US 12,291,436 B2
Bearing assembly in a mobile hydraulic crane telescopic arm and a mobile hydraulic crane comprising such assembly
Iztok Span, Ljubljana (SI); Branko Gril, Prestranek (SI); Boris Jerman, Radomlje (SI); and Luka Bizjak, Col (SI)
Assigned to TAJFUN LIV, PROIZVODNJA IN RAZVOJ D.O.O., (SI)
Appl. No. 18/000,648
Filed by Iztok Span, Ljubljana (SI); Branko Gril, Prestranek (SI); Boris Jerman, Radomlje (SI); and Luka Bizjak, Col (SI)
PCT Filed Jun. 10, 2021, PCT No. PCT/SI2021/000007
§ 371(c)(1), (2) Date Dec. 2, 2022,
PCT Pub. No. WO2021/257003, PCT Pub. Date Dec. 23, 2021.
Claims priority of application No. 202000111 (SI), filed on Jun. 19, 2020.
Prior Publication US 2023/0227292 A1, Jul. 20, 2023
Int. Cl. B66C 23/64 (2006.01); B66C 23/70 (2006.01)
CPC B66C 23/64 (2013.01) [B66C 23/701 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A bearing assembly in a mobile hydraulic crane telescopic arm, comprising:
at least two tubular bearing sections, which are inserted within each other and telescopically moveable in a controlled manner in an axial direction, wherein an outer tubular bearing section having a pre-determined length L0 and an inner tubular bearing section having a pre-determined length L1 are complementary in shape in their transversal cross-sections, having a minimal overlapping length L9 and approximately uniform spacing along a complete circumference, wherein sliding pads within each gap between adjacent bearing sections are spaced apart in the axial direction and arranged along the circumference of said sections, wherein each of said tubular bearing sections has a substantially uniform wall thickness t along the complete circumference thereof, wherein a cross-section of said tubular bearing sections is also mirror-symmetric relative to a vertical axis Z, wherein a first smaller substantially semi-circular cross-sectional area m1 of each bearing section is arranged above a neutral axis Y and at a first distance apart from said neutral axis Y, wherein a larger substantially semi-circular area m2 with a larger radius R2 is arranged below the neutral axis Y, wherein terminal points C, C′ of the larger substantially semi-circular area are arranged below the neutral axis Y and at a second distance apart from it, wherein the larger substantially semi-circular area is symmetric relative to the vertical axis Z, wherein a first pair of straight sections n2, n2′ extend from the terminal points C, C′ across said neutral axis Y to intersection points B, B′ that are a third distance from said neutral axis Y, wherein a second pair of straight sections n1, n1′ extend from the intersection points B, B′ toward terminal points A, A′ such that the second pair of straight sections n1, n1′ form an obtuse angle γ with said smaller substantially semi-circular area m1, wherein said straight sections n2, n2′ are arranged parallel with each other.