FR2814976A1 - Impact tool with interchangeable tips has cylindrical inner cavity with threaded surface to receive threaded end and collar on tip - Google Patents

Abstract

The impact tool consists of a body (1) with a hand grip (2) and an end (1a) designed to be struck with a hammer. The opposite end (1b) has a cylindrical cavity (1c) with a threaded surface (1d) to receive an interchangeable impact tip (3). The tip, which can be made from a metal or synthetic material, has a threaded end (3e), an annular recess (3d) and a collar (3c). Variants of the design can have the tips fixed in place by a spring and ball catch or a ring seal.

Description

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L'invention se rattache au secteur technique des outils et instruments de frappe. INTERCHANGEABLE TIP STRIKING TOOL

The invention relates to the technical sector of striking tools and instruments.

To the knowledge of the applicant, the known hand typing tools are designed to be used in a single application. They therefore generally consist of a one-piece body with a striking head at one end, and a contact and contact area at the other end to come onto the piece to be struck intended to be pressed into a wall or other support. , or on a tool, for example in the application of pin drives, or other similar intervention. A grip and protection handle is positioned on the body of the tool.

According to this implementation, the hand striking tool is used for limited specific purposes. It is therefore necessary to have a range of striking tools according to the uses on parts, parts, tools or the like to be struck which can be produced in different materials.

We also know, for a number of hand tools, the concept of a handle body receiving interchangeable tips, these tips being useful with specific shapes according to their applications. This is the case, for example, with screwdrivers, open-end wrenches, ratchet wrenches, hexagon wrenches and the like.

The application of this concept for a striking tool cannot be envisaged, since the exercise of striking on the tool can eventually lead, on the useful part, to deformations or harmful deterioration. More particularly if the endpiece is screwed to the end of the body of the impactor, the thread may be damaged, and it

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 y then unable to change the tip. This is the reason why, to the knowledge of the applicant, the hand hammer tools have so far been all designed and used for a single function and use.

Faced with the problem posed, the applicant sought a solution allowing the use of a hand-held striking tool receiving interchangeable tips, but without there being any risk of deterioration in the connection between them, during successive striking efforts during the use of the tool, and in particular deterioration of the thread.

The applicant's approach was therefore to seek a solution to this problem posed, a solution which is simple to carry out and without excessive cost, to take account of the value of the striking tools on the market.

In other words, the solution provided should not be able to substantially outbid the cost of manufacturing the striking tool compared to the possibility of obtaining a range of striking tools, according to known market conditions.

The solution found thus meets these research objectives, and makes it possible to offer the consumer, from a standardized body, a range of modules suitable for typing on all supports made of various materials.

According to a first characteristic of the invention, the striking tool, of the type comprising a body mounted with a rear end forming a striking head and capable of receiving a grip and protection handle, is remarkable in that said body is arranged in its front end part with a cylindrical inner surface extending by a blind interior cavity, said body

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 receiving a removable profiled end-piece, the front part of which constitutes the useful striking area on the support product to be struck, while the rear part of said end-piece is arranged with an externally projecting collar, constituting by its rear face a zone of abutment against the face d end of said body, said end piece extending at the rear of said flange by a first cylindrical seat capable of being in correspondence after mounting with the cylindrical seat formed on said body, said first cylindrical seat extending by a groove, then by a second cylindrical seat engaging in the internal cavity of the body, and in that said internal cavity of the body and said second cylindrical seat of the endpiece are arranged with complementary connecting means to ensure retention and control of the withdrawal of the tip relative to said body, and in that the striking forces exerted on the body of the tool on its striking zone are absorbed and supported by the assembly of the cylindrical bearing surface of the body and the first bearing surface of the endpiece, without effect on the complementary means of connecting the endpiece and the body.

These characteristics and others will become apparent from the following description.

To fix the object of the invention illustrated in a nonlimiting manner in the figures of the drawings where: - Figure 1 is a perspective view of a striking tool receiving a tip according to the invention, shown before mounting in a first variant.

- Figure 2 is a perspective view after mounting the nozzle in the body, according to Figure 1.

- Figure 3 is a partial sectional view before mounting the nozzle in the body, according to Figure 2, in a first implementation.

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 - Figure 4 is a longitudinal sectional view of the striking tool after mounting the tip in the body, according to Figure 2, in a first implementation.

- Figure 5 is a partial sectional view before mounting the nozzle in the body, in a second implementation.

- Figure 6 is a longitudinal sectional view of the striking tool after mounting the tip in the body, according to Figure 5, in a second implementation.

- Figure 7 is a partial sectional view before mounting the nozzle in the body, in a third implementation.

- Figure 8 is a longitudinal sectional view of the striking tool after mounting the nozzle in the body, according to Figure 7, in a third implementation.

In order to make the object of the invention more concrete, it is now described in a nonlimiting manner illustrated in the figures of the drawings.

The striking tool is referenced as a whole by (0) and comprises a cylindrical body (1) of great length, having at its front end a striking head (la), capable of receiving a grip and protection handle ( 2). The characteristics of this handle, with or without guard, are arbitrary.

A nonlimiting example has been shown in the drawings for understanding the invention.

A preferred and advantageous embodiment of the invention is described below.

The other end (lb) of the body thus has and according to the invention, an inner cylindrical bearing (lc) extending in a first implementation by

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 a blind cavity in the form of a long thread (Id). This body is capable of receiving a tip (3) which can be made of all metallic materials, aluminum, brass, bronze, or synthetic materials, such as that known in the trade under the brand Nylon t, or other materials. Said tip is made in one piece from one of the aforementioned materials. This end piece (3) has, in its front part, a useful zone (3a) constituting the bearing zone of the part to be struck, the part being arbitrary. The tip has, in its middle part, advantageously, a collar (3b) which can advantageously be knurled or striated to facilitate handling by the operator. This cylindrical zone forming a collar, or as a variant (not shown in the drawings), forming a continuous tubular element, is extended behind by a first cylindrical seat (3c) of smaller section than the collar or the barrel of the end piece. This bearing is intended to be integrated into the inner bearing formed on the body of the tool. It therefore has a length adapted to that of the inner surface of the tool, to ensure a firm connection and guidance.

Adjacent to the bearing surface formed on the end-piece, a groove (3d) is provided, followed by a second threaded cylindrical bearing surface (3e) capable of cooperating with the above-mentioned internal thread (Id) formed in the body.

During assembly, the end piece is stopped by the body before the second threaded seat (3e) is at the end of tapping, so the forces during striking are not undergone by the threads (3e), but by the first cylindrical shoulder (3c) of the end piece coming into mechanical abutment against the front part of the handle.

Thus, according to the invention, the positioning of the nozzle in the body is effected by screwing the nozzle at the end of said body. The cylindrical bearings (Ic-

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 3c) are in correspondence with each other, so that when there are striking forces exerted on the tool, the damping of said forces is effected by the aforementioned bearing surfaces (lc-3c), without qu 'there is a specific effect on the threaded area.

There is shown in Figures 5 and 6 a second alternative embodiment in the tip connection (3) tool body (1) beyond the area defined by the bearing surfaces (lc- 3c) receiving impact forces.

According to this second variant, the second cylindrical bearing surface (3e) of the endpiece (3) has a smooth outer part with, in a plane perpendicular to its longitudinal axis, a housing (3f) receiving a ball (3g) in support on a return spring (3h). The ball (3g) is crimped on the smooth surface with a slight external overflow. The inner cavity (the) of the body which is blind is smooth. When the tip is pressed into the body of the impact tool, the ball (3g) retracts into its housing against the return spring. Said ball under the pressure of the return spring exerts a force on the wall of the cavity (the) opposite tending to ensure locking of the nozzle in the body by a braking and retaining effect.

According to the third variant shown in Figures 7 and 8, the second cylindrical bearing surface of the nozzle remains smooth, while the internal cavity (the) of the body is fitted with a grooving (If) allowing the insertion of a rod (lag ) with elastic deformation capacity, by its constituent material for example. This ring comes to bear on the second cylindrical bearing surface of the endpiece and also exerts a binding and retaining effect allowing a locking to be obtained.

Thus, in the three variants exposed, the internal cavity of the body and the second cylindrical bearing surface of the endpiece are arranged with complementary means

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 of connection to ensure the retention and the control of the withdrawal of the endpiece relative to the body. The tip can advantageously be made of any suitable material, metallic, brass or bronze type, or be made of aluminum or synthetic material such as Nylon e, or any other material suitable for each use. The different tips in all materials have strictly the same characteristics and can therefore be applied without any interchangeability difficulty in the body.

It is therefore quite possible to have a packaging box receiving a plurality of tips and a single body. The various end pieces systematically have an identical part corresponding to the attachment area of the end piece in the body, under the conditions which have been mentioned previously. On the other hand, the useful part can have various configurations depending on the fields of application and use of the tips.

The invention finds many advantages.

First of all, the quality of the striking tool and its set of bits is emphasized, without there being any possible deterioration of the latter, the possibility of an immediate change of tip without particular difficulty.

We also highlight the possibility of having a multitude of tips of different materials in the same case. Consequently, the storage volume of the striking tools is reduced.

Claims (6)

 - 1-Striking tool with interchangeable tips, of the type comprising a body mounted with a rear end forming a striking head and capable of receiving a grip and protection handle, characterized in that said body (1) is arranged in its part d 'front end with a cylindrical inner surface (lc) extending by a blind inner cavity (le), said body receiving a removable end piece (3) whose front part (3a) constitutes the useful striking area on the support product to strike, while the rear part of said end piece is arranged with a flange (3b) projecting outwardly, constituting by its rear face an abutment zone against the end face of said body, said end piece extending at the rear of said flange by a first cylindrical bearing surface (3c) capable of being in correspondence after mounting with the cylindrical bearing surface formed on said body, said first cylindrical bearing surface s e extending by a groove (3d), then by a second cylindrical bearing (3e) engaging in the internal cavity of the body, and in that said internal cavity of the body and said second cylindrical bearing of the endpiece are arranged with additional connecting means to ensure the retention and the control of the withdrawal of the endpiece with respect to said body, and in that the striking forces exerted on the body of the tool on its striking zone are absorbed and supported by assembling the cylindrical bearing surface of the body and the first bearing surface of the end piece, without effect on the complementary means of connecting the end piece and the body.

 - 2-Tool according to claim 1, characterized in that said body (1) is arranged in its front end part with a cylindrical inner surface (the) extending by a thread (Id), and in that said end piece is extended at the rear of said collar, extending by a groove (3d), then by a threaded part (3e) integrating into the thread of said body. <Desc / Clms Page number 9>  - 3-Tool according to claim 1, characterized in that the second cylindrical surface (3e) of the nozzle (3) has a smooth outer part with in a plane perpendicular to its longitudinal axis a housing (3f) receiving a ball (3g) resting on a return spring (3h), said ball (3g) being crimped on the smooth surface with a slight external overflow, and in that the internal cavity (the) of the body is smooth.

 - 4-Tool according to claim 1, characterized in that the second cylindrical bearing surface of the end piece is smooth, while the body cavity (it) is provided with a grooving (If) allowing the insertion of a rod ( lag) with elastic deformation capacity, said rod exerting a binding and retaining effect of the end piece in the body.  - 5-Tool according to claim 1, characterized in that the cylindrical zone forming the flange (3b) constitutes a continuous tubular element up to the useful zone (3a) of the nozzle.  - 6-Tool according to any one of claims 1 to 5, characterized in that it receives a plurality of tips of all metallic materials, aluminum, brass, bronze, or synthetic materials, such as that known in the trade under the brand Nylon (ffl, or other materials.