Patent ID: 9587411
Date: 2017-03-07
CPC Classifications: E04H,F16B,F16M

Claim:
1. A telescopic mast ( 2 ) comprising a plurality of telescopic sections ( 4 ′, 4 ″, 4 ′″) each with walls extending in the longitudinal direction of the mast ( 2 ), where the transverse dimension of the innermost telescopic section is smaller than the outermost telescopic section of two adjacent telescopic sections, so that the innermost telescopic section can slide longitudinally in and out of the outermost telescopic section of the two adjacent telescopic sections ( 4 ′, 4 ″, 4 ′″), wherein a restrictor ( 6 ) is provided between the two adjacent telescopic sections ( 4 ′, 4 ″, 4 ′″), the restrictor ( 6 ) comprising a longitudinally extending linear guide means ( 8 ) provided on one of the two adjacent telescopic sections and a clamping means ( 10 ) provided on the other one of the two adjacent telescopic sections, wherein the clamping means ( 10 ) is configured for providing a clamping force ( 12 ) to the guide means ( 8 ) during relative movement of said two adjacent telescopic sections ( 4 ′, 4 ″, 4 ′″), wherein the clamping force ( 12 ) includes two opposite directed rotation force components ( 14 ) in a plane normal to the longitudinal direction of the mast and perpendicular to a radius ( 16 ) of the mast ( 2 ), wherein the restrictor ( 6 ) comprises a control means ( 20 ), wherein the control means ( 20 ) is configured for controlling the clamping force ( 12 ), wherein the guide means ( 8 ) is a guide bar ( 24 ) and wherein the clamping means ( 10 ) comprise at least two sliding shoes ( 26 ), wherein the guide bar ( 24 ) has two longitudinally extending abutment surfaces ( 28 ) configured for receiving the clamping force ( 12 ), and wherein each sliding shoe ( 26 ) has a complimentary slide surface ( 30 ) adapted for transferring the clamping force ( 12 ) to a respective one of said abutment surfaces ( 28 ), wherein the clamping means ( 10 ) comprises a pivot arm ( 32 ), wherein the pivot arm ( 32 ) is pivotable about the radius ( 16 ) of the mast ( 2 ) through the guide means ( 8 ), and wherein a sliding shoe ( 26 ) of the at least two sliding shoes ( 26 ) is pivotably connected to the pivot arm ( 32 ) on each side of the guide bar ( 24 ).