EP1500803B1 - Angetriebenes und vom einem Benutzer getragenes Werkzeug ausgestattet mit einem benzinbetriebenen Verbrennungsmotor - Google Patents

Angetriebenes und vom einem Benutzer getragenes Werkzeug ausgestattet mit einem benzinbetriebenen Verbrennungsmotor Download PDF

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Publication number
EP1500803B1
EP1500803B1 EP03425489A EP03425489A EP1500803B1 EP 1500803 B1 EP1500803 B1 EP 1500803B1 EP 03425489 A EP03425489 A EP 03425489A EP 03425489 A EP03425489 A EP 03425489A EP 1500803 B1 EP1500803 B1 EP 1500803B1
Authority
EP
European Patent Office
Prior art keywords
motor
plug
hand held
held tool
powered hand
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.)
Expired - Lifetime
Application number
EP03425489A
Other languages
English (en)
French (fr)
Other versions
EP1500803A1 (de
Inventor
Cristian Dalla Riva
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE60316551T priority Critical patent/DE60316551T2/de
Priority to AT03425489T priority patent/ATE374310T1/de
Priority to EP03425489A priority patent/EP1500803B1/de
Publication of EP1500803A1 publication Critical patent/EP1500803A1/de
Application granted granted Critical
Publication of EP1500803B1 publication Critical patent/EP1500803B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D15/00—Varying compression ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • the subject of the present invention is a powered hand held tool whose weight when operating is born by the user and equipped with an explosion motor fuelled with gasoline, with improved characteristics as regards cost, weight, dimensions, reduction and simplification of components.
  • Tools are known equipped with endothermic motor of sparking plug ignition type fuelled with gasoline and synthetic oil mixture whose weight when operating is born by the user, such as gardening tools, bush cutters, blowers, atomisers, hedge trimmers, power saws et cetera.
  • An endothermic motor for such hand held tools is disclosed in EP-A-0 631 040 .
  • Such tools display as desirable characteristics good ease of handling, reduced weight and dimensions and low purchase or maintenance costs. A brief description of one of such tools is given below with reference to FIGS 1 and 2.
  • Airplane modelling motors are also known equipped with a ignition plug with incandescent filament running only with mixtures containing methyl alchol (and synthetic or castor oil) in which the plug filament for the entire duration of operation of the motor or during the starting phase is kept incandescent by feeding with battery-delivered direct current.
  • Document US-A-3 435 404 discloses a glow plug connector removably attachable to a glow plug mounted in a generic model airplane engine for connecting the glow plug of the engine to a battery during the motor starting phase. In describing the prior art the document mentions a model airplane engine using gasoline as fuel.
  • Document EP-A-0 485 676 faces the problem of eliminating some complications (timed spark plug ignition, step-up coils, condensers, breaker points) of spark ignition in Otto cycle engines fuelled with gasoline, and solves the problem replacing the spark ignition with a incandescent filament glow ignition, using a glow plug allocated in a special ignition chamber distinct from the combustion chamber, with a timing prechamber zone exposing a catalyst.
  • the general purpose of the present invention is realization of a powered hand held tool whose weight when operating is born by the user and equipped with an explosion motor fuelled with gasoline having improved characteristics as regards weight, dimensions, reduction and simplification of components, reduction of purchase, operating and maintenance cost.
  • the powered hand held tool according to the present invention whose weight when operating is born by the user, is equipped with an explosion motor fuelled with gasoline and synthetic oil mixture, with a combustion chamber (1c) and an igniter means (1b) exposed within the combustion chamber, and is characterized in that:
  • FIGS in the drawings show:
  • FIG 1 shows an overall perspective view of a conventional trimmer. In its essential parts it consists of
  • FIG 2 shows an exploded view of the motor housed in the case "a” and some of its component parts. In particular it shows the following parts:
  • the structure of the flywheel 4 is rather costly and complicated because it is made of die-cast aluminum and the fan 4a also includes permanent magnets designed to create a rotating magnetic field for excitation of an induced winding (not shown in FIG 2) of the current generator which feeds the ignition coil.
  • the solution idea underlying the present invention consists of effecting ignition of the motor with an incandescent filament plug of the type used in airplane modeling motors, for example of the O.S. brand type F with anomalous feeding procedure compared to the conventional procedure of powering motors with incandescent filament plug to obtain considerable advantages.
  • the innovation of the present invention calls for feeding the motor with a mixture of gasoline and feeding of the ignition plug filament limited to the starting phase of the motor because said filament is kept permanently incandescent after the starting phase of the motor by an appropriate choice of the compression ratio.
  • the means adoptable for obtaining feeding of the incandescent filament plug limited to the starting phase can consist merely of a switch fitted in the feeding circuit of the incandescent filament plug and positionable in closed condition by a control button located on the grip of the powered tool, a button which the user must keep pressed during the entire starting phase.
  • Shutting down the motor can also be obtained merely by means of a control on the grip designed to shut off delivery of fuel to the motor.
  • the batteries usable for powering the incandescent filament plug can be penlight batteries already in trade either of the throwaway or the rechargeable type.
  • an embodiment version of the powered tool can include a recharging appa ratus for the batteries so as to simplify the recharging operations for the user.
  • powering of the incandescent filament plug limited to the motor starting phase could be obtained by means of a switch controlled not by a button but by a timer operating automatically when pulling the starting rope.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Portable Power Tools In General (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Claims (5)

  1. Angetriebenes und von einem Benutzer getragenes Werkzeug, ausgestattet mit einem Verbrennungsmotor, der mit einem Benzin-Synthetiköl-Gemisch betrieben wird und eine Brennkammer (1c) und ein Zündmittel (1b), das in der Brennkammer (1c) offen liegt, aufweist, dadurch gekennzeichnet, dass:
    - das Zündmittel (1b) eine Glühwendelkerze ist,
    - der Aktivierungsstrom der Glühwendelkerze nur in der Startphase des Motors zugeführt wird, und
    - das Verdichtungsverhältnis des Motors so gewählt ist, dass gewährleistet wird, dass die Temperatur des wendels der Glühwendelkerze am Ende eines Verbrennungstaktes einen Wert erreicht, der so hoch ist, dass das Glühen des Wendels bis zum nächsten Verbrennungstakt beibehalten bleibt.
  2. Angetriebenes und von einem Benutzer getragenes Werkzeug nach Anspruch 1, dadurch gekennzeichnet, dass das Mittel, das zum Bewerkstelligen der auf die Startphase des Motors beschränkten Aktivierung der Glühwendelkerze verwendet wird, aus einem Schalter besteht, der in den Stromkreis der Glühwendelkerze eingefügt ist und mit Hilfe einer Bedientaste, die der Benutzer während der gesamten Motorstartphase gedrückt halten muss, in einen geschlossenen Zustand versetzt werden kann.
  3. Angetriebenes und von einem Benutzer getragenes Werkzeug nach Anspruch 1, dadurch gekennzeichnet, dass das Abschalten des Motors mit Hilfe eines manuellen Bedienelements bewerkstelligt wird, das dafür ausgelegt ist, die Kraftstoffzufuhr zu dem Motor zu unterbrechen.
  4. Angetriebenes und von einem Benutzer getragenes Werkzeug nach Anspruch 1, dadurch gekennzeichnet, dass der Strom, der die Glühwendelkerze aktiviert, von Penlight-Batterien vom Wegwerf- oder wiederaufladbaren Typ geliefert wird.
  5. Angetriebenes und von einem Benutzer getragenes Werkzeug nach Anspruch 4, dadurch gekennzeichnet, dass es eine Vorrichtung zum Wiederaufladen der Batterien enthält.
EP03425489A 2003-07-22 2003-07-22 Angetriebenes und vom einem Benutzer getragenes Werkzeug ausgestattet mit einem benzinbetriebenen Verbrennungsmotor Expired - Lifetime EP1500803B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60316551T DE60316551T2 (de) 2003-07-22 2003-07-22 Angetriebenes und von einem Benutzer getragenes Werkzeug, ausgestattet mit einem Verbrennungsmotor
AT03425489T ATE374310T1 (de) 2003-07-22 2003-07-22 Angetriebenes und vom einem benutzer getragenes werkzeug ausgestattet mit einem benzinbetriebenen verbrennungsmotor
EP03425489A EP1500803B1 (de) 2003-07-22 2003-07-22 Angetriebenes und vom einem Benutzer getragenes Werkzeug ausgestattet mit einem benzinbetriebenen Verbrennungsmotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03425489A EP1500803B1 (de) 2003-07-22 2003-07-22 Angetriebenes und vom einem Benutzer getragenes Werkzeug ausgestattet mit einem benzinbetriebenen Verbrennungsmotor

Publications (2)

Publication Number Publication Date
EP1500803A1 EP1500803A1 (de) 2005-01-26
EP1500803B1 true EP1500803B1 (de) 2007-09-26

Family

ID=33484091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03425489A Expired - Lifetime EP1500803B1 (de) 2003-07-22 2003-07-22 Angetriebenes und vom einem Benutzer getragenes Werkzeug ausgestattet mit einem benzinbetriebenen Verbrennungsmotor

Country Status (3)

Country Link
EP (1) EP1500803B1 (de)
AT (1) ATE374310T1 (de)
DE (1) DE60316551T2 (de)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1463855A (en) * 1921-07-14 1923-08-07 Tartrais Eugene Henri Ignition device for internal-combustion engines
US2126442A (en) * 1935-02-13 1938-08-09 Baud Albert Crude oil engine
DE905078C (de) * 1942-10-14 1954-02-25 Hermann Papst Niederspannungszuendeinrichtung
US3435404A (en) * 1967-09-28 1969-03-25 Royal Products Inc Glow plug connector
US4245589A (en) * 1978-07-18 1981-01-20 Ryan Joseph C Exothermic injector adapter
US5109817A (en) * 1990-11-13 1992-05-05 Altronic, Inc. Catalytic-compression timed ignition
AU5942494A (en) * 1993-06-25 1995-01-05 Mcculloch Corporation Four-stroke internal combustion engine
IT239525Y1 (it) * 1995-12-05 2001-03-05 Compagnucci Spa Motore ad accensione elettrica per automodelli dotato diraffeddamento ad aria forzata
IT1292223B1 (it) * 1997-05-07 1999-01-29 Giorgio Enrico Falck Motore a combustione interna provvisto di distribuzione a fodero rotante

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1500803A1 (de) 2005-01-26
ATE374310T1 (de) 2007-10-15
DE60316551D1 (de) 2007-11-08
DE60316551T2 (de) 2008-07-03

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