GB2531876A

GB2531876A - Design method for screwdriver

Info

Publication number: GB2531876A
Application number: GB1514355.5A
Authority: GB
Inventors: Zhu Gong
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-08-24
Filing date: 2015-08-13
Publication date: 2016-05-04
Also published as: IE20150238A1; CN104149061A; AU2015100396A4; IES86673B2; CN104149061B; GB201514354D0; CN105690311A; IE20150236A1; IES20150251A2; IES20150250A2; IES86728B2; GB2531875A; GB201514355D0; AU2015100397A4

Abstract

A design method for a screwdriver comprising providing a handle 1, a toolbar/shaft and tool bit and further comprising providing a stopping sleeve 2 wherein the stopping sleeve 2 is mounted around the toolbar and free to slide along the toolbar, using a limit recess/groove 3 provided near the bit end of the toolbar to keep the stopping sleeve from sliding off the end of the toolbar, providing that the stopping sleeve projects a certain distance further than the tool bit when the stopping sleeve is engaged with the limit recess, and using magnets provided in the handle and stopping sleeve to retain the stopping sleeve at the upper end of the toolbar.

Description

Design method for screwdriver

Field of the Invention

The invention relates to hardware tools, especially to a design method for the screwdriver.

Description of prior art

A screwdriver comprises a handle, a tool bar, a tool bit, and the tool bit is magnetic. It is needed to disassemble products during the overhaul of products, inserting the screwdriver into the mounting hole to unscrew the screw, after unscrewing of the screw, the screws go out of the mounting io hole together with the tool bit because of the magnetic force between the screw and the tool bit, when the overhaul is done, it is needed to replace the screw into the mounting hole so as to screw it. The often case is that the crew with the spring washer and the flat washer is unscrewed, both washers are usually separated from the screw, such that both washers are needed to is replace to the screw and then inserted into the mounting hole to be fastened. The steps of both replacements of the screw into the mounting hole and the washers into the screw to be replaced into the mounting hole increase the working time and the cost.

Summary of the present invention

The object of the invention is to provide a design method for the screwdriver so as to solve the above problem. The screwdriver has the function of eliminating the step of replacing the screw into the mounting hole or replacing the spring and flat washers to the screw to be replaced into the mounting hole, that is, the screw is still left in the mounting hole after unscrewing.

In the following, the technical solution will be described.

Providing a handle, a tool bar and a tool bit to the screwdriver; arranging a first holder to the head portion of the handle; arranging a limit recess proximate the tool bit to the tool bar; providing a stopping sleeve, which is penetrated by the tool bar and moves freely along the tool bar; producing magnetic force between the first holder and the stopping io sleeve to keep the stopping sleeve at the totally retracted position; using a limit recess to keep the stopping sleeve at the totally stretched out position and not to get out of the tool bar; providing a certain distance projected by the stopping sleeve from the tool bit when the stopping sleeve is in the totally stretched out position.

is The second object of the invention is to provide a design method for the screwdriver, the stopping sleeve do not get out of the tool bar during the normal use, the stopping sleeve keeps the screw in the mounting hole only when needed.

zo In the following, the technical solution will be described.

providing a shell defining the shape to the stopping sleeve; arranging a through bore having a loose fit with the tool bar, a limit block cooperating with the limit recess, a second holder interacted with the first holder and a projecting part interacted with the screws head inside the 25 shell; arranging the projecting part close to the tool bit coaxially with the tool bar; arranging the second holder proximate the handle; arranging a undirectional limit to the limit block.

Providing an arrangement to achieve the undirectional limit.

Arranging a stopping surface vertical to the tool bar and close to the tool bit, a communicated surface vertical to the tool bar and close to the handle, a tilted surface connecting the communicated surface and the stopping surface to the limit block; directing the tilted surface towards the handle; io pressing the tool bar under the elastic force all along by the limit block; arranging a slope cooperating with the tilted surface proximate the root portion of the handle to the limit recess.

If the screw is not needed to be left in the mounting hole, the stopping is sleeve is kept at the totally retracted position, which can be achieved by the following arrangements.

Arrangement one.

Arranging the first holder to be magnetic, of which the pole surface is 20 vertical to the tool bar; arranging the second holder to be a member with magnetic conductibility.

Arrangement two.

Arranging the second holder to be magnetic, of which the pole surface is vertical or parallel or slant to the tool bar.

arranging the first holder to be a member with magnetic conductibility.

The third object of the invention is to provide a design method for the screwdriver, the stopping thereof has a friendly assemblability. In the following, the technical solution will be described.

Making the shell up of two same half shells arranged up and down; providing a projecting claw hook to the half shell, arranging a non-circular bore for receiving the claw hook to the radially symmetric position of the claw hook; arranging a first vertical portion parallel to the body of the claw hook, a 1.0 second vertical portion parallel to and staggered with the first vertical portion and a horizontal portion vertical to the first and second vertical portion to the non-circular bore; arranging the hook portion of the claw hook to hook the horizontal portion.

Arranging a first pit for receiving the limit block and the spring, and a second pit for receiving the second holder to the half shell, arranging a narrow portion and a wide portion to the first pit; defining the depth of the insertion of the limit block into the limit zo recess by a stair formed by the narrow portion and the wide portion; making the depth of the insertion of the limit block into the limit recess to be the depth of the insertion of the tilted surface of the limit block into the limit recess.

Moving the stopping sleeve to the outlet of the mounting hole so as to keep the screw separated from the tool bit and to keep the screw remained in the mounting hole by the projecting part of the stopping sleeve, thus the step of replacing the screw into the mounting hole is saved, or the step of replacing the spring and flat washers to the screw to be replaced into the mounting hole is saved, so the working time and the cost is reduced.

s Brief description of the drawing

In the following, the invention will be described in greater detail by means of some embodiments with reference to the accompanying drawings, in which Fig.1 is a 3d-drawing of the screwdriver of the invention; io Fig.2 is an exploded 3d-drawing of Fig.1; Fig.3 is a 3d-drawing of the stopping sleeve in Fig.1; Fig.4 is an exploded 3d-drawing of Fig.3; Fig.5 is a 3d-drawing of the stopping sleeve in Fig.4; Fig.6 is s sectional view of Fig.3 along A-a direction; is Fig.7 is a drawing of the screwdriver, wherein the stopping sleeve is at the totally stretched out position; Fig.8 is a drawing of the screwdriver, wherein the stopping sleeve is at the totally retracted position; Fig.9 is a detailed view of the part I in the Fig.6; zo Fig.10 is a detailed view of the part IV in the Fig.8; Fig.11 is a front view of the limit block; Fig.12 is a detailed view of the part II in the Fig.8; Fig.13 is a detailed view of the part III in the Fig.9; Fig.14 is a 3d-drawing of the screwdriver waiting to disassemble the screw; zs Fig.15 is a 3d-drawing of the screwdriver unscrews the screw; Fig.16 is a 3d-drawing of the screwdriver, wherein the stopping sleeve is to keep the screw retained in the mounting hole and the tool bit is not totally out of the mounting hole; Fig.17 is a 3d-drawing of the screwdriver, wherein the screw is kept in the mounting hole and the tool bit is out of the mounting hole; Fig.18 is a 3d-drawing of the screwdriver, wherein the screw is kept in the mounting hole and the stopping sleeve is at the totally stretched out position; Fig.19 is a 3d-drawing of the screwdriver, wherein the stopping sleeve is to return to the totally retracted position.

1. the first holder; 2. the stopping sleeve; 3. the limit recess; 20. the through bore; 21. the half shell; 22. the second holder; 23. the limit block; 24. the spring; 25. the second pit; 26. the first pit; 27. the claw hook; 28. the non-circular bore; 29. the projecting part; 30. the first vertical portion; 31. the second vertical portion; 32. the horizontal portion; is 33. the stopping surface; 34. the communicated surface; 35. the tilted surface; 36. the wall; 37. the slope.

Detailed description of the preferred embodiment

Referring to Fig.1 and Fig.2, a cross screwdriver comprises a handle, a tool bar and a tool bit, the head portion of the handle arranges a first holder, a limit recess is arranged proximate the tool bit to the tool bar, a stopping sleeve penetrated by the tool bar moves freely along the tool bar, the stopping sleeve is kept at the totally retracted position (see Fig.8) by the magnetic force produced between the first holder and the stopping sleeve.

To avoid the wear and loosing of the first holder caused by the frequent crash between the stopping sleeve and the first holder, the first holder is arranged to be studded in the handle, the first holder do not project from the head portion of the handle. The limit recess is arranged to keep the stopping sleeve at the totally stretched out position and not to get out of the tool bar, the stopping sleeve projecting a certain distance from the tool bit when the stopping sleeve is in the totally stretched out position (see s Fig.7).

Referring to Fig.3 to Fig.5, the stopping sleeve has a cylindrical configuration, and comprises a shell defining the shape, inside the shell arranges a through bore having a loose fit with the tool bar, a limit block cooperating with the io limit recess, a second holder interacted with the first holder and a projecting part interacted with the screw head. The projecting part close to the tool bit is arranged coaxially with the tool bar, the second holder is disposed proximate the handle, the limit block has a undirectional limit, the tail portion of the limit block cooperates with the helical compression is spring.

The shell comprises two same half shells arranged up and down, the half shell comprises a first pit for receiving the limit block and the spring, and a second pit for receiving the second holder. The first pit comprises a narrow portion and a wide portion, a stair formed by the narrow portion and the wide portion defines the depth of the insertion of the limit block into the limit recess.

Referring to Fig.6 and Fig.9, the half shell is provided with a projecting claw 25 hook, a non-circular bore for receiving the claw hook is arranged to the radially symmetric position of the claw hook, the non-circular bore comprises a first vertical portion parallel to the body of the claw hook, a second vertical portion parallel to and staggered with the first vertical portion, a horizontal portion vertical to the first and second vertical portion, the hook portion of the claw hook hooks the horizontal portion. The width of first vertical portion is greater than the width of the claw hook so as to 5 avoid the sticking caused by the distortion when the claw hook inserting into the first vertical portion, a certain distance is arranged between the side wall of the second vertical portion and the claw hook so as to easily make mold and disassemble the claw hook, inserting the tool into the second vertical portion to push the hook portion of the claw hook out of the io horizontal portion, such that the fastening function of the claw hook is released, so the easy assembling is achieved.

Fig.7 is a drawing of the screwdriver, wherein the stopping sleeve is at the totally stretched out position, and one half shell is hidden. The stopping is sleeve is kept at the totally stretched out position and do not get out of the tool bar, even the stopping sleeve is exerted a force directing from the handle to the tool bit, which is caused by the undirctional limit of the limit block, the stopping sleeve projects a certain distance from the tool bit when the stopping sleeve is at the totally stretched out position.

The undirectional limit is achieved by the cooperation between the limit block and the limit recess. Specifically, referring to Fig.11, the limit block comprises a stopping surface vertical to the tool bar and close to the tool bit, a communicated surface vertical to the tool bar and close to the handle, a tilted surface connecting the communicated surface and the stopping surface; the tilted surface directs towards the handle, the tilted surface is arranged to be arc surface so as to increase the reliability of the sliding, the limit block presses the tool bar under the elastic force all along from the helical compression spring. Referring to Fig.10, the limit recess comprises a wall vertical to the tool bar, the wall cooperates with the stopping surface of the limit block, a slope cooperating with the tilted surface is arranged proximate the root portion of the handle to the limit recess.

Referring to Fig.12, when the limit block slides above the limit recess along the tool bar, the limit block slides quickly into the limit recess due to the elastic force produced by the helical compression spring located at the tail io portion of the limit block. Due to the limit effect of the stair of the first pit, the depth of the insertion of the limit block into the limit recess is the depth of the insertion of the tilted surface of the limit block into the limit recess. The stopping sleeve continues driving the limit block sliding till the stopping surface of the limit block touches the wall of the limit recess, the stopping is sleeve is limited in the limit recess not to continue sliding to the tool bit, even the stopping sleeve is exerted a force directing from the handle to the tool bit. When a force directing from the tool bit to the handle is exerted to the stopping sleeve, which drives the limit block sliding towards the handle, when the arc surface of the limit block touches the slope located at the root of the limit recess, both two slide with respect to each other, the limit block is forced to overcome the elastic force to move radially outwardly, the arc surface of the limit block moves to the tool bar with the help of the slope of the limit recess (see Fig.13), the stopping sleeve continues sliding towards the handle till the stopping sleeve touches the handle (see Fig.8), because the first holder is magnetic, of which the pole surface is vertical to the tool bar, and the second holder is a member with magnetic conductibility, the first and second holder make the stopping sleeve stay at the totally retracted position through the effect of the magnetic field. Obviously, there are another some manners to produce a magnetic field between the first and second holder, such as that the second holder is arranged to be magnetic, of which the pole surface is vertical or slant to the tool bar and the first holder is arranged to be a member with magnetic conductibility, such arrangement can also keep the stopping sleeve stay at the totally retracted position; such as that the second holder is arranged to be magnetic, of which the pole surface is parallel to the tool bar, that is the pole surface faces the tool bar, which is a member with magnetic conductibility, such arrangement produces a magnetic field between the second holder and the tool bar, such that the stopping sleeve can stop at any position on the tool bar, including the totally retracted position.

Fig.14 to Fig.19 show the application of the screwdriver.

is Inserting the tool bit into the mounting hole to unscrew the screw, the screw is attached to the tool bit and moves outwardly together with the tool bit, the stopping sleeve slides towards the tool bit and touches the external side of the mounting hole and the projecting part of the stopping sleeve inserts into the mounting hole before the tool bit moves out of the mounting hole, keeping moving the tool bit outwardly, the tool bar slides with respect to the stopping sleeve, while the stopping sleeve is motionless at the external side of the mounting hole, when the limit recess slides to the limit block, that is the stopping sleeve is at the totally stretched out position, the stopping sleeve projects a certain distance from the tool bit at the position where the stooping sleeve is at totally stretched out position, so the screw is separated from the tool bit and is kept to stay in the mounting hole by the projecting part of the stopping sleeve, taking the screwdriver away to finish the screw assembling, in order to make the next assembling easy, returning the stopping sleeve to the handle, that is the stopping sleeve is at the totally retracted position.