IMPROVEMENTS IN HOLDFASTS EMPLOYED BY CARPENTERS, JOINERS, WHEEL- WRIGHTS, CABINET MAKERS, AND OTHERS
Year: 1884

page_text: TRUVIDIONAL DIECIFICATION.
I, WILLIAM HAYHURST of No 1 Catlow Street, Burnley in the County of
Lancaster, Cramp Maker do hereby declare the nature of my invention for
"IMPROVEMENTS IN HOLDFASTS EMPLOYED BY CARPENTERS, JOINERS, WHEEL-
WRIGHTS, CABINET MAKERS, AND OTHERS," to be as follows:-
In this class of mechanism a holding down lever is employed for securing and
holding upon the workman's bench the article under operation.
:
Hitherto this lever has been secured in position by a set screw, which acted
against a pillar employed for supporting the mechanism.
·
My Invention consists in securing and holding this lever in position by an
eccentric which is caused to move on its centre by a handle or rod, so that when it
is turned downward, the rear end of the said lever is raised whilst the front or
opposite end thereof is depressed, by which means the article is firmly secured
upon the bench, but when the handle is raised the article is released.
The underside of the eccentric may be smooth or serrated, so as to bito and
prevent slipping.
"
By the employment of the eccentric for purposes mentioned the holding down
lever is fixed and released very much quicker than can be done by a screw.
Dated this 23rd day of February 1884.

page_text: I, WILLIAM HAYHURST of No 1 Catlow Street, Burnley, in the County of
Lancaster, Cramp Maker do hereby declare the nature of my invention for
"IMPROVEMENTS IN HOLDFASTS EMPLOYED BY CARPENTERS, JOINERS, WHEEL-
WRIGHTS, CABINET MAKERS AND OTHERS and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement
"
In this class of mechanism a holding down lever is employed for securing and
holding upon the workman's bench the article under operation.
Hitherto this lever has been secured in position by a set screw, which acted
against a pillar employed for supporting the mechanism.
My improvement is illustrated in the accompanying Sheet of drawings where
A is a bench having a loose piece of wood, B thereon, C is the pillar of an ordinary
cramp or holdfast having a lever D hinged at E, arranged in the usual manner.
On the front end of this lever is hinged a collar F which was formerly forced upon
the article B by means of a set screw and handle operated same as a vice, which screw
passed through the opposite end of the lever D, but by my Invention the said screw
is dispensed with, and a more ready and reliable piece of mechanism substituted
consisting of the handle G, the bottom part of which is centered eccentric to the
end of the lever in such manner that when the handle is in a vertical position as
shewn in Figure that the collar F is clear of the article B, but when the handle
is turned down as shewn in Fig 2 the short end of the lever is raised and the point
end depressed, by which means the collar F is forced upon the article B, and
thereby firmly, held down on the bench.
The article can however be instantly released by lifting the handle into an
upright position.
By the adoption of this eccentric handle the holdfast can be much more readily
employed than is the case with those having a set screw to operate the lever D.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is;
The employment in a holdfast of the eccentric and handle in manner and for
purposes substantially as herein shewn and described.
A