JP6368665B2 - Sheet winding device - Google Patents

Description

  The present invention relates to a sheet winding device that winds a sheet.

  Patent Document 1 below discloses a sheet winding device that winds a sheet such as a tonneau cover for a vehicle. In this sheet winding device, a female spline is formed on the inner periphery of a winding pipe that is formed in a cylindrical shape and winds a sheet. Inside the take-up pipe, a silencer formed in a flexible rectangular tube shape is accommodated. This silencer has four corners engaged with the female spline and rotates integrally with the winding pipe. Inside this silencer is housed a coil spring that applies a winding force to the winding pipe.

  The coil spring has a natural outer diameter that is larger than the diameter of the inscribed circle in the cross section of the silencer in the direction perpendicular to the axis, and is housed inside the silencer with the silencer elastically deformed. Yes. When this coil spring is pre-wound to apply initial torque, the outer diameter of the coil spring is reduced and the silencer is elastically restored. Even in this pre-winding state, the silencer is configured such that the inner circumferential surface of the silencer is kept in close contact with the outer circumferential surface of the coil spring. Further, when the silencer is elastically restored as described above, the diameter of the circumscribed circle in the cross section in the direction perpendicular to the axis of the silencer is expanded, and the four corners of the silencer are stably supported by the female spline. From the above, it is possible to prevent or suppress the occurrence of rattling between the coil spring and the silencer and between the silencer and the winding pipe, and to prevent or suppress the occurrence of abnormal noise caused by the rattling. Yes.

JP 2014-226969 A

  However, in the sheet winding device having the above configuration, when the coil spring is inserted into the inside of the silencer formed in a rectangular tube shape, the four sides in the cross section in the direction perpendicular to the axis of the silencer are bent so as to expand to the outside of the silencer. Therefore, the insertion operation becomes complicated.

  In view of the above facts, an object of the present invention is to obtain a sheet winding device that contributes to prevention or suppression of abnormal noise generation and facilitates insertion of a coil spring inside a silencer.

The sheet winding apparatus according to the first aspect of the present invention is supported in a rotatable manner with respect to the case, takes up the sheet by rotating around one axis, and pulls out the sheet by rotating around the other axis. The winding shaft is coaxially disposed inside the winding shaft, one end is locked to the winding shaft, the other end is locked to the case, and the winding shaft is rotated around the axis. A coil spring that is biased toward one side and whose outer diameter changes with the winding and the drawing, and a cylindrical body that is coaxially interposed between the coil spring and the winding shaft The coil spring is supported so as to be integrally rotatable with respect to the take-up shaft, and is in contact with the coil spring on both sides in the short direction in the cross section perpendicular to the axis. The elastic deformation while maintaining the state, By an external force from both sides in the longitudinal direction it is applied in the plane, equipped with a silencer which is capable enlarged outer diameter and over the same in the natural state of the coil spring the diameter of a circle inscribed in the cross section, In the silencer, plate-like detent projections extending radially outward from the outer peripheral surface on both sides in the longitudinal direction in the cross section are engaged with recesses formed on the inner peripheral surface of the winding shaft. .

  In the sheet winding apparatus according to claim 1, the silencer that is a cylindrical body is coaxial between the cylindrical winding shaft that winds the sheet and the coil spring that is disposed inside the winding shaft. Is intervening. The silencer is supported so as to be integrally rotatable with respect to the winding shaft, and is in contact with the coil spring on both sides in the short direction in the cross section perpendicular to the axis. The silencer is elastically deformed while maintaining the above contact state following the change in the outer diameter of the coil spring accompanying the winding and drawing of the sheet with respect to the winding shaft. Thereby, it is possible to prevent or suppress the occurrence of backlash between the coil spring and the silencer.

  Moreover, when the outer diameter of the coil spring that pulls the sheet from the winding shaft and urges the winding shaft to one side around the axis (winding direction of the sheet) is reduced, the silencer While the portions approach each other, both side portions in the longitudinal direction in the cross section are separated from each other and approach the inner peripheral surface of the winding shaft. Thereby, in the use state of the sheet | seat with which the sheet | seat was pulled out from the winding shaft, it can prevent or suppress that a backlash arises between a silencer and a winding shaft. From the above, it contributes to preventing or suppressing the occurrence of abnormal noise caused by such play.

Furthermore, the above-mentioned silencer can expand the diameter of the circle inscribed in the cross section to the same or larger than the outer diameter in the natural state of the coil spring by applying external force from both sides in the longitudinal direction in the cross section perpendicular to the axis. It is said that. Thereby, when inserting a coil spring inside a silencer, a coil spring can be easily inserted inside a silencer by applying external force to a silencer as mentioned above.
Further, the silencer can be rotated integrally with the take-up shaft by the engagement of the rotation preventing projection and the recess. In this silencer, the sheet is pulled out from the winding shaft and the outer diameter of the coil spring is reduced, so that both side portions in the longitudinal direction approach the inner peripheral surface of the winding shaft. It can be satisfactorily engaged with the recess.

  A sheet winding apparatus according to a second aspect of the present invention is the sheet winding apparatus according to the first aspect, wherein the silencer is configured such that when the sheet is pulled out from the winding shaft, both sides in the longitudinal direction in the cross section are caused by its own elastic return force. The portion is pressed against the inner peripheral surface of the winding shaft.

  In the sheet winding apparatus according to claim 2, when the sheet is pulled out from the winding shaft and the outer diameter of the coil spring is reduced, both side portions in the longitudinal direction in the cross section in the direction perpendicular to the axis of the silencer Pressed against the circumference. Thereby, in the use state of the sheet | seat with which the sheet | seat was pulled out from the winding shaft, it can prevent that a backlash arises between a silencer and a winding shaft.

The sheet winding device according to a third aspect of the present invention is the sheet winding device according to the first or second aspect , wherein the silencer has an oval shape in cross section in its natural state.

In the sheet winding device according to the third aspect , the silencer is formed in an oval shape (such as an oval or a rounded rectangle) in a cross-sectional shape in the direction perpendicular to the axis in its natural state. Thereby, compared with the case where the said cross-sectional shape of a silencer is made into a rhombus or a rectangle, for example, the outer diameter of a coil spring can be set large.

  As described above, the sheet winding device according to the present invention contributes to preventing or suppressing the generation of abnormal noise and contributing to facilitating insertion of the coil spring inside the silencer.

It is a disassembled perspective view which shows the tonneau cover apparatus as a sheet winding apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the sheet winding part with which the same tonneau cover device is equipped partly broken and shows. It is sectional drawing which shows the cross section of the same axis | shaft orthogonal | vertical direction of the sheet | seat winding part, (A) is a figure which shows the natural state of a coil spring, (B) is a figure which shows the state by which the coil spring was pre-wound. . (A) is sectional drawing which shows the cross section of the axis orthogonal direction in the silencer of a natural state, (B) is sectional drawing which shows the state in which the external force was applied from the both sides of the longitudinal direction with respect to the silencer. It is sectional drawing which shows the cross section of the axis orthogonal direction of the silencer applied to a modification, (A) is a silencer applied to a 1st modification, (B) is applied to a 2nd modification. It is a silencer.

  A tonneau cover device 10 as a sheet winding device according to an embodiment of the present invention will be described with reference to FIGS. The tonneau cover device 10 is mounted on a vehicle. An arrow FR appropriately shown in FIGS. 1 and 2 indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow RH indicates the vehicle right direction. Is shown. Hereinafter, in the case of simply describing “left” or “right”, the direction with respect to the vehicle is indicated.

(Constitution)
As an example, the tonneau cover device 10 shown in FIG. 1 is provided in a luggage compartment at the rear of a vehicle (not shown), and is disposed adjacent to the upper rear portion of the rear seat. The tonneau cover device 10 includes a case 12, a winding pipe (winding shaft) 14 supported so as to be rotatable with respect to the case 12, a tonneau cover (sheet) 16 wound around the winding pipe 14, and a winding pipe. 14 includes a coil spring 18 that urges 14 to one side around the axis, and a silencer 20 interposed between the winding pipe 14 and the coil spring 18.

  The case 12 includes a long case body 22 arranged with the vehicle width direction as a longitudinal direction, a pair of left and right holders 24 and 26 attached to both ends of the case body 22 in the longitudinal direction, An inner cover 28 attached to one end portion (right end portion) in the longitudinal direction and a compression coil spring 30 disposed between the inner cover 28 and the holder 26 on the right side of the vehicle are provided.

  The case main body 22 is formed in a substantially rectangular tube shape by, for example, a sheet metal, and a cross-sectional shape viewed from the vehicle width direction has a substantially C shape. The case main body 22 is arranged with the open-side outlet 22A facing the rear of the vehicle.

  The left and right holders 24 and 26 are made of, for example, resin, and have a substantially box shape opened toward the center in the vehicle width direction. The left holder 24 is formed with a substantially cylindrical support shaft 24A that protrudes toward the vehicle width direction center side (vehicle right side). These holders 24 and 26 and a plurality of screws 32 are attached to both ends in the longitudinal direction of the case body 22. The left holder 24 is fixed so as not to move relative to the case main body 22, and the right holder 26 can move relative to the case main body 22 within a predetermined range in the vehicle width direction. These holders 24 and 26 are fitted to recesses (not shown) formed on both sides of the front end portion of the luggage compartment, for example, and supported by the vehicle body.

  The inner cover 28 is made of, for example, resin, and closes an opening at one end (right end) in the longitudinal direction of the case body 22. The inner cover 28 is attached to the right end portion of the case main body 22 by, for example, a plurality of protrusions fitting inside the case main body 22. The inner cover 28 is housed in the right holder 26 together with the right end portion of the case main body 22. The inner cover 28 is formed with a substantially cylindrical support shaft 28A that protrudes toward the vehicle width direction center side (vehicle left side). The support shaft 28A has the vehicle width direction as an axial direction, and is arranged coaxially with the support shaft 24A described above.

  The compression coil spring 30 is accommodated in the right holder 26 and is disposed between the bottom wall portion of the right holder 26 and the inner cover 28. The compression coil spring 30 urges the right holder 26 toward the vehicle right side (vehicle width direction outer side) and absorbs backlash between both side portions of the luggage compartment and the case 12.

  As described above, the winding pipe 14 is rotatably supported by the case 12 having the above configuration. The winding pipe 14 is formed in a cylindrical shape by metal, for example, and is accommodated inside the case body 22 with the vehicle width direction as an axial direction (longitudinal direction). One end portion (left end portion) in the axial direction of the winding pipe 14 is pivotally supported on the support shaft 24A described above via a cylindrical collar 34 made of resin. Similarly, the other axial end portion (right end portion) of the winding pipe 14 is pivotally supported by the support shaft 28A described above via a cylindrical collar 36 made of resin. Thereby, the winding pipe 14 is supported rotatably with respect to the case 12.

  One end 16 </ b> A of the tonneau cover 16 is locked (joined) to the outer periphery of the winding pipe 14 by an adhesive tape 27. The tonneau cover 16 is a sheet-like (planar) member having flexibility, and the winding pipe 14 is rotated in one direction around the axis (in the direction of arrow X in FIG. 2). The outer periphery is wound in layers.

  The tonneau cover 16 is inserted through the outlet 22A of the case main body 22, and a drawer portion 38 made of resin is attached to the other end 16B of the tonneau cover 16. Stoppers 38A are provided at both left and right ends of the drawer portion 38, respectively. These left and right stoppers 38 </ b> A come into contact with the edge of the outlet 22 </ b> A of the case body 22 when the tonneau cover 16 is wound around the winding pipe 14. Further, when the drawing portion 38 is pulled toward the vehicle rear side, the winding pipe 14 rotates in the other direction around the axis (the direction opposite to the arrow X direction in FIG. 2), and the tonneau cover 16 is pulled out from the winding pipe 14. It is like that.

  The pulled-out tonneau cover 16 has left and right stoppers 38A hooked on hooking portions (not shown) provided on both sides of the rear end portion of the cargo compartment. As a result, the tonneau cover 16 is held in a state of being pulled out from the winding pipe 14. This state is the usage state of the tonneau cover 16 (the usage state of the seat).

  As shown in FIG. 2, a female spline 40 is formed on the inner peripheral surface of the winding pipe 14 by arranging a plurality of concave portions (V-shaped grooves) 40 </ b> A in the circumferential direction. A locking member 42 is arranged on the left end side (one end side in the axial direction) inside the winding pipe 14. On the outer peripheral surface of the locking member 42, a plurality of inverted V-shaped convex portions 44A are arranged side by side in the circumferential direction to form a male spline 44. The male spline 44 is fitted to the female spline 40 of the winding pipe 14. As a result, the locking member 42 can rotate integrally with the winding pipe 14.

  A coil spring 18 (torsion coil spring; winding spring) is coaxially disposed inside the winding pipe 14. One end (left end) 18A of the coil spring 18 is locked to the winding pipe 14 using a locking member 42, and the other end (right end) 18B is a support shaft 28A (that is, a case) of the inner cover 28. 12).

  The coil spring 18 is pre-wound in order to apply an initial torque for winding the tonneau cover 16 around the take-up pipe 14 when the tonneau cover apparatus 10 is manufactured. That is, the coil spring 18 is assembled together with the case 12 by rotating the one end portion 18 </ b> A relative to the other end portion 18 </ b> B by a plurality of turns (for example, 45 turns) around the central axis of the coil spring 18. Thereby, the winding pipe 14 is urged by the coil spring 18 to one side around the axis (winding direction of the tonneau cover 16).

  3A shows a state before the coil spring 18 is pre-wound (natural state; no load state), and FIG. 3B shows the coil spring 18 being pre-wound. The state (pre-winding state) is shown. In this pre-winding state, the outer diameter of the coil spring 18 is smaller than that in the natural state. For example, the outer diameter D2 (see FIG. 3B) of the coil spring 18 in the pre-winding state is reduced by about 0.46 mm from the outer diameter D1 of the coil spring 18 in the natural state (see FIG. 3A). .

  The coil spring 18 is wound and tightened when the tonneau cover 16 is pulled out from the winding pipe 14, and the outer diameter is reduced. And in the use state of the tonneau cover 16 mentioned above, the outer diameter of the coil spring 18 is reduced to the same extent as the pre-winding state (a slightly larger diameter than the pre-winding state). Further, when the tonneau cover 16 is wound around the winding pipe 14 and stored in the case 12, the outer diameter of the coil spring 18 is approximately the same as the natural state (slightly smaller than the natural state). That is, the outer diameter of the coil spring 18 changes (expands / contracts) with the winding and drawing of the tonneau cover 16 with respect to the winding pipe 14.

  A silencer 20 is interposed between the coil spring 18 and the winding pipe 14. The silencer 20 is configured as a long cylindrical body having flexibility and made of a soft resin material, and is arranged coaxially with respect to the winding pipe 14 and the coil spring 18. The silencer 20 has an oval (elliptical) cross-sectional shape in the direction perpendicular to the axis in its own natural state (no load state) (see FIG. 4A). As shown in FIGS. 3A and 3B, the silencer 20 has both sides in the short direction (short axis direction; vertical direction in FIGS. 3A to 4B) in the cross section. , A pair of spring contact portions 20 </ b> B that are part of the inner peripheral surface is in contact with the outer peripheral surface of the coil spring 18. 4A and 4B, the cross section of the silencer 20 is not hatched in order to make the drawing easy to see.

  Further, as shown in FIGS. 3A and 3B, the silencer 20 has a longitudinal direction in the cross section (long axis direction; left and right direction in FIGS. 3A to 4B). On both sides, the coil spring 18 is separated from the outer peripheral surface. A gap 46 is formed between each side portion of the silencer 20 in the long axis direction and the coil spring 18. The pair of gaps 46 are configured to exist in any state of the coil spring 18 in a natural state (see FIG. 3A) and a pre-winding state (see FIG. 3B). In the natural state of the spring 18, the pair of gaps 46 are reduced as compared with the pre-winding state of the coil spring 18.

  The silencer 20 is formed with a pair of anti-rotation protrusions 20A on both sides of the cross section in the long axis direction. These anti-rotation protrusions 20 </ b> A are ridges extending in the axial direction of the silencer 20, and protrude from the outer peripheral surface of the silencer 20. These anti-rotation protrusions 20 </ b> A are arranged symmetrically with respect to the long axis and the short axis in the cross section, and engage with the recess 40 </ b> A of the female spline 40 of the winding pipe 14. Thereby, the silencer 20 is supported so that it can rotate integrally with the winding pipe 14.

  As shown in FIG. 4A, the silencer 20 has an inner diameter in the short axis direction in its natural state set to be smaller than an outer diameter D <b> 2 in the pre-wound state of the coil spring 18. When the coil spring 18 is inserted inside the silencer 20, an external force is applied to the silencer 20 from both sides in the long axis direction (see arrows F1 and F2 in FIG. 4B). By applying the external forces F1 and F2 in this way, the silencer 20 is elastically deformed so that the dimension in the major axis direction decreases and the dimension in the minor axis direction increases.

  As a result, as shown in FIG. 4B, the inner diameter in the short axis direction of the silencer 20 is equal to or greater than the outer diameter D1 in the natural state of the coil spring 18 (in this embodiment, larger than the outer diameter D1). ) Enlarged. That is, the silencer 20 can expand the diameter of the circle inscribed in the cross section in the direction perpendicular to the axis to be equal to or larger than the outer diameter D1 in the natural state of the coil spring 18 by applying an external force from both sides in the long axis direction. It is said that. Then, the coil spring 18 is inserted inside the silencer 20 with the inner diameter in the short axis direction of the silencer 20 enlarged as described above.

  The silencer 20 having the coil spring 18 inserted therein as described above elastically deforms following the change in the outer diameter of the coil spring 18 described above. Accordingly, the silencer 20 is configured to always maintain the state of being in contact with the outer peripheral surface of the coil spring 18 on both sides in the short axis direction. In other words, the silencer 20 is maintained in contact with the outer peripheral surface of the coil spring 18 on both sides in the short axis direction even when the outer diameter of the coil spring 18 is reduced by pre-winding, and the coil spring 18 is rotated by its own elastic restoring force. The spring 18 is configured to be urged toward the center axis.

  Similarly, even when the tonneau cover 16 is pulled out from the take-up pipe 14 and the tonneau cover 16 is in use, the silencer 20 is kept in contact with the outer peripheral surface of the coil spring 18 on both sides in the minor axis direction. In addition, when the tonneau cover is used, the silencer 20 takes up the pipe contact portion 20C (see FIG. 3B), which is a part of the outer peripheral surface, on both sides in the long axis direction by its own elastic restoring force. 14 is configured to be pressed against the inner peripheral surface.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  In the tonneau cover device 10 configured as described above, a silencer 20 that is a cylindrical body is coaxially interposed between a winding pipe 14 that winds up the tonneau cover 16 and a coil spring 18 that is disposed inside the winding pipe 14. doing. The silencer 20 is supported so as to be integrally rotatable with the take-up pipe 14 and is in contact with the coil spring 18 on both sides in the short axis direction in the cross section perpendicular to the axis. In addition, the silencer 20 is elastically deformed while maintaining the contact state following the change in the outer diameter of the coil spring 18 accompanying the winding and drawing of the tonneau cover 16 with respect to the winding pipe 14. Thereby, it is possible to prevent or suppress the occurrence of backlash between the coil spring 18 and the silencer 20.

  Moreover, when the tonneau cover 16 is pulled out from the take-up pipe 14, the outer diameter of the coil spring 18 that urges the take-up pipe 14 around one axis (in the sheet take-up direction) is reduced. As a result, both sides of the silencer 20 in the short axis direction in the cross section approach each other, while both side parts in the long axis direction in the cross section are separated from each other and approach the inner peripheral surface of the winding pipe 14. Thereby, in the use state of the tonneau cover 16 in which the tonneau cover 16 is pulled out from the take-up pipe 14, it is possible to prevent or suppress the occurrence of play between the silencer 20 and the take-up pipe 14. From the above, it contributes to preventing or suppressing the occurrence of abnormal noise caused by such play.

  That is, for example, even when a vehicle equipped with the tonneau cover device 10 travels on a rough road and the tonneau cover device 10 largely moves up and down, the play of the coil spring 18 with respect to the silencer 20 and the backlash of the silencer 20 with respect to the winding pipe 14 are eliminated. Suppression is suppressed. This contributes to prevention or suppression of abnormal noise generation.

  Further, the silencer 20 is configured such that external forces F1 and F2 (see FIG. 4B) are applied from both sides in the long axis direction in the cross section perpendicular to the axis, thereby reducing the diameter of the circle inscribed in the cross section to the coil spring. The outer diameter D1 in the 18 natural state can be expanded to the same or larger. Thereby, when inserting the coil spring 18 inside the silencer 20, the coil spring 18 can be easily inserted inside the silencer 20 by applying an external force to the silencer 20 as described above. As a result, for example, productivity at the time of mass production of the tonneau cover device 10 can be improved.

  In the present embodiment, the silencer 20 uses its own elastic return force when the tonneau cover 16 is pulled out from the take-up pipe 14, that is, when the outer diameter of the coil spring is reduced as described above. Both side portions in the long axis direction are pressed against the inner peripheral surface of the winding pipe. As a result, it is possible to prevent backlash between the silencer 20 and the take-up pipe 14, which further contributes to prevention or suppression of abnormal noise generation.

  Further, in the present embodiment, the silencer 20 has a plurality of anti-rotation protrusions 20A protruding from the outer peripheral surface on both sides in the long axis direction in the recess 40A of the female spline 40 formed on the inner peripheral surface of the winding pipe 14. Is engaged. As a result, the silencer 20 can rotate integrally with the winding pipe 14. Since the tonneau cover 16 is pulled out from the winding pipe 14 and the outer diameter of the coil spring 18 is reduced in the silencer 20, both side portions in the longitudinal direction approach the inner peripheral surface of the winding pipe 14. The plurality of anti-rotation protrusions 20A can be satisfactorily engaged with the recesses 40A of the female spline 40.

  In the present embodiment, the silencer 20 has an oval (oval) cross-sectional shape in the direction perpendicular to the axis. Thereby, compared with the case where the cross-sectional shape of the silencer 20 in the direction orthogonal to the axis is a rhombus or a rectangle, for example, the outer diameter of the coil spring 18 can be set larger. Thereby, it contributes to improving the freedom degree of the design of the silencer 20 and the coil spring 18.

  Further, in the present embodiment, the silencer 20 urges the coil spring 18 toward the central axis with an elastic return force even when the coil spring 18 is pre-wound. For this reason, it contributes to the improvement of the effect which prevents or suppresses the rattling of the coil spring 18 with respect to the silencer 20.

  As described above, the tonneau cover device 10 according to the present embodiment contributes to the prevention or suppression of abnormal noise generation and also facilitates the insertion of the coil spring 18 inside the silencer 20. In the present embodiment, for example, in the existing tonneau cover device, the above-described effect can be obtained only by changing the shape of the silencer. Therefore, an increase in manufacturing cost can be prevented or suppressed.

(Supplementary explanation of the embodiment)
Although the case where the present invention is applied to the tonneau cover device 10 for a vehicle has been described in the above embodiment, the present invention is not limited to this. The present invention is also applicable to other types of sheet take-up devices such as a sunshade device in which one end of a light shielding sheet is attached to a take-up pipe and a blind device in which one end of a blind as a sheet is attached to a take-up pipe. Applicable.

  Moreover, in the said embodiment, although the cross-sectional shape of the silencer 20 in the direction orthogonal to the axis was an oval, the present invention is not limited to this. For example, the cross-sectional shape may be a rounded rectangle. Moreover, the silencer should just be a cylindrical thing with which the longitudinal direction and the transversal direction were orthogonal in the cross section of an axial orthogonal direction, The cross-sectional shape can be changed suitably.

  For example, like the silencer 50 (first modification) shown in FIG. 5A, the cross-sectional shape in the direction perpendicular to the axis may be a substantially hexagonal shape. Further, for example, as in the silencer 60 (second modified example) shown in FIG. 5B, the cross-sectional shape in the direction perpendicular to the axis may be a substantially octagonal shape. In the silencers 50 and 60 shown in FIGS. 5A and 5B, for example, by engaging the corners 50A and 60A in the cross section in the direction perpendicular to the axis with the recess 40A of the winding pipe 14. The anti-rotation protrusion 20A in the above embodiment can be omitted.

  Moreover, in the said embodiment, although the rotation prevention protrusion 20A of the silencer 20 was made into the structure formed in the both sides of the major axis direction (longitudinal direction) in the cross section of the silencer 20 at the axis orthogonal direction, this invention is limited to this. is not. In other words, the silencer rotation-preventing protrusions may be formed on both sides in the short direction in the cross section of the silencer in the direction perpendicular to the axis. However, in that case, it is necessary to allow elastic deformation of the silencer on both sides in the short direction, for example, by deeply forming a recess in the inner peripheral surface of the take-up pipe with which the anti-rotation protrusion of the silencer engages.

  As a modification of the above embodiment, the silencer 20 is elastically returned to the initial shape with the coil spring pre-wound (that is, the contact state with the coil spring 18 is maintained by elastic return). However, it is also possible to set so that the coil spring 18 is not biased toward the central axis.

  Although an example of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. . In addition, the configurations described in the embodiment and the supplementary explanation can be implemented by being combined as appropriate.

10 Tonneau cover device (sheet winding device)
12 Case 14 Winding pipe (winding shaft)
16 Tonneau cover (sheet)
18 Coil spring 20 Silencer 20A Non-rotating protrusion 40A Concave

Claims (3)

A cylindrical winding shaft that is rotatably supported with respect to the case, winds the sheet by rotation around one axis, and pulls out the sheet by rotation around the other axis;
It is coaxially arranged inside the winding shaft, one end is locked to the winding shaft, the other end is locked to the case, and the winding shaft is biased to one side around the axis. And a coil spring whose outer diameter changes with the winding and withdrawing,
The tubular body is coaxially interposed between the coil spring and the winding shaft, and is supported so as to be integrally rotatable with respect to the winding shaft. The two sides of the coil spring are in contact with the coil spring, follow the change in the outer diameter and elastically deform while maintaining the contact state, and an external force is applied from both sides in the longitudinal direction in the cross section, A silencer capable of expanding a diameter of a circle inscribed in a cross section to be equal to or larger than an outer diameter of the coil spring in a natural state ,
In the silencer, plate-like detent projections extending radially outward from the outer peripheral surface on both sides in the longitudinal direction in the cross section are engaged with recesses formed on the inner peripheral surface of the winding shaft. Sheet winding device.
2. The sheet according to claim 1, wherein the silencer presses both side portions in the longitudinal direction in the cross section against the inner peripheral surface of the winding shaft by its own elastic restoring force when the sheet is pulled out from the winding shaft. Winding device.
The sheet winder according to claim 1 or 2 , wherein the silencer has an oval shape in its cross section in its natural state.

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