Large-diameter firearm supporting shaft gap adjusting mechanism

Abstract

The utility model discloses a large-caliber firearm supporting shaft gap adjusting mechanism which is simple in structure, convenient to adjust and reliable in fixation. Comprising a sliding seat, a supporting shaft and a locking nut, a sliding seat hole is formed in the sliding seat, the supporting shaft is provided with a polished rod section and a threaded section, the polished rod section of the supporting shaft is in clearance fit with the interior of the sliding seat hole in the sliding seat, the locking nut is matched with the threaded section of the supporting shaft, and a gap is reserved between the locking nut and the sliding seat. A plurality of rectangular grooves are evenly formed in the outer end of the locking nut in the circumferential direction, a pin hole is formed in the threaded section of the supporting shaft in the radial direction, one end of the elastic pin is arranged in the pin hole in a matched mode, the other end of the elastic pin is inserted into one rectangular groove, and the circumferential position of the locking nut is locked through the elastic pin.

Description

Technical Field

[0001] The utility model relates to the technical field of large-caliber firearm precision control, in particular to a large-caliber firearm support shaft clearance adjustment mechanism. Background Art

[0002] The support shaft of a large-caliber firearm is mainly used to realize the installation, positioning and connection of the gun body on the gun frame. Since the support shaft is fixedly connected to the slide, the size of the gap between the support shaft and the slide is directly related to the shooting accuracy and installation convenience of the firearm. Therefore, the support shaft and the slide must be able to rotate relative to each other and keep the relative gap between the two within the specified range. Usually, two mutually perpendicular through holes are processed on the tail of the support shaft screw, and at the same time, a hexagonal slot is made on the locking nut. After the nut is screwed to the approximate position, the cotter pin is inserted into the hole on the support shaft screw to solidify the position of the nut, thereby achieving gap fixation. However, due to the difficulty in ensuring the consistency of the starting point of the thread during the processing, the uncertainty of the hole position caused by the part tolerance, and the maximum limit gap generated by the design of 0.083 mm [1 (pitch) ÷ 6 (number of slots) ÷ 2 (number of holes on the screw) = 0.083], after the gap between the two meets the requirements, the hole on the screw and the slot on the locking nut are not aligned; or after the hole and slot are aligned, the gap between the slide and the support shaft cannot meet the requirements. Each time, the selection and trial matching process needs to be repeated, which is time-consuming and laborious. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a large-caliber firearm support shaft clearance adjustment mechanism, which has the advantages of simple structure, convenient adjustment and reliable fixation.

[0004] The purpose of the utility model is achieved in this way:

[0005] A large-caliber firearm support shaft clearance adjustment mechanism comprises a slide seat, a support shaft, and a locking nut. The slide seat is provided with a slide seat hole. The support shaft has a smooth rod section and a threaded section. The smooth rod section of the support shaft is clearance-fitted in the slide seat hole on the slide seat. The locking nut is fitted on the threaded section of the support shaft. A clearance is left between the locking nut and the slide seat. The mechanism also comprises an elastic pin. The outer end of the locking nut is uniformly provided with a plurality of rectangular grooves along the circumferential direction. A pin hole is radially provided on the threaded section of the support shaft. One end of the elastic pin is fitted in the pin hole. The other end of the elastic pin is inserted in a rectangular groove. The elastic pin locks the circumferential position of the locking nut.

[0006] Preferably, the locking nut is a decagon, and a rectangular groove is formed in the middle of each side of the locking nut.

[0007] Preferably, two pin hole groups are axially arranged on the threaded section of the supporting shaft, each pin hole group includes four pin holes distributed in a cross shape, and a crossing angle of 9° is formed between the two pin hole groups.

[0008] Due to the adoption of the above technical solution, the utility model is suitable for adjusting the gap between the supporting shaft and the sliding seat, and has the following beneficial effects:

[0009] The maximum theoretical clearance between the support shaft and the slide seat is reduced from 0.083 mm to 0.025 mm, which eliminates the need for selection or trial assembly, and ensures that any part can be directly installed and meets the relative clearance and rotation flexibility requirements. The assembly workload is greatly reduced and the assembly efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the exploded structure of the locking nut and the supporting shaft of the utility model;

[0011] Figure 2 It is a schematic diagram of the assembly preparation of the utility model;

[0012] Figure 3 It is a schematic diagram of the structure when the elastic pin of the utility model is installed into the second pin hole group;

[0013] Figure 4 It is a structural schematic diagram of the utility model when the elastic pin is installed into the first pin hole group.

[0014] Reference numerals

[0015] 1 is a slide seat; 2 is a supporting shaft, 201 is a first pin hole group, 202 is a second pin hole group, 203 is a bare rod section, 204 is an inner end face on the supporting shaft; 3 is a locking nut, 301 is a rectangular groove, 302 is an edge (surface) of the locking nut; 4 is an elastic pin. DETAILED DESCRIPTION

[0016] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0017] See also Figure 1-Figure 4 , is an embodiment of a support shaft clearance adjustment mechanism for a large-caliber firearm, comprising a slide 1, a support shaft 2, a locking nut 3, a pressure cover and a tightener on the support shaft (existing structure, not shown in the figure), a slide hole is provided on the slide 1, the support shaft 2 has a bare rod section and a threaded section, the bare rod section of the support shaft 2 is gap-fitted in the slide hole on the slide 1, and the locking nut 3 is fitted on the threaded section of the support shaft 2, characterized in that: a gap is left between the locking nut 3 and the slide 1, and also includes an elastic pin 4, the outer end of the locking nut 3 is evenly provided with a plurality of rectangular grooves along the circumferential direction, a pin hole is radially provided on the threaded section of the support shaft 2, one end of the elastic pin 4 is fixed in the pin hole by elastic tight fit, and the other end of the elastic pin 4 is fixed by elastic insertion in a rectangular groove, and the elastic pin 4 locks the circumferential position of the locking nut 3.

[0018] The locking nut 3 is a decagon, and a rectangular groove 301 is respectively formed in the middle of each side of the locking nut 3. Two pin hole groups are axially arranged on the threaded section of the supporting shaft 2: a first pin hole group 201 and a second pin hole group 202, each of which includes four pin holes distributed in a cross shape (the connecting lines are perpendicular to each other), and the intersection angle between the two pin hole groups is 9°.

[0019] Assembly method:

[0020] After the bare rod section 203 of the support shaft 2 is installed into the slide seat hole on the slide seat 1, the threaded section is then installed with the locking nut 3, and the inner end surface 204 of the support shaft 2 and the inner surface of the slide seat 1 are rotated to achieve a specified clearance range, and then the rectangular groove 301 on the locking nut 3 and the pin hole on the support shaft are judged to be aligned. If they are not aligned, the locking nut 3 can be relatively rotated to achieve alignment. Then the elastic pin 4 is installed in the corresponding pin hole.

[0021] The utility model realizes that the locking nut has up to 40 different fixing holes for each rotation of the supporting shaft. After the locking nut is positioned on the supporting shaft screw, it is locked by an elastic pin, and has a beautiful appearance and can be reused. When the supporting shaft is installed on the slide seat, the locking nut is rotated to a suitable position to ensure the clearance between the end face of the supporting shaft and the end face of the slide seat and the rotation flexibility requirements, and then the locking nut is locked on the supporting shaft to prevent rotation by the elastic pin.

[0022] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A large-caliber firearm support shaft clearance adjustment mechanism, comprising a slide seat, a support shaft, and a locking nut, wherein the slide seat is provided with a slide seat hole, the support shaft has a polished rod section and a threaded section, the polished rod section of the support shaft is clearance-fitted in the slide seat hole on the slide seat, and the locking nut is fitted on the threaded section of the support shaft, characterized in that: A gap is left between the locking nut and the sliding seat, which also includes an elastic pin. The outer end of the locking nut is evenly provided with a plurality of rectangular grooves along the circumference, and a pin hole is radially provided on the threaded section of the supporting shaft. One end of the elastic pin fits in the pin hole, and the other end of the elastic pin is inserted in a rectangular groove. The elastic pin locks the circumferential position of the locking nut.

2. A large-caliber firearm support shaft clearance adjustment mechanism according to claim 1, characterized in that: The locking nut is a decagon, and a rectangular groove is respectively opened in the middle of each side of the locking nut.

3. A large-caliber firearm support shaft clearance adjustment mechanism according to claim 1 or 2, characterized in that: Two pin hole groups are axially arranged on the threaded section of the supporting shaft, each pin hole group includes four pin holes distributed in a cross shape, and a crossing angle of 9° is formed between the two pin hole groups.

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