IMPROVEMENTS IN LOCKS
Year: 1884

page_text: I RICHARD WHITAKER of 18 Lower Villiers Street, Wolverhampton in the
county of Stafford do hereby declare the nature of my invention for IMPROVEMENTS
IN LOCKS to be as follows:-
For the greater security combined with simplicity of construction of locks at
a moderate cost so that should an attempt be made to press back the bolt for the
purpose of picking the bolt is immediately stopped by a lever which I call a detent
lever being brought into action by such pressure. To attain this the ordinary
levers are mounted on a pin fixed in the said detent lever this detent lever being
mounted on a pin fixed in the lock plate at or about a right angle with the
throw stump and the pin fixed in the detent lever. In the free end of the
horizontal part of this slot the throw stump travels during the locking and
unlocking of the bolt when pressure is applied to the bolt the free end of the
detent lever is raised the throw stump is then in the lower portion of the vertical
part of the slot and thereby prevents the bolt being forced back and in order that
the levers may be removed entirely out of contact with the throw stump should
the pressure be continued I make the vertical part of the slot at such an angle that
a further receding motion shall be given to the ordinary levers and by so doing
draws back these levers through a greater space than that through which the bolt
is pressed.
By reversing the position of the pins and also the vertical part of the slot
I make the detent lever. to fall instead of to rise when pressure is applied to the
bolt.
"
It will be seen that the detent lever may be worked either above or under
the bolt.

page_text: I RICHARD WHITAKER of 18 Lower Villier's street Wolverhampton in the
County of Stafford Lock Manufacturer do hereby declare the nature of my
invention for IMPROVEMENTS IN LOCKS and in what manner the same is to be.
performed, to be particularly described and ascertained in and by the following
statement:
For the greater security combined with simplicity of construction of locks at
a moderate cost so that should an attempt be made to press back the bolt for
the purpose of picking the bolt is immediately stopped by a lever which I call
a Detent Lever Figure 3, being brought into action by such pressure To attain
this the ordinary levers are mounted on a pin marked fixed in the said Detent
Lever which Detent Lever is mounted on a pin b. Figure 1 fixed in the Lock
plate at or about a right angle with the throw stump c. Figure 2 and the pin a.
fixed in the Detent Lever In the free end of the Detent Lever is an L shaped
slot d along the horizontal part e of this slot the throw stump travels during the
locking and unlocking of the bolt When pressure is applied to the bolt the free
end of the Detent Lever is raised as in Fig. 6 the throw stump is then in the
lower portion of the vertical part of the slot and thereby prevents the bolt being
forced back In order that the levers may be removed entirely out of contact with
the throw stump should the pressure be continued I make the vertical part of the
slot at such an angle that a further receding motion shall be given to the ordinary
levers and by so doing these levers are drawn back through a greater space than
that through which the bolt is pressed By reversing the position of the pins a. b.
Figures 3. and 1. and also the vertical part of the slot I make the. Detent Lever to
fall instead of to rise when pressure is, applied to the bolt It will be seen that
the Detent Lever may be worked either above or under the bolt.
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
•
1. Tho Detent Lever substantially as and for the purposes described.