EP0412030A1 - Device for protection of a handle of a percussive tool and its method of placement - Google Patents

Device for protection of a handle of a percussive tool and its method of placement Download PDF

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Publication number
EP0412030A1
EP0412030A1 EP90420368A EP90420368A EP0412030A1 EP 0412030 A1 EP0412030 A1 EP 0412030A1 EP 90420368 A EP90420368 A EP 90420368A EP 90420368 A EP90420368 A EP 90420368A EP 0412030 A1 EP0412030 A1 EP 0412030A1
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EP
European Patent Office
Prior art keywords
handle
ring
tool
elastic
fitted
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Withdrawn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
EP90420368A
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German (de)
French (fr)
Inventor
Charles Moulin
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.)
Forges de la Loire Et De Milourd Moulin Blanc Ets SA
Original Assignee
Forges de la Loire Et De Milourd Moulin Blanc Ets 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 Forges de la Loire Et De Milourd Moulin Blanc Ets SA filed Critical Forges de la Loire Et De Milourd Moulin Blanc Ets SA
Publication of EP0412030A1 publication Critical patent/EP0412030A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D1/00—Hand hammers; Hammer heads of special shape or materials

Definitions

  • the object of the present invention is to remedy these disadvantages by providing a protection device avoiding any accidental deterioration of a wooden handle which is inexpensive to produce, to put in place and applicable to all handles, and to all striking tools without any modification thereof.
  • the ring is made of flexible and deformable material, and is mounted with elastic clamping on the only conical part of the end of the handle, so that after fitting on the tool and adjusting the longitudinal position of this ring, adjustment resulting in a radial deformation of the latter and an increase in its elastic tightening on the handle, its upper face being in contact with the lower face of the striking tool.
  • This ring which is mounted on the handle before engagement of the latter in the eye of the striking tool, is definitively positioned and linked by tightening, during assembly of the striking tool on the handle, and therefore comes perfectly in contact with the underside of this tool. Under these conditions, if the user has poor control over the path of his tool and strikes with the part of the handle juxtaposed with the tool, the striking force is largely absorbed by the ring, which avoids damaging the fibers. wood constituting the underlying handle.
  • the ring comprises, in its part coming against the underside of the tool, a flared collar.
  • This collar forms a ramp which, in contact with an external surface, displaces the hammer longitudinally and therefore moves the impact receiving region away from the embedding of the handle in the tool.
  • the head ring is associated with a foot ring which, made of flexible material, is fitted with elastic clamping on the foot of the handle, and is secured to a transverse protective wall giving it the shape of a headdress.
  • the handle 2 generally designates the handle of a hammer 3.
  • the handle 2 comprises, in its fitting area called "straight", a part 5 with inclined generatrices giving it a conical shape of weak taper flaring towards the body.
  • the eye 6 of the mass 3 of the hammer it has, as shown in cross section in Figure 2, a biconical shape diverging outward.
  • the handle 2 before it is mounted in the eye 6, the handle 2 receives, on its conical part 5, a protective ring 7 made of flexible and elastically deformable synthetic material. This ring is force fitted on it and so that its upper face 7a is substantially at the level that the lower face 3a of the mass of the hammer will occupy.
  • part 5 of the handle into the eye 6 of the hammer, raw manufacturing eye.
  • This part shrinks locally to ensure by elastic tightening the neck-mass connection.
  • the face 3a comes into contact with the face 7a of the ring 7, face 7a which tends to move this ring towards the base of the handle 2 causing its radial deformation, improving the elastic clamping thereof on the handle.
  • the fitting is finished.
  • the ring externally has a generally cylindrical shape with elliptical or oblong section.
  • it has the same shape but in addition is integral, in its part coming against the underside 3a of the mass, a flared collar 9 which improves protection in this area.
  • this collar displaces the tool in the event of a strike on the handle, so that the shock zone is offset opposite the fitting zone, that is to say is offset relative to the face 3a of the tool.
  • the protective ring 7 is advantageously used in combination with a foot ring 10 which, like it, is made of flexible and elastic material, and is fitted with elastic clamping on the foot of the handle 2.
  • This ring is integral with a transverse wall loa, giving it the shape of a cap.
  • the foot ring protects the foot from the handle and prevents its fibers from disintegrating and forming scales, when the operator uses this foot of the handle to strike on parts being adjusted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

This device is intended for a percussive tool whose handle comprises a so-called straight end, that is to say formed from a conical section of slight conicity capable of being fitted tightly into the biconical hole of the rough forged tool. It is of the type constituted by a ring of elastic material. According to the invention, the ring is made from flexible and deformable material, and is fitted with elastic tightness on the conical section (5) alone of the end of the handle in such a way that, after fitting on the tool and adjustment of the longitudinal position of this ring, an adjustment resulting in a radial deformation of the latter and an increase of its elastic tightening on the handle, its upper face is in contact with the lower face (3a) of the percussive tool (3).

Description

Il est connu que la majorité des accidents du travail causés par des outils à main sont provoqués par des outils de frappe, en raison soit d'une mauvaise utilisation, soit d'une rupture ou désolidarisation du manche avec l'outil.It is known that the majority of industrial accidents caused by hand tools are caused by striking tools, either due to improper use, or to a break or separation of the handle with the tool.

Si les problèmes de liaison du manche avec la masse sont maintenant parfaitement résolus, par exemple en utilisant des coins métalliques de coïncement et une résine synthétique d'obturation de l'oeil pour empêcher la désication du manche, aucune solution n'a été apportée à ce jour à la protection du manche en bois pour éviter sa rupture ou sa détérioration. Pourtant il n'est pas rare, par exemple avec un marteau, qu'en essayant de frapper sur un outil, tel qu'une broche, l'utilisateur maitrise mal la trajectoire de la masse et frappe sur la broche avec le sommet du manche, à la base de la masse, au lieu de frapper avec la masse. La répétition de tels incidents casse les fibres constitutives du manche et favorise sa rupture ultérieure. Enfin, dans certaines activités, il est d'usage d'enfoncer des pièces en cours d'ajustement en frappant sur elles, non pas avec la masse, mais avec le pied du manche pour ne pas détériorer ces pièces. Cette technique a pour inconvénient, si la pièce frappée résiste à l'enfoncement, de favoriser l'écartement des fibres du pied, et de former des écailles de bois pouvant blesser l'utilisateur.If the problems of connection of the handle with the mass are now perfectly solved, for example by using metallic wedges of coincidence and a synthetic resin for filling the eye to prevent the desication of the handle, no solution has been found to this day to protect the wooden handle to prevent it from breaking or deteriorating. However, it is not uncommon, for example with a hammer, that when trying to strike a tool, such as a spindle, the user has little control over the mass path and strikes the spindle with the top of the handle , at the base of the mass, instead of striking with the mass. The repetition of such incidents breaks the constituent fibers of the handle and promotes its subsequent rupture. Finally, in certain activities, it is customary to drive in parts that are being adjusted by striking them, not with the mass, but with the foot of the handle so as not to damage these parts. This technique has the drawback, if the impacted part resists sinking, of favoring the separation of the fibers of the foot, and of forming wooden scales which can injure the user.

On connait déjà un dispositif de protection mettant en oeuvre une bague, métallique ou en matière synthétique élastique, engagée dans l'oeil de la masse et dans laquelle s'emmanche le manche. Une telle bague, dont la fonction est d'augmenter la longueur d'emmanchement, est onéreuse à réaliser et augmente le coût du montage. Dans certains cas, et en particulier dans DE-A-1 301 779, elle oblige à réaliser l'oeil de la masse et le manche avec des formes et dimensions différentes de celles normalisées, ce qui augmente le coût de fabrication. De ce fait, ce dispositif est limité dans son application aux marteaux de faible hauteur, tels que marteaux serrurier de type allemand et aux marteaux travaillant comme arrache-clou, tels que marteaux bourgeois.There is already known a protective device using a ring, metallic or elastic synthetic material, engaged in the eye of the mass and in which the handle is fitted. Such a ring, the function of which is to increase the fitting length, is expensive to produce and increases the cost of assembly. In some cases, and in particular in DE-A-1 301 779, it requires the eye of the mass and the handle to be produced with shapes and dimensions different from those standardized, which increases the manufacturing cost. As a result, this device is limited in its application to hammers of low height, such as locksmith hammers of the German type and to hammers working as a nail puller, such as bourgeois hammers.

La présente invention a pour but de remédier à ces inconvénients en fournissant un dispositif de protection évitant toute détérioration accidentelle d'un manche en bois qui soit peu onéreux à réaliser, à mettre en place et applicable à tous les manches, et à tous les outils de frappe sans aucune modification de ceux-ci.The object of the present invention is to remedy these disadvantages by providing a protection device avoiding any accidental deterioration of a wooden handle which is inexpensive to produce, to put in place and applicable to all handles, and to all striking tools without any modification thereof.

Selon l'invention, la bague est réalisée en matériau souple et déformable, et est montée avec serrage élastique sur la seule partie conique de l'extrémité du manche, de manière, qu'après emmanchement sur l'outil et ajustement de la position longitudinale de cette bague, ajustement entraînant une déformation radiale de celel-ci et une augmentation de son serrage élastique sur le manche, sa face supérieure soit en contact avec la face inférieure de l'outil de frappe.According to the invention, the ring is made of flexible and deformable material, and is mounted with elastic clamping on the only conical part of the end of the handle, so that after fitting on the tool and adjusting the longitudinal position of this ring, adjustment resulting in a radial deformation of the latter and an increase in its elastic tightening on the handle, its upper face being in contact with the lower face of the striking tool.

Cette bague, qui est montée sur le manche avant engagement de celui-ci dans l'oeil de l'outil de frappe, est définitivement positionnée et liée par serrage, lors du montage de l'outil de frappe sur le manche, et vient donc parfaitement en contact avec la face inférieure de cet outil. Dans ces conditions, si l'utilisateur maitrise mal la trajectoire de son outil et vient frapper avec la partie du manche juxtaposée à l'outil, l'effort de frappe est en grande partie absorbé par la bague, ce qui évite de détériorer les fibres du bois constituant le manche sous-jacent.This ring, which is mounted on the handle before engagement of the latter in the eye of the striking tool, is definitively positioned and linked by tightening, during assembly of the striking tool on the handle, and therefore comes perfectly in contact with the underside of this tool. Under these conditions, if the user has poor control over the path of his tool and strikes with the part of the handle juxtaposed with the tool, the striking force is largely absorbed by the ring, which avoids damaging the fibers. wood constituting the underlying handle.

Dans une forme d'exécution préférée, la bague comporte, dans sa partie venant contre la face inférieure de l'outil, un collet évasé.In a preferred embodiment, the ring comprises, in its part coming against the underside of the tool, a flared collar.

Ce collet forme une rampe qui, au contact avec une surface extérieure, déplace longitudinalement le marteau et éloigne donc la zone de réception du choc du ras de l'encastrement du manche dans l'outil.This collar forms a ramp which, in contact with an external surface, displaces the hammer longitudinally and therefore moves the impact receiving region away from the embedding of the handle in the tool.

Dans une forme d'exécution de l'invention, la bague de tête est associée à une bague de pied qui, réalisée en matériau souple, est emmanchée avec serrage élastique sur le pied du manche, et est solidaire d'une paroi transversale de protection lui donnant la forme d'une coiffe.In one embodiment of the invention, the head ring is associated with a foot ring which, made of flexible material, is fitted with elastic clamping on the foot of the handle, and is secured to a transverse protective wall giving it the shape of a headdress.

D'autres caractéristiques et avantages ressortiront de la description qui suit en référence au dessin schématique annexé représentant deux formes d'exécution de ce dispositif dans le cadre de son application à un manche de marteau.

  • Figure 1 est une vue de côté avec coupe partielle d'une première forme d'exécution de ce dispositif,
  • Figure 2 est une vue de côté avec coupe partielle montrant la bague de tête lors de son emmanchage dans le marteau,
  • Figure 3 est une vue de côté montrant une autre forme d'exécution de ce dispositif.
Other characteristics and advantages will emerge from the description which follows with reference to the appended schematic drawing representing two embodiments of this device within the framework of its application to a hammer handle.
  • FIG. 1 is a side view with partial section of a first embodiment of this device,
  • FIG. 2 is a side view with partial section showing the head ring when it is inserted into the hammer,
  • Figure 3 is a side view showing another embodiment of this device.

Dans ces dessins, 2 désigne de façon générale le manche d'un marteau 3. De façon connue, le manche 2 comporte, dans sa zone d'emmanchement dite "droite", une partie 5 avec des génératrices inclinées lui donnant une forme conique de faible conicité allant en s'évasant en direction du corps. Quant à l'oeil 6 de la masse 3 du marteau, il présente, comme le montre en coupe transversale la figure 2, une forme biconique divergent vers l'extérieur.In these drawings, 2 generally designates the handle of a hammer 3. In a known manner, the handle 2 comprises, in its fitting area called "straight", a part 5 with inclined generatrices giving it a conical shape of weak taper flaring towards the body. As for the eye 6 of the mass 3 of the hammer, it has, as shown in cross section in Figure 2, a biconical shape diverging outward.

Selon l'invention, avant son montage dans l'oeil 6, le manche 2 reçoit, sur sa partie conique 5, une bague de protection 7 en matériau synthétique souple et déformable élastiquement. Cette bague est emmanchée de force sur lui et de manière que sa face supérieure 7a soit sensiblement au niveau qu'occupera la face inférieure 3a de la masse du marteau.According to the invention, before it is mounted in the eye 6, the handle 2 receives, on its conical part 5, a protective ring 7 made of flexible and elastically deformable synthetic material. This ring is force fitted on it and so that its upper face 7a is substantially at the level that the lower face 3a of the mass of the hammer will occupy.

Lors de l'introduction de la partie 5 du manche dans l'oeil 6 du marteau, oeil brut de fabrication. Cette partie se rétreint localement pour assurer par serrage élastique la liaison manche-masse. Par le déplacement longitudinal de la partie 5 dans l'oeil, la face 3a vient en contact avec la face 7a de la bague 7, face 7a qui tend à déplacer cette bague vers la base du manche 2 en entrainant sa déformation radiale, améliorant le serrage élastique de celle-ci sur le manche. Après mise en place des coins de scellement et éventuellement d'une résine 8 dans la partie supérieure de l'oeil 6 du marteau, l'emmanchement est terminé.During the introduction of part 5 of the handle into the eye 6 of the hammer, raw manufacturing eye. This part shrinks locally to ensure by elastic tightening the neck-mass connection. By the longitudinal displacement of the part 5 in the eye, the face 3a comes into contact with the face 7a of the ring 7, face 7a which tends to move this ring towards the base of the handle 2 causing its radial deformation, improving the elastic clamping thereof on the handle. After placing the sealing corners and possibly a resin 8 in the upper part of the eye 6 of the hammer, the fitting is finished.

Si, à l'occasion de l'utilisation du marteau, l'opérateur positionne mal la masse 3 par rapport à l'outil devant être frappé et frappe sur cet outil avec le manche, le choc s'effectue dans la zone du manche comportant la bague 7. Celle-ci absorbe l'énergie de choc et la répartit sur une plus grande partie du manche, en évitant ainsi la détérioration des fibres de ce manche.If, during the use of the hammer, the operator positions the mass 3 incorrectly relative to the tool to be struck and strikes this tool with the handle, the impact takes place in the area of the handle comprising the ring 7. This absorbs the impact energy and distributes it over a larger part of the handle, thus avoiding the deterioration of the fibers of this handle.

Dans la forme d'exécution représentée à la figure 1, la bague a extérieurement une forme générale cylindrique à section elliptique ou oblongue. Dans la forme d'exécution représentée à la figure 3, elle a la même forme mais en plus est solidaire, dans sa partie venant contre la face inférieure 3a de la masse, d'un collet évasé 9 qui améliore la protection dans cette zone. De plus, par sa forme évasée constituant rampe, ce collet déplace l'outil en cas de frappe sur le manche, afin que la zone de choc soit décalée à l'opposé de la zone d'emmanchement, c'est à dire soit décalée par rapport à la face 3a de l'outil.In the embodiment shown in Figure 1, the ring externally has a generally cylindrical shape with elliptical or oblong section. In the embodiment shown in Figure 3, it has the same shape but in addition is integral, in its part coming against the underside 3a of the mass, a flared collar 9 which improves protection in this area. In addition, by its flared shape constituting a ramp, this collar displaces the tool in the event of a strike on the handle, so that the shock zone is offset opposite the fitting zone, that is to say is offset relative to the face 3a of the tool.

Comme le montre la figure 3, la bague de protection 7 est avantageusement utilisée en combinaison avec une bague de pied 10 qui est réalisée, comme elle, en matériau souple et élastique, et est emmanchée avec serrage élastique sur le pied du manche 2. Cette bague est solidaire d'une paroi transversale loa, lui donnant la forme d'une coiffe. La bague de pied protège le pied du manche et évite que ses fibres se délitent et forment des écailles, lorsque l'opérateur se sert de ce pied de manche pour frapper sur des pièces en cours d'ajustement.As shown in FIG. 3, the protective ring 7 is advantageously used in combination with a foot ring 10 which, like it, is made of flexible and elastic material, and is fitted with elastic clamping on the foot of the handle 2. This ring is integral with a transverse wall loa, giving it the shape of a cap. The foot ring protects the foot from the handle and prevents its fibers from disintegrating and forming scales, when the operator uses this foot of the handle to strike on parts being adjusted.

Bien entendu, le dispositif qui a été décrit dans le cas de son application à un manche de marteau peut être appliqué à tout autre manche d'outil de frappe.Of course, the device which has been described in the case of its application to a hammer handle can be applied to any other handle of a striking tool.

Claims (3)

1. Dispositif de protection pour manche d'outil de frappe comportant une extrémité dite droite, c'est à dire composée d'une partie conique de faible conicité apte à être emmanchée avec serrage dans l'oeil biconique de l'outil brut de forge, dispositif du type constitué par une bague en matériau élastique, caractérisé en ce que la bague est réalisée en matériau souple et déformable, et est montée avec serrage élastique sur la seule partie conique (5) de l'extrémité du manche, de manière, qu'après emmanchement sur l'outil et ajustement de la position longitudinale de cette bague, ajustement entraînant une déformation radiale de celle-ci et une augmentation de son serrage élastique sur le manche, sa face supérieure soit en contact avec la face inférieure (3a) de l'outil de frappe (3).1. Protective device for striking tool handle comprising a so-called straight end, that is to say composed of a conical part of low conicity capable of being fitted with tightening in the biconical eye of the raw forging tool , device of the type consisting of a ring of elastic material, characterized in that the ring is made of flexible and deformable material, and is mounted with elastic clamping on the only conical part (5) of the end of the handle, so that after fitting on the tool and adjusting the longitudinal position of this ring, adjustment resulting in a radial deformation of the latter and an increase in its elastic tightening on the handle, its upper face is in contact with the lower face (3a ) of the striking tool (3). 2. Dispositif selon la revendication 1, caractérisé en ce que la bague (7) comporte, dans sa partie venant contre la face inférieure (3a) de la masse, un collet évasé (7).2. Device according to claim 1, characterized in that the ring (7) comprises, in its part coming against the lower face (3a) of the mass, a flared collar (7). 3. Dispositif selon l'une quelconque des revendications 1 et 2, caractérisé en ce que la bague de tête (7) est associée à une bague de pied (10) qui, réalisée en matériau souple, est emmanchée avec serrage élastique sur le pied du manche (2), et est solidaire d'une paroi transversale 10a de protection lui donnant la forme d'une coiffe.3. Device according to any one of claims 1 and 2, characterized in that the head ring (7) is associated with a foot ring (10) which, made of flexible material, is fitted with elastic clamping on the foot of the handle (2), and is integral with a transverse protective wall 10a giving it the shape of a cap.
EP90420368A 1989-08-03 1990-08-03 Device for protection of a handle of a percussive tool and its method of placement Withdrawn EP0412030A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8910742 1989-08-03
FR8910742A FR2650524B1 (en) 1989-08-03 1989-08-03 PROTECTIVE DEVICE FOR HANDLE OF HITTING TOOLS AND MOUNTING METHOD THEREOF

Publications (1)

Publication Number Publication Date
EP0412030A1 true EP0412030A1 (en) 1991-02-06

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EP90420368A Withdrawn EP0412030A1 (en) 1989-08-03 1990-08-03 Device for protection of a handle of a percussive tool and its method of placement

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FR (1) FR2650524B1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2702175A1 (en) * 1993-03-05 1994-09-09 Loire Milourd Ets Moulin Blanc Striking tool handle protector and method of mounting
EP0703045A1 (en) * 1994-08-30 1996-03-27 Bremer, Hermann Standard tool shaft made of wood with hardened protection sleeve and additional safety fastening
WO1997012731A1 (en) * 1995-10-05 1997-04-10 Ruthe Werkzeugfabrik Gmbh Hammer
FR2744945A1 (en) * 1996-02-15 1997-08-22 Helko Werk Carl & Aug Helsper HAND TOOL WITH HITCHING EFFECT
WO1998048978A1 (en) * 1997-04-29 1998-11-05 Burnett John A Impact tool
US6477922B1 (en) * 1998-04-29 2002-11-12 John A. Burnett Impact tool
CN111775105A (en) * 2020-06-10 2020-10-16 胡嘉强 Hammer assembly quality

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960133A (en) * 1958-08-18 1960-11-15 Stanley Works Hammer butt plug
GB1039463A (en) * 1963-04-20 1966-08-17 Birmingham Belting Company Ltd Improvements in mallets, hammers and the like
DE1301779B (en) * 1966-12-23 1969-08-21 Berg & Co Hammer or the like with a wooden handle secured by a sleeve
US4172483A (en) * 1978-08-24 1979-10-30 Bereskin Alexander B Percussion head tool

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1752221A (en) * 1924-12-26 1930-03-25 Adolph E Anderson Guard
US2322178A (en) * 1940-12-18 1943-06-15 Tyler Ernest Pick handle protector
GB846702A (en) * 1956-07-12 1960-08-31 Wright Howard Clayton Ltd Improvements relating to hand tools
US2980154A (en) * 1959-01-12 1961-04-18 James W Williamson Sledge hammers
DE3719259A1 (en) * 1987-06-10 1988-12-22 Friedrich Wiegand Gmbh Handle protector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960133A (en) * 1958-08-18 1960-11-15 Stanley Works Hammer butt plug
GB1039463A (en) * 1963-04-20 1966-08-17 Birmingham Belting Company Ltd Improvements in mallets, hammers and the like
DE1301779B (en) * 1966-12-23 1969-08-21 Berg & Co Hammer or the like with a wooden handle secured by a sleeve
US4172483A (en) * 1978-08-24 1979-10-30 Bereskin Alexander B Percussion head tool

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2702175A1 (en) * 1993-03-05 1994-09-09 Loire Milourd Ets Moulin Blanc Striking tool handle protector and method of mounting
EP0615819A1 (en) * 1993-03-05 1994-09-21 FORGES DE LA LOIRE ET DE MILOURD ETABLISSEMENTS MOULIN BLANC Société Anonyme Percussion tool handle protector and its assembly method
EP0703045A1 (en) * 1994-08-30 1996-03-27 Bremer, Hermann Standard tool shaft made of wood with hardened protection sleeve and additional safety fastening
WO1997012731A1 (en) * 1995-10-05 1997-04-10 Ruthe Werkzeugfabrik Gmbh Hammer
FR2744945A1 (en) * 1996-02-15 1997-08-22 Helko Werk Carl & Aug Helsper HAND TOOL WITH HITCHING EFFECT
WO1998048978A1 (en) * 1997-04-29 1998-11-05 Burnett John A Impact tool
US6477922B1 (en) * 1998-04-29 2002-11-12 John A. Burnett Impact tool
CN111775105A (en) * 2020-06-10 2020-10-16 胡嘉强 Hammer assembly quality
CN111775105B (en) * 2020-06-10 2022-08-23 永康市德润有色金属有限公司 Hammer assembly quality

Also Published As

Publication number Publication date
FR2650524A1 (en) 1991-02-08
FR2650524B1 (en) 1994-08-26

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