CN215357777U

CN215357777U - Multifunctional electric tool

Info

Publication number: CN215357777U
Application number: CN202120498423.6U
Authority: CN
Inventors: 陆传洋; 张成龙
Original assignee: Nanjing Jiuchi Electromechanical Industry Co ltd
Current assignee: Nanjing Jiuchi Electromechanical Industry Co ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-12-31
Anticipated expiration: 2031-03-09

Abstract

The utility model relates to a multifunctional electric tool, and belongs to the technical field of electric tools. The tool comprises a tool driving mechanism which can move around the axis of an output shaft, wherein the tool driving mechanism comprises at least one hanging device, a clamping device and a locking device; the hoisting device can apply tension to the clamping device, the clamping device is provided with an opening position and a closing position, and the locking device is provided with an unlocking position and a locking position; the force exerted by the tool bit on the locking means moves the locking means from the locked position to the unlocked position; the locking device is used for locking the hoisting device at least one locking position to release the tension force applied to the clamping device by the hoisting device. After the tool head clamping device is adopted, the tool head can be installed by one hand only by pressing down the locking device, and meanwhile, the disturbed instability is completely eradicated, and the clamping device is more stable and reliable in opening, clamping, closing and releasing and position conversion.

Description

Multifunctional electric tool

Technical Field

The utility model relates to a handheld electric tool, in particular to a multifunctional electric tool, and belongs to the technical field of electric tools.

Background

Among the conventional electric tools, there is a type of multifunctional electric tool in which a tool bit needs to be frequently replaced according to an operation condition, and most representative of the multifunctional electric tools are disclosed in chinese patent documents having application numbers 201210332520.3 and 201380021580.6. The output shaft of the tool swings around the axis of the tool to drive the working head (comprising a straight saw blade, a circular saw blade, a triangular sanding disc and a shovel-type scraper) arranged at the shaft end to move along with the tool, so that various operations such as sawing, cutting, sanding, scraping and the like can be realized.

In order to meet the requirement for quick replacement of various types or sizes of tool heads, such as knives, during use, quick change devices for tool heads have been developed. Chinese patent documents with application numbers 201480043554.8, 201510120755.X and 201610221396.1 respectively disclose different technical schemes for quick-change structures. However, these solutions do not require two hands to operate when the tool head is not suddenly detached or installed, and thus, they do not bring the maximum convenience to the user.

It is known from the state of the art that chinese patent application No. 201480043554.8 discloses a tool machine with a tool receiving device movable about a drive shaft, wherein the tool receiving device is designed for holding the tool device on the tool machine such that the drive shaft substantially coincides with a tool rotation axis, wherein the tool receiving device has at least one tensioning device, at least one holding device and at least one locking device, wherein the holding device is movable from at least one first, open position into at least one second, closed position, wherein the holding device can also be applied with a tensioning force by the tensioning device, wherein the locking device is movable between at least one first, locked position and at least one second, unlocked position, wherein the locking device is designed for cooperating with the holding device, wherein movement of the retaining means can be prevented in at least one locking position by the locking means, and wherein the locking means is arranged such that a force exerted indirectly or directly on the locking means by the tool means moves the locking means from one of the plurality of locking positions to one of the plurality of unlocking positions. Wherein the 'synergistic effect' is defined in the section [ 0017 ] of the specification as follows: the movement of the holding device can be influenced indirectly or directly by the locking device. The technical scheme creates the quick clamping with a unique structure, so that the tool head which is called as one touch in the industry can be installed, namely, the tool head can be installed by one hand only by pressing down the locking device, and therefore, the tool device can be installed in a machine particularly quickly and simply.

However, as can be seen from analysis, the technical solution is based on the principle of the bistable mechanism of the spring under the action of the tension force, and it is not difficult to verify through experiments only by using the technical solution of the independent patent claim, because the position of the holding device, which is prevented from moving by the locking device, is in the stable state still being acted by the tension force after being limited, the locking device will always indirectly or directly influence the movement of the holding device, and therefore when the locking device is disturbed, the locking device will be pulled to influence the holding device, there is a possibility of malfunction caused by disengagement from the stable state, and it is difficult to ensure that the locking device is in the stable and reliable state of being prevented from moving. All products on the market corresponding to this patent have been objectively validated by the presence of an expansion bayonet at one end of the guide recess 5e and by the addition of a belleville spring (see its figure 2, the lower part of which is shown by two parallel vertical lines at the left end of the pieces 4a, 4 b) which makes the retaining device less susceptible to disturbance and instability.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: aiming at the defects existing in the prior art, the multifunctional electric tool is provided by structural improvement, which can thoroughly avoid the misoperation caused by the cooperative action of the locking device and the retaining device, thereby ensuring the stable and reliable action of the retaining device.

In order to achieve the above object, the multi-function power tool of the present invention comprises a tool driving mechanism movable about an output shaft axis, the tool driving mechanism including at least one clinching device, at least one clamping device, and at least one locking device;

said clamping means being adapted to apply a tension to said clamping means, said clamping means having at least one open position for clamping the tool bit and at least one closed position for releasing the tool bit, said locking means having at least one unlocked position for releasing the clamping means and at least one locked position for blocking the clamping means; the force exerted by the tool head on the locking device moves the locking device from one of the plurality of locking positions to one of the plurality of unlocking positions;

the locking device is used for locking the hoisting device at least one locking position to release the tension force applied to the clamping device by the hoisting device.

After the clamping device is adopted, the novel purpose that the locking device and the clamping device can be realized only by the synergistic action in the prior art is avoided, namely, the locking device cannot be dragged by the displacement of the clamping device; and the locking device relieves the tension force applied by the hoisting device to the clamping device at the locking position, so that the clamping device is in a completely stable balanced state without the help of a bistable mechanism, and the clamping device thoroughly avoids the instability after being disturbed while having the advantage that the tool head can be installed by one hand only by pressing down the locking device, and is more stable and reliable no matter the clamping device is opened, clamped and closed to release, or the position conversion is carried out.

Further, the locking device includes at least one trigger member that moves the locking device from the locked position to the unlocked position when acted upon by the tool bit.

Furthermore, locking means becomes sliding fit's lock ring and the locking piece that is arranged in the lock ring hole by excircle and output shaft hole and constitutes, trigger part be by the radial at least one unlocking claw that can surpass hollow output shaft lower extreme that extends of lock ring.

Furthermore, the hanging device is composed of a pull rod which is arranged in the output shaft in a penetrating way and a hanging spring which is sleeved on the pull rod; the pull rod is provided with a recess into which the locking element can be snapped, the locking element being constrained in a radial bore of a fixing ring fixed to the lower part of the output shaft.

Further, when the locking device is in the locking position, the pull rod of the hoisting device is locked through the locking piece, so that the tension force applied to the clamping device by the hoisting device is relieved.

Further, the radial perforation on the upper portion of the fixing ring extends into an inner hole of the locking ring, and the inner hole of the locking ring is provided with a small-diameter section pressing the locking piece to the depression of the pull rod and an expanding section allowing the locking piece to be separated from the depression of the pull rod.

Furthermore, the clamping device mainly comprises a pair of chucks, the upper parts of which are provided with sliding chutes, the middle parts of which are provided with hinged holes, and the lower parts of which are provided with outer hook legs; the chuck is hinged to the lower portion of the output shaft through a hinge pin penetrating through the hinge hole.

Furthermore, the forked lower end of the pull rod is provided with a sliding pin which forms a sliding pair with the sliding groove of the chuck.

Furthermore, the lower end of the hoisting spring is limited in the middle step in the output shaft, and the upper end of the hoisting spring is pressed and held by a hoisting fastener screwed on the pull rod; a lower compression spring positioned between the hoisting fastening piece and the locking ring is arranged in a hoisting spring of the pull rod; the rigidity of the lower compression spring is smaller than that of the hanging spring.

Further, the hinge pin is used for fixing the fixing ring and the tool head positioning disc at the lower end of the output shaft.

Drawings

The utility model will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic view of the overall structure of an embodiment of the present invention.

Fig. 2 is a schematic perspective exploded view of a portion of the tool drive mechanism of the embodiment of fig. 1.

Fig. 3 is a schematic structural view of the locking device of the embodiment of fig. 1 in a releasing state and a clamping device in an opening and clamping state.

Fig. 4 is a sectional view a-a of fig. 3.

Fig. 5 is a schematic structural diagram of a locking state and a clamping state of the locking device of the embodiment of fig. 1.

Fig. 6 is a sectional view a-a of fig. 5.

Detailed Description

Example one

The basic structure of the multifunctional electric tool of the present embodiment is as shown in fig. 1, and a driving motor is installed in a main body B, a tool driving mechanism a is provided at the front end, and a battery pack C is inserted at the rear end.

The tool drive a (corresponding to the tool receiver of the prior art) can pivot about the axis of a hollow output shaft 6 (corresponding to the drive shaft of the prior art) driven by a drive motor via a transmission mechanism. The tool drive a comprises a hitch device (corresponding to a tensioning device of the prior art), a holding device (corresponding to a retaining device of the prior art) and a locking device (corresponding to a locking device of the prior art).

Wherein, the hoisting device mainly comprises a pull rod 9 which is arranged in the output shaft 6 in a penetrating way and a hoisting spring 4 which is sleeved on the pull rod 9; the clamping device mainly comprises a pair of chucks 12 with sliding grooves 12-1 at the upper part, hinged holes at the middle part and external hook legs 12-2 at the lower part; the locking device mainly comprises a locking ring 7 with an outer circle in sliding fit with an inner hole of the output shaft 6 and a locking ball 10 positioned in the inner hole of the locking ring 7.

When the clamping device is installed, the lower end of the hoisting spring 4 is limited in the middle step 6-1 in the output shaft 6, the upper end of the hoisting spring is pressed and held by the hoisting nut 1 screwed on the pull rod 9 through the elastic pad 2 and the gasket 3, and the forked lower end of the pull rod 9 is provided with the sliding pin 11 which forms a sliding pair with the sliding groove of the chuck 12, so that the hoisting device can apply tensioning force to the clamping device.

The pull rod 9 is formed with a recess 9-1 into which a locking ball 10 can be snapped, the locking ball 10 being constrained in a radial bore of a fixing ring 8 fixed to the lower part of the output shaft 6 and thus being movable only in the radial direction. The radial through hole at the upper part of the fixed ring 8 extends into the inner hole of the locking ring 7, and the inner hole of the locking ring 7 is provided with a small-diameter section which presses the locking ball 10 to the depression of the pull rod 9 and a diameter-expanding section which allows the locking ball 10 to be separated from the depression of the pull rod 9; the locking ring 7 may extend radially beyond a pair of unlocking claws 7-1 at the lower end of the hollow output shaft 6.

A jaw 12 of the clamping device is hinged to the lower portion of the output shaft 6 via a hinge pin 13 passing through a hinge hole, and has an open position (see fig. 3) clamping a saw blade 14 as a tool head and a closed position (see fig. 5) releasing the saw blade 14; the locking device has an unlocked position (see fig. 3) in which the clamping device is released, i.e. allowed to move, and a locked position (see fig. 5) in which the clamping device is blocked, i.e. not allowed to move. And meanwhile, the hinge pin 13 also fixes the fixing ring 8 and the tool head positioning disk 6-2 at the lower end of the output shaft 6.

When the unlocking claws of the locking ring 7 in the locking device are acted upon by the upward force of the saw blade 14, the locking device can be moved from a locking position, in which the locking balls 10 are pressed into the recesses of the pull rod 9 and the two clamping jaws 12 of the clamping device are blocked and cannot move, as shown in fig. 5, to an unlocking position, in which the locking balls 10 are released from the recesses of the pull rod 9 and the two clamping jaws 12 of the clamping device are released and can move, as shown in fig. 3. Then, the lock device locks the pull rod 9 of the hoist device by the lock ball at the lock position shown in fig. 5, so that the biasing force of the hoist spring 4 is not applied to both chucks 12, and the tightening force applied to the clamp device by the hoist device is released.

In order to ensure a secure locking of the locking device in position when the locking device is switched from the unlocking position to the locking position, the tension spring 4 of the pull rod 9 is also provided with a hold-down spring 5 located between the tension nut 1 and the locking ring 7. The rigidity of the lower compression spring 5 is less than that of the hanging spring 4.

When the pull rod 9 is in the unlocking position shown in fig. 3 and 4, under the upward hanging force of the hanging spring 4, the slide pin 11 at the lower end of the pull rod applies torque outwards turning around the hinge pin 13 to the clamping heads 12 through the slide groove 12-1, so that the outer hook legs 12-2 of the two clamping heads 12 are respectively upwards tilted from two sides to clamp the saw blade 14 oriented by the tool head positioning disc 6-2. Meanwhile, the locking ball 10 is forced to be extruded outwards from the depression 9-1 of the pull rod because the pull rod 9 is in the hoisting and rising position, and the traction locking ring 7 is lifted to a position where the expanded diameter section allows the locking ball 10 to be separated from the depression of the pull rod 9 by overcoming the acting force of the lower compression spring 5.

In operation, when the saw blade 14 needs to be replaced, the wrench D at the upper end of the driving mechanism A of the wrenching tool is used for pressing the pull rod 9 downwards against the upward hanging force of the hanging spring 4, the slide pin 11 at the lower end of the driving mechanism A applies torque around the hinge pin 13 to the clamping heads 12 through the slide groove 12-1, so that the outer hook feet 12-2 of the two clamping heads 12 are closed, and the saw blade 14 is released, so that the saw blade can be replaced as required. Meanwhile, the locking balls 10 correspond to the depressions 9-1 of the pull rod due to the fact that the pull rod 9 is pressed down, the locking ring 7 descends to a small-diameter section under the action of the lower compression spring 5 to press the locking balls 10 inwards, the locking balls are clamped into the depressions of the pull rod 9, and the pull rod 9 is locked. At this time, since the locking device actually isolates the tightening force of the hoist spring 4 to the chuck 12, the clamping device is in a stable closed equilibrium state, and there is no fear of malfunction due to disturbance. Only when the unlocking claw 7-1 of the locking ring 7 is acted upon by the upward force of the saw blade 14 does the chuck 12 release the clamping device by the locking ball 10 falling out of the recess of the pull rod 9, and the chuck returns to the open clamping state shown in fig. 3 and 4 by the action of the suspension spring 4 transmitted by the pull rod 9.

In addition to the above embodiments, the present invention may have other embodiments. For example, the locking balls may be replaced with locking pins; the lower compression spring can be replaced by a butterfly spring; in particular, the locking devices disclosed in the patent documents are of various types (e.g., 201580009468, 201310193660, etc.), and any solution that is formed by equivalent substitution or equivalent transformation falls within the scope of protection claimed by the present invention.

Claims

1. A multifunctional power tool comprises a tool driving mechanism capable of moving around an output shaft axis, wherein the tool driving mechanism comprises at least one hanging device, at least one clamping device and at least one locking device;

said clamping device having at least one open position for clamping the tool bit and at least one closed position for releasing the tool bit, said locking device having at least one unlocked position for releasing the clamping device and at least one locked position for blocking the clamping device; the force exerted by the tool head on the locking device moves the locking device from one of the plurality of locking positions to one of the plurality of unlocking positions;

the method is characterized in that: the locking device is used for locking the hoisting device at least one locking position to release the tension force applied to the clamping device by the hoisting device.

2. The multi-function power tool of claim 1, wherein: the locking device includes at least one trigger member that moves the locking device from a locked position to an unlocked position when acted upon by the tool bit.

3. The multi-function power tool of claim 2, wherein: the locking device comprises a locking ring with an excircle in sliding fit with an inner hole of the output shaft and a locking piece positioned in the inner hole of the locking ring, and the triggering part is at least one unlocking claw which radially extends from the locking ring and can exceed the lower end of the hollow output shaft.

4. The multi-function power tool of claim 3, wherein: the hoisting device consists of a pull rod penetrating in the output shaft and a hoisting spring sleeved on the pull rod; the pull rod is provided with a recess into which the locking element can be snapped, the locking element being constrained in a radial bore of a fixing ring fixed to the lower part of the output shaft.

5. The multi-function power tool of claim 4, wherein: when the locking device is in the locking position, the pull rod of the hoisting device is locked by the locking piece, so that the tension force applied to the clamping device by the hoisting device is relieved.

6. The multi-function power tool of claim 5, wherein: the radial through hole in the upper portion of the fixing ring extends into an inner hole of the locking ring, and the inner hole of the locking ring is provided with a small-diameter section pressing the locking piece to the depression of the pull rod and an expanding section allowing the locking piece to be separated from the depression of the pull rod.

7. The multi-function power tool of claim 6, wherein: the clamping device mainly comprises a pair of chucks, the upper parts of which are provided with sliding chutes, the middle parts of which are provided with hinged holes, and the lower parts of which are provided with outer hook legs; the chuck is hinged to the lower portion of the output shaft through a hinge pin penetrating through the hinge hole.

8. The multi-function power tool of claim 7, wherein: the fork-shaped lower end of the pull rod is provided with a sliding pin which forms a sliding pair with the chuck sliding groove.

9. The multi-function power tool of claim 8, wherein: the lower end of the hoisting spring is limited in the middle step in the output shaft, and the upper end of the hoisting spring is pressed and held by a hoisting fastener screwed on the pull rod; a lower compression spring positioned between the hoisting fastening piece and the locking ring is arranged in a hoisting spring of the pull rod; the rigidity of the lower compression spring is smaller than that of the hanging spring.

10. The multi-function power tool of claim 9, wherein: the hinge pin also fixes the fixing ring and the tool head positioning disc at the lower end of the output shaft.