CN219666442U

CN219666442U - Tool head

Info

Publication number: CN219666442U
Application number: CN202321313309.7U
Authority: CN
Inventors: 严永浦
Original assignee: Bosch Power Tools China Co Ltd
Current assignee: Bosch Power Tools China Co Ltd
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-09-12
Anticipated expiration: 2033-05-26

Abstract

The utility model relates to a tool head (10) defining a central axis extending in a longitudinal direction (L) and comprising a drive portion (12) adapted to engage a driver, a head portion (14) adapted to engage a fastener, and an intermediate portion (16) connecting the drive portion and the head portion, wherein the drive portion is connected to the intermediate portion by a first transition portion (42) tapering in the longitudinal direction from the drive portion towards the intermediate portion, the head portion is connected to the intermediate portion by a second transition portion (44) tapering in the longitudinal direction from the head portion towards the intermediate portion, the intermediate portion comprises a taper portion having a longitudinal length of more than 80% of the minimum length of the intermediate portion, both the first transition portion and the second transition portion having a concave curvature in a longitudinal section of the tool head through the central axis, the taper portion having a linear profile.

Description

Tool head

Technical Field

The present utility model relates to a tool bit, in particular for driving fasteners.

Background

Generally, the tool head includes a drive portion, a head portion, and an intermediate portion connecting the drive portion and the head portion. The drive portion is for engaging a manual drive, a mechanical drive, or an electrically or pneumatically operated drive, and the head portion may be for engaging fasteners of different sizes or types to enable rotation of the fastener with minimal force, such as loosening or tightening of the fastener.

In particular, when the tool head is used with an electrically or pneumatically operated driver, the torque from the driver to which the tool head is subjected is impulsive, which is transmitted to the head via an intermediate portion in the form of an elongate body, which drives the fastener into rotation while being subjected to torque reacted by the fastener. The torque reacted at this time is also correspondingly impulsive, with a large instantaneous magnitude, and is liable to damage the head of the tool head.

Disclosure of Invention

The object of the utility model is to reduce the reaction torque from the fastener to which the head is subjected when applying an impact torque to the driving portion of the tool head.

To this end, the utility model provides a tool head defining a central axis extending in a longitudinal direction and comprising a driving portion adapted to engage a driver, a head adapted to engage a fastener, and a middle portion connecting the driving portion and the head, wherein the driving portion is connected to the middle portion by a first transition portion tapering in the longitudinal direction from the driving portion towards the middle portion, the head is connected to the middle portion by a second transition portion tapering in the longitudinal direction from the head towards the middle portion, the middle portion comprises a taper having a longitudinal length of greater than 80% of a minimum length of the middle portion, both the first transition portion and the second transition portion having a concave curvature in a longitudinal section of the tool head through the central axis, the taper having a linear profile.

In one embodiment, the intermediate portion includes only one taper that tapers from one of the first transition portion and the second transition portion to the other of the first transition portion and the second transition portion.

In one embodiment, the taper comprises one or more tapers conically tapering in a direction from the first transition towards the second transition; and/or one or more tapers conically tapering in a direction from the second transition toward the first transition.

In one embodiment, the intermediate portion further comprises a cylindrical portion.

In one embodiment, the taper of the taper is between 1 and 4 degrees, the minimum outer diameter of the intermediate portion is between 0.9mm and 6.1mm, and the minimum length of the intermediate portion is 2mm.

In one embodiment, the drive portion comprises a first drive section and a second drive section spaced apart by a groove extending in a circumferential direction about the central axis.

In one embodiment, the head has a convex polygonal structure, or the head includes two, three, four, five, six or more ribs evenly spaced in a circumferential direction about the central axis, adjacent ribs being spaced apart by grooves.

In one embodiment, the intermediate portion and the head are a first intermediate portion and a first head; the tool head further includes a second head portion adapted to engage a fastener and a second intermediate portion connecting the drive portion and the second head portion, the first intermediate portion and the second intermediate portion extending from opposite sides of the drive portion in a longitudinal direction, respectively.

In one embodiment, the tapers constituting the first and second intermediate portions taper in opposite directions from the drive portion toward the first and second heads, respectively, or the tapers constituting the first and second intermediate portions taper in the same direction from one of the first and second heads toward the other of the first and second heads.

In one embodiment, either of the first and second heads: includes a head tip adapted to engage a fastener, a head driver adapted to engage a driver, and a head recess spacing the head tip and the head driver in a longitudinal direction.

According to the utility model, the tool head comprises a driving portion for engaging a driver and a head portion for engaging a fastener and an intermediate portion between the driving portion and the head portion, both ends of the intermediate portion being connected to the driving portion and the head portion by a first transition portion and a second transition portion, respectively. The drive portion includes at least one taper extending in a direction from one of the drive portion and the head portion toward the other, and the taper extends a majority or substantially the entire longitudinal length of the intermediate portion. The intermediate portion of the tool head of this construction is capable of optimally absorbing torque, particularly impact torque, applied to the drive portion of the tool head by the driver, avoiding the head of the tool head from experiencing excessive reaction torque from the fastener, resulting in head failure.

Drawings

Fig. 1 is a first embodiment of a tool head constructed in accordance with the utility model.

Fig. 2 is a variation of the first embodiment of the tool head.

Fig. 3 is another variation of the first embodiment of the tool head.

Fig. 4 is a further variant of the first embodiment of the tool head.

Fig. 5 is a second embodiment of a tool head constructed in accordance with the utility model.

Detailed Description

Several embodiments of the tool head of the present utility model are described in detail below with reference to the drawings. The same or corresponding parts are denoted by the same reference numerals throughout the drawings.

Referring to fig. 1, a tool head 10 for operating a fastener is generally in the form of an elongated tool body including a drive portion 12 adapted to engage a driver, a head portion 14 adapted to engage a workpiece or fastener, and an intermediate portion 16 connecting the drive portion 12 and the head portion 14. The tool head 10 defines a central axis extending in a longitudinal direction L. The longitudinal section is a longitudinally extending plane through the central axis of the tool head 10 and the cross-section is a plane through the tool head 10 perpendicular to the central axis.

In the illustrated embodiment, the drive portion 12 may have a hexagonal shape so as to be engageable with a conventional driver and upon receiving torque from the driver the tool head 10 rotates about a central axis, transmitting torque to a fastener engaged to the head 14 of the tool head 10 for synchronous rotation. The driver may be any tool, adapter or other driving means possible in the art. For example, the driver may be a driver handle or driver sleeve adapted for manual operation by an operator; for example, the driver may be an electrically or pneumatically operated driver, such as a chuck of a power tool; for another example, the drive may be a mechanical drive. The driving portion 12 may have other external shapes or configurations than a hexagonal shape for different drivers. In some embodiments, the driver may be an impact driver.

In the illustrated embodiment, the drive portion 12 of the tool head 10 includes two drive segments 24 and 26 spaced apart by a groove 22 extending in a circumferential direction perpendicular to the longitudinal direction L, the groove 22 being configured to receive a quick release structure such as a ball brake. In some embodiments, the tool head 10 may be free of grooves 22.

The head 14 includes a plurality of ribs 34 spaced about the central axis, adjacent ribs 34 being spaced apart by grooves 32. The grooves 32 and ribs 34 may extend straight along the longitudinal direction L from the tip or distal end 31 of the head 14 to engage fasteners having corresponding straight grooves; or may be curvedly elongated as shown with respect to the longitudinal direction L to accommodate fasteners having correspondingly shaped slots. In the illustrated exemplary embodiment, the radially outer surface 33 of the rib 34, while extending from the tip 31 toward the intermediate portion 16, first flares radially outwardly away from the central axis and then tapers radially inwardly toward the central axis to form a peak 35. For example, as illustrated, the head 14 may have four grooves 32 and four ribs 34 arranged alternately, thus being cross-shaped (Phillips head). In other embodiments, the number of grooves 32 and ribs 34 may be different such that head 14 may be in a straight, hexagonal, star-shaped, square, etc. configuration to engage or engage fasteners of correspondingly different configurations. In addition, the head of the tool head of the present utility model is not limited to the illustrated groove and rib configurations, but may be any convex polygonal configuration such as triangular, convex quadrilateral, convex hexagonal, etc.

In the illustrated embodiment, the intermediate portion 16 may be coupled to the drive portion 12 via a first transition 42 and may be coupled to the head portion 14 via a second transition 44. The first transition 42, the second transition 44, and the intermediate portion 16 of the tool head 10 may all have a circular cross-section. The first transition 42 extends from the drive portion 12 to the intermediate portion 16 in a tapered fashion, i.e., the first transition 42 tapers from an outer diameter at the junction with the drive portion 12 to an outer diameter at the junction with the intermediate portion 16. The first transition 42 may have a concave curvature or outer contour as shown, alternatively may be conical in shape. The second transition 44 extends from the head 14 to the intermediate portion 16 in a tapered fashion, i.e. the second transition 44 tapers from an outer diameter at the junction with the head 14 to an outer diameter at the junction with the intermediate portion 16, the second transition 15 may also have a concave curvature or outer contour as shown, or alternatively may be conical in shape of a joint.

In the embodiment of fig. 1, the intermediate portion 16 of the tool head 10 is configured as a taper having an outer contour in longitudinal section in the form of a straight line or a line, rather than in the form of a curvature, and having a first outer diameter at the junction with the first transition 42 and a second outer diameter at the junction with the second transition 44. The intermediate portion 16 tapers from the first outer diameter to the second outer diameter with a taper α, which may be between 0 and 15 degrees, preferably between 1 and 4 degrees. The second outer diameter of the intermediate portion 16 has a dimension D which may be between 0.9mm and 6.1mm, preferably between 1.5mm and 4 mm. Preferably, the minimum length of the intermediate portion 16 may be about 2mm.

Because the outer diameter of the intermediate portion 16 is smaller than the outer diameters of the two ends of the tool head 10 (the drive portion 12 and the head portion 14) and the intermediate portion 16 is configured in a tapered configuration, the intermediate portion 16 is able to better absorb (a portion of) the rotational torque, such as by deformation of the intermediate portion 16, before the rotational torque, such as an impact, is transferred via the intermediate portion 16 to a fastener engaged with the head portion 14 of the tool head 10 (and thus the head portion 14 is subjected to a reaction torque from the fastener reacting to the tool head 10), when the rotational torque is applied to the tool head 10 via a driver engaged to the drive portion 12. This greatly reduces the reaction torque experienced by the tool head 10, and in particular its head 14, acting to protect the tool head 10.

The embodiment shown in fig. 2 is a variant of the embodiment shown in fig. 1. The tool head 10 in fig. 2 differs from the tool head 10 of fig. 1 in that the drive section 12 does not include the recess 22, and the tool head 10 does not include the first transition section 42, and thus the intermediate section 16 is directly connected to the drive section 12. This configuration is most useful for a male tool bit where the overall length of the tool bit 10 is small.

Fig. 3 is another variation of the embodiment shown in fig. 1. Fig. 3 differs from fig. 1 in that the intermediate portion 16 is configured as two tapers 52 and 54 connected to each other, optionally the two tapers 52 and 54 are connected by a rounded third transition 56 having an outer curvature. The two tapers 52 and 54 may have the same or different taper parameters, such as the same or different taper, maximum or minimum outer diameter, or extension length in the longitudinal direction L. Both tapers 52 and 54 may taper as shown in a direction from the drive portion 12 toward the head portion 14, and the maximum outer diameter of the taper 54 may be greater than (as in fig. 3), equal to, or less than the minimum outer diameter of the taper 52. It is contemplated by those skilled in the art that one of the two tapers 52 and 54 may taper in a direction from the drive portion 12 toward the head portion 14 and the other may taper in a direction from the head portion 14 toward the drive portion 12. It is contemplated that the tool head 10 may include two or more tapered portions, with or without a third transition portion 56 as shown in fig. 3 disposed between adjacent tapered portions. In this case, the minimum outer diameter D of the entire intermediate portion 16 (all tapers) may be between 0.9mm and 6.1mm, preferably between 1.5mm and 4mm, and the minimum length of the intermediate portion 16 may be about 2mm.

In the embodiment shown in fig. 1 to 3, the taper of the intermediate portion 16 constituting the tool head 10 is tapered in a direction from the drive portion 12 towards the head 14, which is highly advantageous in reducing the torque shock transmitted to the head 14. However, those skilled in the art will appreciate that the present utility model is not limited to a configuration in which the taper constituting the intermediate portion 16 tapers in this direction. Fig. 4 is a further variant of the embodiment shown in fig. 1. In fig. 4, the head 14 has a different structure, and the taper constituting the intermediate portion 16 tapers from the junction with the second transition 44 to the junction with the first transition 42 in a direction from the head 14 toward the drive 12. The recess 22 of the drive portion 12 further comprises a further recess 28 recessed radially from the outer surface of the recess 22. Alternatively, the present tool head 10 may not include the second transition 44.

A tool head comprising a head is described above with reference to figures 1-4. The intermediate portion 16 of the tool head includes at least one taper, for example, may include two or more tapers. Alternatively, depending on the application, the intermediate portion 16 may comprise: the one or more first tapered portions that taper linearly in a direction from the driving portion 12 toward the head portion 14, the one or more second tapered portions that taper linearly in a direction from the head portion 14 toward the driving portion 12, and the one or more cylindrical portions, which may be connected in series in any order in the longitudinal direction L.

Fig. 5 shows an embodiment of a tool head comprising two heads. In the present embodiment, the tool head 10 includes: a driving portion 12 adapted to engage a driver (in this embodiment, the driving portion 12 does not include the recess 22 of fig. 1), a first intermediate portion 16a extending from a first side of the driving portion 12 along the longitudinal direction L, a first head portion 14a connected to the first intermediate portion 16a and adapted to engage a fastener, a second intermediate portion 16b extending from an opposite second side 12b of the driving portion 12 along the longitudinal direction L, and a second head portion 14b connected to the second intermediate portion 16b and adapted to engage a fastener.

The first intermediate portion 16a and the second intermediate portion 16b each have the structure of the intermediate portion 16a of fig. 1. The first intermediate portion 16a is connected to the drive portion 12a and the first head portion 14a by first and second transition portions 42a and 44a, respectively, the first intermediate portion 16a tapering from a connection with the first transition portion 42a toward a connection with the second transition portion 44 a. The second intermediate portion 16b is connected to the drive portion 12b and the second head portion 14b by third and fourth transition portions 42b and 44b, respectively, the second intermediate portion 16b tapering from a junction with the third transition portion 42b toward a junction with the fourth transition portion 44 b.

In the second embodiment of fig. 5, each of the first head 14a and the second head 14b includes engagement tips 15a and 15b, head drives 17a and 17b, and are spaced apart in the longitudinal direction L by grooves 19a and 19b extending in the circumferential direction. This head structure is also suitable for use with the tool head 10 of fig. 1-4.

The tool head of the utility model, the drive portion and the head portion are connected by a middle portion comprising a tapered portion, the longitudinal length of the tapered portion being greater than 50%, preferably greater than 60%, preferably greater than 80%, more preferably greater than 90%, most preferably the longitudinal length of the tapered portion being equal to the longitudinal length of the middle portion. When the tool head drive portion is subjected to an impact torque, the intermediate portion is susceptible to deformation, which reduces the amount of deformation or breaking force or torque to which the tool head portion may be subjected (from the fastener).

In use, a drive source engaged with the tool head 10 may engage the illustrated drive portion 12 of the tool head 10, at which time the tapered portions forming the first and second intermediate portions 16a, 16b, respectively, as illustrated, advantageously taper conically in a direction from the drive portion 12 toward the first and second heads 14a, 14b. Alternatively, in use of the tool head 10, one of the first head 14a and the second head 14b (i.e. the head driver 17a or 17 b) may act as a driver, engaging the drive source and receiving a rotational torque, and the intermediate portion of that head for engaging the drive source may be designed to taper from that head towards the other head, such that both the first and second intermediate portions taper in the same direction from that head towards the other head, which is more advantageous for damping the received impact rotational torque.

While specific embodiments of the tool head of the present utility model have been described above with respect to fig. 1-5, it should be understood that these embodiments are illustrative and are not intended to limit the scope of the present utility model. It is also to be understood that different features of different embodiments may be recombined with each other to form new embodiments. Accordingly, various modifications, adaptations, and combinations of the features of the described embodiments can be made without departing from the scope of protection as defined in the claims.

Claims

1. A tool head (10) defining a central axis extending in a longitudinal direction (L) and comprising a drive portion (12) adapted to engage a driver, a head portion (14) adapted to engage a fastener, and an intermediate portion (16) connecting the drive portion and the head portion, characterized in that the drive portion is connected to the intermediate portion by a first transition portion (42) extending in the longitudinal direction from the drive portion tapering towards the intermediate portion, the head portion is connected to the intermediate portion by a second transition portion (44) extending in the longitudinal direction from the head portion tapering towards the intermediate portion, the intermediate portion comprises a taper portion having a longitudinal length of greater than 80% of the minimum length of the intermediate portion, both the first transition portion and the second transition portion having a concave curvature in a longitudinal section of the tool head through the central axis, the taper portion having a linear profile.

2. The tool head (10) according to claim 1, wherein the intermediate portion includes only one taper extending conically from one of the first transition and the second transition to the other of the first transition and the second transition.

3. The tool head (10) according to claim 1, wherein the taper comprises one or more tapers conically tapering in a direction from the first transition towards the second transition; and/or one or more tapers conically tapering in a direction from the second transition toward the first transition.

4. A tool head (10) according to claim 3, wherein the intermediate portion further comprises a cylindrical portion.

5. The tool head (10) according to claim 1, characterized by at least one of the following: the taper of the taper is between 1 and 4 degrees, the minimum outer diameter of the intermediate portion is between 0.9mm and 6.1mm, and the minimum length of the intermediate portion is 2mm.

6. The tool head (10) according to claim 1, wherein the drive portion comprises a first drive section (24) and a second drive section (26) separated by a groove (22) extending in a circumferential direction about the central axis.

7. Tool head (10) according to claim 1, characterized in that,

the head having a convex polygonal configuration, or

The head includes two, three, four, five, six or more ribs (34) evenly spaced in a circumferential direction about the central axis, adjacent ribs being spaced apart by grooves (32).

8. The tool head (10) according to any one of claims 1-7, wherein the intermediate portion and the head are a first intermediate portion and a first head; the tool head further comprises a second head portion adapted to engage a fastener and a second intermediate portion connecting the driving portion and the second head portion, the first intermediate portion and the second intermediate portion respectively protruding from opposite sides of the driving portion in the longitudinal direction (L).

9. The tool head (10) according to claim 8, wherein the tapers constituting the first and second intermediate portions taper in opposite directions from the drive portion toward the first and second heads, respectively, or the tapers constituting the first and second intermediate portions taper in the same direction from one of the first and second heads toward the other of the first and second heads.

10. The tool head (10) according to claim 9, wherein either of the first and second heads: comprises a head tip adapted to engage a fastener, a head driver adapted to engage a driver, and a head recess spacing the head tip and the head driver in a longitudinal direction (L).