KR101400956B1 - The structure of screwdriver set use very small screw - Google Patents

Abstract

Disclosed is a structure of a set screwdriver having a subminiature nib to tighten or loosen a subminiature screw used for jewelry or high-priced articles. A rotating cap which is the uppermost part of the screw driver has a body insertion part which is formed at the lower part and has an annular stepped jaw and an annular protrusion. A main body which is a hand grip of the screw driver has three spaces formed in the circular direction, a hexagonal external shape on the plane, a vertex which is formed at the lower part and is suddenly narrowed, finger wings formed integrally with both sides of the outside of the vertex to allow a user to grasp them with the thumb and the index finger, and a connection rod which is connected to the middle of the vertex in a vertical direction and has a hexagonal hole to allow the user to connect or separate a kit. Four kits for tightening or loosening a screw form one set and have the same length, and each of the kits includes a hexagonal shaft which is a body of the kit, a small recess formed in one side thereof and a spring mounted on the small recess to elastically act a subminiature ball. The shaft has four kits having a ′-′-shaped nib formed at one side and a ′+′-shaped nib formed at the other side, wherein one kit is always connected to the connection rod and the other three kits are stored in the three respective spaces, such that the kits can be replaced according to standards of the screw and allow the user to focus force with the thumb and the index finger.

Description

[0002] The structure of a miniature or used set screwdriver is shown in FIG.

The present invention relates to a structure of a miniature or used set screwdriver for providing a miniature or used set screwdriver structure to be used conveniently when assembling or disassembling a screw used in a precision machine such as a clock, Specifically, the final step of tightening the miniature screw used in a precision machine or the miniature screw that is fastened can concentrate the force of the thumb and index finger at the initial stage of disassembly, finger wings, and screwing or disassembling screws Miniature kit or set screwdriver having a collection structure in which the kit can be stored so as not to be lost and can be taken out and used.

Screwdriver is a set screwdriver that can be used in all industrial and technical fields such as electric, electronic and power machinery, or even a robot or small wristwatch. A tool used to tie or pull (unscrew) the tool; screw, and screw, as mentioned above, all the parts in electrical, electronic and power machinery or robots, small wrist watches and ultra precision medical machines and products developed and used in all industrial fields, Unlike a bolt, when assembled or disassembled to be a finished product, the tip is sharply configured so that it can be used without a nut.

In addition, the screw nails described above can be tightened or loosened by a screwdriver, unlike bolts / nuts, which are generally tightened or loosened by using a wrench. Such screw nails are used in almost all countries where industrial technology is used And various screwdrivers which can be used together have been developed and used.

If you look at the types of screw nails for a moment, you can see that the drill can be used to drill holes in the drilled hole. +, - shaped flat head, +, - shaped dish head, +, - shaped round head, +, Self-screw, which is made from the above-mentioned kinds of head, head, +, - type reverse osmosis head, but which can be fastened while drilling a hole directly without drilling by a drill; The surface of the shaft is dented or protruded according to the object, and the materials and dimensions thereof are various. Therefore, it is required to be small and precise like a computer, a portable telephone, a watch, and an eyeglass, Are so small that the screw that tightens or loosens these screw nails is very small and thin and even the nib portion of the tip is sharp.

On the other hand, the set screwdriver as described above is generally known as a driver that can be used only by manual operation, not by electric power, and is known to the public as a screw driver for repairing a watch or repairing a pair of glasses.

In addition, although the set screwdriver used as described above is not known as a ball screwdriver, it can not be found that the screwdriver is used as a manual screwdriver. However, The present invention relates to a screwdriver having mutually interchangeable bits and is disclosed in U.S. Patent Nos. 4,552,043; 4,552,044; 4,463,788; No. 4,716,795 and No. 4,716,796, which are incorporated herein by reference in their entirety. These patents relate to a knob having a central longitudinal axis, a selector cup rotatably mounted on the end of the knob to rotate about the central longitudinal axis, The use of a hand tool consisting of a number of objects (e.g., bits) arranged approximately circularly about an axis of a handle about a circumference of a portion is described.

Each bit has a hexagonal cross section and extends substantially parallel to the handle axis and is disposed in the handle portion. A chuck for fixing the non-rotatable bit end using the bit end is provided at the end of the handle portion in alignment with the handle axis .

A slot elongate radially outwardly from the middle of the selector bar end to the bit position within the handle, and the selector barrel can rotate such that the slot coincides with any bit in the handle, Which walls are sufficiently far away from the handle to be able to pull outwardly in a direction approximately parallel to the handle axis through the slot and means for retaining the selected tool bit in the selector barrel are provided.

The bit end moves toward the selector cylinder center to align with the chuck along the slot and can be inserted into the chuck, wherein the handle has a plurality of channels for receiving a corresponding plurality of bits. Each channel has a means for interacting with each bit when the bit is removed from the channel to maintain alignment with the bit in the handle, each bit being in contact with the corresponding hexagonal wall portion of said channel Said means for retaining the selected tool bit in the selector barrel comprises a locking device rotatably mounted within the end of the selector barrel, the locking device comprising a selector cylinder A slot corresponding to the shape and size of the elongate slot at the end is formed and a substantially U-shaped inner sleeve extending toward the chuck is formed through the selector sleeve, and the inner sleeve also accommodates the bit head A hexagonal surface is formed which guides the corresponding hexagonal surface of the bit head and the physiological bit head to the chuck The locking device is such that when the bit head is inserted into the chuck, the hexagonal surface of the inner sleeve is displaced from the corresponding surface of the bit head, the inner sleeve forming the locking device and a part thereof is fixed to a fixed chuck having a hexagonal surface The hexagonal bit head portion overlapping each hexagonal face of the inner sleeve so that the hexagonal faces of the inner sleeve and the bit head no longer align with each other, And prevents the deviation of the bit head from the magnetic head.

The multi-purpose hand tool includes a handle portion having a bit selector barrel installed at a lower end thereof. The upper end of the handle portion surrounds a lid having a stub portion fixed to the cavity portion. The lid may be permanently secured to seal the cavity, or a detachable catch may be used between the cavity wall and the stub so that the lid can be removed to store various items in the cavity.

In addition, the outer surface of the lid may be provided with means for attaching a collar, a strap, etc., or a logo or other personal identification table may be displayed, and the ring is accompanied by a visual representation of the shape of the bits stored within each channel . The ring is particularly preferably constructed as a separable element which can be exchanged easily during manufacture so as to accommodate a combination of a number of bits of different shapes and further by forming the ring into a separator from the rest of the handle, For example, even when a new ring is manufactured with the necessary symbols to represent the wheel, it is not necessary to mold a new mold for the handle, but only the mold for the ring itself is formed.

The handle has a plurality of channels formed therein, and all of the channels are elongated in a direction parallel to the central axis line of the handle. The channels are generally arranged in a circle around the central axis of the handle. The channel forms a bit magazine in the handle so that a number of bits are carried by the handle. According to a particular embodiment, six channels are formed in the periphery of the handle and thus six differently shaped bits may be provided for selective use of the device.

Each channel is configured to accommodate a corresponding hexagonal shape of the enlarged bit head. The channel thus has a plurality of recesses with an inner surface for receiving the corresponding outwardly projecting outer surface of the hexagonal bit head and the upper body of the handle comprises an opening in one of the recess surfaces at the periphery of the handle, Thereby providing an opening for exposing the shaft. The rotatable selector cylinder has elongated slots provided in the cylinder load subwall.

The slots are arranged side by side in the selected bit axis so that the bits can be pulled out of the channel in the direction of the arrows, whereas according to a further improvement of the invention on the prior art screwdriver, the locking device comprises an annular Which is rotatably mounted on the barrel. The ridge has a lip portion for securing engagement into the groove. The locking device has a slot formed therein corresponding to the shape and size of the slot at the end of the barrel.

The locking device is provided with a ridge at the periphery to rotate relative to the barrel and to facilitate handling. The locking device is generally U-shaped and consists of an inner sleeve portion having an inner hexagonal surface adapted to cooperate with the surfaces of the bit head.

In operation, the slot of the barrel aligns with a predetermined one of the channels so that the working end of the selected bit is moved out of the handle portion, the locking device is rotated to the open position where the slots coincide and the protrusion of the hex- The bit is drawn from the channel to the barrel until it contacts the inner wall.

The bit is slid along the mutually matched slots to interdigitate with the inner wall of the sleeve while the bit head is not constrained to the channel and a portion of the inner sleeve portion is cut to correspond in the barrel lower wall of the selector barrel when in the open position To form recesses or slots that are constrained by walls contacting the wall.

As soon as the locking device is rotated, however, the peripheral portion of the inner sleeve portion contacts another portion of the wall of the barrel to prevent the locking device from further rotating relative to the barrel, and the walls of the inner sleeve portion Aligned with the corresponding walls of the chuck as well as the walls, and the bit head is inserted into the chuck and firmly engaged.

Finally, the locking device is rotated by 90 [deg.] From the corresponding surface of the bit head of the hexagonal surface of the inner sleeve, so that the protrusion of the hexagonal surface comes into contact with the new opposing surface of the inner sleeve, The selected bit is fixed in the chuck.

In addition, the improved locking device makes it possible to use a cylindrical shank bit, unlike prior art bits, which have a generally rectangular cross-section as disclosed by U.S. Patent No. 4,552,044, by means of an improved locking device. The production of such circular cross-section bits is much cheaper in cost than the rectangular bits of the prior art.

However, although the above-mentioned selection name has a cavity portion, the cavity portion here is merely a depth of one groove formed inside the center of the handle, and the lid is provided only with the function of blocking the cavity portion, It can be understood that it is a structure that can not be applied to a miniature screwdriver.

Even when applied to a miniature screwdriver, as already known, since the grip portion has a simple cylindrical shaft-like structure, when the selection name is applied to a micro screwdriver, as in the conventional miniature screwdriver currently used, For example, when a worker concentrates and applies a force in the process of final tightening of a minute screw of a watch or an eyeglass frame, or in the process of separating a fastened screw, the force can not be applied intensively, There occurs a phenomenon that the surface or slip occurs, causing a problem that the screw head groove is worn or slipped and the watch or glasses are damaged.

In addition, the cavity formed inside the vertical part of the handle can store one or several kits (beats) as one space. However, since several kits are stored in one space, the rattle noise Which causes a problem to be caused by a person who consciously concentrates and works so as to disturb the person.

Not only that, but the selection name has a lid on the handle, which can only be used to close the cavity and not provide a rotor function, so it can not be used smoothly in a fast turn.

The present invention provides a screwdriver for screwing or unscrewing a screw having a very small size, wherein the main body is a screwdriver capable of using a thumb and index finger, a thumb and a finger, The material is formed of a synthetic resin material.

Meanwhile, the main body formed of the synthetic resin has a vertically narrowed bottom portion that is sharply narrowed, and a metal connecting rod having a vertical hexagonal groove is insert-molded, and a hollow portion is formed do.

A holder having a partition wall is inserted into the hollow portion of the hollow portion so that the kit can be separated and stored in three spaces. A rotation cap is provided on the upper portion of the main body having the holder to induce free rotation and quick rotation, do.

The kit may have a hexagonal shape in cross section, a groove may be formed at the center of one side of the hexagonal shaft, a micro-sized intermittent ball may be elastically provided by a spring, both sides of the hexagonal shaft may be formed with a sharp- The four kits are different in size with a "shaped" and a "+" shaped tip, one is always connected to the hexagonal groove, the other three are stored in three spaces formed by the holders, When assembling or disassembling eyeglasses and smart phones including watches, scratches such as scratches on watches, glasses, and smart phones; so as to achieve the object of the work without generating scratches.

According to an aspect of the present invention, there is provided a screw driver (a so-called needle driver) for use in tightening or loosening a very small screw having a very small size (usually a needle driver) The main body is formed with a diameter of 15 mm or less, and a hollow portion, which is one space, is formed in the body, three wings are formed in a triangular shape in the longitudinal direction in the hollow portion, An insert in which a holder having a central axis of the holder is inserted and coupled to form three spaces in the longitudinal direction and a connecting rod having a deep hexagonal groove formed in the axial direction on the lower stem of the main body into a main body and a body; And the kit can be used as a substitute for the linkage.

In addition, in the present invention, a groove is formed at the center of one side of the hexagonal axis in the cross section, and a spring is inserted. The micro-intermittent ball is resiliently provided and both sides of the shaft are formed with an abruptly tapered extension. The kit consists of four kits with different sizes of '+' type to provide driver kits for miniature screws of different sizes.

In addition, the present invention is characterized in that the main body is freely rotatable in the left and right direction, and a smooth rotation cap is formed, so that the screwdriver can be conveniently used and operated quickly when the screw is tightened or loosened.

In addition, the present invention enables a convenient and quick operation when assembling or disassembling eyeglasses and a smart phone including a clock, and particularly, when disassembling or assembling a luxury watch or smart phone or glasses having a high value or a very high price, The touch point is prevented from slipping off the thread embedded in the product, so that it is possible to prevent the problem that scratches (scratch) occurs in a product that requires handling attention, such as a clock, a smart phone, or an eyeglass.

Therefore, according to the present invention, when a product required for handling is broken, the person who carries out the repair is less likely to be scratched by his / her product, and the person who is requested to repair can quickly and conveniently work safely .

The present invention provides the effect of effectively storing the micro-miniature driver kit having different sizes by preventing the micro-miniature driver kit from being lost.

In addition, the present invention provides a main body having a structure in which a main body is formed of a synthetic resin, and a connecting rod formed of a metal having a different material is insert-molded so that the main body can be easily gripped and used .

 In addition, the present invention can concentrate a great deal of force on the screwdriver when tightening or tightening the small screw by using a wing blade on both sides of the main body lower part, so that the operation kit or the screw slips on the screw, Thereby effectively preventing the problem of damaging products such as glasses.

In addition, the present invention is characterized in that four kinds of kits differing in size are provided, each of which has a sharp tip on one side of the hexagonal axis in the cross section and one end surface in the shape of '-' It is possible to reduce the cost of purchasing a tool by providing a kit having a cross section of a star with a star (?) Shape or a square (?) Or other special shape, and at the same time, It is possible to improve the convenience and efficiency of the work that can be solved or solved.

In addition, since the present invention is capable of rotating left and right on the upper portion of the main body and forming a smooth rotation cap

When the screw is tightened or loosened, the main body is rotated while holding the screwdriver with the palm of the hand, so that the work can be performed easily and quickly.

In addition, the present invention not only enables a convenient and quick operation when assembling or disassembling glasses including a watch, a smart phone, and the like, but also, in particular, in disassembling or assembling an expensive luxury watch, smart phone or glasses, It is possible to block the occurrence of scratches at a source, and when a product requiring handling is broken, the person entrusting the repair will be less likely to be scratched by his or her product, The person who is commissioned can provide the effect of making the work quickly, conveniently and safely.

Figure 1 is a perspective view of a screw driver &
2 is a front view illustrating a state in which a rotating cap and a main body are separated from each other,
Figure 3a is an exemplary cross-sectional view of the inventive screw driver in its entirety;
Fig. 3B is a cross-sectional view
FIG. 4 is a cross-sectional view of the main body of the screwdriver taken along line A-A 'shown in FIG.
FIG. 5 is a cross-sectional view of a connecting rod viewed from the direction of line B-B 'shown in FIG.
6A is a front view of the holder of the present invention
6B is an exemplary sectional view of the holder viewed in the direction of line C-C 'shown in FIG. 6A

Hereinafter, the present invention will be described in detail with reference to the drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the terms described below are defined in consideration of functions in the present invention, and this may vary depending on a user, an operator's intention or custom.

Therefore, it goes without saying that the definition should be based on the contents throughout this specification.

In the meantime, in describing the cross-sectional shape of the nib of the screwdriver according to the present invention, for the sake of convenience of explanation, it is described as '-' shape or '+' shape, but only '-' shape and '+' , But it does not include star (☆) or quadrangle (□) or hexagonal nib.

1 is a perspective view of a screwdriver according to the present invention in which a rotary cap 100, a main body 200, a linkage 300 and a driver kit 500 are combined. FIG. 2 is a cross- FIG. 3A is a cross-sectional view showing the entire structure of the screwdriver according to the present invention. FIG. 3A is a cross-sectional view of the screwdriver according to the present invention, 3B is a side view of the main body 200 and the connecting part 300 of the rotating cap 100 according to the present invention. FIG. 4 is a cross-sectional view of the main body of the screwdriver taken along the line A-A 'shown in FIG. 3 (a), in which the holder 400 are connected to the inner hollow portion 201 of the main body 200, The relationship between the space 201a formed by the holder 400 inserted into the space 201a and the driver kit 500 stored in the space 201a is shown in FIG. 6A is a front view of the holder 400 of the present invention, and FIG. 6B is a cross-sectional view of the holder 300 shown in FIG. 6A. 400 ', which is a cross-sectional view taken along the line C-C' in FIG.

Hereinafter, the present invention will be described in detail. 1 is a perspective view of a screwdriver according to the present invention in which a screw driver is constructed by combining a rotary cap 100, a main body 200, a linkage 300, and a driver kit 500 Able to know.

[Rotating Cap (100)]

1, the rotary cap 100 is a lid that is coupled to an upper portion of the main body 200 and is freely rotatable in forward and reverse directions in the main body 200, And a body insertion portion 105 is provided below the step 104. The body insertion portion 105 is formed in a rectangular shape.

On the other hand, on the outer circumference of the upper part of the upper part, which is larger than the lower part, the slip prevention grooves 102 are formed at regular intervals so as not to slip in the palm grasping when the operator grips and applies force, A concave depression 103 is formed.

The rotary cap 100 is configured such that when the upper part of the rotary cap 100 is easily grasped and held in the palm of the hand, the lower part connected to the main body 100, And the lower end of the curved surface 101 is formed with a body insertion portion 105 which is fitted to the main body 200 to be coupled therewith.

In the intermediate portion of the body insertion portion 105, a rotation protrusion 106 is provided at an intermediate portion of the body insertion portion 105 to prevent the rotation cap 100 from being naturally separated from the main body 200 while being engaged with the main body 200, And four notches 107 are formed in the vertical direction along the circular direction.

When the rotary cap 100 is coupled to the main body 200 or when the rotary cap 100 is separated from the main body 200, the cutout portion 107 elastically acts inward and outward to facilitate disassembly and coupling, In a state in which the rotation body 106 is engaged with the body 200, the rotation body 106 is naturally pulled out unless it is intentionally pulled in a state of being fitted in the groove 202 formed on the upper side of the hollow portion 201 of the main body 200 It is possible to maintain the state in which the turning cap 100 is coupled to the main body 200. As a result,

3A and 3B, the rotation guide groove 108 is formed at the center of the vertical direction so that the upper end of the holder center shaft 402 can be inserted to induce the rotation And a stretchable space 109 is formed inside the cutout 107 along the circular direction.

The expansion and contraction space 109 is formed in such a manner that when the body insertion portion 105 is fitted into or separated from the hollow portion 201 of the main body 200, the diameter of the projection portion 106 is smaller than the inner peripheral diameter of the hollow portion 201 When the body insertion portion 105 is fitted in the hollow portion 201, the space for the shingling action of the depression portion 106 is provided while the body insertion portion 105 is once inserted into the hollow portion 201 The rotation projecting portion 106 is restored to its original position in the contracted state instantaneously when the rotation projecting portion 106 coincides with the projecting groove 202 and the rotation projecting portion 106 is fitted to the projecting groove 202 so as not to be separated.

The upper end of the holder center shaft 402 inserted into the hollow portion 201 is inserted into the rotation guide groove 108 formed at the center of the body insertion portion 105 .

Therefore, in the state where the rotary cap 100 is coupled to the main body 200, the rotary cap 100 and the main body 200 are configured such that the rotation projecting portion 106 is rotated from the rotation groove 202 to the holder central axis 402, Can freely rotate in directions opposite to each other while being guided by the rotation guide groove 108.

[Main Body (200)]

The main body 200 is a component of a handle of a screwdriver. As shown in FIGS. 1 to 4, the main body 200 has a lower portion formed with a sharply narrowing cap 203 And a flat wing 204 formed integrally is formed on the outer side of the cock 203.

In this case, the main body 200 is formed by injection molding with a synthetic resin material. The body surface is hexagonal, and an empty hollow portion 201 is formed therein as illustrated in FIG. 3A, A circular groove 202 is formed in the upper surface of the upper portion so that the rotation protrusion 106 formed on the body insertion portion 105 of the rotary cap 100 is fitted and rotationally guided as described above, The hollow space 201 is formed with three spaces 201a into which the holder 400 having three partition walls 401 is inserted to store the three kits 500 therein.

[Links (300)]

As shown in FIGS. 3A and 5, the connecting rod 300 includes a deep hexagonal groove 301 which can be inserted into and detached from the kit 500, The kit 500 can be engaged or disengaged by inserting inserts at the center of the vertex of the nipple 203 so that a part of the entire length of the connecting rod 300 protrudes to the outside.

[Holder (400)]

6A and 6B, the holder 400 is formed in the longitudinal direction with respect to the holder center axis 402, and the partition 400 is formed in three directions with respect to the holder center axis 402 in plan view And protrusions 403 are formed at the upper end of the barrier ribs 401.

The formed holder 400 is inserted into the hollow portion 201 formed in the main body 200 in the longitudinal direction so as to separate the three kits 500 and store three spaces 201a therein .

[Kit (500)]

The kit 500 is a tool that is fitted in a '-' groove or a '+' groove formed in the head of a screw to tighten or loosen the screw. The outer shape of the shaft 501 is hexagonal A small groove b 'is formed at the center of one side of the shaft 501 so that the miniature intermittent ball b is resiliently mounted by a spring and both ends of the shaft 501 are provided with pin portions 502a And a pin 503a is formed at one end of one of the pin portions 502a and a pin 503a is formed at the end of the other pin portion 502b. (Not shown).

In addition, when the rotary cap 100 is separated, the holder 400 is inserted into the hollow portion of the main body 200, (201).

More specifically, the rotary cap 100 is pushed in a state in which the lower portion of the holder 400 is aligned with the hollow portion 201 of the separated main body 200, and then a slight force is applied to the upper end portion of the holder central axis 402 And press.

The entire partition 401 of the holder 400 is inserted into the hollow portion 201 of the main body 100 and the protrusion 403 formed at the upper end of the partition 401 is inserted into the hollow portion 201 of the main body 100, And is inserted into the upper groove 202 of the lower arm 201.

The holder 400 is coupled with the main body 200 by one body so that the holder 400 is not separated from the hollow portion 201 even when the main body 200 is turned upside down, The holder 400 forms three spaces 201a in one hollow portion 201 of the cylinder.

One of the four kits 500 is left in the three spaces 201a and the remaining three kits 500 are left in the space 201a. Insert one by one.

After the above operation, the rotary cap 100 is coupled to the body insertion portion 105. More specifically, when the lower end of the body insertion portion 105 formed at the lower portion of the rotary cap 100 is pressed against the upper end of the upper hollow portion 201 of the main body 200, Is inserted into the space 201, The combination is complete with the sound of sound. Sound is sound that is caught in the groove 202 while the annular projection 106 is contracted and restored to its original position in the course of insertion of the body insertion portion 105 into the hollow portion 201. Meanwhile, The upper end of the central shaft 402 flows into the rotation guide groove 108 so that the main body 200 having the rotary cap 100 and the three kits 500 stored therein is completed, The rotation shaft 106 is guided by the groove 202 and the holder center shaft 402 is guided by the rotation guide groove 108 while the rotation shaft 106 is fully engaged with the main body 200, The cap 100 and the main body 200 can be freely rotated.

When the rotary cap 100 is pulled in the reverse order of the coupling, when the kit 500 is stored in the three spaces 201a, 300 can be replaced with the kit 500 of FIG.

Following this, three kits 500 are stored one by one in the three spaces 201a, and the remaining one kit 500 is inserted into the hexagonal groove 301 of the link 300 to engage with each other.

On the other hand, when coupling the kit 500 to the connection block 300, the selection of which of the two pin portions 502a and 502b is to be inserted into the hexagonal groove 301 of the connection block 300 is now either tightened or loosened The other direction is inserted into the hexagonal groove 301 of the connector 300 so that a direction to be used for the operation protrudes to the outside depending on whether the screw head has a shape of '-' or '+'.

In the process of inserting the selected one of the two pin portions 502a and 502b into the hexagonal groove 301 of the connecting rod 300, The intermittent ball b is pushed inward in the groove b 'while compressing the spring (not shown), and the end face of the intermittent ball b is brought into close contact with the inner surface of the hexagonal groove 301 with a strong force of the compressed spring .

Therefore, the kit in a state in which the coupling is completed is maintained in the engaged state without detaching from the connecting rod. When the kit in the retained coupled state is to be separated again, the kit is taken out in the reverse order The screw driver of the present invention, such as the above-described fire prevention, can be provided with a size that allows the main body, which is the handle, to be easily gripped in the hand and applied with force, In particular, it is possible to push the upper surface of the rotating cap firmly with the palm while grasping in the palm of the hand, and at the same time, the thumb and index finger tightly tilt the swinging wing in the rotating direction The structure that can be used is an expensive case using a micro screw , Eyeglasses, smart phone, etc., the '-' shape or '+' shaped tip slips during the operation, thereby damaging the screw head groove or scratching or scratching the expensive product. It is possible to effectively prevent and prevent problems such as

Rotating cap: 100 Surface: 101
Slip-proof groove: 102 Depressions: 103
Step: 104 Body insert: 105
Circumferential part: 106 Cutaway part: 107
Rotating guide groove: 108 Elastic space: 109
Main body: 200 Hollow section: 201
Space: 201a groove: 202
Taps: 203 Wings: 204
Connections: 300 Hexagon groove: 301
Holder: 400 barrier wall: 401
Holder center axis: 402 protrusion: 403
Kit: 500 Axis: 501
Fin portions 502a and 502b: 503a and 503b
Controlled ball: b Home: b '

Claims (2)

1. A screwdriver having a very small diameter that can fasten or loosen a very small screw used in a noble metal or an expensive product,
The rotating cap, which is the uppermost portion of the screwdriver, forms a body insertion portion having an annular step and a round hole at the lower portion. The main body, which is a handle of the screwdriver, has three spaces along the circular direction, And the lower part of which is formed into a hexagonal shape. The lower part of the cap forms a sharpened tip. On both outer sides of the cap there are integrally formed wings for use as a thumb and forefinger, and a connecting hexagon having a deep hexagonal groove The kit is composed of four sets, each of which is formed to have the same length. The axis of the body is formed into a hexagonal shape, A small groove is formed, and then a micro-intermittent ball is provided by a spring so as to be able to act elastically, and the shaft is provided with a "-" Four kits with a "+" shaped tip on the opposite side to form a nib are provided, one kit is always coupled to the linkage and the other three kits are stored in the three spaces provided Which can be used to replace the kit according to the standard of the screw and to concentrate the force by using the thumb and index finger. The method according to claim 1,
The rotary cap, which is the uppermost part of the screwdriver, is formed with a recessed depression and a non-slip groove which are wider than the lower part and can apply a force so that the palm of a worker is not slippery, and a curved surface is formed between the upper part and the lower part, And the lower part of the annular step is formed vertically in the circular direction of the body insertion part having the four notches and the rotation guide groove for facilitating the contracting action of the annular part and the round part in which the intermittent action and the rotational action are performed, The main body, which is coupled to the rotary cap and serves as a handle, forms a cylindrical hollow portion to which the body insertion portion is coupled. The outer shape of the main hollow portion is a hexagonal shape in plan view. A ring groove to be rotatable is formed in the upper part of the hollow part, and a lower part forms a sharply narrowed cap The outer part of the entire length of the connecting rod having a deep hexagonal groove that can be engaged or detached by inserting the kit, And a holder having three partitions having a holder central axis and a projection in a radial triangular direction about the holder central axis are formed and inserted into the hollow to form three And the screw shaft is formed into a hexagonal shape and then a small groove is formed at the center of one of the surfaces of the body, The ball is provided so as to be capable of resiliently acting, and both ends of the shaft are provided with pin portions whose diameters are drastically reduced, Four kits with a "nib" and a "+" cantilever on the other side are made up, one kit is always connected to the connecting rod, and the other three kits are stored in the above three spaces Which can be used to replace the kit according to the screw specification and to concentrate the force by using the thumb and index finger.

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