GB2499407A - Shears with toothed engagement - Google Patents

Shears with toothed engagement Download PDF

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Publication number
GB2499407A
GB2499407A GB1202553.2A GB201202553A GB2499407A GB 2499407 A GB2499407 A GB 2499407A GB 201202553 A GB201202553 A GB 201202553A GB 2499407 A GB2499407 A GB 2499407A
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GB
United Kingdom
Prior art keywords
cutter
driving arm
hole
pivot
cutting portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1202553.2A
Other versions
GB201202553D0 (en
Inventor
Yao-Chuang Huang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ho Cheng Garden Tools Co Ltd
Original Assignee
Ho Cheng Garden Tools Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ho Cheng Garden Tools Co Ltd filed Critical Ho Cheng Garden Tools Co Ltd
Priority to GB1202553.2A priority Critical patent/GB2499407A/en
Publication of GB201202553D0 publication Critical patent/GB201202553D0/en
Publication of GB2499407A publication Critical patent/GB2499407A/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/02—Secateurs; Flower or fruit shears
    • A01G3/025—Secateurs; Flower or fruit shears having elongated or extended handles
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/02—Secateurs; Flower or fruit shears
    • A01G3/025—Secateurs; Flower or fruit shears having elongated or extended handles
    • A01G3/0251—Loppers, i.e. branch cutters with two handles
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/02—Secateurs; Flower or fruit shears
    • A01G3/025—Secateurs; Flower or fruit shears having elongated or extended handles
    • A01G3/0255—Tree pruners, i.e. pruning shears carried at the end of a pole
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/02—Secateurs; Flower or fruit shears
    • A01G3/021—Secateurs; Flower or fruit shears characterized by the arrangement of pivots

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Environmental Sciences (AREA)
  • Scissors And Nippers (AREA)
  • Shearing Machines (AREA)

Abstract

A pair of shears include a first cutter 10, a second cutter 20 pivotally connected with the first cutter, a driving arm 30 pivotally connected with the first cutter and engaging the second cutter, and a limit plate 50 abutting the second cutter and the driving arm. The second cutter has a first toothed rack 24. The driving arm has a second toothed rack 33 meshing with the first toothed rack of the second cutter. The limit plate having a slot 52 which is connected to a through hole 25 on the second cutter by pivot set 60d. The second cutter is pivotally connected with the first cutter by pivot set 60a, and the driving arm is pivotally connected with the first cutter by pivot set 60b so that the second cutter and the driving arm are connected with the first cutter respectively to evenly distribute a shearing force applied on the shears.

Description

SHEARS WITH TOOTHED ENGAGEMENT The present invention relates to a shearing tool and, more particularly, to a pair of shears for a gardening purpose.
A gardening tool, such as a pruning hook, is used to shear branches of 5 a tree at a higher location. A conventional pruning hook in accordance with the prior art shown in FIGS. 13 and 14 comprises a first cutter 70 having a first end provided with a support base 72 and a second end provided with a mounting seat 71, a second cutter 80 pivotally connected with the support base 72 of the first cutter 70, a driving arm 90 pivotally connected with the second cutter 80 10 and engaging the support base 72 of the first cutter 70 to drive and move the second cutter 80 relative to the first cutter 70, an elastic member 76 biased between the support base 72 of the first cutter 70 and the driving arm 90, a pulley set 94 pivotally connected with the driving arm 90, and an operation cord 95 mounted between the pulley set 94 and the mounting seat 71 of the first 15 cutter 70. The support base 72 of the first cutter 70 has a first side provided with a first cutting portion 74 and a second side provided with a first toothed portion 75. The support base 72 of the first cutter 70 has a mediate portion provided with a through hole 73 disposed between the first cutting portion 74 and the first toothed portion 75. The second cutter 80 has a first end provided 20 with a second cutting portion 82 movable relative to the first cutting portion 74 of the first cutter 70 and a second end provided with a connecting portion 83 pivotally connected with the driving arm 90. The connecting portion 83 of the
second cutter 80 has a distal end provided with a first pivot hole 84. The second cutter 80 has a mediate portion provided with a pivot hole 81 pivotally connected with the through hole 73 of the first cutter 70. The driving arm 90 has a first end provided with a second toothed portion 91 meshing with the first 5 toothed portion 75 of the first cutter 70 and a second end provided with an extension 93 which is connected with the elastic member 76 and the pulley set 94. The driving arm 90 has a mediate portion provided with a second pivot hole 92 pivotally connected with the first pivot hole 84 of the second cutter 80.
In operation, when the operation cord 95 is pulled by a user, the 10 driving arm 90 is pivoted downward relative to the first cutter 70 to extend the elastic member 76 and to drive the second cutter 80 so that the second cutter 80 is pivoted relative to the first cutter 70, and the second cutting portion 82 of the second cutter 80 is moved toward the first cutting portion 74 of the first cutter 70 so as to perform a shearing action. At the same time, the second toothed 15 portion 91 of the driving arm 90 meshes with the first toothed portion 75 of the first cutter 70 so that the second cutter 80 is driven by the driving arm 90 smoothly and stably.
However, when the second cutting portion 82 of the second cutter 80 and the first cutting portion 74 of the first cutter 70 are subjected to a larger 20 shearing force (or torque) during the cutting process, the shearing force is directly transmitted to the engaging portion of the driving arm 90 and the first cutter 70 so that the second toothed portion 91 of the driving arm 90 easily
produces deviation or deflection and cannot meshes with the first toothed portion 75 of the first cutter 70 exactly, thereby greatly affecting operation of the second cutter 80 and the driving arm 90.
In accordance with the present invention, there is provided a pair of 5 shears, comprising a first cutter, a second cutter pivotally connected with the first cutter, a driving arm pivotally connected with the first cutter and engaging the second cutter, and a limit plate abutting the second cutter and the driving arm. The first cutter has a first end provided with a first shaft hole, a second shaft hole and a first cutting portion. The second cutter has a first end provided 10 with a second cutting portion and a second end provided with an extension. The extension of the second cutter has an end provided with a first toothed rack. The first toothed rack of the second cutter has a side provided with a first through hole. The second cutter has a mediate portion provided with a first pivot hole pivotally connected with the first shaft hole of the first cutter by a 15 first pivot set. The driving arm has a first end provided with a connecting portion. The connecting portion of the driving arm has a side provided with a second toothed rack meshing with the first toothed rack of the second cutter. The connecting portion of the driving arm has a surface provided with a second pivot hole and a second through hole. The second pivot hole of the driving arm 20 is pivotally connected with the second shaft hole of the first cutter by a second pivot set. The limit plate has a first end provided with a limit hole and a second end provided with an elongate limit slot. The limit hole of the limit plate is
pivotally connected with the second through hole of the driving arm by a third pivot set. The limit slot of the limit plate is pivotally connected with the first through hole of the second cutter by a fourth pivot set.
According to the primary advantage of the present invention, the first 5 pivot hole of the second cutter is pivotally connected with the first shaft hole of the first cutter by the first pivot set, and the second pivot hole of the driving arm is pivotally connected with the second shaft hole of the first cutter by the second pivot set so that the second cutter and the driving arm are connected with the first cutter respectively to evenly distribute an external shearing force 10 applied on the shears during the cutting process so as to prevent the first pivot set and the second pivot set from being distorted or deformed due to a stress concentration.
According to another advantage of the present invention, the external shearing force applied on the shears is shared by the second cutter and the 15 driving arm without incurring a stress concentration so that the second toothed rack of the driving arm meshes with the first toothed rack of the second cutter closely and exactly, and the second cutter and the driving arm are linked and operated smoothly and stably.
Further benefits and advantages of the present invention will become 20 apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
In the drawings:
FIG. 1 is a perspective view of a pair of shears in accordance with the preferred embodiment of the present invention.
FIG. 2 is another perspective view of the shears as shown in FIG. 1. FIG. 3 is an exploded perspective view of the shears as shown in FIG.
1.
FIG. 4 is a front view of the shears as shown in FIG. 1.
FIG. 5 is a front view of the shears as shown in FIG. 1.
FIG. 6 is a schematic operational view of the shears as shown in FIG.
5.
FIG. 7 is a schematic operational view of the shears as shown in FIG.
6.
FIG. 8 is a perspective view of a pair of shears in accordance with another preferred embodiment of the present invention.
FIG. 9 is an exploded perspective view of the shears as shown in FIG.
8.
FIG. 10 is a front view of the shears as shown in FIG. 8.
FIG. 11 is a schematic operational view of the shears as shown in FIG.
10.
FIG. 12 is a perspective view of a pair of shears in accordance with another preferred embodiment of the present invention.
FIG. 13 is a front view of a pair of conventional shears in accordance with the prior art.
FIG. 14 is a schematic operational view of the conventional shears as shown in FIG. 13.
Referring to the drawings and initially to FIGS. 1-4, a pair of shears in accordance with the preferred embodiment of the present invention 5 comprise a first cutter 10, a second cutter 20 pivotally connected with the first cutter 10, a driving arm 30 pivotally connected with the first cutter 10 and engaging the second cutter 20 to drive and move the second cutter 20 relative to the first cutter 10, a limit plate 50 abutting the second cutter 20 and the driving arm 30 to limit the second cutter 20 and the driving arm 30, and a 10 connecting plate 40 abutting the second cutter 20 and the driving arm 30 to connect the second cutter 20 and the driving arm 30.
The first cutter 10 has a first end provided with a first shaft hole 12, a second shaft hole 13 and a first cutting portion 14. The first shaft hole 12 of the first cutter 10 is disposed between the second shaft hole 13 and the first cutting 15 portion 14. The first cutting portion 14 of the first cutter 10 is an anvil or a blade and has a curved shape. In the preferred embodiment of the present invention, the first cutting portion 14 of the first cutter 10 is an anvil. The first cutter 10 has a side provided with a first aperture 11 and has a surface provided with a limit knob 15. The first cutter 10 has a second end provided with a 20 mounting seat 16.
The second cutter 20 has a first end provided with a second cutting portion 22 and a second end provided with an extension 23. The second cutting
portion 22 of the second cutter 20 is an anvil or a blade. In the preferred embodiment of the present invention, the second cutting portion 22 of the second cutter 20 is a blade. The extension 23 of the second cutter 20 has an end provided with a first toothed rack 24 which is angled relative to the extension 5 23. The first toothed rack 24 of the second cutter 20 has a side provided with a first through hole 25. The second cutter 20 has a mediate portion provided with a first pivot hole 21 pivotally connected with the first shaft hole 12 of the first cutter 10 by a first pivot set 60a. The first pivot hole 21 of the second cutter 20 is disposed between the second cutting portion 22 and the extension 23. The 10 second cutter 20 has a side provided with a receiving opening 26 which is disposed between the first pivot hole 21, the extension 23 and the first toothed rack 24.
In practice, the second cutting portion 22 of the second cutter 20 is movable relative to the first cutting portion 14 of the first cutter 10 between a 15 closed position as shown in FIG. 7 where the second cutting portion 22 of the second cutter 20 abuts the first cutting portion 14 of the first cutter 10 to perform a shearing action, and an open position as shown in FIG. 5 where the second cutting portion 22 of the second cutter 20 is spaced from the first cutting portion 14 of the first cutter 10. The second cutting portion 22 of the 20 second cutter 20 is moved to abut the limit knob 15 of the first cutter 10 when the second cutting portion 22 of the second cutter 20 is disposed at the open position as shown in FIG. 5, and the extension 23 of the second cutter 20 is
moved to abut the limit knob 15 of the first cutter 10 when the second cutting portion 22 of the second cutter 20 is disposed at the closed position as shown in FIG. 7.
The driving arm 30 and the second cutter 20 are sandwiched between 5 the first cutter 10 and the connecting plate 40 and are connected and limited by the limit plate 50. The driving arm 30 has a first end provided with a connecting portion 31. The connecting portion 31 of the driving arm 30 is connected with the first cutter 10 and is received in the receiving opening 26 of the second cutter 20. The connecting portion 31 of the driving arm 30 has a 10 side provided with a second toothed rack 33 meshing with the first toothed rack 24 of the second cutter 20. The second toothed rack 33 of the driving arm 30 is angled relative to the connecting portion 31 and has a sector shape. The connecting portion 31 of the driving arm 30 has a surface provided with a second pivot hole 32 and a second through hole 34. The second pivot hole 32 15 of the driving arm 30 is pivotally connected with the second shaft hole 13 of the first cutter 10 by a second pivot set 60b. The driving arm 30 has a second end provided with a support portion 35. The support portion 35 of the driving arm 30 has a first end provided with a second aperture 351 and a second end provided with a connecting hole 37.
20 The limit plate 50 has a first end provided with a limit hole 51 and a second end provided with an elongate limit slot 52. The limit hole 51 of the limit plate 50 is pivotally connected with the second through hole 34 of the
8
driving arm 30 by a third pivot set 60c. The limit slot 52 of the limit plate 50 is pivotally connected with the first through hole 25 of the second cutter 20 by a fourth pivot set 60d. The limit slot 52 of the limit plate 50 is slidable on the fourth pivot set 60d.
5 The connecting plate 40 has a first end provided with a first fixing hole 41 and a second end provided with a second fixing hole 42. The first fixing hole 41 of the connecting plate 40 is connected with the first pivot hole 21 of the second cutter 20 and the first shaft hole 12 of the first cutter 10 by the first pivot set 60a. The second fixing hole 42 of the connecting plate 40 is 10 connected with the second pivot hole 32 of the driving arm 30 and the second shaft hole 13 of the first cutter 10 by the second pivot set 60b.
The shears further comprise an elastic member 36 biased between the support portion 35 of the driving arm 30 and the first cutter 10, a pulley set 371 pivotally connected with the support portion 35 of the driving arm 30, and an 15 operation cord 372 mounted between the pulley set 371 and the mounting seat 16. The elastic member 36 is a tensile spring and has two hook portions 361 formed on two opposite ends thereof. The two hook portions 361 of the elastic member 36 are hooked onto the first aperture 11 of the first cutter 10 and the second aperture 351 of the driving arm 30 respectively to drive and move the 20 second cutting portion 22 of the second cutter 20 relative to the first cutting portion 14 of the first cutter 10 to the open position thereof. The pulley set 371
is pivotally connected with the connecting hole 37 of the driving arm 30 by a fifth pivot set 60e.
In the preferred embodiment of the present invention, each of the first pivot set 60a, the second pivot set 60b, the third pivot set 60c, the fourth 5 pivot set 60d and the fifth pivot set 60e includes a bolt 61 and a nut 62 screwed onto the bolt 61.
In operation, referring to FIGS. 5-7 with reference to FIGS. 1-4, when the operation cord 372 is pulled by a user, the driving arm 30 is pivoted downward relative to the first cutter 10 about the second pivot set 60b to 10 extend the elastic member 36. At the same time, the second toothed rack 33 of the driving arm 30 meshes with the first toothed rack 24 of the second cutter 20 so that the second cutter 20 is driven by the driving arm 30 to pivot relative to the first cutter 10 about the first pivot set 60a, and the second cutting portion 22 of the second cutter 20 is moved to abut the first cutting portion 14 of the first 15 cutter 10 as shown in FIG. 7 so as to perform a shearing action. Thus, the second cutter 20 co-operates with the driving arm 30 to perform the shearing action in an energy-saving manner. At this time, the limit plate 50 is connected with the driving arm 30 by the third pivot set 60c and is connected with the second cutter 20 by the fourth pivot set 60d. In such a manner, the second 20 cutter 20 and the driving arm 30 are limited by the limit plate 50, the third pivot set 60c and the fourth pivot set 60d so that the second toothed rack 33 of the driving arm 30 meshes with the first toothed rack 24 of the second cutter 20
closely and exactly, and the second cutter 20 and the driving arm 30 are linked and operated smoothly and stably. In addition, when the second cutter 20 and the driving arm 30 are pivoted downward, the limit plate 50 is pivoted inward about the third pivot set 60c, and the limit slot 52 of the limit plate 50 slides on 5 the fourth pivot set 60d so that the fourth pivot set 60d is moved in the limit slot 52 of the limit plate 50 toward the limit hole 51 of the limit plate 50 as shown in FIGS. 6 and 7. In such a manner, the limit plate 50 will not interfere with movement and operation of the second cutter 20 and the driving arm 30. After the force applied on the operation cord 372 disappears, the second cutter 20 10 and the driving arm 30 are moved backward by the restoring force of the elastic member 36 so that the second cutting portion 22 of the second cutter 20 is moved to space from the first cutting portion 14 of the first cutter 10 as shown in FIG. 5 so as to open the shears.
As shown in FIGS. 1-7, the shears function as a gardening cutting 15 tool, such as a pruning hook, to shear branches or leaves at a higher location.
Referring to FIGS. 8-11, the first cutter 10 has a first end provided with a first shaft hole 12, a second shaft hole 13 and a first cutting portion 14. The first shaft hole 12 of the first cutter 10 is disposed between the second shaft hole 13 and the first cutting portion 14. The first cutting portion 14 of the 20 first cutter 10 is an anvil or a blade and has a curved shape. In the preferred embodiment of the present invention, the first cutting portion 14 of the first cutter 10 is an elongate blade. The first cutter 10 has a surface provided with a
limit knob 15. The first cutter 10 has a second end provided with a first handle 17.
The second cutter 20 has a first end provided with a second cutting portion 22 and a second end provided with an extension 23. The second cutting 5 portion 22 of the second cutter 20 is an anvil or a blade. In the preferred embodiment of the present invention, the second cutting portion 22 of the second cutter 20 is an elongate blade. The extension 23 of the second cutter 20 has an end provided with a first toothed rack 24 which is angled relative to the extension 23. The first toothed rack 24 of the second cutter 20 has a side 10 provided with a first through hole 25. The second cutter 20 has a mediate portion provided with a first pivot hole 21 pivotally connected with the first shaft hole 12 of the first cutter 10 by a first pivot set 60a. The first pivot hole 21 of the second cutter 20 is disposed between the second cutting portion 22 and the extension 23. The second cutter 20 has a side provided with a receiving 15 opening 26 which is disposed between the first pivot hole 21, the extension 23 and the first toothed rack 24.
In practice, the second cutting portion 22 of the second cutter 20 is movable relative to the first cutting portion 14 of the first cutter 10 between a closed position as shown in FIG. 10 where the second cutting portion 22 of the 20 second cutter 20 abuts the first cutting portion 14 of the first cutter 10 to perform a shearing action, and an open position as shown in FIG. 11 where the second cutting portion 22 of the second cutter 20 is spaced from the first
12
cutting portion 14 of the first cutter 10. The extension 23 of the second cutter 20 is moved to abut the limit knob 15 of the first cutter 10 when the second cutting portion 22 of the second cutter 20 is disposed at the closed position as shown in FIG. 10.
5 The driving arm 30 and the second cutter 20 are sandwiched between the first cutter 10 and the connecting plate 40 and are connected and limited by the limit plate 50. The driving arm 30 has a first end provided with a connecting portion 31. The connecting portion 31 of the driving arm 30 is connected with the first cutter 10 and is received in the receiving opening 26 of 10 the second cutter 20. The connecting portion 31 of the driving arm 30 has a side provided with a second toothed rack 33 meshing with the first toothed rack 24 of the second cutter 20. The second toothed rack 33 of the driving arm 30 is angled relative to the connecting portion 31 and has a sector shape. The connecting portion 31 of the driving arm 30 has a surface provided with a 15 second pivot hole 32 and a second through hole 34. The second pivot hole 32 of the driving arm 30 is pivotally connected with the second shaft hole 13 of the first cutter 10 by a second pivot set 60b. The driving arm 30 has a second end provided with a second handle 38.
The limit plate 50 has a first end provided with a limit hole 51 and a 20 second end provided with an elongate limit slot 52. The limit hole 51 of the limit plate 50 is pivotally connected with the first through hole 25 of the second cutter 20 by a third pivot set 60c. The limit slot 52 of the limit plate 50 is
pivotally connected with the second through hole 34 of the driving arm 30 by a fourth pivot set 60d. The limit slot 52 of the limit plate 50 is slidable on the fourth pivot set 60d.
The connecting plate 40 has a first end provided with a first fixing 5 hole 41 and a second end provided with a second fixing hole 42. The first fixing hole 41 of the connecting plate 40 is connected with the first pivot hole 21 of the second cutter 20 and the first shaft hole 12 of the first cutter 10 by the first pivot set 60a. The second fixing hole 42 of the connecting plate 40 is connected with the second pivot hole 32 of the driving arm 30 and the second 10 shaft hole 13 of the first cutter 10 by the second pivot set 60b.
In the preferred embodiment of the present invention, each of the first pivot set 60a, the second pivot set 60b, the third pivot set 60c and the fourth pivot set 60d includes a bolt 61 and a nut 62 screwed onto the bolt 61.
In operation, referring to FIGS. 10 and 11 with reference to FIGS. 8 15 and 9, when the second handle 38 of the driving arm 30 is moved outward relative to the first handle 17 of the first cutter 10, the driving arm 30 is pivoted outward relative to the first cutter 10 about the second pivot set 60b. At the same time, the second toothed rack 33 of the driving arm 30 meshes with the first toothed rack 24 of the second cutter 20 so that the second cutter 20 is 20 driven by the driving arm 30 to pivot relative to the first cutter 10 about the first pivot set 60a, and the second cutting portion 22 of the second cutter 20 is moved outward to space from the first cutting portion 14 of the first cutter 10
as shown in FIG. 11 so as to open the shears. At this time, the limit plate 50 is connected with the second cutter 20 by the third pivot set 60c and is connected with the driving arm 30 by the fourth pivot set 60d. In such a manner, the second cutter 20 and the driving arm 30 are limited by the limit plate 50, the 5 third pivot set 60c and the fourth pivot set 60d so that the second toothed rack 33 of the driving arm 30 meshes with the first toothed rack 24 of the second cutter 20 closely and exactly, and the second cutter 20 and the driving arm 30 are linked and operated smoothly and stably. In addition, when the second cutter 20 and the driving arm 30 are pivoted, the limit plate 50 is pivoted about 10 the third pivot set 60c, and the limit slot 52 of the limit plate 50 slides on the fourth pivot set 60d so that the fourth pivot set 60d is moved in the limit slot 52 of the limit plate 50. In such a manner, the limit plate 50 will not interfere with movement and operation of the second cutter 20 and the driving arm 30.
On the contrary, when the second handle 38 of the driving arm 30 is 15 moved toward the first handle 17 of the first cutter 10, the driving arm 30 is pivoted toward the first cutter 10 about the second pivot set 60b. At the same time, the second toothed rack 33 of the driving arm 30 meshes with the first toothed rack 24 of the second cutter 20 so that the second cutter 20 is driven by the driving arm 30 to pivot toward the first cutter 10 about the first pivot set 20 60a, and the second cutting portion 22 of the second cutter 20 is moved to intersect the first cutting portion 14 of the first cutter 10 as shown in FIG. 10 so
as to perform a shearing action. Thus, the second cutter 20 co-operates with the driving arm 30 to perform the shearing action in an energy-saving manner.
As shown in FIGS. 8-11, the first cutting portion 14 of the first cutter 10 is an elongate blade, and the second cutting portion 22 of the second cutter 5 20 is an elongate blade so that the shears function as a gardening cutting tool to shear a smaller or softer object, such as a leaf, flower or grass.
As shown in FIG. 12, the first cutting portion 14 of the first cutter 10 is an anvil, and the second cutting portion 22 of the second cutter 20 is a blade so that the shears function as a gardening cutting tool to shear a rough or hard 10 object, such as a larger branch.
Accordingly, the first pivot hole 21 of the second cutter 20 is pivotally connected with the first shaft hole 12 of the first cutter 10 by the first pivot set 60a, and the second pivot hole 32 of the driving arm 30 is pivotally connected with the second shaft hole 13 of the first cutter 10 by the second 15 pivot set 60b so that the second cutter 20 and the driving arm 30 are connected with the first cutter 10 respectively to evenly distribute an external shearing force applied on the shears during the cutting process so as to prevent the first pivot set 60a and the second pivot set 60b from being distorted or deformed due to a stress concentration. In addition, the external shearing force applied on 20 the shears is shared by the second cutter 20 and the driving arm 30 without incurring a stress concentration so that the second toothed rack 33 of the driving arm 30 meshes with the first toothed rack 24 of the second cutter 20
closely and exactly, and the second cutter 20 and the driving arm 30 are linked and operated smoothly and stably.
Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other 5 possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention.
17

Claims (1)

  1. CLAIMS 1. A pair of shears, comprising:
    a first cutter;
    a second cutter pivotally connected with the first cutter;
    a driving arm pivotally connected with the first cutter and engaging the second cutter; and a limit plate abutting the second cutter and the driving arm;
    wherein the first cutter has a first end provided with a first shaft hole, a second shaft hole and a first cutting portion;
    the second cutter has a first end provided with a second cutting portion and a second end provided with an extension;
    the extension of the second cutter has an end provided with a first toothed rack;
    the first toothed rack of the second cutter has a side provided with a first through hole;
    the second cutter has a mediate portion provided with a first pivot hole pivotally connected with the first shaft hole of the first cutter by a first pivot set;
    the driving arm has a first end provided with a connecting portion; the connecting portion of the driving arm has a side provided with a second toothed rack meshing with the first toothed rack of the second cutter;
    18
    the connecting portion of the driving arm has a surface provided with a second pivot hole and a second through hole;
    the second pivot hole of the driving arm is pivotally connected with the second shaft hole of the first cutter by a second pivot set;
    5 the limit plate has a first end provided with a limit hole and a second end provided with an elongate limit slot;
    the limit hole of the limit plate is pivotally connected with the second through hole of the driving arm by a third pivot set;
    the limit slot of the limit plate is pivotally connected with the first 10 through hole of the second cutter by a fourth pivot set.
    2. The shears of claim 1, wherein the second cutter has a side provided with a receiving opening which is disposed between the first pivot hole, the extension and the first toothed rack, the connecting portion of the driving arm is received in the receiving opening of the second cutter, the first 15 toothed rack of the second cutter is angled relative to the extension, the second toothed rack of the driving arm is angled relative to the connecting portion and has a sector shape, the limit slot of the limit plate is slidable on the fourth pivot set, the first cutter has a second end provided with a first handle, and the driving arm has a second end provided with a second handle. 20 3. The shears of claim 1, wherein the first cutting portion of the first cutter is an elongate blade, and the second cutting portion of the second cutter is an elongate blade.
    4. The shears of claim 1, wherein the first cutting portion of the first cutter is an anvil, and the second cutting portion of the second cutter is a blade.
    5. A pair of shears substantially as hereinbefore described with reference to and as shown in Figures 1 to 12 of the accompanying drawings.
    20
GB1202553.2A 2012-02-15 2012-02-15 Shears with toothed engagement Withdrawn GB2499407A (en)

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Application Number Priority Date Filing Date Title
GB1202553.2A GB2499407A (en) 2012-02-15 2012-02-15 Shears with toothed engagement

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Application Number Priority Date Filing Date Title
GB1202553.2A GB2499407A (en) 2012-02-15 2012-02-15 Shears with toothed engagement

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GB201202553D0 GB201202553D0 (en) 2012-03-28
GB2499407A true GB2499407A (en) 2013-08-21

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US20080052916A1 (en) * 2006-09-06 2008-03-06 Thomas Lin Tree pruner
US20110154668A1 (en) * 2009-12-25 2011-06-30 Hongbin Liu Double strength loppers
GB2477948A (en) * 2010-02-19 2011-08-24 Ho Cheng Garden Tools Co Ltd Garden secateurs with geared mechanism
GB2483663A (en) * 2010-09-15 2012-03-21 Ho Cheng Garden Tools Co Ltd Garden shears having meshed gear portions
GB2478175A (en) * 2010-11-24 2011-08-31 Ho Cheng Garden Tools Co Ltd Pruning hook with toothed engagement
DE202012100097U1 (en) * 2012-01-11 2012-02-15 Ho Cheng Garden Tools Co., Ltd. Boundary arrangement for a pair of scissors with coupling via tooth engagement

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