JP4106652B2 - Brake device for roll screen - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roll screen brake device that reduces the winding speed of a screen, in particular, the winding speed near an ascent limit.
[0002]
[Prior art]
In a roll screen in which a spring is housed in a winding pipe rotatably supported by a side plate and the screen is wound around the winding pipe by the stored energy of the spring, the winding speed near the screen rising limit is set. A brake device for decelerating is known. For example, a brake device described in Japanese Patent Application Laid-Open No. 11-159265 is provided with a screw shaft fixedly supported by a side plate and a winding pipe that is axially movable with respect to a winding pipe and is relatively non-rotatable. A clutch case that moves on the screw shaft as the take-up pipe rotates, and a brake portion that is provided on the end side of the screw shaft. The clutch case engages with the brake portion from the final stage of screen winding to It is the structure which a part operates. With this configuration, the conventional brake device has a shape in which the clutch case is exposed to the outside. When the clutch device is installed in the take-up pipe, it is necessary to adjust the clutch case by engaging the take-up pipe.
[0003]
[Problems to be solved by the invention]
When the conventional brake device is installed in the winding pipe, the operation of adjusting the clutch case by engaging with the winding pipe is troublesome and requires time and effort.
[0004]
In addition, when the conventional brake device is traded as a single product, the clutch case exposed to the outside is easily damaged during transportation, and thus there is a problem that labor and cost required for packing and unpacking are large.
[0005]
The present invention has been made in order to solve these problems, and an object of the present invention is to provide a roll screen brake device that reduces the winding speed of the screen, in particular, the winding speed near the ascent limit. There is no exposed part, and it is not necessary to adjust the part by engaging it with the take-up pipe when it is installed in the take-up pipe. is there.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the means employed by the present invention is to accommodate a spring inside a winding pipe that is rotatably supported by the side plate, and wind the screen around the winding pipe by the stored energy of the spring. In a roll screen that reduces the winding speed of the screen by a brake device built in the winding pipe, a unit case that rotates integrally with the winding pipe and a case portion that fits in the unit case so as to rotate integrally. And a brake device that is disposed in the unit case and that brakes the shaft portion of the rotary damper.
[0007]
The brake clutch has a female screw provided on the inner peripheral surface of the unit case and a male screw that engages with the female screw on the outer peripheral surface, and a guide shaft that is fixedly supported by the side plate and a relative rotation of the guide shaft that is impossible. There is a slide piece that can be slid in the axial direction, a rotary piece that is fitted to the guide shaft so as to be capable of relative rotation and is connected to the shaft portion of the rotary damper, and a slide piece and a rotary piece. The slide piece, which is formed from a protrusion that engages when both approach, and slides without rotating, decelerates the rotary damper by braking the rotation of the shaft part of the rotary damper together with the rotary piece near the upper limit of the screen. Activate the action.
[0008]
By this means, the brake device is extremely easy because all parts are housed inside the unit case, and the interior work on the winding pipe is simply inserted into the winding pipe as it is. When this brake device is traded as a single product, all parts are housed in a cylindrical unit case and there are no parts exposed to the outside, so the labor and cost required for packing and unpacking are greatly reduced. To do.
[0009]
The brake device of the present invention can be integrated with the operation clutch. In this case, it is preferable that the unit case is integrally connected to the rotating case of the operation clutch, and the guide shaft is integrally connected to the fixed shaft of the operation clutch. Furthermore, the unit case accommodates a slide piece inside, a slide piece case having a coupling for connecting to the rotating case of the operation clutch on one end side, a rotary piece and a rotary damper inside, and one end side It is preferable to form it from a rotary piece case having a coupling tool for connection to the slide piece case to facilitate assembly.
[0010]
When this brake device is traded as a single product, all parts are housed in a cylindrical unit case and there are no parts exposed to the outside, so the labor and cost required for packing and unpacking are greatly reduced. To do.
[0011]
In order to prevent the brake device from operating when the screen starts to descend, the rotary piece can be rotated relative to the guide shaft, but cannot be slid in the axial direction. It is preferable to form a cam body that is externally fitted so as to be capable of relative rotation and axial sliding, and a spring body that elastically presses the cam body and the cam groove body apart from each other in the axial direction. The cam groove body is connected to the shaft portion of the rotary damper so as to rotate integrally, the protrusion that engages with the slide piece is provided on the cam body, and the helical cam groove is formed on the outer peripheral surface of the cam groove body. Cam pins that engage with the cam groove are provided on the surface. When the screen is raised, the cam pin moves to one end of the cam groove to push the cam body toward the slide piece. When the screen is lowered, the cam pin is the other end of the cam groove. And move the cam body back from the slide piece side.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The brake device of the present invention will be described based on an embodiment shown in the drawings.
FIG. 1 is a longitudinal sectional view of a roll screen provided with an embodiment, and FIGS. 2 and 3 are longitudinal sectional views of the embodiment, showing a screen rising limit and a state when the screen is lowered, respectively. 4 is a front view of the unit case, FIG. 5 is a right side view of the slide piece, FIG. 6 is a left side view of the rotary piece, FIG. 7 is a right side view of the rotary piece, and FIG. 8 is a front view of the cam groove body. FIG. 9 is a development view of the cam groove.
[0013]
As shown in FIG. 1, the roll screen 1 includes a winding pipe 3 around which the screen 2 is wound. The winding pipe 3 is attached to side plates 5 provided on the left and right sides of a set frame 4 fixed to a window frame or the like. It is supported rotatably. On one end side of the roll screen 1 is a second brake device 20 that further decelerates the ascent speed of the screen 2 near the ascent limit, and on the other end side is a first brake device 11 that always decelerates the ascent speed of the screen 2. Each is decorated.
[0014]
An initial winding adjustment device 6 is provided on the side plate 5 on the other end side, and a fixed shaft 7 is directly connected to an output shaft of the initial winding adjustment device 6. A spring 8 is loosely fitted to the fixed shaft 7 to rotate the take-up pipe 3 by a stored energy and wind the screen 2 around the take-up pipe 3. One end of the spring 8 is loosely fitted to the fixed shaft 7 and locked to a moving wheel 10 that rotates integrally with the winding pipe 3, and the other end is locked to a fixed wheel 9 fixed to the fixed shaft 7.
[0015]
The first brake device 11 includes a first rotary damper 12, and its shaft portion 13 is directly connected to the left end portion of the fixed shaft 8 via a first braking clutch 15. The case 14 of the first rotary damper 12 rotates integrally with the driving wheel 10, that is, the winding pipe 3. When the winding pipe 3 rotates in the winding direction of the screen 2, the braking clutch 15 operates and stops the rotation of the shaft portion 13, but when the winding pipe 3 rotates in the drawing direction of the screen 2, the braking clutch 15 does not operate. The shaft portion 13 rotates together with the case 14. As described above, the first rotary damper 11 generates a rotational resistance inside the screen ascending, and always activates a deceleration action. However, when the screen is lowered, no effective rotational resistance is generated inside the first rotary damper 11. Does not activate.
[0016]
The second brake device 20 includes a second rotary damper 22 and a second brake clutch 25 that brakes the shaft portion 23 of the second rotary damper, and an operation clutch 16 provided at one end of the winding pipe 3. Arranged integrally. The operation clutch 16 is well-known, and when the screen 2 is pulled down and released to some extent, the winding rotation of the winding pipe 3 by the spring 8 is stopped, but when the screen 2 is pulled down slightly and released, the winding by the spring 8 is stopped. The winding rotation of the pipe 3 is allowed. The rotating case 17 of the operation clutch 16 rotates integrally with the winding pipe 3, and the fixed shaft 18 is fixedly supported on the side plate 5.
[0017]
The second braking clutch 25 includes a unit case 21, a guide shaft 26, a slide piece 29, and a rotary piece 30. The unit case 21 is integrally connected at one end via the rotating case 17 of the operation clutch 16 and the coupling members 35a and 35b, and rotates integrally with the winding pipe 3. The case 24 of the second rotary damper 22 is fitted into the other end of the unit case 21 and rotates integrally with the winding pipe 3. The guide shaft 26 is directly connected to the fixed shaft 18 of the operation clutch 16 and extends in the unit case 21.
[0018]
The unit case 21 includes a female screw 27 on the inner peripheral surface. A slide piece 29 having a male screw on its outer periphery that engages with the female screw 28 is fitted on the guide shaft 26 so as not to rotate but to be slidable in the axial direction. A rotary piece 30 is rotatably fitted to the right end portion of the guide shaft 26, and the rotary piece 30 is coupled to rotate integrally with the shaft portion 23 of the second rotary damper 22. The slide piece 29 and the rotary piece 30 have protrusions 31 and 32 which are engaged with each other when they are close to each other on the opposite end surfaces.
[0019]
While the screen 2 is raised and lowered, the case 24 of the second rotary damper 22 always rotates integrally with the winding pipe 3. At this time, if the projections 31 and 32 of the slide piece 29 and the rotary piece 30 are separated, the shaft portion 23 rotates together with the case 24, and no effective rotational resistance is generated inside the second rotary damper 22. The two brake devices 20 do not activate a deceleration action. However, if the projections 31 and 32 of the slide piece 29 and the rotary piece 30 are coupled, the shaft portion 23 stops rotating and an effective rotational resistance is generated inside the second rotary damper 22, so that the second brake The device 20 activates a deceleration action.
[0020]
As shown in FIG. 2, when the winding pipe 3 rotates in the screen raising direction, the slide piece 29 moves on the guide shaft 26 in the arrow A direction. When the screen rise limit is approached, the slide piece 29 approaches the rotary piece 30 and the both protrusions 31 and 32 engage with each other, so that the second brake device 20 activates a deceleration action.
[0021]
As shown in FIG. 3, when the winding pipe 3 rotates in the screen lowering direction, the slide piece 29 moves on the guide shaft 26 in the direction of arrow B, and the slide piece 29 moves away from the rotary piece 30 and both protrusions 31 and 32. Are separated, the second brake device 20 does not exhibit a deceleration action.
[0022]
As shown in FIGS. 1 and 4, the unit case 21 accommodates a slide piece 29 inside for easy assembly, and a connecting member 35 for directly connecting to the rotating case 17 of the operation clutch 16 on one end side. And a rotary piece case 34 which accommodates the rotary piece 30 and the second rotary damper 22 inside and has a connecting member 35 for directly connecting to the slide piece case 33 on one end side. The unit case 21 and the rotating case 17 have the same outer diameter.
[0023]
The rotating case 17 is rotatably supported by the side plate cap 19, and the distal end portion of the deformed section of the guide shaft 26 is fixedly connected by being fitted into the same deformed section recess of the other end portion of the fixed shaft 18. Next, the slide piece case 33 is integrally connected to the other end portion of the rotation case 17 via the coupling tool 35. At the same time, the slide piece 29 held at a predetermined position inside is externally fitted to the guide shaft 26. Then, the rotary piece case 34 is integrally connected to the other end portion of the slide piece case 33 via the couplers 35a and 35b. At the same time, the rotary piece 30 held inside is fitted on the guide shaft 26. Next, the case 24 of the second rotary damper 22 is mounted and fixed in the rotary piece case 34, and the distal end portion of the deformed cross section of the shaft portion 23 is fitted into the same deformed cross section recess at the other end of the rotary piece 30 to be fixed. Connect to.
[0024]
In the second brake device 20 assembled in this way, the setting members at the time of assembly such as the slide piece 29 and the rotary piece 30 are not exposed to the outside at all. . Further, since the second brake device 20 can be installed in the roll screen 1 simply by being inserted from the end face of the winding pipe 3 as it is, labor and time required for the interior work are greatly reduced. When the brake device 20 is traded as a single product, all the parts are accommodated in the cylindrical unit case 21 and there are no parts exposed to the outside. Therefore, the cost and labor required for packing and unpacking are small.
[0025]
As shown in FIGS. 3 and 5, the slide piece 29 includes a main body 36 through which the guide shaft 26 penetrates, a screw portion 37 in which a male screw is formed, and a spring brake 38 interposed therebetween. The spring brake 38 prevents relative rotation of the screw portion 37 with respect to the main body 36 until the screw portion 37 contacts the stopper of the axial sliding limit. Allow rotation.
[0026]
The cross section of the guide shaft 26 is K-shaped, and the cross section of the guide shaft hole 39 of the main body 36 through which the guide shaft 26 passes is H-shaped, so that the slide piece 29 slides smoothly in the axial direction. A protrusion 31 protrudes from the lower part of the other end face of the slide piece 29 with respect to the rotary piece 30.
[0027]
As shown in FIGS. 3, 6, and 7, the rotary piece 30 includes a cap-shaped cam body 40, a cam groove body 41 that externally fits the cam body so as to be slidable and rotatable, and the cam body 40. The cam groove body 41 includes a spring 42 that elastically presses and separates the cam groove body 41 in the axial direction.
[0028]
The cam groove body 41 can rotate with respect to the guide shaft 26 and the unit case 21, but cannot slide in the axial direction. The cam groove body 41 has a shaft hole 43 into which the shaft portion 23 of the second rotary damper 22 is integrally fitted. Three protrusions 32 protrude from the one end face of the cam body 40 with respect to the slide piece 29. The radial position of each protrusion 32 is the same as the protrusion 31 of the slide piece 29. Three cam pins 44 project radially from the inner peripheral surface of the cam body 40 at an equal central angle and engage with the cam groove 45 of the cam groove body 41.
[0029]
As shown in FIGS. 2, 8, and 9, three cam grooves 45 are formed on the outer peripheral surface of the cam groove body 41. Each cam groove 45 has a letter shape, and the cam pin 44 slides on the slope portion of the cam groove 45.
[0030]
When the screen is rolled up, the spring 42 pushes the cam body 40 toward the slide piece and moves the cam pin 44 to the one end 46 of the cam groove 45. Since the one end portion 46 of the cam groove 45 is not a slope but a surface perpendicular to the axis, the cam body 40 is not pushed back by the abutting slide piece 29 near the screen ascent limit. As a result, both protrusions 31 and 32 are coupled, and the slide piece 29 stops the rotation of the shaft portion 23 of the second rotary damper 22 together with the rotary piece 30.
[0031]
When the screen is pulled down, the cam groove body 41 rotating in the same direction as the take-up pipe immediately moves the cam pin 44 from one end portion 46 to the other end portion 47 of the cam groove 45 and pulls the cam body 40 back from the slide piece 29. Both protrusions 31 and 32 are separated. As a result, the shaft portion 23 of the second rotary damper 22 rotates together with the rotary piece 30 in the same direction as the take-up pipe, and the second brake device 20 does not activate the deceleration action.
[0032]
【The invention's effect】
As described above, since the conventional brake device is adjusted by engaging the clutch case with the take-up pipe when it is mounted on the roll screen, it takes time and effort for the mounting work. There are no parts that need to be adjusted by engaging with the take-up pipe when the screen is installed. All parts can be housed inside the unit case and can be attached to the roll screen simply by inserting the unit case into the take-up pipe. Therefore, it has an excellent effect that the mounting work is extremely easy. In addition, when the brake device of the present invention is traded as a single product, all parts are accommodated in a cylindrical unit case, and there are no parts exposed to the outside. Has the special effect of significantly reducing the power consumption.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a roll screen provided with an embodiment of the present invention,
FIG. 2 is a longitudinal sectional view of an embodiment showing a state when the screen is raised,
FIG. 3 is a longitudinal sectional view of an embodiment showing a state when the screen is lowered,
FIG. 4 is a front view of a unit case,
FIG. 5 is a right side view of the slide piece,
FIG. 6 is a left side view of the rotary piece,
FIG. 7 is a right side view of the rotary piece.
FIG. 8 is a front view of the cam groove,
FIG. 9 is a development view of a cam groove.
[Explanation of symbols]
1: Roll screen 2: Screen 3: Winding pipe 4: Set frame 5: Side plate 6: Initial winding adjusting device 7: Fixed shaft 8: Spring 9: Fixed wheel 10: Driving wheel 11: First brake device 12: First Rotary damper 13: Shaft portion 14: Case 15: First braking clutch 16: Operation clutch 17: Rotating case 18: Fixed shaft 19: Side plate cap 20: Second brake device 21: Unit case 22: Second rotary damper 23: Shaft portion 24: Case 25: Second brake clutch 26: Guide shaft 27: Female screw 28: Male screw 29: Slide piece 30: Rotary piece 31, 32: Projection 33: Slide piece case 34: Rotary piece case 35a, 35b: Connecting tool 36: body 37: screw portion 38: spring brake 39: guide shaft hole 40: cam body 41: cam groove body 42: spring 43 Shaft hole 44: cam pin 45: cam groove 46: end 47: the other end

Claims (5)

A spring (8) is housed inside a winding pipe (3) rotatably supported by the side plate (5), and the screen (2) is wound around the winding pipe by the stored energy of the spring, In the roll screen (1) in which the screen winding speed is reduced by a brake device (20) built in the winding pipe, the brake device includes a unit case (21) that rotates integrally with the winding pipe, A rotary damper (22) fitted into the unit case so that the case part (24) rotates integrally, and a braking clutch (25) disposed in the unit case and braking the shaft part (23) of the rotary damper. The brake clutch is provided on a guide shaft (26) fixedly supported by the side plate and an inner peripheral surface of the unit case. And a slide piece (29) that is provided on the outer peripheral surface with a female screw (27) that engages with the female screw, and is externally fitted to the guide shaft so that relative rotation is impossible but axial sliding is possible. The rotary piece (30), which is fitted to the guide shaft so as to be relatively rotatable and connected to the rotary damper shaft portion so as to rotate integrally therewith, is provided on both the slide piece and the rotary piece, and when both are approaching The slide piece, which is formed of engaging protrusions (31, 32) and slides without rotating, near the upper limit of the screen, brakes the rotation of the rotary damper shaft portion together with the rotary piece to A brake device for a roll screen, which activates a deceleration action. The unit case (21) is integrally connected to the rotating case (17) of the operation clutch (16), and the guide shaft (26) is integrally connected to the fixed shaft (18) of the operation clutch. The brake device for roll screens as described. The unit case (21) includes a slide piece case (33) for accommodating the slide piece (29) therein, and a rotary piece case (34) for accommodating the rotary piece (30) and the rotary damper (22) therein. The slide piece case is connected to a clutch case (17) of an operation clutch (16), and the rotary piece case is connected to the slide piece case via a coupling tool (35a, 35b), respectively. The brake device for roll screens as described. The rotary piece (30) can be rotated relative to the guide shaft (26) but cannot be slid in the axial direction, and the cam groove (41) is relatively rotated and slid in the axial direction. A cam body (40) that fits externally and a spring body (42) that elastically presses the cam body and the cam groove body apart from each other in the axial direction, and the cam groove body of the rotary damper (22). The cam body is provided with a protrusion (32) that is connected to the shaft portion (23) and rotates integrally with the slide piece (29), and a helical cam groove (45) is formed on the outer peripheral surface of the cam groove body. A cam pin (44) that engages with the cam groove is planted on the inner peripheral surface of the cam body. When the screen is raised, the cam pin moves to one end (46) of the cam groove to Push the cam body toward the slide piece, and when the screen is lowered, There rolling screen brake device according to any one of claims 1 to 3, characterized in that pull back the cam member moves to the other end (47) of the cam groove from the slide piece side. The roll screen brake device according to claim 4, wherein the one end (46) of the cam groove (45) is perpendicular to the axis.

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