A NEW OR IMPROVED LOCK-WASHER, APPLICABLE FOR SECURING NUTS ON BOLTS AND OTHER LIKE PURPOSES."
Year: 1882

page_text: LETTERS PATENT to Thomas Henry Drew, of Walsall, in the County of
Stafford, for an Invention of "A NEW OR IMPROVED LOCK-WASHER,
APPLICABLE FOR SECURING NUTS ON BOLTS AND OTHER LIKE PURPOSES."
PROVISIONAL SPECIFICATION left by the said Thomas Henry Drew at the
Office of the Commissioners of Patents on the 7th January 1882.
THOMAS HENRY DREW of Walsall in the County of Stafford. "A NEW OR
IMPROVED LOCK-WASHER APPLICABLE FOR SECURING NUTS ON BOLTS AND OTHER
LIKE PURPOSES."
This Invention relates to a new or improved lock-washer applicable for securing
nuts on bolts and other like purposes and has for its object to prevent a nut after
it has been screwed up getting unscrewed or becoming loose owing to the jarring or
tremulous motion of the parts which it serves to connect.
Instead of making the
My improved lock-washer is at once simple and effective.
outer rim of the washer plain in the ordinary manner I make thereon suitable
teeth or projections of any convenient shape such as square, half round, pointed or
otherwise.
When the nut is screwed down upon the bolt to its proper tightness one of such
teeth or projections is turned up against one of the sides of the nut thus preventing
the nut from turning except by taking the washer round with it.-In order to
prevent this occurring another of such teeth or projections is turned down into a
small hole made for this purpose either with a drill or punch in the article which
the bolt is intended to fasten.
By this means the nut is effectually locked in position and all risk of its becoming
loose or unscrewed is entirely obviated at the same time that the cost of carrying
my Invention into operation is very trifling.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent and of
an Order of the Lord Chancellor filed by the said Thomas Henry Drew in the
Great Seal Patent Office on the 8th July 1882.
THOMAS HENRY DREW of Walsall in the County of Stafford. "A NEW OR
IMPROVED LOCK-WASHER APPLICABLE FOR SECURING NUTS ON BOLTS AND OTHER
LIKE PURPOSES."
This Invention relates to a new or improved lockwasher which is applicable for
securing nuts on bolts and other like purposes and has for its object to prevent a
nut after it has been screwed up getting unscrewed or becoming loose owing to the
jarring or tremulous motion of the parts which it serves to connect.
My improved lock washer is at once simple and effective. Instead of making the
outer rim of the washer plain in the ordinary manner I make thereon two or
more teeth or projections of any convenient shape such as square, half round,
pointed or otherwise.
When the nut is screwed down upon the bolt to its proper tightness one of such
teeth or projections is turned up against one of the sides of the nut thus preventing
the nut from turning except by taking the washer round with it. In order to
prevent this occurring another of such teeth or projections is turned down into a
small hole made for this purpose either with a drill or punch in the article which
the bolt is intended to fasten.
By this means the nut is effectually locked in position and all risk of its becoming
loose or unscrewed is entirely obviated at the same time that the cost of carrying
my Invention into operation is very trifling.
My improved lock-washer may be made either of iron, steel, brass zinc, copper or
of any other suitable metal and may be either square round triangular, hexagon, or
of any other convenient shape.
In Figure 1 of the accompanying Drawings I have shewn a side view of my
improved lock-washer as it appears when fitted. A is the seating to which the bolt
is secured, B is the bolt-C the nut,-D the lock-washer having one of its teeth or
projections E turned up against the side of the nut and another of such teeth or
projections F turned down into a hole formed in the seating thus effectually securing
the bolt in position. Figure 2 of such Drawings shews a plan view thereof.
Having thus fully described and ascertained the nature of my said Invention
and the manner of carrying the same into effect I would have it understood that
what I claim and desire to secure by the herein before in part recited Letters Patent
is a new or improved lock-washer applicable for securing nuts on bolts and other
like purposes made and fitted in the manner hereinbefore described and illustrated.
In witness whereof I the said Thomas Henry Drew have hereunto set my
hand and seal this Fifth day of July in the year of our Lord One thousand
eight hundred and eighty-two.
THOMAS HENRY DREW. (L.S.)