CN103141314A

CN103141314A - Handheld branch shears

Info

Publication number: CN103141314A
Application number: CN201310062265XA
Authority: CN
Inventors: 卢毅; 肖炜; 代志君
Original assignee: NANJING JIUCHI ELECTROMECHANICAL INDUSTRY Co Ltd
Current assignee: NANJING JIUCHI ELECTROMECHANICAL INDUSTRY Co Ltd
Priority date: 2013-02-28
Filing date: 2013-02-28
Publication date: 2013-06-12
Anticipated expiration: 2033-02-28
Also published as: CN103141314B

Abstract

The invention relates to a pair of handheld branch shears and belongs to the technical field of electric tools. The pair of branch shears comprises a fixed knife and a moving knife, wherein a handle is extended from the moving knife in the direction towards the grab handle, and an expansion spring is arranged between the handle and the grab handle; a motor is mounted in the grab handle and has an output shaft connected with the moving knife; a transmission mechanism comprises a driving cone gear, a driven cone gear which is coaxial with the pin shaft of the moving knife and has a first and a second axial positions, a ratchet wheel which is coaxial with the pin shaft of the moving knife and is oppositely fixed with the moving knife, and a ratchet pawl which is mounted on the fixed knife and provided with a first and a second angular positions. According to the invention, the cutting of big and hard branches can be realized based on power, the moving knife can quickly move before and after shearing, the disadvantages in the prior art are overcame, and the branch shearing can be effectively and conveniently completed.

Description

A kind of Handheld pruning scissors

Technical field

The present invention relates to a kind of garden instrument, especially a kind of Handheld pruning scissors with power set belongs to technical field of tools.

Background technology

Using Handheld pruning scissors that the trees flowers and plants are repaired is the important process of garden management.Existing Handheld pruning scissors mainly is divided into manually and electronic two classes, and its basic structure is respectively application number 200980133207.3,201010268820.0 Chinese patent application is disclosed.Wherein the electric hand shrub and hedge trimmer comprise the ledger-plate that is fixed in fuselage, with respect to ledger-plate back and forth knife section, the drive part that is connected with knife section, gear-box and the motor of opening and closing.Compare with hand pruner, the advantage of electric shrub and hedge trimmer is can cut off by power drive manually to be difficult to the thicker branch sheared, but it is moving, the complete limited and drive unit of the speed of related movement of stationary knife, resetting rapidly after the quick-make before can't realizing shearing and shearing, therefore in use, limited efficiency, it is handy to be difficult to.

Summary of the invention

The object of the invention is to: for the shortcoming that above-mentioned prior art exists, proposes a kind ofly rely on power to shear thick and stiff branch and shear the Handheld pruning scissors that the front and back moving knife can rapid movement, thereby significantly improve operating efficiency.

In order to reach above purpose, Handheld pruning scissors of the present invention comprises and is positioned at lever one end and relatively-stationary stationary knife, and by the hinged moving knife in lever one end and stationary knife formation sheared edge of moving knife bearing pin, described moving knife extends handle towards the lever direction, is equipped with between described handle and lever and opens spring; Also comprise the motor that bat-handle switch is controlled, the output shaft of described motor is connected with moving knife by transmission mechanism; Described transmission mechanism comprises the rotating shaft active conical gear parallel with motor output shaft, coaxial and have a driven bevel gear of the first and second axial locations by clutch with the moving knife bearing pin, and with the moving knife bearing pin coaxial and with the relatively-stationary ratchet of moving knife, the ratchet with first and second angular position is installed on described stationary knife.

When described ratchet went to the first angular position, described ratchet was in and is limited towards enlarging sheared edge direction rotary state, and described driven bevel gear is in and the engagement of active conical gear and the primary importance that fits tightly with moving knife; When described ratchet went to the second angular position, described ratchet was in and is limited towards dwindling sheared edge direction rotary state, and described driven bevel gear is in the compressing of pressurized cover and breaks away from conical gear engagement initiatively and break away from the second place of fitting with moving knife.

Typical clutch comprises the gland that is contained on the moving knife bearing pin and forms with it screw pair, an end of described gland and the applying of described driven bevel gear end face, between described ratchet and described gland by being connected by meshing transmission.

Like this, when using shrub and hedge trimmer of the present invention to shear, make ratchet be in the first angular position, can rely on the kneading effect of palm to overcome the power that supports of opening spring, moving knife is rotated under handle drives, dwindle rapidly sheared edge, shear, when the thick and stiff branch resistance of shearing is larger, trigger bat-handle switch, can drive moving knife by transmission mechanism by the motor output torque and complete the shearing pruning.Shear complete, make ratchet be in the second angular position, due to the engagement of motor disengaging with moving knife, ratchet mechanism allows moving knife towards enlarging the rotation of sheared edge direction simultaneously, and this moment, driven bevel gear broke away from and the initiatively engagement of conical gear, so handle will open opening to reset rapidly under the spring effect.This shows, after adopting the present invention, can realize relying on power to shear thick and stiff branch, and shear forward and backward moving knife can rapid movement, therefore overcome the drawback that prior art exists, efficiently complete easily pruning.

The present invention further improves, the lever handle is equipped with in the described handle outside, be equipped with between described lever handle and handle and strut spring and bat-handle switch, the front end of described lever handle is connected with the ratchet transmission, and the described coefficient of elasticity of spring that struts is greater than the coefficient of elasticity of opening spring; When the rear end of described lever handle be in away from handle strut the position time, described ratchet is in the second angular position, described bat-handle switch is in the state of not being triggered; When the rear end of described lever handle be near handle draw close the position time, described ratchet is in the first angular position, described bat-handle switch is in the state of being triggered.

Like this, can need not to change under the prerequisite of gripping state by controlling the lever handle, one hand is realized the switching of detent positions, thereby the duty of corresponding change shrub and hedge trimmer makes its operation use more convenient.

Description of drawings

The present invention is further illustrated below in conjunction with accompanying drawing.

Fig. 1 is the perspective view after a preferred embodiment of the invention removes shell.

Fig. 2 is the structural representation that Fig. 1 embodiment shears rear state.

Fig. 3 is the end view of Fig. 2.

Fig. 4 is the structural representation that Fig. 1 embodiment shears front state.

Fig. 5 is the end view of Fig. 4.

Fig. 6 is the B-B cutaway view Amplified image of Fig. 2.

Fig. 7 is the B-B cutaway view Amplified image of Fig. 4.

Embodiment

Embodiment one

The Handheld pruning scissors of the present embodiment comprises being positioned at lever 1 one ends and relatively-stationary stationary knife 2, hinged at the moving knife 3 of lever one end with stationary knife 2 formation sheared edges by moving knife bearing pin 13 as shown in Fig. 1 (simultaneously referring to Fig. 2 to Fig. 7).One end of moving knife bearing pin 13 is spacing by end plate, and the other end is by cover cap 16, nut 17 axial limitings.Moving knife 3 extends handle 4 towards lever 1 direction, is equipped with between handle 4 and lever 1 and opens spring 5.Motor 7 and battery that bat-handle switch 6 is controlled are housed in lever 1.The output shaft of motor 7 is connected with moving knife 3 by reduction gearing mechanism 8.Transmission mechanism 8 comprises its rotating shaft active conical gear 9 parallel with motor 1 output shaft, coaxial and have the driven bevel gear 10 of the first and second axial locations with moving knife bearing pin 13, and with moving knife bearing pin 13 coaxial and with the relatively-stationary ratchet 11 of moving knife 3.The apparent surface of driven bevel gear 10 and moving knife 3 has respectively can intermeshing end-tooth (also can friction engagement etc. other be adjacent to engaging structure).Y shape ratchet 12 with first and second angular position is installed on stationary knife 2.The gland 14 that forms with it screw pair is housed on moving knife bearing pin 13, and an end of gland 14 and driven bevel gear 10 end faces are fitted, and are connected by meshing transmission by the finger 15 that stretches in the Y shape prong between Y shape ratchet 12 and gland 14.The lever handle 18 that three grades of connecting rods consist of is equipped with in handle 4 outsides, and the bat-handle switch 6 that struts spring 19 and control electric motor starting is housed between these lever handle 18 rear ends and handle 4.The front end of lever handle 18 has jag, and a pawl of Y shape ratchet 11 stretches in jag, consists of transmission and is connected.Strut the coefficient of elasticity of spring 19 greater than the coefficient of elasticity of opening spring 5.

During use, the actuating linkage handle makes ratchet be in Fig. 4, the first angular position shown in Figure 7, can rely on palm to overcome the power that supports of opening spring to the kneading effect of lever handle and handle, and moving knife is rotated under handle drives, dwindle rapidly sheared edge, directly carry out the shearing of soft branch; And when shearing thick and stiff branch, the sheared edge of dwindling meets obstructions when larger, and the lever handle overcomes the active force that struts spring and triggers bat-handle switch, makes the motor output torque.At this moment, because ratchet is in the first angular position shown in Figure 4, ratchet is in and is limited towards enlarging sheared edge direction rotary state, therefore sheared edge can only not dwindled and can be opened, and driven bevel gear is in and active conical gear engagement and the primary importance that fits tightly with moving knife, the engagement of its end-tooth and moving knife apparent surface's end-tooth, so the output torque of motor changes the strong shear action of moving knife very reliably into, the operator need not be required great effort can complete the pruning of thick and stiff branch.Shear completely, when unclamping the lever handle, bat-handle switch breaks away from the state that is triggered, the motor outage; The reset response that struts spring is pushed as Fig. 2, the second angular position shown in Figure 6 ratchet, the Y shape ratchet drives the gland rotation by finger, under the effect of screw pair, gland is along the precession of moving knife bearing pin, driven bevel gear is depressed into to break away from the engagement of active conical gear and with moving knife breaks away from the second place of fitting, simultaneously ratchet mechanism allows moving knife to rotate towards enlarging the sheared edge direction, so handle will open opening to reset rapidly under the spring effect.So move in circles, can realize that the rapid and convenient of thick and stiff branch is pruned.

Claims

1. Handheld pruning scissors, comprise and be positioned at lever one end and relatively-stationary stationary knife, and by the hinged moving knife in lever one end and stationary knife formation sheared edge of moving knife bearing pin, described moving knife extends handle towards the lever direction, is equipped with between described handle and lever and opens spring; It is characterized in that: also comprise the motor that bat-handle switch is controlled, the output shaft of described motor is connected with moving knife by transmission mechanism; Described transmission mechanism comprises the rotating shaft active conical gear parallel with motor output shaft, coaxial and have a driven bevel gear of the first and second axial locations by clutch with the moving knife bearing pin, and with the moving knife bearing pin coaxial and with the relatively-stationary ratchet of moving knife, the ratchet with first and second angular position is installed on described stationary knife.

2. Handheld pruning scissors according to claim 1, it is characterized in that: when described ratchet goes to the first angular position, described ratchet is in and is limited towards enlarging sheared edge direction rotary state, and described driven bevel gear is in and the engagement of active conical gear and the primary importance that fits tightly with moving knife; When described ratchet went to the second angular position, described ratchet was in and is limited towards dwindling sheared edge direction rotary state, and described driven bevel gear is in the compressing of pressurized cover and breaks away from conical gear engagement initiatively and break away from the second place of fitting with moving knife.

3. Handheld pruning scissors according to claim 1 and 2, it is characterized in that: described clutch comprises the gland that is contained on the moving knife bearing pin and forms with it screw pair, one end of described gland and described driven bevel gear end face are fitted, between described ratchet and described gland by being connected by meshing transmission.

4. Handheld pruning scissors according to claim 3, it is characterized in that: the lever handle is housed outside described handle, be equipped with between described lever handle and handle and strut spring and bat-handle switch, the front end of described lever handle is connected with the ratchet transmission, and the described coefficient of elasticity of spring that struts is greater than the coefficient of elasticity of opening spring; When the rear end of described lever handle be in away from handle strut the position time, described ratchet is in the second angular position, described bat-handle switch is in the state of not being triggered; When the rear end of described lever handle be near handle draw close the position time, described ratchet is in the first angular position, described bat-handle switch is in the state of being triggered.

5. Handheld pruning scissors according to claim 4, it is characterized in that: described ratchet is Y-shaped, and is connected by meshing transmission by the finger 15 that stretches in the Y shape prong between described gland.

6. Handheld pruning scissors according to claim 5, it is characterized in that: the apparent surface of described driven bevel gear and moving knife has respectively intermeshing end-tooth.

7. Handheld pruning scissors according to claim 6, it is characterized in that: described motor is arranged in lever.