CN105033958B

CN105033958B - Power tool and the operational approach of replacing this power tool work head

Info

Publication number: CN105033958B
Application number: CN201510585534.XA
Authority: CN
Inventors: 钟红风; 庞晓丽; 谢明健
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2012-08-16
Filing date: 2012-08-16
Publication date: 2016-11-30
Anticipated expiration: 2032-08-16
Also published as: CN103586846A; CN103586846B; CN105033958A

Abstract

A kind of power tool, including casing；The motor being arranged in casing；Output shaft, has the axially arranged accepting hole accommodating work head；Drive mechanism, is arranged between motor and output shaft and the rotary power that motor exports can be passed to output shaft；Storage folder, described storage folder includes the collecting storehouse for housing several work heads being set up in parallel；Drive mechanism includes the connecting shaft that the rotary motion of motor passes to output shaft, and connecting shaft can connect through housing storehouse with one of several work heads or separate with one of several work heads described；Power tool also includes the bearing housing described storage folder, described bearing can move relative to casing between primary importance and the second position, during primary importance, position that can be corresponding with output shaft accepting hole by being operationally adjusted to one of several work heads is pressed from both sides in described storage, when being positioned at the second position, described work head is in the state that can be operationally gripped out from storage.

Description

Power tool and operation method for replacing working head of power tool

The invention is a divisional application of the Chinese patent application with the application number of 201210292099.8, named as 'power tool and operation method for replacing working head of the power tool', applied by the applicant at 8, 16/2012.

Technical Field

The invention relates to a power tool and an operation method for replacing a working head of the power tool, in particular to an electric drill, an electric screwdriver and other power tools capable of realizing quick replacement of the working head and an operation method for replacing the working head of the power tool.

Background

A power drill is a power tool for drilling a hole in a workpiece, and a power screwdriver is a power tool for tightening a screw to a workpiece. When holes with different diameters need to be drilled or screws with different specifications need to be screwed down in the using process, drill bits or screwdriver bits with different specifications need to be replaced, namely the working heads need to be taken down and then the working heads with the other specifications need to be installed. In the use occasion that the working head needs to be replaced frequently, great inconvenience is brought to an operator, on one hand, the working head is troublesome to replace, and on the other hand, the taken-off working head is easy to lose everywhere. Therefore, it is conceivable to store a plurality of working heads in the storage clamp, then to place the storage clamp in the power tool, to push out the working heads by the operating mechanism for working, to pull back the working heads into the storage clamp by the operating mechanism when the working heads need to be replaced, and to adjust the position of the storage clamp to select the desired working head.

The number of the working heads stored in the storage clamp is limited, that is, it is impossible to store all the working heads of all specifications in the same storage clamp at one time, so when the working heads of other specifications are required to be used, the storage clamp which is new and stores the working heads of the required specification needs to be replaced, or the working heads in the original storage clamp are replaced by the working heads of the required specification. Such operations are still relatively cumbersome and need to be improved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a power tool which is simple to operate and high in working efficiency.

In order to solve the above problem, the present invention provides a power tool including: a housing; a motor disposed in the housing and outputting rotational power; the output shaft is provided with an accommodating hole which is axially arranged and used for accommodating the working head; the transmission mechanism is arranged between the motor and the output shaft and can transmit the rotary power output by the motor to the output shaft; the storage clamp is arranged at one end close to an output shaft of the motor, the storage clamp comprises a containing bin for containing a plurality of working heads arranged in parallel, and the storage clamp is provided with a storage clamp central line extending axially; the connecting shaft can axially move between a working position which penetrates through the accommodating bin and is matched and connected with one of the working heads and a release position which is separated from the one of the working heads; the power tool comprises a support for accommodating the storage clamp, the support can move between a first position and a second position relative to the machine shell, when the support is located at the first position, the storage clamp can be operatively adjusted to a position where one of the working heads corresponds to the accommodating hole of the output shaft, and when the support is located at the second position, the working heads can be operatively taken out of the storage clamp.

Preferably, when the support is located at the second position, the working head is separated from the storage clip along the direction of the central line of the output shaft. Alternatively, the storage clip may be operatively disengaged from the abutment in the direction of the centre line of the output shaft when the abutment is in the second position.

Preferably, when the support is located at the second position, the center line of the storage clip is arranged at an angle with the connecting shaft. Alternatively, when the support is located at the second position, the centerline of the storage clip is radially offset from the connecting shaft, and at least one of the bins is exposed outside the housing.

Preferably, the support is pivotally arranged relative to the housing. The pivot axis of the support is parallel to the central line of the output shaft. In another alternative embodiment, the pivot axis of the mount is disposed at an angle to the centerline of the output shaft.

Preferably, the output shaft is fixedly arranged relative to the support. The storage clip is rotatable relative to the support base about a storage clip centerline.

Preferably, the support is provided with a window through which the storage clip is operatively driven to rotate to a position in which one of the plurality of working heads is aligned with the output shaft receiving aperture when the support is in the first position.

Preferably, the casing is provided with an operating mechanism which is movable between an initial position and a working position relative to the casing. The operating mechanism comprises a sliding cover, and the sliding cover can slide along the axial direction relative to the machine shell.

Preferably, a locking mechanism is arranged between the support and the casing, when the operating mechanism is located at the initial position, the locking mechanism acts on the support and limits the movement of the support, and when the operating mechanism is located at the working position, the locking mechanism releases the limit on the support. The locking mechanism comprises a stop block arranged on the sliding cover and a stop head arranged on the support, when the operating mechanism is located at an initial position, the stop block is matched and connected with the stop head to prevent the support from moving, and when the operating mechanism is located at a working position, the stop block is separated from the stop head to allow the support to move.

In another alternative embodiment, the locking mechanism includes a recess in the support, a detent pin in the housing, a spring biasing the detent pin, and a post movable with the slide, the detent pin engaging the recess at an end thereof, the support being locked in position relative to the housing when the post abuts the detent pin, the support being disengaged from the detent pin against the spring when the post is disengaged from the detent pin, allowing the support to move relative to the housing.

Preferably, a holding mechanism is arranged between the casing and the support, and the holding mechanism can hold the support at the first position or the second position. The holding mechanism comprises a pin abutted to the support and an elastic piece arranged between the pin and the shell.

A power tool comprising a housing; a motor disposed in the housing and outputting rotational power; the output shaft is provided with an accommodating hole which is axially arranged and used for accommodating the working head; the transmission mechanism is arranged between the motor and the output shaft and can transmit the rotary power output by the motor to the output shaft; the storage clamp is arranged at one end of the output shaft close to the motor, the storage clamp comprises a containing bin for containing a plurality of working heads arranged in parallel, and the storage clamp is provided with a storage clamp central line extending axially and can rotate around the storage clamp central line; the connecting shaft can axially move between a working position which penetrates through the accommodating bin and is matched and connected with one of the working heads and a release position which is separated from the one of the working heads; the storage clamp can pivot between a first position and a second position around a first axis, when the storage clamp is located at the first position, the storage clamp can be operatively adjusted to a position where one of the working heads corresponds to the output shaft accommodating hole, and when the storage clamp is located at the second position, the working heads can be operatively taken out of the storage clamp.

Preferably, when the storage clip is in the second position, the at least one bin is exposed outside the housing.

Preferably, the power tool further comprises a mount supporting the storage clip, the mount being pivotally arranged relative to the housing, the first axis being a pivot axis of the mount.

An operation method for replacing a working head of a power tool comprises the following steps: 1) axially moving the connecting shaft to a release position separated from one of the plurality of working heads; 2) moving the support from the first position to the second position; 3) and separating the working head from the support or separating the storage clamp from the support.

Preferably, the manner in which the support moves from the first position to the second position is pivoting. Preferably, the output shaft has a center line, and the working head is separated from the support or the storage clip is separated from the support along the direction of the center line of the output shaft.

The invention has the beneficial effects that: the technical scheme of the invention provides a user with different experience of changing the working head; due to the adoption of the support which is movably arranged relative to the shell, the working head can be conveniently and quickly taken out of the storage clamp when the storage clamp supported in the support moves from the first position to the second position, so that the operation of replacing the working head is simple, convenient and quick.

Drawings

The present invention is described in further detail below with reference to the attached drawings.

Fig. 1 is a schematic front view of a power tool according to a first embodiment of the present invention.

Fig. 2 is a front sectional view of the power tool of fig. 1.

Fig. 3 is a sectional view of the power tool in the front view direction of fig. 1, at this time, the sliding cover drives the working head to move out of the shaft through the connecting shaft for outputting.

Fig. 4 is a schematic view of the power tool in fig. 1 in a front view direction after the sliding cover is pulled by the power tool.

Fig. 5 is a schematic cross-sectional view taken along line E-E of fig. 4.

Fig. 6 is a partial enlarged sectional view of fig. 4 with a portion of the housing and the working head removed by the mark I.

Fig. 7 is a partially enlarged schematic view of the mating structure when the sliding cover is closed in fig. 1.

FIG. 8 is a schematic view of the holder of FIG. 4 in a pivoted position with the storage clip removed from the holder.

Fig. 9 is a schematic front view of a power tool according to a second embodiment of the present invention.

Fig. 10 is a schematic cross-sectional view taken along line F-F in fig. 9.

FIG. 11 is a front view of the power tool of FIG. 9, with the slide cover in an open position and the holder in a pivoted position.

Fig. 12 is a schematic sectional view taken along line G-G in fig. 11.

FIG. 13 is a cross-sectional view taken along line H-H of FIG. 12 with the holder in a locked position.

FIG. 14 is a cross-sectional view taken along line H-H of FIG. 12 with the holder in a released position.

FIG. 15 is a cross-sectional view taken along line H-H of FIG. 12 with the stand in a pivoted position.

Wherein,

1, case 2, motor 3, transmission mechanism

4. Output shaft 6, battery 7, button switch

9. Working head 11, handle part 13 and front shell

14. Stop 15, front shell 16, stop block

17. Retaining means 18, pin 19, resilient member

21. Motor shaft 22, gear box 28, 28' window

30. Pinion gear mechanism 31, planetary gear reduction mechanism 40, sleeve

41. Containing hole 42, pin 50 and fixing block

51. Connecting shaft 52, storage clips 53, 53' sliding cover

54. Recess 55, seat 55a, pivot

56. V-groove 60, locating pin 60a, locating pin end

62. Spring 64, top column 130, opening

221. Partition 223, gearbox cover plate 301, first gear

302. Second gear 303, third gear 521, working head accommodating bin

Detailed Description

In the preferred embodiment of the power tool of the present invention, the power tool is a power screwdriver, which can be classified into a pneumatic screwdriver, a hydraulic screwdriver and an electric screwdriver according to the power source, and the electric screwdriver also has a dc component and an ac component.

Referring to fig. 1 to 3, the dc electric screwdriver includes a housing 1, a motor 2, a battery 6, a transmission mechanism 3, a connecting shaft 51, a working head support mechanism, and an output shaft 4. The casing 1 is assembled by folding two half shells which are symmetrical left and right by screws (not shown), and is provided with a horizontal part and a handle part 11 which forms an obtuse angle with the horizontal part, and the preferred angle K between the handle part 11 and the horizontal part is between 100 degrees and 130 degrees, so that the handle part 11 can be held comfortably during operation. The upper part of the handle part 11 is provided with a button switch 7, the battery 6 is fixed at the rear part of the handle part 11, and the transmission mechanism 3 is partially and fixedly accommodated in the horizontal part of the machine shell 1. As a preferred embodiment, the battery 6 may be a lithium ion battery. It should be noted that the lithium ion battery referred to herein is a generic term of a rechargeable battery in which a negative electrode material is a lithium element, and may be constructed in many systems, such as a "lithium manganese" battery, a "lithium iron" battery, and the like, depending on a positive electrode material. In the present embodiment, the lithium ion battery is a lithium ion battery having a rated voltage of 3.6V (volts). Of course, the battery 6 may also be of a nickel cadmium, nickel hydrogen, or the like, of a type well known to those skilled in the art.

The transmission mechanism 3 includes, from back to front (rear on the right side of the drawing), a planetary gear reduction mechanism 31 driven by the motor 2 and a pinion mechanism 30, wherein the pinion mechanism 30 is connected to a connecting shaft 51, and transmits the rotational motion of the motor 2 to the output shaft 4 through the connecting shaft 51. The working head supporting mechanism is used for storing different working heads, the working heads mainly refer to cross screwdriver heads, straight screwdriver heads, drill heads and the like commonly used by the electric screwdriver, and different working heads can be quickly replaced when the electric screwdriver screws or loosens different screws by operating the connecting shaft to axially move through the working head supporting mechanism or leave the working head supporting mechanism. According to the above composition of the electric screwdriver, the electric screwdriver can be divided into a motor part D provided with a motor, a transmission part C provided with the transmission mechanism 3, a storage part B provided with the working head support mechanism and an output part a provided with an output shaft in sequence from back to front (with the right side of the drawing as the back).

The motor 2 in the preferred embodiment of the invention is an electric motor having a motor shaft 21 extending forwardly from the motor housing. The motor is fixed in the machine shell 1, the gear box 22 is fixed in the machine shell 1 and positioned at the front part of the motor, the gear box 22 is used for accommodating the planetary gear speed reducing mechanism 31 and the pinion mechanism 30, the planetary gear speed reducing mechanism 31 and the pinion mechanism 30 are separated by arranging a partition board 221 between the planetary gear speed reducing mechanism 31 and the pinion mechanism 30, and a gear box cover plate 223 is arranged between the gear box 22 and the working head supporting mechanism, so that the transmission mechanism 3 and the working head supporting mechanism can be separated, namely, the transmission mechanism 3 and the working head supporting mechanism are independent. The pinion mechanism 30 includes a first gear 301 connected to the planetary gear reduction mechanism 31 so as to be capable of transmitting torque, a third gear 303 connected to the connecting shaft 51, and a second gear 302 meshing with the first gear 301 and the third gear 303, the second gear 302 transmitting the rotation of the first gear 301 to the third gear 303, both ends of each gear being supported by bushings. The middle part of the partition 221 is provided with a hole for the shaft of the first gear 301 to pass through, the end face of the partition 221 is provided with a groove for mounting a shaft sleeve, a rear shaft sleeve for supporting the pinion mechanism 30 is fixed on the partition 221, a front shaft sleeve is fixed on a gear box cover plate 223, and the gear box cover plate 223 is fixedly connected with the gear box 22 through screws, buckles and the like, so that the pinion mechanism 30 and the planetary gear speed reducing mechanism 31 can be separated and can be sealed at the same time, dust, powder and the like are prevented from entering the transmission mechanism 3, and the leakage of lubricating oil can also be prevented. In addition, the three gears are provided only to make the inner space of the tool more compact so as not to affect the external beauty. Of course, two gears may be provided as necessary, one being connected to the planetary gear speed reduction mechanism 31 and the other being connected to the connecting shaft 51. In addition, the transmission mechanism 3 is not limited to the above-described form, and the transmission mechanism 3 may include only the planetary gear speed reduction mechanism 31, or only the pinion gear mechanism 30, or other rotational motion transmission mechanisms such as a ratchet mechanism, a worm gear mechanism, and the like. The planetary gear reduction mechanism 31 has a three-stage reduction system, the motor shaft 21 extends to be meshed with the planetary gear reduction mechanism 31, the planetary gear reduction mechanism 31 transmits the rotation motion to the pinion mechanism 30, the pinion mechanism 30 drives the connecting shaft 51 to rotate, and the connecting shaft 51 drives the output shaft 4 to rotate. When the motor is operated, the motor is finally output from the output shaft 4 via the planetary gear reduction mechanism 31 and the pinion mechanism 30. It can be seen that the drive train in this embodiment is a motor-transmission-connecting shaft-output shaft, i.e. the connecting shaft is part of the drive train. In addition, the speed reducing mechanism is composed of a three-stage planetary speed reducing system and a two-stage parallel shaft speed reducing system to obtain the desired output speed, and in other embodiments, the speed reducing mechanism may only include a two-stage planetary speed reducing system or other speed reducing systems according to the required output speed.

The casing 1 is slidably connected with a sliding cover 53, and the sliding cover 53 can drive the connecting shaft 51 to move axially. The connecting shaft 51 is a hexagonal shaft, a fixing block 50 is axially and fixedly arranged on the connecting shaft 51, the rear end of the connecting shaft 51 can rotatably abut against the fixing block 50, and the sliding cover 53 can drive the connecting shaft 51 to move in a mode of being connected with the fixing block 50. Of course, there are many ways for the sliding cover 53 to drive the connecting shaft 51 to move, for example, a ring groove surrounding the periphery of the connecting shaft 51 may be provided on the connecting shaft 51, and the sliding cover 53 extends into the ring groove through a pin or a wire ring to connect with the connecting shaft 51, so that the rotation of the connecting shaft 51 is not affected, and the sliding cover 53 drives the connecting shaft 51 to move is also not affected. The front end of the connecting shaft 51 is provided with a magnet 511 for attracting the working head 9, when the working head 9 is selected, the sliding cover 53 can be operated to drive the connecting shaft 51 to pass through the working head supporting mechanism, the working head 9 is attracted by the magnet 511 on the connecting shaft 51, and leaves the working head supporting mechanism under the pushing of the connecting shaft 51 to enter the accommodating hole 41 of the output shaft 4.

As further shown in fig. 3 to 5, the housing 1 includes a front case 13 connected to a front end thereof, and a part of the working head support mechanism is housed in the front case 13, and the other part is covered by the slide cover 53 and exposed as the slide cover 53 moves. The front housing 13 has an accommodating space for accommodating the working head support mechanism, the working head support mechanism has an axially extending centerline, the working head support mechanism is rotatable around its centerline in the accommodating space, and the working head support mechanism has front and rear end faces and a surrounding face located between the front and rear end faces along its centerline. The preferred work head support mechanism of the present invention is a cylindrical storage clamp 52, and the storage clamp 52 is configured in such a way that it is not only convenient to rotate, but also occupies a small space, and of course, the storage clamp 52 may be configured in a square, triangular, strip, bracket shape, etc. When the electric screwdriver is operated, the sliding cover 53 abuts against the front housing 13, that is, the sliding cover 53 is in the initial position, and the storage clip 52 and the connecting shaft 51 are both closed, so that dust is prevented from entering. When the slide cover 53 is moved to the rearmost position, i.e., the slide cover is in the second position, the connecting shaft 51 is not exposed, so that dust, powder, etc. are prevented from entering the inside of the tool. In the process of replacing the working heads, the sliding cover 53 is moved to the second position to drive the connecting shaft 51 to exit from the storage clamp 52, the working head 9 is attracted by the magnet 511 on the connecting shaft 51 and leaves the accommodating hole 41 of the output shaft 4 to enter the accommodating cavity 521 of the storage clamp 52 under the driving of the connecting shaft 51, and at this time, an operator can conveniently select a required working head by rotating the storage clamp 52. The sliding cover 53 has a certain length, and when the sliding cover 53 moves to the working position abutting against the front shell 13, the sliding cover 53 is axially overlapped with the storage part B and the transmission part C; when the sliding cover 53 moves to the position where the working head can be replaced, the sliding cover 53 axially overlaps the motor part D and partially axially overlaps the transmission part C. Of course, there are many ways to move the sliding cover 53, for example, the sliding cover 53 can be rotatably installed on the housing 1, and can rotate between two positions for covering the storage clip 52 and exposing the storage clip 52; or may be opened or closed in a manner similar to a sliding door; or pivotally connected to the housing 1, etc., to close the storage clamp 52 during operation and expose the storage clamp 52 when the working head needs to be replaced.

The storage clamp 52 is rotatably supported in the front housing 13 between the gear box cover plate 223 and the output shaft 4, a plurality of working head accommodating chambers 521 are uniformly distributed on the storage clamp 52 along the circumferential direction, that is, the working heads have a plurality of accommodating spaces, and the plurality of accommodating spaces are arranged in parallel along the rotation axis of the storage clamp 52. The working head accommodating bin 521 is closed along a part of the outer circumference of the axial direction of the storage clamp 52, and is opened along a part of the outer circumference, so that an operator can easily see the shape of the head of the working head 9 from the opened part when selecting the working head 9, and the required working head 9 can be quickly selected. Of course, it is easy for those skilled in the art to understand that the outer circumference of the working head storage bin 521 may also be fully enclosed, and only the corresponding position needs to be marked, or the storage clip 52 is directly made transparent, which is convenient for identification. The operator can rotate the storage clamp 52 to make one of the working heads 9 of the storage bin 521 correspond to the storage hole 41 of the output shaft 4.

The output shaft 4 has an output shaft centre line X1, the output shaft 4 is supported to the front housing 13 by a sleeve 40, the sleeve 40 provides radial support for the output shaft 4, although radial support of the output shaft 4 may be achieved by bearings. According to the invention, the connecting shaft 51 is hexagonal, the third gear 303 is internally provided with a hexagonal hole and is used for being matched and connected with the connecting shaft 51 and transmitting the rotating power to the connecting shaft 51, so that the connecting shaft 51 is inserted into the output shaft 4 to drive the output shaft 4 to rotate, and further the output shaft 4 drives the working head 9 to rotate, thus the standard working head 9 can be used, a hole for accommodating the working head 9 is not required to be formed in the connecting shaft 51, and the phenomenon that the diameter of the connecting shaft 51 is too large and the weight and the volume of the whole machine. Therefore, the working head 9 is directly driven to rotate to form an output shaft, the torque transmission distance is shortened, and the tool is more reliable to use. The above description is about the manner in which the connecting shaft 51 indirectly drives the working head to rotate through the output shaft 4, however, those skilled in the art can easily think of other transmission manners to substitute, for example, the connecting shaft directly drives the working head to rotate, that is, the connecting shaft is directly connected with the working head in a manner of transmitting torque, or the output shaft is directly driven by a gear, and the connecting shaft is only used for pushing out the working head and driving the working head to return to the storage clip.

The front shell 13 is movably connected to the housing 1 by a pivot shaft, and the center line of the pivot shaft is perpendicular to the center line X1 of the output shaft. The front housing 13 in this embodiment is pinned to the two sides of the housing 1 by two pins 42, and the central line of the pins 42 is the center line of the pivot 42. Of course, other ways of movably connecting to the housing 1 may be envisaged by the person skilled in the art.

Referring further to fig. 6, when the sliding cover 53 slides to the second position, the storage clip 52 originally covered by the sliding cover 53 is exposed, the front housing 13 is provided with a window 28 penetrating through the storage space of the storage clip 52, and an operator can toggle the storage clip 52 through the window 28 to rotate in the front housing 13 until the required working head 9 position corresponds to the receiving hole 28 of the output shaft 4, where the corresponding position is a position where the working head 9 of the storage clip 52 is approximately aligned with the receiving hole 28, and a person skilled in the art can easily think that the working head 9 can be conveniently guided into the receiving hole 28 of the output shaft 4 from the working head receiving bin 521 of the storage clip 52 by providing a guiding mechanism in the receiving hole 28 of the output shaft 4 or between the receiving hole 28 and the storage clip 52, and the connecting shaft 51 can conveniently send the working head 9 into the receiving hole 28 of the output shaft 4 through the sliding cover 53. The storage clip 52 is received in the front housing 13, and the front housing 13 of this embodiment serves as a holder for supporting the storage clip 52. Between the housing 1 and the holder, a holding mechanism 17 is arranged, which holding mechanism 17 is able to hold the holder in the first or second position. The holding mechanism 17 includes a pin 18 abutting on the support, and an elastic member 19 provided between the pin 18 and the casing 1. Under normal conditions, the elastic element 19 biases the pin 18 to keep the seat in the first position; when the support is pivoted to the second position against the resilient member 19 by an external force, the resilient member 19 biases the pin 18 to maintain the support in the second position.

The slide cover 53 corresponds to an operating mechanism provided on the housing 1, and the operating mechanism is movable between an initial position and an operating position with respect to the housing. Of course the operating mechanism may be replaced by other means as readily appreciated by the person skilled in the art, such as a manually controlled operating lever or the like. A locking mechanism is arranged between the support 13 and the casing, when the operating mechanism is positioned at the initial position, the locking mechanism acts on the support and limits the movement of the support, and when the operating mechanism is positioned at the working position, the locking mechanism releases the limit on the support.

Referring to fig. 7 and 8, a locking mechanism is disposed between the support 13 and the casing 1, and the locking mechanism includes a stopper 16 disposed on the sliding cover 53, and a stopper 14 disposed on the support and coupled to the stopper 16. When the stopper 16 is mated with the stopper 14, the sliding cover 53 closes the window 28 of the support 13 and prevents the support from rotating around the pivot 42, and the support is in the first position; when stop 16 is disengaged from stop 14, window 28 is opened and the support is allowed to pivot about pivot 42 to the second position. When the support is at the first position, the center line of the storage clip is approximately parallel to the connecting shaft 51, at this time, the sliding cover 53 is moved axially to expose the storage clip 52, and the storable clip 52 can be adjusted to a position where one of the working heads corresponds to the output shaft receiving hole 41 through the window 28. When the holder is pivoted to a second position relative to the housing 1, the storage clip centerline is disposed at an angle to the connecting shaft 51. In this embodiment, when the support is pivoted to the second position, the centerline of the storage clip is substantially at a right angle of 90 degrees with the connecting shaft 51, the output shaft 4 pivots from the horizontal direction to the vertical direction along with the support, at this time, the end surface of the support matched with the machine case 1 forms the opening 130, the end surface of one side of the storage clip 52 is exposed from the opening 130, that is, the accommodating bin 521 is exposed outside the machine case 1, and at this time, the operator takes out the working head from the accommodating bin 521 for replacement. The storage clip 52 may also be removed from the opening 130 along the output shaft centerline X1 to disengage the storage clip 52 from the support. Fig. 8 shows the storage holder 52 in the support in a position shown by solid lines to a position shown by broken lines in the direction of the arrow, the storage holder 52 being removable from the support, the working head being separated from the support together with the storage holder 52, the storage holder being separated from the support to facilitate the removal of the working head therefrom.

Referring to fig. 9 and 10, the electric screwdriver according to the second embodiment of the present invention has a similar structure to that of the first embodiment, except for the arrangement of the holder 55, so that the same components are denoted by the same reference numerals and are not described again. The sliding cover 53 ' can axially slide along the groove 54 between a first position and a second position relative to the housing 1 ', and when the first position is reached, the sliding cover 53 ' drives the connecting shaft 51 to pass through the accommodating cavity 521 of the storage clip 52, and pushes the working head accommodated in the accommodating cavity 521 of the storage clip 52 into the accommodating hole 41 of the output shaft 4; in the second position, the slide cover 53' drives the connecting shaft 51 to move, so that the working head 9 adsorbed on the magnet 511 exits the accommodating hole 41 of the output shaft 4 along with the connecting shaft 51 and enters the accommodating hole 521 of the storage clip 52. A support 55 for supporting the storage clip 52 is movably disposed in the front housing 15, and a window 28 'is provided on the support 55, through which window 28' an operator can view a portion of the working heads, including the current or next working head, in the storage clip 52.

Referring to fig. 11 and 12, when the sliding cover 53 'slides along the groove 54 to the second position, the connecting shaft 51 simultaneously moves axially to a release position separated from one of the plurality of working heads, and at this time, an operator can conveniently and manually dial the storage clip 52 through the window 28' to rotate in the support 55, so that one of the plurality of working heads accommodated in the accommodating hole 521 of the storage clip 52 corresponds to the output shaft accommodating hole 41, and at this time, the support 55 is at an initial position. The carrier 55 in this embodiment is pivotable relative to the front housing 15 about a carrier pivot 55a, the centerline of the pivot 55a being substantially parallel to the output shaft centerline X1. When the support 55 is in the initial position, the connecting shaft 51 is substantially parallel to the centerline of the storage clip, and when the support 55 is pivoted to the second position, the centerline of the storage clip is radially offset from the connecting shaft 51, so that the at least one storage bin 521 is exposed outside the casing 1'. At this time, the working head 9 accommodated in the accommodating hole 521 of the storage clip 52 can be directly separated from the support 55 along the output shaft center line X1. Of course, the pivoting angle of the support 55 can be set as required, when the storage clip 52 pivots with the support 55 to be exposed from the casing 1', the openings (not shown) of the front and rear end surfaces of the support 55 along the direction of the pivot 55a are exposed, respectively, and the front end surface and the rear end surface of the storage clip 52 are exposed from the opening of the front end surface and the opening of the rear end surface of the storage clip 52, respectively, at this time, the storage clip 52 can be taken out from the support 55 along the output shaft center line X1 from the opening of the front end surface and the opening of the rear end surface of the support 55, that is, the whole storage clip 52 can be separated from the support 55 along the output shaft center line X1; the storage clip is more convenient for the working head to be taken out of the support 55 after being separated from the support. The support 55 of this embodiment is provided with windows 28' on both sides of the pivot 55a. The sliding cover 53' of the present embodiment belongs to an operating mechanism for controlling the axial movement of the connecting shaft 51, which is movable relative to the casing 1 between an initial position, in which the operating mechanism acts on the support 55 and limits the movement of the support 55, and an operating position, in which the operating mechanism releases the limit on the support 55. A locking mechanism is provided between the support 55 and the casing 1 ', and locks or releases the locking of the support 55 according to the position change of the sliding cover 53'.

Referring to fig. 13 to 15, the locking mechanism includes a recess provided on the support 55, the recess preferably adopts a V-shaped groove 56, a positioning pin 60 provided on the casing 1 ', a spring 62 biasing the positioning pin 60, and a top post 64 moving with the slide cover 53 ', one end 60a of the positioning pin 60 is engaged in the V-shaped groove 56, when the top post 64 is abutted against the positioning pin 60, the top post 64 presses the engaged position of the positioning pin 60 and the V-shaped groove 56, and the position of the support 55 relative to the casing 1 ' is locked; when the top post 64 is moved out of abutment with the detent pin 60 as the slide cover 53 'is moved, the abutment 55 can be disengaged from the detent pin 60 as long as the operator applies pressure to the abutment 55 against the action of the spring 62, thereby allowing the abutment 55 to pivot to a second position relative to the housing 1', with the spring 62 in compression. A retaining mechanism (not shown) similar to the first embodiment is also provided between the support 55 and the casing 1' so that the support 55 can retain its position under the action of the elastic member in both the first position and the second position, and the support can pivot from the first position to the second position or from the second position to the first position only when the support 55 is subjected to an external force sufficient to overcome the elasticity of the elastic member; the purpose of the retaining mechanism is to make the connection between the support 55 and the casing 1' stable and reliable.

The above definitions of the various elements are not limited to the various specific configurations or shapes mentioned in the embodiments, and may be easily and commonly replaced by those skilled in the art. For example, the motor can be a gasoline engine or a diesel engine and the like to replace the motor; the cross section of the working head is any regular polygon; in addition, in the above embodiment, the relative axial movement between the connecting shaft and the working head storage clamp may also be that the connecting shaft is fixed, and the working head storage clamp can move axially and also rotate, and the connecting shaft may also be arranged coaxially with the motor shaft, and so on. In addition, the elastic pressing device is mainly used for guiding the relative position of the working head and the torque transmission part, has no special requirement on the structure, can change the configuration correspondingly according to different internal patterns, can add new elements and can reduce unnecessary elements.

Claims

1. A power tool, comprising:

a housing;

a motor disposed in the housing and outputting rotational power;

the output shaft is provided with an accommodating hole which is axially arranged and used for accommodating the working head;

the transmission mechanism is arranged between the motor and the output shaft and can transmit the rotary power output by the motor to the output shaft;

the storage clamp comprises a storage cabin for accommodating a plurality of working heads arranged in parallel, and the storage clamp is provided with a storage clamp center line;

the transmission mechanism comprises a connecting shaft which transmits the rotation motion of the motor to the output shaft, and the connecting shaft can penetrate through the containing bin to be matched and connected with one of the working heads or be separated from one of the working heads;

the method is characterized in that: the power tool also comprises a support for supporting the storage clamp, the support can move between a first position and a second position relative to the machine shell, when the support is located at the first position, the storage clamp can be operatively adjusted to a position where one of the working heads corresponds to the receiving hole of the output shaft, and when the support is located at the second position, the working heads can be operatively taken out of the storage clamp.

2. The power tool of claim 1, wherein: when the support is located at the second position, the working head is separated from the storage clamp along the direction of the central line of the output shaft.

3. The power tool of claim 1, wherein: the storage clip is operable to separate from the seat in a direction of a centerline of the output shaft when the seat is in the second position.

4. The power tool of claim 1, wherein: when the support is located at the second position, the center line of the storage clamp and the connecting shaft are arranged at an angle.

5. The power tool of claim 1, wherein: when the support is located at the second position, the central line of the storage clamp is radially deviated from the connecting shaft, and at least one containing bin is exposed out of the machine shell.

6. The power tool of claim 1, wherein: the support is pivotally arranged relative to the housing.

7. The power tool of claim 6, wherein: the pivot axis of the support is parallel to the central line of the output shaft.

8. The power tool of claim 6, wherein: the pivot axis of the support is arranged at an angle with the central line of the output shaft.

9. The power tool of claim 6, wherein: the output shaft is fixedly arranged relative to the support.

10. The power tool of claim 1, wherein: the storage clip is rotatable relative to the support base about a storage clip centerline.

11. The power tool of claim 10, wherein: the support is provided with a window, and when the support is located at the first position, the storage clamp can be driven to rotate to a position where one of the working heads is aligned with the receiving hole of the output shaft through the window.

12. The power tool of claim 1, wherein: the shell is provided with an operating mechanism which can move between an initial position and a working position relative to the shell.

13. The power tool of claim 12, wherein: the operating mechanism comprises a sliding cover, and the sliding cover can slide along the axial direction relative to the machine shell.

14. The power tool of claim 13, wherein: a locking mechanism is arranged between the support and the casing, when the operating mechanism is located at an initial position, the locking mechanism acts on the support and limits the support to move, and when the operating mechanism is located at a working position, the locking mechanism releases the limit on the support.

15. The power tool of claim 14, wherein: the locking mechanism comprises a stop block arranged on the sliding cover and a stop head arranged on the support, when the operating mechanism is located at an initial position, the stop block is matched and connected with the stop head to prevent the support from moving, and when the operating mechanism is located at a working position, the stop block is separated from the stop head to allow the support to move.

16. The power tool of claim 14, wherein: the locking mechanism comprises a groove arranged on the support, a positioning pin arranged on the shell, a spring biasing the positioning pin and a top column moving along with the sliding cover, the end part of the positioning pin is meshed with the groove, when the top column is abutted against the positioning pin, the position of the support relative to the shell is locked, and when the top column is separated from the positioning pin, the support overcomes the action force of the spring to be separated from the engagement with the positioning pin, so that the support is allowed to move relative to the shell.

17. The power tool of claim 1, wherein: and a retaining mechanism is arranged between the machine shell and the support, and can keep the support at the first position or the second position.

18. The power tool of claim 17, wherein: the holding mechanism comprises a pin abutted to the support and an elastic piece arranged between the pin and the shell.

19. A power tool, comprising:

a housing;

a motor disposed in the housing and outputting rotational power;

the storage clamp comprises a containing bin for containing a plurality of working heads arranged in parallel, and the storage clamp is provided with a storage clamp center line and can rotate around the storage clamp center line;

the method is characterized in that: the storage clamp can pivot between a first position and a second position around a first axis, when the storage clamp is located at the first position, the storage clamp can be operatively adjusted to a position where one of the working heads corresponds to the output shaft accommodating hole, and when the storage clamp is located at the second position, the working heads are in a state that the working heads can be operatively taken out of the storage clamp.

20. The power tool of claim 19, wherein: when the storage clip is located at the second position, at least one of the storage bins is exposed outside the casing.

21. The power tool of claim 19, wherein: the power tool further includes a support for supporting the storage clip, the support being pivotally disposed relative to the housing, the first axis being a pivot axis of the support.

22. A method of operating a power tool for changing a work head, the power tool as claimed in claim 1, the method comprising the steps of: 1) the connecting shaft moves axially relative to the storage clamp to a release position separated from one of the working heads; 2) moving the support from the first position to the second position; 3) and separating the working head from the support or separating the storage clamp from the support.

23. The method of operating a power tool for changing a work head of claim 22, wherein: the support is moved from the first position to the second position by pivoting.

24. The method of operating a power tool for changing a work head of claim 22, wherein: the output shaft is provided with a center line, and the working head is separated from the support or the storage clamp is separated from the support along the direction of the center line of the output shaft.