U.S. patent number 3,680,337 [Application Number 05/122,320] was granted by the patent office on 1972-08-01 for safety lock.
Invention is credited to Edwin G. Krakauer.
United States Patent |
3,680,337 |
Krakauer |
August 1, 1972 |
SAFETY LOCK
Abstract
The lock casing employs a key-operated cylinder having
tumbler-receiving passages in line with spring-engaged tumblers in
the casing for the cylinder. When unlocking by a key, the latter
moves the tumblers into inoperative position, as customary. To
prevent "picking" of the lock, a key-receiving turn button is
pivotally held on the casing, and when the turn button-is moved
into key-slot exposed position, said movement effects locking of
the cylinder. It is only when the turn button abuts the key-opening
of the cylinder that the latter can be turned by the key to unlock.
Thus when the key-hole of the cylinder is exposed the cylinder is
held inoperative.
Inventors: |
Krakauer; Edwin G. (Long
Island, NY) |
Family
ID: |
22402023 |
Appl.
No.: |
05/122,320 |
Filed: |
March 9, 1971 |
Current U.S.
Class: |
70/419;
70/455 |
Current CPC
Class: |
E05B
17/14 (20130101); Y10T 70/8649 (20150401); Y10T
70/7932 (20150401) |
Current International
Class: |
E05B
17/14 (20060101); E05B 17/00 (20060101); E05b
017/18 () |
Field of
Search: |
;70/419,420,421,455 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Craig, Jr.; Albert G.
Claims
Having described my invention, what I claim and desire to secure by
Letters Patent, is as follows:
1. In a safety lock comprising a casing having tumbler-receiving
passages, a key-operated cylinder having a key-receiving passage
and tumbler-receiving passages, tumblers intermediate the casing
and cylinder and in register with said receiving passages, of a
turn button, means pivotally connecting said turn button to the
casing whereby said turn button is adapted to block or expose the
key-receiving passage of the cylinder, a cylinder lock member
engaged by the turn button and adapted to engage the cylinder for
locking the same against rotation when the turn button is pivotally
moved from a position in which it blocks insertion of an object
into the key-receiving passage of the cylinder, and means for
holding the turn button for its rotation.
2. A safety lock constructed in accordance with 1, in which the
cylinder is formed with a slot; the cylinder lock member being
finger-like and pivotally mounted in such manner as to enter said
slot of the cylinder by engagement of the turn button on the
raising of the latter from a position blocking the key-receiving
aperture of the cylinder.
Description
The invention will be described with reference to the accompanying
drawings, in which:
FIG. 1 is a side elevation, partly in section and partly in dotted
lines, illustrating an embodiment of the invention, the section
being on the line 1--1, FIG. 2.
FIG. 2 is a front-end elevation of the structure shown in FIG.
1.
FIG. 3 is a view similar to that of FIG. 1, with the turn Button in
key-receiving position.
FIG. 4 is a front-end elevation of the structure in its position
shown in FIG. 3.
Referring to the drawings, it will be seen that the embodiment
shown comprises a barrel-like casing 1, in which is rotatably
mounted a cylinder 2 formed with a row of apertures which receive
tumbler pins 3. Adapted to be aligned with the tumbler pins by
rotation of the cylinder is a row of tumblers 4 in apertures of the
casing, the said tumblers 4 being engaged by pressure springs 5. As
shown in FIG. 1 the cylinder 2 is formed with a key-receiving slot
for receiving a key, such as indicated at 6.
At 7 is shown one form of a turnbutton, and which has an internal
passage to closely receive the head of the key 6, and as indicated
at 7.sup.x, FIG. 1. At its front the casing is provided with two
spaced relatively heavy lugs 8 which receive between them a
cylinder-engaging combination lock and turn button carrier 10, the
latter being integral with a ring 11 seated in an annular channel
of the turn button 7. As shown by comparison of FIG. 1 with FIG. 3,
it will be seen that when the turn button is raised, to expose the
keyhole, carrier 10 has been swung downward in a slot 10.sup.x and
which continues into the cylinder itself, thus locking the cylinder
against rotation.. Thus in the position of the elements shown in
FIG. 3 the key can be inserted into the cylinder but it cannot turn
the cylinder until the turn button has been brought to the position
of FIG. 1, and the key-head is received in its seat within the turn
button.
After a door is locked with the device, the turn button can be
swung into position for freeing the key-head, and the key can be
removed. However, the lock cannot be picked because an adequate
movement of the turn button to expose the key-slot will cause
member 10 to lock the cylinder against rotation.
It will be understood that various modifications can be made in the
form and positioning of the elements shown in the illustrated
embodiment, within the spirit of the following claims.
* * * * *