Sheet mechanism

Abstract

To provide a sheet mechanism whose abnormal noise and rattling upon winding / unwinding a sheet member can be suppressed, whose fixed shaft is not complicated, and whose manufacturing cost can remain in cost-effectiveness.SOLUTION: A sheet mechanism 1 includes a flexible sheet member 2, a rotating body 6 to which one end of the sheet member 2 is directly or indirectly attached and at least whose end is hollow, and a fixed shaft 4 inserted into the hollow portion at the end of the rotating body 6 to rotatably support the rotating body 6. The sheet member 2 can be wound up and unwound around the fixed shaft 4 by moving the other end back and forth along one direction A. The fixed shaft 4 has a ridge 4a on its outer circumferential surface that extends in a longitudinal direction C of the fixed shaft 4, and the ridge 4a is located on a diameter that extends in a direction intersecting the one direction A of the fixed shaft 4.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a seat mechanism. [Background technology]

[0002] In one example of a conventional seat mechanism such as a sunshade for an automobile, one end of a sheet material is attached to a rotating body, and the rotating body is rotatably supported by a fixed shaft located in a hollow portion provided at least at the end. The other end of the sheet material is advanced and retreated in one direction, so that the sheet material can be wound up and unwound around the fixed shaft. In general, the fixed shaft is made of a resin molded product, and a convex parting line is generated during molding.

[0003] Parting lines of such shaft parts are exemplified in Patent Documents 1 and 2. In the configuration described in Patent Document 1, a barrel provided in an air outlet of an automobile rotates in the vertical direction around a barrel shaft molded integrally with the barrel. A non-contact portion that does not contact the inner surface of the bearing hole is formed on the side of the barrel shaft along the axial direction, and a parting line is provided only on the non-contact portion.

[0004] The vehicle sun visor described in Patent Document 2 has a sun visor body and a support shaft with a circular cross section that mounts the sun visor body to the vehicle body. The sun visor body is mounted rotatably around the support shaft, and a biasing and holding member provided on the sun visor body contacts the outer surface of the support shaft to bias and hold the support shaft, thereby applying a predetermined rotation resistance to the rotation of the sun visor body around the support shaft. The support shaft has an intersecting parting line that extends a predetermined length in a direction intersecting with the longitudinal axis of the support shaft in a sliding area where the biasing and holding member slides when the biasing and holding member rotates around the support shaft together with the sun visor body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 63-15322 [Patent Document 2] Patent No. 6034221 Summary of the Invention [Problem to be solved by the invention]

[0006] In conventional seat mechanisms such as vehicle shades, abnormal noises and rattling may occur when the seat material is wound or unwound, causing discomfort to the user. One of the causes of abnormal noises and rattling is that the parting line, which is a protrusion located on the outer circumferential surface of the fixed shaft, comes into contact with the inner circumferential surface of the hollow part of the rotating body. However, the configurations described in Patent Documents 1 and 2 are not seat mechanisms, and therefore are not intended to suppress abnormal noises and rattling when the seat material is wound or unwound.

[0007] In particular, the barrel described in Patent Document 1 rotates less than one rotation (less than 360 degrees) around the barrel axis, and the vehicle sun visor described in Patent Document 2 has a configuration in which the sun visor body and the biasing holding member rotate less than one rotation (less than 360 degrees) around the support shaft. Therefore, for example, in Patent Document 1, a non-contact portion that does not contact the inner surface of the bearing hole exists along the axial direction on the side portion of the barrel axis, and a parting line can be provided only on the non-contact portion. In contrast, in a seat mechanism such as an automobile shade, when the sheet material is wound or unwound around a fixed shaft, the barrel rotates one rotation or more (360 degrees or more) around the fixed shaft. Therefore, there is no non-contact portion that extends along the axial direction and does not contact the inner surface of the barrel on the side portion of the rotating shaft. Therefore, it is not possible to arrange the parting line in the same manner as in Patent Document 1.

[0008] Furthermore, a parting line extending in a direction intersecting with the longitudinal axis direction is formed on the spindle of Patent Document 2. Such a parting line cannot be formed by a normal mold design and requires a special mold design, which complicates the manufacture of the spindle and increases the manufacturing cost.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a sheet mechanism that can suppress abnormal noise and rattling when winding and unwinding sheet material, and that does not require complicated manufacturing of the fixed shaft and can keep manufacturing costs low. [Means for solving the problem]

[0010] The sheet mechanism of the present invention comprises a flexible sheet material, a rotating body to which one end of the sheet material is directly or indirectly attached and at least the end is hollow, and a fixed shaft inserted into the hollow portion of the end of the rotating body to rotatably support the rotating body, wherein the sheet material can be wound up and unwound around the fixed shaft by moving the other end back and forth along one direction, and the fixed shaft has a protrusion on its outer peripheral surface extending in the longitudinal direction of the fixed shaft, and the protrusion is located on a diameter of the fixed shaft extending in a direction intersecting the one direction. The fixed shaft may be a resin molded product, and the protrusion may be a parting line. The rotating body may include a rotating shaft to which one end of the sheet material is fixed, and a hollow barrel inserted into an end of the rotating shaft, the barrel being fitted into at least one end of the rotating shaft so that the rotating shaft and the barrel can rotate integrally, and the sheet material may be wound and unwound by the integral rotation of the rotating shaft and the barrel. The sheet material may be a screen having light-shielding properties, and the one direction may be a vertical direction. Effect of the Invention

[0011] According to the sheet mechanism of the present invention, abnormal noise and rattling during winding and unwinding of the sheet material can be suppressed, and manufacturing of the fixed shaft is not complicated, so manufacturing costs can be kept low. [Brief description of the drawings]

[0012] [Figure 1] 1A is a front view of a seat mechanism according to an embodiment of the present invention with the sheet material spread out, and FIG. 1B is a front view of the seat mechanism with the sheet material rolled up. [Diagram 2] FIG. 2 is an exploded perspective view of the seat mechanism shown in FIG. [Diagram 3] 2 is a cross-sectional view of a main part of the seat mechanism shown in FIG. 1. [Figure 4] FIG. 2 is a perspective view of one fixed shaft of the seat mechanism shown in FIG. 1. [Diagram 5] 1A is a cross-sectional view of a main part of a seat mechanism of a comparative example, FIG. 1B is a cross-sectional view of a main part of another example of the seat mechanism of the comparative example, and FIG. [Figure 6] FIG. 6 is a perspective view of one fixed shaft of the seat mechanism shown in FIG. 5. [Figure 7] 11 is a cross-sectional view illustrating a modified example of the seat mechanism of the present invention. FIG. [Figure 8] FIG. 11 is an exploded perspective view of another modified example of the seat mechanism of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1(A) shows a front view of a seat mechanism 1 according to an embodiment of the present invention in a state where the sheet material 2 is spread out, and FIG. 1(B) shows a front view of a state where the sheet material 2 is rolled up. FIG. 2 shows an exploded perspective view of the seat mechanism 1. FIG. 3 shows a cross-sectional view of the main parts of the seat mechanism 1 (fixed shaft 4, rotating body 6, and the surrounding parts). The seat mechanism 1 of this embodiment has a flexible sheet material 2, a hollow barrel 3, a fixed shaft 4, and a rotating shaft 5 having at least both ends hollow. The sheet material 2 of this embodiment is a screen having a light-shielding property used as a sunshade (shade) for an automobile. Specifically, one end 2a of the sheet material 2 is fixed to the outer periphery of the rotating shaft 5. A hollow barrel 3 is inserted into each end of the rotating shaft 5. The inner peripheral surface of both ends of the rotating shaft 5 is formed with uneven portions 5a, and the outer peripheral surface of the barrel 3, which is inserted into the rotating shaft 5, is formed with uneven portions 3a having a shape complementary to the uneven portions 5a of the rotating shaft 5. When the barrel 3 is inserted into the rotating shaft 5, the uneven portions 5a and 3a engage with each other. As a result, the rotating shaft 5 and the barrel 3 form a rotating body 6 that rotates integrally. Fixed shafts 4 are inserted into the hollow portions of the barrel 3 located at both ends of the rotating shaft 5. The barrel 3 and the fixed shaft 4 are slidable relative to each other, and the barrel 3 is supported rotatably relative to the fixed shaft 4. In this way, one end 2a of the sheet material 2 is indirectly fixed to the barrel 3 via the rotating shaft 5. The other end 2b of the sheet material 2 is a free end, to which a frame portion 7 and a gripping portion 8 are attached. When the other end 2b of the sheet material 2 is advanced or retreated in one direction (direction A, for example, the vertical up-down direction), the rotating shaft 5 and barrel 3 rotate about the fixed shaft 4, and the sheet material 2 is wound up or unwound. Specifically, the user can spread the sheet material 2 by holding the gripping portion 8 and pulling it, and when the user releases his / her hand from that state, the sheet material 2 is wound up around the fixed shaft 4 and the rotating shaft 5 by a return mechanism (not shown).

[0014] 4 shows a perspective view of the fixed shaft 4 located on the left side of FIGS. 1 and 2. The fixed shaft 4 is a resin molded product, and a parting line 4a is formed during molding. The parting line 4a in this embodiment is a protrusion located on a diameter D1 extending in a direction (direction B) perpendicular to the forward and backward direction (direction A) of the sheet material 2 on the outer circumferential surface of the fixed shaft 4, and extending in the longitudinal direction (direction C) of the fixed shaft 4. Due to such an arrangement of the parting line 4a, the sheet mechanism 1 of this embodiment can suppress abnormal noise and rattling when the sheet material 2 is wound up and unwound. This point will be described below.

[0015] In a conventional seat mechanism 1 for a vehicle shade or the like, when the sheet material 2 is wound up and unwound, noise and rattling may occur, causing discomfort to the user. One of the causes is thought to be that the parting line 4a, which is a protrusion on the outer peripheral surface of the fixed shaft 4, abuts against the inner peripheral surface 3b of the barrel 3. In a configuration in which the barrel 3 rotates one revolution or more (360 degrees or more) relative to the fixed shaft 4, it is impossible to arrange the parting line 4a so that it does not abut against the inner peripheral surface 3b of the barrel 3. However, in a configuration in which the sheet material 2, one end 2a of which is directly or indirectly fixed to the barrel 3, is pulled in one direction (direction A) to rotate the rotating shaft 5 and the barrel 3, the applicant has found that the outer peripheral surface of the fixed shaft 4 has a portion that abuts against the inner peripheral surface of the barrel 3 with a strong force and a portion that abuts against the inner peripheral surface of the barrel 3 with a not so strong force. In other words, when the sheet material 2 is pulled in one direction (direction A), the barrel 3 is pulled in the same direction accordingly. As a result, the inner peripheral surface 3b of the barrel 3 abuts with strong force against the outer peripheral surface of the fixed shaft 4 on the side opposite to the direction in which it is pulled. Also, when the sheet material 2 is wound up by a return mechanism (not shown), the inner peripheral surface 3b of the barrel 3 abuts strongly against the outer peripheral surface of the fixed shaft 4 on the side being pulled. As an example, when the sheet material 2 is pulled vertically upward as it is spread, the inner peripheral surface 3b of the lower part of the barrel 3 abuts strongly against the outer peripheral surface of the lower part of the fixed shaft 4. When the sheet material 2 returns vertically downward as it is wound up, the inner peripheral surface 3b of the upper part of the barrel 3 abuts strongly against the outer peripheral surface of the upper part of the fixed shaft 4. Based on this finding, if the parting line 4a exists on the outer peripheral surface of the fixed shaft 4 on the diameter D2 parallel to the advancing / retracting direction (direction A) of the sheet material 2 as in the comparative example shown in Figures 5 and 6, the inner peripheral surface 3b of the lower or upper part of the barrel 3 will strongly abut against the parting line 4a on the outer peripheral surface of the fixed shaft 4 in accordance with the advancing / retracting of the sheet material 2, and there is a high possibility that loud abnormal noise and rattling will occur. In particular, in the case where the barrel 3 is provided with a step portion 3c as shown in Figures 5(B) and 5(C), it is considered that the parting line 4a will hit the step portion 3c with a strong force, causing louder abnormal noise and rattling.Therefore, in this embodiment, the parting line 4a of the fixed shaft 4 is disposed on the outer peripheral surface of the fixed shaft 4 on a diameter D1 extending in a direction (direction B) perpendicular to the advancing and retreating direction (direction A) of the sheet material 2. In this configuration, the direction (direction A) in which the barrel 3 is moved when the sheet material 2 advances and retreats in the direction A does not coincide with the direction in which the parting line 4a and the inner peripheral surface 3b of the barrel 3 abut, but are perpendicular to each other. Therefore, even if the inner peripheral surface 3b of the barrel 3 abuts against the parting line 4a on the outer peripheral surface of the fixed shaft 4 when the sheet material 2 advances and retreats in the direction A, the force applied to each other is small. This makes it possible to reduce abnormal noise and rattling.

[0016] The parting line 4a is generated at the joint portion when multiple dies (not shown) are closed during molding. The fixed shaft 4 located on the left side in Figs. 1-2 has an attachment plate portion 4b integrally formed thereon as shown in Figs. 1, 2, and 4, and the attachment plate portion 4b has an attachment hole 4c through which a screw, a pin, or the like is inserted. In order to mold the fixed shaft 4 integrally formed with the attachment plate portion 4b having the attachment hole 4c, a convex portion for molding the attachment plate portion 4b is provided on the die (not shown), and the die is designed so that the extension direction of the convex portion coincides with the opening and closing direction of the die in order to smoothly remove the convex portion from the molded product when the die is opened after molding. As a result, in the past, as shown in Figs. 5 and 6, the parting line 4a is generated on the outer circumferential surface of the fixed shaft 4 on a diameter D2 extending in a direction perpendicular to the opening direction of the attachment hole 4c, i.e., parallel to the extension direction of the attachment plate portion 4b. However, in this embodiment, as described above, abnormal noise and rattling are suppressed by locating the parting line 4a on the diameter D1 extending in the direction (direction B) perpendicular to the forward and backward direction (direction A) of the sheet material 2. To achieve this, the fixed shaft 4 is molded using a die having a known slide mechanism, or the position of the mounting hole 4c is changed.

[0017] In the above embodiment, the parting line 4a is arranged on a diameter D1 extending in a direction (direction B) perpendicular to the advancing and retracting direction (direction A) of the sheet material 2, but the present invention is not limited to this configuration. That is, as shown in FIG. 7, the parting line 4a may be arranged on a diameter extending in a direction intersecting the advancing and retracting direction (direction A) of the sheet material 2. Specifically, even if the parting line 4a is arranged at any position on the outer circumferential surface of the fixed shaft 4 within a range E (shown by a dot pattern) of +45 degrees to -80 degrees with respect to the direction (direction B) perpendicular to the advancing and retracting direction (direction A) of the sheet material 2 as viewed from the center of the fixed shaft 4, it is included in the present invention because it can obtain a certain degree of effect in suppressing abnormal noise and rattling. In addition, the side where the sheet material 2 is drawn in is represented by a positive angle, and the opposite side is represented by a negative angle as viewed from the direction (direction B) perpendicular to the advancing and retracting direction (direction A) of the sheet material 2. Considering that the allowable error range of the general pulling direction of the sheet material 2 is ±10 degrees, as described above, it is preferable that the parting line 4a is present within the range E of +45 degrees to -80 degrees with respect to the direction (direction B) perpendicular to the advancing and retreating direction (direction A) of the sheet material 2. Also, as shown in Fig. 8, the rotating shaft 4 and barrel 3 constituting the rotating body 6 may be integrated, that is, the rotating shaft 5 constitutes the rotating body 6, and both ends thereof may be barrel-shaped with hollow portions 5b. [Explanation of symbols]

[0018] 1 Seat mechanism 2 Sheet material 2a one end 2b other end 3 barrels 3a Uneven part 3b Inner surface 3c Step 4 Fixed axis 4a Parting line (ridge) 4b Mounting plate 4c Mounting hole 5 Rotation Axis 5a Uneven part 5b Hollow part 6 Rotating Body 7 フレームBU 8. Grip

Claims

1. The rotating device has a flexible sheet material, a rotating body to which one end of the sheet material is directly or indirectly attached and at least the end is hollow, and a fixed shaft that is inserted into the hollow portion of the end of the rotating body to rotatably support the rotating body, the sheet material can be wound up and unwound around the fixed shaft by moving the other end of the sheet material forward and backward in one direction; A seat mechanism, characterized in that the fixed shaft has a protrusion on its outer peripheral surface extending in the longitudinal direction of the fixed shaft, the protrusion being located on a diameter of the fixed shaft extending in a direction intersecting the one direction.

2. 2. The seat mechanism according to claim 1, wherein the fixed shaft is a resin molded part, and the protrusion is a parting line.

3. 3. The sheet mechanism according to claim 1 or 2, wherein the rotating body includes a rotating shaft to which the one end of the sheet material is fixed and a hollow barrel inserted into an end of the rotating shaft, the barrel being fitted into at least one end of the rotating shaft so that the rotating shaft and the barrel can rotate integrally, and the sheet material is wound and unwound by the integral rotation of the rotating shaft and the barrel.

4. 4. The seat mechanism according to claim 3, wherein the sheet material is a screen having a light-shielding property, and the one direction is a vertical direction.

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