KR100779515B1 - Carried pruning shears - Google Patents

Abstract

Portable pruning shears are provided to reduce the volume and weight of a cutting part by separating a driving part and the cutting part and transferring power to the cutting part through a power transfer part, and to control the stop of a rotary blade conveniently by using a first cam and a second cam to move a wire and a chain. Portable pruning shears comprise: (a) a driving part(20) which is equipped with a case(21), a battery, a motor, a gear, a first cam which moves circularly by the rotation of the gear, a second cam of which one end is hinged and the other end is contacted with the first cam, and which rotates at a fixed angle by the movement of the first cam, and a main switch; (b) a cutting part(30) which is equipped with a cutting body(31), a fixed blade(32) connected to the front of the cutting body, a rotary blade(33) capable of rotating at a fixed angle for the fixed blade, a restituting spring(34) moving the rotary blade elastically, a grip(35) connected to the rear of the cutting body, and a switch installed outside the grip; (c) a power transfer part(40) which is equipped with a wire(42) of which one end is connected to the end of the second cam and the other end is extended to the inner part of the grip, a chain(44) of which one end is connected to the end of the rotary blade and the other end is connected to the wire, and a sprocket(46) which is installed at the cutting body and connected to the chain; and (d) a shoulder strap part(50) which is combined with the driving part.

Description

Portable Pruning Shears {CARRIED PRUNING SHEARS}

1 is a perspective view showing a portable pruning shears according to the present invention;

Figure 2a and 2b is a schematic diagram showing the structure of the drive unit of the portable pruning shears according to the present invention,

3 is a schematic diagram showing the structure of a cut portion of the portable pruning shears according to the present invention;

Figure 4a and 4b is a driving and cutting unit operating state diagram of the portable pruning shears according to the present invention,

5A, 5B and 5C are diagrams illustrating an operation state of the first cam and the second cam of the portable pruning shears according to the present invention.

              <Description of Symbols for Main Parts of Drawings>

             20: drive unit 21: case

             22: battery 23: motor

             24: gear 25a: first cam

             25b: 2nd cam 26: main switch

             30: cut part 31: body

             32: fixed blade 33: rotary blade

             34: restoring spring 35: handle

             36: operation switch 37: safety cover

             40: power transmission unit 42: wire

             44: chain 46: sprocket

             50: suspenders 60: protective tube

The present invention relates to portable pruning shears, and more particularly, to portable pruning shears that can be easily carried and relatively improved workability.

In general, in the landscaping or forestry fields, cutting means such as pruning shears or chainsaws are used when pruning various types of crops, lost or ornamental water.

When pruning manually using such cutting means takes a lot of work time and of course the work is difficult, there is a problem that the efficiency of the work is lowered.

Recently, various kinds of automatic pruning shears have been introduced to solve the above problems.

Conventional automatic pruning shears; A motor connected to the rear of the support and operated by receiving external power; A fixed blade connected to the front upper portion of the support via a fixing bracket; A movable blade rotatably combined with a pin structure on the fixed blade side; A rotating disc rotatably mounted on an upper portion of the pedestal; One end is connected to one side of the edge of the rotary disk, the other end of the operation rod is connected to the rear of the movable blade; A gear transmission connected to the rear of the pedestal to transfer the power of the motor to the rotating disc; A handle having a switch to turn on / off the motor.

Since such automatic pruning shears are disclosed in Korean Utility Model Publication No. 20-0416812, detailed description thereof will be omitted.

However, the automatic pruning shears as described above have a relatively large volume and a heavy weight, which makes it difficult to work for a long time and has a disadvantage in that the efficiency of the work is reduced. That is, since all the driving parts for driving the movable blades such as the motor and the gear transmission are accommodated inside the case, not only the volume of the automatic pruning shear is increased but also the weight is heavy, thereby reducing work efficiency.

In addition, there is a disadvantage that a separate battery for supplying power to the automatic pruning shears is required.

This, in turn, results in a decrease in the functionality and usability of the automatic pruning shears.

And the automatic pruning shears as described above have a problem that it is difficult to control the driving unit by the on / off operation of the switch. In particular, if you want to stop the operation of the automatic shears, the switch must be turned off correctly at the appropriate time, but it is difficult to precisely control the timing by the continuous cutting and restoration of the automatic shears.

The present invention has been made to solve the above problems, and an object thereof is to provide a portable pruning shear that can improve workability as well as portability.

In order to achieve the above object, the present invention provides a battery, a motor electrically connected to the battery, a gear rotated by the motor, a first cam circularly moved by the rotation of the gear, one end of which is hinged and the other end. The second cam is in contact with the first cam is rotated (swinged) at a predetermined angle by the flow of the first cam, the main switch for supplying / blocking power to the motor, the battery and the motor, the gear and the A driving part including a case in which a first cam, the second cam, and the main switch are accommodated; Body, a fixed blade coupled to the front of the body, a rotary blade rotatably coupled at a predetermined angle with respect to the fixed blade, is installed in connection with the rotary blade restoring spring to elastically move the rotary blade, the body Handle is coupled to the rear of the cutting portion is provided with an operating switch installed on the outside of the handle; One end is connected to the end of the second cam and the other end is a wire extending through the case to the inside of the handle, one end is coupled to the end of the rotary blade and the other end is a chain connected to the wire, installed on the body A force transmission unit having a sprocket coupled to the chain; It has a technical feature to comprise a suspenders coupled to the drive.

The second cam rotates the rotary blade in the first rotating section of the first cam, performs the restoring operation by the restoring spring in the second rotating section, and restores the restored state in the third rotating section for a predetermined time. It is desirable to have a specific shape that can be maintained.

The portion exposed to the outside of the wire is preferably embedded in a protective tube.

Preferably, the handle is provided with a safety cover that can selectively cover the operation switch.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in Figures 1 to 3, the portable pruning shears according to the present invention includes a drive unit 20 for providing a driving force; A cutting unit 30 operated by the driving unit 20; A force transmission unit 40 connected to the driving unit 20 and the cutting unit 30 to transfer the driving force of the driving unit 20 to the cutting unit 30 to operate the cutting unit 30; It comprises a suspenders 50 coupled to the drive unit 20.

The driving unit 20 includes a case 21; A battery 22 provided inside the case 21; A motor 23 provided inside the case 21 and electrically connected to the battery 22; A gear 24 provided inside the case 21 and rotated by the motor 23; A first cam 25a provided inside the case 21 and coupled to the front of the gear 24 to move in a circular motion by the rotation of the gear 24; A second cam 25b having one end hinged and the other end maintained in contact with the first cam 25a; The main switch 26 is installed to be exposed to the outside of the case 21.

The case 21 includes a base portion 21a having a square plate shape having a predetermined size; One side coupled to the base portion 22 includes a cover 21b of a rectangular box shape open.

The base portion 21a and the cover portion 21b are preferably made of a material having excellent physical properties such as durability and strength resistance, and the cover portion 21b is attached to the base portion 21a by a known coupling means such as a screw or the like. It has a structure that is detachably coupled.

As well as the structure of the case 21, its size and shape can be variously changed as necessary.

The battery 22 has a charger connection cord 27 is mounted, there is an advantage that can easily charge the battery 22 from the outside by using the charger connection cord 27.

The battery 22 has a constant power supply capacity and maintains a state in which the battery 22 is firmly and stably supported inside the case 21 by the at least one support bracket 29a.

The battery 22 may be selectively applied to various kinds of known ones.

The motor 23 is a means for providing rotational force, and the gear 24 is coupled to be rotated by the motor 23.

A reducer 28 is provided between the motor 23 and the gear 24 to adjust the rotational speed. The reducer 28 and the gear 24 are attached to the support plate 29b installed in the case 21. Is supported by.

The gear 24 includes a first gear 24a connected to the speed reducer 28; And a second gear 24b engaged with the first gear 24a and interlocked by the rotation of the first gear 24a. The rotation speed of the first gear 24a and the second gear 24b can be appropriately adjusted as necessary.

The structure of the gear 24 can be changed as appropriate within the range in which the first cam 25a can be easily rotated.

The first cam 25a is rotated in conjunction with the gear 24, and the second cam 25b is rotated at an angle by the flow of the first cam 25a to reciprocate the wire 42. Do this.

The second cam 25b has a specific shape to control its rotation (swing) state according to the rotation angle of the first cam 25a, and has a phone shape in the present invention. The shape of the second cam 25b can be appropriately changed within a range capable of performing the same function.

Due to the structural features of the first cam 25a and the second cam 25b, the state of the second cam 25b is maintained in the restored state for a predetermined time, so that the operation switch 36 is easily turned off. have. Details thereof will be described later with reference to FIGS. 5A to 5C.

The main switch 26 serves to supply / block power to the motor 23 by a switching operation.

On the other hand, the arrangement of the battery 22, the motor 23, the gear 24, the rotary cam 25 and the main switch 26 accommodated in the case 21 can be changed as necessary.

Cutting portion 30 is a body 31; A fixed blade 32 coupled to the front of the body 31; A rotary blade 33 rotatably coupled at an angle with respect to the fixed blade 32; Restoring spring 34 is connected to the rotary blade 33 is installed; A handle 35 coupled to the rear of the body 31; It includes an operation switch 36 installed on the outside of the handle 35.

The fixed blade 32 and the rotary blade 33 are titanium coated to improve durability and cutting force.

The rotary blade 33 is hinged by the hinge pin 39, by being selectively engaged with the fixed blade 32 by the rotation operation it is possible to provide a constant cutting force.

Rotary blade 33 has a structure bent at a predetermined angle around the hinge pin (39).

Restoration spring 34 serves to make the rotary blade 33 elastically flowable. That is, by maintaining the rotary blade 33 in the elastic state to prevent the arbitrary flow of the rotary blade 33 and to return the rotary blade 33 to the original state after the cutting process is finished.

A predetermined space portion through which the wire 42 can penetrate is formed inside the handle 35, and an operation switch 36 installed at an outside thereof acts to operate the motor 23 by pressing.

The operation switch 36 is electrically connected to the main switch 26 of the drive unit 20 by the cable 36a, and the motor 23 is selectively driven by the on / off operation of the operation switch 36.

And the handle 35 is provided with a safety cover 37 of the opening and closing structure to selectively cover the operation switch 36, the structure of the safety cover 37 can be variously changed as necessary.

Force transmission portion 40 is one end is coupled to the end of the second cam (25b), the other end is a wire 42 extending through the case 21 to the inside of the handle 35; One end is coupled to the end of the rotary blade 33, the other end is a chain 44 of a predetermined length connected to the wire 42; It is installed on the body 31, and includes a sprocket 46 coupled to the chain 44.

The force transmission part 40 has the second cam 25b maintaining a state in contact with the first cam 25a at a predetermined angle as the first cam 25a flows due to the rotation of the gear 24. By rotating (swinging) the rotary blade 33 is selectively engaged with the fixed blade 32 it is possible to provide a constant cutting force.

The wire 42 may be selectively applied to various materials having excellent durability and strength.

Chain 44 is to increase the durability and strength to stably pull the rotary blade 33 is elastically flowing, the sprocket 46 serves to guide the chain 46 stably.

Both ends of the wire 42 are received and coupled to the inside of the driving unit 20 and the cutting unit 30, the central area is exposed to the outside. And the portion exposed to the outside of the wire 42 is embedded in the protection tube 60 to be protected from the external environment.

On the other hand, the protective tube 60 is also embedded with a cable 36a of the operation switch 36 in addition to the wire 42.

If necessary, the wire 42 and the cable 36a may be bundled together using a separate tie without the wire 42 and the cable 36a embedded in the protective tube 60.

The wire 42 is connected to the second cam 25a by a wire connector 29c, and the driving unit 20 and the operating unit 30 are stably maintained in the installation state of the wire 42 and the chain 44. Cable support brackets 29d and 38 are provided respectively.

The suspenders 50 are intended to facilitate the carrying of the drive unit 20, and the structure of the suspenders 50 can be appropriately changed within a range that can be efficiently carried over the shoulder of the user for long-term efficient operation.

The operational state of the above-described portable pruning shears will be described below with reference to FIGS. 4A and 4B.

First, when the portable pruning shears are not used, as shown in FIG. 4A, the rotary blade 33 coupled to the body 31 is kept spaced apart from the fixed blade 32.

At this time, the rotary blade 33 is elastically supported by the restoring spring 34 to prevent arbitrary flow.

In the case of using portable pruning shears, as shown in FIG. 4B, the motor 23 and the first gear 24a are turned on by turning on the operation switch 36 installed on the outside of the handle 35. And as the second cam 24b is driven and the first cam 25a coupled to the second gear 24b moves in a circular motion, the second cam 25b is interlocked with the wire 42 and the chain. The 44 is reciprocated so that the rotary blade 33 is engaged with the fixed blade 32 to provide cutting force.

5A, 5B and 5C are diagrams illustrating an operation state of the first cam and the second cam of the portable pruning shears according to the present invention.

FIG. 5A shows the flow state of the second cam 25b in the first rotation section of the first cam 25a. The first gear 24a is turned on by turning on the operation switch 36 (see FIG. 3). And the second gear 24b is rotated and at the same time as the first cam 25a is rotated along the first rotation section, the second cam 25b in contact with the first cam 25a is interlocked with the rotary blade ( 33, see Fig. 3).

As such, the cutting operation is performed between about 127 to 287 °, which is the first rotation section of the first cam 25a.

FIG. 5B shows the flow state of the second cam 25b in the second rotation section of the first cam 25a, and the first cam is rotated by the first gear 24a and the second gear 24b. When 25a passes through the first rotation section (about 127-287 °), the restoring operation of the second cam 25b is performed by the restoring force of the restoring spring 34 (see Fig. 3).

That is, the restoring operation of the second cam 25b by the restoring spring 34 (see FIG. 3) is performed between about 287 ° to 17 °, which is the second rotation section of the first cam 25a.

FIG. 5C shows the flow state of the second cam 25b in the third rotation section of the first cam 25a. The first cam 24a and the second gear 24b are rotated to rotate the first cam 25a. When 25a passes through the second rotation section (about 287 to 17 °) and reaches the third rotation section (about 177 to 127 °), the second cam 25b maintains the restored state.

That is, between about 177 ° to 127 °, the third rotation section of the first cam 25a, the second cam 25b is temporarily maintained.

As such, according to the present invention, the cutting and restoring operations of the portable pruning shears are not continuously performed, and the second cam 25b linked by the first cam 25a has a third rotation section (about 177 to 127 °). ) Is a technical feature to maintain the restored state for a certain time.

Therefore, the user can accurately control the stopping operation of the rotary blade 33 (see Fig. 3) by turning off the operation switch 36 (see Fig. 3) in the third rotation section (about 177 to 127 °).

As described above, according to the present invention, the volume and weight of the cut portion can be reduced by transmitting a force through the force transmission portion in a state where the driving portion and the cut portion are separated.

Therefore, the workability can be improved as well as the functionality and usability of the portable pruning shears.

And through the suspenders can be easily carried out in the state of bearing the drive on the shoulder.

In addition, by using the first cam and the second cam to flow the wire and chain it is possible to easily and efficiently control the stopping operation of the rotary blade by the operation switch off.

Claims (3)

A battery, a motor electrically connected to the battery, a gear rotated by the motor, a first cam circularly moved by the rotation of the gear, one end of which is hinged, and the other end of the first cam contacts the first cam. A second cam rotated at a predetermined angle by a flow of the main cam, the main switch supplying / blocking power to the motor, the battery, the motor, the gear, the first cam, the second cam, and the main switch are accommodated therein. A driving unit provided with a case; Body, a fixed blade coupled to the front of the body, a rotary blade rotatably coupled at a predetermined angle with respect to the fixed blade, is installed in connection with the rotary blade restoring spring to elastically move the rotary blade, the body Handle is coupled to the rear of the cutting portion is provided with an operating switch installed on the outside of the handle; One end is connected to the end of the second cam and the other end is a wire extending through the case to the inside of the handle, one end is coupled to the end of the rotary blade and the other end is a chain connected to the wire, installed on the body A force transmission unit having a sprocket coupled to the chain; Including the suspenders coupled to the drive unit, The second cam rotates the rotary blade in the first rotating section of the first cam, performs the restoring operation by the restoring spring in the second rotating section, and restores the restored state in the third rotating section for a predetermined time. Portable pruning shears, characterized in that the holding. The method of claim 1, Portable pruning shears, characterized in that the portion exposed to the outside of the wire is embedded in a protective tube. The method according to claim 1 or 2, Portable handles, characterized in that the handle is installed on the handle to cover the operation switch selectively.

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