IMPROVEMENTS IN TENTER HOOKS OR GRIPPERS FOR SELF- ACTING OR OTHER STRETCHING MACHINES FOR TEXTILE FABRICS
Year: 1877

page_text: LETTERS PATENT to Gustave Hertzog, of Reims, France, Mechanician, for the
Invention of "IMPROVEMENTS IN TENTER HOOKS OR GRIPPERS FOR SELF-
ACTING OR OTHER STRETCHING MACHINES FOR TEXTILE FABRICS."
ALL NAAMban 1977 and dated the 9th Tune 19
PROVISIONAL SPECIFICATION left by the said Gustave Hertzog at the
Office of the Commissioners of Patents on the 8th June 1877.
GUSTAVE HERTZOG, of Reims, France, Mechanician. "IMPROVEMENTS IN TENTER
HOOKS OR GRIPPERS FOR-SELF-ACTING OR OTHER STRETCHING MACHINES FOR
TEXTILE FABRICS."
According to one of my present improvements I construct tenter hooks or grippers
for holding fabrics while being stretched as follows:--On the side of a link of the
travelling pitch chain to which the fabric is to be temporarily attached, I fix a
bracket having two projecting arms, on the lower one of which is fixed or formed a
bar on which the fabric is to be pressed, while the upper arm has pivotted to it a
bell-crank lever, one end of which has a bar which bears against the first-named bar,
and constitutes the second gripping surface.
The two gripping surfaces are so formed and arranged relatively to the centre to
which the lever is hinged, that the gripping bar on the latter in moving in the
direction in which the fabric is pulled, exercises a wedging action against
the fixed gripping bar, so that when the fabric has been placed between the gripping
surfaces, any pull upon it produced by the stretching action of the chain will tend to
tighten the whole of the gripping bars upon it.
The releasing of the fabric from between the grippers on the opening of the latter
for inserting the fabric is effected by pushing up the free end of the gripper lever
so as to move its gripping bar away from the fixed bar. This pushing action
may be effected either by hand or by fixed incline, against which the lever iş
made to bear.
A spring may be applied to the lever so as to bring it quickly, in contact with the
fixed gripping bar when the fabric has been inserted.

page_text: According to another arrangement, instead of the lever carrying the second
gripping bar, being pivotted to a fixed centre, it has an inclined shoulder which is
marle tobear against the under side of a stud fixed on the bracket below the gripping
surfaces, such stud constituting the fulcrum of the lever, and the incline of the
shoulder serving to allow for varying thicknesses of fabric between the gripping
surfaces, and to free the fabric from the grip when the lower end of the lever is
pushed so as to cause its incline to move away from the stud. Behind the fixed
gripping bar an incline is formed on the bracket, so that when the lever is pushed
as above described for releasing the fabric, a spring bearing against the back of the
lever operating together with a roller bearing against the lower end of the lever,
causes the latter, together with its gripping bar, to ride up the incline away from the
fixed gripping bar. For bringing the lever into action again, it is pushed
downwards by a fixed roller acting on its upper end, while at the same time
another roller presses the lower end of the lever inwards, so as to move the incline
of the shoulder under the fixed stud.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Gustave Hertzog in the Great Seal Patent Office on the 5th December
1877.
GUSTAVE HERTZOG, of Reims, France, Manufacturer. "IMPROVEMENTS IN TENTER
HOOKS OR GRIPPERS FOR SELF-ACTING OR OTHER STRETCHING MACHINES FOR
TEXTILE FABRICS.”
According to one of my present improvements I construct tenter hooks or grippers
for holding fabrics while being stretched as follows:-On the side of a link of the
travelling pitch chain to which the fabric is to be temporarily attached, I fix a
bracket having two projecting arms, on the lower one of which is fixed or formed a
bar on which the fabric is to be pressed, while the upper arm has pivotted to it a
bell-crank lever, one end of which has a bar which bears against the first-named bar,
and constitutes the second gripping surface.
The two gripping surfaces are so formed and arranged relatively to the centre to
which the lever is hinged, that the gripping bar on the latter in moving in the
direction in which the fabric is pulled exercises a wedging action against the fixed
gripping bar, so that when the fabric has been placed between the gripping surfaces,
any pull upon it produced by the stretching action of the chain will tend to tighten
the hold of the gripping bars upon it.
The releasing of the fabric from between the grippers on the opening of the latter
for inserting the fabric is effected by pushing up the free end of the gripper lever
so as to move its gripping bar away from the fixed bar. This pushing action
may be effected either by hand or by fixed inclines, against which the lever is
made to bear.
A spring may be applied to the lever so as to bring it quickly in contact with
the fixed gripping bar when the fabric has been inserted.

page_text: Drawings, according to which the fabric is gripped between a fixed jaw and a jaw
forming part of a notched moveable piece, having the end of its notch inclined
and bearing against a fixed pin so as to produce a wedging action tightening the
grip.
In witness whereof, I, the said Gustave Hertzog, have hereunto set my hand
and seal, this Twenty-eighth day of November, in the year of our Lord One
thousand eight hundred and seventy-seven.
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GUSTAVE HERTZOG. (Ļ.S.)