwinding the screen 3 from the winding roller 4 to close an opening in a building is referred to as "closing the screen" or "closing the screen." Therefore, "opening and closing the screen 3" means "opening and closing the opening in a building with the screen."

[0014] The screen frame 5 has a winding box 6 arranged vertically at one end of the building opening in the left-right direction, an upper horizontal frame rod 7 and a lower horizontal frame rod 8 extending horizontally from the upper and lower ends of the winding box 6 along the upper and lower edges of the building opening, respectively, and a vertical frame rod 9 arranged vertically at the other end of the building opening in the left-right direction.

[0015] The screen winding unit 2 comprises the screen 3, a winding roller 4, and a coil spring 10 that is built into the winding roller 4 and transmits elastic force accumulated by torsion as a rotational force when winding the screen 3 onto the winding roller 4. One axial end (upper end) of the winding roller 4 is supported via a bearing 13 to be rotatable in both directions by a first bracket 11 provided at one end (upper end) of the longitudinal direction (vertical direction) of the winding box 6, and the other axial end (lower end) of the winding roller 4 is supported via a bearing 13 to be rotatable in both directions by a second bracket 12 provided at the other end (lower end) of the longitudinal direction of the winding box 6.

[0016] A movable crosspiece 14 for opening and closing is connected to the tip of the screen 3. The upper and lower ends of this movable crosspiece 14 fit into guide grooves formed in the upper and lower horizontal rods 7 and 8, and are guided by the upper and lower horizontal rods 7 and 8 when the screen 3 is opened or closed.

[0017] The upper and lower ends of the screen 3 are respectively fitted into the upper horizontal frame rod 7 and the lower horizontal frame rod 8. R The inner rail (not shown) is fitted into a slit and moves along the slit when opened and closed. vinegarLocking members 19 are attached to the upper and lower ends of the screen 3, and these locking members 19 are locked onto the inner edges of the slits, so that even if wind pressure or the like acts on the screen 3 when it is closed, the screen 3 is prevented from bending and the upper and lower ends from coming off the upper horizontal frame rod 7 and lower horizontal frame rod 8.

[0018] For example, one of a pair of interlocking teeth of a slide fastener can be used as the locking member 19. A similar tooth is also used to connect the screen 3 and the movable crosspiece 14, and the tip of the screen 3 is inserted into a slit formed in the vertical direction of the movable crosspiece 14, and the locking member 19 consisting of a tooth attached to the tip is locked onto the inner edge of the slit, thereby connecting the screen 3 and the movable crosspiece 14.

[0019] As is clear from FIG. 3, the winding roller 4 has a cylindrical roller body 4a around which the screen 3 is wound, a columnar first roller shaft 4b that is coaxially connected to the upper end of the roller body 4a, and a cylindrical second roller shaft 4c that is coaxially connected to the lower end of the roller body 4a, and the outer diameters of the first roller shaft 4b and the second roller shaft 4c are smaller than the outer diameter of the roller body 4a.

[0020] Inside the winding roller 4, a round rod-shaped spring shaft 21 is housed in the lower half thereof so as to be coaxial and rotatable relative to the winding roller 4, and the coil spring 10 is housed so as to surround the spring shaft 21, with one end (lower end) of the coil spring 10 engaged with the spring shaft 21 and the other end (upper end) of the coil spring 10 engaged with the inner surface of the roller body 4a of the winding roller 4 via a spring holder 22.

[0021] A lower end 21a of the spring shaft 21 has a rectangular cross section and is a square shaft shape that protrudes downward from the lower end of the second roller shaft 4c of the winding roller 4, and as shown in Fig. 4, is engaged with a square hole 23a of a bearing member 23 provided in a second bracket 12 at the lower end of the winding box 6, so that the spring shaft 21 does not rotate together with the winding roller 4 even if the winding roller 4 rotates when the screen 3 is opened or closed. As a result, when the screen 3 is unwound from the winding roller 4 to be closed, the winding roller 4 rotates relative to the spring shaft 21, twisting the coil spring 10 and accumulating an urging force, which acts on the winding roller 4 in the winding direction of the screen 3, so that the screen 3 is automatically wound up by the winding roller 4 when the screen 3 is opened.

[0022] An adjuster 28 is provided on the second bracket 12 so that it can be rotated from both the top and bottom sides of the second bracket 12 using a tool such as a screwdriver. When this adjuster 28 is rotated, the bearing member 23 rotates via a gear (not shown) provided on the second bracket 12, causing the spring shaft 2 to rotate and adjusting the number of turns of the coil spring 10.

[0023] As shown in FIG. 5, the bearing 13 comprises concentrically arranged annular inner and outer rings 13a and 13b, and a plurality of rolling elements 13c made of balls or rollers interposed between the inner and outer rings 13a and 13b. The bearings 13 are attached to the upper and lower ends of the take-up roller 4 by press-fitting the ends of the first roller shaft 4b and the second roller shaft 4c of the take-up roller 4 into the inner ring 13a, respectively. The outer ring 13b of the bearing 13 is sandwiched between a bearing holder 24 attached to the first bracket 11 and the second bracket 12 of the take-up box 6 with mounting screws 27, and a bearing holder 25 detachably attached to the bearing holder 24 with a mounting screw 26, so that the take-up roller 4 is rotatably and detachably supported inside the take-up box 6.

[0024] As shown in FIG. 4, the bearing support 24 is made of a semicircular member and has a semicircular abutment surface 24a against which the outer peripheral surface of the outer ring 13b of the bearing 13 abuts, and is fixed by the mounting screws 27 to the mutually facing inner surfaces of the first bracket 11 at the upper end of the winding box 6 and the second bracket 12 at the lower end, respectively, and screw holes 24c are formed in the mounting surfaces 24b at both ends of the bearing support 24, for threading in mounting screws 26 that attach the bearing holder 25.

[0025] On the other hand, the bearing holder 25 has a semicircular main body 25a having a semicircular abutment surface 25b against which the outer peripheral surface of the outer ring 13b of the bearing 13 abuts, and mounting portions 25c formed on both ends of the main body 25a, with screw insertion holes 25d formed in the mounting portions 25c. With the outer ring 13b of the bearing 13 held between the bearing holder 25 and the bearing receiver 24, mounting screws 26 inserted into the screw insertion holes 25d are screwed into the screw holes 24c formed in the mounting surfaces 24b on both ends of the bearing receiver 24, thereby allowing the bearing holder 25 to be detachably attached to the bearing receiver 24. As shown in Figure 3, by removing the mounting screws 26 and separating the bearing holder 25 from the bearing receiver 24, the winding roller 4, i.e., the screen winding unit 2, can be removed from the winding box 6 together with the bearing 13. In this case, the screen 3 can be removed from the winding box 6 together with the winding roller 4 by separating its tip from the movable crosspiece 14, and then sliding it inside the upper and lower horizontal frame rods 7, 8 and pulling it out from the ends of the horizontal frame rods 7, 8. However, the movable crosspiece 14 can also be removed from the screen frame 5 together with the screen 3 without removing it from the screen 3 itself. When the winding roller 4 and the screen 3 are to be attached to the winding box 6, the operations for removing them are carried out in reverse order.

[0026] A cover that can be opened and closed or separated freely using a hinge is attached to the front of the winding box 6, and the front of the winding box 6 is normally covered by this cover, but the cover is configured to be opened during maintenance or when attaching or detaching the screen winding unit 2, etc., but this cover is not shown in the illustration.

[0027] In the screen unit 1A of the first embodiment, when the screen 3 is moved from a fully open state in which it is completely wound around the winding roller 4 to a fully closed position by unwinding it from the winding roller 4, the coil spring 10 is twisted, and a biasing force is accumulated. When the screen 3 is completely unwound from the winding roller 4 to fully close the building opening, the biasing force accumulated in the coil spring 10 becomes maximum. When the screen 3, which is in the fully closed position, is wound onto the winding roller 4 and released, the spring force accumulated in the coil spring 10 acts on the winding roller 4 in the winding direction of the screen 3, so that the screen 3 is automatically wound up by the winding roller 4.

[0028] In the screen device 1A, the winding roller 4 is rotatably supported on the winding box 6 via the bearing 13, so that the rotation of the winding roller 4 is very smooth when the screen 3 is opened or closed, and problems such as rattle and noise that occur in conventional screen devices using sliding bearings do not occur. Furthermore, when performing maintenance on the screen device 1A, the screen winding unit 2 including the winding roller 4 can be easily removed from the winding box 6 together with the bearing 13 by removing the bearing holder 25 from the bearing support 24 and removing the bearing 13. Therefore, if the screen 3, winding roller 4, etc. are damaged, repair or replacement can be easily carried out, resulting in excellent maintainability.

[0029] 6 to 8 show a second embodiment of the screen unit according to the present invention. The screen unit 1B of this second embodiment differs from the screen unit 1A of the first embodiment in that it has an operating force adjustment mechanism for averaging the operating force when opening and closing the screen 3.

[0030] In the screen unit 1B of the second embodiment, the bearings 13 are attached to the first roller shaft 4b at the upper end of the winding roller 4 and the second roller shaft 4c at the lower end, and the outer rings 13b of these bearings 13 are clamped between a bearing holder 24 and a bearing retainer 25 provided on the first bracket 11 and the second bracket 12 at the upper and lower ends of the winding box 6, thereby allowing the winding roller 4 to be rotatably and detachably supported on the winding box 6, and the upper and lower ends of the screen 3 and the movable crosspiece 14 to be movably supported on the upper and lower horizontal frame rods 7, 8, similar to the screen unit 1A of the first embodiment. Therefore, the same main constituent parts of both units are given the same reference numerals as the screen unit 1A of the first embodiment and their explanations will be omitted, and other configurations that differ from the screen unit 1A will be explained below.

[0031] screen In the device 1B, the first roller shaft 4b is cylindrical, the second roller shaft 4c is columnar, and a spring shaft 29 is rotatably fitted inside the first roller shaft 4b. The lower end of the spring shaft 29 extends into the interior of the roller body 4a, and the upper end of the spring shaft 29 extends upward from the upper end of the first roller shaft 4b and protrudes above a first bracket 11 at the upper end of the winding box 6. For this reason, a notch 11a is formed in the first bracket 11 to allow the upper end of the first roller shaft 4b, which protrudes above the bearing 13, to enter and exit when attaching or detaching the winding roller 4.

[0032] A truncated cone-shaped wire drum 30 is attached to the upper end of the spring shaft 29, and one end of a wire 31 is connected to the wire drum 30. The wire 31 has a single wire portion 31a located on the base end side of a connecting portion 32 and a double wire portion 31b located on the tip end side of the connecting portion 32. The single wire portion 31a is made up of a single wire and is the portion that is wound onto and unwound from the wire drum 30 as the screen is opened and closed. On the other hand, the double wire portion 31b is made up of two wires 31c and 31d. The two wires 31c and 31d of the double wire portion are sequentially looped around guide pulleys 33 provided on the screen frame 5, and the tip of one wire 31c is connected to the upper end of the front surface of the movable crosspiece 14 from the vertical frame rod 9 side, and the tip of the other wire 31d is connected to the lower end of the front surface of the movable crosspiece 14 from the vertical frame rod 9 side.

[0033] 7 and 8, the take-up roller 4 is configured to wind up the screen 3 by rotating clockwise, and the wire drum 30 is configured to wind up the wire 31 in a spiral shape from the large diameter end 30a toward the small diameter end 30b by rotating counterclockwise. For this reason, a spiral groove 30c into which the wound wire 31 fits is formed on the outer circumferential surface of the wire drum 30 so as to extend spirally from the large diameter end 30a toward the small diameter end 30b. Furthermore, the screen 3 and the wire 31 are related to each other such that when the screen 3 is completely wound around the winding roller 4, the wire 31 is completely unwound from the wire drum 30, and when the screen 3 is completely unwound from the winding roller 4, the wire 31 is completely wound around the wire drum 30.

[0034] A coil spring 10 is housed inside the roller body 4a so as to surround the spring shaft 29, with one end (lower end) of the coil spring 10 connected to the spring shaft 29 and the other end (upper end) of the coil spring 10 connected to the first roller shaft 4b (and therefore the winding roller 4). An initial twist is applied to the coil spring 10 by increasing the number of windings of the coil spring 10 when the screen is in a fully open state, that is, when the screen 3 is completely wound around the winding roller 4 and the wire 31 is completely unwound from the wire drum 30 as shown schematically in Figure 9 (initial state).This initial twist causes a biasing force to act on the winding roller 4 and the spring shaft 29 in a direction that unwinds the coil spring 10, so that the winding roller 4 is biased in the direction of arrow a, which is the direction in which the screen 3 is wound up, and the spring shaft 29 is biased in the direction of arrow b, which is the direction in which the wire drum 30 winds up the wire 31.

[0035] Next, the operation of the screen unit 1B of the second embodiment will be described with reference to Figures 9 to 11. For ease of understanding, Figures 9 to 11 are schematic diagrams in which the winding roller 4 and the wire drum 30, which are provided coaxially, are shown separated from each other and the number of turns of the coil spring 10 is reduced.

[0036] In the screen device 1B, when the movable crosspiece 14 is moved leftward in the figure (in the direction of arrow m) from the initial state in which the screen 3 is fully opened as shown in Fig. 9 to unwind the screen 3 from the winding roller 4, the winding roller 4 rotates in the direction of arrow b, twisting the coil spring 10 and causing the spring shaft 29 and wire drum 30 to rotate in the direction of arrow b due to the biasing force of the coil spring 10. Therefore, as shown in Fig. 10 and Fig. 11, the wire drum 30 spirally winds up the wire 31 having a length corresponding to the amount of movement of the movable crosspiece 14 from the large diameter end 30a side toward the small diameter end 30b side of the wire drum 30. At this time, the number of twists (number of turns) of the coil spring 10 may increase or decrease depending on the rotational difference between the winding roller 4 and the spring shaft 29. However, the winding diameter of the screen 3 by the winding roller 4 and the winding diameter of the wire 31 by the wire drum 30 are related so that there is no large difference between them regardless of the opening or closing position of the screen 3. Therefore, the number of turns of the coil spring 10 does not increase or decrease significantly. 910 to the fully closed position in FIG. 11. The operating force required to move the shutter from the fully open position in FIG. 11 through the half open position in FIG. 10 is averaged and does not change significantly.

[0037] Furthermore, when the movable crosspiece 14 is moved to the right in the figure (in the direction of arrow n) to move the screen 3 from the fully closed position in Figure 11 to the fully open position in Figure 9 and wind the screen 3 onto the winding roller 4, the wire 31 is pulled out from the wire drum 30, causing the wire drum 30 and spring shaft 29 to rotate in the direction of arrow a, twisting the coil spring 10, and the resulting biasing force causes the winding roller 4 to rotate in the direction of arrow a and wind up the screen 3. At this time, the number of twists of the coil spring 10 may increase or decrease depending on the difference in rotation between the wire drum 30 and the winding roller 4, but just as when the screen 3 is closed, the winding diameter of the screen 3 by the winding roller 4 and the winding diameter of the wire 31 by the wire drum 30 are related so that there is no large difference between them regardless of the opening or closing position of the screen 3, so the number of turns of the coil spring 10 does not increase or decrease significantly.As a result, the operating force required when winding the screen 3 from the fully closed position in Figure 11, via the half-open position in Figure 10, to the fully open position in Figure 9 is averaged and does not change significantly. Therefore, the spring shaft 29, the coil spring 10, the wire drum 30 and the wire 31 constitute the operating force adjusting mechanism.

[0038] Although the first and second embodiments are directed to a horizontally opening screen device in which the building opening is opened and closed by moving the screen 3 horizontally, the present invention can also be applied to a vertically opening screen device in which the building opening is opened and closed by raising and lowering the screen 3. In this case, the winding box is disposed at the upper or lower end of the building opening, and the winding roller is attached inside the winding box via a bearing so as to be rotatable about a horizontal axis. Furthermore, the present invention is not limited to the type of screen winding system in which the winding roller is rotated by the biasing force of a coil spring as described above, but can also be applied to a manually operated screen device in which the screen is opened and closed by rotating the winding roller with a ball chain. [Explanation of symbols]

[0039] 1A, 1B Screen device 2 Screen winding unit 3 screens 4 Winding roller 4b First roller shaft 4c Second roller shaft 6 Winding box 10 Coil spring 11 First Bracket 12 Second Bracket 13 Bearings 13a Inner Circle 13b outer ring 13c Rolling elements 24 Bearing holder 24a Contact surface 24b Mounting surface 25 Bearing holder 25a Main body 25b Contact surface 25c mounting part 25d screw insertion hole 26,27 Mounting screws

Claims

1. A winding box is provided at one end of the building opening, and a screen winding unit is detachably attached to the inside of the winding box. the screen winding unit includes a screen for opening and closing the building opening, and a winding roller for winding and unwinding the screen, bearings as rolling bearings are attached to one and the other axial ends of the winding roller, a first bracket provided at one end of the winding box in the longitudinal direction and a second bracket provided at the other end of the winding box are provided with a bearing receiver and a bearing presser that is detachable from the bearing receiver, The bearing at one end of the winding roller is sandwiched between a bearing holder and a bearing presser of a first bracket of the winding box, and the bearing at the other end of the winding roller is sandwiched between a bearing holder and a bearing presser of a second bracket of the winding box, so that the winding roller is rotatably and removably supported inside the winding box. A screen device characterized by:

2. The screen device according to claim 1, characterized in that the bearings consist of concentrically arranged annular inner and outer rings and rolling elements interposed between the inner and outer rings, and are attached to both ends of the take-up roller by press-fitting the roller shafts at one end and the other end of the take-up roller into the inner ring, and the outer ring is sandwiched between the bearing support and the bearing presser.

3. the bearing support and the bearing holder each have a semicircular abutment surface against which an outer peripheral surface of an outer ring of the bearing abuts; the bearing support is attached to the inner surfaces of the first bracket and the second bracket of the winding box facing each other; The bearing holder is detachably attached to the bearing holder.

2. The screen device according to claim 1.

4. The bearing holder is made of a semicircular member, and has mounting surfaces at both ends for mounting the bearing holder, and screw holes are formed in the mounting surfaces. The screen device according to claim 3, characterized in that the bearing holder has a semicircular main body portion and mounting portions connected to both ends of the main body portion, a screw insertion hole formed in the mounting portion, and the bearing holder is attached by threading a mounting screw inserted into the screw insertion hole into a screw hole in the bearing holder.

5. 5. The screen device according to claim 1, wherein the bearing holders and the bearing holders attached to the first bracket and the second bracket have the same configuration, and can be attached to either the first bracket or the second bracket.

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