CN108848998B

CN108848998B - Labor-saving garden shears

Info

Publication number: CN108848998B
Application number: CN201810713917.4A
Authority: CN
Inventors: 李峥炜
Original assignee: Fujian Tuoqing Agricultural Development Co Ltd
Current assignee: Fujian Tuoqing Agricultural Development Co Ltd
Priority date: 2018-07-03
Filing date: 2018-07-03
Publication date: 2020-11-10
Anticipated expiration: 2038-07-03
Also published as: CN108848998A

Abstract

The invention provides a labor-saving garden shear, which comprises two mutually hinged shear halves; each scissor half part comprises a cutter head and a knife handle; the upper part of each knife handle is respectively provided with a shaft hole parallel to the rotating shaft of the scissors; a torsion spring with the axis parallel to the rotating shaft of the scissors is arranged between the two tool handles, and two support arms of the torsion spring are arranged in the two shaft holes; the two support arms are composed of telescopic rods; the space between the two support arms and the scissors rotating shaft is also provided with two swing arms, the front ends of the swing arms are respectively hinged to the shaft holes, so that the swing arms can swing around the shaft holes, the rear ends of the two swing arms are hinged to each other to form swing arm hinges, and a support rod is further connected between the swing arm hinges and the torsion spring. The labor-saving garden shears have obvious elastic restoring force under the condition that the opening angle of the cutter head is large, and only have relatively low elastic restoring force under the condition that the opening angle is small.

Description

Labor-saving garden shears

Technical Field

The invention relates to the field of garden tools, in particular to a pair of garden shears.

Background

In the landscaping maintenance process, pruning branches by using garden shears is often needed; because the handle of a knife of the garden shears is thick, so the annular handle of a knife of ordinary shears can not be made, the handle of a knife can not be opened by depending on the back of a hand holding the handle of a knife, and a return spring needs to be arranged between the two handles of the knife, so that the handle of a knife can be automatically outwards unfolded by the return spring after the one-time shearing is completed and the knife head and the handle of a knife are folded.

However, the spring that present gardens were cut and is adopted mainly has compression spring and torsion spring, and no matter which kind of spring, its elastic restoring force is always in inverse proportion with the opening angle of tool bit, in order to ensure under the great condition of tool bit opening angle, also have obvious restoring force, just must make under the less condition of tool bit opening angle, huge restoring force has, like this, at every shearing in-process, especially, the latter half of shearing, the user all need overcome very big spring restoring force, make the operation process comparatively labourious, waste physical power in a large number.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a pair of labor-saving garden shears, which has a significant elastic restoring force when the opening angle of the cutting head is large, and has a relatively low elastic restoring force when the opening angle is small.

The technical scheme adopted by the invention for solving the technical problems is as follows: the labor-saving garden shears comprise two mutually hinged shear halves; each scissor half part comprises a cutter head and a knife handle; the upper part of each knife handle is respectively provided with a shaft hole parallel to the rotating shaft of the scissors; a torsion spring with the axis parallel to the rotating shaft of the scissors is arranged between the two tool handles, and two support arms of the torsion spring are arranged in the two shaft holes; the two support arms are composed of telescopic rods; the space between the two support arms and the scissors rotating shaft is also provided with two swing arms, the front ends of the swing arms are respectively hinged to the shaft holes, so that the swing arms can swing around the shaft holes, the rear ends of the two swing arms are hinged to each other to form swing arm hinges, and a support rod is further connected between the swing arm hinges and the torsion spring.

Preferably, the distance between each shaft hole and the rotating shaft of the scissors is equal, the length of the two swing arms is equal, and the two support arms are the same; therefore, three points of the center of the torsion spring, the center of the hinged joint of the swing arm and the center of the rotating shaft of the scissors are collinear to form a symmetrical line of the scissors, and the two support arms and the two swing arms are symmetrical with respect to the symmetrical line of the scissors all the time, so that the support arms and the swing arms are uniformly stressed, and the service life of the whole mechanical system is prolonged.

Preferably, the support rod is composed of an elastic rod capable of axially deforming, and specifically, the support rod is composed of an elastic rod with a compression spring at the middle section and straight rods at two ends; therefore, when the knife handle is just folded, the elastic rod can be axially compressed slightly and loosely, so the support arm is extended slowly, the elastic restoring force of the torsion spring is increased rapidly along with the folding of the knife handle, and in the later period of the folding of the knife handle, the elastic rod is difficult to axially compress, so that the support arm is extended rapidly along with the folding of the knife handle, and the elastic restoring force of the torsion spring is increased slowly along with the folding of the knife handle, so that the elastic restoring force is larger when the opening angle of the knife handle is larger, and the elastic restoring force is smaller when the opening angle of the knife handle is smaller, namely, the range of the elastic restoring force is further reduced, and the garden shears keep a stable restoring force all the time.

Preferably, the support rod is an adjustable telescopic rod capable of adjusting the axial length, for example, the support rod comprises a screw rod and a sleeve sleeved with the screw rod, the inner diameter of the sleeve is equal to the outer diameter of the screw thread of the screw rod, the connecting end of the sleeve is provided with a rotary threaded joint capable of freely rotating around the axis of the sleeve, and the length of the screw rod extending into the sleeve is changed by screwing the rotary threaded joint so as to adjust the length of the whole support rod; therefore, when the overall elastic restoring force of the garden shears needs to be larger according to personal strength and use habits, the supporting rod is shortened to enable the supporting arm to be as short as possible, and when the overall elastic restoring force of the garden shears needs to be smaller, the supporting rod is lengthened to enable the supporting arm to be as long as possible.

The invention has the beneficial effects that: this laborsaving gardens are cut when cuting the branch, fold gradually along with the handle of a knife, two the field angle of swing arm diminish gradually, the swing arm with the field angle crescent of bracing piece can know according to the cosine theorem, two the length of support arm is elongated gradually, from this, the handle of a knife is right torsion spring's the compression arm of force crescent for torsion spring is extremely slow to the elastic restoring force growth rate of handle of a knife, thereby limits the restriction of the biggest elastic restoring force at lower level, thereby saves a large amount of strength of power industry personnel for overcoming the elastic restoring force and consume.

Drawings

Fig. 1 is a schematic view of a first embodiment of the power-saving garden shears.

Fig. 2 is a schematic view of a support rod in the second embodiment of the power saving garden shears.

Fig. 3 is a schematic view of a support rod in a third embodiment of the power-saving garden shears.

Detailed Description

The first embodiment is as follows:

in the first embodiment shown in fig. 1, the power-saving garden shears comprise two mutually hinged shear halves; each scissor half comprises a cutter head 11a, 11b and a

cutter handle

12a, 12 b; the upper parts of the

knife handles

12a and 12b are respectively provided with a shaft hole 13a and a shaft hole 13b which are parallel to the scissors rotating shaft 10, namely, the upper part of the knife handle 12a is provided with a shaft hole 13a, and the upper part of the knife handle 12b is provided with a shaft hole 13 b; a torsion spring 14 with the axis parallel to the scissors rotating shaft 10 is arranged between the two

knife handles

12a and 12b, and two support

arms

14a and 14b of the torsion spring 14 are erected in the two shaft holes 13a and 13 b; the two

support arms

14a and 14b are telescopic rods; two swing arms 15a and 15b are further arranged in the space between the two support

arms

14a and 14b and the scissors rotating shaft 10, the front ends of the swing arms 15a and 15b are respectively hinged to one shaft hole, so that the swing arm 15a can swing around the shaft hole 13a, the swing arm 15b can swing around the shaft hole 13b, the rear ends of the two swing arms 15a and 15b are hinged to each other to form a swing arm hinge joint 16, and a support rod 17 is further connected between the swing arm hinge joint 16 and the torsion spring 14.

In addition, the distances between the shaft holes 13a and 13b and the scissors rotating shaft 10 are equal, the lengths of the two swing arms 15a and 15b are equal, and the lengths of the two support

arms

14a and 14b are equal; therefore, three points of the center of the torsion spring 14, the center of the swing arm hinge joint 16 and the center of the scissors rotating shaft 10 are collinear to form a scissors symmetry line, and the two support

arms

14a and 14b and the two swing arms 15a and 15b are always symmetrical about the scissors symmetry line, so that the

support arms

14a and 14b and the swing arms 15a and 15b are uniformly stressed, and the service life of the whole mechanical system is prolonged.

When the labor-saving garden shears shear branches, the opening angles of the two swing arms 15a and 15b are gradually reduced along with the gradual folding of the knife handles 12a and 12b, the opening angles of the swing arms 15a and 15b and the supporting rod 17 are gradually increased, and the lengths of the two supporting

arms

14a and 14b are gradually lengthened according to the cosine law, so that the compression force arm of the knife handle for the torsion spring 14 is gradually increased, the increasing speed of the torsion spring 14 for the elastic restoring force of the

knife handles

12a and 12b is extremely slow, the maximum elastic restoring force is limited at a lower level, and a large amount of force consumed by force workers for overcoming the elastic restoring force is saved.

Example two:

for the second embodiment of the labor-saving garden shears, the difference with the first embodiment is that the support rod. As shown in fig. 2, in the second embodiment, the supporting rod 17 is an adjustable telescopic rod capable of adjusting the axial length, and specifically includes a screw 171 and a sleeve 172 sleeved with the screw 171, the inner diameter of the sleeve 172 is equal to the outer diameter of the screw thread of the screw 171, the connecting end of the sleeve 172 is provided with a rotary threaded joint 173 capable of freely rotating around the sleeve axis, and by screwing the rotary threaded joint 173, the length of the screw 171 extending into the sleeve 172 is changed, so as to adjust the length of the whole supporting rod 17; therefore, according to personal strength and use habits, when the overall elastic restoring force of the garden shears needs to be made larger, the supporting rod 17 is adjusted to be shorter so as to make the supporting

arms

14a and 14b as short as possible, and when the overall elastic restoring force of the garden shears needs to be made smaller, the supporting rod 17 is adjusted to be longer so as to make the supporting

arms

14a and 14b as long as possible.

Example three:

for the third embodiment of the labor-saving garden shears, the difference with the first embodiment is also the support rod 17. As shown in fig. 3, in the third embodiment, the support rod 17 is formed by an elastic rod capable of axially deforming, and specifically, may be formed by an elastic rod having a compression spring 174 at the middle section and straight rods 175a and 175b at the two ends; thus, as soon as the

shanks

12a, 12b begin to close, the spring rod is compressed axially, with less looseness, so that the

legs

14a, 14b are extended slowly, so that the spring return force of the torsion spring 14 increases more rapidly as the

shanks

12a, 12b close, and at the later stage of the closing of the

shanks

12a, 12b, the resilient bar is difficult to compress axially, so that the

arms

14a, 14b will expand rapidly as the

shanks

12a, 12b are closed, the elastic restoring force of the torsion spring 14 increases slowly as the

tool shanks

12a and 12b are closed, therefore, when the opening angles of the tool handles 12a and 12b are larger, the elastic restoring force is larger, and when the opening angles of the tool handles 12a and 12b are smaller, the elastic restoring force is smaller, namely, the range of the elastic restoring force is further reduced, and the garden shears always keep a stable restoring force.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A labor-saving garden shears comprises two mutually hinged shear halves; each scissors half part comprises a cutter head (11 a, 11 b) and a cutter handle (12 a, 12 b); the upper parts of the knife handles (12 a, 12 b) are respectively provided with a shaft hole (13 a, 13 b) parallel to the rotating shaft (10) of the scissors; a torsion spring (14) with the axis parallel to the rotating shaft of the scissors is arranged between the two knife handles (12 a, 12 b), and two support arms (14 a, 14 b) of the torsion spring (14) are erected in the two shaft holes (13 a, 13 b); the method is characterized in that: the two support arms (14 a, 14 b) are composed of telescopic rods; two swing arms (15 a, 15 b) are further arranged in the space between the two support arms (14 a, 14 b) and the scissors rotating shaft (10), the front ends of the swing arms are hinged to the shaft holes respectively, the swing arms (15 a, 15 b) can swing around the shaft holes (13 a, 13 b), the rear ends of the two swing arms (15 a, 15 b) are hinged to each other to form a swing arm hinge joint (16), and a support rod (17) is further connected between the swing arm hinge joint (16) and the torsion spring (14).

2. The labor-saving garden shears according to claim 1, wherein: the distances between the shaft holes (13 a, 13 b) and the scissors rotating shaft (10) are equal, the lengths of the two swing arms (15 a, 15 b) are equal, and the two support arms (14 a, 14 b) are equal.

3. The labor-saving garden shears according to claim 1, wherein: the supporting rod (17) is composed of an elastic rod capable of axially deforming.

4. The labor-saving garden shears according to claim 3, wherein: the support rod (17) is composed of an elastic rod, the middle section of the elastic rod is a pressure spring (174), and the two ends of the elastic rod are straight rods (175 a and 175 b).

5. The labor-saving garden shears according to claim 1, wherein: the supporting rod (17) is an adjustable telescopic rod with adjustable axial length.

6. The labor-saving garden shears according to claim 5, wherein: the supporting rod (17) comprises a screw rod (171) and a sleeve (172) sleeved with the screw rod, the inner diameter of the sleeve (172) is equal to the outer diameter of a thread of the screw rod (171), a rotary threaded joint (173) capable of freely rotating around the axis of the sleeve is arranged at the connecting end of the sleeve (172), and the length of the screw rod (171) extending into the sleeve (172) is changed by screwing the rotary threaded joint (173) so as to adjust the length of the whole supporting rod (17).