GB2190322A - Anti-rebound hammer head - Google Patents

Abstract

An anti-rebound hammer head (1) comprises two body parts (6) each partly hollow and of metallic material and each having at one end an impact face (8) and at the opposite end a sealing face. The sealing faces are welded together so that the hollows communicate to form a single hollow 2, preferably extending more than two thirds of the distance between the impact faces, and containing anti-rebound filling material (3). A neck portion (7) of the parts adjacent the sealing surfaces define an annular recess into which is moulded an annular part (5) of a handle (4). A threaded plug (11) extends into the recess and thus into the handle to stiffen the connection and prevent relative rotation. The construction of the hammer-head is simple and by increasing the size of the hollow (2), compared with known systems, sufficient filling material (3) can be incorporated to allow the impact faces of the hammer to be made of metallic material. The sealing faces may be shaped or bevelled to determine interconnection in one relative angular position only. <IMAGE>

Description

SPECIFICATION Anti-rebound hammer head This invention relates to an anti-rebound hammer head and a hammer incorporating such head.

Present known anti-rebound hammers consist of a central body partly hollow and filled with lead shot or similar material, with impact faces attached to the exterior of the body, each by screwing on to an associated end stud projecting from a disk provided on a side of the central body.

This system is suitable for the construction of hammers only with impact faces of synthetic material or any other similarly light weight material, since the volume of hollow space in the central body which can be filled with lead shot is insufficient to counteract the considerable mass of metallic or similar impact faces and prevent the rebound effect.

The synthetic impact faces are designed for indefinite purposes for which they do not require any special configuration, curved shapes being usually adopted which are perfectly compatible with the disks on to which they are to be threaded. Where metallic impact faces are concerned, however, the very large number of applications for which they are intended necessitate definite shapes, such as a square cross section, for example, which are incompatible from the aesthetic point of view with the securing method based on threaded studs, as the end of the threading will never correspond to the desired arrangement and the impact surfaces will not always assume the same position on different hammers.

In view of the foregoing there are so far no antirebound hammers available with metallic impact faces.

In a known type of hammer the handle has an annular portion gripping a neck of the hammer head, a handle of this type being disclosed in Spanish Utility model No: 244929 of the present Applicant.

The present invention provides an anti-rebound hammer head comprising a body formed in two parts each partly hollow and of metallic material and each having at one end an impact face and at the opposite end a sealing face defining an opening to the hollow, the sealing faces of the parts being secured together so that the hollows communicate to form a single hollow containing anti-rebound filling material, a neck portion of the parts adjacent the periphery of the sealed surfaces defining an annular recess.

For given overall external dimensions this construction allows a much larger hollow space than the known system with impact faces screwed on to a body and this allows the use of metallic impact faces since a greater inert mass of filling material can be provided. In addition the impact faces can be given any desired, and non regular configeration, since with the claimed method of construction the parts of the head can always be positioned together in the most suitable manner before being secured together.

In addition the hammer head is constructed very simply requiring fewer and more easily manufactured parts with the elimination of the known disks which required a high quality finish.

Preferably, a radially extending channel extends through the neck portion into the hollow and is closed by a plug which extends outwardly into the recess. A handle having an annular portion located in the recess is preferably moulded around the neck and the plug so that plug stiffens the connection between the head and handle and prevents relative rotation.

An embodiment of hammer head will now be described, by way of example only, with reference to the accompanying drawings of which: Figure 1 is an elevation showing a longitudinal section through the hammer head and a portion of a handle, Figure 2 shows an enlarged view of the welding bead of Figure 1, and Figure 3 shows an enlarged view of a threaded stud of Figure 1.

A hammer head 1 made of metallic material is formed from two parts 6 each having at one end an impact face 8 and at the opposite end a sealing surface which is engaged with and welded to the sealing face of the other part 6. Each part 6 is hollowed out with the hollow opening to the sealing face so that the two hollowed parts form a single internal hollow 2 of the hammer head. This hollow 2 is partly filled with lead shot 3 or like filling material. Each part 6 is formed with a relatively wide part associated with the impact face 8 and a relatively narrow cylindrical neck portion 7 adjacent the periphery of the sealing face, the neck thus defining an annular recess. A handle 5 is moulded to the hammer head so that it has an annular portion 4 filling the recess.

When the two halves 6 have been welded together, for example by welding bead 9, a radial transverse orifice 10 is formed through the wall of the neck portion and extending into the hollow 2 to allow introduction of the filling material 3. This orifice 10 is then blocked by a plug in the form of a threaded stud 11 which extends for the greater part of its length beyond the orifice into the recess and is thus incorporated into the handle when this is moulded to the neck. The stud 11 thus acts as a stiffening and reinforcement to the connection between the head and the handle and prevents relative rotation.

The hollow 2 extends beyond the neck portions 7 into the parts defining the impact faces. This hollow extends more than half and preferably more than two thirds of the dis tance between the impact faces thus increasing the volume of the hollow, in comparison with known hammer heads, and allowing sufficient filling material to be incorporated to absorb the impact of metallic or similar heavy impact faces.

The parts are shaped to have a smooth final outline with flush connecting surfaces.

The sealing faces may be shaped or bevelled so that they will connect together in only one relative angular position.

Claims (11)

1. An anti-rebound hammer head comprising a body formed in two parts each partly hollow and of metallic material and each having at one end an impact face and at the opposite end a sealing face defining an opening to the hollow, the sealing faces of the parts being secured together so that the hollows communicate to form a single hollow containing antirebound filling material, a neck portion of the parts adjacent the periphery of the sealed surfaces defining an annular recess.

2. A hammer head according to Claim 1 including a handle having an annular portion located in the recess.

3. A hammer head according to Claim 1 or Claim 2 in which a radially extending channel extends through the neck portion of the wall into the hollow and is closed by a plug extending outwardly into the recess.

4. A hammer head according to Claim 2 together with Claim 3 in which the plug stiffens the connection between the head and the handle.

5. A hammer head according to Claim 3 or Claim 4 in which the plug is a threaded stud.

6. A hammer head according to any of Claims 1 to 5 in which the hollow extends beyond the neck portion into the portions defining the impact faces.

7. A hammer head according to any of Claims 1 to 6 in which the sealing faces are secured together by welding.

8. A hammer head according to any of Claims 1 to 7 in which the sealing faces are shaped or bevelled to connect together in only one relative angular position,

9. A hammer head according to any of Claims 1 to 8 in which the hollow extends for more than two thirds of the distance between the impact faces.

10. A hammer head substantially as described herein with reference to or as illustrated in the accompanying drawing.

11. A hammer including a hammer head according to any of Claims 1 to 10.