CN204175749U - A kind of captive screw of fast demountable - Google Patents

Abstract

The utility model discloses a fast detachable captive screw, which comprises: a press-fit screw sleeve, a screw, a spring and a hand-twist ring; The knurled part is press-fitted into the opening of the connected piece, the spring is set on the screw, and the screw is screwed into the press-fit screw sleeve. There is a hand-twist ring installation hole on the screw head, and the hand-twist ring passes through the Mounting holes connect with screw heads. The utility model has beneficial effects: the screw head of the screw captive screw of the utility model is equipped with a hand-twist ring, which can tighten the screw without using tools; the cross notch on the end face of the screw head can be installed with a cross screwdriver, You can also use a flat-blade screwdriver for installation, which is convenient for operation.

Description

A fast detachable captive screw

technical field

The utility model relates to a fast detachable captive screw.

Background technique

Currently, the existing captive screws are generally used on the panels of sub-boxes, and most of the captive screws used in these devices require tools to be tightened or disassembled. For large-scale equipment repair and modification sites, work efficiency may be affected due to the lack of disassembly tools. For occasional individual equipment inspections, it is more hoped that the equipment can be quickly disassembled without tools to facilitate operation and improve efficiency.

Utility model content

The purpose of this utility model is exactly in order to solve the above-mentioned problem, has proposed a kind of fast detachable captive screw, this screw has the advantages of simple disassembly, firm installation, not easy to fall off.

In order to achieve the above object, the utility model adopts the following technical solutions:

A captive screw that can be quickly disassembled and assembled, including: a press-fit screw sleeve, a screw, a spring and a hand-tightening ring; the press-fit screw sleeve is fixed in the corresponding opening of the connected part, and the spring is covered Above, the bottom end of the screw is screwed into the press-fit screw sleeve, the screw head is provided with a hand-twist ring installation hole, and the hand-twist ring is connected to the screw head through the hand-twist ring installation hole.

There is a cross notch on the end surface of the screw head for the operation of the Phillips screwdriver; one side of the cross notch runs through the end face of the screw head and is used for the operation of the flat screwdriver.

The outer circle part of the screw head is provided with straight lines or net knurling.

The bottom of the press-fit screw sleeve is provided with straight-grain knurling, and the straight-grain knurled part is press-fitted into the corresponding opening of the connected part.

The outer diameter of the straight knurl at the bottom of the press-fit screw sleeve is larger than the diameter of the through hole connected with the press-fit screw sleeve on the connected piece.

The beneficial effects of the utility model are:

In the utility model, the captive screw is screwed into and pressed into the screw sleeve of the connected part so that the screw will not fall off from the connected part; the cross notch on the end face of the screw head can be installed with a cross screwdriver or a flat screwdriver. screwdriver for installation.

A spring is inserted on the screw, and when the connected part is installed with another structural part, the spring is in a compressed state, which can prevent loosening when the screw is tightened.

The knurled setting on the outer circle of the screw head can facilitate the hand-tightening operation without tools; in the case of installation without tools and high tightening torque requirements, the screw can be tightened by hand-tightening rings. To increase the torque and tighten the role.

Description of drawings

Fig. 1 is the schematic diagram of the structure of the utility model captive screw;

Fig. 2 is a schematic diagram of installation of the utility model screw sleeve;

Fig. 3 is a schematic diagram of the connection between the captive screw and the connector of the present invention.

Among them, 1. Press-fit screw sleeve, 2. Screw, 3. Spring, 4. Hand-twist ring, 5. Connected part 1, 6. Connected part 2, 1-1. Screw sleeve straight knurled, 1- 2. Spring guide groove, 1-3. Thread, 2-1. Cross-shaped opening, 2-2. Straight or knurled screw head, 2-3. Mounting hole for hand-twist lifting ring.

Detailed ways

The utility model is further limited below in conjunction with accompanying drawing and specific embodiment.

A fast detachable captive screw, as shown in Figure 1 and Figure 2, comprising: a press-fit screw sleeve, a screw, a spring and a hand-tightened ring; the bottom of the press-fit screw sleeve is provided with straight knurling, The straight-grain knurled part is press-fitted into the opening of the connected part, the spring is set on the screw, and the screw is screwed into the press-fit screw sleeve, and the screw head is provided with a hand-twist ring installation hole, and the hand-twist ring Connect with the screw head through the installation hole of the hand-twist ring.

There is a cross notch on the end face of the screw head for the operation of the Phillips screwdriver; one side of the cross notch runs through the end face of the screw head and is used for the operation of the flat screwdriver. The outer circle of the screw head is provided with straight grain or net grain knurling. The outer diameter of the straight knurl at the bottom of the press-fit screw sleeve is slightly larger than the diameter of the through hole where the screw sleeve is installed on the connected piece.

The captive screw consists of four parts, which are assembled together before use. When in use, make a through hole with a diameter of D on the connected part, and the diameter D is slightly smaller than the outer diameter 1-d of the straight knurl of the threaded sleeve (for example, when the connected part is made of aluminum alloy, and the outer diameter of the knurled is 1 When -d is less than 10mm, the size of D can be 0.1mm smaller than 1-d). Then press-fit the knurled part of the screw sleeve into the opening of the connected part, as shown in Figure 2. After the screw sleeve is pressed in, the spring 3 is set on the screw, and then the screw 2 is screwed into the screw sleeve pressed on the connected part. Due to the existence of the screw thread, the screw will not fall off from the connected part. Because of the existence of the spring, when the connected part is installed with another structural part, the spring is in a compressed state to prevent loosening.

There is a cross notch on the end surface of the head of the screw 2, and one side of the cross notch is longer, so a cross screwdriver or a flat-head screwdriver can be used for installation. The outer circle of the screw head has straight lines or textured knurling 2-2, which is convenient for hand-tightening operation without tools. The hand-twist suspension ring 4 is installed in the opening 2-3 of the screw. The function of the hand-twist lifting ring is to tighten the screw when there is no tool for installation and the tightening torque is required to be high, so as to amplify the torque and tighten the screw.

Fig. 3 has provided the usage example of the present utility model. The captive screw is first installed on the connected part-5 by the press-fit screw sleeve 1. There are threaded holes on the connected 2. When the connected part 1 needs to be installed, other installation tools can be used, and the captive screw can be directly tightened into the threaded hole of the connected part 2 6 with the hand-tightening ring 4 on the captive screw, so as to realize being connected. The fixing operation of the first connecting piece 5 and the second connected piece 6.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (5)

1. a captive screw for fast demountable, is characterized in that, comprising: press-fit swivel nut, screw, spring and hand and twist suspension ring; Describedly press-fit swivel nut and be fixed in the corresponding aperture of connected piece, described spring housing is on screw, and described screw bottom screws in and press-fits in swivel nut, screw head is arranged hand and twists suspension ring mounting hole, and hand is twisted suspension ring and twisted suspension ring mounting hole by described hand and be connected with screw head.

2. the captive screw of a kind of fast demountable as claimed in claim 1, is characterized in that, described screw head end face has cross breach, for the operation of Phillips screwdriver; Screw head end face is run through, for the operation of slotted point screwdriver in a limit of described cross breach.

3. the captive screw of a kind of fast demountable as claimed in claim 1, is characterized in that, described screw head excircle part is provided with straight burr or hatching knurling.

4. the captive screw of a kind of fast demountable as claimed in claim 1, is characterized in that, described in press-fit bottom swivel nut and be provided with straight knurling, described straight knurling part is press fit in the corresponding aperture of connected piece.

5. the captive screw of a kind of fast demountable as claimed in claim 4, is characterized in that, described in the straight knurling external diameter press-fited bottom swivel nut be greater than on connected piece with the diameter press-fiting the through hole that swivel nut is connected.