Printing – Stenciling – Stencils
Patent
1979-12-10
1982-11-09
Taylor, Billy S.
Printing
Stenciling
Stencils
69 193, B05C 1706
Patent
active
043578691
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention refers to a device for stretching and fixing a cloth such as a screen-, strainer-, bolting-, filter cloth or similar material on a frame of the kind comprising a frame-shaped stand, a pressure plate movable in the border of the stand and extending over an essential part of said border and at least one member acting upon the pressure plate for displacing the pressure plate towards the cloth.
When mounting cloths of the above mentioned kind it is important that the cloth is stretched regularly over the whole surface area. For small frames the stretching and fixing have been made manually and inevitable irregularities following such a manual operation had to be tolerated. For large frames including several square meters pneumatic frame stretching devices have been used, which by means of a great number of pneumatic stretching means stretches the cloth until the sufficient stretching force is obtained. With these machines a good result is obtained, but the fixing of a great number of stretching means is difficult and very time-requiring. Moreover such machines are very expensive and require a large space. An example of such a device is described in the Swiss patent specification No. 402.790.
In the German Auslegeschrift No. 2.020.958 is described a device of the kind mentioned above, which however has certain drawbacks. Thus the pressure plate can be displaced only perpendicular to the guides in the frame. By reason of that the pressure plate cannot compensate possible irregularities of the stretching of the cloth against the frame.
In the U.S. Pat. No. 1,778,385 a device for stretching a skin against a stencil is described, at which pneumatic pads are used. The purpose is to make the stencil lie tightly against the skin, thus preventing the dye or other colouring material used from running underneath the stencil. This device is accordingly intended for a quite different purpose and for a different technical field than the device according to the invention.
BRIEF SUMMARY OF THE INVENTION
The purpose of the present invention is to provide a device, which facilitates the procedure of stretching and fixing the cloth and which by simple means and at a reasonable price gives a perfect result. It is an important condition that the pressure plate can be adapted also to irregularly mounted cloths.
This has according to the invention been achieved by the fact that the frame-shaped stand is provided with a bottom, that said member comprises at least one pad inflatable with a fluid and arranged between the bottom of the stand and the pressure plate, which is so much smaller than the border of the stand that the pressure plate is adjustable in different angles in relation to the bottom and that on the upper edge of the border of the stand a clamping device is attachable for clamping the cloth on all sides against the border, said clamping device comprising a frame, which by means of tightening means can be pressed against the stand.
DESCRIPTION OF THE DRAWINGS
The invention will now be further described with reference to an embodiment shown in the accompanying drawing.
FIG. 1 is a top plan view of the device according to the invention,
FIG. 2 is a cross section taken along line II - II in FIG. 1, and FIG. 3 is a cross-sectional view of another embodiment of the pneumatic pad employed in the invention.
DETAILED DESCRIPTION
The stretching and fixing device according to the invention comprises a box-shaped stand 11 comprising a rectangular border 12, a perforated bottom plate 13 and an underframe 14. A clamping device 16 can by clamps of tightening means 15, 15' be pressed against the upper edge of the border 12, which is made of square tubes.
The clamping device 16 comprises a frame of substantially the same size as the border 12, said frame also being made of square tubes. At the pressure surfaces between the clampimg device 16 and the border 12 facing and cooperating with each other a friction lining 17 and an elastic pressure lining 18 respectively, or vice vers
REFERENCES:
patent: 1778385 (1930-10-01), Griess
patent: 3391635 (1968-07-01), Mathews
patent: 3608482 (1971-09-01), Buhley
patent: 3608484 (1971-09-01), Buhley
patent: 3608517 (1971-09-01), Shroff
LandOfFree
Device for stretching and fixing a cloth on a frame does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for stretching and fixing a cloth on a frame, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for stretching and fixing a cloth on a frame will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-741810