CN112276843B

CN112276843B - Improved screwdriver and improved screw

Info

Publication number: CN112276843B
Application number: CN202010919041.6A
Authority: CN
Inventors: 刘杰
Original assignee: Dongguan Jinjia Precision Parts Co ltd
Current assignee: Dongguan Jinjia Precision Parts Co ltd
Priority date: 2019-09-28
Filing date: 2020-09-04
Publication date: 2022-05-03
Anticipated expiration: 2040-09-04
Also published as: CN112276843A

Abstract

The invention discloses an improved screwdriver and an improved screw; the screwdriver comprises a screwdriver handle and a screwdriver rod connected with the screwdriver handle into a whole, wherein a cross screwdriver head is arranged at one end of the screwdriver rod, which is far away from the screwdriver handle, the cross screwdriver head comprises four petal parts which are arranged in a cross shape and are used for being embedded into a cross groove of a screw, and a sheet body is formed on the outer surface of each petal part; the screw comprises a main body part and a cover body part, wherein the main body part comprises a screw cap and a threaded rod connected with the bottom of the screw cap, a cross groove is formed in the top of the screw cap, a cavity is formed between the cover body part and the upper surface of the screw cap, a hole for the screwdriver rod of the screwdriver to pass through is formed in one side, far away from the screw cap, of the cover body part, four groove bodies are formed in the outer edge of the hole, and the four groove bodies are distributed around the center line of the hole at equal intervals. When the screwdriver is used, the screw can be firmly attached to the screwdriver, and the problem that the screw is easy to deviate when being placed into the sunken threaded hole can be avoided.

Description

Improved screwdriver and improved screw

Technical Field

The invention relates to the field of screwdrivers and screws.

Background

A screwdriver is a common hardware tool used to tighten or loosen screws. At present, the head of a plurality of screw drivers is magnetic and is used for adsorbing screws. As shown in fig. 1, especially in some deep sunken screw holes, the screw hole b cannot be reached by hand, so that it is difficult to align the screw with the screw hole b by hand, so that the screw needs to be attracted by the magnetism of the screwdriver, and then the screw is sent into the sunken screw hole b by the screwdriver, so that the screw is accurately aligned with the screw hole.

In the actual operation process, the following problems often occur: in the process of feeding the screw into the threaded hole b, the screw is easy to shift, especially when touching the side wall of the counter bore; and once the deviation occurs, the screw cannot be aligned with the threaded hole b, and at the moment, the screw needs to be taken out and then is adsorbed on the head of the screwdriver again and then is put in again. Not only does this delay time, but tightening during misalignment can also lead to a situation of slipping of the thread, causing damage to the threads and even greater inconvenience.

Disclosure of Invention

The invention aims to provide an improved screwdriver and an improved screw, so that the screw can be firmly attached to the screwdriver, and the screw is prevented from being deviated when being placed into a sunken threaded hole.

The technical scheme adopted by the invention for solving the technical problems is as follows: in a first aspect, the present invention provides an improved screwdriver kit comprising a screwdriver and a screw;

the screwdriver comprises a screwdriver handle and a screwdriver rod connected with the screwdriver handle into a whole, wherein a cross screwdriver head is arranged at one end of the screwdriver rod, which is far away from the screwdriver handle, and comprises four petal parts which are arranged in a cross shape and are used for being embedded into a cross groove of a screw; wherein, the outer surface of each valve part is provided with a sheet body;

the screw comprises a main body part and a cover body part; the main body part comprises a screw cap and a threaded rod connected with the bottom of the screw cap, and a cross groove is formed in the top of the screw cap; the cover body part is arranged at the top of the screw cap, a cavity is formed between the cover body part and the upper surface of the screw cap, a hole for the cross cutter head to pass through is formed in one side of the cover body part, which is far away from the screw cap, four groove bodies are formed in the outer edge of the hole, the four groove bodies are distributed around the center line of the hole at equal intervals and are used for the sheet bodies to be inserted into; the height of the cavity can ensure that the sheet body is completely separated from the groove body when the petal part of the cross cutter head sinks to the bottommost part of the cross groove of the screw.

Furthermore, the sheet body has magnetism, and the cover body part is made of ferromagnetic materials; and when the sheet body is inserted into the groove body, the sheet body and the groove body are in clearance fit.

The working principle of the technical scheme is as follows: when the screw is attached to the cross head of the screwdriver, the cross head is aligned with the hole of the screw cover body, then the cross head is inserted into the hole, and four sheet bodies of the cross head are respectively inserted into the corresponding groove bodies during insertion; because the sheet body is magnetic and the cover body part is made of ferromagnetic materials, after the sheet body is inserted into the slot body, the cover body part can be firmly adsorbed by the sheet body, and further, the screw can be firmly attached to the screwdriver; different from the existing adsorption mode: because the four sheet bodies are additionally arranged on the cross cutter head and are respectively inserted into the four groove bodies in an absorption manner, the positioning effect can be achieved, and the deviation of the screw is limited to a certain extent from four directions; therefore, after the screw is attached to the cross head of the screwdriver, the screw can be prevented from deviating as much as possible in the process of being placed into the sunken threaded hole.

Or, further, the groove body of the cover body part is formed on the rubber material; when the sheet body is inserted into the groove body, the sheet body and the groove body are in interference fit.

The working principle of the technical scheme is as follows: similarly, when the screw is attached to the cross head of the screwdriver, the cross head is aligned with the hole of the screw cover body, then the cross head is inserted into the hole, and four sheet bodies of the cross head are respectively inserted into the corresponding groove bodies during insertion; because the vicinity of the groove body is made of rubber and has certain elasticity, and the sheet body and the groove body are in interference fit, after the sheet body is inserted into the groove body, the sheet body can be firmly clamped by the rubber, and further the screw can be firmly attached to the screwdriver; different from the existing adsorption mode: because the four sheet bodies are additionally arranged on the cross cutter head and are respectively inserted into the four groove bodies in an interference fit manner, the positioning effect can be achieved, and the deviation of the screw is limited to a certain extent in four directions; therefore, after the screw is attached to the cross head of the screwdriver, the screw can be prevented from deviating as much as possible in the process of being placed into the sunken threaded hole.

Furthermore, the opening at the top and the opening at the bottom of the groove body are both provided with slope flaring structures. The slope flaring structure can facilitate the sheet body to be inserted into the groove body.

Furthermore, the center of the cross cutter head is provided with a slender and cylindrical strip-shaped groove, the top of the strip-shaped groove is closed, the bottom of the strip-shaped groove extends to the bottom surface of the cross cutter head, and an opening is formed in the bottom surface;

a spring and a slender round rod are arranged in the strip-shaped groove; the spring is positioned above the round rod, the top end of the spring is propped against the top wall of the strip-shaped groove, and the bottom end of the spring is propped against the top of the round rod; the bottom of the round rod extends out of the strip-shaped groove, the round rod is limited and cannot naturally fall out of the strip-shaped groove, and the round rod can be completely retracted into the strip-shaped groove when moving towards the direction of the compression spring;

when the sheet body of the screwdriver is inserted into the lowest point of the groove body of the cover body part, the bottom of the round rod extends into the cross groove of the screw and abuts against the bottom surface of the cross groove, and the spring is in a natural state at the moment.

In the above technical scheme, when the sheet body is inserted into the lowest point of the groove body, because the round rod is abutted against the bottom surface of the cross groove and the spring is in a natural state, no action force can be applied to the round rod, when the cover body part is sleeved on the cross cutter head, the situation of being sleeved too deeply can be avoided, namely, when the cross cutter head is inserted into the hole of the cover body part, once the round rod is abutted against the bottom surface of the cross groove, the round rod is inserted in place, if the round rod is inserted too deeply, the round rod can be pushed by the top of the cross groove and retracted upwards, the spring is compressed, once a hand leaves the screw, the elastic restoring force of the spring can push the round rod to move downwards, and then the top of the cover body part moves downwards to the position where the spring is in a natural state (namely, the sheet body is moved to the position where the lowest point is inserted into the groove body). It is thus clear that above-mentioned technical scheme's structure can ensure that the lamellar body inserts suitable position in the cell body, can self return when inserting too deeply to it is internal to ensure the embedded groove of lamellar body energy at utmost, in order to ensure the effect of restriction skew.

Further, an arc-shaped flaring transition section is arranged at a position, close to the bottom opening, of the strip-shaped groove, the inner diameter of the strip-shaped groove, located on one side, far away from the opening, of the arc-shaped flaring transition section is larger, and the inner diameter of the strip-shaped groove, located on one side, close to the opening, of the arc-shaped flaring transition section is smaller;

the outer wall of the round rod is provided with a circle of cambered convex parts bulged outwards, and the maximum height of the cambered convex parts is not more than 2.5 mm; the round bar can not naturally fall out from the strip-shaped groove due to the matching of the cambered surface convex part and the cambered flaring transition section.

In the structure, the arc-shaped convex part bulges outwards, the diameter below the arc-shaped flaring transition section is smaller, and the diameter above the arc-shaped flaring transition section is larger, so that the lowest point of the downward movement of the round rod is the position where the arc-shaped convex part is contacted with the arc-shaped flaring transition section, and the round rod cannot fall down naturally;

in the above structure, the step of mounting the round bar is: after the upper part of the round rod is inserted into the strip-shaped groove, the bottom of the round rod is knocked forcefully, so that the arc-shaped convex part is knocked into the strip-shaped groove and gradually moves into the groove until the arc-shaped convex part moves into the arc-shaped flaring transition section; the steps when taking out the round bar are as follows: and (4) clamping the round rod by using pliers and pulling outwards forcibly to gradually move the arc-shaped convex part away from the strip-shaped groove.

Further, the sheet body has a height of 2mm-8mm, a length of 2mm-5mm and a width of 1.5mm-3.5 mm.

Further, the height of the groove body is between 0.8 and 1.2 times of the height of the sheet body.

Furthermore, a circle of convex ring is formed on the periphery of the cross-shaped groove on the upper surface of the screw cap, external threads are arranged on the whole section of the outer wall of the convex ring, and the inner diameter of the convex ring is larger than the distance value between the outer surfaces of the two opposite sheet bodies on the cross-shaped cutter head;

the inner wall of the bottom of the cover body is concave inwards to form a section of internal thread, the internal thread can be screwed with the external thread of the convex ring, and the length of the thread sections of the internal thread and the external thread is consistent.

In the technical scheme, the cover body part and the screw cap are detachably connected by matching the internal thread and the external thread, and under certain conditions, the cover body part can be detached when the cover body part is not needed.

In a second aspect, the invention provides an improved screwdriver separately by separating the screwdriver kit, which comprises a screwdriver handle and a screwdriver rod integrated with the screwdriver handle, wherein a cross screwdriver head is arranged at one end of the screwdriver rod far away from the screwdriver handle, the cross screwdriver head comprises four petal parts which are arranged in a cross shape and are used for being embedded into a cross groove of a screw, and a sheet body is formed on the outer surface of each petal part.

Further, the sheet body has magnetism.

Furthermore, the center of the cross cutter head is provided with a long and thin cylindrical strip-shaped groove, the top of the strip-shaped groove is closed, the bottom of the strip-shaped groove extends to the bottom surface of the cross cutter head, and an opening is formed in the bottom surface;

a spring and a slender round rod are arranged in the strip-shaped groove; the spring is positioned above the round rod, the top end of the spring is abutted against the top wall of the strip-shaped groove, and the bottom end of the spring is abutted against the top of the round rod; the bottom of round bar extends to outside the bar groove, and the round bar receives spacingly and can't fall out by the bar inslot nature, and can retract completely in the bar groove when the round bar removes to compression spring's direction.

In a third aspect, the present invention provides an improved screw comprising a body portion and a cover portion, wherein the screw comprises a screw head and a screw driver; the main body part comprises a screw cap and a threaded rod connected with the bottom of the screw cap, and a cross groove is formed in the top of the screw cap; the cover body part is arranged at the top of the screw cap, a cavity is formed between the cover body part and the upper surface of the screw cap, a hole for the cutter bar of the screwdriver to penetrate is formed in one side, far away from the screw cap, of the cover body part, four groove bodies are formed in the outer edge of the hole, and the four groove bodies are distributed around the center line of the hole at equal intervals.

Further, the cover portion is made of a ferromagnetic material.

Further, the groove body of the cover body part is formed on the rubber material.

Furthermore, the opening at the top and the opening at the bottom of the groove body are both provided with slope flaring structures.

Further, a circle of convex ring is formed on the periphery of the cross-shaped groove on the upper surface of the screw cap, and external threads are arranged on the whole section of the outer wall of the convex ring; and a section of internal thread is formed on the inner wall of the bottom of the cover body after being recessed inwards, the internal thread can be screwed with the external thread of the convex ring, and the length of the thread sections of the internal thread and the external thread is consistent.

Drawings

FIG. 1 is a schematic view of a conventional screw and a sunk threaded hole;

fig. 2 is a schematic structural view of a modified screw tool kit of embodiment 1 or embodiment 2;

FIG. 3 is a schematic view of the blade of the Phillips head of FIG. 2 inserted into the slot of the cap portion;

FIG. 4 is a schematic view of the petals of the Phillips head of FIG. 2 inserted into the Phillips recess of the nut;

FIG. 5 is an exploded view of the screw of FIG. 2;

FIG. 6 is a perspective view of the upper portion of the screw of FIG. 2;

FIG. 7 is a top view of the screw cap portion of FIG. 5;

FIG. 8 is a top view of the nut of the screw of FIG. 5;

FIG. 9 is a schematic view of a screwdriver with a slotted blade in the cross head and a spring and a round bar;

FIG. 10 is an enlarged view of circle A of FIG. 9;

fig. 11 is a schematic view of a slope flaring structure arranged at the opening of the top of the groove body of the cover body part.

Detailed Description

The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.

Example 1:

the present embodiment provides an improved screwdriver kit comprising a screwdriver 1 and a screw 2.

Referring to fig. 2, the screwdriver 1 includes a screwdriver handle 11 and a screwdriver rod 12 connected with the screwdriver handle 11 into a whole, one end of the screwdriver rod 12 away from the screwdriver handle 11 is provided with a cross screwdriver head 121, the cross screwdriver head 121 includes four petals 1211, and the four petals 1211 are arranged in a cross shape and are used for being embedded in cross grooves 2111 of screws; wherein, a sheet 1212 is formed on the outer surface of each flap portion 1211.

Referring to fig. 2-8, the screw 2 includes a body portion 21 and a cover portion 22; the main body part 21 comprises a screw cap 211 and a threaded rod 212 connected with the bottom of the screw cap 211, and a cross-shaped groove 2111 is formed in the top of the screw cap 211; the cover part 22 is arranged at the top of the nut 211, a cavity 23 is formed between the cover part 22 and the upper surface of the nut 211, a hole 221 for the cross cutter head 121 to pass through is formed in one side of the cover part 22 away from the nut 211, four grooves 222 are formed in the outer edge of the hole 221, and the four grooves 222 are distributed around the center line of the hole 221 at equal intervals and are used for the sheet bodies 1212 to be inserted into; the height of the cavity 23 ensures that the blade 1212 is completely disengaged from the slot 222 when the lobe 1211 of the cross head 121 is sunk to the bottom of the cross groove 2111 of the screw 2, as shown in fig. 4.

In this embodiment, the blade 1212 has magnetic properties, and the cover portion 22 is made of a ferromagnetic material; and when the blade 1212 is inserted into the slot 222, the blade 1212 and the slot 222 are in clearance fit.

When the screw 2 needs to be attached to the cross head 121 of the screwdriver 1, the cross head 121 is aligned with the hole 221 of the cover portion 22 of the screw 2, and then the cross head 121 is inserted into the hole, wherein four sheets 1212 of the cross head 121 are inserted into the corresponding slots 222 respectively when the screw is inserted, as shown in fig. 3; because the sheet 1212 has magnetism and the cover portion 22 is made of ferromagnetic material, after the sheet 1212 is inserted into the slot 222, the cover portion 22 can be firmly attracted by the sheet 1212, and the screw 2 can be firmly attached to the screwdriver 1. The difference between the present embodiment and the existing suction method without the blade 1212 and the groove 222 is that: because the four sheet bodies 1212 are additionally arranged on the cross cutter head 121 and the four sheet bodies 1212 are respectively inserted into the four grooves 222 in an absorption manner, the positioning function can be achieved, and the situation that the screws 2 deviate from each other is limited in four directions; therefore, after the screw 2 is attached to the cross bit 121 of the screwdriver 1, in the process of being placed into the sunken type threaded hole b, even if the screw 2 touches the side wall of the counterbore, the deviation is not easy to occur, so that the efficiency of screw assembly can be ensured. The screw tightening steps are as follows: in the adsorption state shown in fig. 3, after the screw 2 is inserted into the sunken hole and aligned with the threaded hole b, the screwdriver 1 is pushed forcefully to make the four petals 1211 of the cross bit 121 sink to the bottom of the cross groove 2111 of the screw 2, i.e., the state shown in fig. 4 (at this time, the sheet 1212 is removed from the groove 222), and then the screw 2 can be screwed by rotating the screwdriver 1; the screwdriver is taken out in the following steps: after the screws are screwed, the matching state of the screws 2 and the screwdriver 1 is also shown in fig. 4, when the screwdriver 1 is taken out, the screwdriver 1 is pulled backwards with force, the sheet bodies 1212 of the cross bit 121 return to the groove body 222 again, and then the screwdriver 1 can be taken out by continuously applying force to overcome the magnetic force and separate from the groove body 222; when it is desired to loosen the screw, the cross bit 121 of the screwdriver 1 is again inserted into the hole 221 and the flap 1211 is lowered to the bottom of the cross slot 2111 of the screw 2, so that the screw can be loosened.

Preferably, the opening at the top and the opening at the bottom of the groove body 222 are both provided with a sloping surface flaring structure 2221, and the sloping surface flaring structure 2221 flares outwards in a splayed shape at the opening of the groove body 222, as shown in fig. 11. The ramped flare 2221 can facilitate insertion of the blade 1212 into the slot 222.

Preferably, as shown in fig. 9, the cross-shaped tool bit 121 is provided with an elongated and cylindrical groove 1213 at the center, the top of the groove 1213 is closed, and the bottom extends to the bottom surface of the cross-shaped tool bit 121, and an opening is formed on the bottom surface; a spring 1214 and an elongated round rod 1215 are mounted in the slot 1213; the spring 1214 is positioned above the round rod 1215, the top end of the spring 1214 is propped against the top wall of the strip-shaped groove 1213, and the bottom end of the spring 1214 is propped against the top of the round rod 1215; the bottom of round rod 1215 extends to the outside of slot 1213, round rod 1215 is limited and cannot fall out of slot 1213, and round rod 1215 can be completely retracted into slot 1213 when moving towards compression spring 1214; when the blade 1212 of the screwdriver 1 is inserted into the lowest point of the slot 222 of the cover 22 (see fig. 3, i.e. when the bottom surface of the blade 1212 is flush with the bottom surface of the slot 222), the bottom of the round rod 1215 extends into the cross-shaped groove 2111 of the screw 2 and abuts against the bottom surface of the cross-shaped groove 2111, and the spring 1214 is in a natural state.

In the above preferred embodiment, when the blade 1212 is inserted into the lowest point of the slot 222, since the rod 1215 abuts against the bottom surface of the cross-shaped groove 2111 and the spring 1214 is in a natural state, no force is applied to the rod 1215, so that when the cap portion 22 is sleeved on the cross head 121, it is avoided that the cap portion is sleeved too deeply, that is, when the cross head 121 is inserted into the hole 221 of the cap portion 22, once the rod 1215 abuts against the bottom surface of the cross-shaped groove 2111, the rod 1215 is inserted in place, and if the insertion is too deep, the rod 1215 is pushed by the cross-shaped groove 2111 to retract upwards, so that the spring 1214 is compressed, and once the hand leaves the screw 2, the elastic restoring force of the spring 1214 pushes the rod 1215 downwards, and further pushes the cap portion 22 downwards, until the spring 1214 returns to the natural state (i.e., moves to a position where the blade 1212 is inserted into the lowest point of the slot 222). It can be seen that the structure of the above preferred embodiment can ensure that the blade 1212 is inserted into the groove 222 at a proper position and can automatically return when the blade is inserted too deeply, so as to ensure that the blade 1212 can be maximally inserted into the groove 222, thereby ensuring the effect of limiting the deviation.

Based on the above preferred solution, further, referring to fig. 10, the strip-shaped groove 1213 is provided with an arc-shaped flared transition section 12131 at a position closer to the bottom opening, the inner diameter of the strip-shaped groove 1213 at the side of the arc-shaped flared transition section 12131 away from the opening is larger, and the inner diameter of the strip-shaped groove 1213 at the side close to the opening is smaller, that is, h1 in fig. 10 is smaller than h 2; the outer wall of the round rod 1215 is provided with a circle of outward-bulging cambered protrusions 12151, and the maximum height of the convex parts 12151 is not more than 2.5 mm; the round stem 1215 cannot naturally fall out of the slot 1213 due to the engagement of the convex arc 12151 with the flared transition section 12131; preferably, the embossments 12151 are in interference fit with the strip-shaped grooves 1213 on the side of the arcuate flared transition 12131 near the opening, i.e., the embossments 12151 are in interference fit with the h 1.

In a further aspect, because the arcuate projections 12151 bulge outwardly and the arcuate flared transition 12131 has a smaller diameter below and a larger diameter above, the lowest point of downward movement of the round rod 1215 is where the arcuate projections 12151 contact the arcuate flared transition 12131, and the round rod 1215 cannot fall off naturally. Wherein, the steps when installing the round rod 1215 are: after the upper part of round rod 1215 is inserted into strip-shaped groove 1213, the bottom of round rod 1215 is knocked with force, so that arc-shaped protrusion 12151 is knocked into strip-shaped groove 12131 and gradually moves into the groove until moving into arc-shaped flaring transition section 12131 (which means that arc-shaped protrusion 12151 can be knocked into strip-shaped groove 1213 by knocking with force because arc-shaped protrusion 12151 and h1 are in interference fit); the steps in removing the round rod 1215 are: the rod 1215 is grasped by pliers and pulled outward to move arcuate projection 12151 away from slot 1213.

Preferably, the blade 1212 is a rectangular parallelepiped structure having a height of 2mm-8mm (preferably 4mm), a length of 2mm-5mm, and a width of 1.5mm-3.5 mm. Wherein, height, width and length refer to: the horizontal lines of the left and right blades 1212 in fig. 4 are the lengths of the blades 1212, the vertical lines are the heights of the blades 1212, and the horizontal line of the middle blade 1212 in fig. 4 is the width of the blade 1212.

Preferably, the height of the groove 222 is between 0.8 and 1.2 times (preferably 4mm) the height of the blade 1212, so that the length of the groove is equal to the length of the blade 1212, thereby ensuring a limiting effect.

Preferably, as shown in fig. 5 and 8, a ring of convex rings 2112 is formed on the periphery of the cross-shaped groove 2111 on the upper surface of the nut 211, the whole section of the outer wall of the convex ring 2112 is provided with external threads 21121, and the inner diameter of the convex ring 2112 is greater than the distance value between the outer surfaces of two opposite blade bodies 1212 on the cross-shaped tool bit 121, so as to ensure that the blade bodies 1212 do not interfere with the convex ring 2112 when extending into the cavity 23; the inner wall of the bottom of the cover part 22 is concave to form a section of internal thread 223, the internal thread 223 can be screwed with the external thread 21121 of the convex ring 2112, and the length of the thread sections of the two is the same.

In the preferred embodiment described above, the engagement of internal threads 223 with external threads 21121 allows cover portion 22 to be removably coupled to nut 211, and in some cases, cover portion 22 may be removed when cover portion 22 is not needed.

Example 2:

the present embodiment is different from embodiment 1 in that: the slot 222 of the cover 22 is made of rubber, i.e. the upper half of the cover 22 can be made of rubber, and the lower half can be made of other materials, such as plastic and metal; also, the blade 1212 may be nonmagnetic at this time; when the blade 1212 is inserted into the slot 222, the blade 1212 and the slot 222 are in an interference fit.

In this embodiment, similarly, when the screw 2 is attached to the cross head 121 of the screwdriver 1, the cross head 121 is aligned with the hole 221 of the cover portion 22 of the screw 2, and then the cross head 121 is inserted into the hole, wherein the four sheets 1212 of the cross head 121 are inserted into the corresponding slots 222 respectively; because the vicinity of the slot 222 is made of rubber and has certain elasticity, and the sheet 1212 is in interference fit with the slot 222, after the sheet 1212 is inserted into the slot 222, the sheet 1212 can be firmly clamped by the rubber, and the screw 2 can be firmly attached to the screwdriver 1; the difference from the conventional suction method without the blade 1212 and the groove 222 is that: because the four sheet bodies 1212 are additionally arranged on the cross head 121 and the four sheet bodies 1212 are respectively inserted into the four grooves 222 in an interference fit manner, the positioning function can be achieved, and the deviation of the screw 2 is limited to a certain extent from four directions; therefore, after the screw 2 is attached to the cross bit 121 of the screwdriver 1, in the process of being placed into the sunken type threaded hole b, even if the screw 2 touches the side wall of the counterbore, the deviation is not easy to occur, so that the efficiency of screw assembly can be ensured.

In addition, in this embodiment, the steps of tightening the screw, removing the screwdriver, and loosening the screw are substantially the same as those in embodiment 1, except that the force to be overcome when the sheet 1212 moves is not a magnetic force any longer, but a frictional force due to the pressing of the groove 222.

Example 3:

referring to fig. 2, the present embodiment separates the screw tool kit of the above embodiments, and separately provides an improved screwdriver, which includes a shank 11 and a tool bar 12 connected to the shank 11, wherein an end of the tool bar 12 away from the shank 11 has a cross head 121, the cross head 121 includes four petals 1211, the four petals 1211 are arranged in a cross shape and are used for being inserted into a cross groove of a screw, and a sheet 1212 is formed on an outer surface of each petal 1211.

Preferably, the blade 1212 has magnetic properties.

Preferably, referring to fig. 9, the center of the cross-shaped blade 121 is provided with an elongated and cylindrical groove 1213, the top of the groove 1213 is closed, and the bottom of the groove extends to the bottom surface of the cross-shaped blade 121, and an opening is formed on the bottom surface; a spring 1214 and an elongated round rod 1215 are arranged in the strip groove 1213; the spring 1214 is positioned above the round rod 1215, the top end of the spring 1214 is propped against the top wall of the strip-shaped groove 1213, and the bottom end of the spring 1214 is propped against the top of the round rod 1215; the bottom of the round rod 1215 extends to the outside of the slot 1213, the round rod 1215 is limited and cannot fall out of the slot 1213, and the round rod 1215 can be retracted into the slot 1213 when moving towards the compression spring 1214.

Preferably, referring to fig. 10, the strip-shaped groove 1213 is provided with an arc-shaped flaring transition section 12131 at a position closer to the bottom opening, the inner diameter of the strip-shaped groove 1213 at the side of the arc-shaped flaring transition section 12131 away from the opening is larger, and the inner diameter of the strip-shaped groove 1213 at the side close to the opening is smaller, that is, h1 in fig. 10 is smaller than h 2; the outer wall of the round rod 1215 is provided with a circle of outward-bulging cambered protrusions 12151, and the maximum height of the convex parts 12151 is not more than 2.5 mm; the round rod 12151 cannot naturally fall out of the strip-shaped groove 1213 due to the cooperation of the cambered convex part 12151 and the arc-shaped flaring transition section 12131; preferably, the embossments 12151 are in interference fit with the strip-shaped grooves 1213 on the side of the arcuate flared transition 12131 near the opening, i.e., the embossments 12151 are in interference fit with the h 1.

Preferably, the blade 1212 has a height of 2mm-8mm, a length of 2mm-5mm and a width of 1.5mm-3.5 mm.

The screwdriver of the present embodiment is substantially the same as the screwdriver of the kit of embodiment 1, and the present embodiment is only described by listing it separately.

Example 4:

referring to fig. 2-8 and 11, this embodiment separates the screw tool kit of the above embodiments, and separately provides a modified screw, which includes a body portion 21 and a cover portion 22; the main body part 21) comprises a screw cap 211 and a threaded rod 212 connected with the bottom of the screw cap 211, and the top of the screw cap 211 is provided with a cross-shaped groove 2111; the cover portion 22 is disposed on the top of the nut 211, a cavity 23 is formed between the cover portion 22 and the upper surface of the nut 211, a hole 221 for allowing a tool bar of a screwdriver to pass through is disposed on one side of the cover portion 22 away from the nut 211, four grooves 222 are formed in the outer edge of the hole 221, and the four grooves 222 are distributed around the center line of the hole 221 at equal intervals.

Preferably, the cover portion 22 is made of a ferromagnetic material.

Preferably, the slot 222 of the cover portion 22 is formed in a rubber material.

Preferably, the top opening and the bottom opening of the groove body 222 are provided with a slope flaring structure 2221.

Preferably, a circle of convex ring 2112 is formed at the periphery of the cross-shaped groove 2111 on the upper surface of the screw cap 211, and the whole section of the outer wall of the convex ring 2112 is provided with an external thread 21121; the inner wall of the bottom of the cover part 22 is recessed to form a section of internal thread 223, the internal thread 223 can be screwed with the external thread 21121 of the convex ring 2112, and the length of the thread sections is the same.

The screws of this embodiment are substantially identical to the screws of the kit of embodiment 1 or embodiment 2, and this embodiment is merely a list of them for illustration.

The present invention is not limited to the above preferred embodiments, but various changes and modifications can be made by those skilled in the art, and any modifications, equivalent substitutions, improvements, etc., which are within the spirit and principle of the present invention, are included in the protection scope of the present invention.

Claims

1. An improved screw, characterized by comprising a body portion (21) and a cover portion (22); the main body part (21) comprises a screw cap (211) and a threaded rod (212) connected with the bottom of the screw cap (211), and a cross groove (2111) is formed in the top of the screw cap (211); the cover body part (22) is arranged at the top of the nut (211), a cavity (23) is formed between the cover body part (22) and the upper surface of the nut (211), a hole (221) for a screwdriver rod of a screwdriver to penetrate is formed in one side, away from the nut (211), of the cover body part (22), four groove bodies (222) are formed in the outer edge of the hole (221), and the four groove bodies (222) are distributed around the center line of the hole (221) at equal intervals; and, the cover portion (22) is made of a ferromagnetic material.

2. An improved screw according to claim 1, wherein the openings at the top and bottom of the groove (222) are provided with a bevelled flaring structure (2221).

3. An improved screw according to claim 1, wherein a ring of convex ring (2112) is formed on the periphery of the cross-shaped groove (2111) on the upper surface of the nut (211), and the whole section of the outer wall of the convex ring (2112) is provided with an external thread (21121);

an internal thread (223) is formed after the inner wall of the bottom of the cover body part (22) is recessed, the internal thread (223) can be screwed with the external thread (21121) of the convex ring (2112), and the length of the thread sections of the internal thread and the external thread is consistent.

4. An improved screwdriver comprises a screwdriver handle (11) and a screwdriver rod (12) connected with the screwdriver handle (11) into a whole, wherein a cross screwdriver head (121) is arranged at one end, away from the screwdriver handle (11), of the screwdriver rod (12), the cross screwdriver head (121) comprises four petal parts (1211), the four petal parts (1211) are arranged in a cross shape and are used for being embedded into cross grooves of screws, and the improved screwdriver is characterized in that a sheet body (1212) is formed on the outer surface of each petal part (1211);

wherein, the center of the cross cutter head (121) is provided with an elongated and cylindrical strip-shaped groove (1213), the top of the strip-shaped groove (1213) is closed, the bottom of the strip-shaped groove extends to the bottom surface of the cross cutter head (121), and an opening is formed on the bottom surface; a spring (1214) and an elongated round rod (1215) are arranged in the strip-shaped groove (1213); the spring (1214) is positioned above the round rod (1215), the top end of the spring (1214) is propped against the top wall of the strip-shaped groove (1213), and the bottom end of the spring (1214) is propped against the top of the round rod (1215); the bottom of the round rod (1215) extends out of the strip-shaped groove (1213), the round rod (1215) is limited and cannot fall out of the strip-shaped groove (1213), and the round rod (1215) can be completely retracted into the strip-shaped groove (1213) when moving towards the direction of the compression spring (1214);

and, when the blade (1212) of the screwdriver (1) is inserted into the lowest point of the slot (222) of the cover (22) in claim 1, at this time, the bottom of the round rod (1215) extends into the cross recess (2111) of the screw (2) in claim 1 and abuts against the bottom surface of the cross recess (2111), and at this time, the spring (1214) is in a natural state.

5. An improved screwdriver according to claim 4, wherein the strip-shaped groove (1213) is provided with an arc-shaped flaring transition section (12131) at a position closer to the bottom opening, the strip-shaped groove (1213) at the side of the arc-shaped flaring transition section (12131) away from the opening has a larger inner diameter, and the strip-shaped groove (1213) at the side close to the opening has a smaller inner diameter;

the outer wall of the round rod (1215) is provided with a circle of cambered convex parts (12151) of the outer drum, and the maximum height of the convex parts (12151) does not exceed 2.5 mm; the round bar (1215) is prevented from falling out of the slot (1213) by the engagement of the arcuate projection (12151) with the arcuate flared transition section (12131).

6. The improved screwdriver as recited in any of claims 4 or 5, wherein said blade (1212) has a height of between 2mm and 8mm, a length of between 2mm and 5mm, and a width of between 1.5mm and 3.5 mm.