Improvements in Ratchet Clutches.
Year: 1889

page_text: Date of Application, 5th Apr., 1889
Complete Specification Left, 6th Jan., 1890-Accepted, 8th Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in Ratchet Clutches.
I HENRY JAMES HOGG KING of Newmarket near Stroud Gloucestershire, Engineer
do hereby declare the nature of this invention to be as follows:-
This Invention relates to Improvements in Ratchet Clutches for which letters
patent were granted to the present applicant A.D. 1884 No. 2645.
One of the Improvements in the present Invention consists in fitting the large
pawls of the clutch in such a manner, that under no circumstance can they go into
gear without being pushed in, by the small pawl or pawls; for if such should occur
there is a liability of the clutch being broken. To effect this object I introduce
sufficient friction by means of springs or otherwise to always insure that the pawls
shall not fall into gear before the proper time, the same arrangement also holds the
pawls in position in a better way than has been done previously.
A 2nd Improvement consists in arrangements for locking the pawl portion of the
clutch out of gear, so that it can not engage the ratchet portion of the clutch
should it be requisite to run the pawl portion and not the ratchet part of the
clutch.
This I effect in two ways. In one the pawls can be locked out of gear during the
time the clutch is standing still. The first of these arrangements consists of a slide
on the boss portion of the clutch which is usually moved with a lever, and which locks.
out the pawls so that they can not engage the ratchet teeth.
The second arrangement consists in simply putting on a loose bar of iron, when the
clutch is stopped and which locks the pawls out of gear.
A further Improvement consists in the friction ring or clip which I now make with
a flat ring so that the friction surface is greatly increased by which means all wear
is practically avoided. This clip is also so shaped that it now locks the throwing in
pawl out of gear so that it has now no tendency to wear itself out, as was previously
the case if the friction ring was not properly attended to..
Dated this 4th day of April 1889
COMPLETE SPECIFICATION.
Improvements in Ratchet Clutches.
I HENRY JAMES HOGG KING of Newmarket near Stroud Gloucestershire Engineer
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 Improvements in Ratchet Clutches for which letters
patent were granted to the present applicant A.D). 1884 No. 2645, and in order that
my said Invention and the manner of performing the same may be properly under-
stood I hereunto append a Sheet of Explanatory Drawings. In these drawings the
same reference numerals are used to mark the saine or like parts wherever they are
repeated as in Specification No. 2645³¹.
One of the Improvements in the present Invention, consists in fitting the large
pawls of the clutch 1 & 2 in such a manner that under no circumstances can they go
into gear till they are pushed in by the small pawl or pawls 11 or 12 for if such
should occur, there is a liability of the clutch being broken.
I prefer to effect this object by means of the eye bolt 24 which slip over the
pins 4 & 5, and by means of the spring washers under the nuts 25 draw the large

page_text: pawls up to their seats, and at the same time keep them in position and produces
sufficient friction to insure that they shall not fall into gear, till they are pushed in by
the small pawl.
It should be noted that a slot is cut in the large pawl to admit the eye bolt 24..
A 2nd Improvement consists in arrangements for locking the pawl portion of the
clutch out of gear so that it can not engage the ratchet portion should it be requisite
to run the pawl portion and not the ratchet part of the clutch.
This I effect in 2 ways. In one the pawls can be locked out of gear when the
clutch is working and the other when the clutch is standing only.
The first of these arrangements consists of a slide on the boss portion of the clutch
which is usually moved with a lever, and which by means of pins, locks out the pawls,
so that they can not engage the ratchet teeth.
The 2nd arrangement consists in putting on the loose bar of iron 26, by means of
the set pin 27, which pin screws into the large pawl and keeps it against the outside
wall, of the clutch & clear of the ratchet teeth, and the pin 28 on the small pawl,
is held by the same bar, and keeps the small pawl out of gear.
A further Improvement consists in the friction ring 17 which is now made with a
raised edge marked A. B. C D E F. Fig. 1. and which holds the small pawl out of
gear by means of the pin 28 at the point between D & E. and also prevents it
wearing itself out when going into gear; the back portion of the cam from A to B.
also insures that the small pawl shall go into gear at the proper time, without failure,
should the ordinary spring for this purpose fail to act.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is
1st. The use in a Ratchet Clutch of an arrangement for holding the main pawl or
pawls in position with sufficient friction, so that they are not liable to fall into gear
before they are pushed into action by the small pawl or pawls.
2nd. The locking out arrangements described, so that the pawl portion of the clutch
can be run when the ratchet part is standing.
3rd. The Improved friction ring & small pawl as described-which insures the
minimum of wear with the greatest certainty of action.
Dated this 3rd day of January 1890.
H. J. H. KING.