Improvements in Magnetically Operated Locks, suitable for Safety Lamps or other purposes.
Year: 1899

page_text: Date of Application, 21st Oct., 1899-Accepted, 2nd Dec., 1899
COMPLETE SPECIFICATION.
Improvements in Magnetically Operated Locks, suitable for Safety
Lamps or other purposes.
I, HEINRICH MANDT, of Bochumerstrasse 14A, Linden, in the Empire of Germany,
Miner, 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:-
This invention relates to improvements in magnetically operated locks suitable
for safety lamps or other purposes and consists of a lock operated by a double
or two magnets and is especially suitable for such safety lamps which are locked
by turning the upper threaded part upon the oil receiver suitably provided with
a female thread.
Such locks, also double locks which can only be opened by means of magnets
after drawing two locking parts back in opposite directions, are known, for
instance, that of the English Patent No. 12870 of 1893. With regard to these
known locks the purpose of the present invention consists in augmenting the
safety against unauthorized opening. The locking is in this case not effected
by the engagement of the two locking parts by the direct action of the upper or
under part of the lamp which must be turned for opening and closing purposes,
but by means of a cross bolt to be inserted into which the two locking pins engage
in a springlike manner on both sides so that the cross bolt can neither be inserted
or withdrawn except by the use of the magnets and in any case turning of the
upper part for opening is prevented when the cross bolt is in place.
By this means the lamps can also only be closed by the person in charge of the
magnets, which gives a further control over the regular locking of the lamps
before their delivery to the miners and renders all trials to open the lock in an
unauthorized manner useless.
The manner of operating and the construction of the improved lock of this
invention are shown in the annexed drawing in which:
Figs. 1 and 2 show side and front views respectively of the oil receiver of
the lamp provided with the locking means.
Fig. 3 shows a section of the lock casing on the oil receiver.
Fig. 4 is a separate view of the locking bolt.
Fig. 5 is a section in the line - in Figure 3 on an enlarged scale.
Figs. 6 and 7 are front and side views of the special magnet key for opening
purposes.
On the oil receiver a the lock housing is fastened which is provided with
a central slot e which is closed above and below by plates d. On the upper part e
of the lamp a hinged plate provided with a slot f exactly coinciding with the
slote is arranged (Figs. 1 and 2) which can be fastened against the lock housing
by means of a cross piece or bolt inserted into the slot and holding by means
of its plate the hinged plate f fast, as soon as itself is locked in the slot c.
This is done in the present invention by two locking pins engaging from both
sides and in the same vertical plane into holes & arranging in the cross piece or
bolt y and are held in the locking position by spiral springs 7. The springs

page_text: abut against lightly fixed rings which allow the locking pins i to pass. For
opening the lock both locking pins have therefore to be withdrawn in opposite
directions.
This can be done by means of two separate magnets being brought near to the
locking pins one on each side of the housing, but it is preferably effected by
means of a special magnet key (Figs. 6 and 7) in which the two magnets PP
are connected by a bowo provided with a handle and arranged at different
heights as shown in Fig. 6. The locking key has also to be used to withdraw the
pins before the lamp can be properly locked again.
In order that the lock cannot be manipulated by a single magnet further
protection against unauthorized unlocking can be done by extending the rings t
(Fig. 5 and accordingly the lock-housing) so far that the outer ends of the
locking pins lie when in the open position still within the rings and do not
project outside the lock-housing, so that the pins cannot be held in the extended
position except by a magnet; a thin locking plate may close the ring openings on
the outside.
Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed I declare that what
I claim is:
An improved magnetically operated lock for safety lamps or other purposes in
which the locking is done by the aid of a cross bolt g which is inserted sideways
into a slot in a housing arranged on the one lamp part, which securely fastens
the other lamps part by means of a hinged plate f arranged thereon, two elastic
pins for locking the cross bolt g being arranged in the housing so that the
withdrawal and insertion of the cross-bolt can only be done when the two
locking pins are withdrawn in opposite directions by means of two magnets.
Dated this 21st day of October 1899
HERBERT HADDAN & Co.,
Agents to Applicant, 18, Buckingham Street, Strand, W.C.