CN201511357U

CN201511357U - Swing power tool

Info

Publication number: CN201511357U
Application number: CN2009201742041U
Authority: CN
Inventors: 霍立祥; 吴海全
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2009-09-15
Filing date: 2009-09-15
Publication date: 2010-06-23
Anticipated expiration: 2019-09-15

Abstract

The utility model relates to a swing power tool, which comprises a shell (11) and an output shaft (12) which extends from the shell (11), wherein a motor (13) arranged in the shell (11) and a drive mechanism (14) drive the output shaft (12) to enclose the shaft axis thereof to carry out the swing motion, the free end of the output shaft (12) is connected with an attachment working head which is of a non-central symmetrical shape, the output shaft (12) is of the non-central symmetrical shape relative to the shaft axis, a balance weight (15) is integrally formed on the output shaft (12), and the balance weight (15) and the core of the attachment working head are respectively located on the two sides of the shaft axis. Or a groove (20) is formed on the output shaft (12), and the groove and the core of the attachment working head are respectively located on the same side of the shaft axis. Since the balance weight or the groove are integrally formed on the output shaft, the output shaft has a function of balance compensation relative to the attachment working heads such as a straight sawblade which are of the non-central symmetrical shape and are connected on the output shaft, thus smaller shock generated on the output shaft can be realized. Simultaneously, the attachment working head does not need any change, thereby manufacturing cost can be effectively saved.

Description

The swing power tool

Technical field

The present invention relates to a kind of swing power tool of hand-held.

Background technology

Multi Role Aircraft is the common swing power tool of industry, and its operation principle is that output shaft centers on axial line and does oscillating motion.Therefore, when the user is being equipped with different annex working heads on the output shaft after, can realize multiple different operating function, as sawing, cut, grind, scrape etc., to adapt to different work requirements.

At present, applied annex working head generally includes straight blade, saw blade, triangle frosted dish etc. in the swing power tool, wherein, because saw blade and triangle frosted dish itself all are centrosymmetric shapes, therefore, the vibrations of output shaft generation when work feel less.And straight blade is owing to itself be non-central symmetric shape.Because the application point of straight blade is positioned at a side of output shaft, himself be unbalanced in swing process, thereby can bring bigger vibrations, and this vibrations meeting is passed on the housing of swing power tool by output shaft.Therefore, in use, straight blade tends to produce bigger seismaesthesia.If the user is under the situation of the Multi Role Aircraft of long-time use employing straight blade, numb feel is felt will be unfavorable for that the user uses, and also have influence on user's hand health.

For addressing this problem, U.S. Patent application US20030176225A discloses a kind of straight blade of subsidiary balance weight, comprise the connecting hole that connects output shaft, and the sawtooth portion that is positioned at connecting hole one side, simultaneously, in the other side with respect to sawtooth portion, that also extends is provided with a balance weight, the weight of balance weight multiply by the distance resulting moment of its center of gravity to connecting hole, multiply by its center of gravity with the weight of sawtooth portion and equates haply to the resulting moment of the distance of connecting portion.Like this, just can on output shaft, reach a kind of effect of dynamic equilibrium, help to reduce seismaesthesia.

But such technical scheme is aimed at annex working head design, need on each annex working head balance weight be set all, has increased the manufacturing cost of annex greatly.

Therefore, be necessary prior art is improved in fact, to address the above problem.

Summary of the invention

The object of the present invention is to provide a kind of swing power tool, when the user adopts the work of asymmetric annex working head, can reduce to be passed to the vibrations on the output shaft, simultaneously, can also provide lower manufacturing production cost.

For achieving the above object, the invention provides a kind of swing power tool, comprise housing and the output shaft that in housing, extends, being arranged on the motor of enclosure interior and transmission mechanism drives output shaft and does oscillating motion around self axial line, be connected with the annex working head of non-centrosymmetry shape at the free end of output shaft, described output shaft is the non-centrosymmetry shape with respect to axial line, one-body molded on the output shaft have balance weight, and the center of gravity of balance weight and annex working head lays respectively at the both sides of axial line.

Preferably,

Described balance weight is positioned at the side towards the housing that contains motor; The center of gravity of described balance weight is identical to the moment of axial line with the center of gravity of the annex working head of described non-centrosymmetry shape to the moment of axial line; The annex working head of described non-centrosymmetry shape comprises straight blade.

For achieving the above object, the present invention also provides a kind of swing power tool, comprise housing and the output shaft that in housing, extends, being arranged on the motor of enclosure interior and transmission mechanism drives output shaft and does oscillating motion around self axial line, be connected with the annex working head of non-centrosymmetry shape at the free end of output shaft, described output shaft is the non-centrosymmetry shape with respect to axial line, is formed with groove on the output shaft, and the center of gravity of annex working head lays respectively at the same side of axial line.

Preferably,

Described groove is positioned on the output shaft back in a side of the housing that contains motor; With respect to groove, the center of gravity of part of output shaft that is positioned at the axial line opposite side is identical with the moment that the center of gravity of the annex working head of described non-centrosymmetry shape arrives axial line to the moment of axial line; The annex working head of described non-centrosymmetry shape comprises straight blade.

Swing power tool among the present invention, because one-body molded on the output shaft have balance weight or a groove, thereby make output shaft have balanced compensated effect, can be implemented in the less seismaesthesia of generation on the output shaft with respect to the annex working head that connects non-centrosymmetry shapes such as straight blade thereon.Simultaneously, the annex working head can it goes without doing any change, effectively saved manufacturing cost.

Description of drawings

Fig. 1 for first embodiment of swing power tool among the present invention schematic perspective view.

Fig. 2 is the cutaway view of swing power tool.

Fig. 3 is the user mode reference diagram of swing power tool, and this moment, straight blade was along swing counterclockwise.

Fig. 4 is for the user mode reference diagram of swing power tool, this moment, straight blade was positioned at initial position.

Fig. 5 is for the user mode reference diagram of swing power tool, this moment, straight blade was swung along clockwise direction.

Fig. 6 is the cutaway view of second embodiment of swing power tool among the present invention.

Related elements reference numeral in the diagram is as follows:

10, Multi Role Aircraft 11, housing 12, output shaft

13, motor 14, transmission mechanism 15, balance weight

20, groove 30, straight blade

The specific embodiment

The present invention is described in further detail below in conjunction with drawings and the specific embodiments.

See also Fig. 1, a kind of swing power tool, especially a kind of swing power tool of hand-held, promptly Multi Role Aircraft 10, the output shaft 12 that comprises housing 11 and extend in housing 11.Wherein, be provided with motor 13 and transmission mechanism 14 (see figure 2)s in housing 11, output shaft 12 is through the driving of motor 13, under the moment of torsion of transmission mechanism 14 transmits, can do oscillating motion around the axial line X of himself, shown in the direction of motion double-head arrow as shown in fig. 1.After the free end of output shaft 12 is connected with different annex working heads, promptly can realize different operations.

Need to prove that transmission mechanism has adopted the mode of common eccentric wheel of industry and pull-fork assembly, does not elaborate at this.

As shown in Figure 1, after the free end of output shaft 12 has connected straight blade 30, because straight blade 30 is non-centrosymmetrical shape, promptly with the connecting portion of output shaft 12 in an end of straight blade 30, and the working position with sawtooth is in the other end of straight blade 30, after straight blade 30 was done oscillating motion along with output shaft 12, the seismaesthesia that causes was stronger.Therefore, for balance vibrations, on output shaft 12, the also integrated balance weight 15 that is provided with, size and shape are not done requirement, still need satisfy M1 and take advantage of L1 to equal M2 haply to take advantage of L2.Wherein, M1 represents the quality of balance weight 15, and M2 represents the quality of straight blade 30, and L1 represents the distance of the center of gravity of balance weight 15 to output shaft 12, and L2 represents the distance of the center of gravity of straight blade 30 to output shaft 12.

By such mode, with respect to output shaft 12, the straight blade 30 that is connected on the output shaft 12 in use will be reached a kind of state of dynamic equilibrium with balance weight 15, help reducing the seismaesthesia of generation on the output shaft 12.

See also Fig. 3, Fig. 4 and Fig. 5.Wherein, in Fig. 4, other is positioned at balance weight 15 and straight blade 30 minutes the both sides of output shaft 12 and is 180 ° of angles and be provided with, and it is defined as initial position here.And in Fig. 3, straight blade 30 around the counterclockwise swing of output shaft 12 certain angle θ, same, eccentric block 15 along with output shaft 12 counterclockwise swing too identical angle θ, it is constant still to keep 180 ° of phase angles between the two, in Fig. 5, straight blade 30 is around the output shaft 12 clockwise certain angle θ that swung, same, eccentric block 15 has been along with too clockwise of output shaft 12 swung identical angle θ, and it is constant still to keep 180 ° of phase angles between the two.Like this, in the swing process of output shaft 12, eccentric block 15 has played and has kept the dynamic balancing effect of straight blade 30 swings, thereby can reduce the seismaesthesia on the output shaft 12.

See also Fig. 6, be second embodiment of swing power tool disclosed in this invention.Different with first embodiment is, do not have the one-body molded balance weight that has on the output shaft 12, but output shaft 12 is provided with groove 20, groove 20 be arranged on usually output shaft 12 on the lengthwise bearing of trend of housing 11, thereby make output shaft 12 present non-centrosymmetrical structure.

During use, when the user when using the annex working head of the such non-centrosymmetry formula of straight blade, because output shaft 12 self forms asymmetric form, with respect to axial line, the weight that is formed with that side of groove 20 will be less than the opposite side of output shaft 12, at this moment, replenishing of weight by straight blade 30, for axial line, the moment of output shaft 12 both sides recovers to reach a kind of dynamic equilibrium state again, thereby can realize the damping effect identical with embodiment one.

Need to prove,, therefore can not increase any extra manufacturing production cost attachment owing to attachment is not improved among the present invention.

Claims

1. swing power tool for one kind, the output shaft (12) that comprises housing (11) and in housing (11), extend, being arranged on inner motor (13) of housing (11) and transmission mechanism (14) drives output shaft (12) and centers on self axial line and do oscillating motion, be connected with the annex working head of non-centrosymmetry shape at the free end of output shaft (12), it is characterized in that: described output shaft (12) is the non-centrosymmetry shape with respect to axial line, output shaft (12) is upward one-body molded balance weight (15), and the center of gravity of balance weight (15) and annex working head lays respectively at the both sides of axial line.

2. swing power tool as claimed in claim 1 is characterized in that: described balance weight (15) is positioned at the side towards the housing that contains motor (13) (11).

3. swing power tool as claimed in claim 2 is characterized in that: the center of gravity of described balance weight (15) is identical to the moment of axial line with the center of gravity of the annex working head of described non-centrosymmetry shape to the moment of axial line.

4. swing power tool as claimed in claim 3 is characterized in that: the annex working head of described non-centrosymmetry shape comprises straight blade (30).

5. swing power tool for one kind, the output shaft (12) that comprises housing (11) and in housing (11), extend, being arranged on inner motor (13) of housing (11) and transmission mechanism (14) drives output shaft (12) and centers on self axial line and do oscillating motion, be connected with the annex working head of non-centrosymmetry shape at the free end of output shaft (12), it is characterized in that: described output shaft (12) is the non-centrosymmetry shape with respect to axial line, be formed with groove (20) on the output shaft (12), and lay respectively at the same side of axial line with the center of gravity of annex working head.

6. swing power tool as claimed in claim 5 is characterized in that: described groove (20) is positioned at output shaft (12) and goes up back in a side of the housing that contains motor (13) (11).

7. swing power tool as claimed in claim 6, it is characterized in that: with respect to groove (20), the center of gravity of part of output shaft (12) that is positioned at the axial line opposite side is identical with the moment that the center of gravity of the annex working head of described non-centrosymmetry shape arrives axial line to the moment of axial line.

8. swing power tool as claimed in claim 7 is characterized in that: the annex working head of described non-centrosymmetry shape comprises straight blade (30).