WO1996003856A1 - Secateurs equipes d'un ensemble d'entrainement, pour couper des branches et autres - Google Patents

Secateurs equipes d'un ensemble d'entrainement, pour couper des branches et autres Download PDF

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Publication number
WO1996003856A1
WO1996003856A1 PCT/IT1995/000132 IT9500132W WO9603856A1 WO 1996003856 A1 WO1996003856 A1 WO 1996003856A1 IT 9500132 W IT9500132 W IT 9500132W WO 9603856 A1 WO9603856 A1 WO 9603856A1
Authority
WO
WIPO (PCT)
Prior art keywords
shears
piston
cylinder
combustion chamber
blade
Prior art date
Application number
PCT/IT1995/000132
Other languages
English (en)
Inventor
Gabriel Balogh
Original Assignee
Campagnola S.R.L.
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 Campagnola S.R.L. filed Critical Campagnola S.R.L.
Priority to AU30855/95A priority Critical patent/AU3085595A/en
Publication of WO1996003856A1 publication Critical patent/WO1996003856A1/fr

Links

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
    • A01G3/033—Secateurs; Flower or fruit shears having motor-driven blades

Definitions

  • the invention relates to devices for pruning, in particular to shears, used for cutting branches or vine-shoots.
  • Electric, pneumatic or hydraulic energy necessary for operating these shears is supplied by external sources,- the engine of electric shears is fed with energy supplied by an accumulator carried by the operator on his shoulder, whereas pneumatic or hydraulic shears can be used only if a source of compressed air or a hydraulic pump, respectively, is present near the place, in which the device is used.
  • An object of the present invention is to propose shears that are easy to handle, that can be operated without external energy sources, and have high autonomy and reduced weight.
  • a further object of the subject invention is to propose mechanically simple, reliable and cheap shears.
  • a driver assembly equipped shears for cutting bran ⁇ ches or the like including a hand ⁇ grip and a pair of shearing blades, namely a sta ⁇ tionary blade and movable blade, pivoted to each other and to an external end of the said handgrip.
  • the driver assembly (30) include.- a cylinder, contained in the handgrip and featuring conduits, respectively a suction conduit and exhaust conduit, leading to openings made in the wall of the cylinder,- a piston sliding inside the cylinder and linked to the movable shearing blade via a piston rod; a cylinder head fixed to the cylinder and featuring a combustion chamber,- elastic means associated to the said piston so as to push it towards the said combustion chamber thus opening the movable blade with respect to the sta ⁇ tionary blade,- feeding means supported by the cylinder head aimed at withdrawing a pre-set quantity of fuel from a reservoir and injecting this fuel under pressure into the combustion chamber,- ignition means also supported by the cylinder head for firing an exploding mixture formed in the said combustion chamber by the said fuel and air, thus starting the active stroke of the piston and pro- gressively moving the movable blade towards the stationary blade.
  • FIG. 1 shows a lateral view of the shears
  • - figures 2a and 2b show sectional lateral views of the shears with the blades open and close, respect ⁇ ively;
  • - figure 3 shows a partial lateral view of the shears as seen from the side opposite to the fig. 1 view;
  • the shears 100 substantially include an anato ⁇ mical handgrip 1 and a pair of blades 2, 2a, namely a stationary blade and movable blade, pivoted to each other in correspondence of the outer end la of the handgrip 1.
  • the shears 100 are equipped with a driver assembly 30, described in the following in a more detailed way, whose operation can be compared with a internal combustion two-stroke engine with con- trolled ignition, aimed at working continuously between a minimum and maximum revolution rate, but different from it because operating in single im ⁇ pulses fashion.
  • An active stroke and a return stroke of a piston 32 correspond to each of the single impulses.
  • the driver assembly 30 is connected to the movable blade 2a and keeps this latter open, with respect to the stationary blade 2, during the return stroke of the piston 32.
  • the movable blade 2a is instead closed, with respect to the stationary blade 2.
  • the driver assembly 30 includes a cylinder 31, contained in the handgrip 1, with the piston 32 sliding inside the said cylinder and linked to the movable shearing blade 2a by means of a piston rod
  • the cylinder 31 features a suction conduit 31a and an exhaust conduit 31b, leading to openings 310, 320 made in the wall of the cylinder.
  • the opening 310 communicates with a blow off spout 311, equipped with a protection net 312 that prevents foreign matters from entering the conduit 31a (figs. 1 and 5) .
  • the openings 320 communicate with a silencer 321 (figs. 1 and 4) .
  • a cylinder head 35 is fixed to the cylinder
  • Elastic means 40 are placed between the part of the piston 32 to which the piston rod 33 is articulated and a ring-like stop 313, made in the cylinder 31 on the opposite part with respect to the head 35 (fig. 2a) .
  • the elastic means 40 push the piston 32 toward the combustion chamber 36.
  • the driver assembly 30 includes also feeding means 60, supported .by the cylinder head 35, and including as follows: a reservoir 61 filled with fuel and compressed air, connected, via a first duct 62, to a proportioning valve 63, that is in turn connected, via a second duct 64 to an injecting nozzle 65 directed inwards of the combustion chamber 36.
  • the same cylinder head 35 supports also ignition means 70 for firing and exploding mixture formed in the combustion chamber 36, and including a piezoelectric transducer 71 aimed at supplying high voltage impulses to an ignition spark 72 situated inside the combustion chamber 36.
  • the driver assembly 30 includes also activa ⁇ ting means 50 comprising, in the illustrated exam ⁇ ple, a manually operated lever 51 having prongs 51a, si (fig. 2) for respectively controlling in se ⁇ quence the proportioning valve 63 and the piezoelec ⁇ tric transducer 71.
  • the reservoir 61 is filled by removal of the bottom 610, introduction of a pre-set quantity of fuel, anyway less than the volume of the reservoir 61 thus leaving an empty space, putting on again the bottom 610 and introduction of compressed air into the reservoir via a valve 613 integral with the bottom, until the required pressure is obtained.
  • the fuel pushed by the compressed air is kept by the proportioning valve 63 close in its idle position.
  • lever 51 causes in sequence: opening of the proportioning valve 63 (prong 51a) , delivery of a pre-set quantity of fuel under pres- sure to the nozzle 65 for the injection of this pre ⁇ set quantity of fuel in the combustion chamber, operating the piezoelectric transducer 71 (prong 51b) that generates the spark in the ignition plug 72. Consequently, this provokes explosion of the mixture air/fuel and the subsequent active stroke of a piston 32 that closes the movable blade 2a with respect to the stationary blade 2, against elastic reaction of the elastic means 40 (fig. 2b) .
  • the piston 32 uncovers first the exhaust conduit 31b, allowing burnt gases to evacuate, then the suction conduit 31a that, exploiting also depression formed in the cylinder after the rapid evacuation of burnt gases, allows fresh air to be introduced to the cylinder.
  • the elastic means 40 cause the return stroke of the piston 32, thus compressing air introduced to the cylinder via the suction conduit on one side, and opening the shearing blades again on the other side.
  • the pressure of air in the combustion chamber 36 could be lowered because of inevitable leaking between the elastic rings of the piston 32 and the cylinder 31. In this case it is enough to act manually on the movable blade 2a so as to make the piston 32 perform the complete cycle (active and return strokes) .
  • the pressure of air in the reservoir is big enough to inject the fuel even if the latter is getting exhausted.
  • the proportioning valve 63 is adjustable, so that it can suitably dose the quantity of the fuel sent to the injection nozzle 65.
  • the head 35 is connected to the cylinder 31 by a threaded joining made between the head and the end lb of the handgrip
  • the threaded joining allows to remove in simple way the head 35 from the handgrip l, thus facilitating maintainance operations.
  • the material, of which the handgrip is made isolates thermally the cylinder from the user hand. It is important to point out that even in ⁇ tense use of the shears does not cause such increase of its temperature big enough to prevent its using, since the frequency of explosions, if compared with the minimum operation rate of an ic engine, is anyway extremely limited.
  • the proposed technical solution is mechanic ⁇ ally simple, reliable and cheap.
  • the type of fuel use in the example herein described is the one used for explosion engines, e.g. petrol (possibly mixed with oil), methane, L.P.G. (liquid petroleum gas), ethanol .

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Environmental Sciences (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Shovels (AREA)

Abstract

Les sécateurs (100), selon l'invention, qui comprennent un manche (1) et une paire de lames de cisaillement (2, 2a), notamment une lame fixe et une lame mobile, accouplées entre elles par pivot, comprennent en outre un ensemble d'entraînement (30) fonctionnant par impulsions. Cet ensemble d'entraînement comprend des moyens d'alimentation (60), des moyens d'allumage (70) ainsi que des moyens d'activation manuels (50), de sorte qu'un mélange explosif puisse être injecté et allumé dans une chambre de combustion (36). L'explosion du mélange provoque la course active d'un piston (32) à l'encontre de moyens élastiques (40), et le déplacement de la lame mobile (2a) qui y est connectée contre la lame fixe. Lorsque la force explosive s'interrompt, les moyens élastiques entraînent le piston (32) sur sa course de retour, et, de ce fait, provoquent l'ouverture des lames de cisaillement.
PCT/IT1995/000132 1994-08-02 1995-07-31 Secateurs equipes d'un ensemble d'entrainement, pour couper des branches et autres WO1996003856A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU30855/95A AU3085595A (en) 1994-08-02 1995-07-31 Driver assembly equipped shears for cutting branches or the like

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO94A000377 1994-08-02
ITBO940377A IT1274877B (it) 1994-08-02 1994-08-02 Cesoia integrata con un gruppo motore per la recisione di romi o simili.

Publications (1)

Publication Number Publication Date
WO1996003856A1 true WO1996003856A1 (fr) 1996-02-15

Family

ID=11339981

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1995/000132 WO1996003856A1 (fr) 1994-08-02 1995-07-31 Secateurs equipes d'un ensemble d'entrainement, pour couper des branches et autres

Country Status (3)

Country Link
AU (1) AU3085595A (fr)
IT (1) IT1274877B (fr)
WO (1) WO1996003856A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002054855A1 (fr) * 2001-01-16 2002-07-18 Worldwide Vineyards Dispositif de prelevement de greffons
NL1037495C2 (nl) * 2009-11-24 2011-05-25 Johannes Henricus Helena Maria Smits Inrichting en gestel voor het bewerken van een voorwerp, zoals een tegel, klinker en baksteen, en samenstel van gestel en expansie-eenheid.
EP2371195A1 (fr) * 2010-03-29 2011-10-05 Honda Motor Co., Ltd. Machine de travail portable à moteur à gaz

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693254A (en) * 1970-08-26 1972-09-26 Albert R Salonen Motorized shearing implement
EP0123502A2 (fr) * 1983-04-18 1984-10-31 Alphonsus Gerardus Gulielmus Veldman Outils portatifs à moteur

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693254A (en) * 1970-08-26 1972-09-26 Albert R Salonen Motorized shearing implement
EP0123502A2 (fr) * 1983-04-18 1984-10-31 Alphonsus Gerardus Gulielmus Veldman Outils portatifs à moteur

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002054855A1 (fr) * 2001-01-16 2002-07-18 Worldwide Vineyards Dispositif de prelevement de greffons
FR2819375A1 (fr) * 2001-01-16 2002-07-19 Worldwide Vineyards Dispositif de prelevement de greffon
NL1037495C2 (nl) * 2009-11-24 2011-05-25 Johannes Henricus Helena Maria Smits Inrichting en gestel voor het bewerken van een voorwerp, zoals een tegel, klinker en baksteen, en samenstel van gestel en expansie-eenheid.
EP2371195A1 (fr) * 2010-03-29 2011-10-05 Honda Motor Co., Ltd. Machine de travail portable à moteur à gaz
TWI404857B (zh) * 2010-03-29 2013-08-11 Honda Motor Co Ltd 燃氣引擎動力手持式作業機

Also Published As

Publication number Publication date
AU3085595A (en) 1996-03-04
IT1274877B (it) 1997-07-25
ITBO940377A0 (it) 1994-08-02
ITBO940377A1 (it) 1996-02-02

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