Anti-drop screwdriver head

Abstract

The application discloses a kind of anti-falling screwdriver head, including connecting rod and the plug-in portion of gradually contracting radial dimension, at least one cross section V-shaped groove structure is arranged on the interval of the circumferential outer wall of plug-in portion, the two side walls of the groove structure and the axis of plug-in portion respectively form first included angle and second included angle in opposite directions, and the first included angle and second included angle are all greater than 0 °, the application makes that the included angle between the groove side wall of screwdriver head and the pattern slot side wall of screwdriver head is formed, interference between the two is generated, axial stop structure is formed, so that screwdriver head is inserted into the pattern slot of screw head, and it is not easy to be taken out from the pattern slot of screw head portion, and then when locking screw, when not pressing screw downward or the insufficient pressing force, screwdriver head will be because offset angle and screw bite more closely, avoid damaging the pattern slot of screw head.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of hardware tools, in particular to a kind of anti-drop screwdriver head. BACKGROUND

[0002] Screwdriver head is often used in hardware tools to lock screw, when using electric tool, because screwdriver head rotates at high speed, it needs to press screwdriver head to make it tightly inserted in the pattern slot of screw head when locking screw, if screwdriver head is not pressed or the pressing force is not enough during locking screw, it will cause screwdriver head and the pattern slot of screw head to separate, which will cause the damage of the pattern slot of screw, and it may also cause the screw to be thrown out, causing personal injury. SUMMARY

[0003] In order to make up for the above shortcomings, the present application provides an anti-drop screwdriver head, which will be caught in the pattern slot of screw head when locking screw, preventing screwdriver head from separating from screw head.

[0004] The technical scheme adopted by the present application to solve the technical problem is: an anti-drop screwdriver head, comprising a connecting rod and a plug-in part with gradually shrinking radial size, at least one V-shaped groove structure is arranged on the outer wall of the plug-in part, the two side walls of the groove structure form first and second angles with the axis of the plug-in part in opposite directions, and both the first and second angles are greater than 0°.

[0005] As a further improvement of the present application, the two side walls of the groove structure are symmetrically arranged along the axis of the plug-in part.

[0006] As a further improvement of the present application, the first and second angles formed by the two side walls of the groove structure with the axis of the plug-in part are both 2.5°.

[0007] As a further improvement of the present application, the surfaces of the two side walls of the groove structure are both convex arc surface structures.

[0008] As a further improvement of the present application, the two side walls of the groove structure form helical arc surfaces in opposite directions.

[0009] As a further improvement of the present application, the groove part between the two side walls of the groove structure is connected through a round corner.

[0010] As a further improvement of the present application, the plug-in part comprises a cylindrical segment and a conical frustum segment, one end of the cylindrical segment is connected to the connecting rod through a conical surface, the other end of the cylindrical segment is aligned with one end of the conical frustum segment with larger diameter, and the groove structure extends from the end of the conical frustum segment with smaller diameter to the root of the cylindrical segment near the connecting rod.

[0011] As a further improvement of the present application, the connecting rod is in a prismatic structure, and a circular inner recessed clamping groove is formed on the outer circumferential wall of the connecting rod at the end opposite to the plug-in portion.

[0012] As a further improvement of the present application, the grooves on the outer circumferential wall of the plug-in portion are arranged in a cross pattern.

[0013] The present application has the following advantages: the two side walls of the groove structure of the screwdriver head are inclined to extend in opposite directions along the axial direction of the plug-in portion, so that an angle is formed between the side walls of the groove structure and the side walls of the patterned insertion slot of the screwdriver head, and interference is generated therebetween to form an axial stop structure. After the screwdriver head is inserted into the patterned insertion slot of the screw head, it is not easy to be pulled out of the patterned insertion slot of the screw head. When the screw is locked and the screw is not pressed downward or the pressing force is insufficient, the screwdriver head will be engaged with the screw more tightly due to the offset angle, so as to avoid damaging the patterned insertion slot of the screw head. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective view of the present application;

[0015] Figure 2 is a front view of the present application;

[0016] Figure 3 is an enlarged view of the left side of the present application;

[0017] Figure 4 is a right side view of the present application. DETAILED DESCRIPTION

[0018] Embodiment: A screwdriver head preventing from falling off includes a connecting rod 1 and a plug-in portion 2 with a gradually shrinking radial dimension, and at least one groove structure 3 with a V-shaped cross section is arranged on the outer circumferential wall of the plug-in portion 2 at intervals, characterized in that the two side walls of the groove structure 3 form a first angle 4 and a second angle 5 in opposite directions with the axis of the plug-in portion 2, and the first angle 4 and the second angle 5 are both greater than 0°.

[0019] In the process, the two knives are used to process the groove structure 3 on one side and the other side. Since the two side walls of the groove structure 3 do not extend along the axis of the plug part 2, the roots of the two side walls of the groove structure 3 close to the bottom of the groove structure 3 form a V-shaped structure, and the opening direction of the V-shaped structure is towards the connecting rod 1. The two side walls of the groove structure 3 form an included angle with the side walls of the screw head groove. When the plug part 2 of the screwdriver head is inserted into the pattern slot of the screw head, the two side walls of the groove structure 3 on the screwdriver head form a small interference with the two side walls of the pattern slot of the screw head. As the screwdriver head rotates, the two side walls of the groove structure 3 on the screwdriver head will cause a slight deformation on the side walls of the pattern slot of the screw head, and then the plug part 2 of the screwdriver head is locked, forming an axial blocking, and then an axial stop positioning structure is formed between the screwdriver head and the screw head during the screw locking process, so that the plug part 2 of the screwdriver head cannot be separated from the pattern slot of the screw head, and the anti-dropping effect is achieved.

[0020] The two side walls of the groove structure 3 are symmetrically arranged along the axis of the plug part 2.

[0021] The first included angle 4 and the second included angle 5 formed by the two side walls of the groove structure 3 and the axis of the plug part 2 are both 2.5°, that is, the included angle between the two side walls of the groove structure 3 is 5°. In addition, the included angle between the two side walls of the groove structure 3 can also be other angles, such as 3°, 6°, 8°, etc. This is an equivalent replacement structure that can be easily thought of by those skilled in the art based on the patent, except for structures within the scope of the patent.

[0022] The surfaces of the two side walls of the groove structure 3 are convex arc surfaces. When inserted into the pattern slot of the screw head, they are in close contact with the side walls of the pattern slot of the screw head.

[0023] The two side walls of the groove structure 3 respectively form helical arc surfaces with opposite rotation directions. This structure can be used to form a stop positioning when the screwdriver head is rotated and inserted into the side walls of the pattern slot of the screw head.

[0024] The groove between the two side walls of the groove structure 3 is connected by a rounded corner.

[0025] The plug part 2 includes a cylindrical segment and a conical frustum segment. One end of the cylindrical segment is connected to the connecting rod 1 through a conical surface, and the other end of the cylindrical segment is connected to the end of the conical frustum segment with a larger diameter. The groove structure 3 extends from the end of the conical frustum segment with a smaller diameter to the root of the cylindrical segment close to the connecting rod 1.

[0026] The connecting rod 1 is a prismatic structure, and a circular annular recessed slot 6 is formed on the outer circumferential wall of the end of the connecting rod 1 away from the plug part 2.

[0027] The groove structures 3 on the circumferential outer wall of the plug part 2 are arranged in a cross pattern. Other patterns are also possible, such as a hexagonal pattern, a square pattern, a plum blossom pattern, etc.

Claims

1. A screwdriver head that prevents falling off, comprising a connecting rod (1) and a plug portion (2) with a gradually shrinking radial dimension, wherein at least one groove structure (3) with a V-shaped cross section is provided at intervals on the outer circumferential wall of the plug portion, characterized in that: The two side walls of the groove structure and the axis of the plug portion form a first angle and a second angle in opposite directions respectively, and the first angle (4) and the second angle (5) are both greater than 0°. The two side walls of the groove structure (3) form a V-shaped structure near the root of the bottom surface of the groove structure (3), and the opening direction of the V-shaped structure is toward the direction of the connecting rod (1). The two side walls of the groove structure (3) of this structure form an angle with the side walls of the groove of the screw head. In this way, when the plug portion (2) of the screwdriver head is inserted into the flower-shaped slot of the screw head, the two side walls of the groove structure (3) on the screwdriver head and the two side walls of the flower-shaped slot of the screw head form a small interference. As the screwdriver head rotates, the two side walls of the groove structure (3) on the screwdriver head will cause a slight deformation on the side walls of the flower-shaped slot of the screw head, and then get stuck with the plug portion (2) of the screwdriver head to form an axial obstruction.

2. The anti-drop screwdriver bit according to claim 1, characterized in that: The groove portions between the two side walls of the groove structure are connected by a rounded transition.

3. The anti-drop screwdriver bit according to claim 1, characterized in that: The plug portion includes a cylindrical section and a frustum section. One end of the cylindrical section is connected to the connecting rod through a conical surface transition, and the other end of the cylindrical section is aligned and connected to the end with a larger diameter of the frustum section. The groove structure extends from the end with a smaller diameter of the frustum section to the root of the cylindrical section near one end of the connecting rod.

4. The anti-drop screwdriver bit according to claim 1, characterized in that: The connecting rod is a prismatic structure, and a circle of annular concave grooves (6) are formed on the outer circumferential wall of one end of the connecting rod facing away from the plug portion.

5. The anti-drop screwdriver bit according to claim 1, characterized in that: The groove structures on the outer circumferential wall of the plug portion are arranged at intervals to form a cross shape.

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