Improved Means of Securing the Cotter of a Slot Bolt.
Year: 1893

page_text: Date of Application, 17th Jan., 1893
Complete Specification Left, 19th July, 1893--Accepted, 26th Aug., 1893
PROVISIONAL SPECIFICATION.
Improved Means of Securing the Cotter of a Slot Bolt.
1 CHARLES MUSGROVE STETSON. Dentist, of 647 Calle Cordoba Rosario
Santa Fe. Argentine Republic, do hereby declare the nature of this invention to
he as follows:-
-
This invention relates to improved means of securing the cotter of a slot bolt and
consists in making the washer concavo-convex and providing the cotter with ratchet
teeth adapted to engage with the edge of the washer whereby the withdrawal of the
cotter is prevented as hereinafter described.
The bolt has a diametrical slot of which the outer end is beveled to correspond to
the taper of the back edge of the cotter which is wedge shaped in the direction of
its length, so that when the cotter is driven through the slot its front edge moves
toward the head of the bolt. The shank of the bolt can have the usual square
shoulder, if desired, to prevent it from turning; or, the bolt can be ride to fit the
bolt holes whether round, square, oval, etc.
The front edge of the cotter has teeth adapted to engage the inner edge of a
concavo-rouvex washer slipped on the bolt in front of the cotter. The washer is
preferably made tapering in cross section or of diminished thickness towards the
inner edge, so that when the parts are in place, the bolt can be secured in position
by merely driving the cotter through the slot, the cotter in travelling forward in
consequence of its wedge shape pressing against the washer, thus tightening the
bolt at the same time that the teeth slide over the inner edge of the washer and
finally engage therewith when the cotter has been driven home so that the cotter is
locked in position by its teeth engaging the inner edge of the washer.
if desired the washer may be applied in the reverse way so that the outer edge
projects towards and is engaged by the teeth while the inner edge bears against the
article to be fastened.
Dated this 17th day of Lano 1202
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.
COMPLETE SPECIFICATION.
Improved Means of Securing the Cotter of a Slot Bolt.
1, CHARLES MUSGROVE STETSON, Dentist, of 647 Calle Cordoba Rosario
de Santa Fé, Argentine Republic, 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:
This invention relates to improved means of securing the cotter of a slot bolt and
consists in making the washer concavo-convex and providing the cotter with ratchet
teeth adapted to engage with the edge of the washer whereby the withdrawal of
the cotter is prevented, as hereinafter described and claimed.
Reference is to be had to the accompanying drawings, forming part of this
Specification, in which
Figure 1 is a perspective view of a bolt, with the improved means of securing the
Cotter, while
Figure 2 shews a transverse section of a railway fish joint, with the improvement
applied thereto.

page_text: The bolt A has a diametrical slot C of which the outer end C' is bevelled, as
shewn in Figure 2, to correspond to the taper of the back edge D' of the cotter D
which is wedge shaped in the direction of its length, so that when the cotter is
driven through the slot its front edge moves toward the head B of the bolt. The
shank of the bolt can have the usual square shoulder, if desired, to prevent it from
turning, or the bolt can he made to fit the bolt holes whether round, square, oval,
etc. On the fr. nt edge of the cotter D are formed teeth E adapted to engage the
inner edge of a concavo-convex washer F slipped on the bolt. A in front of the
otter D. The washer F is preferably made tapering in cross-section or of
diminished thickness towards the inner edge, as shown in Figure 2, so that when
the parts are in place the bolt A can be secured in position by merely driving the
cotter D through the slot, the cotter in travelling forward, in consequence of its
wedge shape, pressing against the washer F thus tightening the bolt, at the same
time that the teeth E slide over the inner edge of the washer and finally engage
therewith when the cotter D has been driven home, so that the cotter D is locked
in position by its teeth E engaging the inner edge of the washer F. If desired, the
washer F may be applied in the reverse way so that the outer edge projects towards
and is engaged by the teeth E while the inner edge bears against the article to be
fastened.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. The combination, with a longitudinally-slotted bolt and a concavo-convex
washer thereon, of a cotter having one side edge provided with ratchet teeth
adapted to engage with the edge of the washer and to be thereby retained,
substantially as shewn and described.
2. The combination, with a slot bolt whose slot has an inclined end, of a concavo-
convex washer on the said bolt and a toothed wedge shaped cotter adapted to pass
through the slot and to engage with its teeth the raised edge of the said washer
whereby it is secured, substantially as shewn and described.
Dated this LYLN day of JDY 1893
Dated LHIS TYLN day Of JIHV 1895
C. M. STETSON,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.