IMPROVEMENTS IN SCREW-BOLTS AND NUTS' as follows:
Year: 1885

page_text: I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co Patent Agents,
Southampton Buildings, in the County of Middlesex do hereby declare the
nature of my invention for "IMPROVEMENTS IN SCREW-BOLTS AND NUTS'
as follows:-
"
to be
This invention relates to a screw bolt adapted for use with a nut having a right
hand screw-thread or with one having a left hand screw-thread, or with both kinds
of nuts at the same time.
The improved screw bolt has-rows of segments of threads at opposite portions or
sides, the faces of the segments being chamfered off at reverse ends of the segments
so that a nut having either a right or a left hand thread may be engaged with the
bolt.
I make the screw bolt by forming an ordinary screw thread, for instance a right
hand screw thread upon it. Then I cut off portions of the screw thread so that the
bolt will be left provided with two longitudinally extending rows of segments of
the thread and will have between these rows of segments, two plain or smooth
longitudinal portions, which will not project from the axis of the bolt farther than
the base of the thread cut upon the bolt. Next I chamfer off the faces of the
segments at the ends.
It will conduce to a clear explanation of this if I assume that the bolt is in
an upright position. Assuming this to be the fact I chamfer off the upper face of
each segment of the thread at the higher end, and the under face at the reverse
end or lower end. This chainfering enables a nut having either a right hand or
a left hand screw thread to operate with the bolt. A bolt which is susceptible of
operation with either kind of nut or both kinds of nuts is desirable for many
purposes notably where jam nuts are serviceable.
HASELTINE, LAKE & Co.,
For the Applicant.

page_text: mprovements
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of my invention for IMPROVEMENTS IN SCREW BOLTS AND. NUTS " and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :—
The object of this invention is to provide bolts and nuts of such character that
the nuts may be turned in reverse directions to screw them on the bolts and
without forming the bolts with reversely threaded portions of different diameters
or with reversed intersecting threads.
My improvement consists in a bolt or nut provided with a single screw thread
having a full projection at opposite portions and a gradually less projection towards
intermediate portions of the bolt or nut; the operative portions of the thread
being of such length circumferentially of the bolt or nut that either a nut or bolt
having a right hand or a left hand thread may be used in conjunction therewith.
It will be advantageous to chamfer off the extremities of the operative portions of
the thread of my bolt or nut so as to there enlarge the space between the operative
portions of the screw thread.
In the accompanying drawing Figure 1 is a side view of a bolt embodying my
improvement and a transverse section of two nuts fitted thereto. Figure 2 is a
side view both of the bolt and nuts, the screw threads of the nuts being shown by
dotted lines. Figure 3 is a transverse section of the screw threaded end of the
bolt and an end view of a nut delineated by dotted lines. Figure 4 is a side view
of another bolt embodying my improvement and a transverse section of two nuts
fitted thereto. Figure 5 is a side view of the bolt and the nuts which are shown
in Figure 4, the screw threads of the nuts being delineated by dotted lines.
Figure 6 is a transverse section of the screw threaded end of the bolt shown in
Figures 4 and 5 and a similar view of a nut applied thereto, the latter being
shown by dotted lines. Similar letters of reference designate corresponding parts
in all the figures.
I will first describe my improvement as it is illustrated in Figures 1, 2 and 3.
A designates the bolt and B C designate the nuts which are used therewith.
The bolt A has a single screw thread which extends in the same direction
around the body of the bolt. At opposite portions or sides a of the bolt this screw
thread is of full projection but it is of gradually less projection from these portions
As here shown it decreases in
towards the intermediate portions of the bolt.
projection towards the portions intermediate of the portions a so that plain spaces
are left on the body of the bolt.
b
The operative portions of the screw-thread are made of such length circumfer⚫
entially of the bolt that the nut B having a right hand screw thread and also
the nut C provided with a left hand screw thread can be engaged therewith.
Turning now to a consideration of my improvement as illustrated by Figures 4, 5
and 6 it will be seen that the screw thread does not entirely disappear at the

page_text: portions of the bolt intermediate of the portions a where it is of full projection.
It will also be observed that the sides of the screw thread are chamfered off at
certain parts c. These chamfered parts are at about the ends of the operative
portions of the thread and they there widen the space between the adjacent con-
volutions of the thread so as to facilitate the operation of the screw threads BƠ
with the screw thread of the bolt.
The screw threads of the nuts BC may be the ordinary kind. I may provide
the nuts or a nut with the peculiar thread which I have described in conjunction
with my bolt and then use with such nut a bolt having an ordinary right or left
hand screw thread.
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 whiat
I claim is
First. A bolt or nut provided with a single screw thread having a full pro-
jection at opposite portions and a gradually less projection towards intermediate
portions of the bolt or nut; the operative portions of the thread being of such
length circumferentially of the bolt or nut that either a nut or bolt having a right
hand or a left hand screw thread may be used in conjunction therewith,
substantially as specified.
2. A bolt or nut provided with a single screw thread having a full projection
at opposite portions and a gradually less projection towards intermediate portions
of the bolt or nut; the operative portions of the thread being of such length
circumferentially of the bolt or nut that a nut or bolt having a right hand or a
left hand screw thread may be used in conjunction therewith and said operative
portions being chamfered off at the ends to there enlarge the space between
adjacent convolutions of the screw thread, substantially as specified.
Dated thin 6th Jantahan 1005
HASELTINE, LAKE & Co.,
For the Applicant.