Improvements in Locks. for Sliding Doors.
Year: 1895

page_text: Date of Application, 19th Mar., 1895-Accepted, 20th Apr., 1895
COMPLETE SPECIFICATION.
Improvements in Locks. for Sliding Doors.
We, AUGUST LÜBBE, of 42 Cogswell Street, Cambridge, and WILLIAM
JOSEPH KEATING, of 77 Hudson Street, Boston, both in the State of Massachusetts,
United States of America, Locksmiths, 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 locks which are adapted to be placed upon sliding doors
(often termed folding doors) for the purpose of locking them together; and it
consists of a lock constructed somewhat on the Yale lock principle, and in the
manner hereinafter described, and illustrated in the accompanying drawings, in
which-
Fig. 1 represents a transverse vertical section of a portion of a couple of sliding
doors provided with my improved lock, which is shown in longitudinal vertical
section in position therein.
Fig. 2 is a transverse vertical section of the lock taken on line y, Fig. 1.
Fig. 3 is an elevation of the "striker" or plate on the door which is to receive
the bolt.
Fig. 4 is a horizontal section of the lock taken on line x, Fig. 2.
Similar letters of reference indicate corresponding parts:
A and A' represent two sliding doors which are to be locked together. The
door A' is provided with a suitable horizontal recess B, over the edge of which is
screwed the striker C provided with the opening C' having the extension or curved
recess Con one side of its edge, as shown in Fig. 3. The door A is provided
with the lock, which comprises the main body or case D provided with, say, five
pin-chambers E occupied by the driving pins e e¹ operated by springs in the usual
manner. F is the cylinder provided with the pin holes H containing the pins /
constructed as usual. I is the key. This cylinder has cut upon its periphery
a spiral groove K which makes one complete circuit of the cylinder. A screw L
extends from the case D into said spiral groove. The cylinder is provided on its
periphery next its inner end with an engaging pin P.
In operation, the key I is inserted and turned, with the effect of rotating the
cylinder. The screw L, by its engagement in the spiral groove K causes the
cylinder, when it is rotated, to advance into the recess B in the door A¹.
As it
thus rotatively advances, the engaging pin P passes spirally through the extension
or recess C in the edge of the hole C'. When the cylinder has sufficiently
rotated, therefore, the driving pins E have locked it by dropping into the pin-holes H
in the ordinary manner, and the cylinder-which acts as a bolt-is locked in
the recess by said pins and by the pin P, so that the doors A A' are firmly locked
together.
The two outer driving pins e¹ do not act as locks when the cylinder has been
turned into the door A', and hence are provided with shoulders ell so that they will
not drop as do the pins e, but can yield to the upward pressure of the corresponding
pins in the cyliuder as the key is inserted. Of course a reverse rotation of the
cylinder withdraws it from the recess B in the door A¹.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :
1. In a lock of the character described, the combination of the rotative cylinder F

page_text: adapted to be operated by means of a key I and provided with the pin holes H,
pins and peripheral spiral groove K, the case D provided with the pin chambers E
and driving pins e e¹ said driving pins el being provided with shoulders e", and the
engaging screw L extending from the case into said groove, all arranged and
constructed substantially as and for the purpose set forth.
2. In a lock of the character described, in combination, the cylinder F provided
with the spiral groove K and pin R, the casing or body of the lock provided with
the engaging screw L extending into said groove, and the striker C provided with
the opening C¹ having the extension or recess C, said striker being set over the
edge of a recess in the door which is to be locked to that provided with the lock
itself, substantially as described.
Dated this 13th day of February 1895.
AUGUST LÜBBE.
WILLIAM JOSEPH KEATING.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.