EP0551549A1 - Handle for hand-tool with protective head - Google Patents

Handle for hand-tool with protective head Download PDF

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Publication number
EP0551549A1
EP0551549A1 EP92100736A EP92100736A EP0551549A1 EP 0551549 A1 EP0551549 A1 EP 0551549A1 EP 92100736 A EP92100736 A EP 92100736A EP 92100736 A EP92100736 A EP 92100736A EP 0551549 A1 EP0551549 A1 EP 0551549A1
Authority
EP
European Patent Office
Prior art keywords
handle
head
wooden body
handle according
wood
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Withdrawn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
EP92100736A
Other languages
German (de)
French (fr)
Inventor
Bernard Prouteau
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.)
SICFO Stanley SA
Original Assignee
SICFO Stanley SA
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 SICFO Stanley SA filed Critical SICFO Stanley SA
Priority to EP92100736A priority Critical patent/EP0551549A1/en
Publication of EP0551549A1 publication Critical patent/EP0551549A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/10—Handle constructions characterised by material or shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D3/00—Hand chisels

Definitions

  • the present invention relates to an improvement in the handle for a hand tool, in particular wood chisels, gouges or chisels of the type comprising a wooden body and a protective head mounted on and in extension of the body.
  • wood chisels, gouges and chisels are composed of a hardened steel blade with a sharp part at one end. At the other end, this blade has a recessed part called "silk" intended to receive a handle generally made of hard wood or plastic.
  • These tools are used by hitting the end of the handle with a mallet or with the palm of your hand.
  • the plastic handles offer good impact resistance but are often slippery and less pleasant to touch than wood.
  • Wood has the disadvantage of splitting and flourishing under the repeated impact of the mallet, which makes use with the palm of the hand unpleasant and sometimes dangerous, due to the risk of splinters in the hand.
  • the object of the improvement according to the invention is to overcome these drawbacks and to propose a protective head with perfect attachment to the wooden body whatever the influence of the atmosphere. This object is achieved with a handle for a hand tool as described in claim 1.
  • FIG. 1 a wood chisel, (1) composed of a hardened steel blade, (2) having a sharp part. At the other end, this blade has a recessed part called “silk” intended to receive a handle (3).
  • This handle consists of a wooden body (4) and a head (5) mounted on and in the extension of the wooden body. As already explained above, this head prevents the wood from splitting and flourishing under the repeated impacts of a mallet.
  • Figure 2 shows the protective head, and therefore the end of the wooden body on which the head is mounted, in section along the central axis X-X of the tool.
  • the head has a central cylindrical part 7, fitted into a bore 6 drilled in the wooden body 4 to the corresponding dimensions.
  • This cylindrical part 7 is forced into this bore 6.
  • the generator of the cylindrical body is provided with grooves 8.
  • the fixing by means of this cylindrical part of the head 5 is all the more tight as the wood shrinks, for example by drying.
  • the material of the protective head 5 is a plastic of the polypropylene more elastomer type having great dimensional stability under the effect of hygrometric or thermal variations.
  • the wood of the body 4 absorbs moisture, which leads to considerable expansion in all dimensions, particularly perpendicular to the orientation of the wood fibers, and causes an enlargement of the bore 6 with the risk of formation of a play or a less tight impact between the cylindrical part 7 of the protective head 5 and the wooden body 4.
  • the protective head is provided, at its periphery, with a skirt 9 covering part of the end of the body in wood.
  • the outer surface of this skirt 9 merges with the extension of the surface of the wooden body.
  • the inner surface of said skirt 9 is in contact with a cylindrical seat 10 of the same diameter formed by a bearing surface 11 in the end of the wooden body 4. Since the material of the protective head 5 does not not expands under the effect of hygrometric variations, an expansion of the wood increases the clamping force at the level of the interior surface of said skirt 9 and of its seat 10 at the end of the wooden body 4.
  • handle shapes 3 other than symmetrical in rotation about the central axis X-X of the tool, such as for example oval, rectangular or hexagonal shapes with rounded corners.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)

Abstract

The present invention relates to a handle for a hand tool, particularly wood chisels, gouges and chisels of the type including a wooden body (4) and a head (5) mounted on and in the extension of the body. It is characterised in that the head (5) includes first insertion members (9), which means that the clamping force increases with an expansion of the wooden body (4), and the second insertion members (7) which clamp even more than the wooden body (4) shrinks due to the differences in hygrometric and/or thermal variations. <IMAGE>

Description

La présente invention a pour objet un perfectionnement de poignée pour outil à main, notamment des ciseaux à bois, gouges ou bédanes du type comportant un corps en bois et une tête de protection montée sur et dans le prolongement du corps.
Traditionnellement les ciseaux à bois, gouges et bédanes sont composés d'une lame en acier trempé comportant une partie tranchante à une extrémité. À l'autre extrémité cette lame comporte une partie amaincie appelée "soie" destinée à recevoir une poignée généralement en bois dur ou en matière plastique. L'utilisation de ces outils se fait en frappant sur l'extrémité de la poignée au moyen d'un maillet ou avec la paume de la main. Les manches en matière plastique offrent une bonne résistance au choc mais sont souvent glissants et d'un contact moins agréable que le bois.The present invention relates to an improvement in the handle for a hand tool, in particular wood chisels, gouges or chisels of the type comprising a wooden body and a protective head mounted on and in extension of the body.
Traditionally, wood chisels, gouges and chisels are composed of a hardened steel blade with a sharp part at one end. At the other end, this blade has a recessed part called "silk" intended to receive a handle generally made of hard wood or plastic. These tools are used by hitting the end of the handle with a mallet or with the palm of your hand. The plastic handles offer good impact resistance but are often slippery and less pleasant to touch than wood.

Le bois à l'inconvénient de se fendre et de s'épanouir sous l'impact répété du maillet, ce qui rend l'utilisation avec la paume de la main désagréable et parfois dangereuse, en raison des risques d'écharde dans la main.Wood has the disadvantage of splitting and flourishing under the repeated impact of the mallet, which makes use with the palm of the hand unpleasant and sometimes dangerous, due to the risk of splinters in the hand.

Le perfectionnement suivant l'invention a pour but de pallier à ces inconvénients et de proposer une tête de protection avec une parfaite fixation sur le corps en bois quelque soit l'influence d'ambiance.
Ce but est atteint avec une poignée pour outil à main telle qu'elle est décrite dans la revendication 1.The object of the improvement according to the invention is to overcome these drawbacks and to propose a protective head with perfect attachment to the wooden body whatever the influence of the atmosphere.
This object is achieved with a handle for a hand tool as described in claim 1.

Les revendications dépendantes décrivent les caractéristiques des différents modes de réalisation préférés.The dependent claims describe the features of the various preferred embodiments.

La coexistance, d'une part des éléments d'emmanchement assurant la parfaite fixation de la tête de protection sur le corps en bois dans le cas où le bois se rétrécit, en raison par exemple d'une diminution du taux d'humidité ambiante, et d'autre part des éléments de fixation qui serrent le tête de protection sur le corps en bois lorsque le bois se dilate à cause d'une humidité accrue, fait que la tête de protection sera toujours parfaitement fixée sur le corps en bois quelles que soient les variations dimensionnelles de ce dernier dues aux différentes variations hygrométriques.The coexistence, on the one hand of the fitting elements ensuring the perfect fixing of the protective head on the wooden body in the case where the wood shrinks, for example due to a decrease in the ambient humidity rate, and on the other hand fixing elements which tighten the protective head on the wooden body when the wood expands due to increased humidity, so that the protective head will always be perfectly fixed on the wooden body whatever the dimensional variations of the latter due to the different hygrometric variations.

D'autres caractéristiques et avantages de l'invention seront mieux compris à la lecture de la description qui va suivre d'un mode de réalisation ainsi qu'en se référant aux dessins annexés, sur lesquels:

la figure 1
correspond à une vue en perspective d'un outil à main avec une poignée suivant l'invention; et
la figure 2
est une coupe effectuée le long de l'axe central de l'outil au niveau de la tête de protection.
Other characteristics and advantages of the invention will be better understood on reading the following description of an embodiment as well as with reference to the appended drawings, in which:
figure 1
corresponds to a perspective view of a hand tool with a handle according to the invention; and
figure 2
is a cut made along the central axis of the tool at the level of the protective head.

Sur la figure 1 est représenté un ciseau à bois, (1) composé d'une lame en acier trempé, (2) comportant une partie tranchante. À l'autre extrémité, cette lame possède une partie amaincie appelée "soie" destinée à recevoir une poignée (3). Cette poignée est constituée par un corps (4) en bois et une tête (5) montée sur et dans le prolongement du corps en bois. Comme il a déjà été expliqué précédemment, cette tête empêche le bois de se fendre et de s'épanouir sous les impacts répétés d'un maillet.In Figure 1 is shown a wood chisel, (1) composed of a hardened steel blade, (2) having a sharp part. At the other end, this blade has a recessed part called "silk" intended to receive a handle (3). This handle consists of a wooden body (4) and a head (5) mounted on and in the extension of the wooden body. As already explained above, this head prevents the wood from splitting and flourishing under the repeated impacts of a mallet.

La figure 2 montre la tête de protection, et donc l'extrémité du corps en bois sur laquelle la tête est montée, en coupe le long de l'axe central X-X de l'outil.Figure 2 shows the protective head, and therefore the end of the wooden body on which the head is mounted, in section along the central axis X-X of the tool.

On voit que la tête comporte une pièce cylindrique 7 centrale, emmanchée dans un alèsage 6 percé dans le corps en bois 4 aux dimensions correspondantes. Cette partie cylindrique 7 est introduite en force dans cet alésage 6. Pour augmenter la friction avec les paroies de l'alésage, la génératrice du corps cylindrique est pourvue de cannelures 8. La fixation par l'intermédiaire de cette partie cylindrique de la tête 5 est d'autant plus serrée que le bois retrécit, par exemple en séchant. Le matériau de la tête de protection 5 est un plastique du type polypropylène plus élastomère ayant une grande stabilité de dimension sous l'effet des variations hygrométriques ou thermiques.We see that the head has a central cylindrical part 7, fitted into a bore 6 drilled in the wooden body 4 to the corresponding dimensions. This cylindrical part 7 is forced into this bore 6. To increase the friction with the walls of the bore, the generator of the cylindrical body is provided with grooves 8. The fixing by means of this cylindrical part of the head 5 is all the more tight as the wood shrinks, for example by drying. The material of the protective head 5 is a plastic of the polypropylene more elastomer type having great dimensional stability under the effect of hygrometric or thermal variations.

Dans un milieu ambiant humide le bois du corps 4 absorbe l'humidité ce qui conduit à une dilatation considérable dans toutes les dimensions, particulièrement perpendiculairement à l'orientation des fibres de bois, et entraine un agrandissement de l'alésage 6 avec le risque de formation d'un jeu ou d'un impact moins serré entre la partie cylindrique 7 de la tête de protection 5 et le corps en bois 4.In a humid ambient environment, the wood of the body 4 absorbs moisture, which leads to considerable expansion in all dimensions, particularly perpendicular to the orientation of the wood fibers, and causes an enlargement of the bore 6 with the risk of formation of a play or a less tight impact between the cylindrical part 7 of the protective head 5 and the wooden body 4.

Afin d'assurer une parfaite fixation de la tête de protection, également dans le cas d'une dilatation du bois, la tête de protection est pourvue, à sa périphérie, d'une jupe 9 coiffant une partie de l'extrémité du corps en bois. La surface extérieure de cette jupe 9 se confond avec le prolongement de la surface du corps en bois. La surface intérieure de la dite jupe 9 est en contact avec un siège cylindrique 10 du même diamètre formé par une surface d'appui 11 dans l'extrémité du corps en bois 4. Étant donné que le matériau de la tête de protection 5 ne se dilate pas sous l'effet des variations hygrométriques, une dilatation du bois augmente la force de serrage au niveau de la surface intérieure de la dite jupe 9 et de son siège 10 à l'extrémité du corps en bois 4.In order to ensure perfect attachment of the protective head, also in the case of expansion of the wood, the protective head is provided, at its periphery, with a skirt 9 covering part of the end of the body in wood. The outer surface of this skirt 9 merges with the extension of the surface of the wooden body. The inner surface of said skirt 9 is in contact with a cylindrical seat 10 of the same diameter formed by a bearing surface 11 in the end of the wooden body 4. Since the material of the protective head 5 does not not expands under the effect of hygrometric variations, an expansion of the wood increases the clamping force at the level of the interior surface of said skirt 9 and of its seat 10 at the end of the wooden body 4.

Quelque soit la variation dimensionnelle du corps en bois 4 due aux différentes variations hygrométriques ou thermiques, la fixation parfaite de la tête de protection 5 est toujours assurée.Whatever the dimensional variation of the wooden body 4 due to the different hygrometric or thermal variations, the perfect fixing of the protective head 5 is always ensured.

Bien entendu la description n'est pas limitative et l'homme de l'art pourrait y apporter des modifications sans sortir pour autant du domaine de l'invention. Il est par exemple, également possible de donner à la surface intérieure de la jupe 9, ainsi qu'à la surface correspondante de son siége 10 à l'extrémité du corps en bois 4, une forme frustro-cônique avec une orientation de la base du cône vers le bout arrière de la poignée.Of course the description is not limitative and the person skilled in the art could make modifications without going out however within the scope of the invention. It is for example, also possible to give the inner surface of the skirt 9, as well as the corresponding surface of its seat 10 at the end of the wooden body 4, a frustro-conical shape with an orientation of the base from the cone to the rear end of the handle.

En outre, il est tout à fait possible d'utiliser des formes de poignée 3 autres que symétriques en rotation autour de l'axe central X-X de l'outil, comme par exemple des formes ovales, rectangulaires ou hexagonales avec coins arrondis.In addition, it is entirely possible to use handle shapes 3 other than symmetrical in rotation about the central axis X-X of the tool, such as for example oval, rectangular or hexagonal shapes with rounded corners.

Claims (7)

poignée pour outil à main, notamment ciseaux à bois, gouges et bédanes du type de ceux qui comportent un corps en bois (4) et une tête (5) montée sur et dans le prolongement du corps,
caractérisée en ce que
la tête (5) comporte des premiers éléments d'emmanchement (9), ce qui fait que la force de serrage augmente avec une dilatation du corps en bois (4) et les seconds éléments d'emmanchement (7) qui serrent d'autant plus que le corps en bois (4) rétrécit en raison des différences de variations hygrométriques et/ou thermiques.handle for hand tool, in particular wood chisels, gouges and chisels of the type comprising a wooden body (4) and a head (5) mounted on and in extension of the body,
characterized in that
the head (5) comprises first fitting elements (9), which means that the clamping force increases with expansion of the wooden body (4) and the second fitting elements (7) which tighten as much more than the wooden body (4) shrinks due to differences in humidity and / or temperature variations. Poignée suivant la revendication 1,
caractérisée en ce que
le premier élément d'emmanchement est constitué par une jupe (9) périphérique de la tête (5) qui se fixe autour d'une partie siège (10) du corps en bois (4), lui correspondant.Handle according to claim 1,
characterized in that
the first fitting element is constituted by a skirt (9) peripheral to the head (5) which is fixed around a seat part (10) of the wooden body (4), corresponding to it. Poignée suivant la revendication 1 ou 2,
caractérisée en ce que
le second élément d'emmanchement est constitué par une pièce cylindrique (7) dont l'axe se confond avec l'axe central de l'outil X-X, la pièce cylindrique (7) étant reliée à la partie du fond de la tête (5) et emmanchée en force dans un alésage (6) percé dans le corps en bois (4).Handle according to claim 1 or 2,
characterized in that
the second fitting element consists of a cylindrical part (7) whose axis merges with the central axis of the tool XX, the cylindrical part (7) being connected to the part of the bottom of the head (5 ) and force-fitted into a bore (6) drilled in the wooden body (4). Poignée suivant une des revendications 1 à 3,
caractérisée en ce que
les surfaces des éléments d'emmanchement (6,9)en contact avec le bois sont cannelées.Handle according to one of Claims 1 to 3,
characterized in that
the surfaces of the fitting elements (6,9) in contact with the wood are grooved. Poignée suivant une des revendications précédentes,
caractérisée en ce que
le materiau de la tête (5) de la poignée (3) est en matière plastique incassable du type composite polypropylène plus élastomère.Handle according to one of the preceding claims,
characterized in that
the material of the head (5) of the handle (3) is in unbreakable plastic material of the polypropylene plus elastomer composite type. Poignée suivant la revendication 5,
caractérisée en ce que
le matériau de la tête (5) de la poignée (3) possède une bonne mémoire élastique.Handle according to claim 5,
characterized in that
the material of the head (5) of the handle (3) has a good elastic memory. Poignée suivant la revendication 2,
caractérisée en ce que
le logement (10) de la jupe (9) périphérique sur le corps en bois, ainsi que la forme de la surface intérieure de la jupe (9) sont légèrement frustro-côniques avec une base orientée vers le bout de la poignée (3).Handle according to claim 2,
characterized in that
the housing (10) of the peripheral skirt (9) on the wooden body, as well as the shape of the internal surface of the skirt (9) are slightly frustro-conical with a base oriented towards the end of the handle (3) .
EP92100736A 1992-01-17 1992-01-17 Handle for hand-tool with protective head Withdrawn EP0551549A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92100736A EP0551549A1 (en) 1992-01-17 1992-01-17 Handle for hand-tool with protective head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92100736A EP0551549A1 (en) 1992-01-17 1992-01-17 Handle for hand-tool with protective head

Publications (1)

Publication Number Publication Date
EP0551549A1 true EP0551549A1 (en) 1993-07-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92100736A Withdrawn EP0551549A1 (en) 1992-01-17 1992-01-17 Handle for hand-tool with protective head

Country Status (1)

Country Link
EP (1) EP0551549A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LT5358B (en) 2004-11-08 2006-08-25 Vilniaus Gedimino technikos universitetas Improved chisel mortiser
EP1932628A1 (en) * 2006-12-13 2008-06-18 Ing. Johann HÖRTNAGL-WERKZEUGE Ges.m.b.H Trowel with wood-plastic grip
USD921465S1 (en) 2019-05-06 2021-06-08 Milwaukee Electric Tool Corporation Mortar knife
USD922842S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD922840S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD922841S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD923447S1 (en) 2019-05-06 2021-06-29 Milwaukee Electric Tool Corporation Chisel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191323000A (en) * 1913-10-11 1914-01-15 Donald Mcneil Improvements in and relating to Chisels and like Cutting Tools.
US1604007A (en) * 1926-03-10 1926-10-19 Wigren Frank Jones Tool
US2475041A (en) * 1946-02-25 1949-07-05 Joseph M Mattson Percussive type wood chisel
DE3217788A1 (en) * 1982-05-12 1983-11-24 Felo Holland-Letz GmbH & Co KG, 3577 Neustadt Striking cap
US4535649A (en) * 1983-01-28 1985-08-20 Drag Specialties, Inc. Anti-slip handlebar grip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191323000A (en) * 1913-10-11 1914-01-15 Donald Mcneil Improvements in and relating to Chisels and like Cutting Tools.
US1604007A (en) * 1926-03-10 1926-10-19 Wigren Frank Jones Tool
US2475041A (en) * 1946-02-25 1949-07-05 Joseph M Mattson Percussive type wood chisel
DE3217788A1 (en) * 1982-05-12 1983-11-24 Felo Holland-Letz GmbH & Co KG, 3577 Neustadt Striking cap
US4535649A (en) * 1983-01-28 1985-08-20 Drag Specialties, Inc. Anti-slip handlebar grip

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LT5358B (en) 2004-11-08 2006-08-25 Vilniaus Gedimino technikos universitetas Improved chisel mortiser
EP1932628A1 (en) * 2006-12-13 2008-06-18 Ing. Johann HÖRTNAGL-WERKZEUGE Ges.m.b.H Trowel with wood-plastic grip
USD921465S1 (en) 2019-05-06 2021-06-08 Milwaukee Electric Tool Corporation Mortar knife
USD922842S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD922840S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD922841S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD923447S1 (en) 2019-05-06 2021-06-29 Milwaukee Electric Tool Corporation Chisel
USD937650S1 (en) 2019-05-06 2021-12-07 Milwaukee Electric Tool Corporation Chisel
USD938249S1 (en) 2019-05-06 2021-12-14 Milwaukee Electric Tool Corporation Chisel
USD941113S1 (en) 2019-05-06 2022-01-18 Milwaukee Electric Tool Corporation Chisel

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