CN213755805U - Quick clamping device and working tool comprising same - Google Patents

Abstract

The utility model provides a press from both sides device soon and press from both sides the operation instrument of device including this soon. The quick clamping device is used for installing and disassembling operation parts and comprises: a quick clamping body which is formed with a cavity which is opened at the front side of the quick clamping body to receive a working component, and is opened on the upper surface thereof with a plurality of first through holes each extending downward and communicating with the cavity; a plurality of positioning pins respectively arranged in the corresponding first through holes; an eccentric mechanism provided above the quick clamping body, the eccentric mechanism acting on an upper portion of each positioning pin by rotating the eccentric mechanism to a locked position, thereby moving each positioning pin downward to a position abutting against the working member, and each positioning pin being movable upward to a position releasing the working member by rotating the eccentric mechanism to an unlocked position. Use the utility model discloses a press from both sides the device soon, can improve the positioning accuracy of operation part, the life of this quick operation instrument who presss from both sides the device soon is used in the extension.

Description

Quick clamping device and working tool comprising same

Technical Field

The utility model relates to a press from both sides device soon and have this operation instrument who presss from both sides device soon, operation instrument is pruning scissors, reciprocating saw or multi-functional shearing tool especially.

Background

People often use a plurality of working tools in daily life, and in order to complete a certain work, different working tools are replaced sometimes to be successfully completed. For example, in gardening trimming, pruning shears and reciprocating saws are often used. The pruning shears work by means of impact type shearing force, and are suitable for pruning thin and soft vines and branches, while the reciprocating saw is suitable for sawing thick and hard dry branches, but is difficult to saw thin and soft vines and branches.

In order to facilitate work of people, a plurality of multifunctional tools are used in real time, and most of the multifunctional tools utilize the same machine body to realize functional diversity by replacing a cutting tool. Thus, reliability and rapidity of the quick clamping device as the tool chuck are very important. In the prior art, the positioning of the quick clamping device is realized by a single cylindrical positioning pin and side positioning, the positioning precision of the positioning mode is not high, the cutter installed by the quick clamping device swings greatly when moving at high speed, and the service life of a machine is greatly influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is an object of the present invention to provide a quick clamping device with a plurality of positioning members and an action tool including the quick clamping device.

The utility model provides a fast clamp device for installation and dismantlement operation part, fast clamp device includes: a quick clamping body which is formed with a cavity for accommodating a rear part of the working component, the cavity being open at a front side of the quick clamping body to receive the working component, and a plurality of first through holes each extending downward and communicating with the cavity being opened on an upper surface of the quick clamping body; a plurality of positioning pins, the number of which is equal to the number of the first through holes, and the plurality of positioning pins are respectively arranged in the corresponding first through holes; an eccentric mechanism provided above the quick clamping body, the eccentric mechanism acting on an upper portion of each positioning pin by rotating the eccentric mechanism to a locked position, thereby moving each positioning pin downward to a position abutting against the working member, and each positioning pin being movable upward to a position releasing the working member by rotating the eccentric mechanism to an unlocked position.

Optionally, the eccentric mechanism is formed as a straddle structure including cam portions at both ends and a cam shank portion connecting the cam portions at both ends together,

optionally, the quick clamping device further includes a pin shaft and a torsion spring, the upper portion of each positioning pin is installed in a span space of the straddle structure, the pin shaft penetrates through a transverse hole formed in the upper portion of each positioning pin and transverse holes formed in cam portions at two ends, so that each positioning pin is pivotally connected with the eccentric mechanism, a main body of the torsion spring is sleeved on the outer peripheral portion of the pin shaft and located in the span space of the straddle structure, one end of the torsion spring abuts against the quick clamping body, and the other end of the torsion spring abuts against the cam handle portion, so that additional locking force is provided for the eccentric mechanism.

Alternatively, the eccentric mechanism is formed as a comb-like structure including at least three cam portions arranged at intervals and a shank portion connecting the cam portions together, each of the cam portions being formed in a cam shape, and the quick clamping device further includes a pin shaft, an upper portion of each of the positioning pins being fitted in a space between the corresponding cam portions, the pin shaft passing through a lateral hole opened in the upper portion of each of the positioning pins and a lateral hole opened in each of the cam portions, pivotally connecting each of the positioning pins with the eccentric mechanism.

Optionally, the first through hole is a stepped hole, the stepped hole is formed into a small diameter portion and a large diameter portion sequentially from top to bottom, a stepped portion is formed between the small diameter portion and the large diameter portion, each positioning pin is formed with a flange at a position near a lower end, and a pressure spring is sandwiched between the stepped portion and the flange.

Alternatively, a lower end of each positioning pin protrudes from the flange of the positioning pin, and in a case where the eccentric mechanism is rotated to the lock position, the lower end of each positioning pin protrudes into a corresponding positioning hole on the working member, and a lower surface of the flange of each positioning pin abuts against an upper surface of the working member.

Optionally, the plurality of first through holes are arranged in a front-rear direction.

Optionally, the quick clamp body comprises a quick clamp body main body and a cover plate connected to each other, the quick clamp body main body and the cover plate together forming the cavity.

Optionally, the cover plate is formed into a U-shaped plate, and includes a bottom plate for supporting the working member and two side plates corresponding to both sides of the quick clamping body main body in the width direction, each of the side plates being riveted with a corresponding one side of the quick clamping body main body by a rivet.

Optionally, a rear portion of the quick clamp body is configured to be removably connectable with the power head.

Optionally, a plurality of second through holes are further formed in the quick clamp body, and the quick clamp body and the power head are connected with each other through screws which penetrate through the second through holes and are screwed into the connecting holes formed in the power head.

The utility model also provides a working tool, working tool includes: the quick clamping device according to any one of the preceding aspects; the working member; and the power head is detachably connected with the rear part of the quick clamping body of the quick clamping device and is used for driving the operation component to move through the quick clamping device.

Optionally, the power head is a movable blade or a driving shaft capable of reciprocating, and the working component is a saw blade or a pruning blade.

Optionally, the number of power heads, quick-grip devices and work elements is two, and the work tool further comprises a drive mechanism for driving the two power heads back and forth relative to each other.

Alternatively, the working element of the work tool may be detachably connected to the power head by a connecting means other than the quick-grip device.

Alternatively, the attachment means may be a screw or a combination of a bolt and a nut.

The utility model discloses a press from both sides the device soon and have a plurality of locating pins to through the multiple spot location to the rear portion of operation part, accurately, firmly fix the operation part on pressing from both sides the device soon, this swing that has reduced the operation part when high-speed motion, and then improved the life-span of using the operation instrument who presss from both sides the device soon. In addition, the disassembly, assembly or replacement of the operation parts can be conveniently and rapidly realized, the mechanical stability is improved, and the functions of the operation tool are expanded.

Drawings

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is an exploded perspective view illustrating a quick clamping device according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a quick clamp body main body according to an embodiment of the present invention, viewed from obliquely below.

Fig. 3 is a perspective view illustrating a positioning pin according to an embodiment of the present invention.

Fig. 4 is a perspective view illustrating an eccentric mechanism according to an embodiment of the present invention.

Fig. 5 is a perspective view illustrating a cover plate according to an embodiment of the present invention.

Fig. 6A is a cross-sectional view showing the quick clamping device when the eccentric mechanism of the quick clamping device is rotated to the locked position according to an embodiment of the present invention; and figure 6B is a side view of the quick-clamping device at this point.

Fig. 7A is a cross-sectional view showing the quick clamping device when the eccentric mechanism of the quick clamping device is rotated to the unlocking position according to an embodiment of the present invention; and fig. 7B is a side view of the quick-clamping device at this time.

Fig. 8A is a perspective view illustrating a work tool including a quick-clamping device according to an embodiment of the present invention; and fig. 8B is an exploded perspective view showing the work tool in the vicinity of the quick clamping device.

Fig. 9A is a perspective view illustrating a work tool including a quick-clamping device according to another embodiment of the present invention; and fig. 9B shows an exploded perspective view.

Fig. 10 is a perspective view showing an eccentric mechanism according to a modification of the present invention.

Detailed Description

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same or similar elements or elements having the same effect are denoted by the same or similar reference numerals. Further, it is to be understood that the directions shown in the drawings and described throughout the present application are illustrative and not restrictive.

Quick clamping device

Fig. 1 is an exploded perspective view illustrating a quick-clamping device 200 according to the present invention, in which a working member 300 and a power head 100 connected to the quick-clamping device 200 are shown in dotted lines. A saw blade is shown in fig. 1 as an example of a work member 300, and a drive shaft of a work tool is shown as an example of the powerhead 100.

Here, as shown in the orthogonal coordinate system in fig. 1, the X direction in fig. 1 is defined as the front-rear direction (the positive direction of the X direction is front, and the negative direction is rear) or the longitudinal direction of the quick clamping device 200, the Z direction is defined as the up-down direction (the positive direction of the Z direction is up, and the negative direction is down) or the height direction of the quick clamping device 200, and the Y direction is defined as the left-right direction (the positive direction of the Y direction is left, and the negative direction is right) or the width direction of the quick clamping device 200.

As shown in fig. 1, the quick clamping device 200 includes a quick clamping body 210, two positioning pins 220 installed in the quick clamping body 210, and an eccentric mechanism 250 installed above the quick clamping body 210. Wherein the quick clamp body 210 includes a quick clamp body 210A and a cover plate 210B connected to each other by a rivet 270, the cover plate 210B being attached to a lower surface of the quick clamp body 210A from an underside of the quick clamp body 210A.

As shown in fig. 1 and 2, the quick clamping body main body 210A is formed in a substantially rectangular parallelepiped shape, and has a first groove 211a and a second groove 211b formed in the lower surface thereof, the first groove 211a and the second groove 211b being arranged in this order from the front to the rear. The depth and width of the first and second grooves 211a and 211b may be different depending on the height and width of the working member 300 and the driving head 100.

By mounting the cover plate 210B to the quick clamp body 210A, the cover plate 210B covers at least a part of the first groove 211a from below, so that the cover plate 210B forms, together with the quick clamp body 210A, a cavity 211 for accommodating the rear part 310 of the work member 300 (see fig. 7A), the cavity 211 is shaped to match the shape of the rear part 310 of the work member 300, and the cavity 211 is open at least at the front side of the quick clamp body 210 to receive the work member 300.

Preferably, as shown in fig. 2 and 7A, the first groove 211a is formed with a chamfer at the edge of the front side of the quick clamp body 210A that is open to facilitate the insertion and extraction of the working member 300.

A second slot 211b is open on the rear side of the quick clamp body 210A to receive the powerhead 100. The second recess 211b is shaped to match the shape of the powerhead 100.

As shown in fig. 1 and 5, the cover plate 210B is formed as a U-shaped plate-like member, and includes a bottom plate 215 for supporting the working member 300 and two side plates 216 corresponding to both sides of the quick clamping body main body 210A in the width direction. Two rivet holes 213 are formed in both sides of the quick clamping body main body 210A in the width direction, respectively, and two corresponding rivet holes 214 are formed in each side plate 216 of the cover plate 210B, respectively. The quick clamping body 210 is constructed by inserting two rivets 270 through the rivet holes 214 of the cover plate 210B and the rivet holes 213 of the quick clamping body 210A, respectively, to rivet the cover plate 210B and the quick clamping body 210A together.

The bottom plate 215 of the cover plate 210B is formed to have a length in the front-rear direction capable of covering at least a part of the first groove 211 a. The bottom plate 215 of the cover plate 210B may be formed to cover the entire first groove 211a, the entire first groove 211a and a part of the second groove 211B, or the entire first groove 211a and the entire second groove 211B, in the longitudinal direction, according to actual mounting requirements.

Referring to fig. 1 and 2, and fig. 6A and 7A, two first through holes 210h are opened on an upper surface 210s of the quick clamping body 210 in a region corresponding to the first groove 211a, the two first through holes 210h are arranged in the front-rear direction, and each first through hole 210h extends downward and communicates with the cavity 211 (the first groove 211 a). Specifically, referring to fig. 6A and 7A, each of the first through holes 210h is a stepped hole formed in the order of a small diameter portion 210ha and a large diameter portion 210hb from top to bottom, with a stepped portion 210hc formed between the small diameter portion 210ha and the large diameter portion 210 hb.

As mentioned above, the quick clamping device 200 further comprises two positioning pins 220. As shown in fig. 3, each alignment pin 220 includes a pin body 221. The pin body 221 is formed at an upper portion thereof with a lateral hole 222. Each of the positioning pins 220 is formed with a flange 223 at a position near a lower end (tip) 224. The lower end 224 of the locating pin 200 projects downwardly from the corresponding flange 223. The pin main body 221 has a diameter smaller than that of the small-diameter portion 210ha of the first through hole 210 h. The lower end 224 of the positioning pin 220 has a diameter smaller than that of a positioning hole 310h (to be described later) on the working member 300. The diameter of the flange 223 is larger than the diameter of the small diameter portion 210ha of the first through hole 210h and smaller than the diameter of the large diameter portion 210hb of the first through hole 210 h.

The manner in which the locating pin 220 is installed is described below. First, the compression spring 230 is fitted over the positioning pin 220, specifically, the compression spring 230 is fitted over the outer periphery of the pin main body 221, and one end rests on the upper surface of the flange 223. In a state where the cover plate 210B is detached from the quick clamp body 210A, two positioning pins 220 each of which has been fitted with the pressing spring 230 are inserted into the corresponding first through holes 210h from the lower side of the quick clamp body 210A, respectively, so that the lateral holes 222 of the upper portions of the positioning pins 220 are exposed from the upper surface 210s of the quick clamp body 210A, and the other ends of the pressing springs 230 abut on the stepped portion 210hc of the first through holes 210 h. That is, the pressing spring 230 is interposed between the stepped portion 210hc of the first through hole 210h and the flange 223 of the positioning pin 220.

As shown in fig. 1 and 4, the eccentric mechanism 250 is provided above the quick clamping body main body 210A (above the upper surface 210s), and the eccentric mechanism 250 is formed as a straddle structure including cam portions 252 at both ends and a cam shank portion 253 connecting the cam portions 252 at both ends together. The quick clamping device 200 further includes a pin shaft 260 and a torsion spring 240, an upper portion of each of the positioning pins 220 is installed in the span space (i.e., the space between the two cam portions 252), and the pin shaft 260 passes through the transverse hole 222 opened at the upper portion of each of the positioning pins 220 and the transverse holes 251 opened at the cam portions 252 at both ends, so that each of the positioning pins 220 is pivotally connected to the eccentric mechanism 250. The cam tang 253 may be imprinted with indicia 254 on its surface to indicate locking or unlocking.

As shown in fig. 1, the torsion spring 240 includes a main body (wound portion) and one end and the other end of an arm shape extending radially from the main body. The body of the torsion spring 240 fits over the pin 260 and is located in the span space of the straddle structure (preferably centered along the axial direction of the transverse bore 251). With the eccentric mechanism 250 installed, the one end of the torsion spring 240 abuts against the quick clamp body 210 and the other end abuts against the cam shank 253, thereby providing an additional locking force for the eccentric mechanism 250. Preferably, the one end of the torsion spring 240 is formed in a winding shape (e.g., a convex shape or a hook shape) and abuts on the upper surface of the quick clamp body 210, and the other end of the torsion spring 240 is also formed in a winding shape and is fitted in a groove 255 (see fig. 4) of the upper surface of the cam shank 253.

The locking and unlocking processes of the eccentric mechanism 250 are described below.

Referring to fig. 6A and 6B, as the cam shank 253 is rotated counterclockwise in the direction of arrow F1 toward the locking position shown in fig. 6B, the cam shank 253 carries the cam portion 252 to rotate counterclockwise, and as the radius of the portion of the cam in contact with the upper surface 210s of the quick clamp body main body 210A decreases, each positioning pin 220 moves downward, so that the lower end 224 of the positioning pin 220 is inserted into the corresponding positioning hole 310h on the work member 300 and the lower surface of the flange 223 of each positioning pin 220 abuts against the upper surface of the work member 300. In this way, the work member 300 can be sandwiched between the lower surface of the flange 223 of the positioning pin 220 and the upper surface of the cover plate 210B, thereby locking the work member 300 in the quick-clamping device 200. At the same time, the compression spring 230 applies a downward pressing force to the upper surface of the flange 223, and the torsion spring 240 provides a torsion force in the same direction as F1, so that the positioning pin 220 is stably held in the locking position.

In addition, referring to fig. 7A and 7B, as the cam shank 253 is rotated clockwise in the direction of arrow F2 toward the unlocking position shown in fig. 7B, the cam shank 253 rotates the cam portions 252 at both ends, and as the radius of the portion of the cam in contact with the upper surface 210s of the quick clamping body main body 210A increases, each positioning pin 220 is lifted upward by the eccentric mechanism 250 against the pressure of the compression spring 230 and the torque of the torsion spring 240, so that the lower end 224 of the positioning pin 220 positioned in each positioning hole 310h on the working member 300 is disengaged from the positioning hole 310h, at which time the working member 300 can be pulled out from the quick clamping body 210.

Referring to fig. 1, 2, and 6A and 7A, two second through holes 210H are opened in an area corresponding to the second groove 211b on the upper surface 210s of the quick clamping body 210, the two second through holes 210H are arranged in the front-rear direction, and each second through hole 210H extends downward and communicates with the second groove 211 b. The quick-clamp body 210 and the power head 100 are connected to each other by a screw 280 that passes through the second through-hole 210H and is screwed into a screw hole 110H provided on the power head 100. That is, the rear 290 (as shown in fig. 1) of the quick-clip body 210 of the quick-clip device 200 may have the powerhead 100 attached thereto.

As described above, with the quick clamping device 200 provided by the present invention, the eccentric mechanism 250 is matched with the plurality of positioning pins 220, so that the assembly, disassembly or replacement of the working component 300 can be conveniently and quickly realized; because the plurality of positioning pins 220 are used for multi-point positioning, the operation component 300 can be accurately and firmly installed, the swinging of the operation component during high-speed movement is avoided, and the service life of the operation tool is prolonged; by removably connecting the quick-clamp device 200 to the power head 100, the functionality of the quick-clamp device 200 and a work tool having the power head 100 (as will be exemplified below) is expanded; by designing the eccentric mechanism 250 to be a straddle structure, one eccentric mechanism 250 can operate a plurality of positioning pins 220 at the same time, improving the convenience of operation and ensuring the structural strength of the eccentric mechanism 250; the eccentric mechanism 250 is connected with the positioning pin 220 by adopting the pin shaft 260 penetrating through the cam part 252 and the positioning pin 220, so that the operation is more convenient and stable; by adopting the pressure spring 230 and the torsion spring 240, the position stability of the positioning pin 220 during operation is ensured, and the operation component 300 is prevented from falling off from the quick clamping device 200 due to the accidental lifting of the positioning pin 220; by inserting the lower end 224 of the positioning pin 220 into the positioning hole 310h corresponding to the work member 300, the work member 300 can be held more firmly than a positioning pin that clamps the work member 300 only by friction.

Work tool comprising quick clamping device

Fig. 8A-8B illustrate a work tool 10a including a quick-clamping device 200a according to one embodiment of the present disclosure.

The work tool 10a includes a body assembly 400a, a pair of movable blades 100a1, 100a2, a quick-clamping device 200a, and a saw blade 300 a. The movable blades 100a1, 100a2 are driven by a power device (not shown) in the machine body assembly 400a to reciprocate back and forth in an interlaced manner. The movable blades 100a1, 100a2 may be pruning blades of pruning shears, so that the structure composed of the movable blades 100a1, 100a2 and the body assembly 400a may be similar to that of ordinary pruning shears. However, unlike the ordinary pruning shears, one of the movable blades 100a1 is slightly longer than the other movable blade 100a2, and the front end of the movable blade 100a1 is provided with two connecting holes 110h, in other words, the longer movable blade 100a1 provided with the connecting hole 110h is taken as an example of the power head according to the present invention. The moving blade 100a1 is attached to the quick clamping device 200 by a screw 280.

When it is necessary to perform a sawing operation, the trimming shears can be provided with a sawing function by simply mounting a saw blade (an example of a working member) 300a to the quick clamping device 200 by operating an eccentric mechanism 250 (an eccentric handle) (see fig. 8A). When the sawing is not required to be performed, the eccentric handle is operated to remove the saw blade 300 a. Therefore, the characteristics of simple structure, portability and high cutting efficiency of the common pruning shears are fully exerted, and short plates which can not be used as forces of the common pruning shears for thicker branches are supplemented.

Fig. 9A to 9B illustrate a work tool 10B including a quick-clamping device 200B according to another embodiment of the present invention.

The work tool 10b includes a body assembly 400b, a quick-clamping device 200b, and a work member 300 b. Wherein the body assembly 400b has two power heads 100b, and the two power heads 100b are driven by a power unit (not shown) in the body assembly 400b to reciprocate back and forth in an alternating manner. A quick-clamping device 200b is connected to each of the two power heads 100 b. During operation, by operating the eccentric mechanisms 250 (eccentric handles) of the two quick clamping devices 200b, required operation parts can be installed or replaced on the two quick clamping devices 200b, so that different operation functions are realized; when the operation is not performed, all the operation components can be detached and stored independently. The work tool 10b has the advantages of a compact machine and a variety of options for the form of work parts.

Specifically, the above-mentioned working member 300B may be a saw blade, a pruning blade, or a multifunctional saw blade 300B as shown in fig. 9A and 9B, which have different specifications. The blade part on one side of the multifunctional saw blade 300b is a sawtooth, so that the saw cutting function can be realized; the blade part on the other side is provided with scissors teeth, so that the functions of pruning and trimming can be realized. One work member 300b is connected to each quick-clamping device 200b, but the work member 300b may be attached to only one of the quick-clamping devices 200b, and the other quick-clamping device 200b is unloaded. In addition, the front end of the working member 300b may be opened with a connection hole, so that the working member 300b may be used as a power head to connect a further quick-clamping device and a further working member.

Modification examples

Although the preferred embodiments of the present invention have been described in detail hereinabove, the present invention is not limited thereto, and those skilled in the art can make various modifications and variations to the embodiments within the scope of the present invention.

For example, although in the above-described embodiment shown in fig. 1, the cover plate 210B is formed as a U-shaped plate and is connected to the quick clamping body main body 210A through the two side plates 216, the present invention is not limited thereto, and the cover plate and the quick clamping body main body may be connected in other manners. For example, as shown in fig. 8B, lugs having holes (e.g., screw holes) may be formed at both left and right sides of the quick clamp body, and in this case, the cover plate may be formed in a flat plate shape and have holes corresponding to the holes of the lugs, so that the cover plate may be fixed to the lugs of the quick clamp body by bolts or screws. Further, the cover plate 210B may be formed integrally with the quick clamp body 210A, i.e., the quick clamp body 210 is formed integrally, as long as the quick clamp body 210 has a cavity 211 formed therein that is open at least at the front side of the quick clamp body 210 to receive the working member 300.

Although in the above-described embodiment, the lower surface of the quick clamp body main body 210A is opened with the second groove 211b, the shape of the second groove 211b matches the shape of the power head 100, and the quick clamp body 210 and the power head 100 are connected by the screw 238 that passes through the second through hole 210H and the connection hole 110H on the power head 100. However, other means of connection of the quick-clip body 210 to the powerhead 100 are possible. For example, the powerhead may be inserted into a slot formed on the rear side of the quick clamp body. The connection between the power head and the quick clamp body main body can be realized through buckling, screwing, locking and the like. In addition, the power head and the quick clamp body main body can be directly bonded, welded or formed into an integral piece.

Although in the above embodiment, the quick-clamping device 200 is connected to the power head 100, and the power head can reciprocate back and forth, the present invention is not limited thereto, and the power head can rotate, swing, or the like; and the quick clamping device can also be applied to manual devices or static devices, such as manual pruning shears, manual saws and the like.

Although the above embodiment employs the double safety of the compression spring 230 and the torsion spring 240, one of the compression spring 230 and the torsion spring 240 may be used as long as the elastic force or the torque is sufficiently large. An additional locking mechanism may also be utilized to lock the over-center mechanism in the locked position.

Although in the above-described embodiment, the eccentric mechanism 250 is formed in a straddle structure, the eccentric mechanism may be formed in any other suitable shape. For example, the eccentric mechanism may be formed as a comb-like structure or the like having more than two cam portions. Fig. 10 shows an eccentric mechanism 250a having a comb-like structure according to a modification, which eccentric mechanism includes that the eccentric mechanism 250a includes at least three cam portions (comb-tooth portions) 252a with lateral holes 251 a. In this case, an upper portion of each of the positioning pins 220 is installed in a space between the corresponding cam portions 252a, and a pin shaft 260 passes through a transverse hole 222 opened at the upper portion of each of the positioning pins and a transverse hole 251a on each of the cam portions 252a to pivotally connect each of the positioning pins with the eccentric mechanism.

Although the positioning pin 220 is pivotally connected to the eccentric mechanism 250 using the pin shaft 260 in the above-described embodiment, the positioning pin and the eccentric mechanism may not be connected to each other. For example, an eccentric mechanism may be pivotally connected to a shaft having a fixed positional relationship with the quick clamping body, and when the eccentric mechanism is rotated to different positions, its cam surface presses the detent pin down to different depths, in which case the compression spring may be changed to a tension spring to assist the upward lifting of the detent pin at the unlocked position.

Although in the above embodiment, the quick clamping device 200 has two positioning pins 220 and two corresponding first through holes 210h and two corresponding compression springs 230, the present invention is not limited thereto, and the number of the positioning pins 220 may be an appropriate number greater than two, and in this case, the number of the first through holes, the compression springs, the torsion springs, and the cam portions (or the comb teeth portions) may be varied. Further, although in the above-described embodiment, the two positioning pins 220 are arranged in the front-rear direction (longitudinal direction), the present invention is not limited thereto, and a plurality of positioning pins may be arranged in the front-rear direction, in the left-right direction, or in a plurality of rows (a plurality of eccentric mechanisms may be provided).

Although in the above-described embodiment, the positioning hole 310h on the working member 300 is formed as a through hole, the positioning hole 310h may be formed as a blind hole.

Although in the above-described embodiment, the work member 300 is positioned by inserting the lower end 224 of the positioning pin 220 into the corresponding positioning hole 310h on the work member 300 and abutting the lower surface of the flange 223 of each positioning pin 220 against the upper surface of the work member 300, the positioning pin may be engaged with the cover plate, positioning and fixing the work member only by friction, in which case the positioning hole may not be provided on the work member.

Although in the above-described embodiment, the positioning pin and the eccentric mechanism are used only for fixing and releasing the working member, the present invention is not limited thereto, and the power head may be fixed by the eccentric mechanism and the positioning pin. In this case, for example, two eccentric mechanisms and two sets of positioning pins may be provided front and rear to fix the working member and the power head, respectively; it is also possible to use only one eccentric mechanism to actuate both the positioning pin for fixing the working member and the positioning pin for fixing the power head; the power head and the operation component can be overlapped, and each positioning pin passes through a positioning hole on the operation component and a connecting hole on the power head through the eccentric mechanism so as to connect the operation component and the power head together.

Although in the above described embodiments the work member is mounted and dismounted by the quick clamping device according to the invention, it is also possible to realize a detachable connection between the work member and the power head by a connecting device other than this quick clamping device. For example, based on the embodiment shown in fig. 8A, the rear portion of the working member (saw blade) 300a and the front portion of the power head (movable blade) 100a1 may be stacked, the two positioning holes of the working member 300a and the two coupling holes 110h of the power head 100a1 may be designed to correspond to each other, a bolt and a corresponding nut capable of being inserted through the positioning holes and the coupling holes at the same time may be used as a coupling means, and the working member 300a may be coupled to the power head 100a 1.

In addition, the positioning pin and/or the part of the cover plate contacting with the working component can be made of elastic materials or attached with elastic components (such as a gasket) so as to eliminate manufacturing errors and reduce vibration.

Features shown in the embodiments, particularly in different embodiments, may be combined or substituted without departing from the scope of the invention.

Claims (10)

1. A quick clamping device (200) for mounting and dismounting a work part (300), characterized in that the quick clamping device (200) comprises:

a quick clamping body (210) which is provided with a cavity (211) for accommodating the rear part (310) of the working component (300), wherein the cavity (211) is opened at the front side of the quick clamping body (210) to receive the working component (300), and a plurality of first through holes (210h) are opened on the upper surface (210s) of the quick clamping body (210), and each first through hole (210h) extends downwards and is communicated with the cavity (211);

a plurality of positioning pins (220), the number of the plurality of positioning pins (220) being equal to the number of the plurality of first through holes (210h), and the plurality of positioning pins (220) being respectively arranged in the corresponding first through holes (210 h);

an eccentric mechanism (250) provided above the quick clamp body (210), the eccentric mechanism (250) acting on an upper portion of each positioning pin (220) by rotating the eccentric mechanism (250) to a locked position, thereby moving each positioning pin (220) downward to a position abutting against the working member (300), and each positioning pin (220) being movable upward to a position releasing the working member (300) by rotating the eccentric mechanism (250) to an unlocked position.

2. The quick clamping device (200) according to claim 1, wherein the eccentric mechanism (250) is formed as a straddle structure comprising two end cam portions (252) and a cam shank portion (253) connecting the two end cam portions (252) together.

3. The quick clamping device (200) according to claim 2, wherein the quick clamping device (200) further comprises a pin (260) and a torsion spring (240), an upper portion of each positioning pin (220) is installed in the span space of the straddle structure, the pin (260) passes through a transverse hole (222) formed in the upper portion of each positioning pin (220) and a transverse hole (251) formed in the cam portions (252) at both ends, each positioning pin (220) is pivotally connected with the eccentric mechanism (250), a main body of the torsion spring (240) is sleeved on the outer circumferential portion of the pin (260) and is located in the span space of the straddle structure, one end of the torsion spring (240) abuts against the quick clamping body (210) and the other end abuts against the cam shank portion (253) so as to provide an additional locking force for the eccentric mechanism (250).

4. The quick clamping device (200) according to any one of claims 1 to 3, wherein the first through hole (210h) is a stepped hole formed in a small diameter portion (210hs) and a large diameter portion (210hb) in this order from top to bottom, a stepped portion (210ht) is formed between the small diameter portion (210hs) and the large diameter portion (210hb), each positioning pin (220) is formed with a flange (223) at a position near a lower end (224), and a compression spring (230) is interposed between the stepped portion (210ht) and the flange (223).

5. The quick clamping device (200) according to claim 4, characterized in that the lower end (224) of each positioning pin (200) protrudes beyond the flange (223) of the positioning pin (200), and in the case of a rotation of the eccentric mechanism (250) to the locking position, the lower end (224) of each positioning pin (220) protrudes into a corresponding positioning hole (310h) on the work member (300), and the lower surface of the flange (223) of each positioning pin (200) abuts against the upper surface of the work member (300).

6. Quick clamping device (200) according to any of claims 1 to 3, characterized in that the quick clamping device (200) has at least one of the following features a to c:

a: the plurality of first through holes (210h) are arranged in a front-rear direction;

b: the quick clamp body (210) comprises a quick clamp body main body (210A) and a cover plate (210B) which are connected with each other, and the quick clamp body main body (210A) and the cover plate (210B) jointly form the cavity (211);

c: a rear portion (290) of the quick-clip body (210) is configured to be removably connectable with a powerhead (100);

d: the quick clamp body (210) is also provided with a plurality of second through holes (210H), and the quick clamp body (210) and the power head (100) are connected with each other through screws (280) which penetrate through the second through holes (210H) and are screwed into connecting holes (110H) arranged on the power head (100).

7. The quick clamping device (200) according to any one of claims 1 to 3, characterized in that the quick clamping body (210) comprises a quick clamping body (210A) and a cover plate (210B) connected to each other, the quick clamping body (210A) and the cover plate (210B) together forming the cavity (211),

wherein the cover plate (210B) is formed into a U-shaped plate-like member and includes a bottom plate (215) for supporting the working member (300) and two side plates (216) corresponding to both sides of the quick clamping body main body (210A) in the width direction, each side plate (216) being riveted to a corresponding side of the quick clamping body main body (210A) by a rivet (270).

8. A work tool (10), characterized in that the work tool (10) comprises:

quick clamping device (200) according to any of claims 1 to 7;

the work member (300); and

the power head (100), wherein the power head (100) is detachably connected with the rear part (290) of the quick clamping body (210) of the quick clamping device (200), and the power head (100) is used for driving the operation component (300) to move through the quick clamping device (200).

9. The work tool (10) of claim 8, wherein the power head (100) is a movable blade or a drive shaft (100b) that is capable of reciprocating, and the work element (300) is a saw blade or a pruning blade.

10. The work tool (10) according to claim 8 or 9,

the number of the power heads (100), the quick clamping device (200) and the working component (300) is two, and the working tool (10) further comprises a driving mechanism for driving the two power heads (100) to reciprocate back and forth relative to each other.

Images