The present invention concerns rodent traps. More particularly, but not exclusively, the invention concerns rodent traps comprising a kill mechanism arranged to kill a rodent, and a storage area into which a rodent corpse passes after the rodent has been killed by the kill mechanism.
It is common for rodent traps to be checked only periodically, for example monthly. A downside of this is that rodents that have been caught can remain in the trap for a long period before being removed. This reduces the rate at which rodents can be caught by the trap, as until a rodent corpse has been removed and the trap reset, no further rodents will be caught. In addition, in the period before the rodent corpse is removed it can decompose, causing hygiene and odour issues.
The present invention seeks to provide a rodent trap that solved or mitigated some or all of the above-mentioned problems. Alternatively and/or additionally, the present invention seeks to provide an improved rodent trap.
In accordance with a first aspect of the invention there is provided a rodent trap comprising:
a trigger arranged to be triggered by a rodent;
a kill mechanism arranged to kill a rodent in response to the trigger being triggered by the rodent;
a trapdoor positioned adjacent to the kill mechanism, having a closed position and an open position;
a storage area positioned on the other side of the trapdoor to the kill mechanism;
wherein the rodent trap is arranged such that when a rodent is killed by the kill mechanism, the rodent corpse passes through the trapdoor into the storage area.
By having a trapdoor adjacent to the kill mechanism through which the rodent corpse passes, once a rodent has been killed the rodent corpse can remain in the storage area, allowing the kill mechanism to be used on further rodents without the rodent corpse first needing to be removed by an operator.
Preferably, the trapdoor is biased to return to the closed position. In this way, the rodent corpse can travel through the trapdoor into the storage area following the rodent being killed by the kill mechanism, and the trapdoor then return to the closed position. The trapdoor may be biased by a spring, for example. Advantageously, the trapdoor is biased only by gravity. This allows the use of springs in the rodent trap to be avoided, so that it does not fall with “spring trap” legislation.
Advantageously, the trapdoor comprises a latch mechanism arranged to keep the trapdoor closed before a rodent has been killed by the kill mechanism, and to release the trapdoor after a rodent has been killed by the kill mechanism. In particular where the trapdoor is positioned beneath the kill mechanism, this allows the trapdoor to be stepped upon by a rodent prior to them being killed without the trapdoor opening, so allowing the trapdoor to act as a floor before the rodent is killed.
Preferably, the trigger comprises bait to attract a rodent. Alternatively, the trigger may comprise a lure.
The rodent trap may further comprises a reset mechanism arranged to reset the kill mechanism after a rodent has been killed by the kill mechanism. Alternatively, the kill mechanism may be self-resetting.
Advantageously, the trapdoor is positioned beneath the kill mechanism, the storage area is positioned beneath the trapdoor, and the rodent trap is arranged to allow the rodent corpse to fall through the trapdoor into the storage area following being killed by the kill mechanism. In this case, preferably the trapdoor is arranged to be opened by the weight of a rodent corpse upon the trapdoor.
The kill mechanism may comprise a compressed-air powered bolt. The compressed-air powered bolt may be self-resetting.
Alternatively, the kill mechanism may comprise: a capture arm, wherein the capture arm is biased from an armed position to a triggered position; a latch arranged to hold the capture arm in the armed position; wherein the trigger is arranged, when triggered by a rodent, to release the latch so that the capture arm moves from the armed position to the triggered position to kill the rodent by exerting a force on the rodent. The kill mechanism may be a standard “snap” trap, and may be replaceable. Preferably, the reset mechanism is arranged to return the capture arm to the armed position after a rodent has been killed by the capture arm. This releases the rodent corpse from the capture arm so that it can fall through trapdoor, for example. Advantageously, the trapdoor comprises a latch mechanism arranged to keep the trapdoor closed, and wherein the reset mechanism is arranged to release the latch mechanism as the capture arm is returned to the armed position. In this way, the reset mechanism performs both tasks of resetting the kill mechanism and allowing the trapdoor to open. Preferably, the reset mechanism is arranged to engage the latch mechanism after the capture arm has returned to the armed position. Advantageously, the capture arm moves in a plane parallel to the trapdoor mechanism. The kill mechanism may be a snap trap that is mounted on its side. This prevents the trigger of the kill mechanism from being beneath the rodent corpse, which could prevent the rodent corpse falling through the trapdoor.
The trap door may be positioned to a side of the kill mechanism, and the rodent trap arranged to push the rodent corpse through the trapdoor into the storage area following being killed by the kill mechanism. In this case, advantageously the kill mechanism comprises an impactor to strike the rodent to kill it, and be further arranged to push the rodent corpse through the trapdoor into the storage area using the impactor.
Advantageously, the kill mechanism comprises a shroud, and is arranged to kill a rodent when the head of the rodent is within the space formed by the shroud. The shroud is a shaped part, configured and dimensioned so that the head of the rodent is necessarily maintained in a particular position and orientation when within the space formed by the shroud. The use of a shroud ensures the position of the rodent within the rodent trap when the kill mechanism is triggered, to aid the killing of the rodent by the kill mechanism.
Advantageously, the kill mechanism comprises a trigger that is triggered by being moved by the head of the rodent. Particularly advantageously, the trigger is configured and dimensioned to only be triggered by particular types of rodent. This allows the kill mechanism to be triggered by rats but not by mice, for example. Where the kill mechanism comprises a shroud, advantageously both the shroud and trigger are configured and dimensioned to only be triggered by particular types of rodent.
The storage area may comprise a removable bag into which the rodent corpse passes.
The storage area may comprises a preservative. This helps prevent the rodent corpse decomposing while it is in the storage area, mitigating hygiene and odour issues. The preservative may comprise formaldehyde. The preservative may be a reservoir of liquid within the storage area.
The storage area may comprise a fragrance. Preferably, the storage area comprises an odour absorbent or neutraliser, such as granular bamboo charcoal material. The use of an odour absorbent or neutraliser mitigates the effect of odours from rodent corpses in the storage area, such as volatile organic compounds, that may deter a rodent. In addition, unlike a fragrance, an odour absorbent or neutraliser will not mask attractive odours of a bait or lure.
The storage area may comprise a liquid absorbent. The liquid absorbent may be a gelling agent, bentonite clay (commonly used as cat litter), silica gel, fumed silica, or any other suitable liquid absorbent. Preferably, the liquid absorbent is a superabsorbent polymer.
The storage area may comprise a biocide. The biocide may comprise chlorhexidine, quaternary ammonium cations, or any other suitable biocide.
Advantageously, the storage area comprises a dispensing mechanism arranged to dispense a substance into the storage area. The dispensing mechanism may be arranged to dispense the substance when the kill mechanism is activated. Alternatively, the dispensing mechanism may be arranged to dispense the substance when the trapdoor is opened and/or closed. The dispensed substance may be preservative, fragrance, biocide, or any other substance advantageously dispensed into the storage area. In this way, a supply of the substance can be maintained in the dispensing mechanism, and only dispensed when required, preserving the supply of the substance.
It will of course be appreciated that features described in relation to one aspect of the present invention may be incorporated into other aspects of the present invention.
Embodiments of the present invention will now be described by way of example only with reference to the accompanying schematic drawings of which:
A rodent trap in accordance with a first embodiment of the invention is now described with reference to
As shown in
The trap tray 150 is shown in more detail in
On a side of the trap tray 150, above the opening 156, is a “snap” trap 155 comprising a trigger 155a, baited pot 155b, capture arm 155c and reset arm 155d. The snap trap 155 is mounted on the trap tray 150 by a mount 158, as shown in particular in
The capture arm 155c of the snap trap 155 is biased by a spring, so that when the trigger 155a is pressed by a rodent attempting to reach bait in the baited pot 155b, the capture arm 155c is freed from a latched position and moves to a triggered position, killing the rodent. The snap trap 155 is positioned so that the trigger is pressed by the rodent towards the side of the trap tray 150, and the capture arm moves in a plan parallel to the bottom of the trap tray 150 when it is triggered. (In other words, the snap trap 155 is mounted on its side, at right angles to the usual orientation of a snap trap when positioned on the ground.)
The motor 153 is connected to a reset arm 155d of the snap trap 155 by a re-arming mechanism 153a, so that the motor 153 can reset the snap trap 155, i.e. return the capture arm 155c to the latched position, after it has been triggered. The re-arming mechanism comprises two arms that loop around the reset arm 155d of the snap trap 155, so that when retracted the two arms pull the reset arm 155d back into position, as described in more detail below.
A cover 106 is positioned between the opening 103 and the opposite opening, to create a tunnel between the openings though which a rodent can travel. The cover 106 has an opening (not shown) into a stairwell 107, which provides a route by which a rodent can travel to the upper surface of the trap tray 150.
The operation of the rodent trap 100 is now described with reference to
As shown in
In
As shown in
As mentioned above, the motor 153 is controlled by the control circuit 152, which can identify that the snap trap 155 has been triggered by means of a sensor such as a motion sensor, or any other suitable sensing means.
As shown in
In this way, the rodent trap 100 is able to kill multiple rodents, as the snap trap 155 can be reset, and the rodents once killed falls into the body 101 of the rodent trap 100, away from the trap tray 150 and the snap trap 155. The rodent corpses can fall into a plastic bag in the body 101, for example, to enable easy disposal. In other embodiments of the invention, the rodent corpses can fall into a reservoir of liquid with preservative properties in the body 101 such as formaldehyde, to prevent the rodent corpses from decomposing, preventing hygiene and odour issues. It will be appreciated that various other possibilities could be envisioned by the skilled person.
A rodent trap in accordance with a second embodiment of the invention is now described, with reference to
As shown in
As also shown in
Again similarly to the first embodiment, the bolt trap 255 is controlled by a control circuit 252, which is powered by a battery pack 251. The control circuit 252 also controls a motor 253, which controls a latch 253a for the trapdoor 257.
Thus, in the second embodiment, when a rodent is killed by the bolt trap 255, the motor 253 releases the latch 253a. The weight of the rodent then opens the trapdoor 257, allowing it to fall through the opening 256. (The bolt trap 255 is self-resetting, and so it does not need to be reset and does not hold the rodent corpse in place until that has occurred, unlike a snap trap.) After the rodent has passed through the opening 256 the trapdoor 257 is moved to the closed position again by the spring 257s, and the motor 253 then puts the latch 253a back in place to hold the trapdoor 257 shut.
A rodent trap in accordance with a third embodiment of the invention is now described, with reference to
As shown in
The passage 304 also has a fork leading up to a kill mechanism 350, which is described in detail below. The passage 304 has a gentle slope (15-35°, for example) from the opening 303 down to the opening 302, with the fork leading to the kill mechanism 350 consequently having the same slope, from its side adjacent to the kill mechanism 350 down to its opposite side.
The body 301 also comprises a trapdoor 310. The trapdoor 310 is hinged at its top so that, when pushed open in the direction away from the kill mechanism 350, it is biased by gravity to close again. The periphery of the door comprises a flexible seal, for example a closed-cell sponge foam elastomeric seal. In addition, the periphery of the trapdoor 310, and the frame in which the trapdoor 310 is mounted, comprise corresponding magnets that helps ensure the trapdoor 310 remains tightly closed. On the opposite side of the trapdoor 310 to the kill mechanism 350 is a storage area 320 for receiving rodent corpses, as described in detail below. The storage area 320 may comprise a removable bag into which the rodent corpses are received, to enable easy disposal.
In alternative embodiments of the invention, the trapdoor 310 is sprung so that it is biased to close by the force of the spring as well as by gravity.
At the end of the passage 304 leading to the kill mechanism 350, positioned adjacent to and between the kill mechanism 350 and trapdoor 310, is a shroud 330. The shroud 330 forms a roughly cone-shaped space in which the head of a rodent can fit. Bait (not shown) is placed in the space formed by the shroud 330.
The kill mechanism 350 comprises a compressed-air powered bolt 351 powered by a compressed air canister 352. In a preferred embodiment, the compressed air is provided to the compressed air canister 352 using a manual air pump, during setup and placement of the trap by an operator. The bolt 351 has on its end an impactor 353, which is a metal head part arranged to strike and push a rodent.
The kill mechanism 350 is triggered by a rotating paddle 354, a first end of which is within the space formed by the shroud 330, so that when a rodent places its head into the shroud 300, the first end of the paddle 354 is lifted. This causes the opposite end of the paddle 354 to rotate, triggering the kill mechanism 350.
A shroud 330 in accordance with an embodiment of the invention is now described with reference to
The operation of the rodent trap 300 is now described with reference to
The triggering of the kill mechanism 350 causes the bolt 351 to move the impactor 353 with great speed and force towards the rodent 350, striking it in its shoulder region. This instantaneously kills the rodent 390, in particular due to the force on the shoulder region of the rodent 390 while the head of the rodent 390 is kept in place within the shroud 330.
As well as killing the rodent 390, the impactor 353 pushes the rodent towards the trapdoor 310. As the trapdoor is held in place only by springs and magnets, the trapdoor 310 is pushed open by the body of the rodent 390. As can be seen in
Once the rodent has passed fully into the storage area 320 the trapdoor 310 is free to close again, as shown in
As discussed above, in the rodent trap 300 a rodent is killed by the impactor 353 striking it in its shoulder region, while its head is kept in place within the shroud 330. This “neck shear” method results in a neck break and/or other internal injuries that kill the rodent.
In alternative embodiments, a rodent can be killed by the impactor 353 crushing it against a permanently or temporarily unmovable surface, before being moved to the storage area 320. The unmovable surface may be the trapdoor 310 that is temporarily kept in position, for example. This “crushing” may be done instead or as well as the “neck shear” method described above.
In further alternative embodiments, a rodent can be killed by impactor 353 apply an extreme acceleration to a rodent. This causes the brain of the rodent to be compressed against the side of its skull due to inertia, killing the rodent. Similarly, This “acceleration kill” may be done instead or as well as the “neck shear” method described above.
It will be appreciated that other methods of killing a rodent could be used in other embodiments, with or without the use of an impactor.
In embodiments of the invention the storage area (or bag therein) comprises a fragrance. In alternative embodiments the storage area alternative or additionally comprises a liquid absorbent, such as a gelling agent, bentonite clay (commonly used as cat litter), silica gel, fumed silica, or any other suitable liquid absorbent. The fragrance and/or liquid absorbent can help prevent unpleasant odours and liquids associated with decomposition.
In particularly advantageous embodiments of the invention, the storage area (or bag therein) comprises a biocide, such as chlorhexidine, quaternary ammonium cations, or any other suitable biocide. The biocide mitigates the undesirable effect of any decomposition processes occurring in and on the rodent carcass.
In particularly advantageous embodiments of the invention, the storage area comprises a dispenser, to dispense a substance into the storage area. The dispensed substance may be preservative, fragrance, biocide, or any other substance advantageously dispensed into the storage area, as described above. Particularly advantageously, the dispensing mechanism is triggered by the kill mechanism being triggered, or by the trapdoor opening and/or closing, so that the substance is only dispensed when required due to rodent being killed and passing into the storage area, preserving the supply of the substance.
While the present invention has been described and illustrated with reference to particular embodiments, it will be appreciated by those of ordinary skill in the art that the invention lends itself to many different variations not specifically illustrated herein. For example, it will be appreciated that kill mechanisms other than snap traps or bolt traps can be used in embodiments of the invention.
Where in the foregoing description, integers or elements are mentioned which have known, obvious or foreseeable equivalents, then such equivalents are herein incorporated as if individually set forth. Reference should be made to the claims for determining the true scope of the present invention, which should be construed so as to encompass any such equivalents. It will also be appreciated by the reader that integers or features of the invention that are described as preferable, advantageous, convenient or the like are optional and do not limit the scope of the independent claims. Moreover, it is to be understood that such optional integers or features, whilst of possible benefit in some embodiments of the invention, may not be desirable, and may therefore be absent, in other embodiments.
Number | Date | Country | Kind |
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1913904.7 | Sep 2019 | GB | national |
Filing Document | Filing Date | Country | Kind |
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PCT/GB2020/051799 | 7/27/2020 | WO |