Improvements in Locking Nuts of Bolts.
Year: 1889

page_text: Date of Application, 23rd Aug., 1889
Complete Specification Left, 19th May, 1890-Accepted, 28th June, 1890
"
PROVISIONAL SPECIFICATION.
Improvements in Locking Nuts of Bolts.
I THOMAS HENRY RAMSDEN of Bramhope near Leeds in the County of York Land
Agent do hereby declare the nature of this invention to be as follows:-
Two nuts are employed, one a right hand nut, the other a left hand nut. A circular
groove is cut in the face and round the center of one nut, and a circular ridge or
projection is formed on the meeting face and round the center of the other nut. The
circular projection of the one is formed to wedge in the circular groove of the other
nut. Segments of the circular projection may be used instead of the whole circle.
If a bolt having a right hand thread for the right hand nut, and also a crossing left
hand thread for the left hand nut, have the said nuts screwed thereon, the ridge on
the one will tighten in the groove in the other and the two nuts will be locked on
the bolt.
Or a circular groove may be cut in both the meeting faces of a right hand nut, and
a left hand nut; and a key ring or hoop may be placed between the nuts. The said
key ring is formed to wedge tightly in both the grooves when the said nuts are
screwed together on a bolt having a right hand thread, and a crossing left hand thread.
In both the described devices the pitch of the right hand thread, and of the left
hand thread may be the same; or the pitch of the right hand thread may be different
from the pitch of the left hand thread.
Dated this 22nd day of August 1889.
THOMAS HENRY RAMSDEN.
COMPLETE SPECIFICATION.
Improvements in Locking Nuts of Bolts.
I THOMAS HENRY RAMSDEN of Bramhope near Leeds in the County of York Land
Agent do hereby declare the nature of this invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :-
Two nuts are employed one a right hand nut, the other a left hand nut. A circular
groove is cut in the face and round the center of one nut, and a circular ridge or
projection is formed on the meeting face and round the center of the other nut. The
circular projection of the one is formed to wedge in the circular groove of the other
nut. Segments of the circular projection may be used instead of the whole circle.
If a bolt having a right hand thread for the right band nut, and also a crossing left
hand thread for the left hand nut have the said nuts screwed thereon, the ridge on the
one will tighten in the groove in the other and the two nuts will be locked on
the bolt.
Or a circular groove may be cut in both the meeting faces of a right hand nut, and
a left hand nut; and a key ring or hoop may be placed between the nuts. The said
key ring is formed to wedge tightly in both the grooves when the said nuts are
screwed together on a bolt having a right hand thread, and a crossing left hand
thread.
In both the described devices the pitch of the right hand thread, and of the left
hand thread may be the same; or the pitch of the right hand thread may be different
from the pitch of the left hand thread.

page_text: In the accompanying drawing a shews a screwed end of a bolt, b and c shew
sections through the centers of a pair of nuts, and fand shew like sections through
another pair of nuts and d shews a key ring or washer key for the nuts b and c.
groove
In the drawing a circular groove 6 is in the face of the nut b, and a like circular
c' is in the face of the nut c; the retaining nut 6 being in this instance a right
hand nut, and the lock nut ca left hand nut. The grooves b¹ and e¹ of the nuts b
and c are formed in their meeting faces circularly, that is they are formed on the
lines of circles having their centers in the axis of the nuts b and c when the nuts b
and c are screwed upon the bolt a. The bolt a has crossing right and left hand
threads to correspond with the threads of the nuts b and c. When the nuts b and c
are screwed upon the bolt a the washer key d wedges in the grooves b¹ and c¹ and
grips the nuts b and c together and the lock nut e having a thread of the opposite
hand to the retaining nut 6 the latter is locked upon the bolt a.
C
Moreover for a pair of nuts one may have a circular groove formed in a face round
the center, that is, formed circularly in the said manner described: and the other nut
may have a circular projection on the meeting face and round the center of the nut :
that is the said projection is formed on a face of the nut on the line of a circle having
its center in the axis of the nut to mate with the said groove. In the drawing the
right hand nut f has the groove f¹ in a face in the said manner and the left hand
nut g.has the projection g¹ formed on a face on the line of a circle having its center
in the axis of the nut g. When the nuts ƒ and g are screwed upon the bolt a the
projection 9 of the nut g wedges in the groove f' of the nut f and the nuts fand g
are locked together. The nuts ƒ and g having threads of opposite hands the retaining
nut cannot slack being counteracted by the opposing lock nut g.
Also a segment or segments of the said projection g¹ of the nut g may serve in the
said manner to wedge in the groove f¹ of the aut f.
The pitch of the threads for the nuts and bolts may be the same for both right and
left hand as in the drawing; or the pitch of the right hand thread may be different
from that of the left hand thread. I do not claim as new the use for lock nuts of
right and left hand threads and for distinction I have named the herein described
lock nut the Leeds Lock Nut.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A groove in a face of a right hand nut on the line of a circle having its
center in the axis of the nut and a like groove in a face in like manner of a
left hand nut; substantially as and for the purposes described.
2. A circular washer key in combination with the described grooved right hand
nut and with the described grooved left hand nut; substantially as and for the
purposes described.
3. The combination of a bolt having crossing right and left hand threads, of the
right hand nut grooved as described, of the left hand nut grooved as described,
and of a washer key; substantially as and for the purposes described.
4. A projection, or a segment, or segments of the same on a face of a nut and
on the line of a circle having its center in the axis of the nut; and a groove in
a face of a companion nut on the line of a circle having its center in the axis
of the nut; substantially as and for the purposes described.
5. A projection as described or a segment or segments of the same on a face of a
nut tapped one hand, and a groove as described in a face of a companion nut tapped
the other hand, and a bolt screwed with crossing right and left hand threads corre-
sponding respectively to the said right and left hand nuts; substantially as and for
the purposes described.
6. A bolt screwed with crossing right and left hand threads as required for a pair

page_text: of nuts one nut tapped right hand the other nut tapped left hand for locking together
on their contact faces by a projection on the face of one nut or a segment or segments
of the same wedging in a groove in the face of the other nut, the said projection and
the said groove being circular that is on the line of a circle having its center in the
axis of the nut; substantially as and for the purposes described.
Dated this 17th day of May 1890.
THOMAS HENRY RAMSDEN.