US3580050A — Testing device for stretchable sheet materials un…

Claim 1

Independent Claim 133 words

In a device for testing characteristics such as stretch, bagging and the bursting strength of sheet material, the combination of a chamber having an opening of predetermined shape, means for securing a sample of sheet material to be tested to said chamber in such manner as to extend across and form a substantially fluidtight closure of said opening, means for supplying a fluid under pressure to said chamber to inflate said sample thereby applying to said sample forces tending to stretch said sample in all directions, and means for displaying in intelligible form the manner in which said sample responds to the forces thus applied said last-named means comprising means for displaying in linear measure the amount by which said sample elongates in at least one direction along the surface of the sample.

Claim 2

Dependent Claim 133 words

In a device for testing characteristics such as stretch, bagging and the bursting strength of sheet material, the combination of a chamber having an opening of predetermined shape, means for securing a sample of sheet material to be tested to said chamber in such manner as to extend across and form a substantially fluidtight closure of said opening, means for supplying a fluid under pressure to said chamber to inflate said sample thereby applying to said sample forces tending to stretch said sample in all directions, and means for displaying in intelligible form the manner in which said sample responds to the forces thus applied said last-named means comprising means for displaying in linear measure the amount by which said sample elongates in at least one direction along the surface of the sample.

Claim 3

Dependent Claim 55 words

A device in accordance with claim 1 in which said means for displaying the manner in which said sample responds includes means for displaying the changes in volume of said fluid under pressure incident to said inflation of said sample, and means for displaying the changes in pressure upon said fluid incident to said inflation.

Claim 4

Dependent Claim 17 words

A device in accordance with claim 2 in which said fluid under pressure is a gaseous fluid.

Claim 5

Dependent Claim 43 words

A device in accordance with claim 2 in which said means for displaying the manner in which said sample responds further includes means for displaying the amounts by which said sample elongates in at least two directions which intersect substantially at right angles.

Claim 6

Dependent Claim 119 words

A device in accordance with claim 2 in which said means for displaying the manner in which said sample responds comprising a substantially planar platen, means for mounting a chart on said platen, means actuated in predetermined relation with said changes in pressure upon said fluid for moving said platen with said chart in the plane of said platen, a marking device, means for mounting said marking device in constant contact with said chart upon said platen, and means actuated in predetermined relation with said changes in volume of said fluid under pressure for moving said marking device in the plane of said platen to form a permanent record upon said chart of said changes in pressure and volume.

Claim 7

Dependent Claim 42 words

A devIce in accordance with claim 1 in which said means for displaying the manner in which said sample responds includes means for displaying the amounts by which said sample elongates in at least two directions which intersect substantially at right angles.

Claim 8

Dependent Claim 83 words

A device in accordance with claim 1 in which said means for displaying the manner in which said sample responds comprises a platen, means for mounting a chart on said platen, a marking device, means for mounting said marking device in constant contact with said chart upon said platen, and means actuated in predetermined relation with the response of said sample for causing relative movement between said platen and said marking device to form a permanent record of said response upon said chart.

Claim 9

Dependent Claim 156 words

In a device for testing characteristics such as stretch, bagging and the bursting strength of sheets materials, the combination of a diaphragm made of elastomeric sheet material of known characteristics, means for securing a sample of sheet material to be tested in face-to-face relation with one surface of said diaphragm, said securing means comprising clamping devices for immobilizing closed peripheral areas surrounding superimposed areas of said sample and of said diaphragm, means for supplying a fluid under pressure to the surrounded area of the opposite surface of said diaphragm to cause said diaphragm to inflate thereby applying to said sample forces tending to stretch said sample in all directions, and means for displaying in intelligible form the manner in which said sample responds to the forces thus applied, said last-named means comprising means for displaying in linear measure the amount by which said sample elongates in at least one direction along the surface of the sample.

Claim 10

Dependent Claim 156 words

In a device for testing characteristics such as stretch, bagging and the bursting strength of sheets materials, the combination of a diaphragm made of elastomeric sheet material of known characteristics, means for securing a sample of sheet material to be tested in face-to-face relation with one surface of said diaphragm, said securing means comprising clamping devices for immobilizing closed peripheral areas surrounding superimposed areas of said sample and of said diaphragm, means for supplying a fluid under pressure to the surrounded area of the opposite surface of said diaphragm to cause said diaphragm to inflate thereby applying to said sample forces tending to stretch said sample in all directions, and means for displaying in intelligible form the manner in which said sample responds to the forces thus applied, said last-named means comprising means for displaying in linear measure the amount by which said sample elongates in at least one direction along the surface of the sample.

Claim 11

Dependent Claim 163 words

A device in accordance with claim 8 in which said means for displaying the manner in which said sample responds includes a wire having one end fixed with relation to a point within the immobilized peripheral areas of said diaphragm and said sample, said wire extending from said point in a line across the surrounded area of said sample, guide means with respect to which said wire is free to move lengthwise only, said guide means being fixed with relation to another point within the immobilized peripheral areas of said diaphragm and said sample whereby upon inflation of said diaphragm and consequent stretching of said sample said wire will be displaced with said sample and will be drawn through said guide means, and means connected with said wire to be moved thereby a distance related to the length of wire thus drawn through said guide means whereby to display the elongation of said sample along the line in which said wire extends thereacross.

Claim 12

Dependent Claim 49 words

A device in accordance with claim 9 in which said closed peripheral areas immobilized by said clamping devices are substantially annular, wherein said superimposed areas surrounded by said peripheral areas are substantially circular, and wherein said wire extends substantially diametrically across said superimposed ares surrounded by said peripheral areas.

Claim 13

Dependent Claim 86 words

A device in accordance with claim 8 in which said means for supplying a fluid under pressure includes a chamber containing a gaseous fluid and a hydraulic liquid and closed at the top by said diaphragm and said clamping devices, a reservoir containing a supply of hydraulic liquid, and a pump and suitable piping connecting said reservoir with said chamber, said pump being effective to force hydraulic liquid from said reservoir into said chamber to compress said gaseous fluid against said other surface of said diaphragm.

Claim 14

Dependent Claim 111 words

A device in accordance with claim 11 in which there is also provided a metering valve and suitable piping connecting said reservoir with said chamber, and a two-way valve effective in one position to permit flow of hydraulic fluid only through said pump and effective in another position to cut off said pump and permit flow of hydraulic liquid only from said chamber to said reservoir through said metering Valve, whereby the response of a stretched sample to the gradual reduction of the forces applied for stretching may be displayed by the same means which serve to display the manner in which said sample responds to the application of said forces.

Claim 15

Dependent Claim 34 words

A device in accordance with claim 8 in which said closed peripheral areas immobilized by said clamping devices are substantially annular and wherein said superimposed areas surrounded by said peripheral areas are substantially circular.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-05-24	1974-11-23	1975-05-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-05-24	1978-11-23	1979-05-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-05-24	1982-11-23	1983-05-25	$7700.00	Window Closed / Lapsed

Testing device for stretchable sheet materials under simultaneous distortion in three dimensions

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