The present invention relates to power tool technology, and more particularly to an impact block, a mating carrier member and an impact tool using the impact block and the carrier member.
In order to make the pneumatic tools or electric tools have greater torque and impact force, impact power tools made by adding an impact tool to simple power tools become common repair tools.
Various impact tools for power tool are known. For the advantages of capable of delivering more torque and having a high structural strength, the twin-hammer impact tool composed of two annular impact blocks and a rotary shaft has been widely used in different pneumatic tools.
U.S. Pat. No. 6,491,111 discloses a rotary impact tool having a twin hammer mechanism that generally includes a carrier member, a pair of hollow hammer members 40 pivotally positioned in a channel 38 within the carrier member 20 by a respective pin so the hollow hammer members 40 rotate with the carrier member under drive from an air motor output shaft.
However, the composition of the aforementioned twin-hammer impact tool is still relatively complicated, the assembly is not easy, the service life is also short, and the vibration is large when used, and the operability cannot meet the needs of use. An improvement is needed.
The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide an impact block, a carrier member and an impact tool using the impact block and the carrier member, which reduces vibration during striking, improves striking efficiency, prolongs service life, simplifying component composition and facilitating quick assembly.
To achieve this and other objects of the present invention, an impact block for impact tool comprises an annular body. The annular body comprises 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 at least one impact portion provided with the inner race.
To achieve this and other objects of the present invention, a carrier member comprises bottom portion, a circumferential wall provided on the bottom portion and a chamber formed between the bottom portion and the circumferential wall. The positioning portion of the impact block is pivotally connected to the circumferential wall within the chamber to let the impact block be disposed inside the chamber.\
To achieve this and other objects of the present invention, an impact tool comprises the aforesaid carrier member, at least one above-described impact block pivotally mounted within the chamber of the carrier member, and a rotary shaft coaxially mounted with the at least one impact block within the chamber of the carrier member. The rotary shaft comprises a bottom end disposed on the bottom portion of the carrier member. The positioning portion of the impact block is pivotally connected to the circumferential wall of the carrier member corresponding to an inner circumferential surface of the chamber. Since the positioning portion of the impact block is integrally formed on the annular body and pivotally connected to the inside of the carrier member by bump fit, 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.
Preferably, the impact tool further comprises an end cover capped on the circumferential wall to enclose the chamber. Thus, the cooling lubricant inside the carrier member is not worn out or spilled outward, and the overall service life of the impact tool can be increased.
Preferably, the impact tool further comprises a pin axially connected between the bottom end of the rotary shaft and a motor driving shaft that is inserted through the bottom portion of the carrier member and connected to the bottom end of the rotary shaft.
Other and further benefits, advantages and features of the present invention will be understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference characters denote like elements of structure.
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.
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.
Referring to
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
As shown in
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.
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.
Referring to
Number | Date | Country | Kind |
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107120198 | Jun 2018 | TW | national |
107122081 | Jun 2018 | TW | national |