CN217814433U - Telescopic combined screw - Google Patents

Abstract

The utility model discloses a telescopic combination screw relates to screw technical field. The telescopic combined screw comprises a nut and a screw rod. In order to solve the problem that the existing long screw cannot be completely screwed into a shallow screw hole, so that the connection is not firm, the screw rod of the utility model is connected with the lower end of the screw cap; the screw is sequentially provided with a first smooth section, a threaded section and a second smooth section from top to bottom; the inside axial of the smooth section of second is equipped with the recess, and the recess open end corresponds and is equipped with flexible post, is equipped with the spring between recess and the flexible post. Through the utility model discloses can change screw rod length with the multiple screw degree of depth of adaptation.

Description

Telescopic combined screw

Technical Field

The utility model relates to a screw technical field particularly, relates to a telescopic combination screw.

Background

The screw, also called screw, is a tool for fastening the parts of an object step by utilizing the physics and mathematical principles of the inclined circular rotation and friction of the object. The screw is indispensable industry requisite in daily life, and the wide application is in each trade: very small screws used in cameras, glasses, clocks, electronics, etc.; general screws for televisions, electric appliances, musical instruments, furniture, and the like; large screws and nuts are used for engineering, buildings and bridges; transportation equipment, airplanes, electric cars, automobiles, and the like are used with screws of different sizes.

The rod part of the existing screw needs to be matched with the depth of the screw hole when in work, and when the length of the rod part of the screw exceeds the depth of the screw hole, the screw cannot be screwed into the screw hole completely, so that the looseness among connecting components is easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses not enough to in the background art, provide a telescopic combination screw, through the utility model discloses can change screw rod length with the multiple screw degree of depth of adaptation.

In order to achieve the above object, the technical solution of the present invention is as follows:

a telescopic combined screw comprises a screw cap and a screw rod, wherein the screw rod is connected with the lower end of the screw cap; the screw is sequentially provided with a first smooth section, a threaded section and a second smooth section from top to bottom; the inside axial of the smooth section of second is equipped with the recess, and the recess open end corresponds and is equipped with flexible post, is equipped with the spring between recess and the flexible post.

In order to make the telescopic column and the groove fit well, the invention provides another preferable scheme, the axial direction of the telescopic column and the groove is provided with a taper, and the inclination angle of the taper is 1 degree.

In order to facilitate the telescopic column to be installed in the groove, the invention provides another preferable scheme, and four rectangular notches are uniformly distributed at the opening end of the groove.

In order to enable the lower end of the screw to have pretightening force and improve the connection firmness of the screw, the invention provides another preferable scheme, wherein a spring washer and a flat washer are sleeved on the first smooth section from top to bottom;

furthermore, the spring washer is of a single-ring structure, and the upper end and the lower end of the spring washer are elastically abutted to the bottom end of the nut and the top end of the flat washer respectively.

In order to facilitate the screwing of the screw into the screw hole, the invention provides another preferable scheme that the diameter of the first smooth section is equal to that of the second smooth section, and the diameters of the first smooth section and the second smooth section are both smaller than the outer diameter of the threaded section.

In order to generate expansion force between the screw and the screw hole and ensure the firmness of connection, the invention provides another preferable scheme, the surface of the first smooth section is provided with an annular groove, and an expansion ring is arranged in the annular groove.

Furthermore, locking bulges are uniformly distributed on the bottom surface of the nut.

In order to facilitate the screwing-in and unscrewing process of the screw, the invention provides another preferable scheme that one end of the screw cap, which is far away from the screw rod, is provided with a hexagonal groove, a cross groove or a straight groove.

Generally, through the utility model discloses above technical scheme that conceive compares with prior art, can gain following beneficial effect:

1. the telescopic column is arranged at the lower end of the screw rod, so that the length of the screw rod is variable, and the screw thread can be completely screwed when the screw is screwed into a shallower screw hole, thereby ensuring the firmness of connection;

2. set up spring washer and flat washer or bloated tight ring at first smooth section, increase the fastening nature of screw connection outside threaded connection.

Drawings

FIG. 1 is a partial sectional view showing the overall structure of the present embodiment 1;

FIG. 2 is an overall structural view of the present embodiment 1;

FIG. 3 is an enlarged view of a portion A of the present embodiment 1;

FIG. 4 is an overall configuration diagram of the present embodiment 2;

FIG. 5 is a partial sectional view of the present embodiment 2;

the reference symbols in the drawings mean: 1. a nut; 2. a screw; 201. a first smooth section; 202. a threaded section; 203. a second smooth section; 3. a telescopic column; 4. a spring; 5. a spring washer; 6. a flat washer; 7. expanding and tightening rings; 8. a locking protrusion; 9. and (4) notches.

Detailed Description

The following detailed description of the present invention will be provided in conjunction with fig. 1 to 5, so as to make it clear for those skilled in the art how to practice the present invention. While the invention has been described in connection with its preferred embodiments, these embodiments are intended to be illustrative, and not to limit the scope of the invention.

Example 1

As shown in fig. 1, a retractable combination screw comprises a screw cap 1 and a screw rod 2, wherein the screw rod 2 is connected with the lower end of the screw cap 1; the screw 2 is provided with a first smooth section 201, a threaded section 202 and a second smooth section 203 from top to bottom in sequence; the inside axial of the smooth section 203 of second is equipped with the recess, and the recess open end corresponds and is equipped with flexible post 3, is equipped with spring 4 between recess and the flexible post 3.

As shown in fig. 2 and 3, the telescopic column 3 and the groove are tapered axially with an inclination angle of 1 °. Four rectangular notches 9 are uniformly distributed at the opening end of the groove.

The first smooth section 201 is sleeved with a spring washer 5 and a flat washer 6 from top to bottom; the spring washer 5 is of a single-ring structure, and the upper end and the lower end of the spring washer 5 are elastically abutted to the bottom end of the nut 1 and the top end of the flat washer 6 respectively.

With the combination screw being tightened gradually, the spring washer 5 on the first smooth segment 201 is compressed and elastically collided against the nut 1 and the flat washer 6 in the opposite direction for top buffering.

The diameter of the first smooth section is equal to that of the second smooth section, and the diameters of the first smooth section and the second smooth section are smaller than the outer diameter of the threaded section.

One end of the screw cap, which is far away from the screw rod, is provided with a hexagonal groove, a cross groove or a straight groove. The screw can be conveniently screwed into the screw hole by using the screwdriver through the groove at the top end of the screw cap.

Example 2

In addition to the structure and connection of the spring washer 5 and the flat washer 6 in example 1, the embodiment of example 2 can be selected to achieve the same effect. The differences between example 2 and example 1 are: the first smooth section surface is equipped with the annular groove, is provided with the compact ring 7 that expands in the annular groove. Meanwhile, locking protrusions 8 are uniformly distributed on the bottom surface of the nut. When the screw passes through screw thread section 202 screw in other parts, when revolving to the tight ring 7 that expands, the tight ring 7 that expands can be contracted under the effect of external pressure, after the tight ring 7 that expands is screwed in until nut 1 supports tightly with other parts, elasticity and the splendid tight ring 7 that expands of toughness can make and be connected between screw rod 2 and other parts very firmly, the fastening nature of being connected between the protruding 8 multiplicable nut 1 of locking and other parts plays skid-proof effect, very practicality.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a telescopic combination screw, includes nut and screw rod, its characterized in that: the screw is connected with the lower end of the screw cap; the screw is sequentially provided with a first smooth section, a threaded section and a second smooth section from top to bottom; the inside axial of the smooth section of second is equipped with the recess, the recess open end corresponds and is equipped with flexible post, be equipped with the spring between recess and the flexible post.

2. A retractable combination screw as in claim 1, wherein: the axial of flexible post and recess has the tapering, the angle of inclination of tapering is 1.

3. A retractable combination screw as set forth in claim 1, wherein: four rectangular notches are uniformly distributed at the opening end of the groove.

4. A retractable combination screw as set forth in claim 1, wherein: the first smooth section is sleeved with a spring washer and a flat washer from top to bottom.

5. A retractable combination screw as in claim 4, wherein: the spring washer is of a single-ring structure, and the upper end and the lower end of the spring washer are elastically abutted to the bottom end of the nut and the top end of the flat washer respectively.

6. A retractable combination screw as in claim 1, wherein: the diameter of the first smooth section is equal to that of the second smooth section, and the diameters of the first smooth section and the second smooth section are smaller than the outer diameter of the threaded section.

7. A retractable combination screw as set forth in claim 1, wherein: the first smooth section surface is equipped with the annular groove, be provided with the tight ring that expands in the annular groove.

8. A retractable combination screw as in claim 7, wherein: and locking bulges are uniformly distributed on the bottom surface of the nut.

9. A retractable combination screw as in claim 1, wherein: one end of the screw cap, which is far away from the screw rod, is provided with a hexagonal groove, a cross groove or a straight groove.

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