Abstract: A bumper for a suspension of a tracklaying vehicle has a first plate formed with a throughgoing hole through which engages one longitudinal end of a bolt. The other longitudinal end of this bolt is screwed into a second plate that is therefore held at a maximum spacing from the first plate. A helical compression spring having in unstressed condition an overall length greater by a predetermined distance than this maximum spacing is braced in compressed condition between the plates. Two telescoping sleeves, one fixed to each of the plates, coaxially surrounds the rod and have free ends extending past each other. Each of these ends has a respective abutment and these two abutments are spaced apart by a distance substantially equal to the difference between the length of the spring in the compressed and uncompressed condition. Thus should this rod break the two abutments will engage each other and prevent the first plate from being violently ejected.

Abstract: A seal for endless tracks formed of alternating first and second link sides articulated to one another at joints; each joint including a bushing affixed to the first link side and a pin surrounded by the bushing and affixed to the second link side and an annular recess provided in the second link side and surrounding the pin. The seal is formed by a resilient sealing ring received in the recess and surrounding the pin. The sealing ring has a first radial side and a second radial side and is axially compressed by a radial edge face of the bushing and a radial base of the recess. As a result, the first radial side is in engagement with the radial edge face of the bushing and the second radial side is in engagement with the radial base of the recess. The first radial side is concave and defines with the radial edge face of the bushing a sealed chamber. The outer peripheral face of the sealing ring sealingly engages the axial inner wall of the recess.