Improvement in DOTS OT DOUID and CHO I
Year: 1886

page_text: Date of Application, 23rd Dec., 1886
Complete Left, 19th Sept., 1887 -
Complete Accepted, 21st Oct., 1887
Improvement in DOTS OT DOUID and CHO
I FREDERICK HOWARD COLLINS 26 Cumberland Street Birmingham in the County
of Warwick Brassfounder do hereby declare the nature of this invention to be as
follows:-
Instead of attaching the Thumb bit push piece or knob rigidly to the Rod as is
usually done I allow it a slight rocking motion lengthways & on the underside form
two studs pegs or projections I cut in the back plate of the bolt two slots or
recesses one at each end of the part traversed by the Thumbbit into one of these Slots
one of the studs can fall & is then retained by the action of a spring attached to the
rocking Thumb bit.
When the bolt is shot the stud nearest the forę end is engaged in the corresponding
slot in the back plate.
When it is desired to withdraw the bolt the pressure of the fingers first causes the
Thumb bit to rock on the disengaged stud & withdraw the other stud out of the slot
in which it was locked the Thumb bit can now slide to the other end of the traverse
when the second stud falls into the other slot & is secured by the action of the spring
as described.
When it is desired to shoot the bolt the action is precisely similar in the opposite
direction.
It is thus seen that the Thumb bit is securely retained or locked at each end of its
traverse & with it of course the rod or shoot to which it is attached.
This invention is applicable to Flush Socket or other kinds of bolts.
Dated this 22nd day of December 1886.
FREDERICK H. COLLINS.

page_text: I FREDERICK HOWARD COLLINS of 26 Cumberland Street Birmingham in the
County of Warwick Brassfounder 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 :-
In any ordinary Bolt (Flush, Cut, Socket or other kind) instead of attaching the
Thumb bit, knob or Push piece rigidly to the rod as is usually done I allow it a slight
rocking motion lengthwise & on its underside form two studs (A & B) (pegs or
projections) I cut in the plate of the bolt two slots (a & b) or recesses one at each ond
of the traverse of the thunib bit into the slot "a" the stud "A" can engage & into the
slot "" the stud "B" can engage & each is retained in position by the spring "E."
When the bolt is shot the stud "B" is engaged in the slot "b.""
E.
When it is desired to withdraw the bolt the pressure of the fingers causes the
Thumb bit to rock or roll on the disengaged stud "A" compressing the Spring "E"
& withdrawing the stud "B" out of the slot "b." The Thumb bit now moves by the
continued pressure to the other end of its traverse & the stud "A" being opposite the
slot "a" engages in the same & is retained by the action of the spring
When it is desired to shoot the bolt this proceedure is merely reversed.
This invention is shown on Figures 1 & 2 as applied to a Flush Bolt; in 3 & 4 as
applied to a Cut Bolt; & in 5 & 6 as applied to a Socket or Barrel Bolt in all of
which the letters "A & B" indicate the studs & "a & 6" the corresponding slots "E"
being the spring.
Or I fix a plate on the stem of the Rocking Thumb bit as in Fig. 7. the pressure
of the fingers then causes the end "C" to clear the stop "e" & when the other
extremity of the traverse is reached the end "D" comes against the stop "d" & is
secured by the action of the spring "e" in the same manner as the end "C" was 2
secured by the action of the spring "E."
This is shown applied to a cut bolt but is applicable to any other kind.
Or I make the Thumb bit in 3 parts as shewn in Figure 8 one of which "F" is
firmly fixed to the shoot and the other two rock on it "G" securing the bolt when shot
out being retained in the slot "g" by the action of the spring "E" & "H" securing a
it when withdrawn by engaging in the slot "" being retained in the same way by
the spring "E.”
This is shown applied to a Cut Bolt but is applicable to any other kind.
I do not bind myself to the particular arrangements heroin described & shown

page_text: as the invention is applicable to all kinds of bolts & may be modified to suit special
circumstances.
Having now particularly described & ascertained the nature of my said Invention
and in what manner the same is to be performed I declare that what I claim is
1st. A Rocking Thumb bit with catches controlled by a spring.
2nd. A Rocking Thumb bit with plate & stops controlled by two springs.
3rd. A Thumb bit with two Rocking catches controlled a spring or springs
substantially as described & applicable to any kind of Bolt for Doors and the like.
Dated this 17th day of September 1887.
FREDERICK HOWARD COLLINS.