CN2858198Y

CN2858198Y - Electromotion tool

Info

Publication number: CN2858198Y
Application number: CN 200520074124
Authority: CN
Inventors: 马建英
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2005-07-27
Filing date: 2005-07-27
Publication date: 2007-01-17
Anticipated expiration: 2015-07-27

Abstract

The present utility model discloses an electromotion tool comprising a motor received inside the casing, an output shaft used for transferring the motor torque moment, a supporting plate used for supporting the output shaft, and a shaft locking mechanism. Said shaft locking mechanism comprises a shaft locking part connected movably to the output shaft and at least a return spring matching and connecting a shaft locking patch, wherein the shaft locking part is capable of locking or releasing said output shaft by shifting between a locking position and a releasing position, the return spring is a torsion spring. The present utility model is characterized in that it is operated comfortably and reliably and engrosses a small room, with a simple structure.

Description

Electric tool

Technical field

The utility model relates to a kind of electric tool, the particularly a kind of electric tool that need lock output shaft when changing workpiece.

Background technology

Thereby electric circular saw, bakelite such as mill at electric tool normally drives workpiece work by the rotation of motor-driven output shaft, but workpiece is easy to wearing and tearing and needs to change workpiece in long-term use, and in operating process, also often need to change the workpiece of various different sizes, but in the process of the instrument unloaded operation parts that use spanner or similar functions, output shaft is easy to take place transfer, thereby is unfavorable for the unloading of workpiece.Prior art has disclosed the various lock shaft devices that prevent the output shaft transfer.United States Patent (USP) 5,430, the 944 a kind of electric circular saws that disclosed, an affixed disk on motor output shaft with groove, casing is provided with piston and depression bar, thus the operation depression bar makes piston enter locking output shaft in the disk groove, unclamping the depression bar piston resets under the elastic force of stage clip and unclamps output shaft, but this lock shaft device parts are many, complex structure, and requisite space is big.United States Patent (USP) 5590988 has disclosed the lock shaft device that a kind of bakelite mills, the output shaft that this bakelite mills is provided with flat horizontal surface, the middle part is provided with greater than the circular hole of output shaft diameter and the flat hole of accommodating this flat horizontal surface that is attached thereto on its lock shaft spare, one end of lock shaft spare is provided with button, the other end is socketed with stage clip, one end of stage clip is resisted against on the inwall of supporting disk, output shaft can freely rotate when being positioned at greater than the circular hole of output shaft diameter, the button of pressing lock shaft spare makes that output shaft was locked when the flat horizontal surface of output shaft was positioned at flat hole, unclamp the button of lock shaft spare, this lock shaft spare resets under the elastic force of stage clip.This lock shaft device is simple in structure, but this lock shaft device uses stage clip as back-moving spring, will reach required elastic force generally speaking, and the diameter of stage clip is at least 7 or 8 millimeters, has then limited the axial size of the electric tool that uses this lock shaft device.In addition, stage clip generally is installed on the direction of motion of lock shaft spare, one end is resisted against on the supporting disk inwall, the other end is socketed on the lock shaft spare, and the elastic deformation amount of stage clip is depended in the movement travel of lock shaft spare, in order to obtain comfortable operational stroke, need the stage clip elastic deformation amount bigger, be that stage clip is longer, and stage clip is long more, the radial dimension of electric tool that this lock shaft device is installed is big more.In summary, day by day in the process of lightness, miniaturization development, this lock shaft device can not satisfy still that operation is comfortable, little requirement takes up room at present electric tool.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of electric tool, have simple in structure, operation is comfortable, little lock shaft device takes up room.

The technical solution of the utility model is: a kind of electric tool, comprise motor, the output shaft that transmits Motor torque that is loaded in the casing, supporting disk and the lock shaft device that supports described output shaft, described lock shaft device comprises the lock shaft spare that is connected movably on the described output shaft and at least one and the matched back-moving spring of described lock shaft sheet, described lock shaft spare moves to realize locking or to unclamp described output shaft that described back-moving spring can be that torsion spring also can be a spiral spring at locked position and released position.

The utility model compared with prior art, has following advantage:, have littler axial dimension and bigger strain, and the installation site of torsion spring and spiral spring is unrestricted because torsion spring and spiral spring are compared stage clip, simple with the relation of connecting of other structures, operation is reliable.Therefore use torsion spring or spiral spring to replace the back-moving spring of stage clip, improved the reliability and the comfortableness of lock shaft device operation, saved the space again as lock shaft device.And then the axial dimension and the radial dimension of the electric tool of also feasible this lock shaft device of use reduce greatly.

Description of drawings

The embodiment of the application on electric circular saw further specifies the utility model below in conjunction with accompanying drawing and the utility model.

Fig. 1 is the stereogram of electric circular saw among the utility model embodiment;

Fig. 2 uses the partial sectional view of torsion spring as the electric circular saw of lock shaft device back-moving spring among the utility model embodiment;

Fig. 3 uses the part exploded view of torsion spring as the electric circular saw of lock shaft device back-moving spring among the utility model embodiment;

Fig. 4 is that wherein lock shaft device is positioned at the released position along the partial sectional view of A-A line among Fig. 2;

Fig. 5 is the part sectioned view of the electric circular saw when lock shaft device is positioned at locked position as shown in Figure 4.

Fig. 6 uses the electric circular saw part exploded view of spiral spring as the lock shaft device back-moving spring among the utility model embodiment;

Fig. 7 uses the partial sectional view of spiral spring as the electric circular saw of lock shaft device back-moving spring among the utility model embodiment.

Wherein: 1. electric circular saw 2. casings 3. supporting disks 31. first gathering sills 32. second gathering sills 33. pillars 34. slots 35. concave surfaces 4. lock shaft devices 5. motors 6. workpieces 71. bearings 72. bearings 8. output shafts 81. flat quadrate part 9. lock shaft spares 91. buttons 92. first guide parts 93. convex shoulders 94. square holes 95. flat hole 96. circular holes, 97. second guide parts, 10. torsion springs, 11. fans 33 '. column 10 '. spiral spring 94 ' .L shape hole

The specific embodiment

Creating conception of the present utility model is lock shaft device, below is example with the electric circular saw only, specifies creation scheme of the present utility model.But the technical solution of the utility model is confined on electric circular saw one type electric tool incessantly, and it also may be used on the electric tool of other types, as bakelite mill, on angle mill or the Profile cut-off machine or the like.

Shown in seeing figures.1.and.2, use electric circular saw 1 of the present utility model to comprise casing 2, be loaded on the motor that has motor output shaft 85 in the casing 2, be connected lock shaft device 4 on the output shaft 8 movably, support the supporting disk 3 of output shaft 8 and the workpiece 6 matched with output shaft 8.Motor 5 is supported on respectively on casing 2 and the supporting disk 3 by the bearing 71,72 that is arranged on its output shaft 8 two ends and freely rotates, and starts building to do parts 6 work thereby drive output shaft 8 rotating bands.Because creation of the present utility model focuses on lock shaft device 4, other structures are all existing conventional construction, repeat no more herein.

With reference to shown in Figure 3, also be provided with fan 11 and flat quadrate part 81 (see figure 4)s on the output shaft 8.Lock shaft device 4 comprises lock shaft spare 9 and a pair of torsion spring 10 matched with lock shaft spare 9.The main body of lock shaft spare 9 is long body flat, the middle part is provided with a pair of square hole 94 matched with torsion spring 10, accommodate the circular hole 96 of output shaft 8 and the flat square hole 95 that is attached thereto, the one end also is provided with button 91, first guide part 92 and convex shoulder 93, and the other end is provided with second guide part 97.Supporting disk 3 outers are provided with and are used for respectively and first, second guide part 92,97 corresponding first, second gathering sills 31,32 that connect.Also be provided with a column 33 and slot 34 on the surface of internal cavity of supporting disk.

With reference to shown in Figure 4, after the lock shaft device assembling is finished, lock shaft spare 9 is socketed on the output shaft 8, first, second guide part 92,97 at its two ends correspondence respectively places first, second gathering sill 31,32, makes lock shaft spare 9 to do radial motion along the straight line of first, second gathering sill 31,32 definition.One column 33 and slot 34 are symmetricly set on the surface of internal cavity of the supporting disk 3 of lock shaft spare 9 both sides, the central part of a pair of torsion spring 10 is socketed in respectively on the column 33, a free end inserts in the slot 34 fixing, the square hole 94 that another free end is arranged on hook-shaped and the lock shaft spare 9 is matched, square hole 94 allows that the torsion spring hook-shaped end in the movement travel of locking and unclamping, has certain activity therein.

When needing lock shaft to change the operation of workpiece 6, press the button 91, lock shaft spare 9 radially moves down along first, second gathering sill 31,32, second guide part 97 stretches out casing downwards, thereby make the flat quadrate part 81 of output shaft 8 be arranged in flat square hole 95 locking output shafts 8 as shown in Figure 5, carrying out lock shaft when operation, suitably rotating output shaft 8 makes the easier and flat square hole 95 lock shaft spare 9 of flat quadrate part 81 connect.Replacing finishes, release button 91, lock shaft spare 9 is under the screen resilience of the torsion spring 10 of a pair of symmetric arrangement, upwards move in the footpath reposefully along first, second gathering sill 31,32, the width of convex shoulder 93 makes that greater than first gathering sill 31 lock shaft spare 9 moves on can not be excessively so that second guide part 97 breaks away from second gathering sill 32, thereby output shaft 8 was arranged in circular hole 96 greater than the output shaft diameter and can freely rotates and unclamped output shaft 8 this moment.For fear of the CONTACT WITH FRICTION that connect end and supporting disk 3 surface of internal cavity of torsion spring 10, can also be provided with area on the surface of internal cavity of supporting disk 3 and connect the concave surface 35 of end motion stroke greater than this with lock shaft spare 9.

With reference to Fig. 6 and shown in Figure 7, in the utility model second preferred embodiment, further use spiral spring 10 ' to substitute torsion spring 10 in the foregoing description as the back-moving spring of lock shaft device 4.The surface of internal cavity of the supporting disk 3 of lock shaft spare side is provided with column 33 '.The center fixation of spiral spring 10 ' is on column 33 ', and the L shaped hole 94 ' that external part is set on hook-shaped and the lock shaft spare 9 is matched.L shaped hole 94 ' allows that the spiral spring hook-shaped end in the movement travel of locking and unclamping, has certain activity therein.Because the different spiral springs that bring of spiral spring and this body structure of torsion spring and torsion spring are different with lock shaft spare docked mode, are that the easy full of beard of persons skilled in the art reaches.In addition, with spiral spring as the lock shaft device of back-moving spring with torsion spring seemingly as the assembling of the lock shaft device of back-moving spring and class of operation, no longer superfluous herein telling.

Referring to figs. 1 through shown in Figure 7, in the electric circular saw of present embodiment, fan 11 and about 7 millimeters of supporting disk 3 surface of internal cavity axial dimensions, need reach about 3 to 4 millimeters of the axial dimension of required elastic force torsion spring or spiral spring, the preceding case that is disclosed with background technology contrasts as can be known, uses torsion spring or spiral spring can reduce the axial installation dimension of electric tool.Further, in order to make lock shaft spare 9 operation comfortable, at about 18 to 20 millimeters, and torsion spring or spiral spring strain are big in the movement travel operated by rotary motion of locked position and released position for it, the installation site is arranged on the both sides of lock shaft spare 9, be not subjected to electric tool radially installation dimension limit.In summary, use torsion spring or spiral spring to replace the back-moving spring of stage clip, improved the reliability and the comfortableness of lock shaft device operation, saved the space as lock shaft device.And then the axial dimension and the radial dimension of the electric tool of also feasible this lock shaft device of use reduce greatly.

Claims

1. electric tool, comprise motor, the output shaft that transmits Motor torque that is loaded in the casing, supporting disk and the lock shaft device that supports described output shaft, described lock shaft device comprises the lock shaft spare that is connected movably on the described output shaft and at least one and the matched back-moving spring of described lock shaft spare, described lock shaft spare moves to realize locking or to unclamp described output shaft at locked position and released position, it is characterized in that described back-moving spring is a torsion spring.

2. electric tool according to claim 1, an end that it is characterized in that described torsion spring are arranged to hook-shaped matched with hole that be arranged on the described lock shaft spare, and the hole on the described lock shaft spare can make the hook-shaped end of described torsion spring move therein.

3. electric tool according to claim 1, it is characterized in that also being provided with on the described supporting disk column at fixing described torsion spring center and the slot of fixing described torsion spring one end, the side that described column and described slot are arranged on described lock shaft spare makes described torsion spring at described lock shaft spare side.

4. electric tool according to claim 1 is characterized in that described torsion spring is two, is separately positioned on the both sides of described lock shaft spare.

5. electric tool according to claim 4 is characterized in that described two torsion springs are the both sides that are arranged on described lock shaft spare symmetrically.

6. electric tool according to claim 1 is characterized in that described output shaft also is provided with the mating part, also is provided with matching hole on the described lock shaft spare, and described lock shaft spare is implemented in moving between locked position or released position by moving radially.

7. electric tool according to claim 1 is characterized in that described output shaft can be a motor output shaft, also can be the output shaft of the transmission device that connects with motor output shaft.

8. electric tool, comprise motor, the output shaft that transmits Motor torque that is loaded in the casing, supporting disk and the lock shaft device that supports described output shaft, described lock shaft device comprises the lock shaft spare that is connected movably on the described output shaft and at least one and the matched back-moving spring of described lock shaft spare, described lock shaft spare moves to realize locking or to unclamp described output shaft at locked position and released position, it is characterized in that described back-moving spring is a spiral spring.

9. electric tool according to claim 8 is characterized in that also being provided with the fixedly column at spiral spring center on the described supporting disk, and described column is positioned at the side of described lock shaft spare.