CN112617744A

CN112617744A - Freely-adjusted refractometer projection plate

Info

Publication number: CN112617744A
Application number: CN202011347914.7A
Authority: CN
Inventors: 蔡晓云; 王勤勇; 陈坚强
Original assignee: Jiangsu Aishangmei Glasses Co ltd
Current assignee: Jiangsu Aishangmei Glasses Co ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-04-09
Anticipated expiration: 2040-11-26
Also published as: CN112617744B

Abstract

The invention provides a freely-adjustable projection plate of an optometry instrument, which comprises a base, a telescopic rod, a projection plate and a movable joint, wherein the base is provided with a plurality of telescopic rods; the telescopic rod is vertically fixed on the base, the projection plate is provided with a connecting rod, the movable joint is provided with two connecting parts which are relatively movable, one connecting part is connected with one end of the telescopic rod, and the other connecting part is connected with the connecting rod of the projection plate; the movable joint comprises a joint shell which is also used as one connecting part, a worm wheel, a worm, a driving shaft and a movable part which is also used as the other connecting part; the worm wheel and the worm are mutually meshed and arranged in the joint shell, and at least one end part of the worm is exposed out of the joint shell and is provided with an anti-torsion structure; one end of the driving shaft extends into the joint shell to form anti-torsion connection with the worm wheel, and the other end of the driving shaft is positioned outside the joint shell to form anti-torsion connection with the moving piece. The invention can freely adjust the position of the projection plate through the movable joint, thereby greatly improving the operability and convenience of the projection plate.

Description

Freely-adjusted refractometer projection plate

Technical Field

The invention belongs to the technical field of optometry processing, and particularly relates to a freely-adjusted projection plate of an optometry instrument.

Background

The projection plate of the optometry instrument is an auxiliary instrument required by optometry lens matching. The existing projection board is supported by an elongated upright at a certain height from the ground, so that the base is generally weighted to be more stable in order to avoid the projection board from falling. However, the consequence of this is that when the projection board needs to be moved for use, the situation of inconvenient movement exists, and the use of the projection board is limited.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the freely-adjusted projection plate of the optometry instrument achieves the purpose of freely moving the projection plate on the premise of not changing the position of the base through the movable joint, and has better operability and convenience.

The invention is realized by the following steps: a freely adjustable projection plate of an optometry instrument comprises a base, a telescopic rod, a projection plate and a movable joint; the telescopic rod is vertically fixed on the base, the projection plate is provided with a connecting rod, the movable joint is provided with two connecting parts which are movable relatively, one connecting part is connected with one end of the telescopic rod, and the other connecting part is connected with the connecting rod of the projection plate;

the movable joint comprises a joint shell, a worm wheel, a worm, a driving shaft and a movable piece, wherein the joint shell is also used as one connecting part, and the movable piece is also used as the other connecting part;

the worm wheel and the worm are arranged in the joint shell in an intermeshing manner, and at least one end of the worm is exposed out of the joint shell and is provided with an anti-torsion structure; one end of the driving shaft extends into the joint shell to form anti-torsion connection with the worm wheel, and the other end of the driving shaft is positioned outside the joint shell to form anti-torsion connection with the moving piece.

Further, the joint housing comprises a middle housing, a first end cap and a second end cap; the middle shell is provided with a first accommodating part and a second accommodating part which are communicated with each other, and both ends of the first accommodating part and the second accommodating part form openings on the middle shell; the first end cover and the second end cover are respectively arranged at openings at two ends of the second accommodating part; the worm wheel is installed in the second accommodating part, and the worm is installed in the first accommodating part.

Further, the first end cover is provided with a first rotating connecting portion, and the movable piece is provided with a second rotating connecting portion capable of forming rotating connection with the first rotating connecting portion.

Furthermore, a limiting groove is coaxially arranged on the outer circular surface of the first rotating connecting part, and a limiting pin is arranged on the outer circular surface of the second rotating connecting part; the limiting pin is connected with the limiting groove in a matched mode, so that the movable piece and the first end cover form axial limiting.

Furthermore, the surface of first end cover is provided with the scale mark, the moving part is provided with the pointer.

Further, the driving shaft has a first axial position and a second axial position, and when the driving shaft is located at the first axial position, the driving shaft forms a torsion-resistant connection with the worm wheel and the movable piece;

when the driving shaft is located at the second axial position, the driving shaft is in rotating connection with at least one of the worm wheel and the movable piece.

Further, the drive shaft has a first spline shaft and a second spline shaft, the movable member has a first spline hole that matches the first spline shaft, and the wheel shaft of the worm wheel has a second spline hole that matches the second spline shaft.

Further, a spring which enables the driving shaft to have the moving trend from the second axial position to the first axial position is arranged between the driving shaft and the worm wheel.

Further, the drive shaft has a receiving hole receiving one end of the spring.

Further, the driving shaft is provided with a limiting platform used for limiting the driving shaft to be separated from the movable piece.

The invention has the following beneficial effects:

1. the invention can freely adjust the position of the projection plate through the movable joint, has a self-locking function, prevents the projection plate from automatically aligning, and greatly improves the operability and convenience of the projection plate.

2. The movable joint realizes transmission locking and transmission releasing by utilizing the axial movement of the driving shaft, thereby meeting the requirements of quick resetting and large-angle adjustment of the movable joint and ensuring that the operation is more convenient.

Drawings

FIG. 1 is a perspective view of a preferred embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged view of a portion of FIG. 1 at B;

FIG. 4 is an exploded view of the embodiment of FIG. 1;

FIG. 5 is a front elevational view of the movable joint of the embodiment of FIG. 1;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5 (with the drive shaft in a first axial position);

FIG. 7 is a sectional view taken along line B-B of FIG. 6;

fig. 8 is a cross-sectional view of the corresponding drive shaft of fig. 6 in a second axial position.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 7, the freely adjustable projection plate of the optometry instrument comprises a base 3, a telescopic rod, a projection plate 5 and a movable joint 18. The telescopic rod is vertically fixed on the base 3, the projection plate 5 is provided with a connecting rod 51, the movable joint 18 is provided with two connecting parts which are movable relatively, one of the connecting parts is connected with one end of the telescopic rod, and the other connecting part is connected with the connecting rod 51 of the projection plate 5.

The movable joint 18 includes a joint housing doubling as one of the connecting portions, a worm wheel 15, a worm 19, a drive shaft 9, and a movable piece 8 doubling as the other connecting portion. The worm wheel 15 and the worm 19 are mounted in a mutually engaging manner in the joint housing, wherein one end of the wheel shaft 152 of the worm wheel 15 is rotatably mounted in the joint housing via the first bearing 14 and the other end is rotatably mounted in the joint housing via the second bearing 16. The worm 19 is rotatably mounted in the joint housing in the same way.

It should be noted that, in the embodiment, the projection plate of the optometry apparatus is provided with one movable joint, but as can be seen from the structure and principle of the projection plate, a plurality of movable joints can be connected in series to form a structure similar to a mechanical arm in order to increase the degree of freedom, so that the requirement of multi-degree-of-freedom movement is met, and the space operability is improved.

In order to drive the worm 19 in rotation, at least one end of the worm 19 is exposed to the joint housing and provided with a torsion-resistant structure. Preferably, both ends of the worm 19 are exposed out of the joint housing and are provided with anti-torsion structures, and the anti-torsion structures are hexagon socket holes, so that the worm can be manually rotated by matching with a hexagon socket wrench, and can also be electrically rotated by matching with a hexagon socket head of an electric screwdriver. Similarly, the anti-rotation structure may be an external hexagonal post that rotates with a wrench and a power tool. One end of the driving shaft 9 extends into the joint shell to form anti-torsion connection with the worm wheel 15, and the other end is positioned outside the joint shell to form anti-torsion connection with the movable piece 8. After the worm 19 is rotated, the worm wheel 15 also rotates along with the worm, so that the movable piece 8 is driven to rotate, the movement of the projection plate 5 is finally realized, the position of the projection plate 5 can be changed by matching with the adjustment of the telescopic rod, and in the process, the position of the base 3 is kept still, so that the integral movement is avoided.

As shown in 3, further, the telescopic link includes dead lever 2 and movable rod 1, and movable rod 1 is the hollow tube, and the setting of 1 part of movable rod forms swing joint in movable rod 1, realizes the adjustment of length and angle. The position that is close to the bottom on the movable rod 1 is provided with the inside nut of intercommunication, installs adjust knob 4 on the nut, makes its pole portion withstand the dead lever 2 or leave dead lever 2 through rotatory adjust knob 4 to form fixed connection or swing joint between messenger's movable rod 1 and the dead lever 2.

As shown in fig. 4, further, the joint housing includes a middle housing 7, a first end cap 6, and a second end cap 17; the intermediate housing 7 has a first receiving portion 71 and a second receiving portion 73 that communicate with each other, and both ends of each of the first receiving portion 71 and the second receiving portion 73 are open in the intermediate housing 7. The first end cap 6 and the second end cap 17 are respectively mounted at openings at two ends of the second receiving portion 73 through a plurality of screws 12, the first end cap 6 is provided with a first countersunk hole 62 for mounting the screw 12, and the second end cap 17 is provided with a second countersunk hole 171 for mounting the screw 12. The worm wheel 15 is mounted in the second housing portion 73, and the worm is mounted in the first housing portion 71.

As shown in fig. 4 and 6, in order to further enable the movable member 8 to rotate more firmly on the outer side of the first end cap 6, a sliding connection is formed between the two. The first end cap 6 has a first rotation connecting portion 63, the first rotation connecting portion 63 is a rotation body having one axis as a rotation axis, and the movable element 8 has a second rotation connecting portion 83 capable of forming a rotation connection with the first rotation connecting portion 63. The second rotation connecting portions 83 are respectively provided on both the inner and outer sides of the first rotation connecting portion 63 and are slidably connected thereto via sliding surfaces.

As shown in fig. 4 and 6, further, the outer circumferential surface of the first rotation connecting portion 63 is coaxially provided with a limiting groove 64, and the outer circumferential surface of the second rotation connecting portion 83 is mounted with a limiting pin 10; the limit pin 10 is coupled with the limit groove 64 to axially limit the movable member 8 and the first end cap 6. The stopper pin 10 is threadedly mounted on the second rotation connecting portion 83, so that the movable member 8 and the first end cap 6 can be detachably mounted.

As shown in fig. 5, further, the surface of the first end cap 6 is provided with scale marks 61, and the movable member 8 is provided with a pointer 82. The rotation angle of the movable part 8 can be determined by the pointer 82 and the graduation mark 61, which facilitates flexible adjustment.

As shown in fig. 6 and 8, further, the driving shaft 9 has a first axial position and a second axial position, and when the driving shaft 9 is located at the first axial position, the driving shaft 9 forms a torque-proof connection with both the worm wheel 15 and the movable member 8. At this time, a transmission connection is established between the worm 19 and the movable member 8, and the movable member 8 can be driven to rotate relative to the joint housing by rotating the worm 19. When the driving shaft 9 is at the first axial position, one end of the driving shaft protrudes from the surface of the movable member 8, so as to form a pressing portion for pressing a finger. When the drive shaft 9 is moved inward by finger pressure to a second axial position, the pressing portion is fully retracted into the central bore of the movable member 8.

When the drive shaft 9 is in the second axial position, the drive shaft 9 is in rotational connection with at least one of the worm wheel 15 and the movable member 8. At this time, the transmission connection between the worm 19 and the movable member 8 is released, and the movable member 8 cannot be driven to rotate relative to the joint housing by rotating the worm 19. But the movable part 8 can be directly rotated to rotate relative to the joint shell, and the quick resetting and large-angle adjustment of the movable part 8 can be realized in the state.

As shown in fig. 4, further, the drive shaft 9 has a first spline shaft 91 and a second spline shaft 92, the movable piece 8 has a first spline hole 81 matching the first spline shaft 91, and the axle 152 of the worm wheel 15 has a second spline hole 151 matching the second spline shaft 92. When the drive shaft 9 is in the first axial position, the first splined shaft 91 and the first splined bore 81 form a torque-proof connection and the second splined shaft 92 and the second splined bore 151 form a torque-proof connection. As shown in fig. 8, when the driving shaft 9 is in the second axial position, the second spline shaft 92 and the second spline hole 151 are still connected in a torque-proof manner, but the torque-proof connection between the first spline shaft 91 and the first spline hole 81 is released, and the driving member 9 cannot drive the movable member 8.

As shown in fig. 6 and 8, further, a spring 13 is provided between the driving shaft 9 and the worm wheel 15, which makes the driving shaft 9 have a tendency to move from the second axial position to the first axial position. When the force pressing the drive shaft 9 is removed, the drive shaft 9 will be returned from the second axial position to the first axial position by the spring 13.

As shown in fig. 6 and 8, the drive shaft 9 has a receiving hole 94 that receives one end of the spring 13.

As shown in fig. 6 and 8, the drive shaft 9 has a stopper 93 for restricting the drive shaft 9 from coming off the movable piece 8.

It should be noted that, the components disclosed in the present invention are provided with corresponding holes according to the installation requirements to meet the installation requirements of the components, and the arrangement of the holes is a conventional means, and therefore, the details are not repeated. The placement and type of these holes can be known to those skilled in the art with the intent of this invention and are considered to be implicitly disclosed.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A freely adjustable projection plate of an optometry instrument is characterized by comprising a base (3), a telescopic rod, a projection plate (5) and a movable joint (18); the telescopic rod is vertically fixed on the base (3), the projection plate (5) is provided with a connecting rod (51), the movable joint (18) is provided with two relatively movable connecting parts, one of the connecting parts is connected with one end of the telescopic rod, and the other connecting part is connected with the connecting rod (51) of the projection plate (5);

the movable joint (18) comprises a joint shell which is also used as one connecting part, a worm wheel (15), a worm (19), a driving shaft (9) and a movable part (8) which is also used as the other connecting part;

the worm wheel (15) and the worm (19) are mounted in the joint shell in a mutually meshed mode, at least one end portion of the worm (19) is exposed out of the joint shell and is provided with a torsion-resistant structure; one end of the driving shaft (9) extends into the joint shell to form anti-torsion connection with the worm wheel (15), and the other end of the driving shaft is positioned outside the joint shell to form anti-torsion connection with the moving piece (8).

2. A freely adjustable refractometer projection plate according to claim 1, wherein said articulated housing comprises an intermediate housing (7), a first end cap (6) and a second end cap (17); the middle shell (7) is provided with a first accommodating part (71) and a second accommodating part (73) which are communicated with each other, and both ends of the first accommodating part (71) and the second accommodating part (73) form openings on the middle shell (7); the first end cover (6) and the second end cover (17) are respectively arranged at openings at two ends of the second accommodating part (73); the worm wheel (15) is mounted in the second accommodating portion (73), and the worm is mounted in the first accommodating portion (71).

3. A freely adjustable refractometer projection plate according to claim 2, wherein said first end cap (6) has a first rotary connection (63), and said movable member (8) has a second rotary connection (83) capable of forming a rotary connection with said first rotary connection (63).

4. A freely adjustable projection plate of an optometry instrument according to claim 3, wherein the first rotation connecting part (63) is coaxially provided with a limiting groove (64) on the outer circumferential surface thereof, and the second rotation connecting part (83) is provided with a limiting pin (10) on the outer circumferential surface thereof; the limiting pin (10) is connected with the limiting groove (64) in a matched mode, so that the movable piece (8) and the first end cover (6) form axial limiting.

5. A freely adjustable refractometer projection plate according to claim 2, wherein the surface of said first end cap (6) is provided with graduation marks (61) and said movable member (8) is provided with a pointer (82).

6. A freely adjustable refractometer projection plate according to claim 1, wherein said drive shaft (9) has a first axial position and a second axial position, and when said drive shaft (9) is in said first axial position, said drive shaft (9) forms a non-rotatable connection with both said worm gear (15) and said movable member (8);

when the driving shaft (9) is located at the second axial position, the driving shaft (9) is in rotary connection with at least one of the worm wheel (15) and the movable piece (8).

7. A freely adjustable refractometer projection plate according to claim 6, characterized in that the drive shaft (9) has a first splined shaft (91) and a second splined shaft (92), the movable member (8) has a first splined hole (81) matching the first splined shaft (91), and the axle (152) of the worm gear (15) has a second splined hole (151) matching the second splined shaft (92).

8. A freely adjustable refractometer projection plate according to claim 6, characterized in that a spring (13) is also provided between the drive shaft (9) and the worm gear (15) which gives the drive shaft (9) a tendency to move from the second axial position to the first axial position.

9. A freely adjustable refractometer projection plate according to claim 8, wherein said drive shaft (9) has a receiving hole (94) for receiving one end of said spring (13).

10. A freely adjustable refractometer projection plate according to claim 6, wherein said drive shaft (9) has a stop (93) for limiting the disengagement of said drive shaft (9) from said movable member (8).