A lens clamp mechanism for a lensometer

Abstract

The utility model belongs to the power of focal length meter technical field, especially point to a kind of mirror clamp mechanism of focal length meter, including base, mobile frame is connected with sliding along transverse on base, hinge rod one and hinge rod two cross distribution and the coaxial hinge of middle part of both is connected on mobile frame, the end of hinge rod one and hinge rod two is equipped with mirror frame clamping part, nose pad positioning block is provided on mobile frame, mobile frame is connected with linkage plate along front and back sliding, the both sides of linkage plate are respectively provided with the cooperation track of symmetrical distribution, the rear end of hinge rod one and hinge rod two is respectively connected with sliding on the cooperation track of corresponding side, reset elastic piece is equipped between mobile frame and linkage plate. The utility model structure is simple, and design is reasonable and transmission is stable and reliable, and hinge rod one and hinge rod two are hinged to rotate by linkage plate by reset elastic piece, to realize the effective clamping of left and right mirror frame of glasses, it is convenient to operate, and efficiency is high and applicable to the clamping of most specifications glasses.

Description

Technical Field

[0001] This utility model belongs to the field of focimeter technology, and specifically refers to a lens clamping mechanism for a focimeter. Background Technology

[0002] A focimeter is a key device for measuring various optical parameters of spectacle lenses (such as spherical power, cylindrical power, axis, and pupillary distance). During the measurement process, the spectacle to be measured needs to be fixed in the measurement optical path using a lens clamping mechanism before subsequent measurement operations can be performed. Therefore, it is particularly important that the lens clamping mechanism can stably hold the frame.

[0003] An existing Chinese utility model patent (authorization announcement number CN206847909U) discloses an automatic focimeter, which includes a drive mechanism, a frame fixing mechanism, and a frame. The drive mechanism is fixed to the frame, and the frame fixing mechanism is fixed to its front end. The frame fixing mechanism has adjustable lens clips on both sides, and a nose pad is located at the center of the frame fixing mechanism. That is, by placing the bridge of the glasses frame on the nose pad, the lens clips fix the lenses of the glasses to achieve fixation of the glasses on the frame fixing mechanism. However, in the above structure, the lens clips on both sides need to be manually adjusted left and right according to the actual glasses frame, which is time-consuming and inefficient. Furthermore, the lens clips inevitably cause wear and tear on the lenses. Summary of the Invention

[0004] The purpose of this invention is to provide a lens clamping mechanism for a focimeter, which uses a reset elastic element to drive the hinged rotation of hinge rod one and hinge rod two through a linkage plate to effectively clamp and fix the left and right frames of the glasses. It is convenient to operate, highly efficient, and suitable for clamping and fixing most sizes of glasses.

[0005] This utility model is implemented as follows: A lens clamping mechanism for a focimeter includes a base, a movable frame slidably connected to the base laterally, two hinge rods (one and two) intersecting and coaxially hinged at their midpoints to the movable frame, and lens frame clamping parts at the ends of both hinge rods. A nose pad positioning block is provided on the movable frame above the intersection of hinge rods. A linkage plate is slidably connected to the movable frame, and symmetrically distributed mating tracks are provided on both sides of the linkage plate. The rear ends of hinge rods are slidably connected to the mating tracks on their respective sides. A reset elastic element is provided between the movable frame and the linkage plate, which has the elasticity to drive the linkage plate forward relative to the movable frame.

[0006] In the lens clamping mechanism of the aforementioned focimeter, a self-locking track is provided on the linkage plate, and a movable component is provided on the moving frame that slides on the self-locking track. The self-locking track has a self-locking part that prevents the linkage plate from moving forward relative to the movable component, and a clamping part located behind the self-locking part that allows the linkage plate to move forward relative to the movable component. A one-way channel one for the movable component to move from the clamping part to the self-locking part and a one-way channel two for the movable component to move from the self-locking part to the clamping part are provided between the self-locking part and the clamping part.

[0007] In the lens clamping mechanism of the aforementioned focimeter, the movable frame is slidably connected to an adjusting slide plate in the front-to-back direction. A tail rod is provided at the rear end of the nose pad positioning block. The rear end of the tail rod is hinged and rotated on the adjusting slide plate. A pre-tightening spring is provided between the tail rod and the adjusting slide plate, which has an elastic force to drive the tail rod to rotate downward. When the tail rod drives the nose pad positioning block to rotate downward to a horizontal position, the front end of the adjusting slide plate is limited and abuts against the nose pad positioning block.

[0008] In the lens clamping mechanism of the aforementioned focimeter, the lens frame clamping part is an abutting rubber post, and the bottom surface of the abutting rubber post is provided with an insertion hole along its axis. The ends of the first hinge rod and the second hinge rod both extend upward to form insertion posts that can be inserted into the insertion holes.

[0009] In the lens clamping mechanism of the aforementioned focimeter, the movable component includes a metal folding rod with one end fixed to a movable frame, and the other end of the metal folding rod is a free end that is bent to form a hook-shaped or L-shaped movable end. The self-locking track is a groove structure and is formed on one side of the metal folding rod. The metal folding rod bends elastically toward the self-locking track side to realize that the movable end of the metal folding rod is inserted and slidably engaged in the self-locking track.

[0010] In the lens clamping mechanism of the aforementioned focimeter, the bottom surface of the port connecting the one-way channel one to the clamping part is lower than the bottom surface of the port connecting the one-way channel two to the clamping part, and the bottom surface of the clamping part is smoothly connected to the bottom surface of the one-way channel one.

[0011] In the lens clamping mechanism of the aforementioned focimeter, both the first unidirectional channel and the second unidirectional channel have extreme limit points that restrict the linkage plate from continuing to move backward relative to the moving part. These extreme limit points are located on the front side of the self-locking part.

[0012] In the lens clamping mechanism of the aforementioned focimeter, a pre-tightening plate capable of elastic deformation is provided on the movable frame. One end of the pre-tightening plate is fixed to the movable frame, and the other end of the pre-tightening plate is a free end. This free end is located on the side of the metal folding rod away from the linkage plate and elastically abuts against the metal folding rod.

[0013] In the above-mentioned lens clamping mechanism of a focimeter, the reset elastic element is a tension spring, and the rear ends of the linkage plate have reset parts on both sides. The two reset parts are located on the left and right sides of the movable frame, and the reset parts are connected to the corresponding sides of the movable frame through the reset elastic element.

[0014] In the lens clamping mechanism of the aforementioned focimeter, a transverse slide rail is provided on the base along the transverse direction, and the movable frame is slidably engaged on the transverse slide rail. Position switches for detecting the movable frame are provided on both the left and right sides of the transverse slide rail.

[0015] The outstanding advantages of this utility model compared to the prior art are: This utility model has a simple structure, reasonable design, and stable and reliable transmission. The reset elastic element drives the hinge rod one and the hinge rod two to rotate through the linkage plate, so as to effectively clamp and fix the left and right frames of the glasses. It is convenient to operate, efficient, and suitable for clamping and fixing most sizes of glasses. Attached Figure Description

[0016] Figure 1 This is a three-dimensional view of the focimeter of this utility model; Figure 2 This is a perspective view of the mirror clamping mechanism of this utility model; Figure 3 This is an exploded structural diagram of the mirror clamping mechanism, movable parts, and pre-tightening pressure plate of this utility model; Figure 4 This is a three-dimensional view of the linkage plate of this utility model.

[0017] In the diagram: 1. Base; 2. Movable frame; 3. Hinge rod one; 4. Hinge rod two; 5. Frame clamping part; 6. Nose pad positioning block; 7. Linkage plate; 8. Matching track; 9. Reset elastic element; 10. Self-locking track; 11. Self-locking part; 12. Clamping part; 13. One-way channel one; 14. One-way channel two; 15. Adjusting slide plate; 16. Tail rod; 17. Pre-tension spring; 18. Metal folding rod; 19. Movable end; 20. Extreme value limit point; 21. Pre-tension pressure plate; 22. Reset part; 23. Release part. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —4: A lens clamping mechanism for a focimeter includes a base 1, on which a movable frame 2 is slidably connected laterally. A first hinge rod 3 and a second hinge rod 4 are intersected and coaxially hinged at their midpoints on the movable frame 2. Each end of the first hinge rod 3 and the second hinge rod 4 is provided with a lens frame clamping part 5. A nose pad positioning block 6 is provided on the movable frame 2 above the intersection of the first hinge rod 3 and the second hinge rod 4. A linkage plate 7 is slidably connected to the movable frame 2 along its front-to-back direction. Symmetrically distributed mating tracks 8 are provided on both sides of the linkage plate 7. The rear ends of the first hinge rod 3 and the second hinge rod 4 are slidably connected to the corresponding mating tracks 8. A reset elastic element 9 is provided between the movable frame 2 and the linkage plate 7, capable of driving the linkage plate 7 forward relative to the movable frame 2.

[0019] Among them, the nose pad positioning block 6 is used to abut against the two nose pad blocks of the frame, while the hinge rod 3 and the hinge rod 4 are used to clamp the left and right frames. That is, under the elastic force of the reset elastic element 9, when the linkage plate 7 can move forward relative to the moving frame 2, the hinge rod 3 and the hinge rod 4 are driven by the linkage plate 7 to rotate hingedly, so that the rear end of the hinge rod 3 and the front end of the hinge rod 4, and the front end of the hinge rod 3 and the rear end of the hinge rod 4 can move relative to each other, thereby forming a clamping space for clamping the corresponding side frame. Correspondingly, in this embodiment, it is necessary to manually overcome the elastic force of the reset elastic element 9 so that when the linkage plate 7 moves backward relative to the moving frame 2, the hinge rod 3 and the hinge rod 4 rotate hinged under the drive of the linkage plate 7, thereby causing the rear end of the hinge rod 3 and the front end of the hinge rod 4, as well as the front end of the hinge rod 3 and the rear end of the hinge rod 4, to move in opposite directions, thereby releasing the clamping and fixing of the mirror frame.

[0020] Furthermore, in order to facilitate the application of force to overcome the elastic force of the reset elastic element 9, in this embodiment, the front ends of hinge rod 1 3 and hinge rod 2 4 are provided with release parts 23 that are symmetrically distributed on the left and right. The two release parts 23 are manually pressed on the left and right to make the hinge rod 1 3 and hinge rod 2 4 rotate, thereby driving the linkage plate 7 to move backward relative to the moving frame 2.

[0021] This utility model has a simple structure, reasonable design, and stable and reliable transmission. The reset elastic element 9 drives the hinge rod 3 and the hinge rod 4 to rotate through the linkage plate 7, so as to effectively clamp and fix the left and right frames of the glasses. It is convenient to operate, efficient, and suitable for clamping and fixing most sizes of glasses.

[0022] Furthermore, when the frame is not clamped and fixed, in order to keep the hinge rod 3 and hinge rod 4 in the extended state, the linkage plate 7 is provided with a self-locking track 10, and the movable frame 2 is provided with a movable part that slides on the self-locking track 10. The self-locking track 10 has a self-locking part 11 that prevents the linkage plate 7 from moving forward relative to the movable part, and a clamping part 12 located behind the self-locking part 11 and allowing the linkage plate 7 to move forward relative to the movable part. A one-way channel 13 for the movable part to move from the clamping part 12 to the self-locking part 11 and a one-way channel 2 14 for the movable part to move from the self-locking part 11 to the clamping part 12 are provided between the self-locking part 11 and the clamping part 12.

[0023] Its working principle is as follows: When the movable part is located inside the clamping part 12, the linkage plate 7 can move forward relative to the movable part under the elastic force of the reset elastic member 9. During this process, the hinge rod 3 and the hinge rod 4 are hinged and rotate relative to each other to clamp and fix the mirror frame. When a force is applied to overcome the elastic force of the reset elastic member 9, the linkage plate 7 can move backward relative to the movable member. The movable member will move from the clamping part 12 to the self-locking part 11 along the one-way channel 13. At this time, no force is applied. The self-locking part 11 will abut against the movable member to counteract the elastic force of the reset elastic member 9, thereby preventing the linkage plate 7 from moving forward relative to the movable member. During this process, the hinge rod 1 3 and the hinge rod 2 4 are hinged and rotated in opposite directions and remain in the unfolded state. When a force is applied again to move the linkage plate 7 backward relative to the movable part, the movable part disengages from the self-locking part 11 and enters the one-way channel 14. At this time, when no force is applied, the elastic force of the reset elastic member 9 causes the linkage plate 7 to move forward relative to the movable part. The movable part enters the clamping part 12 through the one-way channel 14. During this process, the hinge rod 3 and the hinge rod 4 first hinge and rotate in opposite directions, then hinge and rotate relative to each other to restore the clamping and fixing of the mirror frame.

[0024] Furthermore, to facilitate the movement of the movable part from the one-way channel 2 14 into the clamping part 12 in the self-locking part 11, rather than entering the one-way channel 13 and getting stuck, the movable part includes a metal folding rod 18 with one end fixed to the moving frame 2. The other end of the metal folding rod 18 is a free end and is bent to form a hook-shaped or L-shaped movable end 19. The self-locking track 10 is a groove structure and is opened on one side of the metal folding rod 18. The one-way channel 2 14 is set close to the metal folding rod 18, and the one-way channel 13 is set away from the metal folding rod 18. The metal folding rod 18 bends elastically toward the self-locking track 10 so that the movable end 19 of the metal folding rod 18 can be inserted and slidably engaged in the self-locking track 10. Under the elastic deformation force of the metal bending rod 18, the movable end 19 of the metal bending rod 18 is always attached to the side wall of the self-locking track 10 near the metal bending rod 18. Thus, when the linkage plate 7 moves back and forth relative to the movable part, the movable part can move smoothly and automatically from the clamping part 12 to the self-locking part 11 along the one-way channel 13, and then from the self-locking part 11 to the clamping part 12 along the one-way channel 2 14.

[0025] Accordingly, in order to allow the movable part to fit against the side wall of the self-locking track 10 and enter the self-locking part 11 from the one-way channel 13, rather than entering the one-way channel 2 14 and getting stuck, the bottom surface of the port of the one-way channel 13 that connects to the clamping part 12 is lower than the bottom surface of the port of the one-way channel 2 14 that connects to the clamping part 12, and the bottom surface of the clamping part 12 is smoothly connected to the bottom surface of the one-way channel 13.

[0026] Meanwhile, in order to prevent the movable end 19 of the metal folding rod 18 from disengaging from the self-locking track 10, the movable frame 2 is provided with a pre-tightening plate 21 that can elastically deform. One end of the pre-tightening plate 21 is fixed on the movable frame 2, and the other end of the pre-tightening plate 21 is a free end. This free end is located on the side of the metal folding rod 18 away from the linkage plate 7 and elastically abuts against the metal folding rod 18.

[0027] Furthermore, in order to facilitate the effective entry of the movable part into the self-locking part 11 from the one-way channel 13 and the separation of the movable part 11 into the one-way channel 24, both the one-way channel 13 and the one-way channel 24 have extreme limit points 20 that restrict the linkage plate 7 from continuing to move backward relative to the movable part. These extreme limit points 20 are located on the front side of the self-locking part 11.

[0028] In addition, in order to adjust the front and rear position of the nose pad positioning block 6 according to the actual structure of the eyeglass frame, the movable frame 2 is slidably connected to the adjustment slide plate 15 in the front and rear direction. The rear end of the nose pad positioning block 6 is provided with a tail rod 16. The rear end of the tail rod 16 is hinged and rotated on the adjustment slide plate 15. A pre-tightening spring 17 is provided between the tail rod 16 and the adjustment slide plate 15 to drive the tail rod 16 to rotate downward. When the tail rod 16 drives the nose pad positioning block 6 to rotate downward to a horizontal position, the front end of the adjustment slide plate 15 is limited and abuts against the nose pad positioning block 6.

[0029] The frame clamping part 5 can be integrated with the corresponding hinge rod. In this embodiment, the frame clamping part 5 is an abutting rubber post. The bottom surface of the abutting rubber post is provided with a insertion hole along its axis. The ends of the hinge rod 3 and the hinge rod 4 extend upward to form an insertion post that can be inserted into the insertion hole.

[0030] Furthermore, the reset elastic element 9 is a tension spring, and the rear ends of the linkage plate 7 are both equipped with reset parts 22. The two reset parts 22 are located on the left and right sides of the movable frame 2, and the reset parts 22 are connected to the corresponding sides of the movable frame 2 through the reset elastic element 9.

[0031] To improve the automation level of focimeter detection, a transverse slide rail is provided on the base 1 along the transverse direction, and the movable frame 2 is slidably fitted on the transverse slide rail. Position switches for detecting the movable frame 2 are provided on both the left and right sides of the transverse slide rail.

[0032] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A lens clamping mechanism for a focimeter, characterized in that: The device includes a base (1), on which a movable frame (2) is slidably connected laterally. Hinge rod 1 (3) and hinge rod 2 (4) are distributed crosswise and are coaxially hinged to the movable frame (2) at their middle parts. The ends of hinge rod 1 (3) and hinge rod 2 (4) are provided with a frame clamping part (5). A nose pad positioning block (6) is provided on the movable frame (2) above the intersection of hinge rod 1 (3) and hinge rod 2 (4). A linkage plate (7) is slidably connected to the movable frame (2) along the front and back. The two sides of the linkage plate (7) are respectively provided with symmetrically distributed mating rails (8). The rear ends of hinge rod 1 (3) and hinge rod 2 (4) are respectively slidably connected to the mating rails (8) on the corresponding sides. A reset elastic element (9) is provided between the movable frame (2) and the linkage plate (7) with elasticity that can drive the linkage plate (7) to move forward relative to the movable frame (2).

2. The lens clamping mechanism of a focimeter according to claim 1, characterized in that: The linkage plate (7) is provided with a self-locking track (10), and the movable frame (2) is provided with a movable part that slides on the self-locking track (10). The self-locking track (10) has a self-locking part (11) that prevents the linkage plate (7) from moving forward relative to the movable part, and a clamping part (12) located behind the self-locking part (11) and allowing the linkage plate (7) to move forward relative to the movable part. A one-way channel one (13) for the movable part to move from the clamping part (12) to the self-locking part (11) and a one-way channel two (14) for the movable part to move from the self-locking part (11) to the clamping part (12) are provided between the self-locking part (11) and the clamping part (12).

3. The lens clamping mechanism of a focimeter according to claim 1, characterized in that: The movable frame (2) is slidably connected to the adjusting slide plate (15) in the front-back direction. The rear end of the nose pad positioning block (6) is provided with a tail rod (16). The rear end of the tail rod (16) is hinged and rotated on the adjusting slide plate (15). A pre-tightening spring (17) is provided between the tail rod (16) and the adjusting slide plate (15) to drive the tail rod (16) to rotate downward. When the tail rod (16) drives the nose pad positioning block (6) to rotate downward to a horizontal position, the front end of the adjusting slide plate (15) is limited and abuts against the nose pad positioning block (6).

4. The lens clamping mechanism of a focimeter according to claim 1, characterized in that: The frame clamping part (5) is an abutting rubber post. The bottom surface of the abutting rubber post is provided with a plug hole along its axis. The ends of the first hinge rod (3) and the second hinge rod (4) extend upward to form a plug that can be inserted into the plug hole.

5. The lens clamping mechanism of a focimeter according to claim 2, characterized in that: The movable component includes a metal folding rod (18) with one end fixed to the movable frame (2). The other end of the metal folding rod (18) is a free end and is bent to form a hook-shaped or L-shaped movable end (19). The self-locking track (10) is a groove structure and is opened on one side of the metal folding rod (18). The metal folding rod (18) bends elastically toward the self-locking track (10) so that the movable end (19) of the metal folding rod (18) can be inserted and slidably fitted in the self-locking track (10). The bottom surface of the port of the one-way channel one (13) connected to the clamping part (12) is lower than the bottom surface of the port of the one-way channel two (14) connected to the clamping part (12). The bottom surface of the clamping part (12) is smoothly connected to the bottom surface of the one-way channel one (13).

6. The lens clamping mechanism of a focimeter according to claim 5, characterized in that: Both the one-way channel one (13) and the one-way channel two (14) have extreme limit points (20) that restrict the linkage plate (7) from continuing to move backward relative to the moving part. The extreme limit points (20) are located on the front side of the self-locking part (11).

7. The lens clamping mechanism of a focimeter according to claim 5, characterized in that: The movable frame (2) is provided with a pre-tightening plate (21) that can elastically deform. One end of the pre-tightening plate (21) is fixed on the movable frame (2), and the other end of the pre-tightening plate (21) is a free end. The free end is located on the side of the metal folding rod (18) away from the linkage plate (7) and elastically abuts against the metal folding rod (18).

8. The lens clamping mechanism of a focimeter according to claim 1, characterized in that: The reset elastic element (9) is a tension spring. Both sides of the rear end of the linkage plate (7) have reset parts (22). The two reset parts (22) are located on the left and right sides of the movable frame (2), and the reset parts (22) are connected to the corresponding sides of the movable frame (2) through the reset elastic element (9).

9. The lens clamping mechanism of a focimeter according to claim 1, characterized in that: The base (1) is provided with a transverse slide rail along the transverse direction. The movable frame (2) is slidably fitted on the transverse slide rail. The left and right sides of the transverse slide rail are provided with position switches for detecting the movable frame (2).

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