Seat opening / closing device

Abstract

To rotate an input shaft with a handle part without switching engagement between gears, reduce a load in a low-speed deceleration mode when winding up a sheet attached to an output shaft, and switch the mode to a high-speed constant-speed mode when unwinding the sheet, thereby enhancing work efficiency.SOLUTION: A sheet opening / closing operation device is configured to: in a case of a constant-speed mode in which the rotation of an output shaft 6 is equal to the rotation of an input shaft 4, operate a switching lever 2b to integrally rotate a rotary member 10, a planetary gear holding member 9 and the input shaft 4 around the input shaft 4, and transmit the rotation of the planetary gear holding member 9 to the output shaft 6; and in a case of a deceleration mode in which the rotation of the output shaft 6 is less than the rotation of the input shaft 4, operate the switching lever 2b to stop the rotation of the rotary member 10, convert the rotation of the input shaft 4 into planetary motion by planetary gear groups 9d to 9g between a sun gear 4a provided on the input shaft 4 and an internal gear 10f of the rotary member 10, and transmit the rotation of the planetary gear holding member 9 to the output shaft 6.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a sheet opening and closing operation device capable of changing the opening and closing speed when opening and closing a vinyl sheet in, for example, a greenhouse. [Background technology]

[0002] Conventionally, when a vinyl sheet wound around a shaft is used for insulation and shading in greenhouses etc. and is opened and closed up and down by operating a handle, gravity is added, especially when winding it up, making the operation difficult for an operator with weak strength.

[0003] Patent Document 1 discloses a two-speed rotation transmission device that can change the speed when unwinding and winding up a sheet, for example by performing unwinding at a high speed and winding up at a low speed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2010-187686 Summary of the Invention [Problem to be solved by the invention]

[0005] The device of Patent Document 1 has the advantage that although the vinyl sheet is wound up slowly, it can be operated without requiring a great deal of force, and can be unwound at high speed.

[0006] However, when changing speed, the drive gear 6a must be switched to the internal gear 5b or the planetary gears 7, etc., and if this switching is repeated, these gears will be damaged and their durability will be compromised. Also, since speed switching is not possible during unwinding or winding, unwinding or winding must be stopped before switching the gear meshing.

[0007] The object of the present invention is to provide a sheet opening and closing device which does not require switching of the meshing of gears when changing speed, which can reduce the load on the handle portion by using a low-speed deceleration mode when winding up the sheet, and which can switch to a high-speed constant speed mode when winding down to increase work efficiency, which allows easy speed change operation, and which is highly durable. [Means for solving the problem]

[0008] In order to achieve the above object, the sheet opening / closing operation device according to the present invention is a sheet opening / closing operation device which transmits the rotation of an input shaft rotated by a handle portion to an output shaft connected to a sheet roll by a speed change mechanism at a constant speed in a constant speed mode or at a reduced speed in a reduced speed mode, the speed change mechanism having an operation portion capable of switching between the constant speed mode and the reduced speed mode, the speed change mechanism having a master gear integral with the input shaft, a group of speed change gears consisting of a plurality of gears arranged around the master gear, a gear shaft portion of each gear of the group of speed change gears rotatably held, and the output shaft is embedded The transmission includes a speed change gear holding member, and a connection switching member that switches the connection between the input shaft and the speed change gear holding member according to the constant speed mode or the deceleration mode by operating the operating unit, and in the constant speed mode in which the output shaft and the input shaft rotate at the same speed, the input shaft and the speed change gear holding member are connected as one unit by the connection switching member, and the rotation of the input shaft is transmitted to the output shaft via the speed change gear holding member, and in the deceleration mode in which the rotation of the output shaft is reduced below the rotation of the input shaft, the input shaft and the speed change gear holding member are separated by the connection switching member, and the rotation of the original gear of the input shaft is reduced in speed and rotated by the group of speed change gears and transmitted to the speed change gear holding member, and transmitted to the output shaft via the speed change gear holding member. Effect of the Invention

[0009] When the sheet opening / closing device according to the present invention is used in an opening / closing device for a sunshade sheet for a greenhouse or the like, for example, when the sheet is wound up by the reel against gravity by rotating the handle, that is, when the rotational load is large, the rotational speed of the output shaft can be switched to a slow deceleration mode, which reduces the rotational load on the handle accordingly and allows the handle to be rotated easily. Conversely, when the sheet is to be unwound, that is, when the constant speed mode is used where the rotational load on the output shaft is small, the speed can be switched to high speed to unwind the sheet.

[0010] In addition, speed changes can be made without interrupting the operation even while the sheet is being unwound or wound up. Also, since the gears are constantly meshed with each other, there is no need to change the gear mesh when changing the speed, and damage to the gears is minimal. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is an external perspective view of a seat opening / closing operation device according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of components in a constant velocity mode according to the first embodiment. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is a perspective view of a planetary gear holding member. [Figure 6] FIG. 4 is a rear perspective view of the circumferential member. [Figure 7] FIG. 2 is a cross-sectional view of components in a deceleration mode according to the first embodiment. [Figure 8] FIG. 4 is an explanatory diagram of a seat opening / closing operation device in use. [Figure 9] FIG. 11 is a cross-sectional view of components in a constant velocity mode according to the second embodiment. [Figure 10] FIG. [Figure 11] FIG. 11 is a cross-sectional view of components in a deceleration mode according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will now be described in detail with reference to the illustrated embodiments. EXAMPLES

[0013] 1 is an external perspective view of the seat opening / closing device of Example 1. Reference numeral 1 denotes a two-piece casing made of, for example, synthetic resin, with a grip 2 provided on one side, a switching mechanism 3 functioning as a speed change mechanism, an end of an input shaft 4, and a handle 5 connected to the input shaft 4 provided on one side, and an output shaft 6 protruding from the other side.

[0014] Furthermore, a post insertion hole 7 for inserting a post P is provided in the vertical direction near the grip 2 of the casing 1. An operating unit 2a consisting of a grip is incorporated into the inner circumference of the grip 2, and the seat opening / closing operating device is operated by moving the switching lever 2b to operate the switching mechanism unit 3 in the constant speed mode or the deceleration mode.

[0015] Figure 2 is a cross-sectional view of the components inside the casing 1, and Figure 3 is an exploded perspective view. Two parallel plates 8a, 8b fixed to the casing 1 are arranged inside the casing 1. A holding plate 6a that holds an output shaft 6 is attached to the parallel plates 8a, 8b, and the substantially cylindrical output shaft 6 rotatably protrudes outside the parallel plate 8a, and the output shaft 6 is provided with a fixing hole 6b through which a bolt that connects a winding shaft, described later, is inserted.

[0016] As shown in FIG. 4, the output shaft 6 is provided on the parallel plate 8b side opposite the output shaft 6. from A rectangular shaft 6c having a square cross section protrudes from the shaft, and a guide hole 6d having a circular cross section is drilled in the center of the rectangular shaft 6c. The output shaft 6 between the parallel plates 8a and 8b is surrounded by a control mechanism 8c to prevent the output shaft 6 from rotating freely. Furthermore, a total of four rollers 7a to 7d (7c and 7d are not shown) are arranged around the support insertion hole 7 between the parallel plates 8a and 8b on the top, bottom, left and right sides to smoothly guide the support P in the vertical direction.

[0017] A planetary gear holding member 9, which is a speed change gear holding member, is disposed on the tip side of the square shaft 6c. As shown in Fig. 5(a), the central portion of the surface of the circular metallic base plate 9a of the planetary gear holding member 9 on the side of the square shaft 6c is made thick, and a square hole 9b into which the square shaft 6c fits is formed. Also, as shown in Fig. 5(b), a planetary gear group 9d-9g, which is a speed change gear group consisting of, for example, four metallic planetary gears each having a rotation axis 9c on the same circumference, is rotatably held on the opposite surface of the base plate 9a.

[0018] A cylindrical metal input shaft 4 is arranged on the planetary gear set 9d-9g side of the planetary gear holding member 9 with its center line aligned with the output shaft 6, and a sun gear 4a, which is a master gear and is a part of the planetary gear mechanism made of metal external teeth, is provided at the end of the input shaft 4. The sun gear 4a is commonly meshed with the inside of each of the planetary gear sets 9d-9g. A flange portion 4b is provided on the shaft side of the sun gear 4a, and a rod-shaped guide shaft 4c protrudes from the axial end of the sun gear 4a to be inserted into a guide hole 6d of the square shaft 6c for axis alignment. Furthermore, the shaft portion of the input shaft 4 is provided with two protrusions 4d and 4e that protrude from both sides and fit into a part of the switching mechanism 3 described later, a screw hole 4f for fixing a part of the switching mechanism 3, and a fixing hole 4g ​​for fixing the handle portion 5.

[0019] A rotating member 10 having a cylindrical portion 10a at its front portion that covers the sun gear 4a and the planetary gear group 9d to 9g is disposed around the sun gear 4a and the planetary gear group 9d to 9g. As shown in Fig. 6, the rear surface of the rotating member 10 is a circular back plate 10b, and an annular groove 10c into which the flange portion 4b of the input shaft 4 is rotatably fitted is provided at the front side of the back plate 10b. A cylindrical portion 10d into which the input shaft 4 is rotatably inserted is provided at the center of the rear portion of the back plate 10b facing rearward. Six grooves 10e, for example, are formed at equal intervals on the outer periphery of the cylindrical portion 10d along the axial direction.

[0020] A metallic internal gear 10f serving as an orbital gear of the planetary gear mechanism is disposed along the inner circumference of the cylindrical portion 10a of the rotating member 10 and meshes with the outer sides of each of the planetary gear sets 9d-9g in common, and the number of teeth of this internal gear 10f is set to 32, which is four times the number of teeth of the sun gear 4a, for example, 8. Also, the number of teeth of each of the planetary gear sets 9d-9g is set to 8, the same as the sun gear 4a.

[0021] The rotating member 10 is surrounded by the upper and lower side surfaces of a fixed cover member 11 having a U-shaped cross section. The output shaft 6 side of the fixed cover member 11 is fixed to the parallel plate 8b with a screw, and the fixed cover member 11 is fixed to the casing 1. The rear surface of the fixed cover member 11 is a closing plate 11a, and a cam plate 11b is fixed to the rear surface of the closing plate 11a. The closing plate 11a and the cam plate 11b are provided with holes 11c and 11d through which the cylindrical portion 10d of the rotating member 10 is inserted, and four cam grooves 11e, for example, are formed radially at equal intervals around the hole 11d of the cam plate 11b. The cam plate 11b is provided with a fulcrum 11f that supports the switching lever 2b.

[0022] The input shaft 4 is inserted into the cylindrical portion 10d of the rotating member 10, the flange portion 4b fits into the annular groove 10c, and the cylindrical portion 10d is inserted into the hole portion 11c of the fixed cover member 11, thereby positioning the input shaft 4 in a predetermined position.

[0023] A connection switching member 12 movable along the input shaft 4 is disposed behind the fixed cover member 11 as part of the switching mechanism 3. The connection switching member 12 has a circular front plate 12a at the front, a cylindrical portion 12b at the center, and a circular rear plate 12c at the rear. A hole 12e through which the tubular portion 10d of the rotating member 10 is inserted is provided at the center of the connection switching member 12, and six cam teeth 12f that fit into the groove portion 10e of the tubular portion 10d are provided around the hole 12e. Four cam teeth 12g that fit into the cam groove 11e of the fixed cover member 11 are formed on the outer periphery of the front plate 12a.

[0024] A substantially annular rotation transmission member 13 is disposed behind the connection switching member 12. The input shaft 4 is inserted into this rotation transmission member 13 via a hole 13a, and the rotation transmission member 13 is fixed by screwing into a screw hole 4f of the input shaft 4 via a fixing hole 13b. Cam teeth 13c are formed around the hole 13a on the front surface of the rotation transmission member 13 and protrude forward. The cam teeth 13c are adapted to fit into grooves between the cam teeth 12f of the connection switching member 12. Furthermore, deep recesses 13d, 13e are formed at two locations between the teeth of the cam teeth 13c, into which the protruding projections 4d, 4e of the input shaft 4 fit, respectively.

[0025] An end 2c of the switching lever 2b is connected to the operating part 2a of the grip 2. When the grip 2 is gripped and the operating part 2a is pulled toward the user, the switching lever 2b rotates around a fulcrum 11f provided on the cam plate 11b, and the tip 2d of the switching lever 2b located on the cylindrical part 12b of the connection switching member 12 separates the connection switching member 12 from the rotation transmission member 13 along the input shaft 4. The front plate 12a of the connection switching member 12 fits into the cam teeth 12g and the cam groove 11e of the fixed cover member 11, and the connection switching member 12 is connected to the cam plate 11b of the fixed cover member 11.

[0026] In addition, two return coil springs 2e are attached to the switching lever 2b between the fixed cover member 11, and when the operating part 2a is not being operated, the switching lever 2b is urged in the opposite direction to when the operating part 2a is being gripped, connecting the connection switching member 12 to the rotation transmission member 13.

[0027] In this manner, the connection switching member 12 switches the freely connectable and disconnectable connection between the input shaft 4 and the planetary gear holding member 9, which is a speed change gear holding member, to either a constant speed mode or a deceleration mode by operating the switching lever 2b.

[0028] In the assembled state of this seat opening / closing operation device, the sun gear 4a of the input shaft 4 meshes with the inside of the planetary gear group 9d-9g of the planetary gear holding member 9. The input shaft 4 is also inserted through a rotating member 10, a fixed cover member 11, a connection switching member 12, and a rotation transmission member 13. The projections 4d, 4e of the input shaft 4 fit into the recesses 13d, 13e of the rotation transmission member 13, and the rotation transmission member 13 is fixed to the input shaft 4 by a screw via a screw hole 4f, so that the rotation transmission member 13 rotates integrally with the input shaft 4.

[0029] In the constant velocity mode when the operating part 2a is not being operated, that is, when the operating part 2a of the grip 2 is not being gripped, as shown in FIG. 2, the switching lever 2b to which a biasing force is applied by the return coil spring 2e pushes the connection switching member 12 rearward along the input shaft 4 toward the rotation transmission member 13, so that the rear plate 12c of the connection switching member 12 comes into contact with the front surface of the rotation transmission member 13.

[0030] In this state, the cam teeth 13c of the rotation transmission member 13 fit into the cam teeth 12f of the connection switching member 12, and the connection switching member 12 rotates with the rotation of the rotation transmission member 13, i.e., the input shaft 4. The cam teeth 12f of the connection switching member 12 are constantly fitted into the groove portion 10e of the cylindrical portion 10d of the rotating member 10, so that the rotation of the input shaft 4 is transmitted to the rotating member 10, and the rotating member 10 rotates together with the input shaft 4 around the input shaft 4.

[0031] In this case, the sun gear 4a of the input shaft 4 and the internal gear 10f of the rotating member 10 rotate at the same speed, so the planetary gear set 9d-9g interposed between them are fixed and do not rotate individually. Therefore, the rotation of the input shaft 4 and the rotating member 10 is transmitted to the base plate 9a of the planetary gear holding member 9 via each rotating shaft 9c of the planetary gear set 9d-9g, and is further transmitted to the square shaft 6c of the output shaft 6 via the square hole 9b at the same rotation speed, and rotation is performed in a constant speed mode.

[0032] In this way, when the handle section 5 connected to the input shaft 4 using the fixing hole 4g ​​is rotated without operating the operating section 2a of the grip 2, the input shaft 4 to which the rotation of the handle section 5 is transmitted and the planetary gear holding member 9 rotate at a uniform speed of 1:1, so that the output shaft 6 also rotates in the same direction as the input shaft 4 in a uniform speed mode with a rotation ratio of 1:1 via the planetary gear holding member 9. Note that even if you release your hand from the handle section 5 at this point, the output shaft 6 will not start rotating unexpectedly because sudden rotation of the output shaft 6 is braked by the braking mechanism 8c.

[0033] On the other hand, when the operating part 2a of the grip 2 is gripped, the deceleration mode is entered, and as shown in Fig. 7, the end 2c of the switching lever 2b is pulled by the operating part 2a, and the tip 2d operates against the biasing force of the return coil spring 2e, moving the connection switching member 12 along the input shaft 4 toward the front fixed cover member 11 side from which it had been separated until then. Due to this movement, the connection switching member 12 separates from the rotation transmission member 13 and is released from fixation to the rotation transmission member 13, and the cam teeth 12g of the front plate 12a of the connection switching member 12 fit into the cam groove 11e of the fixed fixed cover member 11. This disables the connection switching member 12 from rotating, and since the cam teeth 12f of the connection switching member 12 fit into the groove portion 10e of the rotating member 10, the rotating member 10 is also disabled from rotating.

[0034] When the input shaft 4 is rotated by the handle portion 5, the rotation is transmitted to the planetary gear set 9d-9g via the sun gear 4a. The rotational motion caused by the meshing of the sun gear 4a and the planetary gear set 9d-9g with the rotation of the input shaft 4 becomes planetary gear motion between the internal gear 10f of the fixed rotating member 10, and is transmitted to the planetary gear holding member 9. The rotation ratio between the input shaft 4 and the planetary gear holding member 9 is, for example, 1:4, which is the gear ratio between the sun gear 4a and the internal gear 10f. In other words, the rotation of the input shaft 4 is decelerated by the planetary gear mechanism, and the rotation transmitted from the planetary gear holding member 9 to the output shaft 6 rotates at a speed ratio reduced to 1:4 with respect to the rotation of the input shaft 4.

[0035] In this way, by using the planetary gear mechanism, the rotation speed of the output shaft 6 caused by the input shaft 4 is reduced to, for example, 1 / 4, and the rotational load applied to the handle portion 5 connected to the input shaft 4 can be reduced to 1 / 4. Therefore, although the rotation of the output shaft 6 is slower, even if the operator has weak strength, the handle portion 5 can be easily operated.

[0036] 8 shows the opening and closing operation device of this Example 1 being used to rotate the reel S of a vinyl sheet B for a greenhouse. The support P is inserted into the support insertion hole 7 of the sheet opening and closing operation device to secure the casing 1, and the reel S is secured to the output shaft 6. When the grip 2 is held with the left hand and the handle portion 5 with the right hand, and the handle portion 5 is turned left to unwind the vinyl sheet B in constant speed mode without operating the operation portion 2a of the grip 2, no planetary gear motion is performed and the output shaft 6 rotates at the same speed as the input shaft 4 with a 1:1 rotation ratio. In this case, due to the gravity acting on the vinyl sheet B, the vinyl sheet B can be unwound at high speed without requiring a large operating force.

[0037] In this state, the vinyl sheet B can also be rolled up by turning the handle portion 5 to the right; however, this requires rolling up the vinyl sheet B against the force of gravity, which requires a large operating force.

[0038] When the operating portion 2a of the grip 2 is grasped to set the machine to deceleration mode, the connection switching member 12 is moved via the switch lever 2b to connect the machine to the fixed cover member 11, and the handle portion 5 is turned to the right with the rotating member 10 fixed, the rotational load on the input shaft 4 is reduced to one-quarter due to planetary gear motion. When winding up the vinyl sheet B, the reel S can be easily rotated via the output shaft 6 without requiring a large operating force.

[0039] Also, vinyl sheet B can be wound down in this deceleration mode, but while no operating force is required, it takes time to wind down.

[0040] When winding up of the vinyl sheet B is finished and grip on the operating part 2a is released, the biasing force of the return coil spring 2e causes the switch lever 2b to rotate about the fulcrum 11f, and the tip 2d moves the connection switching member 12 towards the rotation transmission member 13, entering the constant speed mode, as shown in Figure 2. As a result, the connection switching member 12 separates from the cover member 11 and the fixed state of the rotating member 10 is released, so that the rotating member 10 rotates together with the output shaft 6 at the same speed as the input shaft 4. EXAMPLES

[0041] In the second embodiment, a spur gear group 20 is used instead of the planetary gear group 9d to 9g in the first embodiment. Fig. 9 is a cross-sectional view of components in the constant velocity mode of the second embodiment, and the same reference numerals as those in the first embodiment indicate the same members.

[0042] The spur gear group 20, which is a group of speed change gears, has a plurality of gears journalled on the rotating plates 21a and 21b between them, the rotating plates 21a and 21b being made of two parallel circular plates which are speed change gear holding members. A cylindrical portion 10d similar to that of the first embodiment is fixed to the rear rotating plate 21b. The bases of the cylindrical portions 10d of the rotating plates 21a and 21b are rotatably inserted into holes 11c of a fixed cover member 11 fixed to the parallel plate 8b, thereby holding the spur gear group 20. The input shaft 4 has a flange portion 4b rotatably inserted into a hole 21c provided in the rotating plate 21b, and the input shaft 4 is rotatably inserted into the cylindrical portion 10d.

[0043] 10 is a perspective view of the spur gear group 20, with the rotating plates 21a and 21b indicated by dotted lines. An original gear 4h is provided at the tip of the input shaft 4, and large-diameter gears 22a and 22b that mesh with the original gear 4h are journaled between the rotating plates 21a and 21b. The gears 22a and 22b are two-stage gears that share the same axis, and small-diameter pinion gears 22c and 22d are integrally formed. Furthermore, a large-diameter gear 22e is journaled between the pinion gears 22c and 22d, and this gear 22e is journaled rotatably on the guide shaft 4c of the input shaft 4.

[0044] Moreover, a square hole 22f for transmitting a rotational force to the square shaft 6c of the output shaft 6 is provided on the surface of the large gear 22e facing the output shaft 6. The number of teeth of the original gear 4h and the small gears 22c and 22d is, for example, 16, and the number of teeth of the large gears 22a, 22b, and 22e is 22.

[0045] When the operating part 2a of the grip 2 shown in Fig. 9 is not operated, the constant speed mode is set, and the connection switching member 12 moves rearward by the biasing force of the return coil spring 2e attached to the fixed cover member 11 and is connected to the rotation transmission member 13. The connection switching member 12 rotates following the rotation transmission member 13 which rotates together with the input shaft 4, and rotates the rotating plates 21a, 21b together with the cylindrical part 10d. When the rotating plates 21a, 21b rotate together with the input shaft 4, the gears in the spur gear group 20 do not rotate individually, and the rotation of the input shaft 4 is transmitted as it is to the square shaft 6c via the square hole 22f of the large gear 22e, and the rotation of the input shaft 4 is transmitted to the output shaft 6 in a one-to-one ratio.

[0046] On the other hand, as shown in Fig. 11, when the operating portion 2a of the grip 2 is operated against the biasing force of the return coil spring 2e, the deceleration mode is set. The connection switching member 12 is moved forward by the switching lever 2b and separated from the rotation transmission member 13. In this case, since the input shaft 4 and the cylindrical portion 10d can rotate separately, the rotation of the input shaft 4 is transmitted from the original gear 4h to the large gears 22a and 22b, which rotate the integral small gears 22c and 22d together and are transmitted to the large gear 22e. Furthermore, the rotation of the large gear 22e is transmitted to the output shaft 6 via the square shaft 6c fitted into the square hole 22f of the large gear 22e. The rotation speed of the output shaft 6 is (16 / 22)·(16 / 22)=0.53 from the gear ratio, and is gradually reduced to about half that of the input shaft 4.

[0047] In this way, also in the second embodiment, when the rotational load is large, the rotational speed of the output shaft is switched from the constant speed mode to the deceleration mode, thereby reducing the rotational load applied to the handle portion.

[0048] In this specification, the terms front, back, up, down, left and right are used for the purpose of explaining the drawings, and are not intended to restrict the shape, etc., of the article of the present invention. [Explanation of symbols]

[0049] 1 Casing 2 Grip 2a Control section 2b Switch lever 3 Switching mechanism section 4 Input Shaft 4a Sun gear 4h Original gear 5 Handle 6 Output shaft 6c square shaft 7 Post insertion hole 8a, 8b Parallel plates 9 Planetary gear retaining member 9b, 22f square hole 9d~9g Planetary gear set 10 Rotating member 10d Cylindrical part 10f Internal gear 11 Fixed cover member 12 Connection switching member 13 Rotation transmission member 20 spur gear group 21a, 21b Rotating plate 22a~22e Gears B Vinyl sheet P-post S winding shaft

Claims

1. A sheet opening / closing operation device in which the rotation of an input shaft rotated by a handle part is transmitted to an output shaft connected to a sheet winding shaft at a constant speed in a constant speed mode or at a reduced speed in a reduced speed mode by a speed change mechanism, an operation unit capable of switching between the constant speed mode and the deceleration mode; the speed change mechanism comprises an original gear integral with the input shaft, a group of speed change gears consisting of a plurality of gears arranged around the original gear, a speed change gear holding member that rotatably holds shaft portions of each gear of the group of speed change gears and into which the output shaft is fitted, and a connection switching member that switches the connection between the input shaft and the speed change gear holding member according to the constant speed mode or the deceleration mode by operating the operating portion, In the constant speed mode in which the output shaft and the input shaft rotate at the same speed, the input shaft and the speed change gear holding member are connected as one body by the connection switching member, and the rotation of the input shaft is transmitted to the output shaft via the speed change gear holding member, In the deceleration mode in which the rotation of the output shaft is reduced below the rotation of the input shaft, the input shaft and the transmission gear holding member are separated by the connection switching member, and the rotation of the original gear of the input shaft is decelerated and rotated by the group of transmission gears, transmitted to the transmission gear holding member, and transmitted to the output shaft via the transmission gear holding member.

2. 2. The seat opening / closing device according to claim 1, wherein the connection switching member is connected to and detached from a rotation transmission member that rotates integrally with the input shaft by operation of the operation portion.

3. 3. The seat opening / closing device according to claim 2, wherein the connection switching member moves along the input shaft to be connected to the rotation transmission member.

4. 4. The seat opening / closing device according to claim 3, wherein the operating portion is provided in a part of a casing, and the connection switching member is moved along the input shaft via a switching lever by operating the operating portion.

5. A seat opening and closing operation device as described in any one of claims 1 to 4, characterized in that the speed change mechanism is a planetary gear mechanism, the original gear is a sun gear, and the speed change gear holding member holds a group of planetary gears arranged around the sun gear.

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