EP3854462A1

EP3854462A1 - Ice screw

Info

Publication number: EP3854462A1
Application number: EP21153090.2A
Authority: EP
Inventors: Oliviero GOBBI
Original assignee: Grivel SRL
Current assignee: Grivel SRL
Priority date: 2020-01-24
Filing date: 2021-01-22
Publication date: 2021-07-28
Anticipated expiration: 2041-01-22
Also published as: EP3854462C0; EP3854462B1; IT202000001423A1

Abstract

Described herein is an ice screw comprising a hollow screw portion (2) provided with a threading (3) formed on an outer surface (4). The screw portion comprises a terminal portion (7) made of a first metal, preferably steel, and a body portion (8) made of a second metal lighter than said first metal, preferably aluminium. The screw portion further comprises an open ring (20) made of magnetic polymeric material.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent application claims priority from Italian patent application no. 102020000001423 filed on January 24, 2020 .

TECHNICAL FIELD

The present invention relates to an ice screw.

STATE OF THE PRIOR ART

Ice climbing is a very popular sport. Climbers climbing ice walls use a number of safety systems to provide protection against falls. In particular, a number of ice screws, each with an associated karabiner, and a safety rope passing through each karabiner are used. In case the climber loses his/her grip, the rope ensures that the climber's fall stops at the ice screws.
Ice screws consist of a hollow cylindrical body that is externally threaded like a screw. The ice screw has a first grooved end that forms a toothed profile, generally with a number of spikes along the circumference and adapted to be engaged on the ice surface, and an end provided with a grip portion which protrudes from the screw itself, integral with the screw and suitable to be gripped by the user to facilitate screwing. Examples of known types of ice screws include Patents US5782442 , US5118061 .
The most common ice screws are made entirely of steel to ensure maximum grip in the ice, which is why they are heavy and bulky.
For this reason, lighter aluminium screws were tested. However, aluminium does not allow proper screwing into the ice, moreover, screws made of aluminium bend more easily and therefore may not ensure the necessary safety features required for ice climbing.
Therefore, there is an ongoing search for alternative and better solutions for making ice screws.

OBJECT OF THE INVENTION

The object of the present invention is to obtain an ice screw, which allows the above-mentioned problem to be solved, is therefore easy to assemble, and has the qualities of a steel screw and the lightness of an aluminium screw.
According to the present invention, this object is achieved by means of an ice screw according to claim 1.
A further object of the present invention is to obtain an easier method for assembling an ice screw.
According to the present invention, this object is achieved by means of a method for assembling an ice screw according to claim 10.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the present invention, it will now also be described with reference to the accompanying drawings, wherein:

Figure 1 is a schematic side view of a preferred embodiment of an ice screw;
Figure 2 is a schematic side view of a preferred embodiment of an enlarged terminal portion of the ice screw in Figure 1;
Figure 3 is an exploded schematic side view of a preferred embodiment of the ice screw in Figure 1 broken down into its component parts; and
Figure 4 is a bottom view of the terminal portion of the ice screw in Figure 3.

DESCRIPTION OF THE INVENTION

In Figure 1, the numeral 1 indicates, as a whole, an ice screw comprising a hollow screw portion 2 having a preferably circular cross-section and provided with a threading 3 formed on a smooth, bottom outer surface 4, and a grip portion 5, which may have any shape that is suitable to facilitate the gripping of the screw.
The screw portion 2, in use, is screwed into the ice, which is facilitated by the grip portion 5 and the threading 3.
The grip portion 5 is used to grip the screw and facilitate the screwing into the ice and is usually provided with a crank 6, in some models a foldable crank, merely by way of example as shown in Figure 1.
As also shown in greater detail in Figure 2, the screw portion 2 of the ice screw 1 comprises a terminal portion 7, preferably made of a first metal, more preferably made of steel, or with a Mohs hardness greater than 3.5, more preferably greater than 4 and even more preferably between 4 and 4.5, and a body portion 8, preferably made of a metal lighter than the first metal, more preferably made of aluminium, or with a Mohs hardness of less than 3.5, more preferably less than 3, even more preferably between 2.5 and 3.
"Lighter" is therefore intended to mean a lower hardness index on the Mohs scale. "Hardness" is used with its usual meaning, i.e., the metal's resistance to permanent deformation.
The terminal portion 7 comprises a threading 9 connected to the threading 3 of the body portion and formed on a smooth bottom surface 10, and an end portion 11 provided with a toothed or saw-toothed profile 12. The toothed profile 12 is preferably formed by a plurality of spikes 13.
Preferably, the toothed profile comprises a number of spikes 13 comprised between 2 and 8, more preferably 4 or 5.
Preferably, the spikes 13 have a triangular shape, more preferably the spikes 13 approximately have the shape of a right-angled triangle.
The threading 9 of the terminal portion 7 advantageously follows the threading 3 of the screw portion 2.
For this purpose, during the manufacturing of the ice screw 1, the terminal portion 7 and the body portion 8 are joined so that there are no discontinuities between the threadings 3, 9 and neither between the respective bottom surfaces 4, 10, as schematically shown in Figure 2.
As shown in Figure 3, the screw portion 2 is formed or assembled starting from three distinct elements.
The terminal portion 7, the body portion 8 and an open ring 20.
The body portion 8 is formed by a first region 21 provided with a threading 3 and having a first external diameter and by a second region 22, also called a male region for coupling to the terminal portion 7 and having a second external diameter smaller than the first diameter. In fact, the second region 22 allows a male-female coupling to a corresponding region of the inner surface of the terminal portion 7.
The internal diameter of both regions 21 and 22 is such that once the screw portion 2 has been assembled it is substantially the same at both regions 21, 22, so as to ensure that the inner surface of the screw portion 2 is coplanar, uniform and smooth in order to facilitate the sliding of the ice inside the screw during the screwing process.
The second region 22 therefore has an outer surface 23 having a shape suitable to ensure coupling to an inner surface of the terminal portion 7.
For this purpose, the outer surface 23 of the second region 22 preferably has a surface with a non-regular and therefore non-polygonal geometric shape. More preferably, it has at least one flat portion 24, even more preferably at least two flat portions 24, 25. Even more preferably, the two flat portions 24, 25 have different sizes.
The flat portion(s) 24, 25 is/are formed externally on the outer surface and is/are at respective flat portions having the same shape and size and formed on the inner surface of the terminal portion 7, as shown in Figure 4.
As shown in Figure 4, the terminal portion 7 has, on the inside thereof, a smooth region having an internal diameter equal to the internal diameter of the first region 21 of the body portion 8, and a coupling region 36 having an inner surface 37 having a shape and size corresponding to the outer surface 23 of the second region 22 of the body portion 8 so as to be able to provide a male-female coupling in one mandatory configuration.
In fact, when the screw portion 2 is interference assembled by threading the second region 22 into the terminal portion 7, there is only one assembly configuration or position which ensures the continuity of the threading 3 of the body portion 8 with the threading 9 of the terminal portion 7.
The one and only assembly position is ensured by the fact that the outer surface of the second region 22 and the coupling region of the inner surface of the terminal portion 7 do not have a regular shape, such as a polygonal shape, and therefore the two portions cannot be coupled to each other in a different configuration from that which makes the flat portions 24,25 on the outer surface of the second region 22 correspond to those at the inner surface of the terminal portion 7.
In the preferred embodiment shown in Figures 3 and 4, the outer surface 23 of the second region 22 has 4 flat portions designated by the reference numerals 24, 25, 26, 27, respectively, each one having a different size.
Preferably, the flat surfaces 24, 25, 26, 27 of the outer surface 23 of the second region 22 are joined together by curved portions 28, 29, 30, 31, having a curved profile corresponding to that of the screw portion 2.
The coupling region 36 of the terminal portion 7 comprises at least one, preferably two, even more preferably, as shown in Figure 4, four flat portions 38, 39, 40, 41 on the inner surface of the coupling region, as also shown in the bottom section view of the terminal portion 7 in Figure 4, also joined together by respective curved portions 42, 43, 44, 45.
The profile of the outer surface of the second region 2 therefore corresponds to the profile of the inner surface of the coupling region 36 of the terminal portion 7.
More advantageously, the second coupling region 22 on the screw portion 2 further comprises a groove 50 adapted to house an open ring 20.
According to a first preferred embodiment, the open ring 20 is made of magnetic material, preferably a metallic material, and therefore can close or open elastically like a spring.
According to a second preferred embodiment, the open ring 20 is made of polymeric material, preferably a thermoplastic material, and therefore can close or open elastically like a spring.
The method for assembling the screw portion 2 comprises a first step wherein the open ring 20 is arranged into the groove 50, then the terminal portion 7 is assembled onto, or in other words threaded into or coupled to the second region 22 of the body portion 8.
The coupling takes place in such a way that the terminal portion 7 tightens the ring on the groove in order to facilitate the coupling thereof. When the terminal portion is in place, the open ring, as it is provided with elasticity due to the material of which it is made, tends to open, abutting against the inner surface 37 of the coupling region 36, eliminating the clearance and thus preventing, in use, the terminal portion from unthreading.
The presence of the ring 20 also allows not only to ensure the tightness, in use, of the coupling between the terminal portion 7 made of the first metal, in particular of steel, and the body portion 8 made of the lighter metal, in particular of aluminium, but also has the advantage of allowing the replacement of the terminal portion in case of wear.
In fact, according to the first embodiment, by inserting into the screw portion 2 a magnetic element capable of attracting the magnetic material of which the open ring 20 is made, the ring itself tightens by completely entering the groove 50, thus allowing the terminal portion 7 to be unthreaded from the body portion 8. Therefore, a new terminal portion 7, for example with non-worn spikes, can be inserted by the same method used for the first assembly of the ice screw.
The advantages enabled by the ice screw manufactured according to the present invention will be apparent from an examination of the features thereof.
In particular, the ice screw combines the lightness of aluminium with the mechanical characteristics of steel, which makes it easily screwable into the ice. At the same time, in case of wear, the tip can be easily replaced, yet the coupling of the terminal portion is ensured in an optimal way.

Claims

An ice screw (1) comprising a hollow screw portion (2) provided with a threading (3) formed on an outer surface (4), said screw portion comprising a terminal portion (7) made of a first metal and a body portion (8) made of a second metal lighter than said first metal and an open ring (20) made of polymeric material or magnetic material.
The ice screw (1) according to claim 1, characterised in that said first metal is steel or has a Mohs hardness greater than 3.5.
The ice screw (1) according to claim 1, characterised in that said second metal is aluminium or has a Mohs hardness of less than 3.
The ice screw (1) according to any one of the preceding claims, characterised in that said terminal portion (7) comprises a threading (9) and an end portion (11) provided with a toothed profile (12).
The ice screw (1) according to any one of the preceding claims, characterised in that said body portion (8) is formed by a first region (21) having a first external diameter and by a second region (22) having a second external diameter smaller than the first diameter.
The ice screw (1) according to any one of the preceding claims, characterised in that said second region (22) has an outer surface (23) and in that said terminal portion (7) has, on the inside thereof, a coupling region (36) having an inner surface (37) having a shape and size corresponding to the outer surface (23) of the second region (22) of the body portion (8) so as to be able to carry out a coupling of the body portion (8) with the terminal portion (7).
The ice screw (1) according to any one of the preceding claims, characterised in that said outer surface comprises at least one flat portion (24).
The ice screw (1) according to any one of the preceding claims, characterised in that said open ring (20) is made of magnetic material or polymeric material.
The ice screw (1) according to any one of the preceding claims, characterised in that said second region (22) comprises a groove (50) adapted to house said open ring (20) .
A method for assembling an ice screw according to claim 8 comprising a first step wherein said open ring (20) is arranged into the groove (50) and a second step wherein the terminal portion (7) is threaded into the second region (22) of the body portion (8).