Improvements relating to Locking Devices for Borew , AN MUD.
Year: 1886

page_text: Improvements relating to Locking Devices for Borew
,
AN MUD.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings, London, 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 :-
•
The object of my invention is to so arrange a system of nuts on screws or bolts,
that when said nuts have been adjusted on the screws they cannot be displaced
spontaneously by jarring or other motion.
Figure 1 is a longitudinal section of a bolt shewing my improvements.
Figure 2 is a like view of the right and left hand threaded nuts removed from
the bolt.
Figure 3 is a modification of Fig. 1.
Figure 4 is an end view of the same.
Figure 5 is another modification of Fig. 1, and,
Figure 6 is an end view of the same.
The invention consists in the application to one screw of a right handed nut and
a left-handed nut, working on separate corresponding threads, or of one nut and
one screw working in opposite directions; and of set-screws for locking the nuts
together, when they are adjusted. When two nuts, or a nut and screw, working in
opposite directions, are so connected that they cannot be separately turned, it is
evident that they cannot be moved in either direction, and that they are therefore
firmly locked to the screw.
In order to mount two nuts A and B, which have their threads cut in different
directions, as shown in Fig. 2, upon one single bolt C, and close together, the bolt
must have corresponding threads cut on it. This can be done, as in Fig. 1, by
having a right handed thread a cut on one part of the bolt, to receive the nut A,
and a left hand thread b on the other part to receive the nut B. To allow the
nut A to pass over the part b, the thread a must continue through that portion
where the thread b is cut; and, therefore, a double thread a, b is cut on the bolt,
the lines crossing each other, as in Fig. 1.

page_text: When the nut A has been screwed to the requisite place, the nut B is applied,
and screwed close against A, as shown.
Set screws c'c, arranged in the edges of one or both of the nuts A, B, are now
turned down so that their threads lap over the edges of both nuts at once, as shown
in Fig. 1:
The nuts, being prismatic, cannot be turned separately, as the heads of screws c
lock them together, and they cannot be turned jointly, as their threads are cut in
opposite directions. When the threads a, b are not to be crossed, as in Fig. 1, the
outer thread b may be cut on a smaller portion C¹ of the bolt C, as in Fig. 3, to
receive a nut B, with a smaller bore than the nut A, which is screwed upon the
larger part a¹ of the bolt.
The size of the two nuts should, however, correspond, as in Fig. 2, so that they
may be locked by the screws c, c, as in Fig. 1. The threads a, b are, in the latter
case, also in opposite directions, as shown.
Substantially the same invention may be applied by using the nut A and a
screw B³ on a bolt C, as in Figs. 5 and 6. The nut A has its thread so arranged in
conjunction with the thread a on bolt C, that it is turned in the opposite direction
to that in which the screw B2 is turned when applied.
The screw B is fitted into a female thread b, provided in the end of the bolt C,
as shown. The head d of the screw B2 should be of sufficient size to bind upon the
nut A;
and when the screw B is thus made, and its head screwed down upon the
nut A, the latter will be firmly locked, and any motion of the nut A to unscrew
will have a tendency to cause the screw B2 to tighten upon the nut A.
As an additional safe guard, the set screw c may also be employed upon the
head d of screw B³, as shown.
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
1. A-bolt C with two threads a, and b crossing each other, as shown in Fig. 1,
to allow a right hand nut to pass over a thread adapted to a left hand nut and vice
versa, as specified.
2. The combination of the screws c with the nuts A, B, and screw-bolt C,
substantially as described, for the purpose specified.
3. The combination with a screw-bolt C and nut A, of a locking screw B' having
a head d, and operating substantially as described.
TAAA : บะ
1000
HASELTINE, LAKE & Co.,
For the Applicant.