Year: 1887

page_text: We, SAMUEL CHATWOOD of Prestwich, in the County of Lancaster, Bankers
Engineer, and SAMUEL RAWSTHRONE CHATWOOD of 76 Newgate Street, in the City
of London, Manager, do hereby declaro the nature of this invention to be as
follows:-
Our invention consists in giving a rotary motion to the follower for the purpose of
withdrawing the bolt by a push or pull action of the knob or handle, at the same
time if desired retaining the power to withdraw the bolt by the turning of the handle.
The arrangements for effecting this may be varied in detail but the following we
prefer.
Wo sometimes provide one or more projections on the portion of the spindle outside
the door working in spiral or inclined grooves in the neck of the knob or handle or
one or more projections within the neck of the knob or handle working in spiral or
inclined grooves in the spindle. The portion of the spindle which passes through the
follower we sometimes fit loosely so that the inclined grooves and projections may if
desired be on one side of the door only. The rose may also he rifled and the neck of
the knob or handle provided with corresponding projections, or the projections may
be on the rose and the inclined grooves outside the neck of the knob or handle. When
the knobs or handles are pushed or pulled the spindle in the follower is caused to rotate
sufficiently to withdraw the bolt or latch. When in addition to the push and pull
action it is desired to withdraw the bolt by turning the handle we so arrange that the
knob is free in the direction to turn without push or pull but not so in the other
direction.
We sometimes place a suitable spring between the knob and lock to assist in bringing
back the knob to the latched position.
CARPMA EL & Co.,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Furniture for Locks and Latches.
We, SAMUEL CHATWOOD of Prestwich, in the County of Lancaster, Banker's
Engineer, and SAMUEL RAWSTHRONE CHATWOOD of 76 Newgate Street, in the City
of London, Manager, 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 :—
For the purpose of giving a rotary motion to the follower of a lock or latch for
withdrawing the bolt by a push or pull action of the knob or handle and at the same
time if desired retaining the power to withdraw the bolt by the turning of the handle -
We sometimes provide one or more projections on the portion of the spindle inside
the door working in spiral or inclined grooves in the neck of the knob or handle or
one or more projections within the neck of the knob or handle working in spiral or
inclined grooves in the spindle.
Figure 1 of the drawings annexed is a longitudinal section of lock furniture formed
in the above manner.
A is the spindle made with a square portion B at the centre to fit the ordinary square
hole formed through the follower C of the lock-D is the bolt which may be drawn
back by the follower in any ordinary manner-E E are spiral grooves cut in the two
end portions of the spindle. F F are the stems of the knobs they carry pins G which
are made at their inner ends to enter into the grooves E in the spindle-H (shewn
separately at Figs. 2) is a tubular guide for the stem of the knobs-it is secured to the
sides of the door by the flange H which projects outwards from it. The pins G
project outwards from the stems F of the knobs and enter slots cut in the sides of the
tubular guides H. The slots are shaped and permit the knob to be turned in one
direction and make it to turn the follower but will not allow it to turn in the opposite
direction in which it would only screw back off the spindle-I is a rose which
is secured to the door by screwing it to the tubular guide or rose H and forms a cover
for the same whilst it also gives a neat appearance to the furniture.
The portion of the spindle which passes through the follower we sometimes fit
loosely so that it may move endwise in this case the grooves and projectious in
the spindle and neck of the knob respectively need only be used on one side of the
door.
In place also of the inclined grooves and projections being in the spindle and neck
of the knob the rose may be rifled and the neck of the knob or handle be provided
with corresponding projections or the projections may be on the rose and the inclines
outside the neck of the knob or handle.
With this construction the spindle which passes through the follower is made
square the rose is made as shewn at Figures 3 with inclines J in its interior and the
neck of the knob or handle has secured to it a piece K (shewn at Figures 4) on which
are corresponding inclines. The necks of the knobs or handles are also fixed to the
ends of the spindle.

page_text: When the knob on one side of the door is pushed or the knob on the opposite side
pulled the inclines cause a partial turn to be given to the spindle and so to the
follower or the knob can be turned in one direction without being pushed or pulled
but is prevented by the inclines bearing against one another from being turned in the
opposite direction.
The piece K may be secured to the neck of the knob in the same way as in the
furniture shown at Figure 5.
lock
If it be required that the knob which is held in the hand should not turn at the
same time that the spindle is by it pushed or pulled endwise the knob may be made
capable of swivelling around its stem and if also it be desired that the bolt of the
be withdrawn by turning the knob as well as by a pull or push upon it
then any suitable ratchet arrangement may be used in addition which allows of the
spindle turning in one direction independently of the knob but not in the opposite
direction.
may
In the construction of furniture shewn at Fig. 5 the portion of the spindle which
passes through the follower is rifled and works into a bushing L which is square on
its exterior and fits into the ordinary square hole which is formed through the follower.
The bushing L is shown separately at Figures 6. The tubular guide or rose H (see
Figs. 8) is formed with straight longitudinal projections J on its interior-the piece K
shewn at Figures 7 is also correspondingly formed with straight projections which
when the bolt of the lock is shot rest against the projections J in the manner shewn
at Figure 8. The neck of the knob being secured to the piece K and to the spindle a
partial turn will be given to the follower when the spindle is moved end wise either by
a pull on the knob on one side of the door or by a push on the knob on the opposite
side. Or a partial turn may be given to the follower by turning the knobs in the
direction that the projections J permit of its being turned but are prevented by these
projections from being turned in the opposite direction-that is in the direction in
which the turning of the spindle would not turn the follower but would simply cause
the spindle to move endwise through it-M is a coiled spring interposed between the
bushing and the piece K which is secured to the end of the neck of the knob-the
spring assists in moving back the spindle and knobs into the position which they
occupy when the bolt is shot.
The
The knob is fixed to the piece K and to the spindle in the following manner.
piece K where the screw threaded spindle passes through it is formed as a nut to fit
to the quick screw thread of the spindle. The interior of the neck of the knob is
formed as a nut to screw on to a fine screw thread which is also cut around the
extremity of the spindle. When the piece K has been adjusted to its proper position
upon the spindle the stem of the knob is screwed on to the spindle until its end comes
against the piece K. The two are then locked together by a screw pin passed trans-
versely through both of them so that both must turn together. Consequently as one
of them engages with the quick screw thread on the spindle and the other with the
slow screw thread cut around it all movement of the knob upon the spindle is
prevented.
Many of the parts above described need only be applied on one side of the door-
on the opposite side the knob may be permanently fixed to the spindle in any desired
manner and the rose may be made plain as shewn at Figures 9.
It will be seen that with this construction of furniture and with the other con-
structions of furniture above described any ordinary existing lock may without any
change in the lock itself be converted into a push and pull lock simply by changing
the furniture used with it and this is done without interfering with the power of
being able to withdraw the bolt of the lock by turning the knobs or handles.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what wo
claim is:-
1. The construction of lock furniture with screw threaded grooves and projections
on the ends of the spindles and interior of the neck of the knobs or bandles so that

page_text: the bolt of the lock to which the furniture is applied may be withdrawn by a pull or
by a push on one or other knob or by the turning of the knobs substantially as
described.
2. The construction of lock furniture with screw threaded grooves and projections
on the exterior of the stems of the knobs or handles and interior of the rose so that
the bolt of the lock to which the furniture is applied may be withdrawn by a pull
or by a puh on one or other knob or by turning the knobs substantially as
described.
3. The construction of lock furniture with a screw threaded spindle working into a
screw nut bush inserted into the ordinary square hole formed through the follower of
a lock substantially as described.
4. The means substantially as described for securing a knob or handle to the screw
threaded spindle.
5. The construction of lock or latch furniture substantially as described with
reference to Figure 5.
Dated this 14th day of November 1887.
CARPMAEL & Co.,
Agents.