CN200989360Y

CN200989360Y - Screw fixing structure

Info

Publication number: CN200989360Y
Application number: CN 200620046867
Authority: CN
Inventors: 钟元
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-10-17
Filing date: 2006-10-17
Publication date: 2007-12-12
Anticipated expiration: 2016-10-17

Abstract

The utility model discloses a new screw fixing structure. A standard element (3) is provided with a nut structure (30). A part to be disassembled is also provided with a nut structure (52). And a semi-thread fine-shaft screw (4) is arranged. When the screw is unthreaded and the part to be disassembled is separated from the standard element(3), the nut (2)of the part to be disassembled enables the screw (4) still attacked to the part to be disassembled; therefore, the screw(4) can not pop out of the product when the disassembly is finished. The utility model reduces the danger that the screw drops into the electric appliance to cause the short circuit and the problem that the screw is easy to be lost, hereby conveniently using and maintaining the electric appliance.

Description

A kind of novel screw fixed structure

[technical field]

The utility model relates to a kind of screw fixing device, need in the electrical products especially to be applied to the often screw fixing device of dismounting.

[background technique]

At present, in electrical products such as computer, screw is a kind of fastenings commonly used, has fixingly reliable, advantage such as can dismantle repeatedly.And need upgrade or characteristics such as maintenance based on electrical products such as computers, some part needs often dismounting on the electrical products.The screw that uses on the products such as present computer is full thread screw, this screw is in unloading process, can from product, separate, because the screw volume is little, in the unloading process of reality, screw is easy to fall in the electrical products, because the complexity of electrical products structure, in a single day screw is fallen into and wherein usually is difficult to take out, and perhaps needs to spend a lot of energy to take out.Sometimes, when the screw of falling into electrical products can't take out, and electrical products are when having parts such as printed circuit board (PCB), and screw very easily causes the short circuit of printed circuit board (PCB), burns out circuit board afterwards, brings about great losses.On the other hand, after the screw dismounting,, usually can drop into other place, cause losing of screw,, will bring more trouble for the user so if this screw is not the screw of using always because its volume is little.

As depicted in figs. 1 and 2,1 is full thread screw, and 2 for needing the part of dismounting, 3 benchmark pieces; After the process of dismounting part is finished, need the part 2 of dismounting to separate, and screw 1 can separate simultaneously with the part 2 of needs dismounting with benchmark piece 3, so screw from product, separate, thereby can cause above-mentioned puzzlement.

[summary of the invention]

In product up-gradation or maintenance process, be easy to fall into the deficiency that electrical products cause short circuit and are easy to lose in order to solve current widely used full thread screw, the utility model use the thin bar screw of partial thread band with and corresponding screw fixed structure, solve in the screw electrical products and cause short circuit and be easy to the problem of losing, provide convenience in the dismounting screw process when electrical products being upgraded or keep in repair for operator or user.

The technological scheme that its technical problem that solves the utility model adopts is: in electrical products, use be the screw of the thin bar of partial thread band, its thin rod part divides diameter less than the helical thread portion diameter; On benchmark piece, have corresponding thread, on the part of needs dismounting, also have thread simultaneously; When dismounting, screw is deviate from from the thread of benchmark piece so, and the thread that needs to have on the part of dismounting stops screw from wherein deviating from (screw being back-outed unless use external force); So just can reach when the part that needs dismounting separates with benchmark piece, screw still is retained in purpose on the part that needs dismounting; That is to say that after the dismounting of finishing electrical products, screw still is retained on the electrical products, the defective that this has just been avoided the conventional screw fixation method to be brought.

The beneficial effects of the utility model are, when the dismounting electrical products, screw can not break away from electrical products, avoid screw to fall into causing short circuit and screw to lose in the electrical products being difficult for giving for change waiting danger, and are simple in structure.

[description of drawings]

Fig. 1 is existing full thread screw;

Fig. 2 is the sectional drawing of the fixed structure of existing screw correspondence;

Fig. 3 is the thin bar screw of partial thread band that the utility model uses;

Fig. 4 is the sectional drawing of first example of the utility model fixedly the time;

Schematic representation when Fig. 5 is first example dismounting of the utility model;

Fig. 6 is the sectional drawing of second example of the utility model fixedly the time;

Schematic representation when Fig. 7 is second example dismounting of the utility model;

Fig. 8 is the sectional drawing of the 3rd example of the utility model fixedly the time;

Schematic representation when Fig. 9 is the 3rd example dismounting of the utility model;

1. full thread screws among the figure, the 2. part that need dismantle, 3. benchmark piece, the 4. thin bar screw of partial thread band, 5. sheet metal part, 6. printed circuit board (PCB), 7. double-screw bolt, 8. plastic parts.

[embodiment]

The screw that the utility model uses is the thin bar screw of partial thread band, sees also shown in Figure 3ly, and its screw rod is made up of two-part, and 40 is the thin rod part branch, and 41 is helical thread portion; Basic principle of the present utility model is also to have the thread structure on the part of needs dismounting simultaneously, when the dismounting screw, utilize instruments such as screw-driver that screw is deviate from from the thread of benchmark piece, making needs the part of dismounting to separate with benchmark piece, and the thread structure on the part that needs to dismantle stops that screw separates from the part of needs dismounting, be that screw is attached on the part that needs dismounting, unless use the external force could be with the separating of the part of screw and needs dismounting, thus reached the dismounting purpose simultaneously screw do not separate with product.

Fig. 4 and Fig. 5 are first example of the utility model, and need the part of dismounting this moment is sheet metal part.When the part of needs dismountings is sheet metal part 5, on sheet metal part, have the part 50 that cooperates with benchmark piece, projection 51 and with screw 4 corresponding thread structures 52; When fixedly sheet metal part is on benchmark piece, at first utilize instruments such as screw-driver that screw is screwed in the sheet metal part, this moment, screw just was attached on the sheet metal part, after being positioned over the two on the benchmark piece, and then screw is screwed in the thread 30 of benchmark piece 3, sheet metal part just is fixed on the benchmark piece, sees also the sectional drawing of Fig. 4 sheet metal part after being fixed on the benchmark piece.When needs are dismantled, utilize screw-driver with the back-out thread 30 of benchmark piece 3 of screw 4, this moment, sheet metal part separated with benchmark piece, realized the purpose of dismounting; And because thread 52 on the sheet metal part 5 and the thread 30 on the benchmark piece have certain distance, during utilizing screw-driver that screw 4 is back-outed to make in the process of thread 30 of benchmark piece 3 thread 52 of screw 4 from sheet metal part 5, back-out, screw 4 just continues to be attached on the sheet metal part 5 like this, unless external force such as continuation use screw-driver could be separated the two, see also the schematic representation that Fig. 5 sheet metal part 5 separates with benchmark piece 3.

Fig. 6 and Fig. 7 are second example of the utility model, and need the part of dismounting this moment is printed circuit board (PCB) 6.At first welding screw 7 on printed circuit board (PCB) makes the two become indivisible integral body; Double-screw bolt 7 mainly is made up of thread structure 70 and cylindrical cavity part 71; Its working principle is similar to above-mentioned sheet metal part;

Fig. 8 and Fig. 9 are the 3rd example of the utility model, and need the part of dismounting this moment is plastic parts 8.Have thread structure 80 and cylindrical cavity part 81 on the plastic parts 8, can use insert (mold insert) to replace thread structure 80; Its working principle is similar to above-mentioned sheet metal part.

Claims

1. novel screw fixed structure, comprise benchmark piece, the part that need be disassembled and screw: screw is the thin bar screw of partial thread band, and its thin rod part divides diameter less than the helical thread portion diameter; When unclamping screw, when the part of needs dismounting was separated with benchmark piece, screw was retained on the part that needs dismounting, it is characterized in that: have thread on the part of needs dismounting, prevent that screw from deviating from from the part of needs dismounting.

2. screw fixed structure according to claim 1 is characterized in that: screw is the thin bar screw of partial thread band, and its thin rod part divides diameter less than the helical thread portion diameter.

3. screw fixed structure according to claim 1 is characterized in that: when the part of needs dismounting is sheet metal part, local crowning is arranged on the sheet metal part, its convex portion has the thread structure corresponding with screw.

4. screw fixed structure according to claim 1 is characterized in that: when the part of needs dismounting is printed circuit board (PCB), and a kind of double-screw bolt of welding on the printed circuit board (PCB).

5. screw fixed structure according to claim 4 is characterized in that: double-screw bolt has cylindrical cavity part and thread part, and cylindrical cavity part internal diameter is greater than thread part internal diameter.

6. screw fixed structure according to claim 1 is characterized in that: when the part of needs dismounting was plastic parts, plastic parts had cylindrical cavity part and thread part, and cylindrical cavity part internal diameter is greater than thread part internal diameter.

7. screw fixed structure according to claim 6 is characterized in that: can replace the thread part with mold insert.