Cutlery – Combined cutlery or combined with ancillary feature – With means to apply transient fluid to tool
Patent
1997-02-27
1998-07-14
Bray, W. Donald
Cutlery
Combined cutlery or combined with ancillary feature
With means to apply transient fluid to tool
30383, 47 15, 47 8, 144 341, 144380, B23D 5904
Patent
active
057785376
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
It is previously known that chain saw guide bars can be provided with channels and orifices to spray the sawn surface with liquid, such as paint for colour coding or fungicide as described in patent SE 7611822-3, or both. Such guide bars are commonly used on vehicle-born chain saws.
For colour coding it is important to get distinct markings, and each liquid channel then has generally just one orifice. For spraying fungicide, it is important to cover a major part of the sawn surface, but at the same time not to spray outside that surface, which would constitute excessive waste of liquid and an environmental hazard.
In U.S. Pat. No. 5,143,131 was described a guide bar design where the liquid channel has a multitude of orifices, all of which need not be open simultaneously. The choice of which orifices are to be open is regulated with slideable metal strips with orifices forming a different pattern from the orifices in the sideplate of the guide bar. The strips are moved with an external device, such as a hydraulic actuator on the underside of the guide bar, until the desired number of orifices coincide between the strip and the sideplate. Such a device is vulnerable, however, due to the slideable strips and the unprotected location of the hydraulic actuator. It is also difficult to have a reliable indication at the operator's cab of how large a surface is being sprayed.
The present invention concerns a chain saw guide bar for fungicide spraying, where the extent of the sprayed area can be varied in relation to the size of the sawn surface, without small movable parts and without actuators at the guide bar, and where it is simple to indicate for the operator how large an area is sprayed.
DESCRIPTION OF THE INVENTION
A guide bar according to the invention is provided with orifices which give the liquid a velocity component along the plane of the guide bar, not only vertical to the plane. Such orifices are described in the patent SE 9300180-8, where they were utilized to make liquid spray from orifices near the bar centerline hit the cut surface close to the edge of the bar, to allow return of the bar as soon as the saw chain has fully penetrated the tree trunk, with a smallar angular movement than otherwise. According to that patent the liquid is given a velocity component across the bar from the centerline towards the edge.
In a guide bar according to invention, a plurality of orifices are located to give the liquid a velocity component parallel to the bar centerline. The size of this velocity component and thus the width of the sprayed area measured along the bar depends on the liquid pressure in the channels of the bar before the orifices.
The orifices are located adjacent to a pressure equalizing chamber in the guide bar, to make the spray velocity independent of the liquid flow within the channels. By measuring the liquid pressure at a pump or pressure vessel in the operator's cab, the operator can judge the width of the sprayed area. The spraying occurs during angular motion of the bar while sawing, and the pressure may be automatically controlled in relation to the position of the gripping arms of the machine holding the tree, this position indicating the diameter of the tree.
BRIEF DESCRIPTION OF THE DRAWINGS
A guide bar with spray orifices in one sideplate according to the invention is shown in FIG. 1 in a view from below, and in FIG. 2 as a cross section through the pressure equalizing chamber. If desired, the bar can be made reversible and symmetrical with two pressure chambers and orifices in both sideplates.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
The guide bar comprises two sideplates (11,12) and one center plate (13) joined by welding, brazing or adhesive. A liquid channel (14) is made as a cut-out in the center plate (13) to convey the liquid from a supply hole (15) near the clamping end (20) of the guide bar to a pressure equalizing chamber (16) with a larger cross section than the channel (14). This makes the velocity of the liquid within the chamb
REFERENCES:
patent: 4819332 (1989-04-01), Sugihara et al.
patent: 5050303 (1991-09-01), Sinclair et al.
patent: 5143131 (1992-09-01), Seigneur et al.
patent: 5426854 (1995-06-01), Leini et al.
Bray W. Donald
Sandvik AB
LandOfFree
Chain saw guide bar with liquid spray device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Chain saw guide bar with liquid spray device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chain saw guide bar with liquid spray device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1871007