PROVEMENTS IN THE CONSTRUCTION OF LOCKS CALLED WEDGE-LOCK
Year: 1878

page_text: LETTERS PATENT to Lorentz Albert Groth, Civil Engineer and Proprietor of
"E
IM-
the Scandinavian Patent and Mercantile Office, under the Firm of L. A. Groth.
& Co., of Stockholm, in the Kingdom of Sweden, for the Invention of
PROVEMENTS IN THE CONSTRUCTION OF LOCKS CALLED WEDGE-LOCK." A
communication by Carl Wettergren and Marcus Holter, both of Gothenburg,
in Sweden.
Sealed the 2nd August 1878, and dated the 4th February 1878.
PROVISIONAL SPECIFICATION left by the said Lorentz Albert Groth at
the Office of the Commissioners of Patents on the 4th February 1878.
LORENTZ ALBERT GROTH, Civil Engineer and Proprietor of the Scandinavian
Patent and Mercantile Office, under the Firm of L. A. Groth & Co., of Stockholm, in
the Kingdom of Sweden. "IMPROVEMENTS IN THE CONSTRUCTION OF LOCKS
CALLED WEDGE-LOCK." (A communication by Carl Wettergren and Marcus Holter,
both of Gothenburg, in Sweden.)
The object of this Invention is to construct door locks which shall be easy to
open or close only by drawing or pushing the knob or handle, and if desired also to
be locked by an ordinary key.
The
The spring bolt works in guides, and has a notch below for the nose of a lever to
fall into for holding this bolt in the outer position when the lock is locked.
middle portion of this bolt is thinner, and a spring pressing against the so formed
projection tends to close the bolt, which is formed with a rectangular hole, through
which, at one end, is formed with an incline; the stem of the knob is formed with
a corresponding incline or nose, and by pushing the knob (as regards one side of the
door) or pulling the knob (as regards the other side of the door) the spring bolt is
forced back, thus opening the lock against the pressure of a spring.
"
The "lever consists of two similar parts or halves at each end, provided with a
nose, the outer one taking into the aforesaid notch in the spring bolt, the other
taking against the inner end of the "dead bolt." Each half of the lever has a
I Price fid1

page_text: thinner lug for the outer part or tooth of the key to pass between. The lever turns
on a pin in the middle, and is by a flat spring held up to lock the spring bolt. The
lever is below the spring bolt, and the dead bolt is below the lever.
The dead bolt is cut out for the key, and suitably guided.
The key being put in and turned, it will, with two shorter or inner parts, come
against the lugs of the lever a moment before the outer narrower part falls into the
notch in the dead bolt, the lugs of the lever are pushed to one side, the lever turns
on its fulcrum pin, so that the front nose of the lever goes out of the notch in the
spring bolt while the back end of the lever is raised, its nose at the rear end riding
on the top edge of the dead bolt during the back movement of the latter. The
lock is now unlocked, but the spring bolt is still in the closed or forward position;
by pressing on the knob (against one side of the door in the direction of its opening)
or by pulling the knob (against the other side of the door), all according as to
whether the person is on one side or the other of the door, the spring bolt is with-
drawn, and the door will then open, the same movement that opens the door also
undoing the spring bolt; the aforesaid spring brings the latter back on letting go
the knob.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Lorentz Albert Groth in the Great Seal Patent Office on the
3rd August 1878.
LORENTZ ALBERT GROTH, Civil Engineer and Proprietor of the Scandinavian
Patent and Mercantile Office, under the Firm of L. A. Groth & Co., of Stockholm, in
the Kingdom of Sweden. IMPROVEMENTS IN THE CONSTRUCTION OF LOCKS
CALLED WEDGE-LOCK." (A communication by Carl Wettergren and Marcus Holter,
both of Gothenburg, in Sweden.)
The object of this Invention is to construct door locks which shall be easy to
open or close only by drawing or pushing the knob or handle, and if desired also
to be locked by an ordinary key.
Figure 1 of the accompanying Drawings is a plan of the lock; Figure 2 is a
front view of same without the working parts; and Figure 3 a similar view with
the working parts; Figures 4 to 9 are details of the latter; and Figures 10 to 12
are details of knob and key; Figure 10a is an outside side view of the lock.
The spring bolt A works in guides a, a, and has a notch all below for the
nose of a lever d to fall into for holding this bolt in the outer position when the
lock is locked. The middle portion of this bolt A is thinner, as shewn in Figure 8,
and a spring f, Figures 3 and 7, attached at 1, and pressing against the so-formed
projection, tends to close the bolt which is formed with a rectangular hole through
which, at one end, is formed with an incline a¹; the stem of the knob n, Figure 11,
is formed with a corresponding incline or nose n², and by pushing the knob (as

page_text: regards one side of the door) or pulling the knob (as regards the other side of the door)
the spring bolt is forced back, thus opening the lock against the pressure of a spring.
The lever is shewn separately at Figure 5, it consists of two similar parts or
halves d, d', and c, c¹, at each end provided with a nose, the outer one taking into
the aforesaid notch all, in the spring bolt A, the other taking against the inner end
of the "dead bolt "B; each half of the lever has a thinner lug c and d respectively
for the outer part or tooth of the key to pass between. The lever turns on a pin i
in the middle, and is by a flat spring e (which is shewn separately in Figure 6)
resting on the stop k, held up to lock the spring bolt A. The lever is below the
spring bolt A, and the dead bolt B is below the lever.
The dead bolt B is cut out for the key, and suitably guided, say by a lug g
working in a slot 6', as here shewn, see Figure 9, which is a separate view.
The key being put in and turned, it will, with two shorter or inner parts 1 and
2, come against the lugs c¹, d', of the lever a moment before the outer narrower
part 3 falls into the notch in the dead bolt B; the lugs c, d, of the lever are
pushed to one side, the lever turns on its fulcrum pin i, so that the front nose of
the lever goes out of the notch all in the spring bolt A while the back end of the
lever is raised, its nose at the rear end riding on the top edge of the dead bolt B
during the back movement of the latter, as shewn in dotted lines, in Figure 3. The
lock is now unlocked, but the spring bolt A is still in the closed or forward
position; by pressing on the knob; Figure 11 (against one side of the door in the
direction of its opening) or by pulling the knob (against the other side of the door)
all according as to whether the person is on one side or the other of door, the
spring bolt A is withdrawn, and the door will then open, the same movement that
opens the door also undoing the spring bolt A.; the aforesaid spring f brings the
latter back on letting go of the knob.
Figure 12 shews the rose o for the knob.
In the position shewn in Figure 3 of the Drawings the door is closed and locked,
and cannot be opened by the knob until the dead bolt B is withdrawn by means of
the key.
The spring bolt and knob may also be used without the dead bolt.
And having thus described and ascertained the nature of this Invention, I declare
that I claim,
Firstly. Forming the spring bolt A of a lock with a slot formed behind with a
slanting part or incline a' for the stem of the knob to pass through as and for the
purpose set forth.
Secondly. Forming the knob stem with an incline nose or wedge n', whereby the
spring bolt is pushed back when the knob is pushed (as regards one side of a door)
or pulled (as regards the opposite side of a door), as set forth.
Thirdly. A spring bolt A. and knob stem with nose n³, constructed and operating
as set forth in combination with a dead bolt and "lever," as set forth.
Fourtbly. The construction of lock as illustrated in the accompanying Drawings.
In witness whereof, I, the said Lorentz Albert Groth, have hereunto set my
hand and seal, this Thirty-first day of July, in the year of our Lord
One thousand eight hundred and seventy-eight.
LORENTZ ALBERT GROTH. (L.S.)