IES83659Y1 - A ladder clamp - Google Patents
A ladder clampInfo
- Publication number
- IES83659Y1 IES83659Y1 IE2004/0309A IE20040309A IES83659Y1 IE S83659 Y1 IES83659 Y1 IE S83659Y1 IE 2004/0309 A IE2004/0309 A IE 2004/0309A IE 20040309 A IE20040309 A IE 20040309A IE S83659 Y1 IES83659 Y1 IE S83659Y1
- Authority
- IE
- Ireland
- Prior art keywords
- clamp
- ladder
- driving rod
- securing
- clamping head
- Prior art date
Links
- 210000003128 Head Anatomy 0.000 description 40
- 238000010276 construction Methods 0.000 description 7
- 210000003195 Fascia Anatomy 0.000 description 4
- 230000000087 stabilizing Effects 0.000 description 4
- 230000000284 resting Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000003811 Fingers Anatomy 0.000 description 1
- 102000012152 Securin Human genes 0.000 description 1
- 108010061477 Securin Proteins 0.000 description 1
- 210000003813 Thumb Anatomy 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000881 depressing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000789 fastener Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002965 rope Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
ABSTRACT A ladder clamp (1) comprises a securing clamp (3) for mounting fast on a ladder and a structure-engaging clamp (5) connected to the securing clamp for securing the ladder clamp to a portion of a structure. The structure engaging clamp further comprises a substantially c—shaped bracket (7) and a driving rod (19) slidable within a bore on the c—shaped bracket. A driven ratchet mechanism (21) is located between the driving rod and the c—shaped bracket for urging the driving rod towards a fixed clamping head (15) mounted on the c—shaped bracket and there is additionally provided a quick release locking means (23) to release the driven ratchet mechanism. The ladder clamp may thus be connected and disconnected in a quick and secure manner.
Description
Introduction
The present invention relates to a ladder clamp comprising a securing clamp for mounting
fast on a ladder and a structure engaging clamp connected to the securing clamp for
securing the ladder clamp to a portion of a structure.
One of the main problems with ladders is their general instability. One of the most
frequent causes of accidents involving ladders is caused by side slippage of the ladder.
This side slippage is often caused by overreaching of an individual when they are up the
ladder thereby causing the ladder to tilt to one side. It is known, for example, to provide
struts and the like to support a ladder on the ground and indeed in many situations it is
considered good practice to in some way bind the ladder to the structure against which it
is resting. In order to bind the ladder to a structure, a rope or other similar item must be
anchored to both the ladder and the structure. Typically though, the ladder will be resting
against a window sill, parapet wall, gutter or other such type of structure and it is
virtually impossible to securely fasten the ladder to any of these structures simply by
tying the ladder to the structure.
Various devices have been proposed in order to overcome the difficulties with the known
methods of securing the ladder to a structure. One such device is that described in
GB61026l (Gilbert). This patent application describes a ladder clamp that may be used to
prevent side slippage of a ladder when the ladder is resting against a gutter. The ladder
clamp is first of all mounted onto a gutter by tightening a clamping screw to secure the
ladder clamp to the gutter before an angularly bent rod connected to the ladder clamp is
secured around a side of the ladder. The angularly bent rod is secured in place by
adjusting a pair of hand nuts until the rod is in the desired position. A problem with this
type of clamp is that a user must then tighten both the clamping screw and the pair of
hand nuts in order to secure the ladder in position. This can be a relatively cumbersome
and time consuming procedure which is undesirable particularly when the user of the
device may be several feet above ground when attempting to fix the ladder clamp in
position. Furthermore, a significant amount of time must be spent in order to release the
ladder clamp from the gutter which could be spent on other activities.
Another known device is that described in GB137889 (Henson). This patent application
describes a device that helps prevent sideways slippage of a ladder. A bracket is placed
around one side of a ladder before the bracket is attached to a gutter or the like by a twist
screw. There are however, problems with this type of clamp. First of all, by using a twist
screw to fasten the clamp to the gutter the user will be limited in how tightly they can
attach the clamp to the gutter and the speed in which the clamp may be connected and
more particularly disconnected from the gutter will be limited. In addition to this the
clamp will be relatively cumbersome to operate and is limited in the number of objects
that it may be used to secure the ladder to.
It is an object therefore of the present invention to provide a ladder clamp that overcomes
at least some of these difficulties that is both simple and efficient to operate. It is a further
object of the present invention to provide a ladder clamp that is flexible in use that may
be used to secure the ladder to a variety of different structures.
Statements of Invention
According to the invention there is provided a ladder clamp comprising a securing clamp
for mounting fast on a ladder and a structure engaging clamp connected to the securing
clamp for securing the ladder clamp to a portion of a structure characterised in that the
structure engaging clamp comprises:
(a) a substantially c-shaped bracket having a body portion bridging a pair of
outwardly projecting arms;
(b) a fixed clamping head mounted adjacent the free end of one of the arms
and a movable clamping head mounted on a driving rod, the driving rod
being slidable within a bore in the other arm for movement towards and
away from the fixed clamping head; and
(c) a driven ratchet mechanism between the driving rod and the c-shaped
bracket for urging the driving rod and hence the movable clamping head
towards the fixed clamping head for engagement of a structure
therebetween and a quick release locking means to allow disengagement
of the ratchet and hence disengagement of the movable clamping head.
By having such a ladder clamp the ladder clamp may be secured to a portion of a
structure in a matter of seconds. The driven ratchet mechanism will allow the user to
tighten the clamp around the structure in a quick and efficient manner so that the user of
the device will not have to spend time adjusting twist screws and the like. This is seen as
highly advantageous. In addition to this, the user of the device will only need one hand in
order to tighten the ladder clamp around the portion of the structure thereby allowing
them to keep their other hand on the ladder which will help to prevent any accidents that
may occur. Another advantage of the ladder clamp is that the driven ratchet mechanism
may be released quickly in order to free the ladder clamp from the structure thereby
facilitating the use of the device, particularly if the ladder is being moved frequently as
the time saved by the user will be significant.
In another embodiment of the invention there is provided a ladder clamp in which the
quick release locking means further comprises a locking plate having a through bore for
reception of the driving rod, the locking plate being tiltable relative the driving rod to and
from a locking configuration and a release configuration and a resilient biasing member
for urging the locking plate into a locking configuration. This is seen as a particularly
simple construction of quick release locking means that will be simple and cost efficient
to manufacture. Furthermore, this type of locking means will allow the ladder clamp to be
released from the portion of the structure in a very quick manner which will greatly
facilitate the use of the device.
In one embodiment of the invention there is provided a ladder clamp in which the driven
ratchet mechanism further comprises a driving plate having a through bore for reception
of the driving rod, and a trigger pivotally mounted intermediate its ends on the structure
engaging clamp, one end of the trigger being in engagement with the driving plate, the
driving plate being tiltable to and from a driving configuration in which the driving plate
grips the driving rod and causes the driving rod to move towards the fixed clamping head
and a release configuration in which the driving plate is able to move relative the driving
rod, the driving plate being tiltable on actuation of the trigger. Again, this is seen as a
very simple construction of driven ratchet mechanism that will be simple and cost
efficient to manufacture. In addition to this the mechanism can be easily operated by the
user even when the user has only one hand available to operate the mechanism.
In a further embodiment of the invention there is provided a ladder clamp in which there
is provided a resilient biasing member acting on the driving plate, urging the driving plate
into a release configuration. By having the resilient biasing member acting on the driving
plate, the biasing member will in turn act on the trigger which will be returned to a rest
position ready for operation and further tightening of the clamp. This will facilitate the
operation of the trigger and the ladder clamp.
In another embodiment of the invention there is provided a ladder clamp in which there
are provided a pair of securing clamps connected to the structure engaging clamp, one of
the securing clamps being located on one side of the structure engaging clamp and the
other securing clamp being located on the other side of the structure engaging clamp. In
this way the ladder clamp will be extremely flexible and the user of the ladder clamp will
be able to connect the ladder clamp on either side of the ladder. The user will not then be
limited in the position that they must arrange the ladder and will be able to place the
ladder clamp on either of the side portions of a ladder. This is seen as particularly useful.
In one embodiment of the invention there is provided a ladder clamp in which the
securing clamp is rotatably mounted with respect to the structure engaging clamp. This is
also seen as highly useful as the ladder clamp will be able to be secured to the ladder
regardless of the orientation of the ladder with respect to the wall and regardless of the
orientation of the portion of the structure to which the ladder clamp is to be secured. It is
envisaged that this will also facilitate a good engagement between the ladder clamp and
the ladder each time the ladder clamp is secured around the ladder.
In a further embodiment of the invention there is provided a ladder clamp in which the
securing clamp further comprises a substantially U-shaped bracket having a locking
member for securing the securing clamp to the ladder. This is seen as a good
configuration of securing clamp as the securing clamp may be installed around the ladder
in the shortest possible time while at the same time still permitting a good connection
between the securing clamp and the ladder. It is envisaged that the locking member may
comprise a twist screw for bearing against a side of the ladder. The twist screw will
provide a secure connection between the securing clamp and the ladder. Alternatively, the
locking member may comprise a strap connected at one end to the ladder clamp and its
other end being securable in a strap fastener mounted on the securing clamp. In this way
the strap could be fastened around the ladder in a quick and simple manner thereby
securing the ladder clamp in position.
In another embodiment of the invention there is provided a ladder clamp in which the
movable clamping head is pivotally mounted on the driving rod. In this way the ladder
clamp will be flexible in use in that it may be attached to a variety of different shaped
walls, window sills and other similar structures as the clamping head may pivot to match
the orientation of the portion of structure to which it is being connected. This will enable
the ladder clamp to provide a secure connection with practically any structure to which it
is introduced. In addition to this, the fixed clamping head may also be pivotally mounted
adjacent the free end of the arm. It is envisaged that the movable clamping head and the
fixed clamping head may be mounted by way of a ball and socket joint or by way of a
universal joint.
In one embodiment of the invention there is provided a ladder clamp in which the
clamping heads are provided with a non-slip coating.
In a further embodiment of the invention there is provided a ladder clamp in which the
clamping heads are substantially arcuate in cross-section, the open mouth of each of the
clamping heads facing the open mouth of the other clamping head. In this way the ladder
clamp may be used to secure the ladder clamp to scaffolding or piping and the like in a
very secure fashion. Alternatively, the clamping heads may be substantially semi-circular
in cross-section. Furthermore, at least one of the clamping heads could be substantially L-
shaped in cross-section. This could facilitate the connection of the ladder clamp to angled
sections.
In another embodiment of the invention there is provided a ladder clamp in which there is
provided at least one stabilizing strut protruding outwardly from the C—shaped bracket in
substantially the same direction as the securing clamp for engaging the outer face of the
side of the ladder upon which the ladder clamp is mounted. By having such a strut the
ladder clamp will be even further stabilized against sideways motion as the strut will also
act on the side of the ladder thereby spreading the load between the strut and the securing
clamp.
Detailed Description of the Invention
The invention will now be more clearly understood from the following description of
some embodiments thereof given by way of example only with reference to the
accompanying drawings in which:-
Figure 1 is a rear perspective View of a ladder clamp according to the present
invention;
Figure 2 is a left hand side view ofthe ladder clamp shown in Figure 1;
Figure 3 is a right hand side View of the ladder clamp shown in Figure 1;
Figure 4 is a rear perspective view of an alternative construction of ladder clamp
according to the invention;
Figure 5 is a rear perspective view of another alternative construction of ladder
clamp according to the invention;
Figure 6 is an enlarged View of the movable clamping head used with the ladder
clamp according to the invention;
Figure 7 is a right hand side view of a ladder clamp according to the invention in
use with the ladder clamp secured to a ladder and a window sill, the ladder being
shown in ghost; and
Figure 8 is a right hand side view of a ladder clamp according to the invention in
use with the ladder clamp secured to a ladder and a fascia board, the ladder being
shown in ghost.
Referring to the drawings and initially to Figures 1 to 3 thereof, there is shown a ladder
clamp, indicated generally by the reference numeral 1, comprising a securing clamp 3 for
mounting fast on a ladder (not shown), and a structure engaging clamp 5 connected to the
securing clamp for securing the ladder to a portion of a structure. The structure engaging
clamp 5 comprises a substantially c—shaped bracket 7 having a body portion 9 bridging a
pair of outwardly projecting arms 1], 13. A fixed clamping head 15 is mounted adjacent
the free end of one of the arms 13 and a movable clamping head 17 is mounted on a
driving rod 19 which in turn is slidable within a bore in the other arm 1 l for movement
towards and away from the fixed clamping head 15. A driven ratchet mechanism 21 is
provided between the driving rod 19 and the c—shaped bracket 7 for urging the driving rod
19 and hence the movable clamping head 17 towards the fixed clamping head 15 and a
quick release locking means 23 is provided to allow disengagement of the driven ratchet
mechanism 21 and hence disengagement of the movable clamping head 17.
The driven ratchet mechanism 21 comprises a driving plate 25 having a through bore (not
shown) for reception of the driving rod l9. The through bore is marginally larger in
circumference than the driving rod 19 so that the driving plate 25 is able to tilt relative the
driving rod 19 to and from a driving configuration and a release configuration. A trigger
27 is pivotally mounted intermediate its ends about pivot point 29 on the structure
engaging clamp. One end of the trigger is held in engagement with the driving plate 25. A
resilient biasing member, provided by way of helical spring 31 urges the driving plate to
a position substantially orthogonal to the driving rod 19. There is additionally provided a
handle 28 connected to the c-shaped bracket to be gripped by the user.
The quick release locking means 23 comprises a locking plate 33 having a through bore
for engagement of the driving rod. The through bore 35 is marginally larger in
circumference than the driving rod 19 so that the locking plate is tiltable relative the
driving rod to and from a locking configuration in which the locking plate is offset from
the orthogonal to the main axis of the driving rod and a release configuration in which the
locking plate is substantially orthogonal to the main axis of the driving rod 19. A resilient
biasing member, provided by helical spring 37 is provided to urge the locking plate into a
locking configuration.
Finally, the securing clamp 3 comprises a substantially u—shaped bracket 39 having a
locking member provided by an elongate threaded twist lock 41. A knob 43 is provided
for manipulating the threaded twist lock 41 at one end of the threaded twist lock and an
abutment 45 is mounted on the other end of the threaded twist lock 41 for engagement of
the side of the ladder. The securing clamp is connected to the structure engaging clamp
by way of cross bar 47. The securing clamp is rotatably mounted about the cross bar 47
so that it can rotate through 360°.
In use, the operator of the device ascends the ladder and places the structure engaging
clamp around the portion of the structure to which it is to be connected. Once the
approximate position for the ladder engaging clamp has been determined, the operator
secures the securing clamp 3 to the ladder by placing the u—shaped securing bracket
around one side of the ladder and then twisting the knob 43of the threaded twist lock until
the abutment 45 comes into contact with the side of the ladder. The knob 43 is twisted
until the ladder is securely fastened between the abutment 45 and the u—shaped bracket
39. Once the securing clamp has been fastened to the side of the ladder the operator opens
the structure engaging clamp to its maximum extension by depressing the locking plate
33 against the spring 37 and pulling the driving rod upwards by a knob 49 attached to the
end of the driving rod 19 remote from the fixed clamping head until the fixed clamping
head 15 and the movable clamping head 17 are at their maximum separation. The
operator then rotates the structure engaging clamp until the portion of the structure upon
which the structure engaging clamp is to be connected to lies between the fixed and the
movable clamping heads. Once in position, the operator simultaneously grips the handle
28 and the trigger 27 and squeezes the trigger 27 towards the handle 28. This movement
of the trigger 27 causes the end of the trigger in contact with the driving plate 25 to push
the driving plate downwards. When moved in such a fashion, the driving plate 25 at first
will tilt to a driving position in which the driving plate is offset from the orthogonal to the
main axis of the driving rod l9. In doing so the driving plate 25 grips the driving rod 19
and further motion of the trigger 27 causes the driving plate and the gripped driving rod
to be pushed downwards. This is turn causes the movable clamping head 17 to approach
the fixed clamping head 15 thereby securing the portion of the structure therebetween.
The trigger 27 may have to be squeezed and released a number of times depending on the
distance between the fixed and movable clamping heads 15, 17 and the size of the portion
to which the clamp is being connected to.
The quick release locking means 23 is such that the locking plate 33 permits movement
of the driving rod in the direction towards the fixed clamping head 15. Movement in the
opposite direction however is prevented by the locking plate which is urged into a
locking configuration by the spring 37. When the driving rod is urged in the direction of
the fixed clamping head by the driven ratchet mechanism, the driving rod l9 acts against
the locking plate 33 and hence the spring 37 and pushes the locking plate marginally
downwards so that the driving rod is allowed to pass through the locking plate. Any
attempt at movement ofthe driving rod 19 in the direction away from the fixed clamping
head 15 however will cause the locking plate to be pushed upwards into a locking
configuration thereby tightening the grip of the locking plate on the driving rod 19
thereby preventing movement of the driving rod in that direction. In order to disengage
the driven ratchet mechanism and hence the movable clamping head 17 so that the ladder
clamp may be removed from the structure, all the operator has to do is to urge the locking
plate 33 downwards against the spring 37 with their thumb or finger so that the locking
plate is substantially orthogonal to the main axis of the driving rod. In this configuration
the driving rod 19 may be pulled upwards by knob 49 thereby separating the fixed and
movable clamping heads and allowing the ladder clamp to be removed from the structure
to which it has been attached.
Referring to Figure 4 of the drawings there is shown an alternative construction of ladder
clamp according to the invention where like parts have been given the same reference
numerals as before. The ladder clamp further comprises a second securing clamp 51
mounted on the opposite side of the c-shaped bracket to the first securin g clamp 3. The
second securing clamp is also provided with a threaded twist lock 53 having a knob 55
mounted on one end thereof and an abutment (not shown) mounted on the other end
thereof for engagement of the side of a ladder. In this way, the ladder clamp may be
easily fitted onto either side ofthe ladder depending on which is desirable to the user.
Referring to Figure 5 of the drawings there is shown another alternative construction of
ladder clamp according to the invention where like parts have been given the same
reference numerals as before. The ladder clamp further comprises a pair of stabilizing
struts 65, 67, mounted on the c-shaped bracket, each of which protrudes outwardly from
the c-shaped bracket in substantially the same direction as one of the pair of securing
clamps 3, 51. The stabilizing struts 65, 67 are arranged to protrude outwardly from the c-
shaped bracket by substantially the same distance as the cross bar 47 so that when the
securing clamp is fastened to a ladder the stabilizing strut on the same side of the c-
shaped bracket as the securing clamp connected to the ladder abuts against the outer face
of the side of the ladder upon which the securing clamp is mounted. In this way, the
ladder clamp will be further stabilized against any sideways movement.
Referring to Figure 6 of the drawings there is shown an enlarged view of the movable
clamping head 17. The clamping head is pivotally mounted on the driving rod 19, only
part of which is shown for reasons of clarity. The movable clamping head 17 is allowed
to pivot about cross bar 59. Preferably the entire clamping head is constructed from a
non-slip substance such as rubber. It is envisaged however that only a structure engaging
face 61 could be covered in a non-slip material. Furthermore, it is envisaged that the fixed
clamping head could be pivotally mounted in the same manner.
Referring to Figures 7 and 8 of the drawings, there are shown a pair of views in which the
ladder clamp as shown in Figures 1 to 3 is shown in operation attached to both a ladder
and a portion of a structure with the ladder shown in ghost for reasons of clarity.
Referring specifically to Figure 7 of the drawings, the ladder clamp is shown attached to
both a ladder 71 and a concrete window sill 73 formed on the side wall 75 ofa building.
The ladder clamp l secures the ladder 71 in position relative the window sill 73 and
sideways slippage of the ladder is obviated. Referring specifically to Figure 8 there is
shown a ladder clamp 1 attached to both a ladder 7l and a fascia board 8] of a roof 83 of
a building 85. Again, by securing the ladder to the fascia board in this manner the ladder
will not be prone to slipping sideways. Furthermore, it can be seen that the ladder clamp
may be connected to a variety of different structures including gutters, parapet walls,
window sills, fascia boards and other such structures. It can be seen that the structure
engaging clamp 5 shown in Figure 8 is rotated by 90° with respect to the orientation of
the structure engaging clamp 5 shown in Figure 7. The ladder clamp l is constructed so
that the securing clamp and the structure engaging clamp are rotatable with respect to
each other, therefore the clamp may be used to clamp onto a variety of different
structures in a variety of different orientations making the ladder clamp flexible in its
application.
ln this specification the terms “comprise, comprises, comprised and comprising” andithe
terms “include, includes, included and including” are deemed totally interchangeable and
should be afforded the widest possible interpretation.
This invention is in no way limited to the embodiments hereinbefore described but may
be varied in both construction and detail within the scope of the claims.
Claims (1)
- Claims: A ladder clamp (1) comprising a securing clamp (3) for mounting fast on a ladder and a structure engaging clamp (5) connected to the securing clamp for securing the ladder clamp to a portion of a structure, the securing clamp (3) being rotatably mounted with respect to the structure engaging clamp (5) characterised in that the structure engaging clamp comprises: a substantially c-shaped bracket (7) having a body portion (9) bridging a pair of outwardly projecting arms (1 1, 13); a fixed clamping head (15) mounted adjacent the free end of one of the arms (13) and a movable clamping head (17) mounted on a driving rod (19), the driving rod being slidable within a bore in the other arm (1 1) for movement towards and away from the fixed clamping head (I 5); and a driven ratchet mechanism (21) between the driving rod and the c-shaped bracket (7) for urging the driving rod (19) and hence the movable clamping head (17) towards the fixed clamping head (15) for engagement of a structure therebetween and a quick release locking means (23) to allow disengagement of the ratchet and hence disengagement of the movable clamping head (17). A ladder clamp (l) as claimed in claim 1 in which the quick release locking means (23) further comprises a locking plate (33) having a through bore (35) for reception of the driving rod (19), the locking plate (33) being tiltable relative the driving rod to and from a locking configuration and a release configurationiand a resilient biasing member (37) for urging the locking plate (33) into a loflg configuration. K A ladder clamp (1) as claimed in claim ] or 2 in which the driven ratchet mechanism (21) further comprises a driving plate (25) having a through bore for reception of the driving rod (19), and a trigger (27) pivotally mounted intermediate its ends on the structure engaging clamp (5), one end of the trigger being in engagement with the driving plate (25), the driving plate being tiltable to and from a driving configuration in which the driving plate grips the driving rod and causes the driving rod to move towards the fixed clamping head and a release configuration in which the driving plate is able to move relative the driving rod, the driving plate being tiltable on actuation of the trigger and in which there is further provided a resilient biasing member (31) acting on the driving plate (25), urging the driving plate into a release configuration. A ladder clamp (1) as claimed in any preceding claim in which there are provided a pair of securing clamps (3) connected to the structure engaging clamp (5), one of the securing clamps being located on one side of the structure engaging clamp (5) and the other securing clamp being located on the other side of the structure engaging clamp. A ladder clamp (1) substantially as hereinbefore described with reference to and as illustrated by the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IEIRELAND01/05/2003S2003/0329 |
Publications (2)
Publication Number | Publication Date |
---|---|
IE20040309U1 IE20040309U1 (en) | 2004-11-03 |
IES83659Y1 true IES83659Y1 (en) | 2004-11-03 |
Family
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