CN2457395Y - Screw - Google Patents

Abstract

The utility model relates to a screw, which comprises a rod body and a plurality of screw threads which are spirally wound on the rod body at intervals. At least two concave arcs are respectively formed on a plurality of the screw threads which are arranged on the screw, and an angular end is formed between the two concave arcs; the formation of the concave arcs and the angular end causes the screw to easily cut off the fiber of woody materials during the locking of screw and to provide bigger chip removal space simultaneously in order to achieve the functions of laborsaving operation and quick locking.

Description

Screw

The utility model relates to a kind of screw.

General screw is in order to sealed wood materials, as shown in Figure 1, it mainly cuts plank 10 by thread 12 spiral shells that its most spirals at interval are set around on the shaft 11 conventional screw 1, and with plank 10 fiber accumulations in the space of 12 of threads, and reach the effect of sealed location plank 10, though this kind commonly used screw 1 and used the effect that upward has sealed installation, but because the thread 12 of this screw 1 is smoothly circular-arc, therefore, when the operator is locked on this screw 1 on the plank 10, this thread 12 is locked in the process, can not cut off the fiber of the plank 10 of meeting in the thread process of advancing more effectively, pierce and just plank 10 fibers are strutted, like this in sealed process, it is subject to fiber and twines and the very big resistance of generation, therefore the operator must impose bigger active force, just can finish sealed operation, simultaneously, the increase of sealed power, also make screw need bear bigger sealed moment of torsion in sealed process, cause this screw 1 to be easy to generate and do not reach the phenomenon that sealed point has promptly ruptured, thereby cause the engineering time to increase, and then sealed efficient is reduced.

As shown in Figure 2, this traditional screw 7 is to cut plank 70 by thread 72 spiral shells that its a plurality of intervals spiral is set around on the shaft 71, and with plank 70 fiber accumulations in the space of 72 of threads, to reach the effect of sealed location plank 70.Form helix groove 73 on the thread 72, and form tail cutting slot 74 on the shaft 71 of below, increase chip space when sealed by helix groove 73 and tail cutting slot 74, to improve sealed efficient, yet, treat that wood chip fills up chip space after, can make the very big frictional force of generation between wood chip and plank 70 fibers again, heighten and cause screwing in moment of torsion, cause further sealed difficulty.

As shown in Figure 3, the body of this tapping screw 2 is positioned at screw head 21 and 22 of terminations and is provided with polygonal and tiltedly revolve screw thread 23 with wedge angle limit 231, because the spiral twill 23 of this tapping screw 2 is formed with wedge angle limit 231, its spiral shell is attacked to carry out favourable cutting to sealed material when sealed, and then alleviate the sealed application of force and improve sealed efficient.Then, tapping screw 2 is only applicable to the metallic material spiral shell and attacks sealed, because the space between its adjacent thread is less, if use it for sealed wood materials, enough timber fiber accumulations spaces can't be provided, to cause sealed difficulty because of the timber fiber discharges nowhere like this, simultaneously, if tapping screw 2 is when being locked on wood materials, a circular hole will be dug out to wood materials earlier in its termination 22, then be locked on circular hole with thread again,, cause sealed loosening so cause the abocclusion of timber fiber and thread real again, therefore, type in screw is different because of the difference of sealed material, correspondingly in design promptly can be variant, so the design of tapping screw 2 can't be applicable on the sealed wood materials.

The purpose of this utility model is to provide a kind of rapid operation, and has the screw of sealed fast effect.

According to above-mentioned purpose, the characteristics of the utility model screw are to be formed with at least two concave arcs respectively on several threads of this screw, form angled end between this two concave arc.

The fiber of the utility model easier cut-out wood materials when the concave arc that forms and angle end can make it sealed provides bigger chip removal space, simultaneously to reach rapid operation, sealed fast effect.

Below by in most preferred embodiment and the accompanying drawing screw of the present utility model being elaborated, in the accompanying drawing:

Fig. 1 is the user mode schematic representation of traditional screw;

Fig. 2 is the user mode schematic representation of another conventional screw;

Fig. 3 is the structural representation that the tapping screw of No. 87206885 utility model patent is announced in Taiwan;

Fig. 4 is the schematic perspective view of the screw of the utility model one preferred embodiment;

Fig. 5 is the schematic side view of the utility model one preferred embodiment shown in Fig. 4;

Fig. 6 is that the user mode of the utility model one preferred embodiment shown in Fig. 4 is looked closely generalized section;

Fig. 7 is the screw schematic perspective view of another preferred embodiment of the utility model;

Fig. 8 is that the another preferred embodiment screw of the utility model is looked closely generalized section with the user mode of general screw;

Fig. 9 is the sealed torque curve figure of the screw of the utility model preferred embodiment.

As Fig. 4 and shown in Figure 5, this screw 3 has a shaft 31, and a plurality of intervals spiral is set around the thread 32 on the shaft 31, these shaft 31 tops form the spiral shell head 311 of tool spiral shell ditch 312, continuing on these threads 32 is formed with most concave arcs 321, and 321 of adjacent concave arcs form angled end 322, and angle end 322 positions of this adjacent thread 32 as shown in Figure 5 simultaneously, promptly do not lie on the same straight line of parallel shaft 31 axis, and form the heeling condition shown in the imaginary line among the figure.

As Fig. 6 and shown in Figure 3, present embodiment screw 3 is based on sealed wood materials 4 (as plank), by the screw driver (not shown) being stretched the spiral shell ditch 312 that places on the screw 3 top spiral shell heads 311, and the tip that makes these screw 3 bottoms is inserted and to be butted on the sealed wood materials of desire 4, turn screw driver again, and screw 3 is rotated along with screw driver, as shown in Figure 5, these screw 3 spirals are set around thread 32 on the shaft 31 and look closely face and be polygon, and 322 at this polygonal angle end forms concave arc 321, when screw 3 rotates and wood materials 4 carried out spiral shell attack when sealed, this angle end 322 can be to the sharper keen cutting effect of wood materials 4 material production, and to wood materials 4 cutting forms a spiral and screws togather path 41, simultaneously, the formation of concave arc 321 on the thread 32, contact lumber fibre that can be properer when making thread 32 rotations, and can more effective lumber fibre be cut off (being the flat-cut effect), produce very big resistance to avoid thread 32 twined by fiber, in addition, the formation of concave arc 321 also makes the space that screws togather 32 of path 41 and threads of wood materials 4 increase on the thread 32, when making screw 3 spiral shells attack into wood materials 4, the wood chip of thread 32 cuttings can be placed in this space, so that better chip removal function to be provided, and avoid wood chip to pile up the sealed operation of influence, like this, by formed concave arc 321 and angle end 322 on the thread 32, more laborsaving fast when making screw 3 sealed.

Moreover, because the angle end 322 of these screw 3 adjacent threads 32 is not formed on the parallel lines of shaft 31 axis, therefore this screw 3 is subjected to applying that torsion rotates and when being locked on the wood materials 4, this isogonism end 322 spiral shell is in regular turn cut wood materials 4, and the thread 32 of avoiding this screw 3 produces great moment of torsion on the parallel lines of same axis, prevent that this thread 32 from producing damage, makes sealed operation more smooth and easy.

As shown in Figure 7, present embodiment screw 5 is roughly the same with last embodiment, also has a shaft 51, and a plurality of intervals spiral is set around the thread 52 on the shaft 51, its difference is that this screw 5 only continues and is formed with most concave arcs 521 on the thread 52 of below shaft 51, and 521 of adjacent concave arcs form angled end 522, and the thread 52 of top shaft 5l ' still keep smoothly circular-arc, owing to have the thread 52 that concave arc 521 and angle end 522 form, its area that can contact with wood materials 4 fibers is less, this timber fiber is lower with the interlock degree of compaction of thread 52 herein, for in response to the high situation of sealed requirements of tightness, by the thread 52 of these screw 5 top shafts 51

Still keep smoothly circular-arc, when sealed operation proceeds to herein, because herein thread 52

The area that contacts with wood materials 4 fibers is bigger, so can increase timber fiber and thread 52 ' the interlock degree of compaction, so two-part thread 52,52 ' design, then more can reach one side and make sealed operation quicker laborsaving, a scheme can reach again guarantees sealed closely knit tight effect.

As shown in Figure 8, present embodiment screw 6 is roughly the same with last embodiment, only its difference is in and only forms two concave arcs that continue 621 on these thread 62, and 621 of this two concave arcs form angled end 622, concave arc 621 edges then form flexuose (this jagged formation also can be performed in the thread concave arc of previous embodiment), so, the concave arc 621 on the thread 62 and the formation of angle end 622, when screw 6 rotates and wood materials 4 is carried out spiral shell when attacking sealed operation, this angle end 622 equally can be to the sharp keen cutting effect of wood materials 4 material production, add the jagged formation in concave arc 621 edges, lumber fibre is produced the sawing effect, more laborsaving fast when making screw 6 sealed.

In addition, the utility model screw 3, aforementioned general screw 1 are made torsion-testing respectively with screw 2, its test condition is:

Testing apparatus: German Σ XHATZ torsion-testing machine.

The test plank: adopt Germany hardwood is provided, humidity is 8%～10%, and specification is a length

90 millimeters of 90 millimeters height of 300 millimeters width.

Test method: 60 millimeters of screw sizes Δ IN7505M5 millimeters, 12 millimeters of washer outer diameter, 17 millimeters of thickness, screw is inserted in packing ring after, screw in 8 millimeters of hardwood plates, load onto the torsion-testing machine, make whole screw be torqued-up to active till.

Test result as shown in Figure 9, its transverse axis is the sealed time, the longitudinal axis then is sealed moment of torsion, the curve first, second, third is respectively the utility model screw 5, the torsion-testing result of aforementioned general screw 1 and screw 7, by curve second among the figure, third more as can be known, the moment of torsion that the 7 sealed initial stages of screw are produced is little than screw 1, the sealed later stage is then bigger, this be because of screw 7 by formed helix groove 73 and tail cutting slot 74, can increase the chip space when sealed, make sealed more or less freely carrying out, so when this helix groove 73 is filled up by wood chip with tail cutting slot 74, then lose the effect that it holds bits and promotes sealed efficient, so therefore its sealed moment of torsion also increases, therefore, screw 7 still can't effectively improve screw 1 existing sealed moment of torsion and reach shortcomings such as sealed efficient is low greatly, again by curve first among the figure, second, third more as can be known, the moment of torsion that is produced in the middle of the curve first is sealed is more than curve second, third is little, when being the sealed plank of the screw of above-mentioned three kinds of forms, the required moment of torsion of bestowing the utility model screw 3 of workmen can general screw 1 be little with screw 7, can avoid the situation that screw collapses tooth to take place so on the one hand, can finish the sealed operation of screw more rapidly on the one hand, increase sealed efficient.

By above-mentioned explanation, and the utility model and general work one relatively can be learnt, the certain following effect of the utility model is promoted: 1. rapid operation: the utility model screw 3 is formed with most concave arcs 321 owing to continue on its thread 32, and 321 of adjacent concave arcs form angled end 322, when carrying out sealed operation, can be by 322 pairs of sharper keen cutting effects of wood materials 4 material production of this angle end, and the formation of concave arc 321, contact lumber fibre that can be properer when making thread 32 rotations, so that it is more effective with the lumber fibre cut-out, so can reach the effect of rapid operation.2. sealed fast:

As previously mentioned, because the effect of the utility model screw 3 cutting lumber fibres is good, the space that the formation that adds concave arc 321 also makes wood materials 4 screw togather 32 of path 41 and threads increases, when making screw 3 spiral shells attack into wood materials 4, better chip removal function can be provided, and avoid wood chip to pile up, therefore make sealed operation more fast.

Claims (5)

1. screw, it has a shaft, and a plurality of intervals spiral is set around the thread on the shaft, it is characterized in that: be formed with at least two concave arcs on several threads respectively, and form angled end between this two concave arc.

2. screw as claimed in claim 1 is characterized in that: the concave arc on this adjacent thread continues mutually.

3. screw as claimed in claim 1 is characterized in that: the angle end of this adjacent thread is not formed on the same straight line of parallel shaft axis.

4. screw as claimed in claim 1 is characterized in that: this concave arc only is formed on the thread of rod body below.

5. screw as claimed in claim 1 is characterized in that: the edge of these concave arcs forms flexuose.

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