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Snap action mechanism to facilitate chain attachment/detachment of chainsaws

A chain and attachment technology, which is applied in the chain mechanism and the field of automatic tensioning chain saw chain, can solve the problem of saw chain slack

Active Publication Date: 2016-08-17
HUSQVARNA AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a design will tension the saw chain with a force proportional to the actual cutting force, but the design will cause the saw chain to slack when the chain is not running

Method used

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  • Snap action mechanism to facilitate chain attachment/detachment of chainsaws
  • Snap action mechanism to facilitate chain attachment/detachment of chainsaws
  • Snap action mechanism to facilitate chain attachment/detachment of chainsaws

Examples

Experimental program
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Embodiment Construction

[0085] figure 1A chainsaw according to an exemplary embodiment of the present invention is shown. The chain saw comprises a housing 1 and a cutting unit. The casing encloses a prime mover (not shown). In various embodiments of the invention, the prime mover may comprise an electric motor or an internal combustion engine. In an embodiment of the present invention, the motor may be an electric motor, such as but not limited to an AC motor, a DC motor, and the like. In an embodiment of the invention, the motor may optionally be powered by a rechargeable power source, such as a battery or battery also enclosed in the housing (not shown in figure 1 shown in )) to supply electrical energy. Furthermore, the cutting unit comprises a guide rod 2 attached to the housing 1 and extending along the longitudinal axis A. As shown in FIG. Where the prime mover is a combustion engine, the guide rod is preferably attached to the crankcase. The cutting unit also comprises a chain 3 support...

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PUM

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Abstract

In order to facilitate the removal of the chain (3) from the chain saw, the saw has a lever arm, preferably in the form of a hinged cover (11), which is arranged to direct the sprocket (15) towards the guide bar ( 2) Shift. When the cover (11) is closed, the sprocket (15) is displaced in the opposite direction to pretension the chain (3). The sprockets (15, 115) can be driven over a gear drive (27, 127) which uses the force generated when the chain (3, 103) is running at normal cutting speeds to pass through the sprockets (15, 115 ) moves away from the guide bar (2, 102) to automatically tension the chain (3, 103). A ratchet mechanism (34) may be provided to maintain tension in the chain by preventing the sprocket (15) from moving towards the guide bar (2) as the chain speed decreases. Alternatively, the mechanism for automatically tensioning the chain (3, 238) of the chainsaw comprises a drive inner sprocket (76, 201), and an outer ring (77, 204) surrounding the inner sprocket (76, 201) ). Springs (64, 87, 228) may be provided to assist the ratchet mechanism or as an alternative to the ratchet mechanism.

Description

technical field [0001] The present invention relates to a snap action device for facilitating the attachment / detachment of a saw chain of a chainsaw, said chainsaw further comprising a guide bar for guiding the chain and a rotatable chain guide, and a drive for driving the chain sprockets. [0002] Furthermore, the invention relates to a mechanism for automatically tensioning the chain of a chain saw having a saw chain, a guide bar for guiding the chain and a rotatable chain guide, a driven output shaft, and a The output shaft is connected to the gear transmission of the chain guide. [0003] The invention also relates to a method of automatically tensioning the chain of a chain saw having a saw chain, a guide bar for guiding the chain and a rotatable chain guide, a driven output shaft, and a The output shaft is connected to the gear transmission of the chain guide. Background technique [0004] WO 2010 / 105809 Al discloses a quick tightening device and a suitable chain un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27B17/14B27B17/06
CPCB27B17/14F16H7/08
Inventor 迈克尔·基斯特勒马库斯·马格克里斯托夫·席特佩尔·马丁松乔基姆·佩尔松迈克尔·特雷弗尼克·唐斯
Owner HUSQVARNA AB