Small pinion rack focuser with nosepiece interface

Abstract

The utility model discloses a small gear and rack focusing device with intubation interface, which is composed of a base, a focusing seat and a focusing cylinder. A through hole is arranged in the middle of the base, and a gear shaft passes through the through hole. A focusing hand wheel is arranged at the two ends of the gear shaft. The lower part of the focusing seat is connected with the base, and the focusing cylinder is arranged inside. Two tiles and a PTFE gasket are arranged on the contact surface between the upper part of the focusing seat and the focusing cylinder. The tiles are adjusted by limiting screws, and the PTFE gasket is adjusted by hand screws. A connecting thread and a C ring are arranged at the rear end of the focusing cylinder. The C ring is pressed by a knurled head screw. A rack is arranged at the lower part of the focusing cylinder, and the rack is matched with the gear shaft. The rear end of the focusing device can be connected by thread cooperation or directly inserted into the intubation. The user can conveniently adjust the small telescope by the hand wheel, and the experience is optimized.

Description

Technical Field

[0001] This utility model relates to the field of astronomical telescopes, and in particular to a small gear rack focusing device with a tube interface. Background Technology

[0002] In the focusing structure of astronomical telescopes, most 1.25-inch focusing mechanisms utilize a double-helix structure. Most focusing mechanisms of this size are either single-helix or double-helix. Since the helix structure coincides with the axis of the astronomical telescope, it is inconvenient to add an extra small handwheel for focusing, which makes it impossible for users to use the handwheel for focusing. Summary of the Invention

[0003] To address the aforementioned problems, this utility model provides a small gear and rack focusing device with a tube interface, comprising a base, a focusing seat, and a focusing cylinder. The base has a through hole in the middle, through which a gear shaft passes, and focusing handwheels are located at both ends of the gear shaft. The lower part of the focusing seat is connected to the base, and a focusing cylinder is housed inside. Two tiles and a PTFE gasket are located on the upper part of the focusing seat in contact with the focusing cylinder. The tiles are adjusted by limit screws, and the PTFE gaskets are adjusted by hand-tightening screws. The rear end of the focusing cylinder has a connecting thread and a C-ring, which is held in place by a knurled small-head screw. A rack is located at the lower part of the focusing cylinder, and the rack engages with the gear shaft. The focusing handwheel is fixed to the gear shaft by a set screw, and the base is fixed to the focusing seat by a cylindrical head screw and a spring washer. The rack and pinion engage with the gear shaft. Rotating the focusing handwheel controls the forward and backward movement of the focusing tube. The limit screw adjusts the tightness of the tiles to prevent the focusing tube from tilting up or down under gravity. It also engages with the protrusion at the front end of the focusing tube to limit the maximum movement of the focusing tube. The hand-tightened screw and PTFE washer brake the focusing tube to prevent it from sliding back and forth in the focusing seat due to gravity.

[0004] Furthermore, an adapter ring is provided at the front end of the focusing mount.

[0005] Furthermore, bearings are installed at both ends of the through hole in the middle of the base, and the gear shaft is connected to the base through the bearings.

[0006] The above-mentioned technical solution of this utility model has the following beneficial technical effects: The rear end of the focusing device can be connected by threaded connection or direct insertion of a tube, which makes it convenient for users to adjust the small telescope by handwheel, thus optimizing the user experience. The gear shaft axis of the rack and pinion focusing device is perpendicular to the axis of the astronomical telescope, and the lateral space facilitates the addition of a handwheel for focusing. Compared with the screw structure focusing, the handwheel focusing is smoother, more precise, and has higher accuracy. Attached Figure Description

[0007] Figure 1 This is a front view of a small gear and rack focusing device with a tube interface;

[0008] Figure 2 This is a top view of a small gear and rack focusing device with a tube interface;

[0009] Figure 3 This is a left view of a small rack and pinion focusing device with a tube interface;

[0010] Figure 4 It is an AA cross-sectional view of a small gear rack focusing device with a tube insertion interface;

[0011] Figure 5 This is a BB cross-sectional view of a small gear rack focusing device with a tube insertion interface.

[0012] Figure label:

[0013] 1: Base; 2: Focusing base; 3: Focusing cylinder; 4: Gear shaft; 5: Rack; 6: PTFE gasket; 7: Cylindrical head screw; 8: Flat round head screw; 9: Set screw; 10: Set screw; 11: Knurled small head screw; 12: C-ring; 13: Limit screw; 14: Adapter ring; 15: Hand screw; 16: Tile; 17: Focusing handwheel; 18: Bearing; 19: Spring washer; 20: Elastic retaining ring. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0015] like Figure 1-5As shown, a small gear and rack focusing device with a tube interface is provided, which consists of a base 1, a focusing seat 2, and a focusing cylinder 3. The base 1 has a through hole in the middle, through which a gear shaft 4 passes. A focusing handwheel 17 is provided at both ends of the gear shaft 4. The lower part of the focusing seat 2 is connected to the base 1, and the focusing cylinder 3 is provided inside. Two tiles 16 and a PTFE gasket 6 are provided on the upper part of the focusing seat 2 in contact with the focusing cylinder 3. The tiles 16 are adjusted by a limiting screw 13, and the PTFE gasket 6 is adjusted by a hand-tightening screw 15. The rear end of the focusing cylinder 3 is provided with a connecting thread and a C-ring 12. The C-ring 12 is held in place by a knurled small-head screw 11. A rack 5 is provided at the lower part of the focusing cylinder 3, and the rack 5 cooperates with the gear shaft 4. The focusing handwheel 17 is fixed to the gear shaft 4 by the set screw 10. The base 1 is fixed to the focusing seat 2 by the cylindrical head screw 7 and the spring washer 19. The rack 5 is fixed to the focusing cylinder 3 by the flat round head screw 8. The rack 5 cooperates with the gear shaft 4. The forward and backward movement of the focusing cylinder 3 is controlled by rotating the focusing handwheel 17. The limit screw 13 adjusts the tightness of the tile 16 to prevent the focusing cylinder 3 from tilting up or drooping under the action of gravity. It also cooperates with the protrusion at the front end of the focusing cylinder 3 to limit the maximum movement position of the focusing cylinder 3. The hand screw 15 and the PTFE washer 6 brake the focusing cylinder 3 to prevent the focusing cylinder 3 from sliding back and forth in the focusing seat 2 due to gravity.

[0016] An adapter ring 14 is provided at the front end of the focusing mount 2. The adapter ring 14 is fixed to the focusing mount 2 by a set screw 9.

[0017] Bearings 18 are installed at both ends of the through hole in the middle of the base 1, and the gear shaft 4 is connected to the base 1 through the bearings 18. Elastic retaining rings 20 are installed at both ends of the bearings 18.

[0018] The rear end of the focusing tube 3 has an internal 1.25-inch C-ring 4 and an M42x0.75 thread, and the front end of the focusing device has an M35 adapter ring 14. The front end of the M35 adapter ring 14 has an M35x0.5 thread, so that the connection method of the focusing device is either the front end M35x0.5 thread engagement and the rear end M42x0.75 thread engagement, or the 1.25-inch tube is inserted and the 1.25-inch C-ring 12 is locked with a knurled small head screw 11.

[0019] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A small gear and rack focusing device with a tube insertion interface, characterized in that, It consists of a base, a focusing seat, and a focusing cylinder. The base has a through hole in the middle, through which a gear shaft passes. Focusing handwheels are located at both ends of the gear shaft. The lower part of the focusing seat is connected to the base, and a focusing cylinder is installed inside. Two tiles and a PTFE gasket are installed on the upper part of the focusing seat in contact with the focusing cylinder. The tiles are adjusted by a limit screw, and the PTFE gasket is adjusted by a hand-tightening screw. The rear end of the focusing cylinder has a connecting thread and a C-ring. The C-ring is held in place by a knurled small-head screw. A rack is installed at the lower part of the focusing cylinder, and the rack engages with the gear shaft.

2. The miniature gear and rack focusing device with a tube interface according to claim 1, characterized in that, An adapter ring is provided at the front end of the focusing mount.

3. The miniature gear and rack focusing device with a tube insertion interface according to claim 1, characterized in that, Bearings are provided at both ends of the through hole in the middle of the base, and the gear shaft is connected to the base through the bearings.

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