CN218556996U - Impact tool - Google Patents

Abstract

An impact tool comprises a main body, a handle connected with the main body and a vibration damping component positioned between the main body and the handle; the one end pivotal connection of handle passes through damping subassembly in the rear end face of main part in main part and the other end, and damping subassembly is including the first damping portion that is located between the rear end face of main part and the handle, and damping subassembly is still including the second damping portion that is located between main part and the first damping portion, and when vibration is too big, first damping portion support by in on the second damping portion to carry out dual damping, greatly reduced from the vibration that the main part transmitted the handle.

Description

Impact tool

[ technical field ]

The utility model relates to an electric tool field, in particular to impact tool of hammer pick class.

[ background art ]

Impact tools such as electric hammers, which generate reverse impact during operation and easily cause hand numbness and other dangers of operators, are often provided with a vibration damping mechanism between a handle and a machine body. For example, a vibration-proof electric hammer is disclosed in chinese utility model publication No. CN2686813Y, which comprises an electric hammer main body, a handle disposed at the rear end of the electric hammer main body, and a spring seat connected between the electric hammer main body and the handle, wherein one spring seat comprises two guide rods, the two guide rods are parallel to each other and disposed on the same horizontal plane, the direction of the two guide rods is along the vibration direction of the electric hammer, and each guide rod is sleeved with a compression spring; the two ends of the two guide rods are respectively connected to the main body and the handle through other structures, the compression spring weakens the vibration of the main body and then transmits the vibration to the handle, and the vibration is still transmitted to the handle in a vibration reduction mode.

Therefore, there is a need for a new impact tool designed to further attenuate the vibrations transmitted from the body to the handle.

[ contents of utility model ]

To the deficiency of the prior art, the utility model aims to provide an impact tool who carries out dual damping to the handle, the damping effect is showing.

The utility model provides a technical scheme that prior art problem adopted is: an impact tool comprising a body, a handle connected to the body, and a vibration dampening assembly located between the body and the handle; one end of the handle is pivotally connected to the main body, the other end of the handle is connected to the rear end face of the main body through the vibration damping assembly, the vibration damping assembly comprises a first vibration damping portion located between the rear end face of the main body and the handle, the first vibration damping portion comprises a pair of bolts extending into the handle from the rear end face of the main body, a connecting plate fixed in the handle and a first spring sleeved on the bolts, the connecting plate is sleeved on the bolts in a sliding mode, and two ends of the first spring abut against the rear end face of the main body and the connecting plate respectively; the damping assembly further comprises a second damping portion located between the main body and the first damping portion, the second damping portion comprises a pair of short bolts extending backwards from the rear end face of the main body, a pressing plate sleeved on the short bolts in a sliding mode, and a second spring sleeved on the short bolts, the pressing plate is located between the rear end face of the main body and the connecting plate, and two ends of the second spring are respectively abutted to the rear end face of the main body and the pressing plate.

The further improvement scheme is as follows: the second vibration reduction part and the first vibration reduction part are arranged perpendicular to each other, and a connection plane of the pair of short bolts is perpendicular to a connection plane of the pair of bolts.

The further improvement scheme is as follows: the main part is equipped with the upper end that is located the rear end face and towards the protruding two couples of screw thread seat that stretch of handle, wherein a pair of the line of screw thread seat intersects and mutually perpendicular with the line of another pair of the screw thread seat, two couples of the screw thread seat respectively with short bolt, bolt fixed connection.

The further improvement scheme is as follows: the handle has left handle and right handle that each other lid closed the installation, left handle and right handle all have the confession half moon groove that the connecting plate was pegged graft, left handle and right handle lid close the installation back two half moon groove forms jointly and is used for the card to hold the draw-in groove of connecting plate.

The further improvement scheme is as follows: the main part is equipped with from rear end below orientation the connecting arm that the handle extends, the connecting arm is equipped with transversely runs through the perforating hole of connecting arm, left side handle has and extends and wear to locate towards right side handle the pivot pin of perforating hole, right side handle is equipped with at least the part and accepts the holding tank of pivot pin.

The further improvement scheme is as follows: the first vibration reduction part comprises a first damping element which is sleeved on the bolt in a sliding mode, and the first damping element is located between the head of the bolt and the connecting plate.

The further improvement scheme is as follows: the first damping element is a rubber washer.

The further improvement scheme is as follows: the first vibration reduction part further comprises a second damping element and a baffle which are sequentially sleeved on the bolt in a sliding mode, one end of the first spring abuts against the baffle, and the second damping element abuts against the rear end face of the main body through the baffle.

The further improvement scheme is as follows: the second vibration reduction part further comprises a third damping element which is sleeved on the short bolt in a sliding mode, the third damping element is located between the head of the short bolt and the abutting plate, and the second spring abuts against the third damping element on the head of the short bolt through the abutting plate.

The further improvement scheme is as follows: the third damping element is a rubber washer.

Compared with the prior art, the utility model discloses following beneficial effect has: damping subassembly includes first damping portion and second damping portion, and first damping portion weakens the vibration that the main part transmitted the handle through first spring tentatively, and when the vibration was too big, the connecting plate in the first damping portion moved forward and promoted the clamp plate that supports of second damping portion moves forward, support the clamp plate and compress the second spring forward in order to carry out the damping once more, through the mode of second grade damping, great weakening the vibration that the main part transmitted the handle. In addition, the first damping element and the third damping element which are respectively arranged in the first vibration damping part and the second vibration damping part are rubber gaskets, so that the vibration transmitted to the handle by the main body is further weakened.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings:

FIG. 1 is a front view of an impact tool in accordance with a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the impact tool shown in FIG. 1;

FIG. 3 is a partial perspective view of the impact tool shown in FIG. 1;

FIG. 4 is an exploded perspective view of FIG. 1;

FIG. 5 is a perspective view of the cylinder and clutch collar of the present embodiment;

FIG. 6 is a perspective view of the clutch sleeve of FIG. 5;

fig. 7 is an enlarged sectional view taken along the direction a shown in fig. 5.

[ detailed description of the invention ]

Fig. 1 to 7 show an impact tool 100 according to the present invention, which is an electric hammer used for punching holes in decoration and building. The output direction of the impact tool 100 is defined as the front end, the electric hammer comprises a main body 1, a handle 2 connected to the main body 1 and a damping component 3 positioned between the main body and the handle 2, the main body 1 comprises a machine shell 5, a function knob 6 arranged on the machine shell 5, a chisel head arranged at the front end of the machine shell 5, a motor 4 accommodated in the machine shell 5, and an impact system 10 and a rotating system 20 driven by the motor 4, when the impact tool 100 works, the function knob 6 is adjusted to interrupt or lock the rotating output of the rotating system 20, and then the impact system 10 and the rotating system 20 jointly drive the chisel head to perform impact output or impact rotating output.

Referring to fig. 2 and fig. 5 to 7, the motor 4 is supported in the housing 5 along a direction perpendicular to the output direction of the impact tool 100 and has a motor tooth 41 extending upward, the main body 1 further includes a rotation input tooth 55 engaged with the front of the motor tooth 41, a rotation output shaft 54 fixed to the inner ring of the rotation input tooth 55, an impact tooth 56 engaged with the rear of the motor tooth 41, and an eccentric shaft 57 fixed to the inner ring of the impact tooth 56, the upper end of the rotation output shaft 54 is engaged with the rotation system 20, and the upper end of the eccentric shaft 57 is provided with an eccentric pin connected to the impact system 10.

The rotating system 20 includes a locking ring 25 connected to the inner wall of the casing 5 through a keyway, a retainer 26 clamped to the inner wall of the casing 5, a locking spring 27 for pressing the locking ring 25 against the retainer 26, the cylinder 21, a return spring 22 sleeved on the cylinder 21, a clutch sleeve 23, an output gear 24, and a support bearing (not numbered) sleeved on the front end of the cylinder 21. The cylinder 21 is supported in the housing 5 in the front-rear direction, the output gear 24 is axially fixed to the rear end of the cylinder 21 and is rotatable with respect to the cylinder 21, the output gear 24 has a transmission tooth projecting toward the front along the cylinder 21 and meshing with the rotary output shaft 54; a gap is formed between the transmission gear and the cylinder 21, and the rear end of the clutch sleeve 23 is provided with a gear shaping inserted into the gap and in meshed connection with the output gear 24, so that the space is saved, and the miniaturization of the impact tool is facilitated; the periphery of the front end of the clutch sleeve 23 is provided with a latch which is clamped with the locking ring 25; the inner ring of the clutch sleeve 23 is clamped on the periphery of the cylinder 21 through a key groove and rotates together; the return spring 22 presses the clutch sleeve 23 backwards to be meshed with the output gear 24, and the output gear 24 drives the clutch sleeve 23 to rotate together.

The impact system 10 comprises a piston 11 arranged at the rear end in the cylinder 21 in a sliding manner and a hammer 12 positioned in front of the piston 11, wherein the piston 11 and the hammer 12 are arranged at intervals and together with the cylinder 21, a cavity is defined, the cylinder 21 is provided with a ventilation hole 211 penetrating from the periphery to the cavity, the piston 11 drives the hammer 12 to reciprocate, and the ventilation hole 211 is at least partially blocked by the stroke of the hammer 12; the cylinder 21 has six ribs forming a keyway, the transfer port 211 extends through one of the ribs, and the transfer port 211 has a first diameter at the outer periphery of the cylinder 21 and a second diameter at the inner periphery of the cylinder 21, the first diameter being greater than the second diameter to facilitate the entry of outside air into the cavity.

The clutch sleeve 23 is provided with six grooves clamped with six convex ribs, the inner ring of the clutch sleeve 23 covers the ventilating holes 211, the clutch sleeve 23 is provided with a plurality of ventilating holes 231 which are distributed at intervals along the axis and penetrate from the outer periphery to the inner periphery, in the embodiment, three ventilating holes 231 are arranged at intervals, and further the ventilating holes 231 are positioned in front of the gear shaping and penetrate through the grooves, namely, three ventilating holes 231 are arranged at intervals in the single groove; after the clutch sleeve 23 is positioned, one of the plurality of air holes 231 is communicated with the air vent 211 relatively to prevent the air vent 211 from being blocked. In a cross section perpendicular to the axis of the cylinder 21 and passing through the ventilation holes 211, six ventilation holes 231 are uniformly distributed in six grooves of the clutch sleeve 23, that is, eighteen ventilation holes 231 are cumulatively arranged on the clutch sleeve 23 in three cross sections corresponding to the three ventilation holes 231 arranged at intervals, and three ventilation holes 231 arranged at intervals are arranged in each groove of the clutch sleeve 23, so that the grooves without ventilation holes 231 can be prevented from covering the ventilation holes 231, and alignment is not required during installation.

The function knob 6 extends into the shell 5 to extend and drives the clutch sleeve 23 to move and position along the axial direction of the cylinder 21, the latch protrudes outwards and forms a step part, and the function knob 6 is pressed against the step part and can push the clutch sleeve 23 to move forwards; the function knob 6 can drive the clutch sleeve 23 to move to and be positioned at three positions in which the ventilation holes 211 correspond to different ventilation holes 231 in turn, so that the impact tool 100 has three modes, i.e., an impact mode, an impact rotation mode, and an impact rotation locking mode.

In the impact rotation mode, the gear shaping of the clutch sleeve 23 is engaged with the output gear 24, the clutch sleeve 23 drives the cylinder 21 to rotate together, the cylinder 21 drives the chisel head to rotate and output, and the impact system 10 simultaneously drives the chisel head to impact.

In the impact mode, the function knob 6 drives the clutch sleeve 23 to move forwards, the clutch sleeve 23 is in meshed connection with the output gear 24 to be interrupted, the chisel head is driven to impact and output only by the impact system 10, and the chisel head can rotate freely.

In the impact rotation locking mode, the function knob 6 continues to drive the clutch sleeve 23 to move forwards, the clutch sleeve 23 is meshed with the output gear 24 and is disconnected, the latch in front of the clutch sleeve 23 is clamped with the locking ring 25, the clutch sleeve 23 cannot rotate, at the moment, the chisel head is driven by the impact system 10 to impact and output, and the air cylinder 21 and the chisel head cannot rotate freely.

The air holes opposite to the ventilating holes 211 of the air cylinder 21 are formed in the clutch sleeve 23 in the embodiment, and the inner ring of the clutch sleeve 23 is prevented from being grooved in a punching mode so that the ventilating holes 211 can be ventilated, so that the strength of the clutch sleeve 23 is improved, the thickness of the clutch sleeve 23 can be reduced, the service life of the impact tool 100 is prolonged, and the weight of the whole machine is reduced. In addition, six air holes 231 are respectively arranged in three sections, perpendicular to the axial direction, of the clutch sleeve 23, eighteen air holes 231 are uniformly distributed in an accumulated mode, so that when the clutch sleeve 23 is installed, the air holes 231 do not need to be aligned with the air holes 211, installation is convenient and fast, and the phenomenon of installation dislocation is avoided.

Referring to fig. 1, 3 and 4, one end of the handle 2 is pivotally connected to the main body 1, and the other end is connected to the rear end surface of the main body 1 through the damping assembly 3. The main body 1 is provided with a connecting arm 53 extending from the lower part of the rear end toward the handle 2, the connecting arm 53 is provided with a through hole 531 transversely penetrating through the connecting arm 53, the handle 2 is provided with a left handle 51 and a right handle 52 which are mutually covered and installed, the left handle 51 is provided with a pivot pin (not shown) extending toward the right handle 52 and penetrating through the through hole 531, and the right handle 52 is provided with a holding groove 521 at least partially accommodating the pivot pin.

The vibration damping assembly 3 comprises a first vibration damping part 31 positioned between the rear end surface of the main body and the handle 2 and a second vibration damping part 32 positioned between the main body 1 and the first vibration damping part 31, wherein the first vibration damping part 31 and the second vibration damping part 32 are arranged perpendicular to each other.

The first vibration damping portion 31 includes a pair of bolts 311 extending into the handle 2 from the rear end surface of the main body 1, a connecting plate 312 fixed in the handle, and a first spring 313, a first damping element 314, a second damping element 315, and a baffle 316 slidably fitted over the bolts 311. The main body 1 is provided with a pair of threaded seats which are located at the upper end of the rear end face and protrude towards the handle 2, and the threaded seats are fixedly connected with the bolt 311. The left end of the first spring 313 presses against the baffle, and the second damping element 315 presses against the rear end surface of the main body 1 through the baffle 316, that is, the left end of the first spring 313 indirectly presses against the rear end surface of the main body 1. The first damping element 314 is located between the head of the bolt 311 and the connecting plate 312, and the right side of the first spring 313 presses the connecting plate 312 and presses the connecting plate 312 against the head of the bolt 311. The left handle 51 and the right handle 52 are both provided with a half-moon groove for the connection plate 312 to be inserted, and the half-moon grooves form a clamping groove 522 for clamping the connection plate 312 together after the left handle 51 and the right handle 52 are covered and installed. In this embodiment, the first spring 313 is used for damping the vibration transmitted from the main body to the handle 2, and the first damping element 314 and the second damping element 315 are both rubber gaskets, so as to further damp the vibration transmitted from the main body 1 to the handle 2.

The second vibration damping portion 32 includes a pair of short bolts 321 extending backward from the rear end surface of the main body 1, a pressing plate 322 slidably sleeved on the short bolts 321, a third damping element 324, and a second spring 323. The main body 1 is provided with another pair of thread seats which are positioned at the upper end of the rear end face and protrude towards the handle 2, and the other pair of thread seats is fixedly connected with the short bolt 321. The pressing plate 322 is located between the rear end surface of the main body 1 and the connecting plate 312, the third damping element 324 is located between the head of the short bolt 321 and the pressing plate 322, the left end of the second spring 323 abuts against the rear end surface of the main body, and the other end of the second spring 323 abuts against the third damping element 324 against the head of the short bolt 321 through the pressing plate 322. The connection plane of the short bolt 321 in this embodiment is perpendicular to the connection plane of the pair of bolts 311, and the connection line of one pair of the screw bases intersects with the connection line of the other pair of the screw bases and is perpendicular to each other, so that the second vibration reduction part 32 is more compactly arranged inside the impact tool 100.

The vibration damping assembly 3 in this embodiment includes a first vibration damping portion 32 and a second vibration damping portion 32, the first vibration damping portion 32 primarily dampens the vibration transmitted from the main body 1 to the handle 2 through a first spring 313, when the vibration is too large, the connecting plate 312 on the first vibration damping portion 32 moves forward and pushes the pressing plate 322 of the second vibration damping portion 32 to move forward, the pressing plate 322 compresses the second spring 323 forward to damp the vibration again, and the vibration transmitted from the main body 1 to the handle 2 is greatly damped through a secondary vibration damping mode. In addition, the first damping element 314, the second damping element 315 and the third damping element 324 which are respectively arranged in the first vibration damping part 32 and the second vibration damping part 32 are all rubber gaskets, so that the vibration transmitted from the main body 1 to the handle 2 is further weakened.

Claims (10)

1. An impact tool comprising a body, a handle connected to the body, and a vibration dampening assembly located between the body and the handle; one end of the handle is pivotally connected to the main body, the other end of the handle is connected to the rear end face of the main body through the vibration damping assembly, the vibration damping assembly comprises a first vibration damping portion located between the rear end face of the main body and the handle, the first vibration damping portion comprises a pair of bolts extending into the handle from the rear end face of the main body, a connecting plate fixed in the handle and a first spring sleeved on the bolts, the connecting plate is slidably sleeved on the bolts, and two ends of the first spring abut against the rear end face of the main body and the connecting plate respectively; the method is characterized in that: the damping assembly further comprises a second damping portion located between the main body and the first damping portion, the second damping portion comprises a pair of short bolts extending backwards from the rear end face of the main body, a pressing plate sleeved on the short bolts in a sliding mode, and a second spring sleeved on the short bolts, the pressing plate is located between the rear end face of the main body and the connecting plate, and two ends of the second spring are respectively abutted to the rear end face of the main body and the pressing plate.

2. The impact tool of claim 1, wherein: the second vibration reduction part and the first vibration reduction part are arranged perpendicular to each other, and a connection plane of the pair of short bolts is perpendicular to a connection plane of the pair of bolts.

3. The impact tool of claim 2, wherein: the main body is provided with two pairs of threaded seats which are positioned at the upper end of the rear end face and protrude towards the handle, the connecting line of one pair of threaded seats is intersected with the connecting line of the other pair of threaded seats and is mutually vertical, and the two pairs of threaded seats are respectively fixedly connected with the short bolt and the bolt.

4. The impact tool of claim 1, wherein: the handle has left handle and right handle that each other lid closed the installation, left handle and right handle all have the confession half moon groove that the connecting plate was pegged graft, left handle and right handle lid close the installation back two half moon groove forms jointly and is used for the card to hold the draw-in groove of connecting plate.

5. The impact tool of claim 4, wherein: the main part is equipped with from rear end below orientation the connecting arm that the handle extends, the connecting arm is equipped with transversely runs through the perforating hole of connecting arm, left side handle has and extends and wear to locate towards right side handle the pivot pin of perforating hole, right side handle is equipped with at least the part and accepts the holding tank of pivot pin.

6. The impact tool of claim 1, wherein: the first vibration reduction portion comprises a first damping element which is sleeved on the bolt in a sliding mode, and the first damping element is located between the head portion of the bolt and the connecting plate.

7. The impact tool of claim 6, wherein: the first damping element is a rubber washer.

8. The impact tool of claim 6, wherein: the first vibration reduction part further comprises a second damping element and a baffle which are sequentially sleeved on the bolt in a sliding mode, one end of the first spring abuts against the baffle, and the second damping element abuts against the rear end face of the main body through the baffle.

9. The impact tool of claim 1, wherein: the second vibration reduction part further comprises a third damping element which is sleeved on the short bolt in a sliding mode, the third damping element is located between the head of the short bolt and the abutting plate, and the second spring abuts and presses the third damping element against the head of the short bolt through the abutting plate.

10. The impact tool of claim 9, wherein: the third damping element is a rubber washer.

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