IMPACT BLOCK, CARRIER MEMBER AND IMPART TOOL USING SAMES

Abstract

An impact block, a carrier member mating the impact block and an impact tool using the impart block and the mating carrier member are disclosed. The impact block includes an annular body including an outer race, an inner race, a positioning portion provided with the outer race for bump fit and extending in the axial direction of the annular body and one or multiple impact portion provided with the inner race. By using the impact tool composed of the above impact block and the matching carrier member, the vibration generated by the striking process can be reduced, the striking efficiency is improved, the service life is increased, the component composition is simplified, the assembly procedure is quick and simple.

Claims

1. An impact block for impact tool, comprising an annular body, said annular body comprising an outer race and an inner race, said outer race providing with a positioning portion for bump fit, said positioning portion extending along the axial direction of said annular body, said inner race providing with at least one impact portion.

2. The impact block as claimed in claim 1, wherein said annular body further comprises two opposing end faces; said positioning portion extend between said two end faces.

3. A carrier member for carrying the impact block as claimed in claim 1, comprising a bottom portion, a circumferential wall provided on said bottom portion and a chamber formed between said bottom portion and said circumferential wall; said positioning portion of said impact block is pivotally connected to said circumferential wall within said chamber to let said impact block be disposed inside said chamber.

4. The carrier member as claimed in claim 3, wherein said circumferential wall of said carrier member is provided with at least one second positioning portion corresponding to an inner circumferential surface of said chamber for bump fit, said at least one second positioning portion extending along the axial direction of said carrier member and configured to fit said positioning portion of said impact block.

5. The carrier member as claimed in claim 3, further comprising an end cover capped on said circumferential wall to enclose said chamber.

6. An impact tool comprising at least one impact block as claimed in claim 1.

7. An impact tool comprising a carrier member as claimed in claim 3.

8. An impact tool, comprising: the carrier member and at least one impact block as claimed in claim 3 the at least one impact block being pivotally mounted within the said chamber of said carrier member; and a rotary shaft comprising a bottom end, said rotary shaft being coaxially mounted with said at least one impact block within said chamber of said carrier member, said bottom end being disposed on said bottom portion of said carrier member; wherein the said positioning portion of each said impact block is pivotally connected to said circumferential wall of said carrier member corresponding to an inner circumferential surface of said chamber.

9. The impact tool as claimed in claim 8, further comprising a pin axially connected between said bottom end of said rotary shaft and a motor driving shaft that is inserted through said bottom portion of said carrier member and connected to said bottom end of said rotary shaft.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is an oblique elevational view of an impact tool in accordance with the present invention.

[0014] FIG. 2 is an exploded view of the impact tool shown in FIG. 1.

[0015] FIG. 3 is a side view of the impact tool shown in FIG. 1.

[0016] FIG. 4 is a sectional view taken along line 4-4 of FIG. 3.

[0017] FIG. 5 is a cross-sectional view of the carrier member.

[0018] FIG. 6 is a cross-sectional view of the impact block.

[0019] FIG. 7 is a sectional view taken along line 7-7 of FIG. 3.

[0020] FIG. 8 is a sectional view taken along line 8-8 of FIG. 3.

[0021] FIG. 9 is an exploded view of an alternate form of the impact tool.

[0022] FIG. 10 is an exploded view of another alternate form of the impact tool.

[0023] FIG. 11 is similar to FIG. 7, illustrating an alternate form of the impact tool.

[0024] FIG. 12 is an exploded view of still another alternate form of the impact tool.

DETAILED DESCRIPTION OF THE INVENTION

[0025] The invention provides an impact block for impact tool, a carrier member for carrying the impact block and an impact tool using the impact block and the carrier member. The invention can be applied to a power tool mainly driven by a pneumatic motor or an electric motor, and the driving shaft of the motor can drive the impact tool to generate a rotation and a striking effect. The impact block of the present invention can be widely applied to various impact tools and power tools.

[0026] Those skilled in the art should be able to understand that the description of the present preferred embodiment is a generic description that does not limit the application field. For example, the terms such as a combination, a connection relationship, or a directional relationship are merely examples, and the number of components one includes one and more than one number of complex components.

[0027] Referring to FIGS. 1-6, an impact block 10 for impact tool 1 generally comprises an annular body 12. The annular body 12 defines an outer race 13, an inner race 14 and two opposing end faces 15. As illustrated in FIG. 6, the outer race 13 is provided with a first positioning portion 16 for bump fit. In the present preferred embodiment, the first positioning portion 16 is exemplified by a convex shape. The first positioning portion 16 extends along the axial direction of the annular body 12 between the two end faces 15. The inner race 14 is provided with at least one impact portion 18, and the at least one impact portion 18 of the preferred embodiment is formed of two opposing claw-shaped regions.

[0028] The impact tool 1 provided by the preferred embodiment of the present invention includes two impact blocks 10 coaxially arranged in a 180 degree up and down symmetric relationship. As illustrated in FIG. 2, the two impact blocks 20 are mounted around a rotary shaft 20 in the same axial direction with the end faces 15 of one impact block 20 disposed in parallel to that of the other. The outer peripheral surface of the rotary shaft 20 has two mutually spaced lugs 22. As shown in FIGS. 7 and 8, the lug 22 and the impact portion 18 of each of the impact blocks 10 can abut or separate from each other according to the change in the rotation angle. The rotary shaft 20 and the impact blocks 10 are coaxially mounted within a carrier member 30. As shown in FIGS. 2-5, the carrier member 30 is generally cylindrical, comprising a bottom portion 32, a circumferential wall 34 provided on the bottom portion 32 and a chamber 36 formed between the bottom portion 32 and the circumferential wall 34. The cross-sectional shape of the chamber 36 is approximately the same and slightly larger than the cross-sectional shape of the impact blocks 10. The circumferential wall 34 of the carrier member 30 is provided with two second positioning portions 38 corresponding to the inner circumferential surface of the chamber 36. The two second positioning portions 38 fit the first positioning portions 16 of the impact blocks 10 respectively. The second positioning portions 38 of the preferred embodiment are mutually symmetrical and directly recessed in the inner peripheral surface, each extending along the axial direction of the carrier member 30. In the example shown in FIG. 10 and FIG. 11, the first positioning portion 16 is a groove, and the second positioning portions 38 are convex shaped. Similarly, each impact block 10 can be disposed inside the carrier member 30.

[0029] As shown in FIGS. 2-8, the two impact blocks 10 and the rotary shaft 20 are directly disposed inside the chamber 36 of the carrier member 30 with an inner end 24 of the rotary shaft 20 abutted against the bottom portion 32 of the carrier member 30 and the first positioning portion 16 of each impact block 10 fitting into one respective second positioning portion 38 of the carrier member 30. Further, an end cover 39 is capped on an end edge of the circumferential wall 34 to enclose the chamber 36. A cooling lubricant can be applied to the inside of the chamber 36. The opposite outer end 26 of the rotary shaft 20 extends out of the end cover 39. Thus, the impact tool 1 is assembled. Each impact block 10 is pivoted with respect to the carrier member 30 by the first positioning portion 16 thereof that is pivotally inserted into the respective second positioning portion 38 of the carrier member 30. The motor driving shaft 40 of the power tool is inserted through the center of the bottom portion 32 of the carrier member 30 and connected with the inner end 24 of the rotary shaft 20. A pin 50 is axially connected between the inner end 24 of the rotary shaft 20 and the motor driving shaft 40 to increase the coaxiality between the motor driving shaft 40 and the rotary shaft 20, reducing transmission vibration.

[0030] With the above-described constituent component parts of the present invention, the motor driving shaft 40 can directly drive the carrier member 30 to rotate. Through the pivoting between the first positioning portions 16 of the impact blocks 10 and the respective second positioning portions 38 of the carrier member 30, the impact blocks 10 are biased into contact with or away from the respective lugs 22 of the rotary shaft 20 to generate torque or impact.

[0031] Since the first positioning portion 16 is directly and integrally formed on the outer race 13 of the impact block 10 for bump fit and the first positioning portion 16 is directly and pivotally connected to the respective second positioning portion 38, the composition of the invention is simplified, the assembly procedure is quick and simple, the vibration of the striking process is reduced, and the striking efficiency is improved. Furthermore, since the chamber 36 of the carrier member 30 is closed, the cooling lubricant inside the carrier member 30 is not worn out or spilled outward, and the overall service life of the impact tool 1 can be increased.

[0032] Referring to FIGS. 9-12, the impact tool, referenced by 60, simply comprises one single impact block 10. The first positioning portion 16 of the impact block 10 and the second positioning portion 38 of the carrier member 30 are configured for bump fit with one in the form of a groove and the other in the form of a convex shape.