CN2620613Y

CN2620613Y - Adjustable screw driver

Info

Publication number: CN2620613Y
Application number: CN 03234244
Authority: CN
Inventors: 李春林
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-28
Filing date: 2003-04-28
Publication date: 2004-06-16
Anticipated expiration: 2013-04-28

Abstract

The utility model relates to a screwdriver which gears can be shifted, and belongs to a screw tightening tool. The utility model is composed of a handle, a screwdriver rod arranged on the handle, and a screwdriver head arranged in the screwdriver groove of the lower end of the screwdriver rod, the key point is that two single direction overrunning clutches which rotate reversely are arranged in the handle; a clutch sliding sleeve is arranged on the screwdriver rod, and then arranged in the handle with the clutch; force applying arms are arranged on the both sides of the handle. When being used, according to the requirements of the screw screwing and unscrewing, the matching state of the clutch and the screwdriver rod is selected, thus enabling the screwdriver rod not to be rotated reversely during the use, avoiding the incorrect operation; and the utility model can be shifted into an empty gear, the clutch sliding cover can be entwisted rapidly by the hands, thereby enhancing the working efficiency of a screw in the loosening state.

Description

But the screwdriver of gear shift

The utility model belongs to a kind of improvement technology of screwdriver.

General screwdriver is made of handle and the driver bit that is fixed on handle, at its lower end usually, and driver bit has the in-line edge of a knife of flat, and the cross edge of a knife is also arranged.Just can satisfy the instructions for use of common wood screw.Add the anti-lost drop structure of houselights, clamping or magnetic in order to adapt to using and prevent dropping of screw under the varying environment condition, to have, the technology such as product that the multiple model driver bit that differs in size can be installed on a handle are arranged.Their function and structure respectively have it to stress, and have all solved the weak point that general screwdriver exists.And when using screwdriver to tighten or unscrew a screw usually, it is careless slightly that regular meeting occurs, and screwdriver rotates afterburning phenomenon round about, causes operational trouble.Can withdraw from as will screw a screw time and drop, maloperation such as can be screwed in the time of withdrawing from a screw.The handle inconvenience that is general screwdriver in addition is afterburning, and as becoming flexible and withdraw from a fastening especially screw, can not increase active force crucial moment suddenly, have to multi-pass operation, and cause the screw head of a nail to damage at last and it can't be taken out.Secondly, the screw no matter general screwdriver is applied is in loose still tensioning state, all rotates large diameter handle to the screw reinforcing, is unfavorable for that when the screw relaxed state fast rotational improves work efficiency.

The technical problems to be solved in the utility model is when a kind of gear control structure of increase on the basis of existing screwdriver makes in operation, backwards rotation can not take place in knife bar, avoid maloperation, can select little moment fast rotational and the afterburning two kinds of duties of big moment according to the screw tightness simultaneously; Its handle has afterburning structure, but can satisfy the screwdriver of the unexpected afterburning gear shift that requires in using.

The scheme that solves the problems of the technologies described above is as follows:

But a kind of screwdriver of gear shift, by handle, be installed in the knife bar on the handle, the interior driver bit of cutter head groove that is installed in the knife bar lower end constitutes, key is the mono-directional overrun clutch that two switched in opposite are installed in handle, be set with the clutch sliding sleeve on the knife bar, be installed to again in the handle of band clutch; Also be equipped with in the handle both sides and add the arm of force.

Further scheme is to have three gear fixing holes on the clutch sliding sleeve, and fixedly hoodle of a gear corresponding with the gear fixing hole is installed on knife bar.The part that is on the clutch sliding sleeve in the clutch inner chamber is manufactured with the boss that makes clutch generation clutch action.On knife bar and clutch sliding sleeve, be in two clutch contacts site and be manufactured with corresponding bar shaped positioning spline and positioning key.Be used to guarantee three gear fixing holes on the clutch sliding sleeve when sliding up and down, with gear on the knife bar fixedly pearl coincide, play and determine the gear effect.Knife bar is rotatably installed in the hole at intracavity of handle top.Be manufactured with a hexagon cutter head groove in addition in the lower end of knife bar, be used to select the driver bit that is fit to requirement is installed, but so just constitute the screwdriver of a gear shift.Can slide over sliding up and down on the knife bar with clutch according to the instructions for use that screws or withdraw from during use, select corresponding gear, realize that the reverse movement of operating grip is surmounted from control, or not avoid maloperation the knife bar effect to screw.

The utility model has the advantages that the mono-directional overrun clutch that two direction of rotation have been installed in intracavity of handle, by be installed in clutch sliding sleeve on the knife bar, in the fixedly cooperation of three gear fixing holes on pearl, the clutch sliding sleeve of the gear of installing on the knife bar, can realize easily in operation screwdriver left-handed only or only dextrorotation or about all rotatable three kinds of modes of operation, adapted to the operation requirement of different operating object.Because the selection and the control of gear have been arranged, make screwdriver that two rotating torques be arranged, the one, when the clutch sliding sleeve is had an effect with any one one-way clutch, need with handle the screw reinforcing, be in big moment duty, rotating speed is also slow relatively, is used for fasteningly maybe will becoming flexible very firm screw.The 2nd, when the clutch sliding sleeve was in neutral position, available hand rubbing ground the clutch sliding sleeve, is in little moment duty, was used for being under the loose condition at screw using, and increased rotating speed and improved work efficiency.Installed two on handle top in addition and added the arm of force, made when hanging up gear, can be afterburning suddenly, joint is finished loosening or the special firmly requirement of tighten the screws nail.Easy to operate, avoid maloperation.Also can be according to the cutter groove shape on the screw head of a nail, select for use in-line cutter head or cross cutter head to be installed in the cutter head groove of knife bar lower end flexibly and satisfy instructions for use.

Fig. 1, the utility model profile stereogram.

Cavity shape structure and add installation site and the mode schematic diagram of the arm of force on handle when Fig. 2, handle are inverted.

Fig. 3, two mono-directional overrun clutch shape schematic diagrames.

Fig. 4, freewheel clutch are installed in the positioning key shape schematic diagram in the intracavity of handle.

Fig. 5, clutch sliding sleeve shape and structural representation.

Fig. 6, knife bar shape and structural representation.

Fig. 7, knife bar of the present utility model, clutch sliding sleeve, freewheel clutch mounting means and the structural representation in handle.

Below in conjunction with accompanying drawing,, scheme of the present utility model is described further as an embodiment.

With reference to Fig. 1,7, the utility model is made of critical pieces such as handle 6, knife bar 1, driver bits 8.Two vertical with handle arm of forces 4 that add are installed on handle 6, after the top cover of knife bar 1 is loaded onto clutch sliding sleeve 3, are installed in the intracavity of handle.Driver bit 8 is installed in the cutter head groove of knife bar bottom.Can change the driver bit 8 of different edge of a knife shapes as required installs and uses.Have three gear fixing holes 2 on the clutch sliding sleeve 3 and select for using, stretch out outside the hole of top of chamber in handle 6 the knife bar upper end, fixes and make itself and handle 6 to constitute with snap ring 5 and be rotationally connected.Gear fixedly pearl 7 is withstood in the gear fixing hole 2 on the clutch sliding sleeve 3 by the spring of its bottom.

With reference to Fig. 2, two on the handle 6 add the arm of force 4 and also are manufactured with cavity 16, open two installation screws 12 that add the arm of force 4 on the same diameter line of handle wall, add the arm of force 4 with screw 9 with two and are installed on handle 6 outer walls.Intracavity of handle 11 is divided into two parts by the internal diameter size size, the bottom internal diameter is bigger than top internal diameter, forms a step that two clutches are installed, and is the cavity of a band keyway 10, keyway 10 is used for two freewheel clutch fixed-site, and handle 6 drives clutch and its synchronization action when rotating; Top 13 internal diameters are slightly little, and main effect is to make the clutch sliding sleeve on the knife bar to have and moves the space that forms neutral gear on one, makes knife bar not controlled by handle, fast rotational freely about energy.At intracavity of handle top 15 a littler through hole 14 is arranged, be used to make the knife bar topmost just to pass, on 15 outer walls of top, add snap ring, knife bar is installed in knife bar location and rotation.

With reference to Fig. 3,4, freewheel clutch 20 is commercially available product, as the miniature clutch that uses in the duplicator, can only one-directional rotation.The needle roller 19 of six roots of sensation one-directional rotation is installed on the internal chamber wall, six clamp bar slots 17 are arranged on the outer wall, the bottom is an annular plastics pad 21 that prevents that needle roller from deviating from.The two suitable for reading 18 coincide, and the draw-in groove 17 on the outer wall communicates, and when being installed in the intracavity of handle, only needs arbitrary draw-in groove 17 to connection to aim at the keyway 10 of cavity walls in the handle 6, positioning key 21 is snapped in get final product.The positioning key 21 that freewheel clutch 20 is installed in the intracavity of handle is strip shape bodies, and keyway 10 in its size and handle 6 inner chambers and the draw-in groove 17 on the freewheel clutch outer wall match and get final product.

With reference to Fig. 5,6,2,3, the lower dimension of knife bar 1 is bigger slightly than top, and its underpart is manufactured with the cutter head groove 25 that driver bit 8 is installed; Medium position has a blind hole, in the elastic force effect is installed the fixing pearl 7 of gear, be used for matching with three gear fixing holes 2 on the clutch sliding sleeve 3, realize transforming gear.The middle part of knife bar 1 and junction, top have a bar shaped positioning spline 26 vertically, be used for matching with the sliding sleeve positioning key 22 on the clutch sliding sleeve, realize clutch sliding sleeve 3 and knife bar 1 be connected and spacing, make clutch sliding sleeve 3 can only be on knife bar 1 axial slip, make on three gear fixing holes 2 and the knife bar 1 on the clutch sliding sleeve 3 gear fixedly pearl 7 cooperate on request, select gear, one ring-type draw-in groove 24 is arranged at the top of knife bar 1, when being used to knife bar 1 is installed and the location at intracavity of handle top 15 and being rotationally connected.Have three except aforesaid on the clutch sliding sleeve 3 with the gear fixing hole 2 on the straight line, sliding sleeve positioning key 22 is produced on the sliding sleeve upper inside wall, in addition, the external wall of upper portion of clutch sliding sleeve 3 is made into the external diameter boss 23 bigger than other position, when being installed in it in freewheel clutch, by sliding up and down of clutch sliding sleeve, finish respectively with two cooperations that turn to different clutch 20, or on move on in the topmost 13 of intracavity of handle 11, make knife bar 1 realize the rotation of hour hands just or inhour or neutral position.If when neutral position, grind clutch sliding sleeve 3 with hand rubbing, but the equal quick rotation of positive and negative clockwise.

With reference to Fig. 2,3,7, two freewheel clutches 20 suitable for reading 18 are harmonious is installed in the intracavity of handle 11 earlier, utilizes the plastic mattress 21 and handle 6 inwall tight fit card jails of clutch bottom.Again clutch sliding sleeve 3 is fastened in clutch sliding sleeve 3 on the knife bar 1 by 26 positions of the keyway on the knife bar 1, the knife bar 1 of band sliding sleeve 3 is passed the intracavity of handle 11 that freewheel clutch 20 has been installed, make the annular slot 24 of knife bar 1 upper end expose handle top 15, be stuck in snap ring 5 in the draw-in groove 24 on knife bar top, its position just is fixed, and formation is rotationally connected.One in cover blocks cap on snap ring 5 in case of necessity, in case snap ring in use comes off.But so just make the screwdriver of a gear shift.Can slide clutch sliding sleeve 3 on request during use, select left-handed or dextrorotation gear, restriction knife bar backwards rotation also can make it be in neutral gear, and left rotation and right rotation freely.Reach the instructions for use of various objectives.

Claims

But 1, a kind of screwdriver of gear shift, by handle (6), be installed in the knife bar (1) on the handle, the interior driver bit of cutter head groove (25) that is installed in knife bar (1) lower end constitutes, it is characterized in that in handle (6), being equipped with the mono-directional overrun clutch (20) of two switched in opposite, be set with clutch sliding sleeve (3) on the knife bar (1), be installed to again in the handle (6) of band clutch (20); Also be equipped with in the handle both sides and add the arm of force (4).
But 2, the screwdriver of a kind of gear shift according to claim 1 is characterized in that having three gear fixing holes (2) on clutch sliding sleeve (3), and fixedly hoodle (7) of a gear corresponding with gear fixing hole (2) is installed on knife bar (1).
But 3, the screwdriver of a kind of gear shift according to claim 1 and 2, the part that it is characterized in that being on the clutch sliding sleeve (3) in the clutch inner chamber is manufactured with the boss (23) that makes clutch (20) generation clutch action.
But 4, the screwdriver of a kind of gear shift according to claim 1 and 2 is characterized in that being on knife bar (1) and clutch sliding sleeve (3) with two clutch contacts site and is manufactured with corresponding bar shaped positioning spline (26) and positioning key (22).
But 5, the screwdriver of a kind of gear shift according to claim 1 and 2 is characterized in that knife bar (1) is rotatably installed in the hole (14) at intracavity of handle (11) top.