WO2014209134A1 - Cisailles à lames multifonctionnelles - Google Patents

Cisailles à lames multifonctionnelles Download PDF

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Publication number
WO2014209134A1
WO2014209134A1 PCT/NZ2014/000124 NZ2014000124W WO2014209134A1 WO 2014209134 A1 WO2014209134 A1 WO 2014209134A1 NZ 2014000124 W NZ2014000124 W NZ 2014000124W WO 2014209134 A1 WO2014209134 A1 WO 2014209134A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
handle
shears
pair
hub
Prior art date
Application number
PCT/NZ2014/000124
Other languages
English (en)
Inventor
Richard Paul Watson
Original Assignee
Richard Paul Watson
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 Richard Paul Watson filed Critical Richard Paul Watson
Priority to AU2014299412A priority Critical patent/AU2014299412B2/en
Priority to GB1600088.7A priority patent/GB2529985B/en
Publication of WO2014209134A1 publication Critical patent/WO2014209134A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B13/00—Hand shears; Scissors
    • B26B13/04—Hand shears; Scissors with detachable blades
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B13/00—Hand shears; Scissors
    • B26B13/12—Hand shears; Scissors characterised by the shape of the handles
    • B26B13/14—Hand shears; Scissors characterised by the shape of the handles without gripping bows in the handle
    • B26B13/16—Hand shears; Scissors characterised by the shape of the handles without gripping bows in the handle spring loaded, e.g. with provision for locking the blades or the handles

Definitions

  • the present invention relates to shears, and in particular to blade shears used to cut wool, fur, or hair from a sheep, goat, cow, alpaca, llama, yak, dog or other animal.
  • the multi-purpose blade shears may also be used for trimming and cutting of plant material and any other shearing or cutting use. However, there may be many uses for the shears so that the above list of uses should not be seen as limiting.
  • Shears have numerous uses in practice, including use to cut wool, fur, or hair from a sheep, goat, cow, alpaca, llama, yak, dog or other animal. Shears may also be used for trimming and cutting plant material as well as many other uses.
  • shears In the following the use of shears is mainly described in their use in shearing sheep and other animals. However, those skilled in the art will appreciate that this is but one example of the use of shears, and that reference to shears for shearing sheep and other animals only throughout this specification should not be seen as limiting.
  • Blade shears normally have two blades, each connected to a handle, where the handles are connected at, and pivot about, a point near the rear end (i.e. the end distal to the blade end) of the shears, essentially behind a hand of a user.
  • This is in contrast to a pair of scissors, for example, which also consist of a pair of blades, each one connected to handle, but the connection and pivot point for a pair of scissors is near the middle of the scissors, and in front of a hand of a user.
  • Blade shears are typically made out of steel, the blades being hollow ground from high carbon steel, and the handles made from sprung steel.
  • Each handle and attached blade is normally formed as a single item (much as with scissors) and the handles are typically riveted together towards the rear end of the handle.
  • the handles have a characteristic shape, having a relatively straight section (which is formed to accommodate the hand of a user) before curving away from the straight section into an arc which turns back on itself towards the blade end of the shears, the arc terminating around an imaginary central line of the blade shears.
  • the blade shears are formed by riveting together the ends of the arcs of each handle. This arrangement
  • One of the blades (typically the lower blade in use) has a guide ("coxspur") which assists to hold the two sprung blades together in use.
  • the high carbon steel blades are initially formed with a straight blade. However, the blades can quickly become bent into a curved shape due to wear and tear in a shearing environment, e.g., through being dropped, stood on, or whatever.
  • the shears are designed to work efficiently with a straight blade; hence when the blade becomes bent the cutting action is less effective.
  • bent blades cause the blades to run apart (i.e. contact between the cutting edges only occurs in a small portion of the blade at any one time, as to along the blades when straight) which can lead to the blades going blunt more quickly than otherwise.
  • shears require frequent maintenance to sharpen the cutting edges and to straighten the bent blades. This can be a relatively difficult and costly operation; the shears cannot be used while maintenance is carried out on the bent or blunted blades, and more shears than would normally be required must be provided if work is to continue.
  • the blades of the prior art blade shears cannot be replaced. If a blade becomes so damaged that maintenance would be too costly or time consuming, they need to be replaced with a new pair of blade shears which adds to the cost and may be inconvenient, especially if a new set is not immediately available and has to be ordered in.
  • a pair of blade shears including: a first blade having a cutting surface bounded on one side by a cutting edge; a first handle connected to the first blade; a second blade having a cutting surface bounded on one side by a cutting edge; a second handle connected to the second blade; and a biasing device configured to connect the first handle to the second handle, the biasing device located at or in the vicinity of an end of the first handle distal to the blade end of the first blade; wherein the biasing device is configured to apply a force to the first handle and/or the second handle, the force biased to push the first handle and the second handle apart in a plane of the first blade and first handle, and wherein the second handle is pivotally mounted to the biasing device, the pivot axis lying substantially in the plane of the first blade and the first handle.
  • the blade and handle are 3D objects and as such do not lie in a single plane.
  • the plane of the blade and handle should be taken generally to mean a plane though the blade and handle substantially parallel to the plane of a flat surface on which a side of the blade and handle is laid.
  • a feature of the pair of blades of the present invention is that one of the blades is pivoted relative to the other blade so that the blades can be brought together with the cutting edge of one blade in contact with the cutting edge of the other blade (pivot angle 0°), or the blades can be opened so that there is an angle between the plane of the first blade and a plane of the second blade.
  • An advantage of this arrangement is a user may use the pivot to relatively easily bring the two blades together, and keep them together, to make a cut. This may be considerably less tiring on a user and require less skill than the twisting and shearing motion required to operate blade shears of the prior art.
  • the first blade is releasably attached to the first handle.
  • the second blade is releasably attached to the second handle.
  • the blade must be fixed firmly to the handle in order for the blade shears to function properly. Therefore the term "releasably” as used above should be understood to mean that the blades can be removed from the handles without destroying the blades or the handles, and new blades can be fitted to the handles to provide a working pair of shear blades with new blades.
  • releasable attachments may include (without limitation) screwing, bolt and nut or any other method of releasable attachment as well known in the field.
  • the cutting surface of the first blade includes a first portion that is substantially flat and extends from the vicinity of a front end of the first blade to the vicinity of a rear end of the first blade, and a second portion that is bounded on one side by the first portion and on another side by the cutting edge, wherein the second portion is substantially flat and inclined with respect to the first portion.
  • the cutting surface of the second blade is configured into a first portion that is substantially flat and extends from the vicinity of a front end of the second blade to the vicinity of a rear end of the second blade, and a second portion that is bounded on one side by the first portion and on another side by the cutting edge, wherein the second portion is substantially flat and inclined with respect to the first portion.
  • the biasing device is a hub having a hub axle, the hub including a first attachment portion configured to connect to the first handle and a second attachment portion configured to connect to the second handle, wherein the first attachment portion and the second attachment portion are connected to the hub axle such that the hub axle acts as a pivot for the first attachment portion and independently for the second attachment portion.
  • the hub includes a biasing means configured to bias the first attachment portion to move away from the second attachment portion and vice versa.
  • the biasing means is a coil spring.
  • first handle When assembled the first handle is attached to the first attachment portion of the hub and the second handle is attached to the second attachment portion such that the cutting surfaces of the first blade and the second blade face one another when the shears are in a closed position (i.e. the biasing force of the bub has been overcome to bring the first attachment portion to a closed position close to the second attachment portion).
  • the pair of blade shears includes a handle lock configured to lock the first handle and the second handle together when in a closed position, and to allow the first handle and the second handle to move when in an open position.
  • the closed position of the handle lock can only be operated when the blades are in the closed position.
  • an end of the second handle distal to the end having the second blade is configured to pivotally attach to the second attachment portion of the hub, using a hub pivot having a pivot axis which lies in the plane of the first blade and handle.
  • the second blade and handle can move in and out of the plane of the first blade and handle about the hub pivot, the pivot axis of which lies in the plane of the first blade and handle.
  • the second handle includes a recess located in the vicinity of the hub pivot, the recess configured to locate a second biasing device, wherein the second biasing device provides a biasing force pushing the cutting surface of the first blade toward the cutting surface of the second blade and vice versa.
  • the second biasing device is a compression spring.
  • Figure 1 shows a view of a pair of blade shears according to one embodiment of the present invention
  • Figure 2 shows a side view of a blade according to one embodiment of the present
  • Figure 3 shows a cross sectional view of a blade shown in Fig.2;
  • Figure 4 shows a view of part of the pair of blade shears of the embodiment shown in BEST MODES FOR CARRYING OUT THE INVENTION
  • a pair of blade shears according to one embodiment of the present invention is generally indicated by arrow 1 in Fig. 1.
  • the blade shears include a first blade 2 having a cutting surface 3 bounded on one side by a cutting edge 4.
  • a first handle 5 is connected to the first blade.
  • the blade shears also include a second blade 6 having a cutting surface 7 bounded on one side by a cutting edge 8.
  • a second handle 9 is connected to the second blade.
  • the first and second blades are formed from 2D stainless steel. This is much stronger, has greater durability, and retains a sharp cutting edge much longer than the high C steels used in the prior art blade shears.
  • the cutting edge of the present invention may remain sharp during operations on around 50 sheep, as against around 3 sheep for the prior art shears. This may significantly reduce time and labour costs for maintenance of the cutting edges, providing much enhanced efficiency and less inconvenience to the user.
  • the blades 2, 6 and the handles 5, 9 respectively, are attached together by Allen key screws 10. These can be removed to release the blade from the handle so that a new blade can be fitted as required. This may provide a considerable saving in maintenance time and cost, especially as with the prior art blade shears the blades cannot be replaced; failure of one blade means the pair of blades are disposed of.
  • the form of the blades in one embodiment of the present invention may further enhance the operation of the blade shears.
  • the cutting surface (i.e. the interior surface of the blade when assembled as a pair of blade shears) of blade 11 is formed in two portions; a first portion 12 and a second portion 13.
  • the first portion is flat and extends from the front end of the blade 14 to the rear end 15.
  • the first portion extends across the blade from a top side of the blade 16 to a fold 17 in the blade.
  • the second portion is also flat, and is bounded on one side by the fold 17 and on the other side by a cutting edge 18.
  • a cross-sectional view through the blade 11 is shown in Fig. 3, which clearly shows the fold 17 which separates the first portion 12 from the second portion 13. It also clearly shows that the second portion is inclined with respect to the first portion.
  • the pair of blade shears include a biasing device, shown in Fig.1 in the form of a hub 19 located at or near the end of the blade shears distal to the blade end.
  • the hub includes a hub axle 20 and a first attachment portion 21 configured to connect the first handle 5 to the hub 19.
  • Handle 5 and hub 19 are arranged so that there are two acetal plastic bearings between the two, the arrangement held together by bolt and a lock tight nut (not shown).
  • the hub, on the nut side is configured to be substantially the same shape and size of the nut, so that the nut and bolt can not turn in relation to handle 5.
  • the hub 19, on the bolt side is configured so that the top of the bolt can turn in relation to the hub 19.
  • a fixed washer (not shown) between the bolt and hub facilitates rotational movement of the bolt with respect to the hub.
  • the hub also includes a second attachment portion 22.
  • the first attachment portion and the second attachment portion are connected to the hub axle such that the hub axle acts as a pivot for the first attachment portion and independently for the second attachment portion
  • the second attachment portion 22 is in the form of a hub pivot formed by pivot pin 23, cylinder 24 on the second attachment portion and apertures 25 and 26 on lugs 27 and 28 respectively, as shown in more detail in Fig. 4.
  • the pivot axis As can be seen in Fig. 1 the pivot axis, indicated by dashed line 29, lies in a plane of the first blade 2 and first handle 5 and is oriented substantially at a right angle to a longitudinal axis of the second handle and second blade.
  • the hub pivot includes a second biasing device in the form of a compression spring 35 located in a recess 36 in the second handle 9, the compression spring biased to push the cutting surface 3 of the first handle 5 towards the cutting surface 8 of the second handle 9 and vice versa, the force being applied in a plane of the hub at right angles to the hub axle 20, i.e. a plane of the first blade and the first handle.
  • the pair of shears includes a handle lock in the form of a locking device 30 on the second handle 9 which engages with an aperture 31 in the first handle 5 when the blade shears are in the closed position.
  • the locking device consists of a lug 32 which can slide along a groove (not shown) in the second handle. Typically the locking device is manually operated as required.
  • the first handle 5 includes a rest 33 designed to improve a user's ability to operate the blade shears.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Scissors And Nippers (AREA)

Abstract

La présente invention concerne une paire de cisailles à lames (1), qui comprend une première lame (2) et une seconde lame (6), chaque lame comportant une poignée respective (5, 9), et un dispositif de sollicitation (19) conçu pour raccorder la première poignée (5) à la seconde poignée (9). Le dispositif de sollicitation est conçu pour appliquer une force sur la première poignée (5) et/ou la seconde poignée (9), la force sollicitée étant destinée à pousser la première poignée et la seconde poignée pour les éloigner dans un plan de la première lame (2) et de la première poignée (5). La seconde poignée (9) est montée de manière pivotante sur le dispositif de sollicitation (19), l'axe de pivotement (29) s'étendant sensiblement dans le plan de la première lame et de la première poignée.
PCT/NZ2014/000124 2013-06-26 2014-06-24 Cisailles à lames multifonctionnelles WO2014209134A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2014299412A AU2014299412B2 (en) 2013-06-26 2014-06-24 Multi-purpose blade shears
GB1600088.7A GB2529985B (en) 2013-06-26 2014-06-24 Multi-purpose blade shears

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ612536 2013-06-26
NZ61253613A NZ612536A (en) 2013-06-26 2013-06-26 Multi-purpose blade shears

Publications (1)

Publication Number Publication Date
WO2014209134A1 true WO2014209134A1 (fr) 2014-12-31

Family

ID=52142339

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2014/000124 WO2014209134A1 (fr) 2013-06-26 2014-06-24 Cisailles à lames multifonctionnelles

Country Status (4)

Country Link
AU (1) AU2014299412B2 (fr)
GB (1) GB2529985B (fr)
NZ (1) NZ612536A (fr)
WO (1) WO2014209134A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089113A (en) * 1977-08-08 1978-05-16 Robinson Knife Manufacturing Co., Inc. Thread snip
US4326335A (en) * 1980-10-02 1982-04-27 Morton Ray E Metal shears
AU1046292A (en) * 1991-01-24 1992-07-30 Richard Puddicombe Universal hand shears for sheep
NZ280562A (en) * 1995-11-30 1997-02-24 Richard Paul Watson Hand shears with removable blades

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089113A (en) * 1977-08-08 1978-05-16 Robinson Knife Manufacturing Co., Inc. Thread snip
US4326335A (en) * 1980-10-02 1982-04-27 Morton Ray E Metal shears
AU1046292A (en) * 1991-01-24 1992-07-30 Richard Puddicombe Universal hand shears for sheep
NZ280562A (en) * 1995-11-30 1997-02-24 Richard Paul Watson Hand shears with removable blades

Also Published As

Publication number Publication date
NZ612536A (en) 2015-01-30
GB201600088D0 (en) 2016-02-17
GB2529985A (en) 2016-03-09
AU2014299412A1 (en) 2016-01-21
AU2014299412B2 (en) 2016-05-12
GB2529985B (en) 2020-02-19

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