Power tool with a tensioning device for a belt
AssigneeMakita Corporation
InventorsManfred Doering, Cavit Dogan
Life of this patent
Estimating the term…
Abstract
A power tool and a belt pulley of a belt drive for a power tool is provided with a tool driven by a motor by way of a belt drive, whereby the belt drive has a belt pulley rotating about a drive axle on the drive side and a belt pulley rotating about a tool axle on the tool side, and whereby a belt can be tensioned over the belt pulleys. At least one of the belt pulleys can be moved into an eccentric position in relation to its holding axle, with an assembly element being provided, with which the belt pulley can be returned into the concentric position in relation to the axle.
Claims13
A power tool with a motor and with a tool driven by the motor by way of a belt drive, the belt drive comprising:
- a drive side belt pulley rotating in a drive axle;
- a tool-side belt pulley rotating in a tool axle;
- and
- a belt tensioned over the belt pulleys;
- wherein:
- at least one of the belt pulleys is movable into an eccentric position in relation to the axle on which the at least one of the belt pulleys is held;
- and
- an assembly element is provided on the tool axle, the assembly element being pivotable around the tool axle and having an eccentric cam, the at least one of the belt pulleys being movable to a concentric position in relation to the tool axle by turning the assembly element about the tool axle and through pre-tensioning the belt.
A belt pulley of a belt drive for a power tool, whereby the belt drive has a drive side belt pulley rotating about a drive axle and a tool side belt pulley rotating about a tool axle, wherein at least one of the belt pulleys has an elongated hole through which the corresponding axle is passable, the at least one of the belt pulleys is mountable on the corresponding axle and movable along the elongated hole on the corresponding axle between an eccentric and a concentric position in relation to the corresponding axle wherein an assembly element is provided on the corresponding axle and which is pivotable around the corresponding axle wherein the assembly element has an eccentric cam, by means of which the at least one of the belt pulleys is movable between the eccentric and the concentric position in relation to the corresponding axle by turning the assembly element about the corresponding axle.
A method of fitting a belt of a belt drive between a motor and a tool of a power tool, the belt drive having a drive side belt pulley rotating about a drive axle and a tool side belt pulley rotating about a tool axle the method comprising:
- moving at least one of the belt pulleys from a concentric position in relation to the axle on which the belt pulley is held in to an eccentric position,
- fitting of a belt on the belt pulleys, and
- returning the belt pulley into a concentric position in relation to the axle on which the belt pulley is held, whereby the belt is pre-tensioned, wherein an assembly element having an eccentric cam is provided on the corresponding axle, whereby the assembly element is pivotable about the corresponding axle so that by means of the eccentric cam the belt pulley is returned into the concentric position.
Dependencies are inferred from the claim text.