QUICK-TIGHTENING DEVICE FOR A CHAIN SAW AND CHAIN UNIT FOR SAME
First Claim
1. A rapid tensioning apparatus for a chain saw with a drive unit for driving a saw chain running over a sword and over a drive pinion, whereby the drive pinion is connected via a drive shaft to the drive unit, whereby the sword is mounted on the chassis of the main body to be movable in a sliding manner on a support surface, whereby a wedge is mounted on the sword,whereby a movable tensioning lever arrangement comprising a counterwedge is mounted on the chassis in the area of the drive shaft,whereby the tensioning lever arrangement comprises a cover pivotably supported on the chassis which cover comprises an open position in which at least the saw chain and the sword are disassemblable from the main body of the chain saw, and comprises a closed position in which the saw chain rests under tension on the drive pinion and on the sword and the sword is firmly secured on the chassis of the main body,and whereby the course of the movement of the elements of the tensioning lever arrangement during the transition from the open position to the closed position is designed in such a manner that the counterwedge comes to rest above the wedge,so that the sword is secured by contact pressure on the chassis and at the same time the sword is pushed by pushing force longitudinally in a direction away from the drive pinion so that the saw chain is tensioned.
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Accused Products
Abstract
The invention relates to a rapid tensioning apparatus as well as to a chain unit and a sword suitable for it, by means of which the placing of saw chain and sword on the main body of the chain saw can be readily carried out and a tensioning of the saw chain is made possible without problems.
In the rapid tensioning apparatus a wedge is mounted on the sword of the chain saw whereas a movable tensioning lever arrangement comprising a counterwedge is positioned on the chassis in the area of the drive shaft. In a special manner the course of the movement of the elements of the tensioning lever arrangement in the transition from the open position to the closed position is designed in such a manner that the counterwedge acts on the wedge mounted on the sword and secures the sword on the chassis by contact pressure. At the same time the sword is pushed longitudinally in the direction away from the drive pinion here by the pushing pressure so that the saw chain is tensioned.
47 Citations
22 Claims
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1. A rapid tensioning apparatus for a chain saw with a drive unit for driving a saw chain running over a sword and over a drive pinion, whereby the drive pinion is connected via a drive shaft to the drive unit, whereby the sword is mounted on the chassis of the main body to be movable in a sliding manner on a support surface, whereby a wedge is mounted on the sword,
whereby a movable tensioning lever arrangement comprising a counterwedge is mounted on the chassis in the area of the drive shaft, whereby the tensioning lever arrangement comprises a cover pivotably supported on the chassis which cover comprises an open position in which at least the saw chain and the sword are disassemblable from the main body of the chain saw, and comprises a closed position in which the saw chain rests under tension on the drive pinion and on the sword and the sword is firmly secured on the chassis of the main body, and whereby the course of the movement of the elements of the tensioning lever arrangement during the transition from the open position to the closed position is designed in such a manner that the counterwedge comes to rest above the wedge, so that the sword is secured by contact pressure on the chassis and at the same time the sword is pushed by pushing force longitudinally in a direction away from the drive pinion so that the saw chain is tensioned.
Specification