Improvements in Separable Joints for Surgical Scissors, Nippers, and other like Implements.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Separable Joints for Surgical Scissors, Nippers, and
other like Implements.
I, WILLIAM EDWARDS GRAY, of Boston Street, City of Sheffield, Surgical
Instrument Maker, do hereby declare the nature of my invention to be as
follows:-
My invention relates to improvements in the construction of separable joints for
surgical scissors and nippers, and for the joints of other scissors and implements
which are required to separate for cleaning and other purposes.
My invention which is of a simple nature has for its object to facilitate the
operation of separating and replacing the two parts of such implements.
I carry out the invention as follows, one part of the joint consists of a headed
pin, screwed or rivetted into one of the blades of the implement, and the other
blade is provided with an open-end slot to pass over the shank of the pin, and is
counter sunk to receive the head of the pin.
Instead of rounding the underside of the slotted blade to enable it to be passed
upon the pin, which reduces the wearing surface, and thus causes the blades, after
a comparatively short time, to work loosely and deteriorates the cutting qualities,
which is a serious defect in surgical instruments, I leave the underside of this
blade flat or thereabouts, and I form a concavity across the other blade within
which the pin is fixed.
This arrangement permits the engagement of the slot with the pin, and retains
the flat upon each blade which constitutes the bearing and wearing surfaces.
Dated the 27th day of September 1897.
ROBT. F. DRURY, C.P.A.,
Agent for Applicant,
Bank Buildings, George Street, Sheffield.
Improvements in Separable Joints for Surgical Scissors, Nippers, and
other like Implements.
I, WILLIAM EDWARDS GRAY, of Boston Street, City of Sheffield, Surgical
Instrument Maker, 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:―
My invention relates to improvements in the construction of separable joints

page_text: for surgical scissors and nippers, and of other scissors and implements which are
required to separate, for cleaning and other purposes.
The object of my invention which is of a very simple nature, is to render such
joints more durable and better fitting than they have hitherto been, while retaining
equal facility in the method of opening and replacing the parts.
The construction of the joint parts is shown in the annexed sheet of drawings,
in which :
Fig. 1, represents the inside face, and the edge of one of the shanks or divided
parts of a surgical nipper, with the joint pin.
Fig. 2, represents the inside face, and also the outside of the companion shank
with the slot and countersink.
Fig. 3, shows the position of the two parts when being put together, or
separated.
The invention is carried out as follows: in all cases the scissor, nipper, or other
instrument or implement consists of two or more parts as will be understood, and
are intended to work upon a fulcrum after the method of scissors.
One of the parts is represented, as an example only, in Fig. 1, the inner face
being marked A, and the edge view B.
A shallow transverse groove E, is made at the point where the joint is to be
situated, and a pin F, or stud with a head is securely fixed in the position as shown,
the adjacent faces of part A being flat for the companion part to bear upon.
The other part is shown in Fig. 2, its inner face which is flat is marked C, and
its rounded outside is marked D.
This part is provided with an open end slot G, to receive and fit upon the shank
part of the pin F, and the closed end of the slot G, is countersunk at H, to receive
the head of the pin which is of a corresponding configuration.
In Fig. 3, I show the two parts in the only position in which they can be
disengaged, or engaged, and for either operation it is necessary to give the slotted
part a sliding segmental action following the face of the groove E, under the head
of the pin F, reversing the movement as the case may be.
When the two parts are engaged and are turned into working position, the flat
surface of A, bears against the flat surface of C, which constitutes a large and
durable wearing surface.
I am aware that surgical scissors have been made with detachable parts or
separable joints, and I therefore make no claim to such, broadly, but these being
usually made with one of the inner faces rounded, the surface or bearing face is
thereby reduced, and after a short time in use the scissors so constructed wear
loose, and the cutting quality is impaired, which is a serious defect in surgical
instruments.
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:
The improved construction of a separable joint for surgical instruments and
other like jointed instruments, as hereinbefore described and shown.
Dated the 11th
ROBT. F. DRURY, C.P.A.,
Agent for Applicant, George Street, Sheffield.