Improvements in Midwifery Forceps.
Year: 1893

page_text: Date of Application, 6th Jan., 1893
Complete Specification Left, 18th Sept., 1893-Accepted, 21st Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Midwifery Forceps.
I, DONALD MACDONALD, of 173 Gt. Hampton Row, Birmingham, in the
County of Warwick, Surgeon's Assistant, do hereby declare the nature of this
invention to be as follows:-
I
This invention relates to the particular construction of the midwifery forceps, a
joint being provided preferably in that blade which in use is the upper blade;
prefer to form the joint in the following manner,
-
The handle portion of the blade may be provided with jaws into which an
extension upon the blade fits and through these pass two pins both of which can
be removed when required thus completely detaching the blade, or they may be
connected by a chain or other equivalent device. To use this as a joint, one of
the pins can be withdrawn and the blade can then be turned, as upon a pivot, upon
the remaining pin. To fix it the other pin is inserted and blade and handle are
then rigidly connected.
The pins may be provided with any convenient form of head or equivalent.
means by which they can be operated or they can be arranged as spring detents
capable of automatically locking and only having to be with Irawn when required.
At the ends of the handles I prefer to employ a convenient form of hook preferably
with two or more engaging portions so that the handles may be fixed or locked at
a suitable distance apart. For this purpose pins or projections may be provided
upon the handles with which the hooks engage.
Dated this 6th day of January 1893.
W. P. THOMPSON & BOULT,
Of London, Liverpool, Manchester, and Nottingham,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Midwifery Forceps.
I, DONALD MACDONALD, of 173 Great Hampton Row, Birmingham in the
County of Warwick, Surgeon's Assistant, 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 the particular construction of the midwifery forceps, a
joint being provided preferably in that blade which in use is the upper blade.
The invention will be best understood by reference to the accompanying
drawings in which
Figure 1 is a view of the forceps with the two parts of the upper blade secured
together, and the handles or two blades locked by the detent; in this view a
portion of the handle of one of the blades is shown partly broken away in order
more clearly to illustrate the preferred arrangement of the detent.
Figure 2 is a view of the upper blade showing the blade portion deflected from
the position relatively to its handle in which it is shown in Figure 1.
Figure 3 is a detail view of the detent.
Like letters indicate like parts throughout the drawings.
The handle portion A of the blade A may be provided with jaws a a' between
which an extension a2 upon the blade A¹ fits and through these pass two pins B
and C both of which can be removed when required thus completely detaching the
blade, or they may be connected together by a chain or other equivalent device D.
DO.77

page_text: The pin B which constitutes the pivot by which A¹ is jointed to A is preferably
screwed into the jaw a' and passes freely through the jaw a and extension a²: To
use this as a joint the pin C can be withdrawn and the blade A' can then be
turned, as upon a pivot, upon the remaining pin B, as indicated in Figure 2. To
fix it the pin C is inserted and blade A' and handle A are then rigidly connected.
To prevent the blade A' when being moved in relation to its handle A from the
position shown in Figure 2 to that shown in Figure 1 from being moved too far,
prefer to form the extension a² with a shoulder a³ which, as shown in dotted lines
in Figure 1, is adapted to abut against a corresponding shoulder at on the handle
part A.
The pins B and C may be provided with any convenient form of head or
equivalent means by which they can be operated or they can be arranged as spring
detents capable of automatically locking and only having to be withdrawn when
required.
At the ends of the handles I prefer to employ a convenient form of hook or
detent which may have two or more engaging portions so that the handles may be
fixed or locked at a suitable distance apart. For this purpose pins or projections
may be provided upon the handles with which the hooks engage; or said detent
may be constructed in the manner illustrated in the accompanying drawings where
it is shown to consist of a rack E having ratchet teeth, pivotted at one end to the
handle A wherein is provided a spring E' adapted to act on the rack E in the same
manner as the spring of a pocket-knife does on the blade, so as to hold it in either
the position shown in Figures 1 and 3 or that shown in Figure 2. The free end of
the rack E is adapted to engage with a tooth F of the handle F which and the
blade F thereof are otherwise of ordinary construction.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is ;-
-
1. In midwifery forceps the employment of a jointed blade and handle substantially
as described and illustrated in the accompanying drawings.
2. In midwifery forceps the employment in combination with one of the handles
of a blade which may at will be either rigidly secured to it in the relative position
shown in Figure 1 allowed to pivot freely in or upon it as shown in Figure 2 or be
entirely disconnected from it substantially as described and illustrated in the
accompanying drawings.
3. In midwifery forceps a blade and handle such as A' A adjustably fitted
together by means of two jaws an extension and pins such as a a¹ a² and BC
substantially as described and illustrated in the accompanying drawings.
4. The combination with the midwifery forceps characterized in the third
claiming clause of a device for locking the two blades and handles together
consisting of a pivotted rack rack-spring and tooth such as E E¹ and F¹
substantially as described and illustrated in the accompanying drawings.
Dated this 14th day of September 1893.
D. MACDONALD.
W. P. Thompson & Boult,
Agents for the Applicant..