WO1992000165A1 - Outil de coupe - Google Patents

Outil de coupe Download PDF

Info

Publication number
WO1992000165A1
WO1992000165A1 PCT/GB1991/001029 GB9101029W WO9200165A1 WO 1992000165 A1 WO1992000165 A1 WO 1992000165A1 GB 9101029 W GB9101029 W GB 9101029W WO 9200165 A1 WO9200165 A1 WO 9200165A1
Authority
WO
WIPO (PCT)
Prior art keywords
blades
tool
drive means
cutter head
blade
Prior art date
Application number
PCT/GB1991/001029
Other languages
English (en)
Inventor
Keith Lodge
Original Assignee
Keith Lodge
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 Keith Lodge filed Critical Keith Lodge
Publication of WO1992000165A1 publication Critical patent/WO1992000165A1/fr
Priority to GB9325989A priority Critical patent/GB2273258B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/10—Means for driving the impulse member comprising a cam mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/275—Tools having at least two similar components
    • B25D2250/285—Tools having three or more similar components, e.g. three motors
    • B25D2250/291—Tools having three or more parallel bits, e.g. needle guns

Definitions

  • This invention relates to a cutting tool.
  • a cutting tool for example a hand chisel, in which a usually rectilinear cutting edge is driven into a workpiece in a direction perpendicular to the cutting edge.
  • the smaller tools of this kind have not been motorized because of the difficulty of providing drive means capable of delivering an effective percussive force to the cutting edge.
  • a cutting tool having a cutting edge defined by a plurality of blades arranged in contacting side-by-side relationship, and drive means for advancing the blades in predetermined sequence.
  • Fig. 1 is a perspective view of one embodiment of cutting tool in accordance with the invention.
  • Fig. 2 is a part-sectional and cut-away view of the front end of the tool of Fig. 1, to an enlarged scale;
  • Fig. 3 is a central vertical section of the tool
  • Fig. 4 is a section on line IV-IV in Fig. 3;
  • Fig. 5 is a vertical section of the front end of the tool to an enlarged scale illustrating diagrammatically successive stages in the action of the tool
  • Figs. 6 A - 6F illustrate various blade configurations in plan view and end elevation.
  • the exemplified hand tool comprises a casing 1 of rigid, moulded synthetic plastics material including an elongate body 2 connected by an integral neck 3 of reduced width to a detachable cutter head 4 with a front opening 5 from which projects a set of six cutting blades 6 together defining a cutting edge 7.
  • the body 2 has a rear opening (not shown) giving access to a battery compartment 8 containing a rechargeable battery 9 which is in electrical connection through a body partition 10 with an electric motor 11 arranged in a motor compartment- 12 closed at its front end by a partition 13 separating the body 2 from the neck 3.
  • the motor 11 is operatively connected to a switch 14 mounted in the wall of the body 2.
  • a drive shaft 15 of the motor 11 extends through the partition 13 to provide the input drive for a transmission 16 housed within the neck 3.
  • the cutter head 4 has a rearward socket portion 17 which is a sliding fit on the neck 3.
  • the catches 18 are slidable in the recesses 19 to permit axial movement of the cutter head 4 relative to the body 2.
  • the front end of the socket portion 17 of the cutter head 4 is defined by an internal shoulder 20 which provides a seat for an elastomeric ring 21 engaged at its other side by the front end of the neck 3.
  • the elastomeric ring 21 acts as a spring urging the cutter head 4 in the forward direction away from the body 2.
  • the catches 18 serve to retain the cutter head 4 on the neck 3 against this spring pressure.
  • Axial retraction movement of the cutter head 4 with respect to the neck 3 is permissible to an extent that may be determined by a suitable stop which can be provided by the engagement of the catches 18 with the rear edges of the recesses 19.
  • a block 24 of elastomeric material which is compressed on forward movement of the blade 6 so as to provide a return force for the blade.
  • the part of the cutting edge 7 provided by the blade 6 is at the front end of a rectilinear bottom edge 25 of the blade 6. The action of the tool in certain applications is facilitated by virtue of the fact that the cutting edge 7, the bottom blade edges 25 and the bottom walls of the cutter head 4, neck 3 and body 2 lie substantially in a common plane.
  • the transmission 16 transmits power from the drive shaft 15 of the motor 11 to the individual blades 6 so as to cause the blades to advance in a predetermined sequence.
  • the shaft 15 is fixed to a bevel gear 26 which meshes with a bevel gear 27 fixed to one end of a rotary cam shaft 28 carrying six cams 29 for driving the respective blades 6.
  • Each cam 29 is of similar irregular shape and the cams are offset on the cam shaft so as to achieve the required sequence of operation of the blades 6.
  • Each cam 29 rotates within an appropriately dimensioned oval opening within a cam follower 30 in the form of a rectangular striker plate mounted for axial sliding movement within the neck 3.
  • the cam configuration is such that the rotary motion of each cam is translated into an abrupt and forceful striking action of each cam follower striker plate against the rear edge of the respective cutter blades 6, as best seen with reference to Fig. 5 illustrating the drive of one blade 6.
  • Fig. 5a the cutter head 4 is in its foremost position with respect to the neck 3 and the body 2 by virtue of the action of the elastomeric ring 21.
  • the blade 6 is likewise in its foremost position with its cutting edge 7 on the final line of cut X.
  • the cutter head 4 is retracted into the position of Fig.
  • the striker plate 30 remains stationary in positions A and B although the cam 29 has turned through a quarter of a revolution in the clockwise direction as indicated by the arrow.
  • the front striking edge 31 is spaced a short distance (for example 2mm) behind the line C and the rear edge 32 of the plate 30 is positioned on line B.
  • the striker plate 30 is abruptly advanced into percussive or striking contact with the rear edge of the blade 6 on the base line C (Fig. 5c) and further movement of the cam 29 (into the position shown in Fig.
  • a manually adjustable stop (not shown) may be provided for arresting the cutter head 4 in such an intermediate position thereby limiting temporarily the cutting force to be applied.
  • Each of the six blades 6 of the cutter head 4 operates in the way described by reference to Fig. 5 but sequentially in a manner determined by the arrangement of the cams 29 on the cam shaft 28.
  • the sequence of blade operations is such that in one angular position of the camshaft all the blades are fully retracted so that the cutting edge 7 is rectilinear and coincident with the initial cutting line Y and in another angular position of the camshaft all the blades 6 are fully extended so that the cutting edge 7 is again rectilinear and coincident with the final cutting line X.
  • the arrangement of the cams . 29 is such that the blades 6 move successively from the retracted to the advanced position with preferably only one blade being subjected to a percussive force at any one time so that the full power of the electric motor 11 is concentrated on an individual blade 6. In such a sequence of operations one blade 6 is first advanced, then the next adjacent blade
  • Figs. 1 to 5 and 6a are of the same size and shape and are held in closely contacting sliding relationships so as to give the appearance of segments of a larger solid blade, of a tool, for example a hand chisel, of the kind for which the power tool of the present invention is intended to substitute.
  • the blades 6 are provided on inside faces thereof with vertical grooves 33 acting as deflectors of dust penetrating between the blades in use.
  • the sliding interconnection of the blades 6 is improved by lengthwise interengaging formations of ribs 34 and grooves 35 on adjacent blade contact faces.
  • the blade configuration illustrated in Figs. 1 to 5 and 6a is that of a typical straight cutter and alternative configurations are illustrated in Fig. 6b (convex cutter), Fig. 6c (concave cutter), Fig. 6d (pointed cutter), Fig. 6e (angled cutter), and Fig. 6f (complex cutter).
  • the blade 6 be grouped partly adjacent to one another to give a virtually unbroken cut along the cutting edge
  • the blades 6 are held in adjacent relationship by lateral compression springs (not shown) at opposite sides of the cutter head 4.
  • lateral compression springs not shown
  • all the blades 6 are preferably of the same width, the number of blades 6 and the overall length of the cutting edge 7 may be varied as desired.
  • the width of the blades is dictated by the power of the drive means and the workpiece material. For example, a powerful motor and a narrow blade will penetrate hard material with ease whereas a wide blade and a weak motor will be suitable only for relatively soft material.
  • the blades may be made of various metals or metal alloys suitably tempered to suit different workpiece materials. The blade displacement may also vary in different applications of the inventive concept.
  • the illustrated transmission may be modified without departing from the scope of the invention.
  • the impact cams may make direct contact with the blades without the intermediary of cam follower plates.
  • the rear ends of the blades may be extended so as to provide cam follower sections driven by the cams in the same way as the illustrated cam follower plates.
  • the cutter head is not adjustable or removable but this may be unimportant particularly in heavy duty cutting tools.
  • the transmission may include more complex gearing between the motor drive and the camshaft.
  • An external power source may be provided in which case the tool of the invention need only comprise a cutter head with cutter blades and a suitable transmission adapted to be connected to the external power source which may for example be a portable electric drill.
  • the illustrated embodiment is provided with a battery it will be appreciated that the motor may be adapted to be driven by mains power.
  • Alternative energy sources e.g. pneumatic power, are also feasible in certain applications.
  • the blades are individually narrow enough to facilitate penetration into the workpiece material in reaction to the weight of the device with a minimum of recoil so that a smooth continuous penetration from successive strokes of adjacent blades is achieved without undue manual pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Harvester Elements (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

Un burin à moteur est pourvu d'un bord coupant (7) formé par une multiplicité de lames (6) juxtaposées, en contact les unes avec les autres. Les lames sont individuellement entraînées par un moteur électrique (11) agissant par l'intermédiaire d'une transmission à cames (29). Les lames sont retenues dans une tête porte-lames (4) qui doit se rétracter contre la charge d'un ressort (24) afin de s'engager avec la transmission. Les lames sont entraînées avec une force percutante et un disque contre-came de percussion (30) peut être ménagé entre chaque came et la lame qui lui est associée.
PCT/GB1991/001029 1990-06-27 1991-06-25 Outil de coupe WO1992000165A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9325989A GB2273258B (en) 1990-06-27 1993-12-20 A cutting tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB909014265A GB9014265D0 (en) 1990-06-27 1990-06-27 A cutting tool

Publications (1)

Publication Number Publication Date
WO1992000165A1 true WO1992000165A1 (fr) 1992-01-09

Family

ID=10678262

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001029 WO1992000165A1 (fr) 1990-06-27 1991-06-25 Outil de coupe

Country Status (3)

Country Link
AU (1) AU8058991A (fr)
GB (2) GB9014265D0 (fr)
WO (1) WO1992000165A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2708508A1 (fr) * 1993-08-02 1995-02-10 Valentin Herve Outil à coins parallèles pour le fendage du bois.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191002371A (en) * 1910-01-31 1911-01-31 Frederick Augustus Grearson Improvements in and relating to Chisels.
NL143574B (nl) * 1948-09-08 1952-11-15 Ici Ltd Werkwijze voor het stabiliseren van een polyalkeen.
EP0024837A1 (fr) * 1979-08-13 1981-03-11 Linear Pneumatics Inc. Procédé pour enlever des parties de joints et outil pneumatique à percussion correspondant
FR2508369A1 (fr) * 1981-06-24 1982-12-31 Atlas Copco Ab Outil a percussion portable dont les vibrations sont amorties
CH644050A5 (en) * 1981-06-19 1984-07-13 Arx Ag Percussion tool for cleaning surfaces - has metal tube cylinder inside injected plastics muff
DE3402010A1 (de) * 1984-01-21 1985-07-25 Gustav 6100 Darmstadt Möckel Von hand zu bedienendes arbeitsgeraet

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191002371A (en) * 1910-01-31 1911-01-31 Frederick Augustus Grearson Improvements in and relating to Chisels.
NL143574B (nl) * 1948-09-08 1952-11-15 Ici Ltd Werkwijze voor het stabiliseren van een polyalkeen.
EP0024837A1 (fr) * 1979-08-13 1981-03-11 Linear Pneumatics Inc. Procédé pour enlever des parties de joints et outil pneumatique à percussion correspondant
CH644050A5 (en) * 1981-06-19 1984-07-13 Arx Ag Percussion tool for cleaning surfaces - has metal tube cylinder inside injected plastics muff
FR2508369A1 (fr) * 1981-06-24 1982-12-31 Atlas Copco Ab Outil a percussion portable dont les vibrations sont amorties
DE3402010A1 (de) * 1984-01-21 1985-07-25 Gustav 6100 Darmstadt Möckel Von hand zu bedienendes arbeitsgeraet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2708508A1 (fr) * 1993-08-02 1995-02-10 Valentin Herve Outil à coins parallèles pour le fendage du bois.
EP0724938A1 (fr) * 1993-08-02 1996-08-07 Hervé Valentin Outil à coins parallèles pour le fendage du bois

Also Published As

Publication number Publication date
GB2273258B (en) 1995-01-04
GB9014265D0 (en) 1990-08-15
GB2273258A (en) 1994-06-15
AU8058991A (en) 1992-01-23
GB9325989D0 (en) 1994-03-16

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