Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02267040 1999-03-26
TAMPER RESISTANT HASP
This invention relates to a tamper resistant hasp for connecting a door
to an adjacent member for locking the door in a closed position.
BACKGROUND OF THE INVENTION
Conventionally a hasp is arranged for connection between an edge of
a door and an adjacent member for holding the door in a locked position, and
comprises a first mounting plate member for attachment to one of the door and
the
member; second mounting plate member for attachment to the other of the door
and the member; a link bar mounted on the first mounting plate member for
movement between a lock position overlying the second mounting plate member
and a release position spaced from the second mounting plate member; a lock
hanger mounted on the second mounting plate member so as to extend in a
direction substantially at right angles to the link bar when the link bar is
in the lock
position; the lock hanger being shaped such that an end portion thereof passes
through an opening in the link bar when in the lock position, the end portion
of the
lock hanger having a hole for receiving a padlock.
In some cases the first mounting member can be mounted on the door
and the second on an adjacent surface or vice versa. The adjacent surface can
comprise a fixed post or another pivotal door.
This type of hasp is open to attempts to force the padlock from the
door to gain forced entry either by applying vertical blows downwardly onto
the
padlock or by applying a lever under the padlock.
Attempts to reduce tampering are shown in US Patents 3,572,062
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(Beebe) issued Mar 23~d 1971; 3,736,016 (Garvey) issued May 29th 1973;
3,727,438
(Knack) issued April 17t" 1973 and 3,590,607 (Beaver) issued July 6th 1971.
However none of these provide an arrangement which is fully satisfactory in
reducing the above types of tampering.
SI~MMARY OF THE INVENTION
It is one object of the invention therefore to provide an improved hasp
which will inhibit tampering.
According to one aspect of the invention there is provided a hasp for
connection between an edge of a door and an adjacent member for holding the
door
in a locked position, the hasp comprising:
a first mounting plate member for attachment to one of the door and
the member;
a second mounting plate member for attachment to the other of the
door and the member;
a link bar having an inner end mounted on the first mounting plate
member for pivotal movement relative thereto between a lock position in which
an
outer end overlies the second mounting plate member and a release position in
which the outer end is spaced from the second mounting plate member , the link
bar
defining a longitudinal direction thereof extending from the inner end to the
outer end
and a transverse direction at right angles to the longitudinal direction;
a lock hanger mounted on the second mounting plate member so as to
extend in a direction substantially at right angles to the link bar when the
link bar is in
the lock position;
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the lock hanger being shaped such that an end portion thereof passes
through an opening in the link bar when in the lock position, the end portion
of the
lock hanger having a hole for receiving a padlock;
the link bar having mounted thereon a cover portion for engaging over
the padlock in the lock position, the cover portion comprising:
a peripheral wall portion having two parallel side edges each
attached to the link bar at longitudinally spaced positions therealong and
each
extending transversely to the link bar, the peripheral wall portion defining a
part
between the side edges which is spaced away from the link bar so as to
substantially surround the padlock and a bottom of the peripheral wall portion
which
is open for accessing the padlock;
and a substantially flat top wall portion having a straight top
edge extending longitudinally of the link bar between the side edges of the
peripheral wall portion and attached to the link bar, the flat top wall
portion being
inclined from the top edge in a direction extending outwardly from and
transversely
to the link bar to a peripheral edge connected to the peripheral wall portion
such that
an impact from an impact tool in a direction transverse to the link bar tends
to slip off
the top wall portion away from the link bar to prevent a direct impact on the
padlock.
Preferably the peripheral wall is defined by an integral strip.
Preferably the peripheral wall is arched between the side edges
thereof.
Preferably there is provided a triangular stiffening wedge on an
underside of the flat top wall portion with one side attached to the top wall
portion
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and a second side attached to the link bar so as to extend at transversely to
the link
bar and at right angles to the top plate.
Preferably the top wall portion has the peripheral edge thereof welded
to an edge of the peripheral wall portion.
Preferably the link bar is mounted on the first mounting plate member
for pivotal movement relative thereto about an axis parallel to the edge of
the door
and transverse to the link bar.
Preferably the first mounting plate member includes two plate portions
above and below respectively the link bar and a mounting rod welded across the
two
plate portions on which the link bar is mounted for said pivotal movement.
Preferably the second mounting plate member includes an attachment
mounting plate and an adjustable spacer plate parallel to the attachment
mounting
plate with the lock hanger mounted on the spacer plate, and adjustable
mounting
pins mounting the spacer plate on the attachment mounting plate with the
mounting
pins extending at right angles to the spacer plate and to the attachment
mounting
plate and being adjustable to increase and decrease a length thereof such that
the
distance between the mounting plate and the spacer plate is adjustable so as
to
adjust a length of a portion of the lock hanger which projects through the
link bar.
Preferably the attachment mounting plate is arranged for mounting on
an inside surface with the spacer plate arranged at a position spaced inwardly
from
the attachment mounting plate and the lock hanger projection from the spacer
plate
through the attachment mounting plate to the link bar on the outside surface.
Preferably the attachment mounting plate is longer than the spacer
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plate so as to provide mounting areas above and below the spacer plate.
According to a second aspect of the invention there is provided a hasp
for connection between an edge of a door and an adjacent member for holding
the
door in a locked position, the hasp comprising:
5 a first mounting plate member for attachment to one of the door and
the member;
a second mounting plate member for attachment to the other of the
door and the member;
a link bar having an inner end mounted on the first mounting plate
member for pivotal movement relative thereto between a lock position in which
an
outer end overlies the second mounting plate member and a release position in
which the outer end is spaced from the second mounting plate member;
a lock hanger mounted on the second mounting plate member so as to
extend in a direction substantially at right angles to the link bar when the
link bar is in
the lock position;
the lock hanger being shaped such that an end portion thereof passes
through an opening in the link bar when in the lock position, the end portion
of the
lock hanger having a hole for receiving a padlock;
the second mounting plate member including an attachment mounting
plate and an adjustable spacer plate parallel to the attachment mounting plate
with
the lock hanger mounted on the spacer plate, and adjustable mounting pins
mounting the spacer plate on the attachment mounting plate with the mounting
pins
extending at right angles to the spacer plate and to the attachment mounting
plate
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and being adjustable to increase and decrease a length thereof such that the
distance between the mounting plate and the spacer plate is adjustable so as
to
adjust a length of a portion of the lock hanger which projects through the
link bar.
One embodiment of the invention will now be described in conjunction
with the accompanying drawings in which:
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a front elevational view of the hasp in the closed position.
Figure 2 is a front elevational view of the hasp in the open position.
Figure 3 is a vertical cross section of the hasp along the lines 1 -1
Figure 4 is an isometric view of the hasp in Figure 1.
Figure 5 is an top plan view of the hasp in Figure 1.
Figure 6 is a rear elevational view of a part only of the hasp in Figure 1.
In the drawings like characters of reference indicate corresponding
parts in the different figures.
DETAILED DESCRIPTION
A lock device 1 comprises a back reinforcement plate 3 which is fixed
to a door by a plurality of support bolts 7 and fastened by nuts 9. The back
reinforcement plate 3 is parallel to with the door 5. A spacer plate 11 of
rectangular
shape with the first sides 3A of the reinforcement plate 3 being longer than
the
second sides 3B of the reinforcement plate 3, is fastened to the door by two
adjustment bolts 13 and two adjustment nuts 15. The adjustment bolts 13 are of
equal distance from the first side 3A and equal distance from the second sides
3B.
Spacers 17 are placed between to spacer plate 11 and the door 5 on the
adjustment
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bolts 13.
A lock holder 19 shaped so that it passes through an opening in the
link bar 37 when in the lock position extending forwardly in a horizontal
direction
though the door 5. Spacers 17 are placed in their respective positions to
ensure that
the lock holder 19 is in the proper position.
Located at the furthermost end of the lock holder is a circular hole 21 in
which the hook of a lock is inserted. To provide maximum security the spacers
17
are added or taken out to keep the lock holder tight to the door, preventing
instruments being wedged between the hasp 1 and the door 5.
Protecting the lock from being tampered with is a cover 23. The cover
consists of a inclined cap 25 and a main cover portion 27. A pivotal flap 29
which is
positioned flush with the door 5. The inclined cap 25 extends outwardly and
downward from the furthermost top end of the pivotal flap 29 to the main cover
portion 27 and is inclined to deflect hammer blows. Attached to the forward
most
end of the inclined cap 25 is the main cover portion 27 which forms a
peripheral wall
substantially surrounding the padlock. The cover 23 is shaped to form a
circular
tube which has an open end 31 for hand access to the hold portion 21 for
attaching
and protecting the lock.
A triangle support member 33 is attached to the inside wall of the
inclined cap 25, to the pivotal flap 29 and to a disc member 35 to add extra
support
for the hasp 1.
The pivotal flap 29 and the cover 23 consist of a link arm 37 which is
parallel to the door 5 when in the closed position and extends horizontally
and is
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circular shaped at the end 41 to create a hinge 39. The circular end 41
surrounded
a hinge bar 43 and is secured with a weld joint 45.
The hinge bar 43 is attached to two front plates 47A and 47B. The first
front plate 47A is located above the hinge 39 and the second front plate 47B
is
located below the hinge 39. The front plates are fixed to the second door 5A
by a
back plate 47C. The back plate are large in size to spread any force exerted
on the
outside of the hasp 1 over a large area of the inside of the door 5A
preventing the
looking system 1 from being pried or hammered off.
Since various modifications can be made in my invention as herein
above described, and many apparently widely different embodiments of same made
within the spirit and scope of the claims without department from such spirit
and
scope, it is intended that all matter contained in the accompanying
specification shall
be interpreted as illustrative only and not in a limiting sense.
