A handle rotation limiting structure

Abstract

The invention discloses a handle rotation limiting structure, comprising a valve body, a mounting hole, a valve stem, a flat shaft and a handle, etc., mainly a long circular hole is arranged on the top of the mounting hole, the long circular hole is composed of two symmetrical arc-edge inner walls and two symmetrical straight-edge inner walls enclosed by the same axis; the flat shaft is composed of two symmetrical outer arc surfaces, two symmetrical straight surfaces, and two pairs of symmetrical inclined surfaces connected between each adjacent outer arc surface and straight surface; when working, after one pair of symmetrical inclined surfaces of the flat shaft are respectively in contact with the two straight-edge inner walls of the long circular hole, the flat shaft can be limited by rotating until the other pair of symmetrical inclined surfaces are respectively in contact with the two straight-edge inner walls of the long circular hole, thereby forming positive and negative fixed angle rotation; therefore, the improved structure has the advantages of simple structure, simple processing, easy assembly, etc., and it can better solve the skew deviation phenomenon of the handle after assembly and ensure that the error of the handle rotation limiting angle after assembly is controlled within a smaller range.

Description

Technical Field

[0001] The invention relates to a handle rotation limiting structure, which is particularly suitable for the assembly and correction of handles of right-angle valves and water spouts with various opening and closing functions. Background Art

[0002] In the existing right-angle valve and faucet structures, the valve stem is rotatably installed in the mounting hole of the valve body to open and close the valve. A 90° rotation limit structure is also set between the valve stem and the valve body to facilitate the user to grasp the open position or closed position of the valve. Most of these rotation limit structures are external structures, which are easily damaged by accidental bumps and lead to limit failure. Although there are also internal limit structures on the market, such structures often require drilling, grooving, pinning and other processing on the valve stem or valve body, which has defects such as inconvenient processing, troublesome assembly process, and easy to cause the installation structure to be complicated. At the same time, these internal limit structures are also easily affected by the processing accuracy and assembly accuracy and have large errors, that is, the error of the handle rotation limit angle will be greater than or less than 0.5°, so the accuracy of the handle rotation opening and closing angle cannot be guaranteed, and it is difficult to meet specific styling requirements. In addition, the above-mentioned valves often use quick-opening valve cores with splines on the top of the valve stem. The assembly connection between the handle and the top of the valve stem is basically achieved through the meshing of the spline teeth, that is, the most appropriate spline tooth position is selected, and then the two are fastened with screws; since the number of spline teeth is generally 20 to 27, the handle after assembly generally has skew deviations, and the maximum skew angle of the coaxiality between the handle and the axis of the valve body can even reach 9°, which greatly affects the appearance of the product. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a handle rotation limiting structure which has a simple structure, is easy to process, is easy to assemble, can better solve the skew deviation phenomenon of the handle after assembly and ensure that the error of the handle rotation limiting angle after assembly is controlled within a smaller range.

[0004] The technical problem of the present invention is achieved through the following technical solutions:

[0005] A handle rotation limit structure comprises a valve body, a valve stem and a handle; the valve stem is rotatably installed in the mounting hole of the valve body, the top of the valve stem is provided with a flat shaft extending out of the mounting hole and fixed to the handle, the top of the mounting hole is provided with an oblong hole, the oblong hole is composed of two symmetrical arc-edge inner walls and two symmetrical straight-edge inner walls enclosed by the same axis; the flat shaft is composed of two symmetrical outer arc surfaces enclosed by the same axis, two symmetrical straight surfaces, and two pairs of symmetrical inclined surfaces connected between each adjacent outer arc surface and straight surface; after one pair of symmetrical inclined surfaces of the flat shaft respectively contacts the two straight-edge inner walls of the oblong hole, the flat shaft rotates until the other pair of symmetrical inclined surfaces respectively contacts the two straight-edge inner walls of the oblong hole to form positive and negative fixed angle rotation limits.

[0006] The positive and negative fixed-angle rotation limiting angles α formed by the flat shaft in the oblong hole are 90°±0.5°.

[0007] The distance between the two symmetrical outer arc surfaces of the flat shaft is greater than the distance between the two symmetrical straight edge inner walls of the oblong hole, and the distance between the two symmetrical outer arc surfaces of the flat shaft is less than the distance between the two symmetrical arc edge inner walls of the oblong hole.

[0008] The distance between each pair of symmetrical inclined surfaces of the flat shaft is smaller than the distance between the two symmetrical arc-edge inner walls of the oblong hole, and the distance between each pair of symmetrical inclined surfaces of the flat shaft is greater than or equal to the distance between the two symmetrical straight-edge inner walls of the oblong hole.

[0009] The mounting hole is a round hole, the bottom of the valve stem is a round shaft rotatably mounted in the mounting hole, and a double-channel sealing ring is arranged between the round shaft and the mounting hole.

[0010] The outer surface of the circular shaft is provided with a mounting ring groove for embedding the double-pass sealing ring.

[0011] The lower end of the valve stem is provided with an anti-slip outer shoulder with a diameter larger than the mounting hole.

[0012] The bottom surface of the valve stem is provided with tightening ribs.

[0013] The top of the handle is provided with a screw for fixing the handle and the flat shaft.

[0014] A top hole for installing a screw is arranged on the top of the handle, and a top cover for covering and sealing the screw is arranged in the top hole.

[0015] Compared with the prior art, the present invention mainly proposes a handle rotation limit structure with an updated structure, which includes an oblong hole at the top of the mounting hole for the valve stem to be rotatably mounted, the oblong hole is composed of two symmetrical arc-edge inner walls and two symmetrical straight-edge inner walls enclosed by the same axis; and the flat shaft exposed outside the mounting hole at the top of the valve stem is composed of two symmetrical outer arc surfaces enclosed by the same axis, two symmetrical straight surfaces, and two pairs of symmetrical inclined surfaces connected between each adjacent outer arc surface and straight surface; when working, after one pair of symmetrical inclined surfaces of the flat shaft are respectively in contact with the two straight-edge inner walls of the oblong hole, the flat shaft is rotated until the other pair of symmetrical inclined surfaces are respectively in contact with the oblong hole. The two straight-edge inner walls can be limited, thereby forming positive and negative fixed-angle rotation; and this rotation limiting structure that adopts the flat shaft inclined surface that rotates with each other to fit the straight-edge inner wall of the oblong hole not only has the advantages of simple structure, simple processing, and easy assembly, but also can ensure that the error of the handle rotation limit angle after assembly is controlled within a smaller range, so that the handle rotation opening and closing angle is more precise and meets specific styling requirements; at the same time, the special design of the flat shaft is used to connect with the handle to replace the traditional spline tooth matching connection structure, which also better solves the skew deviation phenomenon of the handle after assembly, making the overall appearance of the product coordinated, beautiful, and integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional exploded view of the present invention.

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure after removing the handle.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the valve body.

[0019] Figure 4 for Figure 3 Top view of the .

[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of the valve stem.

[0021] Figure 6 for Figure 5 A magnified top view of .

[0022] Figure 7 Schematic diagram of the starting limit structure for valve stem rotation (a pair of symmetrical inclined surfaces of the flat shaft respectively contact the two straight inner walls of the oblong hole).

[0023] Figure 8 It is a structural schematic diagram of the positive and negative fixed angle rotation limit angles of the valve stem.

[0024] Fig. 9 Schematic diagram of the stop limit structure for valve stem rotation (the other pair of symmetrical inclined surfaces of the flat shaft respectively contact the two straight inner walls of the oblong hole). DETAILED DESCRIPTION

[0025] The embodiments of the present invention will be described in detail below with reference to the above-mentioned drawings.

[0026] like Figure 1 to Figure 9 As shown, 1. valve body, 11. mounting hole, 12. oblong hole, 121. arc edge inner wall, 122. straight edge inner wall, 13. anti-slip groove, 2. valve stem, 21. flat shaft, 211. outer arc surface, 212. straight surface, 213. inclined surface, 22. mounting ring groove, 23. anti-slip outer shoulder, 24. rotating rib, 3. handle, 31. top hole, 4. screw, 5. top cover, 6. double-pass sealing ring.

[0027] A handle rotation limiting structure, such as Figure 1 , Figure 2 As shown, it mainly relates to a handle rotation limiting structure of a right-angle valve or faucet, which can control the starting position and rotation angle of the handle 3, and its structure includes a valve body 1, a valve stem 2 and a handle 3.

[0028] The valve stem 2 is rotatably mounted in the mounting hole 11 of the valve body 1. Figure 3 , Figure 4 The figure shows a circular hole with an oblong hole 12 on the top. The oblong hole is composed of two symmetrical arc-edge inner walls 121 and two symmetrical straight-edge inner walls 122 that are coaxially enclosed, that is, it has two arc-edge inner walls 121 with exactly the same size and straight-edge inner walls 122 with exactly the same size, and the hole structure is formed by closed enclosure in the order of arc-edge inner wall 121, straight-edge inner wall 122, arc-edge inner wall 121 and straight-edge inner wall 122.

[0029] The bottom of the valve stem 2 is a round shaft rotatably mounted in the mounting hole 11, and a double-pass sealing ring 6 is provided between the round shaft and the mounting hole 11. Figure 5 , Figure 6 As shown: the outer surface of the circular shaft is provided with a double-track mounting groove 22, and each mounting groove is provided with a fixed sealing ring. The circular shaft not only forms a rotating seal with the mounting hole 11 through the double-track sealing ring 6, but also provides a certain friction force when the valve stem 2 rotates, and makes the valve stem 2 feel soft and moderate when rotating.

[0030] At the same time, the lower end of the valve stem 2 is also provided with an anti-slip outer shoulder 23 with a diameter larger than the mounting hole 11. The anti-slip outer shoulder is installed in the anti-slip groove 13 at the bottom of the mounting hole 11, which can prevent the valve stem 2 from slipping upward from the mounting hole 11 and limit the height position of the valve stem 2, so that the position of the valve stem and the handle 3 after cooperation is more suitable; the bottom surface of the valve stem 2 is provided with a tightening rib 24, which is used to assist the installation of the valve stem 2 in the mounting hole 11.

[0031] The top of the valve stem 2 is provided with a flat shaft 21 extending out of the mounting hole 11 and the oblong hole 12 and fixed to the handle 3. The flat shaft is composed of two symmetrical outer arc surfaces 211, two symmetrical straight surfaces 212, and two pairs of symmetrical inclined surfaces 213 connected between each adjacent outer arc surface 211 and straight surface 212. That is, it has two outer arc surfaces 211 with exactly the same size, two straight surfaces 212 with exactly the same size and four inclined surfaces 213 with exactly the same size, and is closed and enclosed in the order of outer arc surface 211, inclined surface 213, straight surface 212, inclined surface 213, outer arc surface 211, inclined surface 213, straight surface 212 and inclined surface 213 to form a flat shaft structure.

[0032] The flat shaft 21 is fitted in the oblong hole 12, the distance between the two symmetrical outer arc surfaces 211 of the flat shaft 21 is greater than the distance between the two symmetrical straight-edge inner walls 122 of the oblong hole 12, the distance between the two symmetrical outer arc surfaces 211 of the flat shaft 21 is less than the distance between the two symmetrical arc-edge inner walls 121 of the oblong hole 12, the distance between each pair of symmetrical inclined surfaces 213 of the flat shaft 21 is less than the distance between the two symmetrical arc-edge inner walls 121 of the oblong hole 12, and the distance between each pair of symmetrical inclined surfaces 213 of the flat shaft 21 is greater than or equal to the distance between the two symmetrical straight-edge inner walls 122 of the oblong hole 12.

[0033] Therefore, its rotation limiting structure is as follows: Figure 7 As shown in the figure, after a pair of symmetrical inclined surfaces 213 of the flat shaft 21 are respectively in contact with the two straight inner walls 122 of the oblong hole 12, the flat shaft 21 is Fig. 9 As shown in FIG. 1 , the flat shaft 21 is rotated until another pair of symmetrical inclined surfaces 213 contact the two straight inner walls 122 of the oblong hole 12 respectively. At this time, the rotation of the flat shaft 21 is limited, thereby forming the following Figure 8 Positive and negative fixed angle rotation as shown.

[0034] In this way, the rotation of the valve stem 2 can be limited. Relying on the machining accuracy of ±0.05mm, the limiting accuracy of the valve stem 2 can be controlled within ±0.5°, that is, the positive and negative fixed-angle rotation limiting angles α formed by the flat shaft 21 in the oblong hole 12 are 90°±0.5°.

[0035] The use of this rotation limit structure in which the inclined surface of the flat shaft fits the inner wall of the straight side of the oblong hole in a rotationally matched manner can not only ensure that the error of the rotation limit angle of the handle 3 after assembly is controlled within a small range of ±0.5°, and make the rotation opening and closing angle of the handle 3 more precise to meet specific styling requirements, but also has the advantages of simple structure, easy processing, and easy assembly.

[0036] In addition, the installation structure of the handle 3 and the flat shaft 21 is as follows: the handle 3 is mounted on the flat shaft 21 through a flat hole of matching shape, a top hole 31 is provided on the top of the handle 3, a screw 4 is passed through the top hole to fix the flat shaft 21 and the handle 3, and a top cover 5 is provided in the top hole 31 to cover the screw 4 and ensure the aesthetic appearance.

[0037] This flat shaft 21 with a special shape design is connected with the handle 3 to replace the traditional spline tooth connection structure, which can ensure that the coaxiality error of the handle 3 and the axis of the valve body 1 after assembly can be controlled within ±0.5°, thereby avoiding the skew deviation of the handle 3 after assembly and making the overall appearance of the product coordinated, beautiful and integrated.

[0038] The above description is only a specific embodiment of the present invention. Those skilled in the art should understand that any structural design equivalent to this embodiment should be included in the protection scope of the present invention.

Claims

1. A handle rotation limiting structure, comprising a valve body (1), a valve stem (2) and a handle (3); the valve stem (2) is rotatably mounted in a mounting hole (11) of the valve body (1), and a flat shaft (21) extending out of the mounting hole (11) and fixed to the handle (3) is provided at the top of the valve stem (2), characterized in that The top of the mounting hole (11) is provided with an oblong hole (12), which is composed of two symmetrical arc-edge inner walls (121) and two symmetrical straight-edge inner walls (122) enclosed by the same axis; the flat shaft (21) is composed of two symmetrical outer arc surfaces (211) enclosed by the same axis, two symmetrical straight surfaces (212), and two pairs of symmetrical inclined surfaces (213) connected between each adjacent outer arc surface (211) and the straight surface (212); after one pair of symmetrical inclined surfaces (213) of the flat shaft (21) respectively contacts the two straight-edge inner walls (122) of the oblong hole (12), the flat shaft (21) is rotated until the other pair of symmetrical inclined surfaces (213) respectively contacts the two straight-edge inner walls (122) of the oblong hole (12). The straight-edge inner wall (122) forms a positive and negative fixed-angle rotation limit; the distance between the two symmetrical outer arc surfaces (211) of the flat shaft (21) is greater than the distance between the two symmetrical straight-edge inner walls (122) of the oblong hole (12), and the distance between the two symmetrical outer arc surfaces (211) of the flat shaft (21) is less than the distance between the two symmetrical arc-edge inner walls (121) of the oblong hole (12); the distance between each pair of symmetrical inclined surfaces (213) of the flat shaft (21) is less than the distance between the two symmetrical arc-edge inner walls (121) of the oblong hole (12), and the distance between each pair of symmetrical inclined surfaces (213) of the flat shaft (21) is greater than or equal to the distance between the two symmetrical straight-edge inner walls (122) of the oblong hole (12).

2. A handle rotation limiting structure according to claim 1, characterized in that The positive and negative fixed-angle rotation limiting angles α formed by the flat shaft (21) in the oblong hole (12) are 90°±0.5°.

3. A handle rotation limiting structure according to claim 1, characterized in that The mounting hole (11) is a circular hole, the bottom of the valve stem (2) is a circular shaft rotatably mounted in the mounting hole (11), and a double sealing ring (6) is provided between the circular shaft and the mounting hole (11).

4. A handle rotation limiting structure according to claim 3, characterized in that The outer surface of the circular shaft is provided with a mounting ring groove (22) for embedding the double-pass sealing ring (6).

5. The handle rotation limiting structure according to claim 3, characterized in that The lower end of the valve stem (2) is provided with an anti-slip outer shoulder (23) having a diameter larger than the mounting hole (11).

6. A handle rotation limiting structure according to claim 3, characterized in that The bottom surface of the valve stem (2) is provided with a tightening rib (24).

7. The handle rotation limiting structure according to claim 1, characterized in that A screw (4) for fixing the handle (3) and the flat shaft (21) is provided on the top of the handle (3).

8. A handle rotation limiting structure according to claim 7, characterized in that The top of the handle (3) is provided with a top hole (31) for installing a screw (4), and a top cover (5) for covering and sealing the screw (4) is provided in the top hole.

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