CN103231341A - Hand-pressed self-rotation type screwdriver - Google Patents

Abstract

A hand-pressed self-rotating screwdriver, including a one-way mechanism, a ball screw mechanism, a reset mechanism, a lower shell/an upper shell and an organic sleeve; the one-way mechanism has an inner pipe, a limit guide, A pair of steel balls, a lower spring and a rear gland; the ball screw mechanism includes a screw and a pair of steel balls; the reset mechanism includes two springs; pressing the rear gland and the screw can force the screw to perform a helical movement relative to the shell, thereby This achieves the effect of tightening or unloading the screws; after the pressure is removed, the reset mechanism can force each mechanism to reset; when tightening the screws, the present invention only needs to do a squeezing action, which saves time and is convenient.

Description

Self-twisting screwdriver

technical field

The invention relates to a screwdriver, in particular to a hand-pressed self-rotating screwdriver which has a long service life, is easy to disassemble, converts pressure into rotary motion, has a long stroke, and the screw rod can be automatically translated and reset after the compression stroke ends.

Background technique

In the prior art, the commonly used screwdriver for loading and unloading screws can only rotate half a circle at a time, and the speed is very slow.

In the past, there was a left-handed screwdriver and a right-handed screwdriver, but their practicability still lacked. Although the screwdriver can drive the screw to rotate quickly, the stroke is short due to the large diameter of the screw of the ball screw mechanism. In addition, when the compression stroke of the screwdriver ends, it needs to be rotated in the opposite direction to return to the initial working position. In the actual use process, the waiting time is long, and it is easy to get stuck, which is very inconvenient.

In the past, there were electric screwdrivers, but electric screwdrivers are generally large in size and require an external power supply, so they are not suitable for use in many occasions.

Contents of the invention

The purpose of the present invention is to provide a hand-pressed self-rotating screwdriver that has a long service life, is easy to disassemble, does not require an external power supply, converts pressure into rotational motion, has a relatively long stroke, and automatically resets the screw after the compression stroke ends.

The invention provides a hand-pressed self-rotating screwdriver, which includes a one-way mechanism, a ball screw mechanism, a reset mechanism, a lower shell, an upper shell and an organic sleeve;

The one-way mechanism has an inner pipe, a position-limiting conduit, a pair of steel balls, a lower spring and a rear gland. In the shell, the limiting conduit is sleeved in the middle hole of the lower part of the inner pipe fitting. The limiting conduit has a steel ball seat hole, and the steel ball seat hole of the limiting conduit and the inclined guide surface of the inner pipe fitting correspond to each other and cover a pair of steel balls. The lower spring of the one-way mechanism is arranged between the position-limiting guide and the middle hole at the bottom of the inner pipe. The spring bounces upward, and the upper part of the rear gland has a trapezoidal boss, which is stuck on the upper part of the upper shell, and the lower part of the rear gland has an inner groove;

The working position of the ball screw mechanism is set inside the limit guide, including a screw and a pair of steel balls;

The reset mechanism includes two springs, which are arranged inside the inner pipe, the lower spring bounces against the inner pipe and the limit guide, and the upper spring bounces against the rear gland and the screw;

The lower shell is in the shape of a tapered tube as a whole, and the upper part is provided with external threads, which can be connected with the internal threads of the lower part of the upper shell. A bit groove, which clamps the lower part of the limit guide tube, and the lower part of the lower shell has a tapered protrusion, and there is a guide hole for the screw rod to protrude;

The upper shell is in the shape of a tapered tube as a whole, and a stepped hole is provided on the upper part of the upper shell for the rear gland to limit the position. The thread is threadedly connected with the upper part of the lower shell.

In the hand-pressed self-rotating screwdriver of the present invention, there is a positioning protrusion on the outer periphery of the lower part of the inner pipe, and a chute inside the lower casing. The positioning protrusion of the inner pipe is embedded in the chute of the lower casing, and the inner pipe can only be opposite to the lower casing Swipe up and down.

In the hand-pressed self-rotating screwdriver described in the present invention, there is a positioning protrusion on the outer periphery of the upper part of the limiting guide tube, and there is a chute corresponding to the inside of the inner tube. Can slide up and down relative to the inner pipe.

In the hand-pressed self-rotating screwdriver of the present invention, the connecting thread of the upper shell and the lower shell is a triangular thread, which has better self-locking property.

The screw thread of the present invention is a symmetrically arranged double thread. The lower part of the cross-sectional shape of the thread is a circular arc with the same radius as the steel ball, and the upper part is an oblique straight line tangent to the circular arc. This cross-sectional shape can make: in the working process, The screw fits well with the ball; in reset, the screw pushes the ball to the sides.

In the present invention, the rear gland slides down after receiving the pressure of the palm, and the inner pipe is pressed to slide down. When the inclined guide surface at the bottom of the inner pipe is pressed down, the steel ball will move into the steel ball seat holes on both sides of the limiting conduit. Embedded in the threaded track of the screw, the inclined guide surface at the bottom of the inner pipe, the steel ball bearing holes on both sides of the limit guide tube and the steel balls are linked to produce a closing effect, allowing the ball screw mechanism to work. When the screw is under pressure, it can only move upwards in a spiral .

In the present invention, after the pressure applied to the screw disappears, the pressure on the rear gland is released at the same time, the spring of the reset mechanism starts to work, the lower spring lifts the inner pipe and the rear gland, and the upper spring pushes the screw down. When the screw goes down, the steel ball in the one-way mechanism is pushed away along the thread slope, and the steel ball slides to the steel ball seat hole of the limit guide tube and the space left after the inner pipe is raised, and the screw is no longer restricted by the steel ball. Under the action of the upper spring, the translation returns to the initial working position.

The invention can be quickly disassembled, and damaged parts can be quickly replaced.

In the present invention, the thread of the screw rod is made left-handed or right-handed, so as to correspond to two occasions of screw tightening and screw removal respectively.

In the present invention, the words "tight" and "loose" are engraved on the screw rod by laser, indicating that it is used for tightening or dismounting.

In the present invention, a notch is marked on the outer circumference of the lower part of the lower casing, corresponding to the narrow side of the screwdriver bit, for the user to quickly determine the initial working position of the screw.

The beneficial effect of the present invention is that: when the screw is subjected to upward pressure, the rear gland, the inner pipe fitting, the limiting conduit, the steel ball and the screw thread section of a specific shape are set by the one-way mechanism, so that the screw rotates upward; Finally, through the action of the reset mechanism and the one-way mechanism, the screw is quickly moved down and reset; the upper and lower shells are connected by triangular threads, which have a good self-locking effect, and are convenient for disassembly and replacement of parts; the upper and lower shells The shape is conical and tubular, and the organic cover and the upper shell are bonded together. The shape formed is conducive to the user's hand holding the screwdriver. This shape is conducive to providing working pressure during work and is comfortable to use; the words "loose" and "tight" are marked And notch, which can be convenient for users to use; the screw is equipped with a set of screwdriver heads to realize quick replacement and multi-purpose functions.

Description of drawings

Fig. 1 is an exploded view of the hand-pressed self-rotating screwdriver of the present invention;

Fig. 2 is the cross-sectional view of the initial working state of the hand-pressed self-rotating screwdriver of the present invention;

Fig. 3 is a partial enlarged view of the sectional view of the above-mentioned initial working state;

Fig. 4 is a cross-sectional view of the hand-pressed self-rotating screwdriver of the present invention at the maximum stroke;

Fig. 5 is a partial enlarged view of the sectional view at the maximum stroke position;

Fig. 6 is a sectional view of a certain position during the reset process of the hand-pressed self-rotating screwdriver of the present invention;

Fig. 7 is a partially enlarged view of a section view of a certain position in the above-mentioned reset process;

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

Referring to Fig. 1, the various parts of the hand-pressed self-rotating screwdriver of the present invention include an upper shell 1, an inner pipe fitting 2, a position-limiting conduit 3, a lower spring 4, a lower shell 5, a screw rod 6, a rear pressure Cover 7, a pair of steel balls 8, an upper spring 9 and an organic casing 10.

Referring to FIG. 2 and FIG. 3 , the hand-pressed self-rotating screwdriver is in the initial working state at this time, and in this state, most of the screw rod 6 protrudes out of the shell 5 . The hand-pressed self-rotating screwdriver includes an upper housing 1, a lower housing 5, a one-way mechanism, a ball screw mechanism and a reset mechanism. The one-way mechanism has an inner pipe 2, a limit guide 3, a pair of steel balls 8, a lower spring 4 and a rear gland 7. The lower end of the inner pipe 2 is set in the lower shell 5, and the lower bottom has an inclined guide surface 22 , the upper end is sleeved in the upper casing 1, and the position-limiting conduit 3 is set in the middle hole of the lower part of the inner pipe fitting 2. The position-limiting conduit 3 has a steel ball seat hole 32, and the steel ball seat hole 32 of the position-limiting conduit and the oblique inner pipe fitting The guide surface 22 covers a pair of steel balls 8 corresponding to each other. The lower spring 4 of the one-way mechanism is arranged between the position-limiting guide 3 and the middle hole at the bottom of the inner pipe 2. The upper end of the limit-stop guide 3 is elastic by the lower spring 4. Pressing, the lower end is pushed against the inner groove of the lower shell 5, the inner pipe part 2 is bounced upward by the lower spring 4, and the rear gland 7 has a trapezoidal boss on the top. The rear gland 7 slides down after receiving the pressure of the palm, pressing the inner pipe fitting 2 to slide down, when the inclined guide surface 22 at the bottom of the inner pipe fitting 2 is pressed down, the steel ball 8 will move into the steel ball seat holes 32 on both sides of the limiting conduit 3, Embedded in the threaded track 61 of the screw rod 6, the inclined guide surface 22 at the bottom of the inner pipe fitting, the steel ball seat holes 32 on both sides of the limit guide tube and the steel ball 8 are interlocked to produce a closing effect, allowing the ball screw mechanism to function. When the screw rod 6 is under pressure , can only produce spiral motion.

Referring to FIG. 4 and FIG. 5 , the hand-pressed self-rotating screwdriver reaches its maximum stroke position from the initial working position, and the screw rod 6 is basically inside the casing 5 . Then referring to Fig. 6 and Fig. 7, after the pressure applied on the screw rod 6 disappears, the pressure on the rear gland 7 is released simultaneously, and the spring of the reset mechanism starts to work, and the lower spring 4 pushes the inner pipe part 2 and the rear gland 7 against each other. When the screw rod 6 goes down, the steel ball 8 in the one-way mechanism is pushed away along the threaded slope 61, and the steel ball 8 slides to the steel ball seat hole 32 of the position-limiting conduit 3 and the inner pipe piece 2 rises. In the space left behind, the screw rod 6 is no longer restricted by the steel balls, and directly returns to the initial working position in translation under the downward elastic force of the upper spring 9.

Referring to Fig. 3, Fig. 5 and Fig. 7, there is a positioning protrusion 21 on the outer periphery of the lower part of the inner pipe fitting 2, and there is a chute inside the lower casing 5, and the positioning protrusion 21 of the inner pipe fitting 2 is embedded in the chute of the lower casing 5, and the inner pipe fitting 2 is only It can slide up and down relative to the lower shell 5 . There is a positioning protrusion 31 on the outer periphery of the upper part of the limiting conduit 3, and there is a chute corresponding to the inside of the inner pipe fitting 2. The positioning protrusion 31 of the limiting conduit 3 is embedded in the chute of the inner pipe fitting 2, and the limiting conduit 3 can only slide up and down relative to the inner pipe fitting 2 .

Referring to FIG. 3 , the connecting thread 51 of the upper shell 1 and the lower shell 5 is a triangular thread, which has better self-locking property.

Referring to Fig. 3 and Fig. 7, the thread 62 of the screw rod 6 is a symmetrically arranged double thread. The lower part of the cross-sectional shape of the thread is an arc with the same radius as the steel ball, and the upper part is an oblique line tangent to the arc. This cross-sectional shape can make: During the working process, the screw rod 6 cooperates well with the steel ball 8; during reset, the screw rod 6 pushes the steel ball 8 to both sides.

Claims (7)

1. A hand-pressed self-rotating screwdriver, which includes an upper housing (1), a lower housing (5), a one-way mechanism, a ball screw mechanism and a reset mechanism, characterized in that: The one-way mechanism includes an inner pipe (2), a limit guide (3), a pair of steel balls (8), a lower spring (4) and a rear gland (7), and the lower end of the inner pipe (2) is sleeved on the lower shell (5), the lower bottom is provided with an inclined guide surface (22), the upper end of the inner pipe (2) is sleeved in the upper shell (1), and the limit guide (3) is sleeved on the lower part of the inner pipe (2) In the middle hole, the limiting conduit (3) is provided with a steel ball seat hole (32), and a pair of steel balls ( 8), the lower spring (4) is arranged between the limiting conduit (3) and the middle hole at the bottom of the inner pipe (2), the upper end of the limiting conduit (3) is elastically pressed by the lower spring (4), The lower end rests in the inner groove of the lower housing (5), and the inner pipe (2) is pushed upward by the lower spring (4). The upper part of the rear gland (7) has a trapezoidal boss, which is stuck on the upper The upper part of the casing (1), and the lower part of the rear gland (7) has an inner groove; The working position of the ball screw mechanism is set inside the limit conduit (3), including a screw (6) and the pair of steel balls (8); The reset mechanism includes two springs, which are arranged inside the inner pipe (2), the lower spring (4) bounces against the inner pipe (2) and the limit guide (3), and the upper spring (9) bounces against the rear gland (7) and screw (6); The lower casing (5) is in the shape of a conical tube as a whole, and the upper part is provided with a triangular external thread (51), which can be connected with the internal thread of the lower part of the upper casing (1). The upper part of the lower casing (5) is provided with an inner hole, which At the lower part of the inner pipe fitting (2), there is a limit groove at the bottom of the inner hole, which is stuck on the lower part of the limit guide tube (3), and there is a tapered protrusion at the lower part of the lower casing (5), and there is a guide hole for the screw rod (6) to extend out; The upper casing (1) is in the shape of a tapered tube as a whole, and a step hole is provided on the upper part of the upper casing (1) for the rear gland (7) to limit the position. The upper casing (1) is covered with an organic sleeve (10). The shell (1) is glued together with the organic sleeve (10), and the lower part of the upper shell (1) has an internal thread, which is threadedly connected with the upper part of the lower shell (5). 2. The hand-pressed self-rotating screwdriver according to claim 1, characterized in that: there is a positioning protrusion (21) on the outer periphery of the lower part of the inner pipe (2), and there is a chute inside the lower shell (5), and the inner pipe (2) ) is embedded in the chute of the lower shell (5), so that the inner pipe (2) can only slide up and down relative to the lower shell (5). 3. The hand-pressed self-rotating screwdriver according to claim 1, characterized in that: there is a positioning protrusion (31) on the outer periphery of the upper part of the limit guide (3), and there is a chute inside the inner pipe (2), and the limit guide The positioning protrusion of (3) is embedded in the chute of the inner pipe fitting (2), and the limiting conduit (3) can only slide up and down relative to the inner pipe fitting (2). 4. The hand-pressed self-rotating screwdriver according to claim 1, characterized in that: the connecting threads (51) of the upper shell (1) and the lower shell (5) are triangular threads, which have better self-locking properties. 5. The hand-pressed self-rotating screwdriver according to claim 1, characterized in that: the threads of the screw (6) are symmetrically arranged double threads, and the lower part of the cross-sectional shape of the threads is an arc with the same radius as the steel ball (8) , the upper part is an oblique straight line tangent to the arc. This cross-sectional shape can make: during the working process, the screw rod (6) cooperates well with the steel ball (8); during reset, the screw rod (6) pushes the steel ball (8) to the sides. 6. The hand-pressed self-rotating screwdriver according to claim 1, characterized in that: the thread of the screw rod (6) can be made to be left-handed or right-handed, so as to be suitable for two occasions of screw tightening and screw removal respectively. 7. The hand-pressed self-rotating screwdriver according to claim 1, characterized in that: the upper casing (1) is covered with an organic cover (10), and the organic cover (10) is made of soft organic material, and the inner surface and the upper The shell (1) is bonded and fixed together, and the outer surface is rough to keep good friction with the user's hand.

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