Improvements in Ratchet Braces.
Year: 1893

page_text: Date of Application, 20th Oct., 1893-Accepted, 25th Nov., 1893
COMPLETE SPECIFICATION.
Improvements in Ratchet Braces.
I, AUGUST BODENSTEDT Junior of Kaiserstrasse Bremen, Germany, Manu-
facturer, 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 consists in a new construction of ratchet brace in which the spring
and pawl are contained within the stem of the working handle and the ratchet wheel
made with saw like teeth is contained within the boss of the handle. The outward
appearance of the ratchet brace is much the same as the ordinary ones and is
represented in Figure 1, while Figure 2 is a part sectional view shewing the interior
construction.
The brace handle is made in parts, that is to say, it is near the centre boss a made
in socket form & with inner screw thread for the screwed end of the outer part k
to screw into. The centre boss a of the brace handle is in the form of a ring or
eye. The head c which receives the drill or boring tool and forms the body of the
apparatus is or may be provided with inner lining, e e being screws acting on the
latter or direct on the drill for fixing the latter. The other end of the body c
terminates in a screw socket finto which the centre g is screwed and which serves
to press the drill against the piece to be drilled or bored while abutting against the
head of the drill-post or other fixed part. The part c is within the boes a formed
with saw-like teeth n o. The ring d is screwed on to the body part and thus holds
the parts together. The pawl which acts against the teeth no is in the form of a
bolt provided with helical spring m acting against a shoulder on the bolt and
against the screwed end h of the handle k in such a manner that the inner end of
the bolt I rests normally on the flat part u of one of the teeth n o. The spring m
admits of the bolt / moving to a certain extent lengthways, so that when the centre
or wheel part is turned, the bolt is raised by one of the teeth n o, and when the
bolt has passed the tooth it will spring forward again and take its place behind the
part o of the next tooth. The centre part will thus be free to take a motion from
the right to the left while its turning in the opposite direction is prevented by the
pawl bolt catching behind the part o of the tooth. But the power applied to the
handle k causes the whole tool and the drill therewith when thus locked by the bolt
to be turned and the drill to act. The pressure is by the part o transmitted to the
bolt which is only exposed to shearing strain as it fits well in its guide socket b.
By unscrewing the handle k the spring pawl can easily be removed and kept by
itself or if defective be replaced by one kept in reserve. The bolt being only
exposed to shearing action the durability and strength of the ratchet brace are
increased.
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 :-
:-
A ratchet brace having a pawl bolt provided with helical spring m which is
arranged in a socket part of the handle and abuts against the inner screwed end h
of a detachable part of the handle, the pawl bolt l'acting with saw-like teeth n o
on the body of the brace substantially as described and shewn.
Dated this 20th day of October 1802
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.