U.S. patent number 3,901,057 [Application Number 05/465,888] was granted by the patent office on 1975-08-26 for padlock.
Invention is credited to Clifford L. Coley, Sr..
United States Patent |
3,901,057 |
Coley, Sr. |
August 26, 1975 |
Padlock
Abstract
An electromagnetic padlock including a detent normally holding a
padlock shackle in a locking position, a solenoid connected to said
detent for disengaging the detent from the shackle when the
solenoid is energized, and an energizing unit having a plug which
may be detachably connected to a jack, carried by the padlock case,
and which is electrically connected to the solenoid, for energizing
the solenoid when an electric current is supplied thereto from a
current source to which the energizing unit is connected. The
solenoid is capable of being energized for disengaging the detent
only when a voltage of a particular value is supplied thereto. The
energizing unit includes a transformer for changing the voltage
received from the current source to a voltage corresponding to that
required to energize the solenoid.
Inventors: |
Coley, Sr.; Clifford L.
(Byhalia, MS) |
Family
ID: |
23849577 |
Appl.
No.: |
05/465,888 |
Filed: |
May 1, 1974 |
Current U.S.
Class: |
70/20; 70/277;
70/DIG.46; 70/282 |
Current CPC
Class: |
E05B
47/00 (20130101); Y10T 70/7124 (20150401); E05B
67/00 (20130101); Y10T 70/7062 (20150401); Y10S
70/46 (20130101); Y10T 70/413 (20150401) |
Current International
Class: |
E05B
47/00 (20060101); E05B 67/00 (20060101); E05B
047/00 (); E05B 047/04 (); E05B 051/00 (); E05B
067/38 () |
Field of
Search: |
;70/20,277,278,280
;292/144 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gilliam; Paul R.
Assistant Examiner: Pietruszka; Carl F.
Attorney, Agent or Firm: Randolph; John N.
Claims
I claim as my invention:
1. A lock including a part movable between a locked an an unlocked
position, a detent engaging and normally retaining said part in a
locked position, a solenoid connected to said detent for moving the
detent out of engagement with said part when the solenoid is
energized, said solenoid being capable of being energized only by a
voltage of a particular value, an electrical conductor connecting
said solenoid to an electric current source, means interposed in
said conductor for changing the voltage of the current to the
particular voltage capable of energizing the solenoid, said
conductor having connector means at each end constituting parts of
an unlocking device which is normally detached from the lock, and
said lock having means electrically connected to the solenoid to
receive one of said connector means, said other connector means
being adapted to be removably connected to the current source.
2. A lock as in claim 1, said means comprising a transformer.
3. A lock as in claim 1, and a manually actuated normally open
switch interposed in said conductor and adapted to be manually
actuated for completing the circuit from the current source to the
solenoid.
4. A lock as in claim 1, said lock comprising a padlock, said part
comprising a slidably mounted shackle having one leg provided with
a notch, said detent comprising a hook having a bill for engaging
said notch, means pivotally mounting the hook in the padlock, and
said solenoid having a slidably mounted armature connected to the
hook for swinging the bill thereof out of engagement with said
notch when the solenoid is energized to retract the armature.
Description
BACKGROUND
The prior art discloses the use of an electric plug for supplying
current to a jack which is electrically connected to the solenoid
of a lock for supplying current through said plug and jack to the
solenoid to effect an unlocking of the lock. However, the prior art
does not disclose the concept of utilizing a transformer for
effecting a change in the voltage received from the current source
to that supplied to the solenoid.
SUMMARY
It is a primary object of the present invention to provide an
electrically actuated padlock which is especially adapted for use
on freight cars and large freight carrying trailers and which
utilizes an unlocking device for supplying an electric current to a
solenoid of the padlock to effect release of a detent, and wherein
the voltage of the current supplied to the solenoid differs from
the voltage received from the current source, so that the solenoid
cannot be energized to release the detent unless a prescribed
voltage is applied thereto, so that unlocking of the padlock can
only be accomplished with a particular unlocking device or
energizer capable of stepping the voltage either up or down to a
certain predetermined value.
Another object of the invention is to provide an energizer or
unlocking device utilizing a transformer for changing the voltage
from that supplied to the transformer to that transmitted
therefrom.
Various other objects and advantages of the invention will
hereinafter become more fully apparent from the following
description of the drawing, illustrating a presently preferred
embodiment thereof, and wherein:
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view showing the padlock in a locked
position;
FIG. 2 is a perspective view showing the padlock in an unlocked
position and with the unlocking device or energizer connected
thereto, and
FIG. 3 is a fragmentary plan view of the energizer or unlocking
device.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring more specifically to the drawing, a padlock designated
generally 5, of the electromagnetic type, is illustrated in FIGS. 1
and 2 and includes a case 6 having an end wall 7 provided with
spaced openings 8 to slidably receive the substantially parallel
legs 9 and 10 of a shackle 11. Sleeves 12 and 13 are secured to the
inner side of the wall 7 and are disposed within the hollow
interior of the case 6 in registration with the openings 8 to
slidably guide and reinforce the shackel legs 9 and 10
respectively. The sleeve 12 which guides the longer leg 9 is longer
than the sleeve 13; and said longer leg has an enlargement or
flange 14 at its inner end to engage the inner end of the sleeve 12
to limit the extent that the shackle 11 can be moved to its
projected, unlocked position of FIG. 2, under the biasing action of
a compression spring 15 which is disposed against the inner side of
the casing wall, located opposite the wall 7, and the adjacent side
of the enlargement 14.
The shorter leg 10 which is out of engagement with the case 6 in
the open position of the padlock 5, as seen in FIG. 2, can be swung
away from the case 6 about the leg 9 as an axis, for engaging the
shackle 11 with a hasp staple or chain links, not shown, as is
conventional, or for disengaging the shackle therefrom. The shackle
leg 10 has a notch 16 which faces away from the shackle leg 9 and
which has an outwardly facing shoulder 17. A detent 18, in the form
of a hook, is pivotally mounted within the case 6 by a pivot pin 19
which is supported by the case and which engages through an
intermediate portion of the shank of the hook. The hook 18 has a
bill 20 to engage the notch 16 and abut the shoulder 17, when the
shackle 11 is in its locked position of FIG. 1. A light compression
spring 21 which bears against a part of the interior of the case 6
and against the detent 18, opposite to the bill 20, urges the bill
20 into engagement with the notch 16 for locking the shackle leg 10
in the case 6.
A solenoid 22 is secured in the case 6 and has an armature 23 which
is pivotally connected to the detent 18, near the end thereof
disposed remote from the bill 20 and on the opposite side of the
pivot 19 to said bill 20. The spring 21 normally holds the armature
23 in its extended position of FIG. 1 when the solenoid 22 is
deenergized. In this position, the detent 18 abuts the stop 24
which limits the extent that said detent can be rocked on its pivot
19 under the biasing action of the spring 21.
A jack 25 is mounted in one wall of the case 6 and has three
conductor sleeves 26 supported thereby and opening through said
wall. Two of the sleeves 26 are connected by electrical conductors
27 to the solenoid 22 and the other sleeve 26 is grounded to the
case 6 by a conductor 28.
An unlocking device or energizing unit, designated generally 29,
includes a hollow handle 30 containing a transformer 31, which is
connected at one end by a three conductor cable 32 to a three prong
plug 33; and at its other end by a three conductor cable 34 to a
three prong plug 35. A pushbutton switch 36 is also mounted in the
handle 30 and is normally disposed in a circuit breaking
position.
The transformer 31 is capable of changing the voltage of the
electric current passing therethrough to a certain predetermined
voltage which is the only voltage which will energize the solenoid
22. The plug 33 is adapted to be connected to a conventional
electrical outlet, such as 110 volt outlet, or to a conventional
battery pack, not shown. The plug 35 is connected to the jack 25.
One prong of the plug 35 is only capable of engaging the sleeve 26
of the ground conductor 28. Thereafter, when the pushbutton switch
36 is depressed to close the circuit, voltage of a proper value
will be supplied through the unit 29 to the solenoid 22 for
energizing the solenoid to move the armature 23 thereof inwardly
from its position of FIG. 1 to its position of FIG. 2, for rocking
the detent 18 to its position of FIG. 2, for disengaging the bill
20 from the notch 16, so that the spring 15 can project the shackle
leg 10 from the case 6 and into the unlocked position of the
padlock 5, as seen in FIG. 2. Thereafter, and with the unit 29
disconnected from the padlock 5, said padlock can be returned to a
locked position in a conventional manner.
While the lock has been illustrated and described as a padlock, it
will be readily understood that the invention could be embodied in
other types of locks and with the unit 29 being utilized for
supplying electric current of a particular voltage to a solenoid to
effect movement of a detent or its equivalent of the lock to
accomplish the unlocking action.
Various other modifications and changes are contemplated and may be
resorted to, without departing from the function or scope of the
invention .
* * * * *