CN202147246U

CN202147246U - Force-limiting screwdriver

Info

Publication number: CN202147246U
Application number: CN201120220209U
Authority: CN
Inventors: 劳应海
Original assignee: Dongguan Lomak Plastic & Electronics Products Co Ltd
Current assignee: DONGGUAN LOMAK OPTO-MECHATRONICS TECHNOLOGY COMPANY LIMITED
Priority date: 2011-06-27
Filing date: 2011-06-27
Publication date: 2012-02-22
Anticipated expiration: 2021-06-27

Abstract

The utility model discloses a force-limiting screwdriver, which belongs to hardware tools and comprises a force-limiting screwdriver body, a hollow large-body aluminum barrel, a gear set and a screwdriver bit. The gear set is detachably fixed in the large-body aluminum barrel, a gasket, a spring and a screw cap are successively mounted in the large-body aluminum barrel from bottom to top, the elasticity of the spring is adjusted by the screw cap, the gear set is located between the spring and the gasket and comprises a upper metal gear plate, a lower metal gear plate, a upper plastic gear plate fixing seat and a lower plastic gear plate fixing seat, the upper metal gear plate and the lower metal gear plate are meshed mutually, and the upper plastic gear plate fixing seat and the lower plastic gear plate fixing seat respectively fix the upper gear plate and the lower gear plate. The force-limiting screwdriver is simple in structure, the torsion of the screwdriver can be changed by means of adjusting the screw cap to compress the spring, and damage of equipment due to overexertion is effectively prevented. In addition, the gear set consists of the plastic gear plate mounting seats and the metal gear plates which are used with each other, on the one hand, toughness and hardness of the gear set are guaranteed, and on the other hand, the cost of the gear set is saved.

Description

A kind of limit power screwdriver

Technical field

The utility model belongs to the hardware & tools technical field, is specifically related to a kind of limit power screwdriver.

Background technology

Screwdriver is the hardware & tools that often can use in people's daily life; Existing screwdriver generally comprises handle, gear train and screw screwdriver bit; Said gear train comprises intermeshing cogging and lower gear, and said gear train is metal-toothed wheels or teeth plastic wheels.Much need at present to use the equipment of screwdriver dismounting all to compare exquisiteness, the bad control of dynamics of knob when using screwdriver, overexerting causes the damage of equipment easily; In addition, teeth plastic wheels toughness is weak, low, the easy deformation of hardness, though and metal-toothed wheels toughness is strong, hardness is high, distortion is little, the metal gear price is more expensive, cost is higher.

The utility model content

In order to address the above problem, the utility model provides a kind of simple in structure, with low cost, the limit power screwdriver that can set torsion as required.

A kind of limit power screwdriver, comprise hollow the bodice Aluminum Drum, be removably fixed in gear train and screw screwdriver bit in the bodice Aluminum Drum; The pad of axial chucking screw screwdriver bit, the spring of set screw cutter torsion also are installed in the said bodice Aluminum Drum from the bottom to top successively, and the screw cap of fixing spring and regulating spring elastic force; Said gear train is between spring and pad; That said gear train comprises is intermeshing, the cog sheet and the lower gear sheet of metal, and cog sheet holder and lower gear sheet holder fixedly cog respectively sheet and lower gear sheet, plastic cement.

Wherein, said pad is riveted in the bodice Aluminum Drum.

Wherein, said screw cap center is provided with the adjustment hole of set screw lid axially-movable, and said screw cap is installed in the bodice Aluminum Drum through screw thread.

Wherein, be provided with first faced washer that to reduce friction between said screw cap and the spring.

Wherein, be provided with second faced washer that to reduce friction between said gear train and the pad.

Wherein, said bodice Aluminum Drum is provided with plastic shell outward.

Wherein, said screw screwdriver bit is provided with projection, and said projection is positioned at the junction of screw screwdriver bit and gear train.

The beneficial effect of the utility model is: a kind of limit power screwdriver, comprise hollow the bodice Aluminum Drum, be removably fixed in gear train and screw screwdriver bit in the bodice Aluminum Drum; The pad of axial chucking screw screwdriver bit, the spring of set screw cutter torsion also are installed in the said bodice Aluminum Drum from the bottom to top successively, and the screw cap of fixing spring and regulating spring elastic force; Said gear train is between spring and pad; That said gear train comprises is intermeshing, the cog sheet and the lower gear sheet of metal, and cog sheet holder and lower gear sheet holder fixedly cog respectively sheet and lower gear sheet, plastic cement.

The limit power screwdriver structure of the utility model is simple, and the torque magnitude of screwdriver can change through set screw lid compression spring, has prevented the device damage that causes because of overexerting effectively; In addition, gear train adopts plastic cement gear sheet mount pad and metal gear sheet to be used, and has guaranteed the toughness and the hardness of gear train on the one hand, has saved the cost of gear train on the other hand.

Description of drawings

Fig. 1 is the structural representation of the limit power screwdriver of the utility model.

Fig. 2 is the decomposition texture sketch map of Fig. 1.

Fig. 3 is the axial cutaway view of Fig. 1.

Description of reference numerals is following:

10-screw cap; 20-spring;

31-the sheet holder cogs; 32-sheet cogs;

33-lower gear sheet; 34-lower gear sheet holder;

40-pad; 51-screw screwdriver bit;

60-bodice Aluminum Drum; 71-the first faced washer;

72-the second faced washer; 101-adjustment hole;

511-projection.

The specific embodiment

For the purpose, technical scheme and the advantage that make utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.

Referring to Fig. 1 to Fig. 3, a kind of limit power screwdriver, comprise hollow bodice Aluminum Drum 60, be removably fixed in gear train and screw screwdriver bit 51 in the bodice Aluminum Drum 60; The pad 40 of axial chucking screw screwdriver bit 51, the spring 20 of set screw cutter torsion also are installed in the said bodice Aluminum Drum 60 from the bottom to top successively, and the screw cap 10 of fixing spring 20 and regulating spring 20 elastic force; Said gear train is between spring 20 and pad 40; That said gear train comprises is intermeshing, the cog sheet 32 and the lower gear sheet 33 of metal, and fixedly cog respectively sheet 32 and cog sheet holder 31 and lower gear sheet holder 34 lower gear sheet 33, plastic cement.

Set screw lid 10; Gear train is engagement under the effect of spring 20 pressure, in the twisting process, twisting force makes its rotation on bodice Aluminum Drum 60; Bodice Aluminum Drum 60 drives the sheet 32 that cogs and rotates; The sheet 32 that cogs drives lower gear sheet 33 again, and torsion is passed to screw screwdriver bit 51 by lower gear sheet 33, acts at last on the screw to be twisted.The size of torsion is controlled through the adjusting of screw cap 10, and when set screw covered 10, spring 20 received the pressure change of screw cap 10, and spring 20 pressure that gear train receives also change thereupon, and simultaneously, the size of screwdriver torsion is changed.In the twisting process, when torsion when setting torsion, gear train compression spring 20, upper and lower gear sheet breaks away from engagement, twisting finishes.

The gear train of the limit power screwdriver of the utility model adopts the gear sheet of metal and the gear sheet holder of plastic cement to replace metal-toothed wheels of the prior art or teeth plastic wheels; Reduced the cost of metal-toothed wheels on the one hand; Improve shortcomings such as teeth plastic wheels toughness is weak, hardness is low, yielding on the other hand, satisfied the popular demand of people.

Wherein, said pad 40 is riveted in the bodice Aluminum Drum 60.

Wherein, said screw cap 10 centers are provided with the adjustment hole 101 that set screw is covered 10 axially-movables, and said screw cap 10 is installed in the bodice Aluminum Drum 60 through screw thread.

Wherein, be provided with first faced washer 71 that to reduce friction between said screw cap 10 and the spring 20.Be provided with second faced washer 72 that to reduce friction between said gear train and the pad 40.The effect of first faced washer 71 and second faced washer 72 all is to reduce the friction between the part, effectively prevents damage parts, prolongs part service life.

Wherein, the said bodice Aluminum Drum 60 outer plastic shells that are provided with.Plastic shell protects bodice Aluminum Drum 60 to be corroded on the one hand, can increase the frictional force between bodice Aluminum Drum 60 and the hand in use on the other hand, prevents to skid.

Wherein, said screw screwdriver bit 51 is provided with projection 511, and said projection 511 is positioned at the junction of screw screwdriver bit 51 and gear train.Increase the tightness degree that screw screwdriver bit 51 is connected with gear train through projection 511, prevent that effectively screw screwdriver bit 51 breaks away from bodice Aluminum Drum 60.

The limit power screwdriver structure of the utility model is simple, and the torque magnitude of screwdriver can be covered 10 compression springs 20 through set screw and change, and has prevented the device damage that causes because of overexerting effectively; In addition, gear train adopts plastic cement gear sheet mount pad and metal gear sheet to be used, and has guaranteed the toughness and the hardness of gear train on the one hand, has saved the cost of gear train on the other hand.

Above content is merely the preferred embodiment of the utility model; For those of ordinary skill in the art; According to the thought of the utility model, the part that on the specific embodiment and range of application, all can change, this description should not be construed as the restriction to the utility model.

Claims

1. limit power screwdriver, comprise hollow the bodice Aluminum Drum, be removably fixed in gear train and screw screwdriver bit in the bodice Aluminum Drum; It is characterized in that: the pad of axial chucking screw screwdriver bit, the spring of set screw cutter torsion also are installed in the said bodice Aluminum Drum from the bottom to top successively, and the screw cap of fixing spring and regulating spring elastic force; Said gear train is between spring and pad; That said gear train comprises is intermeshing, the cog sheet and the lower gear sheet of metal, and cog sheet holder and lower gear sheet holder fixedly cog respectively sheet and lower gear sheet, plastic cement.

2. a kind of limit power screwdriver according to claim 1, it is characterized in that: said pad is riveted in the bodice Aluminum Drum.

3. a kind of limit power screwdriver according to claim 2 is characterized in that: said screw cap center is provided with the adjustment hole of set screw lid axially-movable, and said screw cap is installed in the bodice Aluminum Drum through screw thread.

4. a kind of limit power screwdriver according to claim 3 is characterized in that: be provided with first faced washer that can reduce friction between said screw cap and the spring.

5. a kind of limit power screwdriver according to claim 4 is characterized in that: be provided with second faced washer that can reduce friction between said gear train and the pad.

6. a kind of limit power screwdriver according to claim 5, it is characterized in that: said bodice Aluminum Drum is provided with plastic shell outward.

7. according to each described a kind of limit power screwdriver of claim 1 to 6, it is characterized in that: said screw screwdriver bit is provided with projection, and said projection is positioned at the junction of screw screwdriver bit and gear train.