Patent Application
20180222032
The present invention relates to a handheld power tool, and more particularly to a shock absorbing protection structure for a handheld power tool.
A conventional handheld power tool is operated reciprocately or rotatably. When the conventional handheld power tool is operated reciprocately by way of high pressure gas or electricity (i.e., the conventional handheld power tool is operated pneumatically or electrically), an impact part strikes a tool head reciprocately so as to cut, punch, eliminate rusts, and engrave workpieces.
Referring to
The power tool 90 includes a grip portion 90a and a support portion 90b, wherein the grip portion 90a is located between the drive block 911 and the coupling tube 913 of the body 91, and the support portion 90b is fixed on the fitting sheath 941 and corresponding to the tool head 94.
In operation, a user holds the grip portion 90a with one hand and grips the support portion 90b with the other hand. After turning on the switch 912, high pressure gas pushes the impact part 915 to move toward the transmission part 92 from the drive block 911 via air valve 914 so that the transmission part 92 is hit by the impact part 915. Thereafter, the high pressure gas is controlled by the air valve 914 to push the impact part 915 to strike the air valve 914, hence the impact part 915 is pushed reciprocately so as to strike the transmission part 92, and the push disc 922 of the transmission part 92 pushes the holding seat 943 of the tool head 94 so that the plurality of rust removal needles 944 are driven by the holding seat 943 to remove rusts.
However, the when the impact part 915 strikes the transmission part 92, reaction force passes to the other hand of the user which grips the support portion 90b, thus causing gripping discomfort, fatigue, and injury to the user's hands.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The primary objective of the present invention is to provide a shock absorbing protection structure for a handheld power tool which contains a shock absorption sleeve fitted on an outer wall of a joining portion of a power tool, and between the shock absorption sleeve and the joining portion is defined at least one stopper, such that the shock absorption sleeve and the at least one stopper absorb vibration as the handheld power tool operates, thus reducing reaction force to user's hands.
To obtain above-mentioned objective, a shock absorbing protection structure for a handheld power tool provided by the present invention contains: a power tool, a shock absorption sleeve, and at least one stopper.
The power tool includes a drive block for providing vibration power, and the driving block has a switch disposed on the drive block so as to turn on/off the drive block, the driving block also has a coupling tube connecting with the drive block, the coupling tube has a tool head fixed on one end of the coupling tube away from the drive block, and the power tool includes a joining portion formed on an outer wall of the power tool;
The shock absorption sleeve is fitted on an outer wall of the joining portion of the power tool, and between the shock absorption sleeve and the joining portion is defined an accommodation space.
The at least one stopper is flexible and is defined between the shock absorption sleeve and the joining portion of the power tool, and the at least one stopper is located at the accommodation space so as to absorb vibration.
The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, a preferred embodiment in accordance with the present invention.
With reference to
The power tool 10 includes a body 11, a transmission part 12, a connection unit 13, and a tool head 14, wherein the body 11 has a drive block 111, a switch 112 disposed on the drive block 111, and a coupling tube 113 connecting with the drive block 111. The coupling tube 113 has an orifice 1131 defined on a central position of one end thereof away from the drive block 111, and the coupling tube 113 also has a groove 1132 formed on an outer wall thereof, wherein the groove 1132 has two notches 1133 communicating with the orifice 1131, the coupling tube 113 further has a chamber 1134 communicating with the orifice 1131, wherein the chamber 1134 houses an air valve 114 adjacent to the drive block 111, and the chamber 1134 also accommodates an impact part 115 moving between the air valve 114 and the orifice 1131. The transmission part 12 has a column 121 and a push disc 122, the connection unit 13 has two limitation protrusions 131 and a defining ring 132, wherein the column 121 of the transmission part 12 inserts into the orifice 1131 of the coupling tube 113 of the body 11, the two limitation protrusions 131 of the connection unit 13 are housed in the two notches 1133 of the coupling tube 113, the defining ring 132 of the connection unit 13 retains in the groove 1132 of the coupling tube 113 so that the transmission part 12 is fixed in the one end of the coupling tube 113 away from the drive block 111. The tool head 14 includes a fitting sheath 141 fitted on the outer wall of the coupling tube 113, the fitting sheath 141 houses a resilient element 142 and a holding seat 143, the holding seat 143 accommodates a plurality of rust removal needles 144 extending out of the fitting sheath 141, and the holding seat 143 abuts against the push disc 122 of the transmission part 12.
The power tool 10 includes a grip portion 10a and a joining portion 10b, wherein the grip portion 10a is located between the drive block 111 and the coupling tube 113 of the body 11. In this embodiment, the joining portion 10b is the coupling tube 113 and the fitting sheath 141.
The shock absorption sleeve 20 is fitted on an outer wall of the joining portion 10b of the power tool 10, and between the shock absorption sleeve 20 and the joining portion 10b is defined an accommodation space A1.
The at least one stopper 30 is flexible, and there are a first stopper 30a and a second stopper 30b provided in this embodiment. The first stopper 30a is formed in a ring shape and includes multiple first spaced projections 31a, the second stopper 30b is formed in a ring shape and includes multiple second spaced projections 31b, wherein the first stopper 30a and the second stopper 30b are defined between the shock absorption sleeve 20 and the joining portion 10b of the power tool 10, the multiple first spaced projections 31a of the first stopper 30a and the multiple second spaced projections 31b of the second stopper 30b are biased against an inner wall of the shock absorption sleeve 20, and the first stopper 30a and the second stopper 30b are located at the accommodation space A1 so as to absorb vibration.
Referring to
Referring to
Thereby, the shock absorbing protection structure of the present invention has advantages as follows:
The shock absorption sleeve 20 is fitted on the outer wall of the joining portion 10b of the power tool 10, and the at least one stopper 30 is defined between the shock absorption sleeve 20 and the joining portion 10b, such that the shock absorption sleeve 20 and the at least one stopper 30 absorb vibration as the handheld power tool operates, thus reducing reaction force to user's hands, operating the handheld power tool easily, and protecting the user's hand.
While various embodiments in accordance with the present invention have been shown and described, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
