CN2563347Y

CN2563347Y - Plastic spring nail for fixing

Info

Publication number: CN2563347Y
Application number: CN 02272427
Authority: CN
Inventors: 龙飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-08-12
Filing date: 2002-08-12
Publication date: 2003-07-30
Anticipated expiration: 2012-08-12

Abstract

The utility model relates to a plastic spring nail for fixing a cooling plate on a circuit board. After the plastic spring nail goes through the cooling plate and the hole of the circuit board, the barb can recover instantaneously, and the cooling plate is accurately and firmly positioned on the circuit board. The utility model consists of a plastic spring nail, a spring inside a cylinder sleeved between a head an tail of the plastic spring nail, and a circuit board hole for the plastic spring nail going through and positioning, wherein, the tail of cylinder with a diameter less than the nail head is a trapeziform barb integrated with the hole of circuit board; the diameter of the barb part is larger than that of the cylinder; the tail of cylinder is axially provided with symmetrical grooves consisting of adjacent rectangles with the extension part of a shape of arch. The utility model is suitable for various plastic spring nails for fixing.

Description

Fix and follow closely with plastic spring

[technical field]

The utility model relates to and a kind ofly radiating fin is fastened on fixing on the circuit board follows closely with plastic spring.

[background technique]

At present, the like product that sell to use on the market such as Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, wherein: Fig. 1 is the plan view of known plastic spring nail, and Fig. 2 is the left view of Fig. 1, and Fig. 3 is the worm's eye view of Fig. 1.Fig. 4 is the plan view that another kind of known plastic spring is followed closely, and Fig. 5 is the plan view of Fig. 4.The upper end of its structure is plastic spring nail 10 and is sleeved on the spring 20 in the cylindrical body 13 between plastic spring ailing head 11, the barb 14, lower end to be formed by the diameter protrusion of cylindrical body 13 afterbodys and its one and greater than dwindling into the barb 14 that taper constitutes behind cylindrical body 13 diameters gradually, different is Fig. 1 is at barb 14 most advanced and sophisticated center indents one groove 15, and Fig. 4 then axially is provided with several parallel rectangular through holes 15 on taper barb 14.Its deficiency is:

(1) when being heated or barb position when impaired, plastic spring nail 10 easily comes off.

(2) plastic spring of Fig. 1 nail 10 is difficult for assembling, though easily assembling of the plastic spring of Fig. 4 nail 10, inject circuit board apertures 30 after, barb 14 positions can not instantaneous, abundant pop into position, has the hidden danger of coming off.

[summary of the invention]

But the purpose of this utility model is to overcome above-mentioned deficiency of the prior art and provide a kind of plastic spring nail to penetrate behind the circuit board hole barb moment to restore, radiating fin is accurately positioned on the circuit board, installs fixingly reliably to follow closely with plastic spring.

The purpose of this utility model can reach by following measure:

This radiating fin that relates to is fastened on fixing on the circuit board and follows closely with plastic spring, have: plastic spring is followed closely and is sleeved on the spring in the cylindrical body between plastic spring ailing head, the nail tail, penetrates the circuit board hole of location for the plastic spring nail, its special way is: diameter is a trapezoidal barb with its one less than the cylindrical body afterbody of ailhead, barb diameter partly is greater than cylinder diameter, and what the cylindrical body afterbody axially was provided with symmetry is the groove of arch (arc) shape formation by adjacent rectangular, its extension position.

The purpose of this utility model can also reach by following measure:

The internal diameter of spring lower end is greater than the internal diameter of spring upper end.

The diameter of barb is greater than the circuit board aperture, and the two is an interference fit.

The utility model has following advantage compared to existing technology:

1. plastic spring clenches the process of solid radiating fin in circuit board, has both adopted arcuate configuration generation elastic strain, its elasticity (rebounding force) maximum, expanding force abundance, difficult drop-off.

2. easily assembling of plastic spring nail, behind the insertion circuit board hole, the barb position can instantaneous, abundant pop into position.

3. preparation process is simple, and is easy to install and use.

[description of drawings]

Fig. 1 is the plan view of known plastic spring nail.

Fig. 2 is the left view of known plastic spring nail Fig. 1.

Fig. 3 is the worm's eye view of known plastic spring nail Fig. 1.

Fig. 4 is the plan view that another kind of known plastic spring is followed closely.

Fig. 5 is the plan view that another kind of known plastic spring is followed closely.

Fig. 6 is a stereogram of the present utility model.

Fig. 7 is a plan view of the present utility model.

Fig. 8 is the B-B sectional view of Fig. 7.

Fig. 9 is a left view of the present utility model.

Figure 10 is a right elevation of the present utility model.

Figure 11 is a plan view of the present utility model.

Figure 12 is that the A-A of Figure 11 is to sectional view.

Figure 13 is a spring structure schematic representation of the present utility model.

Figure 14 is that plastic spring nail of the present utility model is applied to the schematic representation on the circuit board.

[embodiment]

The utility model is described in further detail below in conjunction with accompanying drawing:

This product comprises: plastic spring nail 10 and be sleeved on the internal diameter of the internal diameter of the spring 20 in the cylindrical body 13, spring 20 lower ends between plastic spring ailing head 11, the nail tail 12 greater than spring 20 upper ends.Have the hole 41 that penetrates the location for plastic spring nail 10 on the circuit board 40, diameter less than cylindrical body 13 afterbodys of ailhead 11 is and the trapezoidal barb 14 of its one, and the diameter of barb 14 is greater than circuit board aperture 41, and the two is an interference fit.Barb 14 diameter partly is greater than cylindrical body 13 diameters, and what cylindrical body 13 afterbodys axially were provided with symmetry is the groove 15 of arch (arc) shape formation by adjacent rectangular, its extension position.

During use, hole 41 with two holes, the 31 alignment circuit plates 40 of radiating fin 30, insert the plastic spring nail 10 that has installed spring 20, plastic spring is followed closely in 10 insertion process, and deformation takes place spring 20, the rebounding force of spring 20 strengthens gradually, plastic spring nail barb position 14 is squeezed, and forces it to centre extruding groove 15, dwindles deformation, insert smoothly that back groove 15 resets in the circuit board apertures 41, reach radiating fin 30 is compressed and be fixed on purpose on the circuit board 40.

Claims

1, a kind of radiating fin that relates to is fastened on fixing on the circuit board and follows closely with plastic spring, have: plastic spring is followed closely and is sleeved on the spring in the cylindrical body between plastic spring ailing head, the nail tail, penetrates the circuit board apertures of location for the plastic spring nail, it is characterized in that: diameter is a trapezoidal barb with its one less than the cylindrical body afterbody of ailhead, barb diameter partly is greater than cylinder diameter, and what the cylindrical body afterbody axially was provided with symmetry is the groove of arch (arc) shape formation by adjacent rectangular, its extension position.

2, according to claim 1 fixing with the plastic spring nail, it is characterized in that: the internal diameter of spring lower end is greater than the internal diameter of spring upper end.

3, according to claim 1 fixing with the plastic spring nail, it is characterized in that: the diameter of barb is greater than the circuit board aperture, and the two is an interference fit.