Abstract: The invention concerns a method for the manufacture of a rivet for a fixed spike or for a sleeve-mounted spike, respectively, by pressing in a mold. In the method of the invention, the cavity space in the mold (10,20), corresponding to the shape of the spike to be manufactured, is first filled to the desired extent with a first material (1) to form the body part of the spike. Thereupon a first punch (30), whose diameter is substantially smaller than the diameter of the cavity space in the mold, is fitted into the cavity space concentrically with the cavity space, and the annular space between said first punch (30) and the cavity space is filled with a second material (20) so as to form the wear-resistant surface layer for the spike. Next, the first punch (30) is removed, and the space remaining after said punch is filled with a third material. Ultimately the spike is pressed to the desired shape and density, whereinafter the spike is removed from the mold.

Abstract: A testing device for vehicle tires, especially anti-skid features situated in the vehicle tire, in which the tire to be tested is pressed against an outer circle or surface of another tire, while these two tires are rotated in opposite directions. The other tire acting as a counterpart or pair for the tire being tested is a pneumatic tire, while the tire to be tested and the other tire are disposed to be pressed against one another so that a contact surface between the two tires is substantially straight. The other tire acting as the pair or counterpart for the tire to be tested is provided with a wear surface having good wear resistance properties.

Abstract: The invention concerns a sleeve-mounted spike (10) fitted on a vehicle tire, comprising a rivet (11), a head (12), a tip (13) and a sleeve (14). The clearance (15) between the sleeve (14) and the rivet (11) increases in the direction towards the tip (13). The sleeve (14) has been shaped so that the hole in the sleeve (14) for the rivet (11) has been disposed to increase in diameter towards the tip (13).

Abstract: The present invention concerns a fixed spike or a sleeve-mounted spike, fitted on a vehicle tire. The flange (12) and the body (11) of the fixed spike or the sleeve-mounted spike (20) or the flange of the rivet and the sleeve, are shaped at least in the part of the flange (12) and of the body part (11) facing the flange (12) or in the part of the flange of the rivet and the sleeve facing the flange of the rivet, in such manner that the fixed spike (10) or the sleeve-mounted spike has no detrimental sharp discontinuities (11d,12d).

Abstract: The invention concerns a sleeve-mounted spike (10) fitted on a vehicle tire, comprising a rivet (11), a head (12), a tip (13) and a sleeve (14). The part (11a) of the rivet towards the tip and the part (11b) towards the head subtend an angle (.alpha.) having a magnitude in the range from 150 to 179 degrees, whereby no rectilinear contact is established between the rivet (11) and the sleeve (14), as a result of which when the rivet (11) is urged against the sleeve (14) in vehicle acceleration, braking or sideslipping situations a greater force is required to push the rivet (11) into the tire rubber, however without arresting the movement of the rivet (11) within the sleeve (14).

Abstract: The present invention concerns a sleeve-mounted spike. The sleeve (14) of the substantially symmetric sleeve-mounted spike (10) is provided with an oblique hole (15) for a rivet, the sleeve-mounted spike (10) being arranged, at first contact with the road surface (18), to meet the surface of the road (18) in a substantially upright position.