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Quick-tightening device for chain saw and chain unit for same

A technology of tensioning device and chain unit, applied in chainsaws, sawing equipment, manufacturing tools, etc., can solve problems such as difficulty in adjusting the saw chain and re-tensioning

Inactive Publication Date: 2012-02-15
HUSQVARNA AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Considering the desired easy operability, conventional chainsaws have a series of disadvantages: for example, when purchased, chainsaws are generally packaged in such a way that the blades and saw chains of the chainsaw are generally used as separate items in the packaging. The parts are placed next to the main body, so customers have to assemble these parts themselves before using the saw
Especially for inexperienced users it is often difficult to adjust the retensioning of the saw chain

Method used

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  • Quick-tightening device for chain saw and chain unit for same
  • Quick-tightening device for chain saw and chain unit for same
  • Quick-tightening device for chain saw and chain unit for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] figure 1 By way of example, a main body 1 of a chain saw is shown schematically, which has a drive unit (not shown) for driving a saw chain 8 . On the body 1 there is a lever 2 with a switch 3 for switching the drive unit on and off. The main body 1 is shown without a housing cover covering the chain drive in operation, so that the chain unit 4 including the blade 7 , the saw chain 8 and the drive pinion 5 can be seen. The drive pinion 5 is connected to the drive unit via a drive shaft 6 for driving the saw chain 12 . The wedges and spacers mounted on the blade 7 are not shown in this illustration.

[0054] figure 2 A possible advantageous embodiment of the chain unit 4 is shown in . In order to better see the individual details of the chain unit 4 , only the saw chain 8 is sketched roughly here. The saw chain 8 runs around the drive pinion 5 and the blade 7 as usual. For this reason, and for the sake of clarity, the depiction of the saw chain 8 has been complet...

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PUM

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Abstract

The invention relates to a quick-tightening device and a suitable chain unit and a blade, by means of which the saw chain and the blade can be easily attached to the main body of the chain saw and by which the saw chain can be tensioned without any problems. In the quick-tightening device a wedge is assembled on the blade of the chain saw, while a moveable clamping lever array containing a counter wedge is secured to the chassis in the region of the driveshaft. The motion sequence of the elements of the clamping lever array in the transition from the open position to the closed position is specially designed, so that the counter wedge acts on the wedge assembled on the blade and locks the blade to the chassis by means of contact pressure. At the same time, the blade is pushed by the pushing pressure in longitudinal direction away from the drive pinion, so that the saw chain is tensioned.

Description

technical field [0001] The invention relates to a quick tensioner, a chain unit and a blade for a chain saw according to the preambles of claims 1 , 17 and 18 . Background technique [0002] Known chainsaws comprise a main body with one or more levers in order to hold the chain saw in use and have a saw chain / blade arrangement which is detachably fastened to the main body. In the main body there is a drive unit, in particular an electric motor or an internal combustion engine, which drives a drive pinion connected to the saw chain for driving the saw chain. The blade is an essentially elongated, rectangular and flat body with rounded ends, which has guide grooves on its outer edge for guiding the saw chain. [0003] Considering the desired easy operability, conventional chainsaws have a series of disadvantages: for example, when purchased, chainsaws are generally packaged in such a way that the blades and saw chains of the chainsaw are generally used as separate items in th...

Claims

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Application Information

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IPC IPC(8): B27B17/14
CPCB27B17/14
Inventor 马库斯·马格迈克尔·基斯特勒
Owner HUSQVARNA AB
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