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The invention relates to a hand-held power tool which belongs to the technical field of electric power tools.
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Conventional hand-held power tools have been serialized with each having individual functions. Operators have to select different tools according to different functions to accomplish certain work, which seriously affects the working efficiency. Besides, the use of multiple tools is not beneficial for tool management. Particularly, those small accessory tools easily lose, thereby being time-wasting and laborious.
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In view of the above-described problems, it is one objective of the invention to provide a hand-held power tool.
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To achieve the above objective, in accordance with one embodiment of the invention, there is provided a hand-held power tool. The hand-held power tool comprises: a motor controlled by a switch, a transmission mechanism actuated by the motor, a rotating head disposed at a front part and driven by the transmission mechanism to rotate, and a battery supplying electric power for the motor. The motor, the transmission mechanism, and the battery are disposed in a casing. A rear cover is disposed at a rear part of the casing, and the rear cover comprises a space for accommodating a cutting mechanism and allowing the cutting mechanism to move therein. The cutting mechanism comprises a blade and an operating part. The operating part protrudes or retracts the blade via a gap of the rear cover.
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The cutting mechanism further comprises a supporting piece. A lower part of the blade is attached to the supporting piece, and a lower part of the supporting piece is in active connection with the operating part.
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An outer surface of the rear cover comprises a chute for accommodating the operating part and enabling the operating part to slide in an axial direction without departing from the chute. The supporting piece is driven by the operating part to slide in the axial direction within a space of the rear cover.
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A neck having a shape matching with a shape of one end of the operating part is disposed on a contact surface between the operating part and the chute of the rear cover. When the operating part slides upwards in an axial direction of the chute to protrude the blade from the gap of the casing to a certain length, the contact surface is pressed by the operating part to lock the operating part in the neck.
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The casing is symmetrically assembled by a pair of two side casings, whereby forming a space for accommodating the motor, the transmission mechanism, and the battery. The rear cover is clamped by the two side casings at the rear part of the casing.
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The rear cover is made of a metal or a plastic. The rear cover itself can be used as a hammer.
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Preferably, the rear cover is provided with a metal block having a hardness higher than that of a material of the rear cover. When the rear cover is made of the metal or the plastic having a relatively low hardness, the metal block having a relatively high hardness is optionally disposed on the rear cover for enhancing the hardness, thereby using the metal block as the hammer.
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The rear cover further comprises a V-shaped nail pulling hole for pulling out nails. The nail pulling hole is disposed on an end part of one end of the rear cover.
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The rear cover is integrated as a whole or is formed by symmetrically assembling a first rear cover and a second rear cover.
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The rear cover is provided with the metal block having the hardness higher than that of the material of the rear cover, and the metal block is disposed at a bottom part of the metal block.
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The bottom part of the rear cover is provided with a slot. A clasp is disposed on a mounting surface of the metal block facing the slot for matching with the slot. The metal block is mounted in the slot or disassembled from the slot by the clasp.
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The hand-held power tool is a screw driver or an electric drill.
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Advantages of the invention are summarized as follows:
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The hand-held power tool of the invention is suitable for the operator to operating the tool by one hand, thereby being convenient and of high security. A plurality of tools coordinate with each other within a limited space, and it is unnecessary for the operator to change the tools frequently, so that it is convenient to manage the tools and the work efficiency is improved.
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The invention is described hereinbelow with reference to the accompanying drawings, in which:
- FIG. 1 is a first structure diagram of a hand-held power tool;
- FIG. 2 is a second structure diagram of a hand-held power tool;
- FIG. 3 is a structure diagram of FIG. 1 showing a blade being protruded;
- FIG. 4 is a structure diagram of FIG. 3 in the absence of a side casing;
- FIG. 5 is a structure diagram showing a rear cover separated from a main body of a hand-held power tool;
- FIG. 6 is a structure diagram of a rear cover of FIG. 5;
- FIG. 7 is a first structure diagram of a combination of a rear cover and a cutting mechanism;
- FIG. 8 is a second structure diagram of a combination of a rear cover and a cutting mechanism;
- FIG. 9 is a structure diagram of a combination of a first rear cover and a retracted cutting mechanism of FIG. 7;
- FIG. 10 is a structure diagram of a combination of a first rear cover and a protruded cutting mechanism of FIG. 7;
- FIG. 11 is a structure diagram of a second rear cover of FIG. 7;
- FIG. 12 is a structure diagram of a cutting mechanism; and
- FIG. 13 is a rear cover according to another embodiment of the invention.
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For further illustrating the invention, experiments detailing a hand-held power tool are described below. It should be noted that the following examples are intended to describe and not to limit the invention.
Example 1
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As shown in FIGS. 1-4, a screw driver is exemplified as a common hand-held power tool and has the same principles as other hand-held power tools. The screw driver comprises: a motor 102 controlled by a switch 101, a transmission mechanism 103 actuated by the motor, a rotating head 104 being disposed at a front part and driven by the transmission mechanism to rotate, and a battery 105 supplying electric power for the motor. The motor 102, the transmission mechanism 103, and the battery 105 are all encapsulated in a casing 100, and the casing 100 is in an L-shape suitable for being held by one hand. The switch 101 is disposed on the casing 100 which enables an operator to use fingers (such as an index finger or a middle finger) except a thumb to trigger a movable position while holding the casing. Generally, the casing 100 is symmetrically assembled by a pair of two side casings, thereby forming a space for accommodating the motor, the transmission mechanism, and the battery.
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As shown in FIGS. 5-8, a rear cover 1 is clamped by the two side casings at a rear part of the casing. The rear casing 1 comprises a space for accommodating a cutting mechanism 2 and allowing the cutting mechanism 2 to move therein. As shown in FIG. 12, the cutting mechanism 2 comprises a blade 21, an operating part 22, and a supporting piece 23. A lower part of the blade 21 is attached to the supporting piece 23, and a lower part of the supporting piece 23 is in active connection with the operating part 22. In this example, the supporting piece 23 is provided with a circular axis 231. An axial direction of the circular axis 231 is perpendicular to a movement direction of the blade 21. The operating part 22 is able to rotate around the circular axis 231 within a certain range.
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As shown in FIGS. 9-11, an outer surface of the rear cover 1 is provided with a chute 11 for accommodating the operating part 22 and enabling the operating part 22 to slide along an axial direction without departing from the chute. When the operator holds the casing, the operating part 22 is pushed by the thumb to slide in the axial direction of the chute 11, so that the supporting piece 23 is driven by the operating part 22 to slide in the axial direction within the space of the rear cover 1, thereby protruding or retracting the blade 21 from a gap 15. A neck 111 having a shape matching with a shape of an upper part or a lower part of the operating part 22 is disposed on a contact surface of the chute 11 of the rear cover 1 facing the operating part 22. When the operating part 22 is pushed to slide upwards in the axial direction of the chute 11 to protrude the blade 21 out of the gap 15 of the casing to a certain length, the contact surface is pressed by the corresponding upper part or the lower part of the operating part 22, so that the upper part or the lower part of the operating part 22 is locked by the neck 111, thereby limiting the blade 21 and the supporting piece 23 from free sliding. When the upper part or the lower part of the operating part 22 is pulled out of the neck 111, the operating part is pushed to retract the blade 21 into the rear cover. A spring (not indicated in the figures) is disposed in the rear cover. One end of the spring is connected to a lower end of the supporting piece, and the other end of the spring is connected to the rear cover. When the lower part of the operating part 22 is released from the neck 111, the supporting piece is reset under the action of the spring and retracts the blade 21 into the rear cover.
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When the blade is protruded from the gap, the blade can be used to cut materials of relatively low hardness. After the cutting, the blade is retracted into the recover by controlling the operating part, thereby ensuring the security of the hand-held power tool.
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As shown in FIGS. 1-3, and 6, the rear cover 1 itself is made of material having a certain hardness, such as a metal material or a plastic material, so that the rear cover 1 is enabled to knock or hit elements or other positions. Preferably, a bottom part 12 of the rear cover 1 is provided with a metal block 3 having a relatively high hardness, that is, a bottom part of one end of the L-shaped casing, so that it is convenient for the operator to better exert a force on the position to be knocked or hit when holding the hand-held power tool, and it is not necessary to readjust the direction or position of the hand-held power tool.
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As shown in FIGS. 1-3, and 6, the rear cover 1 is further provided with a V-shaped nail pulling hole 4. The nail pulling hole is a through hole or a blind hole. The nail pulling hole is able to accommodate a nail head and pull out the nail, thereby functioning as a nail puller. Preferably, the nail pulling hole 4 is disposed at a position on the rear cover in the vicinity of an end part of one end of the L-shaped casing. The end part of the casing functions as a leverage for enhancing a force, thereby saving the force for pulling out the nail. Preferably, the nail pulling hole 4 is disposed on the metal block 3 having a certain hardness for avoiding damage caused by the nail pulling.
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As shown in FIGS. 6-7, in this example, the rear cover 1 is formed by symmetrically assembling a first rear cover 13 and a second rear cover 14. The gap 15 is disposed on a relative contact surface of the first rear cover 13 and the second rear cover 14 for accommodating the blade. In other modes for carrying out the invention, the rear cover can be integrated as a whole, and the upper part thereof, that is, an external part of a turning part of the L-shaped casing, is provided with the gap for accommodating the blade.
Example 2
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This example is based on Example 1, in order to reduce the weight and saving the cost, the rear cover is made of a plastic material, and the bottom part of the rear cover 3 is provided with the metal block having a hardness higher than that of the material of the rear cover. The bottom part 12 of the rear cover 1 comprises a slot 121. A mounting surface of the metal block 3 facing the slot 121 is provided with a clasp 122 matching with the slot 121, so that the metal block 3 is mounted in the slot 121 or disassembled from the slot via the clasp 122, as shown in FIG. 13.
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Other structures are the same as that of Example 1.
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While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.
