DRILL-FREE MOUNTING DEVICE FOR CURTAIN RAILS

Abstract

A drill-free curtain track mounting device is provided, comprising: a housing 10 with a rotating shaft 20, an internal threaded ring 30, a screw shaft 40, and an arm 50. A drive bevel gear 22 on the rotating shaft 20 drives a driven bevel gear 32 on the internal threaded ring 30, which is coupled to the screw shaft 40 to move the screw shaft 40, thereby bringing a pressure surface 41 on the screw shaft 40 close to a connecting pressure surface 54 of the arm 50. Therefore, the drill-free curtain track mounting device operates quickly and precisely.

Description

BACKGROUND OF THE INVENTION 1. Technical Field

[0001] The present invention relates to a device for attaching and fastening curtain rails, in particular a drill-free fastening device for curtain rails. 2. Description of the state of the art

[0002] Traditional techniques for hanging curtains involve attaching a track fixing device to the wall or window frame and then hanging the curtains from the track fixing device. These traditional techniques have the disadvantage of requiring a destructive fastening process to the wall or window frame before the track fixing device can be installed. This might involve, for example, drilling holes into the wall or window frame with nails or bolts to secure the nails or bolts.

[0003] For this reason, drill-free curtain tracks have been proposed. For example, Chinese patent 218234690U discloses a drill-free fastening mechanism for attaching curtains, and Chinese patent 220599677 discloses a drill-free mounting bracket. Furthermore, US patent 10597938 discloses a curtain mounting unit. The patents disclose that the purpose of drill-free mounting of a curtain frame is achieved by coordinating two screw shafts or by coordinating one screw shaft and a bolt. However, the patents have disadvantages, namely difficult handling and time-consuming operation. Additionally, CN211473966 U discloses a drill-free mounting device for attaching a curtain to the mounting base with an ejector block that is slidably provided on the mounting base. A self-locking unit serves to eject and retract the ejector block.Because part of the self-locking unit protrudes from the mounting base, it can be easily adjusted. Since the self-locking unit is located away from the upper block, it cannot be accidentally moved during adjustment, even when approaching the wall. This allows for more convenient and faster installation.

[0004] Let us take as an example the setup described in Chinese patent 218234690U. A drive component must complete several revolutions before a worm gear section of a connecting component completes one revolution, and the worm gear section must complete one revolution for a screw shaft section to complete one revolution, allowing a locking block to move slightly forward or backward. However, the aforementioned method is neither efficient nor ideal. BRIEF SUMMARY OF THE INVENTION

[0005] One objective of the invention is to provide a drill-free fastening structure for curtain rails that is quick, easy and convenient to install.

[0006] To solve the aforementioned and other problems, the disclosure provides a drill-free curtain track fastening device comprising: a housing with one side provided with a through-hole and one end provided with an opening that communicates with a receiving chamber, wherein a polygonal support element is arranged between the opening and the receiving chamber and has two arcuate sides, wherein a circular receiving section is arranged on another side of the receiving chamber, wherein a guide groove is arranged on one side of the circular receiving section and corresponds in shape to the polygonal support element, and wherein an annular groove is arranged on the other side of the circular receiving section; a rotating shaft arranged at the through-hole of the housing and on one side of the receiving chamber.wherein an inner polygonal opening is arranged at one end of the rotating shaft and projects from the through-hole of the housing, and wherein a drive bevel gear is arranged at another end of the rotating shaft; an internal threaded ring arranged on the circular receiving section in the housing and having an internal threaded hole, wherein a driven bevel gear is arranged on the internal threaded ring and configured to engage with the drive bevel gear on the rotating shaft, thereby keeping the driven bevel gear stationary while the rotating shaft rotates the internal threaded ring; an internal threaded ring arranged on the circular receiving section in the housing and having an internal threaded hole, wherein a driven bevel gear is arranged on the internal threaded ring and configured to mesh with the drive bevel gear on the rotating shaft, thereby keeping the driven bevel gear stationary while the rotating shaft rotates the internal threaded ring.wherein an annular rib is arranged on the rear side of the driven bevel gear; a screw shaft with two arcuate sides and a polygonal circumference extending over the polygonal support element of the housing and corresponding in its position to the guide groove of the housing, and projecting through the internal threaded bore of the internal threaded ring, and engaging with the internal threaded bore, and driven by the rotation of the internal threaded ring to move without rotation, and having a pressure surface at its end, wherein the pressure surface has a polygonal through-bore, the polygonal through-bore having a bearing surface therein with a through-bore having a diameter smaller than the polygonal through-bore; an arm with a slender rod section, wherein the rod section has a polygonal section and a penetration positioning section,wherein the polygonal section has one end provided with a connecting pressure surface and another end connected to the penetration positioning section, wherein the penetration positioning section has one end provided with a snap-engagement section, wherein the penetration positioning section has an outer diameter smaller than that of the polygonal segment to form a shoulder surface at a junction between the polygonal segment and the penetration positioning section, thereby allowing the rod section of the arm to be positioned penetrationally in the polygonal through-bore of the screw shank and allowing the snap-engagement section of the arm to penetrate the through-bore on the bearing surface and snap into engagement with the bearing surface; and a spring,which is provided on the penetration positioning segment of the arm and is thus located in the polygonal through-hole of the screw shaft.

[0007] In view of the foregoing technical features, the number of teeth on the drive bevel gear on the rotating shaft is, according to the invention, at least 0.7 times the number of teeth on the driven bevel gear on the internal threaded ring. Therefore, according to the invention, the drive bevel gear of the rotating shaft quickly and precisely rotates the driven bevel gear of the internal threaded ring and is thus articulated with the screw shaft to move the screw shaft, whereby the movement of the screw shaft causes the pressure surface to move towards the rear of the connecting pressure surface of the arm to secure the arm in its position. BRIEF DESCRIPTION OF THE DIFFERENT VIEWS OF THE DRAWINGS Fig. Figure 1 is a perspective view of the invention. Fig. Figure 2 is an exploded view of the invention. Fig. Figure 3 is a sectional view along line 3-3 in Fig. 1. Fig. 4, which are essentially with Fig. Figure 3 is identical and shows a cross-sectional view of a displaced screw shaft. Fig. 5, which are essentially with Fig. Figure 3 is identical and shows the state of a pressure surface of the screw shaft pressing against a rear side of a connecting pressure surface of an arm. DETAILED DESCRIPTION OF THE INVENTION

[0008] The directional references used herein, including the description of the embodiments and claims, are to be interpreted in accordance with the accompanying drawings. Identical reference numerals in the embodiments and the accompanying drawings denote identical or similar components or structural features thereof. The directions indicated herein are those in the accompanying drawings, provided for ease of description, and are not restrictive.

[0009] With reference to the Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5 A drill-free curtain track mounting structure is provided, comprising a housing 10, a rotating shaft 20, an internal threaded ring 30, a screw shaft 40, an arm 50 and a spring 60.

[0010] The housing 10 consists of two interconnected housing parts 11. A through-hole 12 is arranged on one side of the housing 10. An opening 13 is provided at one end of the housing 10. A rotating shaft retaining section 14 is arranged at the through-hole 12. The opening 13 is connected to a receiving chamber 15. A polygonal support element 16 with two arcuate sides is arranged between the opening 13 and the receiving chamber 15. A round receiving section 17 is provided on the other side of the receiving chamber 15. A guide groove 18, which corresponds in shape to the polygonal support element 16, is provided on one side of the round receiving section 17. An annular groove 19 is provided on the other side of the round receiving section 17. Although an annular groove is arranged on the other side of the round receiving section in this embodiment, the disclosure is not limited to this.In one variant embodiment, the ring-shaped groove is replaced by a ring-shaped rib.

[0011] The rotating shaft 20 is arranged on the rotating shaft support section 14 at the through-bore 12 and positioned on one side of the receiving chamber 15. An inner polygonal hole 21 is arranged at one end of the rotating shaft 20. The inner polygonal opening 21 is visible from the through-hole of the housing 12. A drive bevel gear 22 is provided at the other end of the rotating shaft 20. In this embodiment, the inner polygonal opening is a hexagonal opening, although the invention is not limited to this. In an alternative embodiment, the inner polygonal opening is a triangular opening, a square opening, a cross-shaped opening, or a straight slot.

[0012] The internal threaded ring 30 is arranged on the round receiving section 17 in the housing 10. The internal threaded ring 30 has an internal threaded bore 31. A driven bevel gear 32 is arranged on one side of the internal threaded ring 30. The driven bevel gear 32 meshes with, or is in engagement with, the drive bevel gear 22 on the rotating shaft 20. The rear side of the driven bevel gear 32 on the internal threaded ring 30 is provided with an annular rib 33 and engages in the annular groove 19, thereby keeping the driven bevel gear 32 stationary while the rotating shaft 20 rotates the internal threaded ring 30. In this embodiment, the annular rib 33 is arranged on the rear side of the driven bevel gear on the internal threaded ring, although the invention is not limited thereto. In an alternative embodiment, the annular rib 33 is replaced by an annular groove that is symmetrical to a spherical container.

[0013] The screw shaft 40 has two arcuate sides and a polygonal circumference and spans the polygonal support element 16 of the housing 10. Threads are arranged on the circumferential surface of the screw shaft 40. The screw shaft 40 is positioned in relation to the guide groove 18 of the housing 10 and passes through the internal threaded bore 31 of the internal threaded ring 30 to engage with the internal threaded bore 31. The screw shaft 40 is driven by the rotation of the internal threaded ring 30 to move without rotation. A pressure surface 41 is provided at one end of the screw shaft 40, which has a polygonal through-bore 42. The polygonal through-bore 42 is arranged along the longitudinal axis of the screw shaft 40. The polygonal through-bore 42 has a bearing surface 43 inside its interior.The bearing surface 43 has a diameter that is smaller than a through-hole 44 of the polygonal through-hole 42.

[0014] The arm 50 has a slender rod section 51. The rod section 51 has a polygonal segment 52 and a through-positioning segment 53. In this embodiment, the polygonal segment 52 has a hexagonal cross-section, although the invention is not limited thereto. In an alternative embodiment, the polygonal segment 52 has a triangular or square cross-section and corresponds in shape to the polygonal through-bore 42 of the screw shaft 40. The diameter of a hypothetical outer circle defined by the polygonal segment 52 is larger than the outer diameter of the spring 60. The polygonal segment 52 is provided at one end with a connecting pressure surface 54 and at the other end is connected to the through-positioning segment 53. A detent section 55 is arranged at one end of the through-positioning segment 53.The outer diameter of the through-positioning segment 53 is smaller than that of the polygonal segment 52. Thus, a shoulder surface 56 is formed at the connection point between the polygonal segment 52 and the through-positioning segment 53. The rod section 51 of the arm 50 is arranged to pass through the polygonal through-bore 42 of the screw shaft 40. The locking section 55 of the arm 50 projects into the through-bore 44 on the bearing surface 43 and locks into the bearing surface 43.

[0015] The spring 60 is attached to the through-positioning segment 53 of the arm 50 and is thus located in the polygonal through-bore 42 of the screw shaft 40. The spring 60 has one end that rests against the shoulder surface 56 of the arm rod section 51, while the other end rests against the bearing surface 43 in the polygonal through-bore.

[0016] Due to its design features described above, the drill-free curtain track mounting device of the present invention is arranged at both ends of a conventional curtain track (as in conventional products). Under normal conditions, the arm 50 protrudes from the opening 13 of the housing 10 due to the elasticity of the spring 60. As shown in the Fig. 1 and Fig.As shown in Figure 3, to mount the curtain track, the user presses the connecting pressure surface 54 against one side of the window frame to compress the spring 60 and retract the arm 50 relative to the screw shaft 40. The user then aligns the other end of the curtain track against the opposite side of the window frame so that the arm 50 is extended due to the elasticity of the spring 60, allowing the connecting pressure surface 54 of the arm 50 to rest against the window frame. The elasticity of the spring 60 must be sufficient to support the weight of the curtain so that the curtain can temporarily utilize the spring's elasticity to rest against and be attached to the window frame.

[0017] To perform a fastening operation, the user rotates the pivot shaft 20 by turning the inner polygonal hole, so that the drive bevel gear 22 on the pivot shaft 20 drives the driven bevel gear 32 on the internal threaded ring 30 to rotate the internal threaded ring 30. This connects the inner threaded bore 31 of the internal threaded ring 30 to the screw shaft 40, thus moving the screw shaft 40. Since the contact pressure surface 54 of the arm 50 rests against the window frame or the wall, the contact surface 41 of the screw shaft 40 can gradually approach the contact pressure surface 54 of the arm 50 and press against its rear side. Therefore, the user can fasten the arm 50 so that the curtain track rests against both sides of the window frame for a drill-free installation.

[0018] According to the disclosure, the number of teeth on the drive bevel gear 22 on the rotating shaft 20 is at least 0.7 times, preferably 0.7 to 1.5 times, the number of teeth on the driven bevel gear 32 on the internal thread ring 30. Thus, if the number of teeth on the driven bevel gear 32 on the internal thread ring 30 is 10, the number of teeth on the drive bevel gear 22 on the rotating shaft 20 is 7 to 15. This ensures that the rotational energy of the rotating shaft 20 is transferred precisely and efficiently to the screw shaft 40, allowing the screw shaft 40 and the pressure surface 41 to move efficiently.

Claims

[1] Drill-free fastening device for curtain rails, comprising: a housing 10 with one side having a through-hole 12 and one end having an opening 13 which is connected to a receiving chamber 15, wherein a polygonal support element 16 is arranged between the opening 13 and the receiving chamber 15 and has two arcuate sides, wherein a round receiving section 17 is arranged on another side of the receiving chamber 15, wherein a guide groove 18 is arranged on one side of the round receiving section 17 and corresponds in shape to the polygonal support element 16; a rotary shaft 20, which is arranged at the through-opening 12 of the housing 10 and positioned on one side of the receiving chamber 15, wherein an inner polygonal opening 21 is arranged at one end of the rotary shaft 20 and protrudes from the through-opening 12 of the housing 10, and wherein a drive bevel gear 22 is arranged at another end of the rotary shaft 20; an internal threaded ring 30, which is arranged on the round receiving section 17 in the housing 10 and has an internal threaded bore 31, wherein a driven bevel gear 32 arranged on the internal threaded ring 30 is designed such that it engages with the drive bevel gear 22 on the rotating shaft 20, whereby the drive bevel gear 22 is immobile while the rotating shaft 20 sets the internal threaded ring 30 in rotation; a screw shaft 40 with two arcuate sides and a polygonal circumference, extending over the polygonal support element 16 of the housing 10, and whose position corresponds to the guide groove 18 of the housing 10, and projecting through the internal threaded bore 31 of the internal threaded ring 30, which engages with the internal threaded bore 31, and is moved by the rotation of the internal threaded ring 30 without rotation and has a pressure surface 41 at its end, wherein the pressure surface 41 has a polygonal through bore 42 in which a bearing surface 43 with a through bore 44 is provided, the diameter of which is smaller than that of the polygonal through bore 42; an arm 50 with a slender rod section 51, wherein the rod section 51 has a polygonal segment 52 and a through-positioning segment 53, wherein the polygonal segment 52 has one end with a connecting pressure surface 54 and another end that is connected to the through-positioning segment 53, wherein the through-positioning segment 53 has one end that is provided with a detent section 55, wherein the through-positioning segment 53 has an outer diameter that is smaller than that of the polygonal segment 52 in order to allow the formation of a shoulder surface 56 at a connection point between the polygonal segment 52 and the through-positioning segment 53, whereby the rod section 51 of the arm 50 can be positioned through the polygonal through-bore 42 of the screw shank 40,and whereby the rod section 51 of the arm 50 can be positioned penetrating into the polygonal through-bore 42 of the screw shaft 40 and whereby the locking section 55 of the arm 50 can penetrate into the through-bore 44 on the bearing surface 43 and engage with the bearing surface 43; and, a spring 60 which is attached to the penetrating positioning segment 53 of the arm 50 and thus arranged in the polygonal through hole 42 of the screw shaft 40, wherein the spring 60 has one end which rests against the shoulder surface 56 of the rod section 51 of the arm 50 and another end which rests against the bearing surface 43 in the polygonal through hole 42. [2] Drill-free curtain rail fastening device according to claim 1, wherein the through-hole 12 has a rotary shaft retaining section 14 and the rotary shaft 20 is arranged on the rotary shaft retaining section 14 on the through-hole 12 of the housing 10. [3] A drill-free curtain rail fastening device according to one of the preceding claims, wherein the number of teeth on the drive bevel gear 22 on the rotating shaft 20 is 0.7 to 1.5 times the number of teeth on the driven bevel gear 32 on the internal thread ring 30. [4] Drill-free curtain rail fastening device according to claim 3, wherein the housing consists of two interconnected housing components 11. [5] Drill-free curtain track fastening device according to claim 1, wherein the diameter of a hypothetical outwardly adjacent circle defined by the polygon segment 52 of the arm 50 is larger than the outer diameter of the spring 60. [6] Drill-free curtain track fastening device according to claim 1, wherein the elasticity of the spring 60 is greater than the weight of a curtain. [7] Drill-free curtain rail fastening device according to claim 4, wherein the round receiving section 17 is provided with an annular groove 19 and a rear side of the driven bevel gear 22 on the internal thread ring 30 is provided with an annular rib 33 and engages in the annular groove 19.

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