JP7718976B2 - Winding shaft mounting structure for electric shutter device - Google Patents

Description

This invention relates to a winding shaft mounting structure for an electric shutter device, in which a winding shaft having a shaft at one end and a motor case at the other end is mounted between the inner surfaces of two side plates via brackets.

An electric shutter device in which the shutter curtain is operated by driving an electric motor includes an electric motor built into one end of the winding shaft around which the shutter curtain is wound (see, for example, Patent Document 1).

JP 2012-52388 A

In the electric shutter device equipped with the above-mentioned winding shaft, a dedicated bracket is attached to the inner surface of the side plate, and the winding shaft is attached between the inner surfaces of the side plates by fixing the shaft and motor case to each bracket. However, attaching via a dedicated bracket increases the number of parts to be handled, which is not necessarily desirable in terms of manufacturing costs.

In light of the above situation, the present invention aims to provide a winding shaft mounting structure for an electric shutter device that can reduce manufacturing costs.

In order to achieve the above-mentioned object, the winding shaft mounting structure of an electric shutter device of the present invention is a winding shaft mounting structure of an electric shutter device in which a winding shaft having a shaft at one end and a motor case at the other end is mounted between the inner surfaces of two side plates via brackets, and the end of the motor case is provided with a fitting portion that can fit into a bracket for supporting the shaft, and the bracket supporting the shaft has a support wall portion and two side wall portions provided on both sides of the support wall portion, and is attached to the side plate with the support wall portion and the two side wall portions protruding from the inner surface, and the end of the shaft is detachably supported between the support wall portion and the two side wall portions, and the fitting portion of the motor case has two opposing abutment surfaces that abut against the outer surfaces of the two side wall portions, and forms a recess into which the bracket is fitted between the two abutment surfaces, and the fitting portion has one end that opens to the circumferential surface of the motor case, while the other end is closed .

According to the present invention, a common bracket can be used for both the shaft and the motor case, which eliminates the need for an increased number of parts and provides advantages in terms of manufacturing costs. Furthermore, because the fitting portion of the motor case and the bracket fit together, the take-up shaft and side plate can be attached more firmly, which is advantageous in terms of durability.

1 is a vertical cross-sectional view of an electric shutter device to which a winding shaft mounting structure according to an embodiment of the present invention is applied. FIG. 2 is an exploded perspective view of the electric shutter device shown in FIG. 1 as seen from the outside of the room. 2 shows the components of the electric shutter device shown in FIG. 1, where (a) is a perspective view of the shutter case, (b) is a perspective view showing one of the side plates that make up the shutter case, and (c) is a perspective view showing the other side plate that makes up the shutter case. 2A and 2B show the components of the electric shutter device shown in FIG. 1, in which FIG. 2A is a perspective view of the winding shaft with the winding roll disposed around it, and FIG. 2B is an enlarged perspective view of the main part of the motor case which is one end of the winding shaft. 2 is a plan view of a main part showing a connecting portion between a side plate and a shaft of a winding shaft in the electric shutter device shown in FIG. 1 . 2 is an enlarged view showing an end face of a motor case in a winding shaft applied to the electric shutter device shown in FIG. 1 . This shows the connection between the side panel and the motor case of the winding shaft in the electric shutter device shown in Figure 1, where (a) is a perspective view of the main part as seen from outside the room with the slat guide omitted, and (b) is a perspective view of the main part as seen from the building side with the slat guide omitted. 2 is a perspective view of a connection portion between a side plate and a motor case of a winding shaft in the electric shutter device shown in FIG. 1, as viewed from the outside of the room. FIG. 2 is a view of a side plate to which a motor case of a winding shaft is connected in the electric shutter device shown in FIG. 1, as viewed from the inner surface side. FIG.

A preferred embodiment of the winding shaft mounting structure for an electric shutter device according to the present invention will be described in detail below with reference to the accompanying drawings. Note that, for convenience, the terms "prospect direction" and "finding direction" will sometimes be used below. The prospect direction is the direction along the depth of the electric shutter device, as indicated by arrow A in the drawings. A surface along the prospect direction will sometimes be referred to as a "prospect surface." The prospect direction is the direction perpendicular to the prospect direction for items that extend horizontally, such as horizontal frames. For items that extend vertically, such as vertical frames, the horizontal direction perpendicular to the prospect direction is called the "prospect direction." A surface along the prospect direction will sometimes be called a "finding surface."

Figures 1 and 2 show an electric shutter device that employs a winding shaft mounting structure that is an embodiment of the present invention. The electric shutter device illustrated here is intended to be attached to the upper part of the frame 10 of a fixture such as a sliding window. The frame 10 of the fixture to which the electric shutter device is attached has a shutter box 20 configured above the upper frame 11. The shutter box 20 is used to house and support the electric shutter device, and is configured in the shape of a horizontally elongated rectangular parallelepiped by extending the upper ends of the left and right vertical frames 12 above the upper frame 11 and installing a roof plate 21 between the upper ends of the extended vertical frames 12.

The electric shutter device installed in the shutter box 20 described above winds and unwinds a shutter curtain 32 around a winding shaft 31 provided in the shutter case 30. As shown in Figures 1 to 3, the shutter case 30 is configured with side panels 34 facing each other on both sides of a back panel 33. The upper and outdoor portions of the shutter case 30 between the left and right side panels 34 are removably covered by a front cover 35a. Brackets 36 for supporting the winding shaft 31 are attached to opposing portions of the side panels 34. The winding shaft 31 houses an electric motor 37 and its control unit 38 and rotatably supports a winding roll 39 on its outer periphery, allowing the winding roll 39 to rotate in both directions relative to the electric motor 37. The control unit 38 controls the direction and speed of rotation of the electric motor 37 based on commands received from a remote control or indoor terminal device (not shown), which will be described later.

In this embodiment, as shown in FIG. 4, a winding shaft 31 is used, in which a cylindrical shaft 31a protrudes from one end of a winding roll 39 and a columnar resin motor case 31b protrudes from the other end. The shaft 31a and motor case 31b are connected to brackets 36, respectively, thereby attaching the winding shaft 31 between the left and right side plates 34. More specifically, the brackets 36 are originally intended to support the shaft 31a, and as shown in FIGS. 3(b) and 3(c), each bracket 36 is configured with a support wall 36a, two side walls 36b on either side of the support wall 36a, and a mounting wall 36c bent from each side wall 36b. The brackets 36 are attached to the approximate center of the inner surface 34a of the side plates 34 via the mounting wall 36c, with the support opening 36d between the side walls 36b opening obliquely upward toward the outside. The bracket 36 can be attached to the side plate 34 by spot welding or by screws. The distance between the two side wall portions 36b is dimensioned to accommodate the shaft 31a of the take-up spindle 31. As shown in FIG. 5, the shaft 31a of the take-up spindle 31 is positioned between the support wall portion 36a and the two side wall portions 36b, and the connecting member 36e is inserted through the screw insertion hole (screw insertion portion) 36b1 of the side wall portion 36b and the screw insertion hole 31a1 of the shaft 31a. The connecting member 36e can be, for example, a screw inserted and threaded onto a nut.

On the other hand, as shown in Figure 4(b), the motor case 31b of the winding shaft 31 is provided with a mating portion 40 that opens onto the end face and circumferential surface. The mating portion 40 is concave and includes two opposing abutment surfaces 41 spaced apart by approximately the same distance as the width of the two side wall portions 36b of the bracket 36, a closed end surface 42 that connects one end of each abutment surface 41, and two open edge surfaces 43 that extend away from the other end edges of each abutment surface 41. As shown in Figure 6, a recess 44 is provided at each of the meeting points, which form the inside corners between the abutment surfaces 41 and the closed end surface 42. The recess 44 is formed to have a concave shape and prevents direct contact between the abutment surface 41 and the closed end surface 42. As shown in Figures 6 and 7, the motor case 31b having this fitting portion 40 can be fitted to the bracket 36 with the side wall portion 36b of the bracket 36 abutting against the two abutment surfaces 41, respectively, and with the end face of the side wall portion 36b abutting against the closed end face 42. Furthermore, by passing a connecting member 36f through the screw insertion hole (screw insertion portion) 31b1 of the motor case 31b and the screw insertion hole 36b1 of the side wall portion 36b, the motor case 31b can be detachably attached to the bracket 36. As with the previous example, the connecting member 36f can be a screw passed through and a nut threaded onto it.

In addition, cable insertion holes 51 and wire insertion holes 52 are provided on the end faces of the motor case 31b. As shown in FIG. 9, the cable insertion holes 51 are provided in multiple locations around the periphery of the motor case 31b, and are intended to allow cables such as a power cable 61 and its connector 61a for supplying power to the electric motor 37 and control unit 38 built into the winding shaft 31, and a terminal communication cable 62 for connecting external devices such as indoor terminal equipment to the control unit 38 to pass through the motor case 31b. The wire insertion hole 52 is the only one provided in the approximate center of the motor case 31b, and is intended to allow an operating wire 63 to pass through the motor case 31b. The operating wire 63 is pulled to release the braked state of the winding roll 39 relative to the winding shaft 31 and manually operate the shutter curtain 32.

As shown in FIG. 1, the shutter curtain 32 is constructed by interconnecting multiple slats 32a, with one end connected to the winding roll 39. When the winding roll 39 rotates relative to the winding shaft 31 by driving the electric motor 37, the shutter curtain 32 can be wound and unwound around the winding roll 39. As shown in FIGS. 1 and 2, guide rails 13 are provided on the left and right vertical frames 12 on the exterior side of the room. When the shutter curtain 32 is unwound from the winding roll 39, both edges are inserted into the guide rails 13, allowing it to close the opening of the frame body 10. As shown in FIG. 1, a winding space 32A is provided between the outer periphery of the winding roll 39 and the back panel 33 and front cover 35a so that the shutter curtain 32 does not come into contact with the back panel 33 and front cover 35a even when the shutter curtain 32 is fully wound onto the winding roll 39. Furthermore, a larger gap is maintained between the side plates 34 of the shutter case 30 than between the shutter curtains 32, so the shutter curtain 32 wound around the winding roll 39 does not come into contact with the inner surface 34a of the side plates 34. Note that reference numeral 35b in Figure 2 denotes a side cover that covers the outer surface of the portion of the side plate 34 that protrudes outside the room beyond the vertical frame 12.

As shown in FIG. 8, one side plate 34 (the right side plate when viewed from the outside) supporting the motor case 31b has three slat guides 70A, 70B, and 70C arranged side by side in the circumferential direction around the winding shaft 31 on the inner surface 34a facing the other side plate 34. These slat guides 70A, 70B, and 70C are disposed in the gap between the shutter curtain 32 and the side plate 34, thereby forming a storage space (not shown) between the side plate 34 and the shutter curtain 32. As shown in FIG. 9, these storage spaces accommodate the power cable 61, its connector 61a, and terminal communication cable 62, which are pulled out from the cable insertion hole 51 of the motor case 31b to the outside, as well as the middle portion of the operating wire 63 mentioned above. Furthermore, the outside slat guide 70B accommodates electronic components 64, such as communication devices, for connecting the control unit 38 to external devices such as remote controls and indoor terminal equipment.

When the electric shutter device configured as described above is operated from inside the building via a remote control or indoor terminal device (not shown), the electric motor 37 rotates in a direction and at a speed corresponding to the operation via the electronic components 64 and control unit 38. This causes the shutter curtain 32 to be wound and unwound around the winding roll 39 of the winding shaft 31, opening and closing the opening in the frame 10 as appropriate. During these operations, the shutter curtain 32 moves inside the shutter case 30. However, the power cable 61, terminal communication cable 62, operating wire 63, and electronic components 64 are all located in the storage space between the slat guides 70A, 70B, and 70C and the side panel 34. Therefore, there is no risk of the shutter curtain 32 coming into contact with these cables 61 and 62, operating wire 63, or electronic components 64.

Furthermore, because a common bracket 36 can be used for both the shaft 31a of the winding shaft 31 and the motor case 31b, the number of parts is not increased, which is advantageous in terms of manufacturing costs. Moreover, because the mating portion 40 of the motor case 31b is mated with the bracket 36, the winding shaft 31 and the side plate 34 can be more firmly attached, which is also advantageous in terms of durability. Furthermore, the mating portion 40 has a relief portion 44 at the meeting point where the abutment surface 41 and the closed end surface 42 meet, forming an internal corner. Therefore, although the side wall portion 36b of the bracket 36 is pressed against the abutment surface 41 as the winding shaft 31 and the winding roll 39 rotate relative to each other, stress is prevented from concentrating at the meeting point between the abutment surface 41 and the closed end surface 42. This eliminates the risk of damage to the motor case 31b, even when the electric shutter device is used for an extended period of time.

In the above-described embodiment, a recessed fitting portion 40 is exemplified, but this is not necessarily limited to this. For example, a fitting portion 40 that fits between the side wall portions 36b of the bracket 36 may be provided on the motor case 31b. Furthermore, screw insertion holes 31b1, 36b1 are exemplified as screw insertion portions through which the connecting member 36f passes, but grooves that allow screws to be inserted may also be used.

As described above, the winding shaft mounting structure for an electric shutter device of the present invention is a winding shaft mounting structure for an electric shutter device in which a winding shaft having a shaft at one end and a motor case at the other end is mounted between the inner surfaces of two side plates via brackets, and is characterized in that the end of the motor case is provided with a fitting portion that can be fitted into a bracket for supporting the shaft.
According to this invention, a common bracket can be used for both the shaft and the motor case, which does not increase the number of parts and is advantageous in terms of manufacturing costs. Moreover, since the fitting portion of the motor case and the bracket are fitted together, the take-up shaft and the side plate can be attached more firmly, which is advantageous in terms of durability.

The present invention is also characterized in that, in the winding shaft mounting structure of the electric shutter device described above, the bracket supporting the shaft has a support wall and two side wall portions provided on both sides of the support wall, and is attached to the side plate with the support wall and the two side wall portions protruding from the inner surface, and the end of the shaft is detachably supported between the support wall and the two side wall portions, and the fitting portion of the motor case has two opposing abutment surfaces that abut against the outer surfaces of the two side wall portions, and forms a recess into which the bracket is fitted between the two abutment surfaces, one end of the fitting portion opens to the circumferential surface of the motor case while the other end is closed, and the meeting portion between the closed end surface of the fitting portion and the abutment surface each has a recess so as to be concave.
According to this invention, the motor case and the bracket are joined via the two side walls of the bracket, which ensures a large joining area between them, which is advantageous in terms of strength. Moreover, the motor case is provided with relief portions at both corners of the closed end face, which prevents damage to the motor case due to stress concentration.

The present invention is also characterized in that, in the winding shaft mounting structure of the above-mentioned electric shutter device, the motor case and the bracket are each provided with a screw insertion portion, and the motor case is attached to the bracket by passing a connecting member through the screw insertion portion of the motor case and the screw insertion portion of the bracket.
According to this invention, the motor case can be attached to the bracket by passing a connecting member such as a screw through the screw insertion portion, which is advantageous in terms of workability.

31: Winding shaft, 31a: Shaft, 31b: Motor case, 31b1: Screw insertion hole, 34: Side plate, 34a: Inner surface, 36: Bracket, 36a: Support wall portion, 36b: Side wall portion, 36b1: Screw insertion hole, 36c: Mounting wall portion, 36d: Support opening, 36e, 36f: Connecting pin, 40: Fitting portion, 41: Abutment surface, 42: Closed end surface, 43: Opening edge surface, 44: Recess portion

Claims (3)

A winding shaft mounting structure for an electric shutter device, in which a winding shaft having a shaft at one end and a motor case at the other end is mounted between the inner surfaces of two side plates via brackets,
an end of the motor case is provided with a fitting portion that can be fitted onto a bracket that supports the shaft ;
the bracket supporting the shaft has a support wall portion and two side wall portions provided on both sides of the support wall portion, and is attached to the side plate with the support wall portion and the two side wall portions protruding from an inner surface, and detachably supports the end of the shaft between the support wall portion and the two side wall portions;
the fitting portion of the motor case has two opposing abutment surfaces that abut on outer surfaces of the two side wall portions, and forms a recess between the two abutment surfaces into which the bracket is fitted,
The winding shaft mounting structure for an electric shutter device is characterized in that one end of the fitting portion is open to the peripheral surface of the motor case, while the other end is closed . 2. The winding shaft mounting structure for an electric shutter device according to claim 1, wherein a recess is provided at the meeting point between the closed end surface of the fitting portion and the abutting surface so as to be concave. The motor case and the bracket each have a screw insertion portion,
2. The winding shaft mounting structure of an electric shutter device according to claim 1, wherein the motor case is attached to the bracket by passing a connecting member through the screw insertion portion of the motor case and the screw insertion portion of the bracket.