Year: 1890

page_text: Date of Application, 8th May, 1890
Complete Specification Left, 7th Feb., 1891-Accepted, 14th Mar.,
1891
1, HEINRICH GREFEN, Manufacturer, of Oberhausen, Germany, do hereby
declare the nature of this invention to be as follows:-
My electric-lock contains, in addition to the latch or bolt, an auxiliary bolt which
serves to operate the main bolt by means of a two-armed lever placed between the
two bolts at a right angle to the same and having suitable rounded ends which enter
suitable recesses of the bolts.
An electro-magnet is placed in the interior of the lock case and provided with an
armature which has the shape of a bell-crank-lever.
The upright arm of the armature lever has at its extremity a hook or catch
adapted to hold one end of a two-armed balance lever, the other arm of which is
provided with a weight. This weight descends, as soon as the opposite arm of the
balance lever is disengaged from the catch of the armature lever, and thereby
releases also the auxiliary bolt, which is connected with the weighted lever by a
slotted link and a double armed lever provided with a hook. The auxiliary bolt is
shot forward by a powerful spring, and thereby turns the intermediate lever which
withdraws the main bolt or latch. The door can now be opened. The auxiliary
bolt has an inclined face. so that the act of opening the door throws the auxiliary
bolt again back into its original position. During this motion a downward
projection of the auxiliary bolt acts on the corresponding nose of the weighted
lever, so as to lift the weighted arm.
On the closing of the door, the latch enters as usual the aperture of the lock case,
without being hindered by the weighted lever.
In order to open the lock from the outside, a key is introduced through a key
hole placed in such a position that, on the key being turned round, the key bit
comes into contact with a lateral extension of the armature lever and turns the said
lever on its axis, so as to release the weighted lever. The key may, however, be
arranged to act direct on the bolt.
The spring which acts on the auxiliary bolt is stronger than that which operates
the main bolt or latch, and is provided with a device for coiling it. The axles on
which the springs are coiled, are provided with ratchet wheels, and the pawls of
these wheels can be set out of action through slots formed in the lock casing.
Dated this 6th day of May 1890.
FAIRFAX & WETTEK,
433, Strand, London, Agents.
COMPLETE SPECIFICATION.
An Electric Door-lock.
I, HEINRICH GREFEN, Manufacturer, of Oberhausen, Germany, 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
0 statement:—
My electric lock contains, in addition to the latch or bolt, an auxiliary bolt which
serves to operate the main bolt by means of a two-armed lever placed between the

page_text: drawings. Figs. 1 to 10, of which Figs. 1 and 6 represent two different types of
locks in a closed position, while Figs. 3 and 8 show the same in an open position.
The remaining figures are horizontal and vertical sections.
is the main bolt or latch, the auxiliary bolt, the intermediate lever, and e
the fulerum of the same.
If the electric circuit controlling the electro-magnet is closed, the armature d
will be attracted, thereby withdrawing the trigger or detent d from the lever h
which has its fulerin at Figs. 1 to 5 or from the escapement or ratchet wheel
(Figs. 6 to 10). By this operation, the lever i, or the wheel ', and consequently
the bolt, becomes free, and the bolt or latch a is drawn back.
If in the arrangement shown by Figs. 1 to 5. the nose d' is withdrawn from the
lever h, the latter is pulled down at the back by the weight in com quence of
which the rod pulls down also the rear arm of the lever pivoted at, so that the
nose of the same will be lifted above the nose of the holt, and the latter
consequently becomes free. In order that the hook-lever may descend sooner, the
links en arranged in such a manner, that it is allowed to fall freely, before
it acts on the lever. The bolt is now shot forward by the powerful spring:
thereby the lever & is turned and the upper bolt or latch a is withdrawu (Fig. 3).
The door can now be opened, because the bolt a slants of in such a manner, as to
recede during the act of opening the door and assumes again the position shown by
Fig. 1. in which the hook of the lever again falls in, because the nose will again
slide behind the hook, and the lever i again pressed downward by the nose a
formed on the bolt a' and coming into contact with the nose h².
r
Fig. 6 to 10 show a simpler construction of the luck. In this melification the
rear part of the bolt a' is provided with teeth gearing with a toothed pinion which
is provided with a toothed wheel, as shown, or with a lever or a toothed segment.
If the armature is attracted, the tooth releases the wheel ♬ (or the segment or
lever) thereby releasing also the holt al, which is now shot forward by the spring 1.
In consequence of this, the lever I will turn on its fulerum e and withdraw also the
latch or main bolt a.
If now the door is drawn open, the slanting holt a will be pressed back by the
striking plate (fixed to the door frame) and thereby the pinion together with the
wheel (or the segment or lever) attached to it, will be turned, so that one of
the ratchet teeth slides behind the tooth a', and the mechanism assumes again the
position shown by Fig. 6.
Thus, during the act of closing the door, the bolt, which is slanted off in the
usual munner, drops into the opening of the striking plate, because the lever / will
not prevent the return motion of the bolt. The bolt a is slightly rounded or
bevelled at its extremity, to avoid unnecessary friction on the striking plate during
the act of closing the door.
In order that the lock may be opened from without also by the key, a key hole
is applied in such a manner, that the key bit, on being turned, will meet the
projection of the lever d and disengage the latter. The arrangement may,
however, be so modified, that the key itself will set the bolt in motion. If desired,
a special tumbler or other safety device may be combined with the key.
As the spring must be stronger than the spring, in order that the latter may
recede during the forward motion of the bolt a', a tension device or regulator is
provided for both springs or for one of them. This device comprises a ratchet
wheel fixed on the pin or spindle on which the spring is coiled (Figs. 1 to 4) and a
ratchet pawl, which can be released through a slot of the lock plate or casing.
In order to operate the latch a by hand, without closing the electric circuit, it
has at its rear end a spindle which passes through the rear of the lock casing and
is provided with a knob, as shown by Figs. 6 and 8. The bolta has some clearance
in the opening of the striking plate, so that on the commencement of its return
motion, the bolt a will already meet the striking plate at the side of its opening
, and cannot return into the latter.
If desired, the lock may be provided with an ordinary night bolt.

page_text: 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 :-
A door-lock with electric opening device, in which the latch or main bolt is
caused to recede by means of an auxiliary bolt a' adapted to be operated from the
armature of an electro-magnet by means of a trigger d', weighted lever h, link k
and hooked lever i, or by means of a ratchet wheel and a pinion or analogous
mechanism, while the return of the mechanism to its starting position is effected by
the act of opening the door and the consequent return motion of the auxiliary bolt,
substantially as described.
Dated this 4th day of February 1891.
H. GREFEN.
By Fairfax & Wetter,
Agents.