A telescopic mast has a plurality of telescopic sections with longitudinally extending walls, a transverse dimension of the innermost telescopic section being smaller than the outermost telescopic section of two adjacent telescopic sections, so that the innermost telescopic section can slide longitu
A telescopic mast has a plurality of telescopic sections with longitudinally extending walls, a transverse dimension of the innermost telescopic section being 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 of two adjacent telescopic sections. A restrictor is provided between the two adjacent telescopic sections, the restrictor having a longitudinally extending linear guide provided on one of two adjacent telescopic sections and a clamping device provided on the other one of two adjacent telescopic sections, wherein the clamping device is configured for providing a clamping force to the guide during relative movement of said two adjacent telescopic sections, wherein the clamping force has two oppositely directed rotational force components in a plane normal to the longitudinal direction of the mast and perpendicular to the radius of the mast through the guide.
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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
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 two adjacent telescopic sections (4′, 4″, 4″′), wherein a restrictor (6) is provided between two adjacent telescopic sections (4′, 4″, 4″′), the restrictor (6) comprising a longitudinally extending linear guide means (8) provided on one of two adjacent telescopic sections and a clamping means (10) provided on the other one of 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) include two opposite directed rotation force components (14) in a plane normal to the longitudinal direction of the mast and perpendicular to the radius (16) of the mast (2) through the guide means (8), wherein the restrictor (6) comprises a control means (20), and wherein the control means (20) is configured for controlling the clamping force (12). 2. A telescopic mast (2) according to claim 1, wherein the control means comprise a passive actuator for controlling the clamping force. 3. A telescopic mast (2) according to claim 1, wherein the clamping means (10) is configured for providing a clamping force (12) to the guide means (8) with a centering force component (18) parallel with the direction of the radius (16) of the mast (2) through the guide means (8). 4. A telescopic mast (2) according to claim 2, wherein the control means (20) comprises a switching means (22), wherein the switching means (22) is configured for selectively clutching/declutching the clamping means (10). 5. A telescopic mast (2) according to claim 1, wherein the guide means (8) is a guide bar (24) and wherein that 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). 6. A telescopic mast (2) according to claim 5, 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) is pivotably connected to the pivot arm (32) on each side of the guide bar (24). 7. A telescopic mast (32) according to claim 6, wherein the clamping means (10) comprises at least two pivot arms (32). 8. A telescopic mast (2) according to claim 3, in combination with claim 7, wherein the control means (20) is an actuator (34), wherein the actuator (34) is in communication with the pivot arms (32), such that the pivot arms (32) rotate in opposite directions upon activation of the actuator (34). 9. A telescopic mast (2) according to claim 8, wherein the actuator (34) is a linear actuator, and that the actuator (34) is connected between the pivot arms (32). 10. Restrictor (6) for a telescopic mast (2) according to claim 1, wherein the restrictor (6) comprises a longitudinally extending linear guide means (8) provided on one of two adjacent telescopic sections and a clamping means (10) provided on the other one of 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, wherein the clamping force (12) includes two oppositely directed rotational force components (14) in a plane normal to the longitudinal direction of the mast (2) and perpendicular to the radius (16) of the mast (2) through the guide means (8), wherein the restrictor (6) comprises a control means (20), and wherein the control means (20) is configured for controlling the clamping force (12). 11. A telescopic mast (2) according to claim 4, wherein the clamping means (10) comprises at least two pivot arms, wherein the control means (20) is an actuator (34), wherein the actuator (34) is in communication with the pivot arms (32), such that the pivot arms (32) rotate in opposite directions upon activation of the actuator (34). 12. A telescopic mast (2) according to claim 9, wherein the actuator (34) is a linear actuator, and the actuator (34) is connected between the pivot arms (32). 13. A telescopic mast according to claim 1, wherein the control means comprise an active actuator for controlling the clamping force. 14. A telescopic mast according to claim 1, wherein the control means comprises a switching means, wherein the switching means is configured for selectively clutching/declutching the clamping means.
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