Rodent trap

Abstract

The present invention relates to a rodent trap adapted for a sewer, comprising a housing defined by walls, including one or more side walls and a bottom wall, and a killing mechanism comprising a killing means movable between a retracted position and an extended position relative to the housing. The killing means comprises a front end or edge adapted for striking a rodent, wherein the front end or edge extends beyond the one or more side walls of the housing. The rodent trap is preferably mounted in a well, manhole, or inspection hole comprising a channel or invert for sewage or stormwater flow, and the front end or edge of the killing means may be contoured to match the curvature and dimensions of the channel or invert while forming a partial barrier that allows water to overflow in the extended position.

Description

[0001] Rodent trap

[0002] Technical field of the invention

[0003] The present invention relates to the field of rodent traps.

[0004] Background of the invention

[0005] Rodent control in sewers presents a unique set of challenges due to the complexity of the environment and the adaptability of the rodents. The harsh conditions within sewers, characterized by moisture and corrosion, can quickly degrade traps and bait stations. The presence of water, waste, and other debris can obstruct traps or make their placement difficult. Additionally, access to sewers is often restricted, making it challenging to monitor and maintain traps effectively.

[0006] Rodents in sewers are highly agile, able to run along the sides of the sewer pipes. The abundance of food sources in sewers also reduces the effectiveness of baited traps, as rodents do not need to seek out the bait. Moreover, sewers offer numerous hidden and hard-to-reach nesting sites, making it difficult to locate and eradicate entire rodent populations.

[0007] Installing rodent traps in wells or manholes that contain an active flow path for sewage or stormwater presents several engineering challenges, primarily related to hydraulic function, space constraints, and operational maintenance. One of the main concerns is the disruption of the flow path within the manhole. The channel or invert at the bottom of the well is designed to guide the movement of sewage or stormwater efficiently. Introducing a trap into this space can create an obstruction, leading to turbulence, sediment buildup, and the potential for blockages. These disruptions increase the risk of localized flooding orsurcharging, particularly during peak flow events when the system is under greater stress.

[0008] Another critical factor influencing the design and installation of rodent traps in wells or manholes is the need for routine visual inspection of these underground structures. Manholes and wells serve as access points for maintenance personnel to monitor the condition of the sewer or stormwater system, assess blockages, and ensure proper flow. When a rodent trap is mounted inside a manhole, it must not obstruct or interfere with this essential inspection process.

[0009] The requirement for clear visibility further limits the size of the trap’s housing. If the trap is too large, it could obscure the view of the channel or invert, preventing inspectors from detecting sediment buildup, structural damage, or other operational issues within the well. Engineers must ensure that any installed trap allows sufficient space for visual monitoring without necessitating its removal for routine checks.

[0010] Additionally, visual inspection is crucial for identifying potential failures of the trap itself. A poorly positioned or oversized trap could accumulate debris, leading to unintended blockages and disrupting the intended function of the system. If inspectors are unable to properly assess these conditions due to the trap’s placement, necessary maintenance may be delayed, increasing the risk of system failures.

[0011] Because of these factors, the size and positioning of the rodent trap must strike a balance between being large enough to be effective while still small enough to allow clear visual access to the well or manhole’s interior. This limitation reinforces the challenge of designing an optimal solution that meets both pest control needs and operational requirements.Existing traps face several specific problems. Most traps are designed to be placed at the bottom of sewer pipes, targeting rodents running along the base. This leaves rodents running along the sides unaffected, limiting the overall effectiveness of the traps. Additionally, debris or water flow can render traps ineffective, requiring constant adjustments to maintain their functionality.

[0012] W02010101481 (A1) discloses an animal trap powered by compressed gas and which includes a trigger mechanism and kill mechanism. The trap is preferably self-resetting. The trap is particularly suited to applications where low-maintenance traps are required, because it uses a simple, reliable mechanism which can kill a number of animals over a long period of time without requiring maintenance or manual resetting. The kill mechanism comprises a cylindrical piston with rectangular front end in the actuation / motion plane and a circular front end in the normal plane.

[0013] SE2050004 (A1) discloses a system for combating rats in sewer systems. The system comprises a trap with a housing, a combating device with an adapted combating radius and a detection device for activating the combating device when a rat is detected within the combating radius. The present invention also relates to a method of removable mounting of the trap inside sewer systems.

[0014] Object of the Invention

[0015] The objective of the present invention is to provide a rodent trap for controlling rodent activity in sewer systems, which enhances effectiveness and long-term sustainability while ensuring that the well, manhole, or inspection hole retains its intended functionality, including unimpeded flow, structural integrity, and accessibility for visual inspection and maintenance.Summary of the Invention

[0016] The present invention relates to a rodent trap adapted for installation in sewer systems, such as wells, manholes, or inspection holes comprising a channel or invert for sewage or stormwater flow. The rodent trap comprises a housing and a killing mechanism including a killing means movable between a retracted position and an extended position relative to the housing. The killing means comprises a front end or edge adapted for striking a rodent and extending laterally beyond one or more side walls of the housing.

[0017] By configuring the housing with a relatively narrow profile and positioning a broader killing means beneath the housing, the trap allows unobstructed visual inspection and maintenance of the sewer structure while increasing the probability of intercepting rodents that typically travel along the periphery of sewer pipes. In preferred embodiments, the front end or edge of the killing means remains positioned below the bottom wall of the housing in both the retracted and extended positions, thereby reducing water and debris ingress, limiting exposure to corrosive sewer gases, maintaining structural integrity, and preserving hydraulic performance of the sewer.

[0018] The killing means may comprise a blade, plate, spear arrangement, or other striking tool mounted to a rod and driven by a spring-operated, gas-operated, or electrically operated loading mechanism. The front end or edge of the killing means may be semi-circular, parabolic, crescent-shaped, sickle-shaped, or otherwise contoured to match the curvature and dimensions of the channel or invert. In extended position, the killing means preferably forms a partial barrier that allows water to overflow, thereby avoiding clogging of the sewer system even in the event of malfunction.

[0019] The trap may further comprise interchangeable front-end components, rod wipers, dampeners, anchoring means for attachment to inlets or outlets, andother features enhancing adaptability, durability, operational reliability, and longterm effectiveness in harsh sewer environments.

[0020] Brief description of the figures

[0021] Figure 1 is a perspective view of a rodent trap in accordance with various embodiments of the invention.

[0022] Figure 2 shows a killing means in accordance with various embodiments of the invention.

[0023] Figure 3 shows a part of a killing means in accordance with various embodiments of the invention.

[0024] Figure 4 shows four different types of blades suitable for a killing means in accordance with various embodiments of the invention.

[0025] Figure 5 shows a side view of a type of tool suitable for a killing means in accordance with various embodiments of the invention.

[0026] References

[0027] 100 Rodent trap

[0028] 110 Housing

[0029] 112 Bottom

[0030] 122 Rod

[0031] 124 Plate

[0032] 126 Front end

[0033] 128 Top endDetailed Description of the Invention

[0034] Terms and Definitions

[0035] For the purposes of the present invention and the following detailed description, the terms listed below shall have the meanings set out herein. Unless otherwise stated, these definitions apply throughout the description, claims, and drawings.

[0036] Rodent trap

[0037] In the present context, a rodent trap refers to a device adapted for installation in a sewer environment, such as a well, manhole, or inspection hole, and configured to kill rodents, preferably rats, by means of a mechanical killing mechanism.

[0038] Housing

[0039] The term “housing” refers to a structural enclosure defined by walls, including one or more side walls and a bottom wall, adapted to enclose and protect at least part of the electrical, mechanical, and / or energy-storing components of the rodent trap from environmental exposure, tampering, and mechanical damage.

[0040] Bottom wall

[0041] The “bottom wall” of the housing refers to the wall facing towards the channel, invert, or flow path of sewage or stormwater when the trap is installed. The bottom wall may comprise one or more openings for passage of a rod or other moving components of the killing mechanism.

[0042] Killing mechanism

[0043] The term “killing mechanism” refers to the assembly of components adapted to cause the death of a rodent, including at least a killing means and a movement or loading mechanism adapted to move the killing means between a retracted position and an extended position.Killing means

[0044] The term “killing means” refers to the movable part of the killing mechanism adapted to strike a rodent. The killing means may comprise, without limitation, a blade, plate, spear arrangement, block, or combination thereof, and is movable relative to the housing between a retracted position and an extended position.

[0045] Retracted position

[0046] The “retracted position” refers to the state in which the killing means is held in a loaded or charged configuration prior to activation of the trap. In this position, the killing means is positioned closer to the housing and is ready to be moved to the extended position upon triggering.

[0047] Extended position

[0048] The “extended position” refers to the state of the killing means after activation of the trap, wherein the killing means has moved outwardly from the housing with sufficient force to strike a rodent.

[0049] Front end I Front edge

[0050] The terms “front end” and “front edge” may be used interchangeably. The term “front edge” is preferably used when the killing means is shaped as a blade or plate, whereas “front end” may be used when the killing means is thicker or three-dimensional. In all cases, the front end or front edge refers to the portion of the killing means adapted to strike the rodent.

[0051] Side walls

[0052] The term “side walls” refers to the lateral walls of the housing defining its width or profile when viewed in a direction transverse to the longitudinal axis of the channel or invert.

[0053] Channel or invertThe term “channel” or “invert” refers to the shaped portion of the bottom of a well, manhole, or inspection hole that defines the intended flow path for sewage or stormwater, typically extending between an inlet and an outlet.

[0054] Well, manhole, or inspection hole

[0055] These terms refer to underground access structures forming part of a sewer or stormwater system, providing access for inspection, maintenance, and flow transition between pipe segments.

[0056] Loading mechanism

[0057] The term “loading mechanism” refers to a mechanism adapted to store potential energy when the killing means is in the retracted position and to release said energy to move the killing means to the extended position. The loading mechanism may comprise, for example, a spring-operated mechanism, a gas cartridge operated mechanism, or an electrically operated mechanism.

[0058] Rod

[0059] The term “rod” refers to an elongated structural member forming part of the killing mechanism and adapted to transmit motion between the loading mechanism and the killing means.

[0060] Actuation plate I Actuation base

[0061] The terms “actuation plate” and “actuation base” refer to a component mounted to, or formed integrally with, the rod and adapted to provide a supporting surface for a spring or similar energy-storing element.

[0062] Rod wiper

[0063] The term “rod wiper” refers to a sealing and cleaning element adapted to contact the surface of the rod during movement and to remove contaminants such as dirt, mud, ice, grease, or debris, thereby limiting ingress of contaminants into the housing.Extended beyond the side walls

[0064] When the front end or edge of the killing means is said to extend beyond the side walls of the housing, this means that at least a portion of the front end or edge laterally projects outwardly past the outer boundaries of the housing’s side walls when viewed in plan or front view.

[0065] In general

[0066] In the present context, the term “in general” when used when mentioning a feature relating to the present invention, it must be understood that the feature may be used with all embodiments of the invention, even if the mentioning is made in the detailed part of the document.

[0067] Overall Structure of the Rodent Trap

[0068] A first aspect of the present invention relates to a rodent trap adapted for a sewer. The rodent trap comprises a housing defined by walls, including one or more side walls and a bottom wall, and a killing mechanism adapted for killing a rodent. The killing mechanism comprises a killing means adapted for being movable between a retracted position and an extended position relative to the housing. The killing means further comprises a front end or edge adapted for striking a rodent, wherein the front end or edge of the killing means extends beyond the one or more side walls of the housing.

[0069] By incorporating a housing with a relatively narrower profile in comparison to a broader killing mechanism positioned and operating beneath it, the invention ensures unobstructed access for visual inspection and maintenance within the well, manhole, or inspection hole. Simultaneously, this configuration enhances the likelihood of intercepting and effectively targeting rodents that predominantly travel along the periphery of sewer pipes.A second aspect of the present invention relates to a rodent trap adapted for a sewer. The rodent trap comprises a housing defined by walls, including one or more side walls and a bottom wall, and a killing mechanism adapted for killing a rodent. The killing mechanism comprises a killing means adapted for being movable between a retracted position and an extended position relative to the housing. The killing means further comprises a front end or edge adapted for striking a rodent, wherein the front end or edge of the killing means is positioned below the bottom wall of the housing in both its retracted position and in its extended position relative to said housing.

[0070] In one or more embodiments, the features of the first aspect may be combined with the features of the second aspect.

[0071] Positioning of the Killing Means Relative to the Housing

[0072] In one or more embodiments, the front end or edge of the killing means is positioned below the bottom wall of the housing in both its retracted position and in its extended position relative to said housing.

[0073] Ensuring that the front end or edge of the killing means remains positioned below the bottom wall of the housing in both its retracted and extended positions provide several crucial advantages in terms of water resistance, operational efficiency, structural integrity, and long-term durability. One of the primary benefits is that this design reduces the size of the opening in the bottom wall of the housing, making the overall structure more resistant to water infiltration. In the harsh environment of sewers and stormwater systems, where the trap is continuously exposed to moisture and varying water levels, minimizing openings helps prevent internal damage and prolongs the device's lifespan.

[0074] Additionally, a smaller opening prevents debris accumulation within the housing. Sewer systems transport a wide range of materials, including grease, organic matter, and sediment, which could otherwise enter a larger opening and interferewith the mechanism’s function. By keeping the front end of the killing means below the housing, the risk of blockages and mechanical failures is significantly reduced, ensuring reliable operation overtime. Furthermore, this configuration enhances the structural integrity of the housing itself. A larger opening would necessitate additional reinforcement to withstand the stresses of a sewer environment, whereas a more compact and mechanically robust design reduces the likelihood of cracks, warping, or other structural weaknesses.

[0075] From a functional standpoint, this design also improves the trap’s efficiency in targeting rodents. Since rodents tend to move along the periphery of sewer pipes and channels, positioning the killing means below the housing ensures that it remains in an optimal location for intercepting and striking its target. This placement increases the likelihood of a successful kill without requiring rodents to enter an obstructive housing space, which could otherwise detertheir natural movement.

[0076] Another critical factor is protection against corrosive sewer gases such as hydrogen sulphide and ammonia. If the killing mechanism were to retract completely into the housing, these gases could more easily penetrate internal components, accelerating corrosion and reducing the device’s operational lifespan. By maintaining the front end below the bottom wall of the housing, exposure to these harmful gases is minimized, preserving the integrity of the mechanical components.

[0077] Additionally, this configuration ensures that the overall structure does not significantly disrupt the hydraulic function of the well or manhole. A poorly positioned or oversized housing could create turbulence in the flow path, promote sediment deposition, or even cause partial blockages. Keeping the killing means positioned below the housing prevents these issues while maintaining smooth and efficient wastewater or stormwater flow.Finally, ensuring that the front end remains below the bottom wall of the housing in all positions contributes to the mechanical stability of the device. The killing means, such as a plate mounted to a rod operating through the bottom wall, must maintain precise alignment for consistent and reliable function. This design prevents mechanical misalignment, jamming, or ineffective strikes, ensuring that the trap performs efficiently over an extended period.

[0078] Killing Means Configuration and Materials

[0079] In a preferred embodiment, the killing means comprises a blade or plate mounted to a rod, which acts as the support and part of a movement mechanism. The blade or plate is typically made from durable, corrosion-resistant materials, such as stainless steel, high-density polyethylene (HDPE), or other suitable composites. The dimensions of the blade or plate depend on the size of the sewage pipe, channel, or invert. The width of the blade or plate is preferably slightly less than the internal diameter of the sewage pipe, channel, or invert to allow for smooth movement.

[0080] Rod, Rod Wiper, and Contamination Protection

[0081] In one or more embodiments, the housing comprises a rod wiper adapted for cleaning the surface of the rod during movement from its extended position to its retracted position. The primary function of the rod wiper is to prevent external contaminants like dirt, mud, ice, and other debris from entering the housing and damaging internal components. As the rod moves through the wiper, any contaminants on the rod’s surface are scraped off, ensuring that the internal environment of the housing remains clean and protected.

[0082] Rod wipers come in various types to suit different applications and environmental conditions. Standard wipers feature a simple lip that contacts the rod’s surface, effectively scraping off contaminants. These wipers may be used for general-purpose applications where moderate protection is sufficient. For more challenging environments, heavy-duty wipers are designed with a more robustand aggressive lip to handle significant contamination. These are ideal for use in harsh conditions, such as those found in a sewer. Double-lip wipers offer an additional level of protection by incorporating two sealing lips. The primary lip scrapes off contaminants, while the secondary lip provides an extra seal to prevent fluid leakage, making these wipers suitable for applications that demand heightened protection and fluid sealing, such as those found in a sewer.

[0083] In situations where mechanical damage is a concern, metal-encased wipers may be used. These wipers combine a rubber or elastomer wiper lip with a metal case, providing added strength and stability.

[0084] Loading Mechanism and Energy Dissipation

[0085] In one or more embodiments, the killing means is adapted for being in its extended position by the aid of a spring-operated loading mechanism adapted for storing potential energy when the killing means is in its retracted position.

[0086] In one or more embodiments, the spring-operated loading mechanism comprises a spring, and an actuation plate or actuation base mounted to the killing means’ rod, and wherein the actuation plate or actuation base is adapted for providing a supporting surface for the spring.

[0087] In one or more embodiments, the bottom of the housing comprises a dampener adapted for receiving the actuation plate or actuation base when the killing means is in its extended position to absorb and dissipate some of the kinetic energy during the spring’s expansion.

[0088] Shape and Geometry of the Front End or Edge

[0089] Preferably, the front end or edge of the killing means is semi-circular or parabolic.

[0090] In one or more embodiments, the front end or edge of the killing means is semicircular or parabolic in the actuation / motion plane.By integrating a semi-circular or parabolic killing means, it increases the likelihood of hitting a rodent running along the sides of the sewer pipes.

[0091] Power and Rechargeability

[0092] Preferably, the killing mechanism is rechargeable. Advantageously the killing mechanism is a gas cartridge operated device or an electrically operated device. Other types of killing devices may however also be used without limiting the scope of the invention.

[0093] Mounting in Wells, Manholes, and Channels

[0094] In one or more embodiments, the housing is adapted for being mounted in a well or manhole. Preferably, the well or manhole comprises a channel or invert forming part of the well or manhole bottom that contains the flow path for sewage or stormwater.

[0095] In one or more embodiments, the front end or edge of the killing means is adapted for entering the channel or invert in its extended position. The front end or edge of the killing means may also be positioned within the channel or invert in its retracted position but is moved further therein when in its extended position. The retracted position is used for the situation where the trap is charged, and the extended position is the position of the front end or edge of the killing means after the trap has fired.

[0096] Channel or Invert Matching and Anchoring

[0097] In one or more embodiments, the front end or edge of the killing means is specifically contoured to match the curvature and dimensions of said channel or invert.

[0098] In one or more embodiments, the channel or invert comprises an inlet and an outlet, and wherein the housing comprises means adapted for being anchored tosaid inlet or to said outlet, preferably to the top wall of said inlet or outlet. This embodiment makes it possible to precisely position the trap above a channel, or invert in a well or manhole. The trap may e.g., be mounted with a method as disclosed in EP2685015. Basically, the trap housing with the anchor means mounted thereto is attached to a flexible member and lowered down the well or manhole by means of a pole, while keeping the free end of the flexible member above the well or manhole. The barrier is then inserted into the side branch pipe (i.e. , inlet or outlet) by means of the pole. The flexible member is tightened along the inner wall and above the branch pipe of the well or manhole, providing a substantially vertical upwards force on the trap housing. After tightening, the free end of the flexible member is fastened inside the well or manhole. The anchor means may e.g., comprise one or more anchoring hooks.

[0099] Partial Barrier and Anti-Clogging Features

[0100] In one or more embodiments, the front end or edge of the killing means is shaped to create a barrier that extends only partway up the height of said channel or invert. In case of malfunction, this embodiment will prevent clogging of the sewer pipes.

[0101] Alternative Front-End Shapes and Dimensions

[0102] In one or more embodiments, the front end or edge of the killing means is shaped as a sickle.

[0103] In one or more embodiments, the front end or edge of the killing means is crescent-shaped.

[0104] In one or more embodiments, the front end or edge of the killing means spans 50-95% of the diameter of said channel or invert, such as 55-90%, e.g., 60-85%, such as 65-80%, e.g., 70-75% of the diameter of said channel or invert.In one or more embodiments, the killing means further comprises a top end or top edge, and wherein the distance between the top end or top edge and front end or front edge is less than the channel or invert’s full height, thereby allowing water to overflow the top end or top edge when the killing means is in its extended position.

[0105] In one or more embodiments, the front end or edge of the killing means, when the killing means is in its extended position, is adapted avoid contact with the channel or invert, e.g., adapted to form a gap, preferably of within the range of 1-10 mm, between the front end or edge of the killing means and the channel or invert, such as within the range of 2-9 mm, e.g., 3-8 mm, such as 4-6 mm between the front end or edge of the killing means and the channel or invert.

[0106] Further Embodiments and Optional Features

[0107] Sensing, Triggering, and Detection Embodiments

[0108] In one or more embodiments, the rodent trap comprises a detection system adapted to detect the presence of a rodent beneath the housing and to initiate actuation of the killing mechanism. The detection system may comprise one or more sensors selected from motion sensors, infrared sensors, optical sensors, proximity sensors, pressure or contact sensors, vibration sensors, acoustic sensors, or combinations thereof. The detection system may be arranged to detect movement of a rodent along the channel or invert or along side walls of the sewer pipe and to trigger the killing mechanism when the rodent is positioned within an effective striking zone of the killing means. The detection system may be housed within the housing or partially external thereto, and may be protected against moisture, debris, and corrosive sewer gases.

[0109] Control Logic and Conditional Actuation Embodiments

[0110] In one or more embodiments, the rodent trap comprises a control arrangement adapted to control actuation of the killing mechanism based on one or morepredefined conditions. Such conditions may include confirmation of rodent presence by multiple sensor inputs, a predefined delay between detection and actuation, prevention of actuation during periods of high water flow, or manual or remote arming and disarming of the trap. The control arrangement may be adapted to reduce unintended activations, improve safety during maintenance, and ensure reliable operation under varying sewer conditions. In one or more embodiments, the control arrangement may be integrated with an electrically operated killing mechanism ora sensor-based triggering system.

[0111] Flow-Adaptive and Hydraulic-Safety Embodiments

[0112] In one or more embodiments, the front end or edge of the killing means is shaped or configured to reduce disturbance to the hydraulic flow within the channel or invert. The front end or edge may comprise a curved, tapered, or streamlined geometry adapted to guide sewage or stormwater flow and to reduce turbulence, sediment accumulation, or debris build-up. In one or more embodiments, the killing means is adapted to maintain a substantially unobstructed flow path even when in its extended position, thereby preserving the hydraulic performance of the well, manhole, or inspection hole during normal operation and peak flow conditions.

[0113] Adjustable Positioning and Retrofitting Embodiments

[0114] In one or more embodiments, the rodent trap is adapted to allow adjustment of the position of the killing means relative to the channel or invert. Such adjustment may include vertical adjustment, lateral adjustment, or adjustment of the extent to which the front end or edge of the killing means extends into the channel or invert. In one or more embodiments, interchangeable spacers, adapters, or mounting elements are provided to adapt the trap to different channel sizes, pipe diameters, or installation geometries. In one or more embodiments, the killing mechanism or the front end or edge of the killing means is adapted to be retrofitted to an existing housing, mounting arrangement, orsewer installation, thereby enabling upgrading of existing trap systems without full replacement.

[0115] Maintenance, Fail-Safe, and Jam-Prevention Embodiments

[0116] In one or more embodiments, the rodent trap comprises one or more fail-safe features adapted to reduce the risk of malfunction, jamming, or obstruction of the sewer system. Such features may include limiting the maximum extension force of the killing means, providing deformable or sacrificial components on the front end or edge of the killing means, or enabling automatic or assisted retraction of the killing means after actuation. In one or more embodiments, the trap is adapted to maintain a partial flow path through the channel or invert even in the event of mechanical failure, thereby reducing the risk of clogging or surcharging.

[0117] Materials and Environmental Resistance Embodiments

[0118] In one or more embodiments, one or more components of the rodent trap, including the housing, killing means, rod, or mounting elements, are made from or coated with materials selected to withstand the harsh sewer environment. Such materials or coatings may include corrosion-resistant metals, polymers, composites, low-friction coatings, anti-corrosion coatings, or combinations thereof. In one or more embodiments, sacrificial or replaceable components are provided to protect critical structural or mechanical parts from long-term exposure to moisture, chemicals, or corrosive sewer gases, thereby extending the operational lifespan of the trap.

[0119] Embodiments with Reference to the Figures

[0120] Figure 1 illustrates an embodiment of a rodent trap 100 according to the invention. In general, the rodent trap 100 comprises a housing 110 that encloses most of the electrical and mechanical parts. The housing 110 is designed to protect the different mechanisms from tampering and environmental factors.The killing mechanism within the trap 100 is of a piston type, designed to move swiftly and with enough force to ensure a quick and humane kill. The killing mechanism comprises a killing means adapted for being in a loaded configuration (retracted position), and an extension state (extended position). In the loaded configuration, the piston is retracted and held in place by a loading mechanism (see parts thereof in Figure 2). The trap is set and ready to be triggered. When a rodent passes below the trap and activates a trigger mechanism (e.g., activating sensors), the trigger releases the tension in the loading mechanism. Upon release, the stored energy in the loading mechanism propels the piston from the retracted state to the extended state. The swift movement of the piston strikes the rodent, causing immediate death.

[0121] As can be seen from Figure 1 , the housing 110 is configured with a relatively narrower profile in comparison to a broader killing mechanism 122, 124 positioned and operating beneath it. In general, the front end 124,126 or edge of the killing means extends beyond the side walls of the housing. The front end 124,126 or edge of the killing means is designed to extend beyond the side walls of the housing, typically by a distance of approximately 1 to 20 cm on each side, such as 2-18 cm, e.g., 3-17 cm, such as 4-16 cm, preferably at least 5 cm, e.g., 5-15 cm on each side.

[0122] The piston type killing means (see Figure 1) is shown comprising two plates 124A, 124B mounted to a rod 122, which acts as the support and part of a movement mechanism. Only one end of the rod 122 is shown in Figure 1. A plate, in this context, is a flat, broad surface, which may have some sharpness but is generally not as thin or sharp-edged as a blade. It is more akin to a blunt instrument with a larger impact area. In general, multiple (such as two or three) plates or blades may be mounted to the rod, each plate or blade defined as discussed in general within the description. A single plate is also possible.In general, the loading mechanism is responsible for holding the killing means in a retracted (loaded) state. It may include a spring 132 (as seen in Figure 2) or similar tension device that stores potential energy when the killing means is in the retracted position.

[0123] The entire plate 124 is positioned below the housing in the killing means’ retracted position. This is to minimize the opening into the housing, thereby reducing the risk of water and or dirt ingress.

[0124] The killing means comprises a front end 126 or edge adapted for striking a rodent. Here, the front end of the killing means is the plate 124, which front end defines the killing means’ front edge 126. In general, the front end of the killing means is semi-circular or parabolic. By integrating a semi-circular or parabolic killing means, it increases the likelihood of hitting a rodent running along the sides of the channel or invert.

[0125] The shown rodent trap comprises a housing adapted for being mounted in a well or manhole with a channel or invert formed in its bottom. The channel or invert contains the flow path for sewage or stormwater. The front end 126 of the plate 124 is adapted for entering the channel or invert in its extended position and is specifically contoured to match its curvature and dimensions.

[0126] When the killing means is in its extended position, the front end, here the plate 124, is shaped to create a barrier that extends only partway up the height of the channel or invert to allow water to flow over, thereby avoiding clogging the channel. The shown plate 124 is shaped as a circular arch. In general, other shapes are suitable, such as the shapes A-D shown in Figure 4. Shape A may be defined as a semicircle. Shape B may be defined as a pie slice shape, shape C as an elliptical arch, and shape D as a sickle shape. Hence, these examples embody a killing means with a top end 128 and a front end 126 and where the distance between the top end 128 and front end 126 is less than the channel orinvert’s full height, thereby allowing water to overflow the top end of the killing means when in its extended position.

[0127] Returning to Figure 2, a central embodiment of the trap’s operation is the loading mechanism, which includes a spring 132 and an actuation plate 123, which in general may also be an actuation base, such as protrusions mounted to, or formed in, the rod, and extending radially away from the rod centre. The spring 132 is here shown in compressed (loaded) state, storing potential energy. The actuation plate 123 provides a stable surface within the housing where the spring 132 rests, offering necessary support and stability.

[0128] In general, the front end or front tool may also have other shapes than a plate, such as comprising one or more spikes, spears 125 (as shown in Figure 5, multiple rows of spears may in general be present), blades, blocks, and / or plates extending from a base part, e.g., a base plate 127, and / or a rod connection part 129 adapted for releasably fastening to the rod. The plates 124 disclosed in Figure 4 may in general also be provided with a rod connection part, e.g., as the one shown in Figure 5. The spears 125 shown in Figure 5 are shaped to form a front end of the front tool that is parabolic, or at least specifically contoured to match the curvature and dimensions of a channel or invert.

[0129] In general, the front end or edge of the killing means may be designed to be releasably fastened to the rest of the killing mechanism, allowing for interchangeable components with varying shapes and sizes. This modular configuration provides significant advantages, particularly in adapting the trap system to different sewer environments while maintaining operational efficiency and ease of maintenance.

[0130] By making the front end of the killing means detachable, the invention enables customization of the striking surface according to specific requirements. Sewer systems vary significantly in size and shape, with differences in gutter widths,inlet and outlet dimensions, and the geometry of wells, inspection holes, and manholes. A fixed, non-adjustable killing mechanism may not perform optimally across different environments, whereas a releasable front end allows for tailored adaptation. For example, in larger sewer systems, a broader or more extended killing surface may be required to effectively target rodents moving along wider pathways, while in more confined spaces, a more compact front end may be necessary to prevent obstructions or interference with fluid flow.

[0131] This design also ensures that the same trap system can be utilized across multiple applications without requiring an entirely new unit for each specific installation. Instead of manufacturing multiple distinct traps for different settings, the user can simply swap out the front end for one that best fits the installation site. This not only enhances cost efficiency by reducing the need for separate trap models but also simplifies logistics, as a single trap system with interchangeable components can serve a wide range of configurations.

[0132] Another key advantage is the ability to optimize the shape of the front end for minimal obstruction of flow paths in stormwater or sewage channels. Some sewer installations may require a tapered, streamlined front end to reduce turbulence and prevent sediment accumulation, whereas other environments may benefit from a broader impact surface to maximize rodent interception. The releasable fastening mechanism allows operators to select and install the most suitable front-end configuration without altering the core trap system.

[0133] From a maintenance and durability perspective, this modular approach is highly beneficial. If the front end of the killing means becomes worn, damaged, or corroded due to prolonged exposure to harsh sewer conditions, it can be easily replaced without needing to replace the entire killing mechanism. This reduces downtime, enhances sustainability, and ensures the longevity of the trap system.Additionally, the ability to interchange different front-end components allows for testing and optimization based on local conditions. Operators can assess which shape and size work best for specific rodent behaviours, flow patterns, and sewer geometries, leading to improved overall trap performance.

[0134] In one or more embodiments, the triggering described with reference to Figure 1 is performed by the detection system and / or control arrangement as described above.

Claims

24Claims1. A rodent trap (100), adapted for a sewer, comprising:- a housing (110) defined by walls, including one or more side walls and a bottom wall; and- a killing mechanism adapted for killing a rodent, and comprising a killing means adapted for being in a retracted position and an extended position relative to said housing (110); wherein the killing means comprises a front end (124, 126) or edge adapted for striking a rodent;characterized in that the front end (124,126) or edge of the killing means extends beyond the one or more side walls.

2. The rodent trap (100) according to claim 1, wherein the front end (124,126) or edge of the killing means is configured to be releasably fastened to the rest of the killing mechanism or killing means, allowing for interchangeable components with varying shapes and sizes.

3. The rodent trap (100) according to any one of the claims 1-2, wherein front end (124,126) or edge of the killing means is designed to extend beyond the one or more side walls of the housing by a distance of 1-20 cm on each side.

4. The rodent trap (100) according to any one of the claims 1-3, wherein the housing (110) is adapted for being mounted in a well, inspection hole, or manhole, said well, inspection hole, or manhole comprising a channel or invert forming part of the well, inspection hole, or manhole bottom that contains the flow path for sewage or stormwater, and wherein the front end (124,126) or edge of the killing means is adapted for entering said channel or invert in its extended position.

5. The rodent trap (100) according to any one of the claims 1-4, wherein the front end (124,126) or edge of the killing means is positioned below the bottom wall ofthe housing (110) in both its retracted position and in its extended position relative to said housing (110).

6. The rodent trap (100) according to any one of the claims 4-5, wherein the front end (124,126) or edge of the killing means is specifically contoured to match the curvature and dimensions of said channel or invert.

7. The rodent trap (100) according to any one of the claims 4-6, wherein the channel or invert comprises an inlet and an outlet, and wherein the housing (110) comprises means adapted for being anchored to said inlet or to said outlet, preferably to the top wall of said inlet or outlet.

8. The rodent trap (100) according to any one of the claims 1-7, wherein the front end (124,126) or edge of the killing means is semi-circular or parabolic in the actuation / motion plane.

9. The rodent trap (100) according to any one of the claims 4-8, wherein the front end (124,126) or edge of the killing means, when the killing means is in its extended position, is adapted to avoid contact with the channel or invert, e.g., adapted to form a gap, preferably of within the range of 1-10 mm, between the front end (124,126) or edge of the killing means and the channel or invert.

10. The rodent trap (100) according to any one of the claims 4-9, wherein the front end (124,126) or edge of the killing means spans 50-95% of the diameter of said channel or invert.

11. The rodent trap (100) according to any one of the preceding claims, wherein the housing (110) comprises a rod wiper adapted for cleaning the surface of the rod (122) during movement of the killing means from its extended position to its retracted position.

12. The rodent trap (100) according to claim 11 , wherein the rod wiper is a heavy-duty rod wiper, a double-lip rod wiper, or a metal-encased rod wiper.

13. The rodent trap (100) according to any one of the preceding claims, wherein the bottom wall of the housing (110) comprises a dampener adapted for receiving an actuation plate or actuation base when the killing means is in its extended position, thereby absorbing and dissipating kinetic energy during expansion of the loading mechanism.

14. The rodent trap (100) according to any one of the preceding claims, wherein the loading mechanism comprises a spring and an actuation plate or actuation base mounted to the rod (122), and wherein the actuation plate or actuation base is adapted for providing a supporting surface for the spring.

15. The rodent trap (100) according to any one of the preceding claims, wherein the killing means comprises a blade or plate (124) mounted to the rod (122).

16. The rodent trap (100) according to claim 15, wherein the killing means comprises two or three blades or plates mounted to the rod (122).

17. The rodent trap (100) according to any one of the preceding claims, wherein the front end or edge of the killing means comprises one or more spikes or spears (125).

18. The rodent trap (100) according to any one of the preceding claims, wherein, in the extended position, the front end or edge of the killing means forms a barrier extending only partway up the height of the channel or invert, such that water is able to overflow a top end or top edge of the killing means.

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