Lighting equipment rotation mechanism

Abstract

To provide a lighting equipment rotation mechanism capable of rotating a lighting fixture in a fixed range of 360 degrees or more without an electric cord being excessively twisted.SOLUTION: A lighting equipment rotation mechanism includes: a support shaft, which is a cylindrical shaft into which an electric cord of a lighting fixture is inserted, and in which a tip side shaft part is connected to a base end side shaft part rotatably at less than 360° around the axis line, and the base end side shaft part is formed with a plane part parallel to an axis direction on an outer peripheral surface; a support plate member provided with a circular insertion hole, which supports the entire support shaft rotatably around the axis line and is fixed to an engagement groove of a case; a stopper member which is provided with a non-circular insertion hole formed with a linear inner edge part, and co-rotates together with the entire support shaft by matching the plane part of the base end side shaft part of the support shaft with the inner edge part, and which is formed with a convex piece on the outer peripheral surface in a protruding manner, and inhibits the entire support shaft from rotating at 360° or more when the convex piece hits a protrusion formed on a groove forming wall of the engagement groove of the case; and a nut member for holding the support plate member and the stopper member at the base end side shaft part.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a lighting fixture rotation mechanism. [Background technology]

[0002] Conventionally, there is known a lighting device in which a lamp is rotatably supported in a case provided with a terminal for an electric cord. In order to prevent the electric cord from being twisted and broken, such lighting devices are configured to limit the rotation range of the lamp to less than 360 degrees. For example, Patent Document 1 discloses a lighting device in which the rotation of a support shaft on which the lamp is attached is restricted to a range of 180 degrees around the axis. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-97931 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, such lighting fixtures may result in some areas being unable to be illuminated, and if the lighting fixture were allowed to rotate without limit, the electric cord would be twisted excessively, causing it to break.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a lighting fixture rotation mechanism that enables the lighting fixture to be rotated within a certain range of 360 degrees or more without excessively twisting the electrical cord. [Means for solving the problem]

[0006] The lighting fixture rotation mechanism according to the present invention comprises: a support shaft which is a cylindrical shaft through which an electric cord of a lighting fixture is inserted, the support shaft being connected to a tip end shaft portion to which the lighting fixture is attached and a base end shaft portion supported by a case, the tip end shaft portion being connected to the base end shaft portion so as to be rotatable around an axis by less than 360°, and the base end shaft portion being provided with a flat surface on its outer periphery which is parallel to the axial direction; a support plate member having a circular insertion hole, the support plate member being fixed to a fitting groove of the case by inserting a base end side shaft portion of the support shaft into the circular insertion hole to support the entire support shaft rotatably about its axis; a stopper member having a non-circular insertion hole, a linear inner edge portion formed in the non-circular insertion hole, a flat portion of a base end shaft portion of the spindle being aligned with the inner edge portion so that the base end shaft portion is inserted into the non-circular insertion hole and rotates together with the entire spindle, and a protruding piece is formed on the outer periphery, the protruding piece coming into contact with a protrusion formed on a groove forming wall of the fitting groove of the case to prevent the entire spindle from rotating more than 360 degrees; The support plate member and the stopper member are threadedly engaged with a base end shaft portion of the support shaft through which the support plate member and the stopper member are inserted, and a nut member is provided to hold the support plate member and the stopper member on the base end shaft portion. Effect of the Invention

[0007] According to the lighting device rotation mechanism of the present invention, the entire shaft is allowed to rotate freely around its axis by the support plate member, while the stopper member prevents the shaft from rotating more than 360 degrees. The shaft itself is allowed to rotate less than 360 degrees around its axis with respect to the base shaft. Therefore, the lighting device can rotate not only the shaft at the tip end of the shaft itself, but also an additional predetermined angle range until the entire shaft is prevented from rotating by the stopper member, and as a result, the lighting device can rotate within a range of 360 degrees or more and less than 720 degrees. Therefore, the lighting device can illuminate any location within a 360-degree range, improving usability. In addition, the lighting device cannot be rotated more than 720 degrees (two or more rotations) in one direction, which prevents the electric cord from being excessively twisted two or more times and breaking. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a side view showing the lighting fixture attached to the duct rail. [Diagram 2] FIG. 2 is a side view showing the lighting fixture with the case disassembled. [Diagram 3] 1A and 1B are a side view and a plan view showing components of a lighting fixture rotation mechanism according to an embodiment. [Figure 4] FIG. 1 shows the tip and base end shafts of the support shaft, with a side view of the base end shaft (a), a partially cross-sectional side view of the tip end shaft (b), a bottom view of the base end shaft (c), and a cross-sectional view of the tip end shaft (d). [Diagram 5] 5A to 5C are schematic diagrams for explaining the operation of the lighting fixture rotation mechanism according to the embodiment. [Figure 6] The figures show the connecting shaft portion, including a side view (a) and a front view (b) of the connecting shaft portion extended straight in the axial direction relative to the support shaft, and a front view (c) and a bottom view (d) of the connecting shaft portion rotated 90 degrees relative to the support shaft. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows, as one example of an embodiment, a lighting fixture 2 that can be detachably attached to a duct rail 4. The duct rail 4 is attached to a ceiling surface R of a room, but may be attached to another surface such as a wall surface. The lighting fixture 2 includes a lamp 3, a support shaft 5, and a case 10 provided with a terminal 11 for an electric cord h. An LED light is used as the lighting fixture 3, but various light sources such as fluorescent lamps can also be used. The lighting fixture 3 is attached to a connection shaft 9, which is connected to the support shaft 5.

[0010] As shown in FIG. 2, the case 10 is constructed by assembling a front case part 10a and a rear case part 10b, and the support shaft 5 is attached to the lower part inside the case 10. A terminal 11 is attached to the upper part inside the case 10. In the case 10, the electric cord h of the lamp 3 drawn from the support shaft 5 is connected to the terminal 11. A pair of engagement pieces 12 for connection to the duct rail 4 is formed on the upper surface of the case 10. The terminal 11 extended from inside the case 10 is disposed on the upper part of the engagement pieces 12. When the engagement pieces 12 of the case 10 are attached to the duct rail 4, the terminal 11 is electrically connected to the wiring board 41 provided on the duct rail 4, and power is supplied to the lamp 3 from an external power source. A through hole 13 through which the support shaft 5 is inserted is provided on the lower surface of the case 10. In the case 10, a circular groove forming wall 14 parallel to the lower surface is formed immediately above the lower surface. A fitting groove 15 for supporting the spindle 5 is formed between this groove forming wall 14 and the lower surface. A protrusion 16 that protrudes inward is formed on the inner periphery of the groove forming wall 14. This protrusion 16 is a component for limiting the rotation of the entire spindle 5 to within a certain range less than 360 degrees.

[0011] The support shaft 5 is configured by connecting a tip side shaft portion 51 on the attachment side of the lamp 3 and a base side shaft portion 52 supported by the case 10. The support shaft 5 is a cylindrical shaft, and the connection shaft portion 9 is a cylindrical threaded shaft 90. The electric cord h of the lamp 3 is passed through the cylindrical holes of the support shaft 5 and the connection shaft portion 9 and drawn into the case 10.

[0012] Next, the rotation mechanism 1 of the lighting device 2 will be described. As shown in FIG. 3, the rotation mechanism 1 is composed of a support shaft 5, a support plate member 6, and a stopper member 7 as main components, and is also equipped with a nut member 81 and a wave washer 82. The support shaft 5 itself is configured so that the tip side shaft portion 51 can rotate freely around the axis line within less than 360 degrees relative to the base side shaft portion 52. As shown in FIG. 4, the support shaft 5 is provided with a circumferential groove 54 (see FIGS. 4(b) and (d)) extending in the circumferential direction within a range of less than 360 degrees on the inner peripheral surface of the tip side shaft portion 51, and a protrusion 55 (see FIGS. 4(a) and (c)) disposed in the circumferential groove 54 is provided on the outer peripheral surface of the base side shaft portion 52. As a result, the tip side shaft portion 51 is configured to be rotatable around the axis line relative to the base side shaft portion 52 within a range until both ends of the circumferential groove 54 come into contact with the protrusion 55. In this embodiment, the circumferential groove 54 of the tip side shaft portion 51 is provided over a range of 330 degrees in the circumferential direction, and the tip side shaft portion 51 is rotatable over a range of approximately 330 degrees. The circumferential groove 54 may be formed in the base side shaft portion 52, and the protrusion 55 may be formed in the tip side shaft portion 51. The base side shaft portion 52 has an end on the case support side formed by a threaded shaft portion 521, and flat portions 53 parallel to the axial direction are formed on the outer circumferential surface of the threaded shaft portion 521 so as to face each other at 180 degrees positions (see FIG. 3(b)).

[0013] 3, the support plate member 6 is a rectangular plate-like metal fitting and is provided with a circular insertion hole 61. The support plate member 6 rotatably supports the spindle 5 by inserting the base end side shaft portion 52 of the spindle 5 into the circular insertion hole 61, and is fixed to the fitting groove 15 of the case 10.

[0014] The stopper member 7 is a circular plate-shaped metal fitting, and is provided with a non-circular insertion hole 71. In the non-circular insertion hole 71, a linear inner edge portion 72 is formed to face each other at a 180-degree position. The stopper member 7 is attached so as to rotate together with the support shaft 5 by inserting the screw shaft portion 521 of the base end side shaft portion 52 into the non-circular insertion hole 71 while aligning the flat portion 53 of the screw shaft portion 521 of the base end side shaft portion 52 with the inner edge portion 72 of the non-circular insertion hole 71. In addition, a convex piece 73 is formed on the outer periphery of the stopper member 7 so as to protrude outward. The stopper member 7 prevents the entire support shaft 5 from rotating 360 degrees or more with respect to the case 10 by the convex piece 73 hitting the protrusion portion 16 formed on the inner periphery of the groove forming wall 14 that forms the fitting groove 15 of the case 10. In this embodiment, the convex piece 73 is formed over a 60-degree range in the circumferential direction of the outer periphery of the stopper member 7. As a result, the stopper member 7 allows the entire support shaft 5 to rotate relative to the case 10 within a range of 300 degrees, which is the range in which the protruding piece 73 is not formed.

[0015] The nut member 81 is screwed onto the threaded shaft portion 521 of the base-end side shaft portion 52 to hold the support plate member 6 and the stopper member 7 on the base-end side shaft portion 52 .

[0016] The above-mentioned components are fixed by inserting a wave washer 82 into the threaded shaft portion 521, which is the end of the base-side shaft portion 52 of the support shaft 5, then inserting the support plate member 6 and the stopper member 7 in this order, and finally screwing in the nut member 81. Next, when attaching the support shaft 5 to the case 10, the support plate member 6 fixed to the end of the base-side shaft portion 52 is fitted into the fitting groove 15 in the front case portion 10a or the rear case portion 10b of the case 10, the stopper member 7 is placed on the inner periphery of the groove forming wall 14 of the fitting groove 15, and the front case portion 10a and the rear case portion 10b are fitted together and fixed with screws, thereby forming the lighting fixture rotation mechanism 1. When assembling the front case portion 10a and the rear case portion 10b, the electric cord h of the lamp 3 drawn out from the cylindrical hole of the support shaft 5 is attached to the terminal 11. Then, the lighting fixture 2 is installed on the duct rail 4 by fixing the lamp 3 to the connection shaft portion 9 and attaching the case 10 to the duct rail 4.

[0017] Next, the operation of this lighting fixture rotation mechanism 1 will be described. As shown in FIG. 5, in the lighting fixture rotation mechanism 1, the shaft 5 to which the lamp 3 is attached is rotatably supported by the support plate member 6. Therefore, when the lamp 3 is rotated to one side and the entire shaft 5 rotates to one side (for example, in a clockwise direction), the stopper member 7 rotates together with the shaft 5 (rotating from the state shown in FIG. 5(a) to the state shown in FIG. 5(b)). When the stopper member 7 rotates by a predetermined angle less than 360 degrees (300 degrees in the embodiment) in conjunction with the rotation of the entire shaft 5, and one end side of the convex piece 73 of the stopper member 7 hits the protrusion 16 of the case 10, the rotation of the entire shaft 5 is prevented (see FIG. 5(b)). Next, the tip side shaft portion 51 of the shaft 5 itself rotates to one side (clockwise direction) with respect to the base end side shaft portion 52 whose rotation is prevented by the stopper member 7 (rotating from the state shown in FIG. 5(c) to the state shown in FIG. 5(d)). When the tip side shaft portion 51 rotates a predetermined angle less than 360 degrees (330 degrees in this embodiment) and one end side of the circumferential groove 54 of the tip side shaft portion 51 comes into contact with the protrusion 55 of the base side shaft portion 52, the rotation of the tip side shaft portion 51 is prevented (see Figure 5 (d)).

[0018] When the lamp 3 is rotated in the other direction opposite to the above, and the entire shaft 5 rotates in the other direction (for example, counterclockwise), the stopper member 7 rotates together with the shaft 5 (rotating from the state of FIG. 5(b) to the state of FIG. 5(a)). When the stopper member 7 rotates by a predetermined angle less than 360 degrees (300 degrees in this embodiment) in conjunction with the rotation of the entire shaft 5, and the other end side of the convex piece 73 of the stopper member 7 hits the protrusion 16 of the case 10, the rotation of the entire shaft 5 is prevented (see FIG. 5(a)). Next, the tip side shaft portion 51 of the shaft 5 itself rotates in the other direction (counterclockwise) relative to the base side shaft portion 52 whose rotation is prevented by the stopper member 7 (rotating from the state of FIG. 5(d) to the state of FIG. 5(c)). When the tip side shaft portion 51 rotates a predetermined angle less than 360 degrees (330 degrees in this embodiment) and the other end side of the circumferential groove 54 of the tip side shaft portion 51 comes into contact with the protrusion 55 of the base side shaft portion 52, the rotation of the tip side shaft portion 51 is prevented (see Figure 5 (c)).

[0019] In this way, the entire shaft 5 is allowed to rotate freely around the axis by the support plate member 6, while the stopper member 7 allows it to rotate within a predetermined angle range less than 360 degrees (e.g., 300 degrees) until one end side and the other end side of the convex piece 73 of the stopper member 7 hit the protrusion 16 of the case 10 (see Figs. 5(a) and 5(b)). When the rotation of the entire shaft 5 is prevented by the stopper member 7, the tip side shaft portion 51 of the shaft 5 itself rotates around the axis relative to the base side shaft portion 52 within a predetermined angle range less than 360 degrees (e.g., 330 degrees) (see Figs. 5(c) and 5(d)). Therefore, the lamp 3 of the lighting fixture 2 is allowed to rotate an additional predetermined angle range until the rotation of the entire shaft 5 is prevented by the stopper member 7 in addition to the rotation of the shaft 5 itself (rotation of the tip side shaft portion 51), and as a result, it can rotate within a range of 360 degrees or more and less than 720 degrees. Therefore, the lighting device 3 can illuminate any location within a 360-degree range, improving the usability of the lighting apparatus 2.

[0020] On the other hand, the electric cord h of the lighting device 3 passed through the cylindrical hole of the shaft 5 is also twisted 360 degrees or more, the same as the rotation range of the lighting device 3, but the rotation of the entire shaft 5 is restricted by the stopper member 7 to within a predetermined angle range less than 360 degrees. As a result, the lighting device 3 cannot be rotated in one direction more than 720 degrees (two or more rotations) even when combined with the rotation of the shaft 5 itself. In this embodiment, the rotation of about 300 degrees restricted by the stopper member 7 and the rotation of the shaft 5 itself of about 330 degrees prevent the electric cord h from being rotated in one direction more than 630 degrees. Therefore, it is possible to prevent the electric cord h from being excessively twisted two or more times and breaking.

[0021] As shown in FIG. 6, the connection shaft 9 to which the lamp 3 is attached is rotatable so as to bend within a 90-degree range with respect to the axial direction of the support shaft 5. The tip of the tip-side shaft 51 of the support shaft 5 is provided with a rectangular notch 56 (see FIG. 6(a)(d)) that continues from the tip surface to the outer circumferential surface. The connection shaft 9 has a spherical connection end 91 that is fitted to the tip of the tip-side shaft 51, and a screw shaft 90 extending from the connection end 91 has a flat surface 92 that is aligned with the notch 56 of the tip-side shaft 51 and parallel to the axial direction and faces the notch 56 at a 180-degree position. As a result, the connection shaft 9 is supported by the tip of the tip-side shaft 51, and the flat surface 92 is guided along the notch 56 of the tip-side shaft 51 to be rotatable so as to bend within a 90-degree range. In the lighting fixture rotation mechanism 1 of the embodiment, the lighting fixture 3 can be rotated within a 90-degree range from directly below to directly to the side in the horizontal direction to illuminate. Therefore, the lighting fixture 3 can be arbitrarily rotated within a 90-degree range from directly below to directly to the side, and within a 360-degree range around the support shaft 5. Therefore, any place that requires illumination can be illuminated within a hemispherical range, and the usability of the lighting fixture 2 can be further improved.

[0022] The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. [Explanation of symbols]

[0023] 1 Lighting fixture rotation mechanism 2. Lighting equipment 3 Lights 4. Duct rail 5 spindle 6 Support plate member 7 Stopper member 9 Connection shaft 10 Cases 10a Front case part 10b Rear case part 11 Terminal 12 Engagement piece 13 Through hole 14 Groove forming wall 15 Fitting groove 16 Protrusion 41 Wiring board 51 Tip side shaft 52 Proximal shaft part 53 Plane part 54 Circumferential groove 55 Protrusion 56 Notch 61 Circular Through Hole 71 Non-circular through hole 72 Inner edge 73 Convex piece 81 Nut material 82 Wave washer 90 Screw shaft 91 Connection end 92 Flat surface of connecting shaft 521 Screw shaft h Electrical cord R Ceiling surface

Claims

1. a support shaft which is a cylindrical shaft through which an electric cord of a lighting fixture is inserted, the support shaft being connected to a tip end shaft portion to which the lighting fixture is attached and a base end shaft portion supported by a case, the tip end shaft portion being connected to the base end shaft portion so as to be rotatable around an axis by less than 360°, and the base end shaft portion having a flat surface formed on its outer circumferential surface parallel to the axial direction; a support plate member having a circular insertion hole, the support plate member being fixed to a fitting groove of the case by inserting a base end side shaft portion of the support shaft into the circular insertion hole to support the entire support shaft rotatably about its axis; a stopper member having a non-circular insertion hole, a linear inner edge portion formed in the non-circular insertion hole, a flat portion of a base end shaft portion of the spindle being aligned with the inner edge portion so that the base end shaft portion is inserted into the non-circular insertion hole and rotates together with the entire spindle, and a protruding piece is formed on the outer periphery, the protruding piece coming into contact with a protrusion formed on a groove forming wall of the fitting groove of the case to prevent the entire spindle from rotating more than 360 degrees; A lighting fixture rotation mechanism comprising: a nut member that screws into a base end shaft portion of a support shaft through which the support plate member and the stopper member are inserted to hold the support plate member and the stopper member on the base end shaft portion.

2. 2. The lighting fixture rotation mechanism according to claim 1, A lighting fixture rotation mechanism, wherein one of the tip side shaft portion and the base side shaft portion of the support shaft has a circumferential groove extending circumferentially over a range of less than 360 degrees on its inner surface, and the other of the tip side shaft portion and the base side shaft portion has a protrusion disposed within the circumferential groove on its inner surface.

3. 3. The lighting fixture rotation mechanism according to claim 1, A cylindrical connecting shaft is connected to the tip of the support shaft and an electrical cord is inserted through the connecting shaft. A lighting fixture rotation mechanism in which a notch is provided at the tip of the tip side shaft portion, the notch continuing from the tip surface to the outer circumferential surface, and the connecting shaft portion is connected so as to be rotatable within a range of 90 degrees along the notch.

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