TWI453098B - An impact tool with vibration dampening device - Google Patents

Description

Electric hammer with damping device

The present invention relates to an electric hammer, and more particularly to an electric hammer having a damper device.

A general electric hammer generally has an L-shaped body, a hammer rod and a driving group respectively disposed on the body, and a grip mounted on the rear of the body. During use, the hammer will reciprocally hammer the object to be struck to generate a corresponding reaction force, so that when the operator holds the grip to perform the operation, the vibration is often subjected to a large amount of vibration, and once the application time is extended, It is easy to cause joint damage to the hands, so many grips of the electric hammer are used.

For example, the electric hammer damper disclosed in U.S. Patent No. 6,148,930 has an L-shaped body, a hammer rod and a driving group respectively disposed on the body, and a hollow U-shaped grip opening toward the body. a pair of damper units fixed in parallel between the body and the grip, each damper unit having a connecting straight rod, and a compression spring that is biased between the connecting straight rod and the grip, The shock absorbing unit can absorb the vibration generated by the grip during the operation. However, during the application process, the two groups of shock absorbing units are subjected to an uneven amount of force, and the damper unit located above and adjacent to the hammer rod is subjected to a large force, and is located below and away from the hammer rod. The force of the unit is small, so the shock absorbing unit below is prone to yaw, which reduces the shock absorption effect or causes the operation to be unsmooth.

The electric hammer damper device disclosed in U.S. Patent No. 6,962,211, which is directed to the problem of unevenness of the grip caused by yaw vibration, has a casing and a hammer respectively mounted in the casing. A rod set, a drive set and a damping device. The damper device has a compression spring that elastically abuts between the hammer set and the casing along the length of the hammer set, and two cantilever springs respectively disposed on the hammer set and the drive group, the cantilever springs Located on opposite sides of the hammer set. Although the cantilever springs can absorb the yaw vibration during the application process, the suspension design not only increases the overall volume of the housing, but also because the compression spring and the cantilever springs will fully withstand the force of application. And the reaction force, on the contrary, will reduce the overall structural strength, and has the disadvantage of poor durability.

Another type of electric hammer damper device for improving the unevenness of the grip, as disclosed in U.S. Patent No. 7,523,791, the disclosure of which is incorporated herein by reference. The damper spring connected between the grip and the body provides a yaw buffer. However, during the application, the grip swings around the pivot point. Therefore, the damper spring will simultaneously receive the linear direction of the hammer movement. The force and the angle at which the grip is oscillated are stressed, and it is easy to distort the deformation, resulting in a problem of a decrease in service life or a misalignment of the hammer.

US Patent No. 7,886,838 is intended to improve the problem that a single damper spring is subjected to different directions of pressure and distortion. Two sets of damper spring sets are provided, one of which is responsible for damping the linear vibration caused by the hammer movement, and the other group It is responsible for buffering the yaw vibration caused by the swing of the grip. Although this design can slightly reduce the distortion of the single damper spring design, the use of multiple sets of damper mechanisms will complicate the overall structural design and increase the cost. The setting of multiple sets of damping springs will also increase the error range of the hammer hitting point, and still have room for improvement.

Therefore, the object of the present invention is to provide a simplified structure And an electric hammer with a damping device that increases the accuracy of the hitting point.

Therefore, the electric hammer having the damper device of the present invention comprises a casing unit, an electric hammer unit and a damper device.

The housing unit includes a housing and a driving grip, the driving grip has a pivoting end pivoted to the housing, and a pivoting end opposite to the pivoting end The free end of the fulcrum.

The electric hammer unit includes a hammer rod that is stretched and mounted to the housing unit, and a drive group that can be driven by the drive group to reciprocate along its length.

The damper device includes an orbiting arc connecting the housing and the free end, and an elastic member that is elastically abutted against the fixed rail and the housing unit, the fixed rail along the free end The oscillating path of the portion extends and moves through the housing unit.

The utility model has the advantages that the damping device can use the orbital arc rod to linearly vibrate the hammer rod and the driving grip with the pivotal end as a fulcrum and yaw and integrate into the same vibration path. The force of the elastic member is made uniform, thereby reducing the degree of distortion of the elastic member, and the driving grip is guided by the fixed-arc and actually moves along the yaw path thereof, thereby simplifying the overall structure and strengthening. Structural strength, extended service life and increased hammer point accuracy.

1‧‧‧Sheet unit

11‧‧‧Shell

111‧‧‧ front end

112‧‧‧ Back end

113‧‧‧Upper side

114‧‧‧Underside

12‧‧‧Auxiliary grip

13‧‧‧Drive grip

131‧‧‧ pivot end

132‧‧‧Free end

2‧‧‧Electric hammer unit

21‧‧‧ Hammer

22‧‧‧Drive Group

3‧‧‧ damping device

31‧‧‧ absorbing cushion

32‧‧‧ Orbital Arc

321‧‧‧Connected end

322‧‧‧Shock end

33‧‧‧Leather cover

34‧‧‧Flexible parts

Other features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention. And Figure 2 is a schematic view of the use of the preferred embodiment.

Referring to Figures 1 and 2, the present invention has an electric device with a damping device The preferred embodiment of the hammer comprises a housing unit 1, an electric hammer unit 2 and a damping device 3.

The housing unit 1 includes a housing 11, an auxiliary grip 12 and a drive grip 13.

The housing 11 is substantially L-shaped and has an opposite front end portion 111 and a rear end portion 112. The rear end portion 112 has an opposite upper side 113 and a lower side 114 connected to the front end portion 111.

The auxiliary grip 12 is fixed below the front end portion 111 and parallel to the rear end portion 112.

The driving grip 13 has a pivoting end 131 pivoted to the rear end portion 112, and a free end portion 132 opposite to the pivoting end portion 131 and swingable with the pivoting end portion 131 as a fulcrum. . In this embodiment, the pivoting end portion 131 is pivotally disposed on the lower side 114 of the rear end portion 112. However, it can be understood that the pivoting end portion 131 can also be pivotally connected to the upper side 113 and the lower side 114. The specific position between the two, thereby adjusting the actuation swing of the drive grip 13.

The electric hammer unit 2 includes a hammer rod 21 and a drive group 22 mounted to the rear end portion 112. The hammer rod 21 is attached to the front end portion 111, and is driven by the drive group 22 to reciprocate in the longitudinal direction thereof.

The damper device 3 includes a flexible cushion 31, a fixed rail rod 32, a flexible boot 33 and an elastic member 34.

The cushion 31 is interposed between the lower side 114 of the rear end portion 112 and the pivot end 131 of the drive grip 13 .

The fixed rail rod 32 is connected between the rear end portion 112 and the driving grip 13 and extends along the swinging path of the free end portion 132 to be movable and extended. The housing unit 1 drives the grip 13. The fixed rail rod 32 has a connecting end portion 321 fixedly disposed on the upper side 113 of the rear end portion 112, and a lower end portion 132 opposite to the connecting end portion 321 and extending through the driving grip 13 The end portion 322.

The dust jacket 33 is interposed between the shock absorbing end portion 322 of the fixed rail shaft 32 and the free end portion 132 of the driving grip 13 to prevent dust from entering the driving grip 13.

The elastic member 34 is disposed in the driving grip 13 and respectively protrudes from the shock absorbing end portion 322 of the fixed rail arch 32 and the free end portion 132 of the driving grip 13 . In this embodiment, the elastic member 34 is a compression spring.

In summary, during the application of the present invention, the linear vibration of the reciprocating movement of the hammer 21 and the driving grip 13 can be deflected with the pivotal end 131 as a fulcrum. The vibration is integrated into the same vibration path, so that the force of the elastic member 34 is uniform, thereby reducing the degree of distortion of the elastic member 34. Compared with the conventional shock absorption design, the overall structure can be simplified, and the structural strength can be increased and extended. The service life and the effective damping effect, furthermore, since the free end 132 of the drive grip 13 will be guided by the orbiting arc bar 32, so that the drive grip 13 does move along its own yaw path, The advantage of the accuracy of the hitting point of the hammer rod 21 is increased, so that the object of the present invention can be achieved.

It should be noted that the connecting end portion 321 of the fixed-arc lever 32 can also be fixed to the free end portion 132 of the driving grip 13 so that the shock-absorbing end portion 322 extends through the rear end. The upper side 113 of the portion 112 is disposed on the housing 11 so that the two ends are respectively biased against the shock absorbing end portion 322 and the rear end portion 112 of the housing 11. Head of.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

1‧‧‧Sheet unit

11‧‧‧Shell

111‧‧‧ front end

112‧‧‧ Back end

113‧‧‧Upper side

114‧‧‧Underside

12‧‧‧Auxiliary grip

13‧‧‧Drive grip

131‧‧‧ pivot end

132‧‧‧Free end

2‧‧‧Electric hammer unit

21‧‧‧ Hammer

22‧‧‧Drive Group

3‧‧‧ damping device

31‧‧‧ absorbing cushion

32‧‧‧ Orbital Arc

321‧‧‧Connected end

322‧‧‧Shock end

33‧‧‧Leather cover

34‧‧‧Flexible parts

Claims (8)

An electric hammer having a damper device includes: a housing unit including a housing and a driving grip, the driving grip having a pivotal end pivoted to the housing, and a pivot opposite to the pivot a free end portion that can be swung with the pivot end as a fulcrum; an electric hammer unit including a hammer rod that extends the mounting of the housing unit, and a driving group that can be driven by the driving group Driving and reciprocating along its length; and a damping device comprising an orbiting arc connecting the housing and the free end, and an elastic force of the rail and the housing unit The railing rod extends along the swinging path of the free end and moves through the housing unit. The electric hammer with a damper device according to claim 1, wherein the housing of the housing unit has an opposite front end portion and a rear end portion, and the driving grip is pivotally disposed at the rear end portion, the positioning An arcing rod is connected between the rear end portion and the free end portion, and the fixed railing rod of the damper device has a connecting end portion fixedly disposed at the rear end portion, and a connecting end portion opposite to the connecting end portion The shock-absorbing end portion of the free end of the driving grip is disposed in the driving grip and elastically abuts the shock-absorbing end portion and the free end portion. An electric hammer having a damper device according to claim 2, wherein the elastic member of the damper device is a compression spring. The electric hammer with a damper device according to claim 1, wherein the damper device further comprises a flexible dust jacket interposed between the fixed rail arc rod and the housing unit. The electric hammer with a damper device according to claim 4, wherein the housing of the housing unit has an opposite front end portion and a rear end portion, and the driving grip is pivotally disposed at the rear end portion, the positioning An arcing rod is connected between the rear end portion and the free end portion, and the fixed railing rod of the damper device has a connecting end portion fixedly disposed at the rear end portion, and a connecting end portion opposite to the connecting end portion a shock-absorbing end portion of the free end of the driving grip, the elastic member is disposed in the driving grip and is elastically abutted against the shock-absorbing end portion and the free end portion, and the dustproof sleeve is clamped on the shock-absorbing end portion Between this free end. The electric hammer with a damper device according to claim 1, wherein the damper device further comprises a flexible damper interposed between the housing and the pivotal end of the driving grip. The electric hammer with a damper device according to claim 1, wherein the housing of the housing unit is substantially L-shaped and has an opposite front end portion and a rear end portion, the rear end portion having an opposite one The upper side and the lower side are connected to the front end portion and are provided for the fixed rail arc rod, and the lower side is pivoted for the pivot end of the driving grip. The electric hammer with a damper device according to claim 7, wherein the housing unit further comprises an auxiliary grip fixed below the front end portion and parallel to the rear end portion.