Striking device for ankle striking

Abstract

The invention relates to a striking device (1) for a hammer-in peg (6) comprising: - a handle (2) for gripping the striking device (1), having a head (21) for being struck by a hammer and a striking end (22) for impacting the peg; and - a cap (4) for guiding the peg during its impact; characterized in that the cap (4) is mounted by a sliding connection around the striking end (22), and is movable between: - an extended position where the cap (4) protrudes from the striking end (22), and receives the hammer-in peg (6), and - a flush position where the cap (4) is substantially flush with the striking end (22), when the hammer-in peg (6) is inserted into its receiving hole. Figure for the abstract: Fig. 1

Description

Title of the invention: Striking device for striking ankle Technical field

[0001] The invention relates to the technical field of hand tools, in particular for construction or building. Prior art

[0002] In order to speed up the installation times for fixing elements to a frame, it is known from the prior art to use hammer-in anchors. These anchors have the advantage of allowing the simultaneous installation of the anchor and the screw, because these two elements are pre-assembled, and it is sufficient to hammer in the pre-assembled anchor, like a nail, to fix an element to a frame.

[0003] Such dowels are used, for example, for installing U-shaped rails, intended to fix plasterboards to form partitions.

[0004] When laying these rails, it is necessary to drill the rail and the ground, then position the anchor to be driven at the entrance of the hole provided for this purpose. The anchor must then be driven to penetrate completely into the hole and secure the rail. When driving the anchor, it is best to hold it to ensure its alignment with the hole receiving it: if the anchor is misaligned, it may break when driven.

[0005] In addition, this operation is penalized, due to the presence of the rail which hinders the accessibility of the ankle. It is therefore common for the ankles to be badly oriented when striking, which leads to their deterioration, or at the very least which complicates the operation.

[0006] In order to facilitate the striking of the dowel, it is known to use a screwdriver or a pin punch comprising a head struck by a hammer, and a striking end intended to impact the dowel. Using a screwdriver or a pin punch allows the hammer to be manipulated above the rail, and therefore facilitates striking. However, it is still common to strike askew and damage the dowel or the surrounding elements: - if the screw is hit with a screwdriver, it is common to damage the screw's imprint, so that it is then impossible to unscrew it. - in the case of the installation of a rail or a profile that remains visible, such as a roof edge strip, the rail or profile fulfills a decorative function: in the event of a crooked strike or if the hammer slips on the screw, and the element being fixed is damaged, then it must be replaced: this results in a loss of time and material.

[0007] Document US 6553640 is known which describes a device for assisting in the placement of a striking dowel, and which further comprises a guide making it possible to avoid striking However, this device is heavy, complex, and bulky, so its cost and use are prohibitive.

[0008] There are therefore improvements to be proposed to such devices. Statement of the invention

[0009] The invention aims to solve the problems of the prior art, by proposing a striking device for a striking dowel which is of simple design, light, and practical to use, with a reduced cost price.

[0010] For this purpose, a striking device for a striking ankle has been developed comprising: - a handle intended for gripping the striking device, having a head intended to be struck by a hammer and a striking end intended to impact the ankle; and - a cap designed to guide the ankle when striking.

[0011] According to the invention, the cap is mounted in sliding connection around the striking end, and is movable between: - a deployed position where the cap protrudes from the striking end, and receives the ankle, and - a flush position where the cap is substantially flush with the striking end, when the dowel is inserted into its receiving hole.

[0012] Thus, the striking device is handled in the same way as pin punches of the prior art. The cap is mounted in a sliding connection directly around the striking end, which allows for a simple and compact device. The device thus designed is light, practical to use and has a reduced cost.

[0013] Preferably, the sliding connection comprises a compression spring tending to push the cap back into the deployed position. In this way, the striking device is equally well suited to installing dowels at ground level as on walls, since the cap is not returned to the deployed position solely by gravity.

[0014] Advantageously, the spring has a first end fixed to the handle, and a second end fixed to the cap. In this way the spring makes it possible to secure the cap and the handle, without requiring additional parts. The design of the striking device remains simple and inexpensive.

[0015] In one embodiment, the cap has an internal diameter less than or equal to 10 mm. This embodiment is particularly suitable for small diameter hammer-in pegs, for example less than or equal to 8 mm, which are particularly prone to damage when hammered at an angle.

[0016] In order to present a good compromise between the restoring force of the cap in the deployed position, and the effort necessary to bring the cap into the flush position when inserting a hammer pin, the spring has a stiffness between 9 and 16 N / cm, preferably between 11 and 14 N / cm.

[0017] In order to be adapted to the most common dimensions of small diameter hammer-in anchors, a stroke between the deployed position and the flush position is between 15 and 50mm, preferably between 25mm and 40mm.

[0018] Advantageously, the cap is a cylinder, and preferably of a length between 25mm and 80mm, and even more preferably between 40mm and 60mm. In this way the cap is of extremely simple and light design.

[0019] According to a particular embodiment, the cap has on its external surface a spring fixing arrangement. Thus, the fixing of the spring is facilitated, without requiring additional manufacturing steps such as welding or gluing. This same embodiment can be applied to the handle.

[0020] A simple way of achieving such an arrangement consists of a groove which allows the first coil(s) of the spring to be received.

[0021] In a preferred embodiment, the striking device consists only of the handle, the cap and the spring. Thus, the design of the striking device is simplified as much as possible. Brief description of the drawings

[0022] [Fig-1] is a sectional diagram of a striking device according to the invention, and positioned to insert a striking peg into a hole.

[0023] [Fig.2] is a figure similar to [Fig.l], on which the striking pin is inserted. Detailed description of the invention

[0024] With reference to Figures 1 and 2, the invention consists mainly in proposing a striking device (1) of which a cap (4) guides the striking pin (6) during its insertion.

[0025] In the preferred embodiment illustrated, the striking device (1) comprises: - a handle (2) intended for gripping the striking device (1), having a head (21) intended to be struck by a hammer, and a striking end (22) intended to impact the peg to be struck (6); and - a cap (4) intended to guide the striking pin (6) during its striking. The cap (4) is mounted in sliding connection around the striking end (22), so that it is movable between: * a deployed position where the cap (4) protrudes from the striking end (22), and receives the striking pin (6), as illustrated [Fig.l], and * a flush position where the cap (4) is substantially flush with the striking end (22), when the striking pin (6) is fully inserted in its receiving orifice or hole (71), as illustrated [Fig.2].

[0026] Arranging the cap (4) directly on the striking end (22) makes it possible to obtain a guide of simple, light and inexpensive design.

[0027] By "sliding connection" is meant that the cap (4) is mounted on the striking end (22) with a sliding capacity in the direction of the general axis of the striking device (1), but it can also be a sliding pivot connection in the strictly kinematic sense of the term. The term "sliding connection" is not limiting.

[0028] When fixing a rail (5) to the ground (7): - we place it on the ground (7), then - the assembly is counter-drilled in order to prepare a hole (71) intended to receive the hammer-in anchor (6), - then, the hammer-in pin (6) is placed at the entrance in the hole (71) made, through the rail (5), as illustrated in [Fig.l].

[0029] In this figure, it can be seen that the hammer-in anchor (6) comprises a screw (6a) and a dowel (6b) itself. During installation, the screw (6a) protrudes from the dowel (6b).

[0030] Once the hammer-in dowel (6) is presented in the hole (71), the assembly must be hammered so that it completely penetrates the hole (71), and the screw (6a) completely penetrates the dowel (6b) in order to cause the expansion thereof, thus ensuring the fixing of the rail (5).

[0031] The accessibility of the screw (6a) being hindered by the rail (5), the striking device (1) has a cap (4) which allows the dowel to be struck (6) to be guided: - The cap (4) is placed around the striking pin (6). A bearing surface (41) of the cap (4) is in contact with the internal face of the rail (5), which ensures the verticality of the striking device (1). - When striking with a hammer on the head (21) of the handle (2), the sliding connection made between the cap (4) and the handle (2) ensures that the impact made by the striking end (22) on the striking pin (6) will not be misaligned.

[0032] The force applied to the hammer-in anchor (6) being axial and correctly aligned, the risks of deterioration of the hammer-in anchor (6), even when it is of small diameter, are eliminated.

[0033] Furthermore, the length of the striking device (1) is of the order of 10 to 20 cm, which makes it possible to place the head (21) above the rail (5), approximately twenty centimeters from the ground level (7), which makes it possible to strike the striking pins (6) in an ergonomic position.

[0034] A simple way of achieving translational guidance of the cap (4) is to design a cylindrical cap (4), and to place it directly on the striking end (22) which is also cylindrical. From a strictly kinematic point of view it This is a sliding pivot connection, but the sliding capacity of the cap (4) defines the desired slide connection.

[0035] The cap (4) can therefore be obtained from a tube with a diameter less than or equal to 10 mm, and a thickness between 0.5 mm and 2 mm, for example 1 mm. Such tubes are commercially available, so that the manufacture of the cap (4) is inexpensive.

[0036] When placing the striking anchor (6) on the ground (7), the striking device (1) is held in a vertical position, so that gravity tends to bring the cap (4) back into the deployed position. So that the striking device (1) is suitable for placements both on the ground and on walls and ceilings, it comprises a compression spring (3) which tends to push the cap (4) back into its deployed position.

[0037] In order for the cap (4) to be returned to the deployed position efficiently, but for the passage of the cap (4) from the deployed position to the flush position not to require too great an effort, the effort exerted by the spring (3) on the cap (4) when it is in the flush position is between 30N and 50N, for example 40N.

[0038] When the cap (4) has a travel between the deployed position and the flush position which is between 15 and 50 millimeters, and preferably between 25 and 40 millimeters, then the stiffness of the spring (3) can be chosen between 9 N / cm and 16 N / cm, and preferably between 11 N / cm and 14 N / cm.

[0039] These stroke values ​​correspond to the main commercially available striking pins (6).

[0040] In order to be compatible with these races, the cap (4) has a length of between 25 and 80 millimeters, and preferably between 40 and 60 millimeters.

[0041] In order to keep the design of the striking device (1) simple, the disassembly of the cap (4) is not prevented by an additional part, but directly by the spring (3) which has a first end (31) fixed to the handle (2) and a second end (32) fixed to the cap (4). This fixing can be obtained by any suitable means, such as gluing, welding, but preferably this fixing is obtained by clamping and / or snap-fastening.

[0042] In a first embodiment, the spring (3) has an inner diameter smaller than the outer diameters of the part (42) of the cap (4) and of the part (23) of the handle (2) receiving the spring (3). The part (42) of the cap (4) or the part (23) of the handle (2) receiving the spring (3) may be of non-cylindrical geometry, for example hexagonal. The mounting of the spring (3) is facilitated because it is possible to grip a first turn of the spring (3) with a tool, between two edges of the hexagonal geometry, in order to position the spring (3) on the part (42) of the cap (4) or the part (23) of the handle (2).

[0043] In a second embodiment, an external surface of the portion (42) of the cap (4) and / or an external surface of the portion (23) of the handle (2) have an arrangement, such as knurling or grooving, which makes it possible to increase the friction forces between the external surface of the cap (4) / of the handle (2) against the spring (3). This increased friction force makes it possible to guarantee the solidity of the attachment.

[0044] In a third embodiment, the spring (3) is snapped onto the handle (2) and / or onto the cap (4). In this embodiment, an arrangement such as a groove is provided in order to receive a first turn of the spring (3) which the first end (31) and the second end (32) have. A groove is easy and inexpensive to obtain by turning, whether on the part (23) of the handle (2) or on the part (42) of the cap (4).

[0045] It is possible to combine the tightening and snap-fastening of the spring (3) on the handle (2) and / or the cap (4), for example if the part (42) of the cap (4) has a diameter greater than the internal diameter of the spring (3), and has several grooves.

[0046] In the preferred embodiment, the striking device (1) comprises only three parts, namely the handle (2), the spring (3), and the cap (4). The striking device (1) obtained makes it possible to overcome the drawbacks of the prior art while remaining simple, inexpensive, light and effective.

[0047] Furthermore, the striking device (1) may be shaped differently from the examples given without departing from the scope of the invention, which is defined by the claims.

[0048] The handle (2) may include an overmolding intended to facilitate its grip or to protect the hand holding it from a possible hammer blow. The overmolding is not considered an additional part.

[0049] Furthermore, the technical characteristics of the various embodiments and variants mentioned above can be, in whole or in part, combined with each other. Thus, the striking device (1) can be adapted in terms of costs, functionalities and performance.

Claims

Claims

1. Striking device (1) for a striking dowel (6) comprising: - a handle (2) intended for gripping the striking device (1), having a head (21) intended to be struck by a hammer and a striking end (22) intended to impact the dowel; and - a cap (4) intended to guide the dowel during its striking; characterized in that the cap (4) is mounted in sliding connection around the striking end (22), and is movable between: - a deployed position where the cap (4) protrudes from the striking end (22), and receives the striking dowel (6), and - a flush position where the cap (4) is substantially flush with the striking end (22), when the striking dowel (6) is inserted into its receiving orifice.

2. Striking device (1) according to claim 1, characterized in that the sliding connection comprises a compression spring (3) tending to push the cap (4) into the deployed position.

3. Striking device (1) according to claim 2, characterized in that the spring (3) has a first end (31) fixed to the handle (2), and a second end (32) fixed to the cap (4).

4. Striking device (1) according to one of the preceding claims, characterized in that the cap (4) has an internal diameter less than or equal to 10 mm.

5. Striking device (1) according to one of claims 2 or 3, characterized in that the spring (3) has a stiffness of between 9 and 16 N / cm, preferably between 11 and 14 N / cm.

6. Striking device (1) according to one of the preceding claims, characterized in that a stroke between the deployed position and the flush position is between 15 and 50mm, preferably between 25mm and 40mm.

7. Striking device (1) according to one of the preceding claims, characterized in that the cap (4) is a cylinder, preferably of length between 25mm and 80mm, and more preferably between 40mm and 60mm.

8. Striking device (1) according to one of claims 2 to 7, characterized in that the cap (4) has on its external surface an arrangement for fixing the spring (3), preferably a groove.

9. Striking device (1) according to one of claims 2 to 8, characterized in that the handle (2) has on its external surface an arrangement for fixing the spring (3), preferably a groove.

10. Striking device (1) according to one of claims 2 to 9, characterized in that it consists of the handle (2), the cap (4) and the spring (3).

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