WO2023285242A1

WO2023285242A1 - Tip attachment

Info

Publication number: WO2023285242A1
Application number: PCT/EP2022/068760
Authority: WO
Inventors: Eberhard Heim
Original assignee: Lekisport Ag
Priority date: 2021-07-16
Filing date: 2022-07-06
Publication date: 2023-01-19
Also published as: EP4369983A1

Abstract

Tip attachment (1) for a pole, in particular for a trekking pole, cross-country-skiing pole, Nordic-walking pole or downhill-skiing pole, having a plastic sleeve (3), which can be fastened at the lower, free end of a pole tube (2) and, at an upper end, has an upwardly open hole (6, 16) for accommodating the lower, free end of the pole tube (2), and a tip insert (8) is fastened in an opening (25) at the lower end of the pole tube, characterized in that the tip insert (8) has a carrier element (9), which is releasably fastened in the opening (25) by means of a drive-in thread (19) provided on a retaining region (14) in a substantially cylindrical region (15).

Description

TITLE

TOP ATTACHMENT

TECHNICAL AREA

The present invention relates to a tip attachment for a pole, in particular for a trekking pole, cross-country skiing pole, Nordic walking pole or alpine ski pole, and a method for installing such a tip attachment and for repairing such a tip attachment.

STATE OF THE ART

Trekking poles, cross-country skiing poles, Nordic walking poles or alpine ski poles have a grip at their upper free end and a tip or a rolling surface at their lower free end.

The tips are often designed as separate plastic elements, at the lower end of which a (hard) metal tip is attached. Such tips are usually glued into the plastic or pressed in in such a way that they can no longer be removed without destroying the plastic in which they are attached.

CN203329296U describes a pole tip that has an expanding nail and an expanding nail plastic sleeve. The expansion nail is formed by a nail cap and a nail bar, with one end of the nail bar and the nail cap being fixed, and the other end of the nail bar inserted into the expansion nail plastic sleeve and connected to the expansion nail plastic sleeve. A conventional thread structure is formed on the outer wall of the nailing rod one quarter to two thirds of the total length from an end attached to the nail cap to the nailing rod. The nail rod is first nailed into the expansion nail plastic sleeve and then connected to the expansion nail plastic sleeve in a threading process. The outer wall of a nailing stick of an existing stick tip product is upgraded to have a half-threaded structure, the nailing stick is first nailed into the expanding nail plastic sleeve when installing, and then screwed. This saves installation time and improves work efficiency; the stick tip is not prone to loosening with long-term use, firm and durable.

EP-A-2 896 438 describes an interchangeable element that can be detachably attached to a free lower end of a pole tube, in particular for a trekking pole, cross-country skiing pole, Nordic walking pole or ski pole, with a tip element which has a tip, a rolling surface, at its lower end has or in its lower end a Tip is embedded, and which has an axial upwardly open blind hole for receiving the free lower end of the pole tube. The tip element is characterized in that the tip element has at least one axial slit in its upper edge, as well as a circumferential, ring-shaped cuff that at least partially encompasses the tip element, which cuff can be detachably attached to the tip element in the area of the upper edge in such a way that at least one projection on the Stock tube and/or a cross pin which is mounted in at least one hole of the stock tube transversely to the stock axis, in which at least one axial slot of the tip element is caught by the sleeve and the tip element is thereby fastened to the free end of the stick tube.

KR20090099175 provides a tip module-equipped pole that can prevent damage and abrasion of a tip by absorbing the shock applied to the tip. A stick equipped with a tip module includes: a tube; and a tip module attached to the front end of the tube. The tube has the shape that the diameter decreases from the center to the bottom. The tip module includes: a circular columnar tip; a tip holder covering the periphery of the tip; a damper that is placed on top of the tip and absorbs the shock applied to the tip; a stopper connected to the tip holder and supporting the damper; and a basket holder connecting the tip holder and the tube so that the tip holder can be placed at the bottom of the tube.

PRESENTATION OF THE INVENTION

It is accordingly an object of the present invention to provide a tip for such applications which can be easily manufactured and in which it is also possible to replace individual elements which are worn out.

The invention accordingly relates to a tip attachment according to claim 1 and a method for installing or repairing such an attachment.

Specifically, a tip attachment for a pole, in particular for a trekking pole, cross-country skiing pole, Nordic walking pole or alpine ski pole, is proposed, having a plastic sleeve that can be fastened to the lower free end of a pole tube and has a hole open at the top at an upper end for receiving the lower free end of the pole tube, and at the lower end of which a tip insert is fastened in an opening.

The proposed tip attachment is characterized according to the invention in that the tip insert has a support element with a at one Drive-in thread provided in the mounting area (which in the present case includes a press-in thread or is to be understood as a synonym for this, with pressing-in being understood as meaning a purely axial movement in the cylindrical area of the opening) in a substantially cylindrical area in the opening.

Surprisingly, it turns out that a drive-in thread or press-in thread, which is to be distinguished from a conventional thread because it has threads with different flank inclinations, although such a thread is held in the plastic sleeve without a material bond and solely by a force fit and/or form fit attached to the plastic sleeve, also for intensive use, and on the other hand, when the tip is worn out, it can be removed from the plastic sleeve again and replaced, for example, simply by turning and non-destructively. Typically, the mounting area is approx. 5-30 mm, preferably 10-20 mm long and is pressed or driven completely into an essentially cylindrical area with a slightly smaller inner diameter than the outer diameter of the drive-in thread (press-in thread) before assembly without adhesion promoter.

A first preferred embodiment is characterized in that the mounting area has at least one circumferential thread at least once (preferably at least two or at least three times), whose flat flank directed towards the upper end of the plastic sleeve encloses a smaller angle with an axis of the tip attachment than its from steep flank facing away from the upper end of the plastic sleeve.

The angle between the flat flank and the axis is preferably in the range of 5-60°, preferably in the range of 10-40°, particularly preferably in the range of 15-30°, and the angle between the steep flank and the axis is in Range of 60-90°, preferably in the range of 70-85°, particularly preferably in the range of 75-85°.

The difference in the angles between the flat flank and the axis and the steep flank and the axis is preferably in the range of 20-60°, preferably in the range of 30-50°.

Such a tip insert can be characterized in that it has a receiving opening for receiving a hard tip and such a tip at its end facing away from the plastic sleeve, the tip preferably being a tip made of a (hard) metal or ceramic fastened in the receiving opening in the form of a blind hole, preferably pressed and/or glued.

The carrier element preferably has at its end facing away from the plastic sleeve a tip widening which forms a step towards the plastic sleeve is tapered, so that a substantially radially running stop surface is formed between the mounting area and the tip extension, wherein the tip extension is preferably formed on the side facing away from the mounting area as a conically converging surface area.

The carrier element can have means for gripping an assembly tool on its area that is exposed by the plastic sleeve in the mounted state, particularly preferably in the form of gripping surfaces, preferably axially running parallel gripping surfaces, but special surfaces are also conceivable so that replacement can only be carried out with approved tools.

The mounting area is also preferably designed at its free end as a tip without a thread, with this tip preferably having a conically converging tip area and an essentially cylindrical area (typically with an axial length in the range of 2-6 mm, preferably 2-4 mm). As a result, the mounting area can first be inserted into the opening with this tip during assembly and is then guided sufficiently so that it can then be hammered in or pressed in without tilting.

A further preferred embodiment is characterized in that the essentially cylindrical area has a smaller outer diameter than the highest elevation of the thread train of the impact thread/press-in thread, and that the outer diameter of the essentially cylindrical area of the tip essentially corresponds to the inner diameter of the cylindrical area in the Opening of the plastic sleeve corresponds.

The highest elevation of the thread of the drive-in thread/press-in thread typically has an outside diameter that is larger than the inside diameter of the cylindrical area in the opening of the plastic sleeve, with the outside diameter of the thread preferably being at least 0.1 mm, preferably at least 0.5 mm, particularly preferably in the range of 0.1 - 2mm or 0.1-1mm larger than the inside diameter of the cylindrical section.

The plastic sleeve can have a radially running stop surface around the opening, the outside diameter of which essentially corresponds to the outside diameter of a radial stop surface of the carrier element.

The plastic sleeve is typically made of a thermoplastic material, preferably in an injection-molded form, which is particularly preferably a plastic selected from the following group: polyethylene, polypropylene, polyamide, polyurethane, polycarbonate, optionally with fillers and/or fiber reinforcement.

The carrier element of the tip attachment is typically made of a hard plastic (e.g. high-melting thermoplastic material such as terephthalic acid-based polyamide, optionally in glass fiber reinforced form) or metal, preferably metal, particularly preferably stainless or surface-treated, e.g. galvanized steel.

The present invention also relates to a method for assembling a tip attachment as described above, which is characterized in particular in that the plastic sleeve is presented and then the support element of the tip attachment, preferably with the tip already attached, is inserted along an axial direction into the plastic sleeve without using an adhesion promoter is hammered in or pressed in.

Afterwards or beforehand, the tip attachment can be attached to a pole. The present invention also relates to a method for replacing a tip in a tip attachment as described above, which is characterized in particular in that the tip insert is rotated out of the plastic sleeve and a replacement tip is hammered or pressed into the plastic sleeve.

Last but not least, the present invention relates to a pole, in particular a trekking pole, cross-country skiing pole, Nordic walking pole or alpine ski pole, having a tip attachment as described above.

Further embodiments are specified in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS Preferred embodiments of the invention are described below with reference to the drawings, which are for explanation only and are not to be construed as limiting. In the drawings show:

1 in a) a side view of a tip attachment according to the invention in the assembled state and in b) an axial section along A-A of the tip attachment according to a), in c) a perspective view obliquely from below and in d) a perspective view obliquely from above;

2 in a) a schematic representation of how such a tip attachment can be mounted, and in b) a schematic representation of how the tip insert can be removed from such a tip attachment; and FIG. 3 shows a carrier element for a tip insert in a perspective view obliquely from below. DESCRIPTION OF PREFERRED EMBODIMENTS FIG. 1 shows a tip attachment 1 in the assembled state in different views. The pole 2, on which such a tip attachment is typically placed, usually with an adhesive connection or press connection, is shown schematically in the side view according to FIG. 1a).

Such a tip attachment 1 has a plastic sleeve 3 which has a conical upper region 5 at the top which widens downwards and then tapers in a step 26 . This stop step 26 is usually provided so that a plate with a through opening and an internal thread can be pushed on from below and screwed on, the internal thread of such a plate then cooperating with the external thread 4 of the plastic attachment. In this case, additional locking mechanisms of such a plate can be provided, for example elastic tongues or the like, in particular a system as disclosed in WO2016/173827, for example.

While the plastic sleeve 3 has an opening 6 at the upper end for receiving a lower pipe end 2, the through-opening 16, which is particularly visible in FIG. 1b), has an essentially cylindrical area 15 at the lower end converging lower portion 7 of the plastic sleeve, a tip insert 8 is secured. The tip insert 8 consists of a carrier element 9, in the front tip of which a tip element 10 made of hard metal or ceramic is firmly embedded. For this purpose, the tip insert 8 in the carrier element 9 has a receiving opening 13, in this receiving opening the tip 10 is usually pressed and/or glued in with a conically slightly converging holding area 11, typically via a combination of adhesion and material connection.

The tip insert 8 has a conical surface area 17 which is exposed when assembled and which merges as smoothly as possible into the frontmost section of the conically converging area 7 of the plastic sleeve. For this purpose there is a stop surface 33 on the plastic sleeve around the lower opening 25 on the one hand and a stop surface 29 on the carrier element 9 on the other hand 8 into the plastic sleeve 3. The carrier element 9 now has, as can be seen for example from FIG. This drive-in thread 19 is pressed into the cylindrical area 15 in the plastic sleeve, specifically in an axial direction Driven or pressed in direction according to arrow 23.

This without the further assistance of adhesion promoters or the like. This is also easily possible in particular because the carrier element 9 has a tip 18 in its foremost or uppermost area with a conically converging area 32 which is followed by a cylindrical area 31 even before the drive-in thread 19 . The cylindrical area 31 essentially has an outer diameter that corresponds to the inner diameter of the cylindrical opening 15, and therefore the carrier element 9 is already well guided when it is pushed into the opening 15 with this area 31 and can then be moved without the risk of tilting or wedged into the plastic sleeve 3 according to arrow 23 or pressed.

The drive-in thread 19 has, as can be seen in particular from Figure 3, a thread 22 that runs around three times in this case , that is, it has a small angle to the axis 28 of the attachment. In contrast to this, the opposite thread flank 21 directed in the removal direction is designed as a steep thread flank, it has a large angle to the axis 28, close to or even at a right angle. This ensures that the carrier element with the drive-in thread can be easily hammered in, and then, after being hammered in, is securely fastened to the steep thread flanks 21 via the locking mechanism.

The great advantage of the proposed solution consists in particular in the fact that with this construction the tip insert 8 can be removed easily and non-destructively from the plastic sleeve 3 and e.g. replaced or exchanged. This is shown schematically in FIG. 2b). The tip insert can, for example, be gripped via the surface 17 or even via the flat gripping surfaces specifically provided there for tools and easily unscrewed from the plastic sleeve 3 along the arrow 24 and replaced with a new tip. If there are no specific attack surfaces, the tip insert can be held in place using a suitable tool (e.g. pliers) and unscrewed.

REFERENCE LIST

1 tip attachment 3 plastic sleeve

2 lower pipe end 4 male thread

(schematic) 5 upper area of 3 upper opening for 2 19 drive-in thread, conically converging press-in thread lower area of 3 20 flat thread flank tip insert 21 steep thread flank support element of 8 22 thread train of 19 carbide or 23 impact direction, ceramic tip press-in direction holding area of 10 24 unscrewing direction tip of 10 25 lower opening for 9

10 in 9 receiving opening, 26 stop step blind hole 27 taper in 16

Bracket area of 9 28 axis cylindrical area of 29 abutment surface through hole 30 tip extension through hole in 3 31 cylindrical area of 18 conical 32 conical converging

Surface area the area of 18 peak of 9 33 radial stop surface around 25 peak of 14

Claims

PATENT CLAIMS

1. Tip attachment (1) for a pole, in particular for a trekking pole, cross-country skiing pole, Nordic walking pole or alpine ski pole, having a plastic sleeve (3) which can be fastened to the lower free end of a pole tube (2) and which has an upper end has an upwardly open hole (6, 16) for receiving the lower free end of the pole tube (2), and at the lower end of which a tip insert (8) is fastened in an opening (25), characterized in that the tip insert ( 8) has a carrier element (9) which is detachably fastened in a substantially cylindrical region (15) in the opening (25) with a drive-in thread (19) provided on a mounting region (14).

2. Tip attachment (1) according to claim 1, characterized in that the mounting area (14) has at least one thread (22) running at least once, whose flat flank (20) directed towards the upper end of the plastic sleeve (3) has an axis ( 28) of the tip attachment (1) encloses a smaller angle than its steep flank (21) facing away from the upper end of the plastic sleeve.

3. Tip attachment (1) according to claim 2, characterized in that the angle between the flat flank (20) and the axis (28) in the range of 5-60 °, preferably in the range of 10-40 °, particularly preferably in the range of 15-30°, and the angle between the steep flank (21) and the axis (28) is in the range of 60-90°, preferably in the range of 70-85°, particularly preferably in the range of 75-85° and/or that the difference in the angles between the flat flank (20) and the axis (28) or the steep flank (21) and the axis (28) is in the range of 20-60°, preferably in the range of 30-50 ° lies.

4 tip attachment (1) according to any one of the preceding claims, characterized in that the tip attachment at its end facing away from the plastic sleeve (3) has a receiving opening (13) for receiving a hard has a tip (10) and such a tip (10), the tip (10) preferably being a tip made of metal, in particular hard metal, or ceramics, which is fastened in the receiving opening in the form of a blind hole (13), is preferably pressed and / or glued.

5. Tip attachment (1) according to one of the preceding claims, characterized in that the carrier element (9) has a tip extension (30) at its end facing away from the plastic sleeve (3) which tapers to form a step towards the plastic sleeve (3). is formed so that an essentially radially running stop surface (29) is formed between the mounting area (14) and the tip extension (30), with the tip extension (30) on the side facing away from the mounting area (14) preferably as a conically converging surface area (17 ) and/or that the carrier element (9) has means for engaging an assembly tool on its area exposed by the plastic sleeve (3) in the assembled state, particularly preferably in the form of engagement surfaces, preferably parallel engagement surfaces running axially.

6. Tip attachment (1) according to one of the preceding claims, characterized in that the mounting area (14) is designed at its free end as a tip (18) without a thread, this tip (18) preferably having a conically converging tip area (32) and an essentially cylindrical area (31) following the drive-in thread (19).

7. Tip attachment (1) according to claim 6, characterized in that the substantially cylindrical area (31) has a smaller outer diameter than the highest elevation of the thread (22) of the impact thread (19), and that the outer diameter of the substantially cylindrical Area (31) of the tip (18) essentially corresponds to the inner diameter of the cylindrical area (15) in the opening (25) of the plastic sleeve (3).

8. Tip attachment (1) according to any one of the preceding claims, characterized in that the highest elevation of the thread (22) of the Drive-in thread (19) has an outer diameter that is larger than the inner diameter of the cylindrical area (15) in the opening (25) of the plastic sleeve (3), the outer diameter of the thread (22) preferably being at least 0.1 mm, preferably at least 0.5 mm, in particular preferably in the range of 0.1-2 mm, or 0.1-1 mm larger than the inside diameter of the cylindrical portion (15).

9. Tip attachment (1) according to one of the preceding claims, characterized in that the plastic sleeve (3) has a radially running stop surface (33) around the opening (25), the outside diameter of which essentially corresponds to the outside diameter of a radial stop surface (29) of the carrier element (9) corresponds.

10. Tip attachment (1) according to one of the preceding claims, characterized in that the plastic sleeve (3) consists of a thermoplastic material, preferably in injection molded form, which is particularly preferably a plastic selected from the following group: polyethylene, polypropylene , polyamide, polyurethane, polycarbonate, optionally with fillers and/or fiber reinforcement, and/or that the carrier element (9) of the tip attachment (8) consists of plastic or metal, preferably metal, in particular steel, preferably stainless steel or surface-coated steel , especially galvanized steel.

11. A method for assembling a tip attachment (1) according to any one of the preceding claims, characterized in that the plastic sleeve (3) is presented and then the carrier element (9) of the tip attachment (8) along, preferably with the tip (10) already attached to it is hammered or pressed into the plastic sleeve (3) in an axial direction (23) without using an adhesion promoter.

12. The method according to claim 11, characterized in that the tip attachment (1) is subsequently or previously attached to a pole (2).

13. Procedure for replacing a tip on a tip attachment (1) according to one of the preceding claims 1-10, characterized in that the tip insert (8) is rotated (24) out of the plastic sleeve (3) and a replacement tip is hammered (23) or pressed into the plastic sleeve (3).

14. Pole, in particular trekking pole, cross-country skiing pole, Nordic walking pole, or alpine ski pole, having an attachment according to one of claims 1 10