CN2096452U

CN2096452U - Hand screwdriver

Info

Publication number: CN2096452U
Application number: CN 91212120
Authority: CN
Inventors: 李特元
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-01-19
Filing date: 1991-01-19
Publication date: 1992-02-19

Abstract

A hand screwdriver belongs to a novel hand tool for disassembling and assembly a screw. The hand screwdriver comprises a pistol-shaped shell, a pulling lever, a gear driving device, a speed-governing button, a reversing knob, a magnetic clamping device and a screw cutter. With the lever and a gear-shifting device, the high speed or high torque and the positive or negative rotation are realized. The utility model has the advantages of flexible operation, compactness, time saving, labour saving, high efficiency and good appearance.

Description

Hand screwdriver

This device is a kind of hand-operated tools that is mainly used in the dismounting screw.

At present, the main tool of dismounting screw have hand and DYN dynamic screwdriver, current our country use very widely screwdriver be common spiral shell cutter, be commonly called as bottle opener.Its formation generally constitutes with the corresponding head of afterbody flute profile of screw and wooden handle by one.During the dismounting screw, rely on wrist to rotate precession or back-out screw, this instrument efficient is not high.Because, the first, the angle of the wrist rotation of staff is very limited, between about 45 °～120 °, the second, angle of every rotation must be transferred to the spiral shell cutter, the angle that swaps round, alignment screw flute profile insertion again, Rotation realizes slack adjuster and so forth; The 3rd, in rotary screw, must hang on to handle, just may handle be slided in hand, the time of exerting oneself is long, so efficient is low, labour intensity is big.When " the self-action screwdriver " produced in Long March farm, Shanghai operated, its became wrist and rotates to be reciprocal promotion campaign, and this mechanism reduces labor intensity to a certain extent, improved labor productivity, still, it has following shortcoming: one, mechanism's length is excessive, reaches 500mm; The second, need bimanualness, the 3rd, rotation torque is little.Current novel electronic spiral shell cutter.Because power consumption, can not be away from power supply, noise is big, vibrate greatlyyer, and replacing spiral shell cutter speed is slow, and price is also higher, so its use is subjected to certain limitation.

For the foregoing reasons, the purpose of this utility model is promptly providing a kind of efficient height, and labour intensity is low, and flexible and convenient operation, compact conformation, moderate need not the instrument of the dismounting screw of power supply.

The utility model is to realize like this, a device of forming by casing, shifting lever, gear train assembly, speed governing button, commutation knob, the speed governing button, the commutation knob can be in different axial diverse locations by control gear, realizing the engagement of different gear mesh, thereby realize different rotating speeds, different moments of torsion, and the output of different direction of rotation, they are fixed on is convenient to the position of operating on the casing.

Gear train assembly is by a triple gear, and four-gear block and gear shaft constitute.Wherein the structure of triple gear is such, and arranging along its axis direction is respectively that pinion, gear wheel and serrated end face helical gear constitute; The structure of four-gear block is that to arrange along its axis direction be respectively gear wheel, angular wheel, a bit of cylinder axis, pinion, bevel gear, and wherein the gear wheel root diameter is greater than the big end tooth outside diameter circle of angular wheel.The root diameter of pinion is greater than the diameter of coupled a bit of cylinder axis, the pinion gear teeth tip circle is less than angular wheel small end root diameter, the modulus gear reference cone angle of two angular wheels is in full accord, and the angular wheel small end is relative, be gear shaft between two bevel gears, one end of gear shaft is a bevel gear, can with two bevel gears in the four-gear block in any to carry out shaft angle be 90 ° engagement.The other end has the inner chamber of an on-circular cross-section.The outside is the annular magnetic ferroic material, and it cooperates with spiral shell cutter one splaying with similar on-circular cross-section, relies on the magnetic force clamping to prevent to become flexible, come off.

The gear wheel in the triple gear and the pinion of four-gear block are a pair of meshed gears each other; The gear wheel of pinion and four-gear block is a pair of meshing gear each other in the triple gear, and the reference center distance of these two pairs of gears is identical.

Stir lever and have spring reverse motion, its side has a serrated end face helical gear.Its profile of tooth is just opposite with triple gear serrated end face helical teeth profile of tooth, and they can mesh together, and can make when stirring lever and pulling, and can drive the triple gear rotation, and when it resets, can not drive triple gear.Triple gear is contained in one with matched in clearance to go up its both sides be respectively spring and speed governing button with stirring lever, and the speed governing button is actually the cover of a band shoulder.Its shoulder part is in casing, and the other end stretches out outside the casing, and it can move axially, because the spring action of opposite side makes that down stirring lever is adjacent to triple gear, triple gear is adjacent to the shoulder end face of speed governing button.The speed governing button is adjacent to the inwall of casing with its circular bead surface.When not pressing the speed governing button, the pinion of triple gear remains the gear wheel engagement with four-gear block, and when pressing the button, the gear wheel of triple gear remains the pinion with four-gear block.Therefore can realize the output of friction speed.

Four-gear block and its axle joins together, and an end is contained on the casing, and the other end is contained on the commutation knob, fixes by stop screw, makes four-gear block when not mobile, can only rotate on the commutation knob, can not move axially.The commutation knob is exactly the bolt of a band endoporus, is fixed on the casing with thread forms.Knob is in the outside of casing, and the turn knob just can make four-gear block move axially, owing to have the gear shaft of angular wheel in the middle of the angular wheel of four-gear block, so as long as rotation commutation knob necessarily revolves number.Just can make the bevel gear engagement of any and gear shaft in two angular wheels in the four-gear block, thereby realize the output of different rotary direction.

For the ease of operation, the shell of this device adopts the pistol form.

More than device has following characteristics:

As everyone knows, assemble a screw, it is very little beginning required moment of torsion, has only last one or two circle, and needed moment of torsion is just bigger, when screwing out screw, need to begin torque ratio bigger, and just relatively more loose afterwards, the moment of torsion that needs is less.This device is provided with arrangements for speed regulation at this particular problem, and low or first gear can produce high moment of torsion.Top gear produces high-speed, and when people used this instrument like this, running into needed high pulling torque just to adopt low or first gear, can obtain very high pulling torque like this, just more laborsaving; Run into when not needing high pulling torque, adopt top gear, can save time like this, therefore, both can very light screw be screwed or unscrew.Can carry out very soon again, clearly improve operating efficiency, alleviate labour intensity.This device adopts pistol form shell gear drive simultaneously.Operation is that one hand carries out, thus this mechanism structure compactness, good looking appearance, easy to operate.Simultaneously, adopted magnetic force as chucking power, it is quite fast to change spiral shell cutter speed, need not pull any device, only needs former spiral shell cutter is extracted out, injects needed spiral shell cutter just passable.Therefore, this device has unique advantage.

The present invention has following accompanying drawing:

Fig. 1, the subjectivity figure of this device

Fig. 2, the A-A cutaway view of Fig. 1

Fig. 3, the B portion enlarged drawing of Fig. 2

Wherein: the 1st, casing, the 2nd, stir lever, the 3rd, triple gear, the 4th, four-gear block.The 5th, speed governing button, the 6th, commutation knob, the 7th, gear shaft, the 8th, annular magnet, the 9th, spiral shell cutter.10, the 13rd, banking pin, the 11,12, the 14th, spring.

Accompanying drawing 1 accompanying drawing 2 and accompanying drawing 3 clearly reflected this device structure, stir lever and triple gear and be assemblied on the axle 14 with gap fiting mode, when pulling when stirring lever, the side of stirring lever is serrated end face helical gear C, serrated end face helical gear C ' engagement with triple gear, the rotation of drive triple gear, when not pressing speed governing button 5, be under the situation shown in Figure 2 triple gear 3 with pinion a and four-gear block gear wheel a ' engagement, the rotation of drive four-gear block, at this moment can only obtain less rotating speed, but can obtain than high pulling torque; Triple gear is under the promotion of button when pressing speed governing button 5, with the pinion b ' engagement of the gear wheel b and the four-gear block of triple gear, at this moment can obtain at a high speed, but it is little to produce moment of torsion.

The commutation knob is by banking pin restriction four-gear block axial location, and limit method as shown in Figure 3.The Screw 13 of commutation knob is when being threaded into, and it can stretch in the circular trough on the axle, makes this axle to commutate knob relatively and can not move axially, and the commutation knob is inwards during precession, when its circular bead surface S arrives at the casing surface, and its taper cone pulley d ₁With gear shaft 7 correct engagement, when the commutation knob screws out to the outside.Banking pin arrives at the inner surface (being state shown in Figure 2) of casing, angular wheel d ₂Just and gear shaft 7 correct engagement, gear shaft 7 is fixed on the shown position by banking pin 10.The other end of gear shaft has hexagonal cavity in, and an annular magnet is being overlapped in the outside.

The gearratio of running part is respectively in this example:

The pinion a of triple gear and four-gear block a ' engagement, gearratio is 1:3,

The gearratio of the gear wheel b of triple gear and four-gear block b ' engagement is 5:1

The conical tooth d of four-gear block ₁, d ₂The gearratio that meshes with gear shaft 7 all is 5:1

This routine process is such, and casing is two open types, and is injection molded by engineering plastics.Stir lever, triple gear, four-gear block and all adopt cast steel model casting, machined formed after gear shaft adopted first cast blank.

This device method of operating is the handgrip of casing and stirs lever and place between thumb and the palm.Hold and stir lever spiral shell cutter and get final product turn, carry out speed governing,, can realize rapid movement, do not press the speed governing knob, can produce high moment of torsion as press the speed governing button with thumb according to the firmly situation of hand.When needing the transposing direction of rotation, putting in place to knob with the left hand transposing gets final product.

Claims

1, a kind of manual screw cutter.It by casing [1], stir lever [2], gear train assembly [3,4,7], speed governing button [5], commutation knob [6] constitutes, it is characterized in that: speed governing button [5], commutation knob [6] are that the element of the diverse location of control gear is fixed on the casing.

2, according to the described device of claim 1, wherein casing (1) is the pistol form.

3,, it is characterized in that gear train assembly is made up of triple gear (3), four-gear block (4), gear shaft (7) according in the described device of claim 1.

4, according in the described device of claim 3, it is characterized in that the triple gear structure is such, arranging along its axis direction is respectively pinion, gear wheel, serrated end face helical gear.

5,, it is characterized in that the four-gear block structure is to be respectively along its axis direction: gear wheel, bevel gear, a bit of cylinder axis, pinion, bevel gear according to claim 3.

6, according in right 4, the 5 described devices, the gear wheel of the pinion of triple gear (3), four-gear block (4) is a pair of meshing gear each other, and the pinion of the gear wheel of triple gear (3) and four-gear block (4) is a pair of meshed gears each other.And these two pairs of meshing gear centre-to-centre spacing are identical.

7, be positioned in the middle of two bevel gears of four-gear block (4) according to the described device gear shaft of right (3) (1), the other end of gear shaft has the inner chamber of on-circular cross-section, overcoat one ring magnetic material.