Double-clamping anti-loosening pressing shaft

Abstract

The utility model discloses a double-clamping anti-loosening pressing shaft. Relates to dental instruments. Comprising a mandrel sleeve, a compression spring, taper sleeve sets and double chucks, a limiting table is arranged in the mandrel sleeve, the compression spring is inserted into the mandrel sleeve, one end of the compression spring abuts against the limiting table, a movable rod is arranged in the mandrel sleeve in a sleeved mode, the taper sleeve sets are arranged in the mandrel sleeve in a sleeved mode, the movable rod penetrates through the taper sleeve sets, and the double chucks are arranged between the taper sleeve sets. The tensioning device has the effects of tensioning more and more and preventing loosening.

Description

Technical Field

[0001] The utility model relates to a dental instrument, in particular to a double-clamping anti-loosening pressing shaft. Background Art

[0002] There is a pressing shaft component inside the head of a dental high-speed handpiece, which is mainly used to fix the needle to meet normal grinding and cutting functions; sufficient clamping force ensures the normal operation of the needle and the handpiece. However, the common pressing shafts on the market currently use a single clamping method (one chuck, multiple force points), which have problems such as insufficient clamping force, low durability, and difficult processing. During use, it is easy for the needle to loosen and fly out due to insufficient clamping force or chuck wear, resulting in risks such as medical accidents; at the same time, in order to ensure the normal operation of the needle, the chuck used inside the pressing shaft has high precision requirements and needs to be processed through multiple processes to ensure that the inner and outer diameters meet the requirements and the concentricity, which is difficult to process and costly. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a double-clamping anti-loosening pressing shaft.

[0004] The utility model is implemented by the following technical scheme: a double-clamping anti-loosening pressing shaft, comprising a core shaft sleeve, a compression spring, a cone sleeve group and a double chuck, the core shaft sleeve is provided with a limit platform, the compression spring is inserted into the core shaft sleeve and one end of the compression spring abuts against the limit platform, a movable rod is sleeved in the core shaft sleeve, a cone sleeve group is sleeved in the core shaft sleeve, the movable rod passes through the cone sleeve group, and the double chuck is arranged between the cone sleeve group.

[0005] The cone sleeve group includes an upper cone sleeve and a lower cone sleeve, the lower cone sleeve is placed in the core shaft sleeve and one end of the lower cone sleeve is abutted against a compression spring, the end of the movable rod inserted into the core shaft sleeve abuts against an end of the lower cone sleeve away from the compression spring, the double chuck is inserted into the core shaft sleeve and the outer wall of the double chuck abuts against the inner wall of the movable rod, and one end of the double chuck facing the compression spring abuts against the lower cone sleeve, and the upper cone sleeve is arranged on the end of the core shaft sleeve away from the limit platform and is placed between the movable rod and the core shaft sleeve.

[0006] One end of the lower cone sleeve abutting against the double chuck is provided with a guide surface.

[0007] The movable rod includes a pressing head and a sleeve, the side wall of the sleeve is hollowed out to form a limiting plate, a limiting step is formed between the limiting plate and the sleeve, the pressing head is arranged at one end of the sleeve away from the limiting step and extends out of the core shaft sleeve, and the double chuck is sleeved in the sleeve.

[0008] The double chuck comprises a chuck sleeve, and a side of the chuck sleeve abutting against the lower cone sleeve is provided with an abutting surface, and the abutting surface abuts against the inner wall of the lower cone sleeve;

[0009] A clamping claw is provided on the side of the chuck sleeve away from the abutting surface, and the clamping claw is inserted into the sleeve. A shrinking opening is provided on the side wall of the chuck sleeve, and the shrinking opening penetrates the chuck sleeve along the axial direction of the chuck sleeve.

[0010] One end of the clamp inserted into the sleeve is provided with a contact foot, and the contact foot contacts the inner wall of the sleeve.

[0011] Compared with the prior art, the utility model is composed of at least a movable rod, an upper cone sleeve, a double chuck, a lower cone sleeve, a compression spring, and a core shaft sleeve. The two end faces of the double chuck are respectively designed with conical cylindrical pressure blocks. The double chuck is squeezed by the compression spring so that the two end faces of the double chuck contact and contract with the cone surface of the cone sleeve, and the state of contact and compression clamping with the clamping end of the needle is achieved; the double chuck is designed with a saw groove to avoid empty space, which is convenient for the two end faces to contract (similar to the chuck used in a lathe). The conical surface is consistent with the needle removal direction. In actual use, the needle is affected by external force and may generate pulling force toward the mouth. The chuck contacts the surface of the needle clamping part and moves synchronously toward the core shaft mouth under the influence of friction, increasing the contraction force of the conical surface. Through this structure, the effect of pulling tighter and tighter can be achieved to prevent loosening.

[0012] The front end of the movable rod is in contact with the lower cone sleeve, and a clearance groove is designed in the middle, so that one end of the double chuck can be sunken into the large hole of the movable rod, and the groove edge near the small hole cooperates with the chuck to open the upper end of the double chuck. The upper cone sleeve is designed with an inner cone surface, and an inner buckle groove is provided near the chuck end to assist in opening the chuck when the double chuck and the lower cone sleeve are compressed too tightly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the movable rod in the utility model;

[0015] Figure 3 This is a schematic diagram of the double chuck structure of the utility model;

[0016] In the figure: 1. upper cone sleeve; 2. double chuck; 21. chuck sleeve; 22. clamping jaw; 23. contraction mouth; 3. movable rod; 31. pressing head; 32. sleeve; 33. limiting step; 4. lower cone sleeve; 5. compression spring; 6. core shaft sleeve. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0018] like Figure 1-3As shown, a double-clamping anti-loosening pressing shaft includes a core shaft sleeve 6, a compression spring 5, a cone sleeve group and a double chuck 2. A limit platform is provided in the core shaft sleeve 6, the compression spring 5 is inserted into the core shaft sleeve 6 and one end of the compression spring 5 abuts against the limit platform, a movable rod 3 is sleeved in the core shaft sleeve 6, a cone sleeve group is sleeved in the core shaft sleeve 6, the movable rod 3 passes through the cone sleeve group, and the double chuck 2 is arranged between the cone sleeve group. The cone sleeve assembly includes an upper cone sleeve 1 and a lower cone sleeve 4. The lower cone sleeve 4 is placed in the mandrel sleeve 6 and one end of the lower cone sleeve 4 abuts against the compression spring 5. The end of the movable rod 3 inserted into the mandrel sleeve 6 abuts against the end of the lower cone sleeve 4 away from the compression spring 5. The double chuck 2 is inserted into the mandrel sleeve 6 and the outer wall of the double chuck 2 abuts against the inner wall of the movable rod 3. The end of the double chuck 2 facing the compression spring 5 abuts against the lower cone sleeve 4. The upper cone sleeve 1 is sleeved on the end of the mandrel sleeve 6 away from the limit platform and placed between the movable rod 3 and the mandrel sleeve 6. A guide surface is provided at one end of the lower cone sleeve 4 abutting against the double chuck 2. The movable rod 3 includes a pressing head 31 and a sleeve 32. The side wall of the sleeve 32 is hollowed out to form a limit plate. A limit step 33 is formed between the limit plate and the sleeve 32. The pressing head 31 is arranged at one end of the sleeve 32 away from the limit step 33 and extends out of the mandrel sleeve 6. The double chuck 2 is sleeved in the sleeve 32. The double chuck 2 includes a chuck sleeve 21, and a side of the chuck sleeve 21 that abuts against the lower cone sleeve 4 is provided with an abutting surface, and the abutting surface abuts against the inner wall of the lower cone sleeve 4. A clamping jaw 22 is provided on the side of the chuck sleeve 21 away from the abutting surface, and the clamping jaw 22 is inserted into the sleeve 32. A contraction opening 23 is provided on the side wall of the chuck sleeve 21, and the contraction opening 23 penetrates the chuck sleeve 21 along the axial direction of the chuck sleeve 21. An abutting foot is provided at one end of the clamping jaw 22 inserted into the sleeve 32, and the abutting foot abuts against the inner wall of the sleeve 32.

[0019] When in use, the pressing shaft is composed of a movable rod 3, an upper tapered sleeve 1, a double chuck 2, a lower tapered sleeve 4, a compression spring 5, and a core shaft sleeve 6. The two end surfaces of the double chuck 2 are respectively designed with conical cylindrical pressure blocks. The double chuck 2 is squeezed by the compression spring 5 so that the two end surfaces of the double chuck 2 contact and contract with the tapered surface of the tapered sleeve, thereby reaching a contact and squeeze clamping state with the clamping end of the needle. The double chuck 2 is designed with a saw groove to avoid empty space, which is convenient for the two end surfaces to contract (similar to the chuck used in a lathe). The conical surface is consistent with the needle removal direction. In actual use, the needle is affected by external force and may generate pulling force toward the mouth. The chuck contacts the surface of the needle clamping part and moves synchronously toward the core shaft mouth under the influence of friction, thereby increasing the contraction force of the conical surface. Through this structure, the effect of pulling tighter and tighter can be achieved to prevent loosening.

[0020] The front end of the movable rod 3 contacts the lower cone sleeve 4, and a clearance groove is designed in the middle, so that one end of the double chuck 2 is convenient to be sunken into the large hole of the movable rod 3, and at the same time, the groove edge of the small hole end cooperates with the chuck to open the upper end of the double chuck 2.

[0021] The upper cone sleeve 1 is designed with an inner cone surface, and an inner buckle groove is provided near the chuck end to assist in opening the clamp when the double chuck 2 and the lower cone sleeve 4 are compressed too tightly.

[0022] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A double-clamping anti-loosening pressing shaft, comprising a core shaft sleeve, a compression spring, a cone sleeve set and a double chuck, characterized in that: A limit platform is provided in the core shaft sleeve, a compression spring is inserted into the core shaft sleeve and one end of the compression spring abuts against the limit platform, a movable rod is sleeved in the core shaft sleeve, a cone sleeve group is sleeved in the core shaft sleeve, the movable rod passes through the cone sleeve group, and the double chuck is arranged between the cone sleeve groups.

2. A double-clamping anti-loosening pressing shaft according to claim 1, characterized in that: The cone sleeve group includes an upper cone sleeve and a lower cone sleeve, the lower cone sleeve is placed in the core shaft sleeve and one end of the lower cone sleeve is abutted against a compression spring, the end of the movable rod inserted into the core shaft sleeve abuts against an end of the lower cone sleeve away from the compression spring, the double chuck is inserted into the core shaft sleeve and the outer wall of the double chuck abuts against the inner wall of the movable rod, and one end of the double chuck facing the compression spring abuts against the lower cone sleeve, and the upper cone sleeve is arranged on the end of the core shaft sleeve away from the limit platform and is placed between the movable rod and the core shaft sleeve.

3. A double-clamping anti-loosening pressing shaft according to claim 2, characterized in that: One end of the lower cone sleeve abutting against the double chuck is provided with a guide surface.

4. The double-clamping anti-loosening pressing shaft according to claim 2, characterized in that: The movable rod includes a pressing head and a sleeve, the side wall of the sleeve is hollowed out to form a limiting plate, a limiting step is formed between the limiting plate and the sleeve, the pressing head is arranged at one end of the sleeve away from the limiting step and extends out of the core shaft sleeve, and the double chuck is sleeved in the sleeve.

5. The double-clamping anti-loosening pressing shaft according to claim 4, characterized in that: The double chuck comprises a chuck sleeve, and a side of the chuck sleeve abutting against the lower cone sleeve is provided with an abutting surface, and the abutting surface abuts against the inner wall of the lower cone sleeve; A clamping claw is provided on the side of the chuck sleeve away from the abutting surface, and the clamping claw is inserted into the sleeve. A shrinking opening is provided on the side wall of the chuck sleeve, and the shrinking opening penetrates the chuck sleeve along the axial direction of the chuck sleeve.

6. The double-clamping anti-loosening pressing shaft according to claim 5, characterized in that: One end of the clamping claw inserted into the sleeve is provided with an abutting foot, and the abutting foot abuts against the inner wall of the sleeve.

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