IMPROVEMENTS IN LOCK NUTS, AND IN MEANS AND APPLIANCES FOR LOCKING OR TIGHTENING THE NUTS OF BOLTS AND THREADED SHAFTS
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by John Bowns at the Office of the
Commissioners of Patents on the 12th October 1877.
JOHN BOWNS, of Sheffield, in the West Riding of the County of York, Engineer.
"IMPROVEMENTS IN LOCK NUTS, AND IN MEANS AND APPLIANCES FOR LOCKING OR
TIGHTENING THE NUTS OF BOLTS AND THREADED SHAFTS."
These improvements relate to lock nuts, and to means and appliances for locking
or tightening the "nuts" of bolts and threaded shafts, and consist in forming the
"nut" to be locked with one or both ends of a projecting slotted cone, or with one
slot through the "nut" in the direction of its length, or with slots in the cones
and one slot through the "nut" in the direction of length, and consist in forming
the lock nut or appliance for locking with an internal cone, which, when acting on
the conical slotted end of the "nut," will cause the said
"nut "
to be locked or
tightened on to the bolt or threaded shaft.
In carrying into effect this Invention, the surface of the substance through which
the bolt protrudes may be countersunk, and a slotted "nut" employed which has
double-coned ends, and when this "nut" is screwed on to the bolt which protrudes
through the countersunk face, one cone of the "nut" will enter the countersunk
hole, and thereby be tightened on to the bolt; the lock or check nut having one
internal cone may then be screwed up to the other end of the coned and slotted "nut,"
so that the internal cone of the lock nut will, on being brought in contact with the
"nut," further tighten or lock it on to the bolt.
This Invention may further be carried into effect by screwing on to the bolt a
slotted "nut" with one coned end, so that this coned end shall enter the counter-
sunk hole in the material through which the bolt protrudes; this said "nut" may
have its other end plain, and into contact therewith may be screwed a coned and
slotted "nut" set the reverse way, so that an internally coned lock nut may be
brought into contact therewith, and tighten it on the bolt, as above specified.
This Invention may further be carried into effect by employing two single-coned
and slotted "nuts" set with their coned ends facing each other, and between such
coned ends a washer would be placed, which said washer would have an internal
cone at each end, which, as the "nuts" and washer are brought into contact would
tighten or lock the "nuts" on to the bolt.
This Invention may further be carried into effect by first screwing an internal

page_text: coned lock nut on to the bolt in contact with the surface of the material through
which the bolt protrudes, so that the external coned end of a slotted "nut" can
enter therein, and be tightened on to the bolt thereby, and the said slotted "nut" may
have its other end coned, and a similar lock nut be used to further tighten it on to
the bolt, or between the two lock nuts aforesaid two single-coned slotted "nuts"
may be employed instead of one double-coned slotted "nut."
"
This Invention may further be carried into effect by employing a slotted "nut
with a coned end tightened or locked on to the bolt by an internal coned collar or
washer, which would be brought firmly into contact with the "nut" by means of a
cotter driven into a suitable cotter hole in the bolt, and acting on the back of the
collar or washer aforesaid.
"
"
If found practicable and desirable a slotted nut' can be used, which has one
end only coned, and a check nut used therewith, which has one end only internally
coned.