FR2848490A1

FR2848490A1 - Manual striking tool e.g. hammer for sculptor, has spring with rubber to compress cable, which is placed inside shock absorbing system, such that tool supports deformation without altering precision of striking operation

Info

Publication number: FR2848490A1
Application number: FR0215904A
Authority: FR
Inventors: Marc Marcel Gazay
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-12-16
Filing date: 2002-12-16
Publication date: 2004-06-18

Abstract

The tool has a shock absorbing system positioned between a stamp head (1) and a handle (2). A unit has a spring (3) equipped with a rubber material (5) for compressing a cable (6), which is placed inside the system, such that the tool supports the deformation without altering a precision of the striking operation. The cable is connected to a nut (7) for regulating the desired damper.

Description

- 1- 1

DESCRIPTIONDESCRIPTION

La présente invention concerne un outil manuel à percussion équipé d'un système amortisseur de vibrations pour permettre d'atténuer les chocs vibratiles retransmis dans le manche de l'outil manoeuvré par l'utilisateur. The present invention relates to a manual percussion tool equipped with a vibration damping system to attenuate the vibratory shocks retransmitted in the handle of the tool operated by the user.

Tous les outils de frappe tels que marteaux, pioches, raquettes, comportent ^5 traditionnellement une tête corps de frappe et un manche de manoeuvre qui transmet directement les vibrations, d'ou les risques de blesser à la longue les articulations des mains et des bras des professionnels tels que sculpteurs, marbriers, forgerons, tennismen... All striking tools such as hammers, picks, rackets, traditionally have a striking body head and an operating handle which directly transmits vibrations, thereby causing the risk of long-term injury to the joints of the hands and arms professionals such as sculptors, marble workers, blacksmiths, tennis players ...

Ce problème étant connu, plusieurs inventeurs proposent des moyens pour minimiser la transmission de l'impact dans la main de l'utilisateur. Il s'agit notamment des brevets 1 o français N0 8111335; Manche d'outil manuel à percussion, comportant un cadre déformable entouré d'un corps en une matière souple, et d'un autre brevet N'8015475; Manche pour outil de frappe équipé de moyens amortisseurs de vibrations, qui propose un manche composé d'éléments analogues à des vertèbres maintenues par une tige interne. This problem being known, several inventors propose means to minimize the transmission of the impact in the hand of the user. These include, in particular, the French 1 ° patents N0 8111335; Hand percussion tool handle, comprising a deformable frame surrounded by a body of flexible material, and another patent N'8015475; Handle for impact tool equipped with vibration damping means, which offers a handle composed of elements analogous to vertebrae held by an internal rod.

Ces brevets présentent souvent des systèmes qui permettent au manche de fléchir dans une I 5 direction mais pas dans l'autre pour pouvoir conserver la fonction d'arrache clou. Cette contrainte de dissymétrie limite la fonction recherchée, c'est-à-dire d'amortir les chocs quels qu'ils soient. These patents often present systems which allow the handle to flex in one direction but not in the other in order to be able to keep the nail pulling function. This asymmetry constraint limits the desired function, that is to say to absorb shocks whatever they are.

En effet un choc mal positionné peut entraîner des secousses en extrémité de manche dans tous les sens et occasionner des risques de blessures. In fact, a badly positioned shock can cause jolts at the end of the handle in all directions and cause the risk of injury.

L'outil selon l'invention permet de remédier à cet inconvénient. Il comporte en effet entre la tête de frappe et le manche un organe composé au moins d'un ressort à spires équipé d'un élément en matière caoutchouteuse mis en compression par un câble pour que l'outil en action puisse supporter d'importantes déformations sans altérer la précision de manoeuvre. The tool according to the invention overcomes this drawback. It comprises in fact between the striking head and the handle a member composed at least of a coil spring equipped with an element of rubber material put in compression by a cable so that the tool in action can withstand significant deformations without altering the precision of operation.

Ce même ressort, afin d'éliminer les phénomènes de rebondissements répétés, sera enrobé 25 dans une garniture de caoutchouc plus ou moins raide suivant l'amortissement recherché propre à l'outil et à sa fonction. Pour une utilisation universelle, il pourra aussi comprendre au milieu de la partie interne un câble traversant l'ensemble (tête, manche) plus ou moins tendu par vis/écrou suivant le degré d'amortissement désiré. This same spring, in order to eliminate the phenomena of repeated twists and turns, will be coated in a more or less stiff rubber lining depending on the desired damping specific to the tool and to its function. For universal use, it may also include in the middle of the internal part a cable passing through the assembly (head, handle) more or less stretched by screw / nut according to the desired degree of damping.

La réalisation pourra s'effectuer en utilisant soit des ressorts métalliques courant du 30 commerce soit des ressorts spécifiques en fibre de carbone. Pour cette dernière, nous dirons que le mariage de plusieurs plastiques tels que fibre de carbone, fibre de verre (pour le manche, l'embout compris dans l'oeil de la tête de frappe, le câble) et le caoutchouc, forment un ensemble en matériaux composites. -2 The realization may be carried out using either conventional metal springs on the market or specific carbon fiber springs. For the latter, we will say that the marriage of several plastics such as carbon fiber, fiberglass (for the handle, the tip included in the eye of the striking head, the cable) and rubber, form a whole in composite materials. -2

L'invention est à présent décrite plus en détail en regard des dessins annexés à titre d'exemples non limitatifs et sur lesquels: - La figure 1 représente en coupe l'outil selon l'invention. The invention is now described in more detail with reference to the accompanying drawings by way of nonlimiting examples and in which: - Figure 1 shows in section the tool according to the invention.

- La figure 2 représente en coupe A le détail de l'extrémité du manche. L'outil représenté sur la figure 1 comporte entre la tête de frappe (1) et le manche (2) un organe élastique composé d'un ressort à spires plus ou moins jointives (3) lié d'un côté à un embout (4) emmanché en force dans l'oeil de la tête de frappe (1) et de l'autre lié au manche directement. Suivant le matériau utilisé, métallique ou plastique, la jonction s'effectue par collage ou soudure. - Figure 2 shows in section A the detail of the end of the handle. The tool represented in FIG. 1 comprises between the striking head (1) and the handle (2) an elastic member composed of a spring with more or less contiguous turns (3) linked on one side to a nozzle (4 ) force-fitted into the eye of the striking head (1) and of the other directly linked to the handle. Depending on the material used, metallic or plastic, the connection is made by gluing or welding.

A l'intérieur du ressort une matière caoutchouteuse plus ou moins dure (5) rempli l'espace tout en laissant passer dans sa partie centrale un câble (6). Ce câble, suivant la figure 2, comprend à une extrémité un cône (10) serti qui a pour rôle, par expansion de l'embout (4), de maintenir celuici bien solidaire de la tête de frappe (1). L'autre extrémité du câble, , représente le système vis/écrou (7) pour la mise sous tension du câble permettant de maintenir plus ou moins les spires du ressort jointives. La vis proprement dite (8) contient un corps serti sur le câble (6) de section carrée pour le maintenir en position quelque soit l'action de rotation imposée l'écrou (9) manoeuvré par une clef. t * - 3 Inside the spring a more or less hard rubbery material (5) fills the space while allowing a cable (6) to pass through its central part. This cable, according to FIG. 2, comprises at one end a crimped cone (10) which has the role, by expansion of the end piece (4), of keeping it securely attached to the striking head (1). The other end of the cable,, represents the screw / nut system (7) for tensioning the cable allowing more or less to maintain the contiguous coils of the spring. The actual screw (8) contains a body crimped on the cable (6) of square section to maintain it in position whatever the rotation action imposed the nut (9) operated by a key. t * - 3

Claims

- CLAIMS

10) Manual percussion tool equipped with a shock absorbing system, characterized in that it comprises between the striking head (1) and the handle (2) a member composed at least of a spring (3) equipped with 'An element of rubbery material (5) put in compression by a cable (6) so that the tool in action can withstand significant deformations without 85 affecting the precision of the striking operation.

20) Manual tool according to claim 1, characterized in that the spring with more or less contiguous turns (3) is fitted and glued to the handle.

30) Manual tool according to claims let 2, characterized in that the striking head (1) comprises in its eye a tip (4) forced fitting, which tip extends to be 1i0 nested in the spring (3) and secured by gluing or welding depending on the nature of the materials. 40) Manual tool according to any one of the preceding claims, characterized in that the spring (3) is coated in a rubbery material (5) more or less rigid depending on the damping sought for the function of the tool.

1 5 5) manual tool according to any one of the preceding claims, characterized in that it is traversed in its internal part by a cable (6) integral with the end piece (4) and tensioned by a screw / nut system ( 7) at the end of the handle for adjusting the damping.

6) A manual tool according to claim 5, characterized in that the cable (6) at one of its ends is crimped in a cone (10) whose function is to promote the expansion of the end piece (4) for the maintain integral with the striking head (1).

70) Manual tool according to claims 5 and 6, characterized in that, in the screw / nut system (7), the cable (6) is crimped in the body of the screw (8) whose square section allows to keep the position whatever the rotation action imposed by the nut (9) operated by a key.

80) Manual tool according to any one of the preceding claims, characterized in that the whole of the tool can consist partially or entirely of metal and / or composite materials using plastic, carbon fiber and / or glass.

90) Manual tool according to any one of the preceding claims, characterized in that it can be applied to striking tools such as hammers, picks, racket.