Coil feed device for portable power tools

Description

Priority Claim

[0001] This application claims priority to French Application No. 2109411, filed September 8, 2021.Technical Field

[0002] The present disclosure relates to a battery-powered portable electric device. More specifically, the present disclosure relates to a portable electric device of the nail fastener driving tool type that makes it possible to drive nails into a support.Background

[0003] Well-known portable electric tools use an electric motor driving a flywheel or a geared motor compressing a spring in order to store mechanical energy that makes it possible to set movable parts of the portable electric device in movement, such as for example a piston fitted with a firing pin in the case of a nail fastener driving tool. Prior patent document EP3838490A1, which discloses the preamble of claim 1, describes a working tool, such as a setting tool for driving fastening elements into a substrate.

[0004] The drawbacks of this type of solution are numerous, in particular a reduced service life (in particular wear of the coils), weak output and high weight. However, there is also a rather short service life and / or battery charge in the event of intensive use.

[0005] It would therefore be advantageous to provide the operator with a portable electric tool which alleviates the problems cited.Summary

[0006] The invention is defined in the appended claims. The present disclosure relates to a power supply device for coils for a portable electric tool 20, said portable electric tool comprising a casing 40 forming a cylinder 10 in which a movable piston 1 slides between a start position at the start of travel of the piston and an end position at the end of travel of the piston. The present disclosure also provides a coil feeding device for electroportable tools.

[0007] More specifically, the power supply device comprises: (1) at least one battery intended to supply current and voltage to the coils; (2) a first, fixed coil 4 located in the cylinder 10 at the start of travel of the movable piston 1; (3) a second, movable coil 5 located facing the first, fixed coil 4 and secured to the movable piston 1; and (4) power supply routing means (61, 62) for the second, movable coil 5, these means being secured to the piston and intended to channel the power supply from the battery so as to supply power to the first, fixed coil 4 and the second, movable coil 5. Each power supply routing means being configured to cooperate with connectors (71, 72), each of which is connected to one and the same terminal of the battery over at least a displacement

[0008] distance X of the piston between the start position and the end position of the piston, said distance X being less than or equal to a distance D corresponding to the maximum distance travelled by the piston between the start position and the end position.

[0009] Moreover, the power supply routing means (61, 62) are in electrical contact with said connectors (71, 72) over a distance X equal to the length of said power supply routing means (61, 62).

[0010] According to the invention, the second, movable coil 5 is supplied with power over a distance X equal to said distance D by means of a scraper contact 75 between an internal face (401, 402) of the casing 40 and the movable coil 5.

[0011] In addition, the power supply routing means (61, 62) are located on either side of the longitudinal axis 30.

[0012] According to one feature, the power supply routing means (61, 62) are located along the longitudinal axis 30.

[0013] According to another feature, the coils (4, 5) are, for example but not exclusively, concentric about the longitudinal axis 30 of the movable piston 1.

[0014] Advantageously, the power supply routing means (61, 62) are intended to channel the power supply from the battery so as to supply power in series to the first, fixed coil 4 and the second, movable coil 5.Brief Description Of The Several Views Of The Drawings

[0015] Embodiments of the present disclosure will now be described solely by way of example with reference to the drawings of the following figures. Figure 1 illustrates the invention according to a first embodiment. Figure 2 illustrates in greater detail the scraper contact enabling the supply of power to the coils along the cylinder. Detailed Description

[0016] While the systems, devices, and methods described herein may be embodied in various forms, the drawings show and the specification describes certain exemplary and non-limiting embodiments. Not all of the components shown in the drawings and described in the specification may be required, and certain implementations may include additional, different, or fewer components. Variations in the arrangement and type of the components; the shapes, sizes, and materials of the components; and the manners of connection of the components may be made without departing from the scope of the claims. Unless otherwise indicated, any directions referred to in the specification reflect the orientations of the components shown in the corresponding drawings and do not limit the scope of the present disclosure. Further, terms that refer to mounting methods, such as coupled, mounted, connected, etc., are not intended to be limited to direct mounting methods, but should be interpreted broadly to include indirect and operably coupled, mounted, connected, and like mounting methods. This specification is intended to be taken as a whole and interpreted in accordance with the principles of the present disclosure and as understood by one of ordinary skill in the art.

[0017] To avoid any doubt, all the features described here likewise apply to any aspect of the present disclosure.

[0018] In the context of the present application, it is expressly provided that the various aspects, embodiments, examples and alternatives mentioned in the above paragraphs, in the claims and / or in the description and the following drawings, and in particular the individual features thereof, may be taken independently or in any combination. In other words, all of the embodiments and / or the features of any embodiment may be combined in any way, unless these features are incompatible.

[0019] To avoid any ambiguity, the terms "can", "may", "and / or", "for example", "for example" and any other similar terms used in the present document should be interpreted as nonlimiting, such that any feature described in this way does not necessarily have to be present. Specifically, any combination of optional features is expressly envisaged without departing from the scope of the claims, whether they are expressly mentioned or not.

[0020] Additionally, a person skilled in the art will appreciate that numerous variants of the embodiments described are conceivable without departing from the scope of the claims.

[0021] With reference now to figures 1 and 2, figure 1 illustrates a device for supplying power to coils for a portable electric tool 20. This portable electric tool comprises a casing 40 forming a cylinder 10 in which a movable piston 1 slides between a start position at the start of travel of the piston and an end position at the end of travel of the piston. This device comprises at least one battery intended to supply power to the coils, a first, fixed coil 4 located in the cylinder 10 at the start of travel of the movable piston 1, and a second, movable coil 5 located facing the first, fixed coil 4 and secured to the movable piston 1.

[0022] It also comprises power supply routing means 61, 62 for the second, movable coil 5, these means being secured to the piston and intended to channel the power supply from the battery so as to supply power, preferably in series, to the first, fixed coil 4 and the second, movable coil 5. Such an arrangement for supplying power to the coils consists in channelling the power supply wires of the coils via the casing and ensuring the supply of power to the latter via a scraper contact 75 between the coil and the casing 40.

[0023] In addition, each power supply routing means is configured to cooperate with connectors (71, 72), each of which is connected to one and the same terminal of the battery over at least a displacement distance X of the piston between the start position and the end position of the piston, said distance (X) being less than or equal to a distance D corresponding to the maximum distance travelled by the piston between the start position and the end position.

[0024] Preferably, the power supply routing means 61, 62 are in electrical contact with said connectors 71, 72 over a distance X equal to the length of said power supply routing means 61, 62.

[0025] According to the invention, the second, movable coil 5 is supplied with power over a distance X equal to said distance D by means of a scraper contact 75 between an internal face 401, 402 of the casing 40 and the movable coil 5.

[0026] According to one embodiment, power supply routing means 61, 62 are located on either side of the longitudinal axis 30 so as to obtain a compact device.

[0027] Optionally, the power supply routing means 61, 62 are located along the longitudinal axis 30.

Claims

1. A portable electric tool (20), said portable electric tool comprising: a power supply device for coils; and a casing (40) forming a cylinder (10) in which a movable piston (1) slides between a start position at the start of travel of the piston and an end position at the end of travel of the piston, wherein the power supply device comprises: - at least one battery intended to supply power to the coils; - a first, fixed coil (4) located in the cylinder (10) at the start of travel of the movable piston (1); - a second, movable coil (5) located facing the first, fixed coil (4) and secured to the movable piston (1); and - power supply routing means (61, 62) for the second, movable coil (5), these means being secured to the piston and intended to channel the power supply from the battery so as to supply power to the first, fixed coil (4) and the second, movable coil (5); - each power supply routing means being configured to cooperate with connectors (71, 72), each of which is connected to one and the same terminal of the battery over at least a displacement distance (X) of the piston between the start position and the end position of the piston, said displacement distance (X) being less than or equal to a distance (D) corresponding to the maximum distance travelled by the piston between the start position and the end position, wherein the second, movable coil is supplied with power over a distance equal to said distance (D) corresponding to the maximum distance travelled by the piston between the start position and the end position by means of a scraper contact (75), characterised in that the scraper contact (75) is between an internal face (401, 402) of the casing (40) and the movable coil (5).

2. The portable electric tool (20) as claimed in claim 1, characterized in that the power supply routing means (61, 62) are in electrical contact with said connectors (71, 72) over a distance equal to the length of said power supply routing means (61, 62).

3. The portable electric tool (20) as claimed in any one of claims 1 to 2, characterized in that the power supply routing means (61, 62) are located on either side of the longitudinal axis (30).

4. The portable electric tool (20) as claimed in any one of claims 1 to 2, characterized in that the power supply routing means (61, 62) are located along the longitudinal axis (30).

5. The portable electric tool (20) as claimed in any one of claims 1 to 4, characterized in that the power supply routing means (61, 62) are intended to channel the power supply from the battery so as to supply power in series to the first, fixed coil (4) and the second, movable coil (5).