Air Register Assembly For Restricting Airflow During Thermal Event

Abstract

The subject disclosure provides for an air register assembly which includes a frame having an interior side and an exterior side. The air register assembly further includes a plurality of louvres moveable between a plurality of open positions and a closed position. The air register assembly further includes an adjustment lever to adjust the louvres between the open and closed positions. The air register assembly further includes a support base coupled to the frame, a retention device having a fuse. The air register assembly further includes a biasing member maintained in a biased state by the retention device and a rod wherein the retention device releases the biasing member when the fuse activates with the biasing member driving the rod against the adjustment lever or one of said louvres such that the louvres are moved into the closed position for restricting airflow through the air duct during a thermal event.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The subject application claims priority to and all the benefits of U.S. Provisional Patent Application No. 63 / 725,918 , filed Nov. 27, 2024, the disclosure of which is incorporated by reference in its entirety herein.FIELD OF DISCLOSURE

[0002] The subject disclosure generally relates to an air register assembly.BACKGROUND

[0003] Air registers assemblies are used to regulate airflow into a room or space and typically include adjustable louvres that allow a user to control the volume and direction of airflow. Typical air registers often lack mechanisms to respond automatically to hazardous conditions, such as a thermal event caused by fire or overheating within the ductwork. Air register assemblies that do include mechanisms to respond to hazardous conditions are often complicated and expensive. Therefore, there is a need in the art for an air register assembly that is cost-effective and can respond to hazardous conditions.SUMMARY

[0004] The subject disclosure provides for an air register assembly for use with an air duct to restrict airflow during a thermal event. The air register assembly includes a frame having an interior side and an exterior side with the interior side facing the air duct. The air register assembly further includes a plurality of louvres mounted to the frame and moveable between a plurality of open positions and a closed position. The air register assembly further includes an adjustment lever mounted to the frame to adjust the louvres between the open and closed positions. The air register assembly further includes a support base coupled to the frame, a retention device mounted to the support base with the retention device having a fuse. The air register assembly further includes a biasing member coupled to the frame and maintained in a biased state by the retention device and a rod operatively coupled to the frame wherein the retention device releases the biasing member into an unbiased state when the fuse activates with the biasing member driving the rod against the adjustment lever or one of said louvres such that the louvres are moved into the closed position for restricting airflow through the air duct during a thermal event.

[0005] The subject disclosure also provides for an air register assembly for use with an air duct to restrict airflow during a thermal event. The air register assembly includes a frame having an interior side and an exterior side with the interior side facing the air duct. The air register assembly further includes a plurality of louvres mounted to the frame and moveable between a plurality of open positions and a closed position. The air register assembly further includes an adjustment lever mounted to the frame to adjust the louvres between the open and closed positions. The air register assembly further includes a support base coupled to the frame, a fuse, and a biasing member having a first end and a second end with the first end coupled to the support base and the second end coupled to the fuse with said biasing member maintained in a biased state by the fuse. The air register assembly further includes a rod operatively coupled to said frame wherein the fuse releases the biasing member into an unbiased state when the fuse activates with the biasing member driving the rod against the adjustment lever or one of the louvres such that the louvres are moved into the closed position for restricting airflow through the air duct during a thermal event.BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings.

[0007] FIG. 1 is a perspective view of an air register assembly.

[0008] FIG. 2 is a side view of the air register assembly with a plurality of louvres in an open position.

[0009] FIG. 3 is a side view of the air register assembly with the plurality of louvres between the open position and a closed position.

[0010] FIG. 4 is a side view of the air register assembly with a fuse activated and the plurality of louvres moved into the closed position by a rod driven by a biasing member.

[0011] FIG. 5 is a partial bottom view of the air register assembly with the plurality of louvres in the open position.

[0012] FIG. 6 is a partial exploded view of the air register assembly.

[0013] FIG. 7A is a side view of the air register assembly with the fuse disposed in an alternate configuration and the plurality of louvres in the open position.

[0014] FIG. 7B is bottom partial sectional view of the air register assembly with the fuse disposed in another configuration with the plurality of louvres in the open position.

[0015] FIG. 8 is a side view of the air register assembly shown in FIG. 7A with the louvres between the open and closed positions.

[0016] FIG. 9 is a side view of the air register assembly shown in FIG. 7A with the fuse activated and the plurality of louvres moved into the closed position by the rod driven by the biasing member.

[0017] FIG. 10 is a side view of the air register assembly with the rod configured to directly engage one of the louvres and the louvres in the open position.

[0018] FIG. 11 is a side view of the air register assembly shown in FIG. 10 with the plurality of louvres between the open and closed positions.

[0019] FIG. 12 is a side view of the air register assembly shown in FIG. 10 with the fuse activated and the plurality of louvres moved into the closed position by the rod driven by the biasing member.

[0020] FIG. 13 is a side view of the air register assembly according to a second embodiment with the plurality of louvres in the open position.

[0021] FIG. 14 is a side view of the air register assembly shown in FIG. 13 with the plurality of louvres between the open and closed positions.

[0022] FIG. 15 is a side view of the air register assembly shown in FIG. 13 with the fuse activated and the plurality of louvres moved into the closed position by the rod driven by the biasing member.

[0023] FIG. 16 is a partial bottom view of the air register assembly shown in FIG. 13.

[0024] FIG. 17 is a side view of the air register assembly with the fuse in another configuration and the plurality of louvres in the open position.

[0025] FIG. 18 is a side view of the air register assembly shown in FIG. 17 with the plurality of louvres between the open and closed positions.

[0026] FIG. 19 is a side view of the air register assembly shown in FIG. 17 with the fuse activated and the plurality of louvres moved into the closed position by the rod driven by the biasing member.DETAILED DESCRIPTION

[0027] Referring to the Figures, wherein like numerals indicate like or corresponding components throughout the several views, an air register assembly 30 (also referred to as an air duct register) for use with an air duct to restrict airflow during a thermal event is shown.

[0028] Air registers are a common feature in houses and commercial buildings. Their primary purpose is to allow heated or cooled air to enter a given room from the ductwork. Air registers often include adjustable louvres (also referred to as dampening louvres) that let users control the direction and volume of airflow for better comfort or circulation.

[0029] Referring to FIG. 1, the air register assembly 30 is shown having a frame 32 with an interior side 34 facing the air duct and an exterior side 36 facing away from the air duct. The assembly 30 also includes a plurality of louvres 42 mounted to the frame 32, which are moveable between a plurality of open positions and a closed position. The plurality of open positions includes any position between the fully open position and the closed position, excluding the closed position itself. For example, FIG. 2 shows the louvres 42 in the fully open position, while FIG. 3 depicts the louvres 42 in an intermediate position. Both positions are considered part of the plurality of open positions. The assembly 30 further includes an adjustment lever 44 mounted to the frame 32, which is used to adjust and move the louvres 42 between the open and closed positions. The assembly 30 may further include a faceplate 38 defining the exterior side 36 with the faceplate 38 having a plurality of slits 40 (shown in FIG. 1). It should be appreciated that the term frame may include the frame 32, faceplate 38, and slits 40. The slits 40 are openings or gaps in the faceplate 38 allowing for air to pass through them and may include angles for each opening. It should be appreciated that the faceplate 38 and slits 40 shown in the Figures are illustrative and may look different in practice. The configuration, size, orientation, and pattern of the slits 40 may vary based on functional requirements such as airflow optimization, acoustic performance, and thermal management, as well as aesthetic considerations to complement the surrounding environment. Alternative designs may include different geometries, decorative elements, or materials to achieve the desired balance between performance and visual appeal.

[0030] Similarly, the frame 32, louvres 42, and adjustment lever 44 can be of any suitable shape, size or configuration depending on the design, performance, and / or aesthetic requirements. For example, the adjustment lever 44 may be as shown in FIG. 1, slidably coupled to an adjuster 64 (through a rod 54) disposed on the faceplate 38 of the frame 32. Alternatively, the adjustment lever 44 may be as shown in FIG. 10, coupled to a rotary dial 68 or rotary control. Additionally or alternatively, the assembly 30 may include a single louvre or a greater number of louvres than those illustrated in the Figures, with the number of louvres being determined by the requirements of the specific air duct application.

[0031] While air registers are designed to provide users with adjustable control over airflow direction and volume to enhance comfort and circulation, they can also inadvertently act as a pathway for a thermal event, such as a fire, to spread within a building. Fires may spread through air registers via the ductwork because these components create a continuous pathway between rooms and floors. When a fire ignites in one area of a building, the intense heat causes air to rise, creating convection currents that can carry smoke, hot gases, and even small embers through the HVAC ductwork. The air registers provide direct access for hot gases and embers to enter adjacent spaces, especially if the louvres are open. The mechanism and specific components that allow the air register assembly 30 to close the louvres 42 in response to the thermal event will be discussed in detail below.

[0032] With continuing reference to FIG. 1, the assembly 30 further includes a support base 46 coupled to the frame 32 and a retention device 48 (also referred to as a spring-loaded lever system) mounted to the support base 46 with the retention device 48 including a fuse 50 (also referred to as a temperature-sensitive actuator). The support base 46 and retention device 48 are physical components of the assembly 30 that help hold the fuse 50 in place. The support base 46 and retention device 48 may be shaped and configured differently depending on the application. One implementation may include the retention device 48 having a retention arm 62 pivotably coupled to the support base 46 and engaging the fuse 50 and the frame 32 to maintain a biasing member 52 (also referred to as a spring) in a biased state. It should be appreciated that the specific size, shape, and arrangement of the support base 46 and retention device 48 (which may include the retention arm 62) may be customized to fit the specific need for the given application.

[0033] The fuse 50 is a heat-sensitive component designed to activate in response to a thermal event, such as a fire. A fuse activates by responding to an external event (such as the aforementioned thermal event) and undergoes a physical change that releases a mechanical restraint. For example, if the fuse 50 is designed with a material such as eutectic alloy, the alloy will melt or deform at a specific temperature. When the fuse 50 activates, the fuse 50 mechanically releases the retention device 48, which then ultimately closes the plurality of louvres 42, as will be described in greater detail below.

[0034] The fuse 50 may be a fusible link configured to melt at a predetermined and calibratable temperature (e.g., approximately 165° F.). Alternative fuse types may include the aforementioned heat-activated mechanical fuses utilizing eutectic alloys but may further include bi-metallic thermal fuses employing a bi-metal strip that bends when heated, and glass tube thermal fuses, which are commonly used in electronics but may be adapted for thermal activation in HVAC applications. The selection of the fuse type may depend on factors such as the desired activation temperature, environmental conditions, and / or regulatory requirements.

[0035] The placement of the support base 46, retention device 48, and fuse 50 within the assembly 30 may affect the time it takes for the fuse 50 to activate. Positioning the fuse 50 in the airflow pathway, as illustrated in FIG. 7B, allows the fuse 50 to be directly exposed to the heat and hot gases generated by the thermal event within the ductwork. This direct exposure may help the fuse 50 reach its activation temperature quicker, minimizing any delay in closing the louvres 42 to prevent further spread of the fire. The placement of the support base 46, retention device 48, and fuse 50 can vary depending on space constraints, airflow patterns, and accessibility requirements within the specific air register design.

[0036] The air register assembly 30 further includes the biasing member 52 coupled to the frame 32 and maintained in the biased state by the retention device 48, which is shown in FIG. 2 in a side view and can further be seen in an exploded view in FIG. 6. The biasing member 52 is operatively coupled to the frame 32. As mentioned above, when the fuse 50 activates in response to the thermal event, the retention device 48 releases the biasing member 52 into an unbiased state. The biasing member 52 drives the rod 54 against the adjustment lever 44 or one of the louvres 42 such that the louvres 42 are moved into the closed position for restricting airflow through the air duct during the thermal event. The specifics of the louvres 42 being moved closed and how the retention device 48 releases the biasing member 52 will be discussed in greater detail below.

[0037] The biasing member 52 may be implemented using various types of springs, such as compression springs, extension springs, torsion springs, and / or constant-force springs, depending on the desired motion and force characteristics. Several attributes are considered when choosing the type of spring including spring rate (stiffness), travel distance, material composition, and temperature tolerance. For example, the spring must exert sufficient force to overcome friction and reliably drive the rod 54 to close the louvres 42, while also fitting within the available space in the assembly 30. Materials for the biasing member 52, such as stainless steel or other high-temperature alloys, may help enhance durability and heat resistance during a thermal event. Additional factors such as fatigue resistance and compliance with fire safety standards also may influence the type and material of a given biasing member. These considerations allow the biasing member 52 to be tailored for optimal performance under the specific conditions of the intended installation.

[0038] The biasing member 52 may also be coupled to the frame 32 in different locations within the assembly 30. For example, FIGS. 1-12 show the assembly 30 further including a housing 56 mounted to the frame 32 and a piston 58 disposed within the housing 56. The biasing member 52 is disposed within the housing 56 to continuously bias the piston 58 so that the piston 58 engages the rod 54 when the biasing member 52 is released into the unbiased state. However, the housing 56 may be mounted to the frame 32 in different locations depending on the specific application. When determining the placement of the housing 56 within the assembly 30, several factors may be considered such as the available space within the frame 32, the required motion path of the rod 54, and the desired point of engagement with either the adjustment lever 44 (as shown in FIG. 2) or one of the louvres 42 (as shown in FIG. 10). By evaluating such factors, the housing 56 can be strategically located to balance performance, durability, and ease of installation for the specific application.

[0039] As described above, the retention device 48 releases the biasing member 52 into the unbiased state after activation of the fuse 50. As shown in FIGS. 1-12, the retention device 48 may further include the retention arm 62, which may further include a finger 66. The finger 66 extends from the retention arm 62 to engage and hold the piston 58. As shown in FIGS. 4, 9, and 12, when the fuse 50 activates, the retention arm 62 is no longer braced by the fuse 50 and thereby allowed to pivot. The pivoting motion of the retention arm 62 frees the piston 58 and the coupled biasing member 52 from being held by the finger 66, which then permits the biasing member 52 to release into the unbiased state. The rod 54 may include an abutment 60 (shown in FIG. 5) and the piston 58 engages the abutment 60 when the biasing member 52 is in the unbiased state. In other words, as the piston 58 is moved toward and engages with the abutment 60, the rod 54 is driven into the adjustment lever 44 and forces a guide pin 70 on the adjustment lever 44 to travel along a slot 72 of the rod 54. This travel upward and to the right (as shown in FIG. 4) causes the louvres 42 to be moved into the closed position.

[0040] As mentioned above, the rod 54 may be driven directly against the louvres 42 (as opposed to against the adjustment lever 44), which can be seen in FIGS. 10-12. Specifically, FIG. 12 shows the fuse 50 activated with the retention arm 62 able to pivot thereby releasing the piston 58, which allows the rod 54 to be driven directly into the louvres 42 moving the louvres 42 into the closed position.

[0041] Throughout the thermal event, it is important that the louvres 42 remain continuously closed to prevent further spread of heat, smoke, or flames through the ventilation system. As such, the rod 54 is continuously driven against the adjustment lever 44 or one of the louvres 42 by the biasing member 52 to continuously hold the louvres 42 in the closed position during the thermal event. This allows the rod 54 to maintain constant pressure to counteract any forces that might otherwise cause the louvres 42 to reopen, such as thermal expansion, vibration, or pressure changes within the ductwork. The continuous pressure additionally helps ensure that the louvres 42 remain closed even if other components experience stress or deformation under high temperatures.

[0042] The air register assembly 30 further allows for manual adjustment of the louvres 42 while the biasing member 52 is maintained in the biased state. This is shown in FIGS. 3, 8, 11, 14, and 18. Allowing for manual adjustment separates the functionality of the assembly 30 into everyday airflow adjustment and restriction of airflow during the thermal event. For example, a user may want to adjust the louvres 42 to be closed halfway to regulate airflow for comfort or energy efficiency without affecting the state of the biasing member 52. This separation of functionality allows the assembly 30 to provide everyday usability while reserving the restriction of airflow for emergency situations.

[0043] To help facilitate this separation of functionality, the rod 54 may extend through the biasing member 52 and may move relative to the biasing member 52 during adjustment of the louvres 42, which can be seen in FIGS. 2-4, 7A, and 8-12. Additionally, a portion of the rod 54 may extend through the piston 58 and the housing 56. Specifically, FIG. 2 shows the louvres 42 in the open position with a portion of the rod 54 extending through the biasing member 52, piston 58, and the housing 56. The rod 54 extending through these components allows the louvres 42 to be manually adjusted without affecting the state of the biasing member 52. As the adjuster 64 is moved to the left, the guide pin 70 of the adjustment lever 44 is forced to slide to the upper right of the slot 72, which progressively closes the louvres 42. As the louvres 42 are moved into the closed position, the rod 54 slides partially out of the biasing member 52, piston 58, and housing 56. Conversely, as the adjuster 64 is moved to the right, the guide pin 70 of the adjustment lever 44 is forced to slide to the lower left of the slot 72, which opens the louvres 42. As the louvres 42 are moved into the open position, the rod 54 slides further (and possibly partially through) the biasing member 52, the piston 58, and the housing 56.

[0044] The assembly 30 may include the rotary dial 68 shown in FIGS. 10-12 and 17-19, which allows the user to adjust the louvres 42 without affecting the state of the biasing member 52. When the rotary dial 68 is turned counterclockwise, the louvres 42 progressively move to the closed position. As the louvres 42 close, the louvre 42 designed to interact with the rod 54 shifts farther away from the rod 54. For example, FIG. 10 illustrates the rod 54 positioned close to one of the louvres 42 when the louvres 42 are fully open, whereas FIG. 11 shows the rod 54 and the same louvre 42 spaced farther apart due to the louvres 42 being in an intermediate position. While the louvres 42 may be adjusted via the rotary dial 68 to alter airflow through the assembly 30, the biasing member 52 remains in the biased state and able to be released should there be a thermal event.

[0045] In addition to the configurations described above, the air register assembly 30 may alternatively employ a different type of biasing member and arrangement to achieve the same functional objective of closing the louvres 42 in response to the thermal event. While the previous embodiment includes the biasing member 52 being held in the biased state by the finger 66 of the retention device 48, an additional and illustrative embodiment is shown in FIG. 13. Specifically, a biasing member 152 having a first end 74 and a second end 76 with the first end 74 coupled to a support base 146 (shown as a support base 246 in FIGS. 17-19) and the second end 76 coupled to the fuse 50 with the biasing member 152 maintained in the biased state by the fuse 50. The biasing member 152 may be in parallel with the fuse 50 such that the direction of expansion is parallel with the length of the fuse 50 as shown in FIGS. 13-16. It should be appreciated that the biasing member 152 could be arranged differently than what is shown in the Figures. For example, the direction of expansion may be perpendicular to the fuse 50 or in an angle relative to the fuse 50. The biasing member 152 being directly coupled to the fuse 50 (and / or directly engaging the fuse 50) may help in reducing the number of intermediate components, which may help in durability and / or cost of the assembly 30.

[0046] Similarly to FIGS. 1-12, FIG. 13 includes the rod 54 being operatively coupled to the frame 32 with the fuse 50 releasing the biasing member 152 into the unbiased state when the fuse 50 activates. The biasing member 152 then drives the rod 54 against the adjustment lever 44 or one of the louvres 42 such that the louvres 42 are moved into the closed position for restricting airflow through the air duct during the thermal event. The rod 54 may further include a proximal end 78 and a distal end 80 with the proximal end 78 coupled to the second end 76 of the biasing member 152 and the distal end 80 engaging the adjustment lever 44 or one of the louvres 42.

[0047] The assembly 30 may further include an adjuster 164 to allow the user to manually adjust the position of the louvres 42. FIG. 14 shows the louvres 42 in an intermediate position between the open and closed positions. The adjuster 164 is moved to the right, which causes the adjustment lever 44 to move further away from the distal end 80 of the rod 54, which progressively closes the louvres 42. As mentioned above, the biasing member 152 remains in the biased state during adjustment of the louvres 42, which allows the assembly 30 to have dual functionality of everyday airflow control and emergency operation during the thermal event.

[0048] In response to the thermal event, the biasing member 152 is released into the unbiased state to ultimately close the louvres 42, which is shown in FIG. 15. The fuse 50 is activated and is not shown in FIG. 15, which permits the biasing member 152 to transition into the unbiased state. As the biasing member 152 transitions from the biased state to the unbiased state, the biasing member 152 (or more specifically, the second end 76 of the biasing member 152), directly engages the rod 54 when the fuse 50 activates during the thermal event. This causes the second end 76 of the biasing member 152 to push the rod to the right (as shown in FIG. 15) wherein the distal end 80 of the rod 54 engages the adjustment lever 44 to close the louvres 42. As shown in FIG. 16, the rod 54 may further include a first rail 82 and a second rail 84, which create a channel for the adjustment lever 44 to move within. The adjustment lever 44 can be in the channel and be nearer to the distal end 80 of the rod 54 when the louvres 42 are in the fully open position as shown in FIG. 13. Alternatively, the adjustment lever 44 can be in the channel and further away from the distal end 80 of the rod 54 when the louvres 42 are in an intermediate position as shown in FIG. 14. In other words, the channel provides space for the adjustment lever 44 to move while remaining within the channel as the user manually adjusts the position of the louvres 42. It should be appreciated that FIGS. 13-16 are illustrative and the specific shapes, dimensions, and arrangements shown are not intended to limit scope, and actual designs may vary based on application requirements, manufacturing considerations, and aesthetic preferences.

[0049] As previously discussed, it is important that the louvres remain continuously closed to prevent further spread of heat, smoke, or flames through the ventilation system. As such, the rod 54 is continuously driven against the adjustment lever 44 or one of the louvres 42 by the biasing member 152 to continuously hold the louvres 42 in the closed position during the thermal event. As shown in FIG. 15, the distal end 80 of the rod 54 continuously engages the adjustment lever 44 to continuously keep the louvres 42 in the closed position. This continuous engagement helps counteract any forces that might otherwise cause the louvres 42 to reopen, such as thermal expansion, vibration, or pressure changes within the ductwork. The continuous pressure additionally helps ensure that the louvres42 remain closed even if other components experience stress or deformation under high temperatures.

[0050] Additionally, the assembly 30 may alternatively include a linkage system 86 with the rod 54 coupled to the frame 32 through the linkage system 86, which is shown in FIGS. 17-19. Specifically, FIGS. 17-19 show the linkage system 86 having a four-bar linkage system, which includes a fixed frame 88 coupled to the frame 32, an input link 90 coupled to the proximal end 78 of the rod 54, which receives an input motion, and an output link 92 coupled to the distal end 80 of the rod 54, which delivers an output motion. Typically, a four-bar linkage system would have a coupler link, which in FIGS. 17-19 is represented as the rod 54 because the rod 54 connects the input link 90 and the output link 92 and facilitates the transfer of energy from the input link 90 to the output link 92.

[0051] FIGS. 17-19 further include the rotary dial 68, which allows the user to adjust the louvres 42 by rotating the rotary dial 68 without affecting the state of a biasing member 252. When the rotary dial 68 is turned counterclockwise, the louvres 42 progressively move toward the closed position. As the louvres 42 close, the louvre 42 designed to interact with the distal end 80 of the rod 54 is moved farther away from the distal end 80. For example, FIG. 17 illustrates the rod 54 positioned in close proximity to one of the louvres 42 when the louvres 42 are fully open, whereas FIG. 18 shows the rod 54 and the same louvre 42 spaced farther apart because the louvres are in an intermediate position. While the louvres 42 may be adjusted via the rotary dial 68 to alter airflow through the assembly 30, the biasing member 252 remains in the biased state and able to be released should there be a thermal event.

[0052] In response to the thermal event, the biasing member 252 is released into the unbiased state to ultimately close the louvres 42, which is shown in FIG. 19. The fuse 50, which is depicted as being in series with the biasing member 252, activates and allows the biasing member 252 to transition into the unbiased state. As the biasing member 252 expands, the second end 76 of the biasing member 252 pushes the proximal end 78 of the rod 54, which is coupled to the input link 90, causing the proximal end 78 to move down and to the right as shown in FIG. 19. The downward and rightward motion of the proximal end 78 of the rod 54 is transferred to the output link 92, which is coupled to the distal end 80 of the rod 54. As the distal end 80 of the rod 54 moves to the right, the distal end 80 engages with one of the louvres 42 and moves the louvres into the closed position to restrict airflow during the thermal event. It should be appreciated that FIGS. 17-19 are illustrative and the specific shapes, dimensions, and arrangements shown are not intended to limit scope, and actual designs may vary based on application requirements, manufacturing considerations, and aesthetic preferences.

[0053] As previously discussed, it is important that the louvres remain continuously closed to prevent further spread of heat, smoke, or flames through the ventilation system. As such, the rod 54 is continuously driven against the adjustment lever 44 or one of the louvres 42 by the biasing member 252 to continuously hold the louvres 42 in the closed position during the thermal event. As shown in FIG. 19, the second end 76 of the biasing member 252 continuously engages the proximal end 78 of the rod 54, which keeps the distal end 80 of the rod 54 engaged with one of the louvres 42 to continuously keep the louvres 42 in the closed position. This continuous engagement helps counteract any forces that might otherwise cause the louvres 42 to reopen, such as thermal expansion, vibration, or pressure changes within the ductwork. The continuous pressure additionally helps ensure that the louvres 42 remain closed even if other components experience stress or deformation under high temperatures.

[0054] Embodiments discussed herein are not intended to be exhaustive or limit the disclosure to any particular form. The terminology which has been used is intended to be in the nature of words of description rather than of limitation. Many modifications and variations are possible in light of the above teachings and the disclosure may be practiced otherwise than as specifically described.

Examples

Embodiment Construction

[0027]Referring to the Figures, wherein like numerals indicate like or corresponding components throughout the several views, an air register assembly 30 (also referred to as an air duct register) for use with an air duct to restrict airflow during a thermal event is shown.

[0028]Air registers are a common feature in houses and commercial buildings. Their primary purpose is to allow heated or cooled air to enter a given room from the ductwork. Air registers often include adjustable louvres (also referred to as dampening louvres) that let users control the direction and volume of airflow for better comfort or circulation.

[0029]Referring to FIG. 1, the air register assembly 30 is shown having a frame 32 with an interior side 34 facing the air duct and an exterior side 36 facing away from the air duct. The assembly 30 also includes a plurality of louvres 42 mounted to the frame 32, which are moveable between a plurality of open positions and a closed position. The plurality of open posi...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The subject application claims priority to and all the benefits of U.S. Provisional Patent Application No. 63 / 725,918 , filed Nov. 27, 2024, the disclosure of which is incorporated by reference in its entirety herein.FIELD OF DISCLOSURE

[0002] The subject disclosure generally relates to an air register assembly.BACKGROUND

[0003] Air registers assemblies are used to regulate airflow into a room or space and typically include adjustable louvres that allow a user to control the volume and direction of airflow. Typical air registers often lack mechanisms to respond automatically to hazardous conditions, such as a thermal event caused by fire or overheating within the ductwork. Air register assemblies that do include mechanisms to respond to hazardous conditions are often complicated and expensive. Therefore, there is a need in the art for an air register assembly that is cost-effective and can respond to hazardous conditions.SUMMARY

[0004] The subject disclosure provides for an air register assembly for use with an air duct to restrict airflow during a thermal event. The air register assembly includes a frame having an interior side and an exterior side with the interior side facing the air duct. The air register assembly further includes a plurality of louvres mounted to the frame and moveable between a plurality of open positions and a closed position. The air register assembly further includes an adjustment lever mounted to the frame to adjust the louvres between the open and closed positions. The air register assembly further includes a support base coupled to the frame, a retention device mounted to the support base with the retention device having a fuse. The air register assembly further includes a biasing member coupled to the frame and maintained in a biased state by the retention device and a rod operatively coupled to the frame wherein the retention device releases the biasing member into an unbiased state when the fuse activates with the biasing member driving the rod against the adjustment lever or one of said louvres such that the louvres are moved into the closed position for restricting airflow through the air duct during a thermal event.

[0005] The subject disclosure also provides for an air register assembly for use with an air duct to restrict airflow during a thermal event. The air register assembly includes a frame having an interior side and an exterior side with the interior side facing the air duct. The air register assembly further includes a plurality of louvres mounted to the frame and moveable between a plurality of open positions and a closed position. The air register assembly further includes an adjustment lever mounted to the frame to adjust the louvres between the open and closed positions. The air register assembly further includes a support base coupled to the frame, a fuse, and a biasing member having a first end and a second end with the first end coupled to the support base and the second end coupled to the fuse with said biasing member maintained in a biased state by the fuse. The air register assembly further includes a rod operatively coupled to said frame wherein the fuse releases the biasing member into an unbiased state when the fuse activates with the biasing member driving the rod against the adjustment lever or one of the louvres such that the louvres are moved into the closed position for restricting airflow through the air duct during a thermal event.BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings.

[0007] FIG. 1 is a perspective view of an air register assembly.

[0008] FIG. 2 is a side view of the air register assembly with a plurality of louvres in an open position.

[0009] FIG. 3 is a side view of the air register assembly with the plurality of louvres between the open position and a closed position.

[0010] FIG. 4 is a side view of the air register assembly with a fuse activated and the plurality of louvres moved into the closed position by a rod driven by a biasing member.

[0011] FIG. 5 is a partial bottom view of the air register assembly with the plurality of louvres in the open position.

[0012] FIG. 6 is a partial exploded view of the air register assembly.

[0013] FIG. 7A is a side view of the air register assembly with the fuse disposed in an alternate configuration and the plurality of louvres in the open position.

[0014] FIG. 7B is bottom partial sectional view of the air register assembly with the fuse disposed in another configuration with the plurality of louvres in the open position.

[0015] FIG. 8 is a side view of the air register assembly shown in FIG. 7A with the louvres between the open and closed positions.

[0016] FIG. 9 is a side view of the air register assembly shown in FIG. 7A with the fuse activated and the plurality of louvres moved into the closed position by the rod driven by the biasing member.

[0017] FIG. 10 is a side view of the air register assembly with the rod configured to directly engage one of the louvres and the louvres in the open position.

[0018] FIG. 11 is a side view of the air register assembly shown in FIG. 10 with the plurality of louvres between the open and closed positions.

[0019] FIG. 12 is a side view of the air register assembly shown in FIG. 10 with the fuse activated and the plurality of louvres moved into the closed position by the rod driven by the biasing member.

[0020] FIG. 13 is a side view of the air register assembly according to a second embodiment with the plurality of louvres in the open position.

[0021] FIG. 14 is a side view of the air register assembly shown in FIG. 13 with the plurality of louvres between the open and closed positions.

[0022] FIG. 15 is a side view of the air register assembly shown in FIG. 13 with the fuse activated and the plurality of louvres moved into the closed position by the rod driven by the biasing member.

[0023] FIG. 16 is a partial bottom view of the air register assembly shown in FIG. 13.

[0024] FIG. 17 is a side view of the air register assembly with the fuse in another configuration and the plurality of louvres in the open position.

[0025] FIG. 18 is a side view of the air register assembly shown in FIG. 17 with the plurality of louvres between the open and closed positions.

[0026] FIG. 19 is a side view of the air register assembly shown in FIG. 17 with the fuse activated and the plurality of louvres moved into the closed position by the rod driven by the biasing member.DETAILED DESCRIPTION

[0027] Referring to the Figures, wherein like numerals indicate like or corresponding components throughout the several views, an air register assembly 30 (also referred to as an air duct register) for use with an air duct to restrict airflow during a thermal event is shown.

[0028] Air registers are a common feature in houses and commercial buildings. Their primary purpose is to allow heated or cooled air to enter a given room from the ductwork. Air registers often include adjustable louvres (also referred to as dampening louvres) that let users control the direction and volume of airflow for better comfort or circulation.

[0029] Referring to FIG. 1, the air register assembly 30 is shown having a frame 32 with an interior side 34 facing the air duct and an exterior side 36 facing away from the air duct. The assembly 30 also includes a plurality of louvres 42 mounted to the frame 32, which are moveable between a plurality of open positions and a closed position. The plurality of open positions includes any position between the fully open position and the closed position, excluding the closed position itself. For example, FIG. 2 shows the louvres 42 in the fully open position, while FIG. 3 depicts the louvres 42 in an intermediate position. Both positions are considered part of the plurality of open positions. The assembly 30 further includes an adjustment lever 44 mounted to the frame 32, which is used to adjust and move the louvres 42 between the open and closed positions. The assembly 30 may further include a faceplate 38 defining the exterior side 36 with the faceplate 38 having a plurality of slits 40 (shown in FIG. 1). It should be appreciated that the term frame may include the frame 32, faceplate 38, and slits 40. The slits 40 are openings or gaps in the faceplate 38 allowing for air to pass through them and may include angles for each opening. It should be appreciated that the faceplate 38 and slits 40 shown in the Figures are illustrative and may look different in practice. The configuration, size, orientation, and pattern of the slits 40 may vary based on functional requirements such as airflow optimization, acoustic performance, and thermal management, as well as aesthetic considerations to complement the surrounding environment. Alternative designs may include different geometries, decorative elements, or materials to achieve the desired balance between performance and visual appeal.

[0030] Similarly, the frame 32, louvres 42, and adjustment lever 44 can be of any suitable shape, size or configuration depending on the design, performance, and / or aesthetic requirements. For example, the adjustment lever 44 may be as shown in FIG. 1, slidably coupled to an adjuster 64 (through a rod 54) disposed on the faceplate 38 of the frame 32. Alternatively, the adjustment lever 44 may be as shown in FIG. 10, coupled to a rotary dial 68 or rotary control. Additionally or alternatively, the assembly 30 may include a single louvre or a greater number of louvres than those illustrated in the Figures, with the number of louvres being determined by the requirements of the specific air duct application.

[0031] While air registers are designed to provide users with adjustable control over airflow direction and volume to enhance comfort and circulation, they can also inadvertently act as a pathway for a thermal event, such as a fire, to spread within a building. Fires may spread through air registers via the ductwork because these components create a continuous pathway between rooms and floors. When a fire ignites in one area of a building, the intense heat causes air to rise, creating convection currents that can carry smoke, hot gases, and even small embers through the HVAC ductwork. The air registers provide direct access for hot gases and embers to enter adjacent spaces, especially if the louvres are open. The mechanism and specific components that allow the air register assembly 30 to close the louvres 42 in response to the thermal event will be discussed in detail below.

[0032] With continuing reference to FIG. 1, the assembly 30 further includes a support base 46 coupled to the frame 32 and a retention device 48 (also referred to as a spring-loaded lever system) mounted to the support base 46 with the retention device 48 including a fuse 50 (also referred to as a temperature-sensitive actuator). The support base 46 and retention device 48 are physical components of the assembly 30 that help hold the fuse 50 in place. The support base 46 and retention device 48 may be shaped and configured differently depending on the application. One implementation may include the retention device 48 having a retention arm 62 pivotably coupled to the support base 46 and engaging the fuse 50 and the frame 32 to maintain a biasing member 52 (also referred to as a spring) in a biased state. It should be appreciated that the specific size, shape, and arrangement of the support base 46 and retention device 48 (which may include the retention arm 62) may be customized to fit the specific need for the given application.

[0033] The fuse 50 is a heat-sensitive component designed to activate in response to a thermal event, such as a fire. A fuse activates by responding to an external event (such as the aforementioned thermal event) and undergoes a physical change that releases a mechanical restraint. For example, if the fuse 50 is designed with a material such as eutectic alloy, the alloy will melt or deform at a specific temperature. When the fuse 50 activates, the fuse 50 mechanically releases the retention device 48, which then ultimately closes the plurality of louvres 42, as will be described in greater detail below.

[0034] The fuse 50 may be a fusible link configured to melt at a predetermined and calibratable temperature (e.g., approximately 165° F.). Alternative fuse types may include the aforementioned heat-activated mechanical fuses utilizing eutectic alloys but may further include bi-metallic thermal fuses employing a bi-metal strip that bends when heated, and glass tube thermal fuses, which are commonly used in electronics but may be adapted for thermal activation in HVAC applications. The selection of the fuse type may depend on factors such as the desired activation temperature, environmental conditions, and / or regulatory requirements.

[0035] The placement of the support base 46, retention device 48, and fuse 50 within the assembly 30 may affect the time it takes for the fuse 50 to activate. Positioning the fuse 50 in the airflow pathway, as illustrated in FIG. 7B, allows the fuse 50 to be directly exposed to the heat and hot gases generated by the thermal event within the ductwork. This direct exposure may help the fuse 50 reach its activation temperature quicker, minimizing any delay in closing the louvres 42 to prevent further spread of the fire. The placement of the support base 46, retention device 48, and fuse 50 can vary depending on space constraints, airflow patterns, and accessibility requirements within the specific air register design.

[0036] The air register assembly 30 further includes the biasing member 52 coupled to the frame 32 and maintained in the biased state by the retention device 48, which is shown in FIG. 2 in a side view and can further be seen in an exploded view in FIG. 6. The biasing member 52 is operatively coupled to the frame 32. As mentioned above, when the fuse 50 activates in response to the thermal event, the retention device 48 releases the biasing member 52 into an unbiased state. The biasing member 52 drives the rod 54 against the adjustment lever 44 or one of the louvres 42 such that the louvres 42 are moved into the closed position for restricting airflow through the air duct during the thermal event. The specifics of the louvres 42 being moved closed and how the retention device 48 releases the biasing member 52 will be discussed in greater detail below.

[0037] The biasing member 52 may be implemented using various types of springs, such as compression springs, extension springs, torsion springs, and / or constant-force springs, depending on the desired motion and force characteristics. Several attributes are considered when choosing the type of spring including spring rate (stiffness), travel distance, material composition, and temperature tolerance. For example, the spring must exert sufficient force to overcome friction and reliably drive the rod 54 to close the louvres 42, while also fitting within the available space in the assembly 30. Materials for the biasing member 52, such as stainless steel or other high-temperature alloys, may help enhance durability and heat resistance during a thermal event. Additional factors such as fatigue resistance and compliance with fire safety standards also may influence the type and material of a given biasing member. These considerations allow the biasing member 52 to be tailored for optimal performance under the specific conditions of the intended installation.

[0038] The biasing member 52 may also be coupled to the frame 32 in different locations within the assembly 30. For example, FIGS. 1-12 show the assembly 30 further including a housing 56 mounted to the frame 32 and a piston 58 disposed within the housing 56. The biasing member 52 is disposed within the housing 56 to continuously bias the piston 58 so that the piston 58 engages the rod 54 when the biasing member 52 is released into the unbiased state. However, the housing 56 may be mounted to the frame 32 in different locations depending on the specific application. When determining the placement of the housing 56 within the assembly 30, several factors may be considered such as the available space within the frame 32, the required motion path of the rod 54, and the desired point of engagement with either the adjustment lever 44 (as shown in FIG. 2) or one of the louvres 42 (as shown in FIG. 10). By evaluating such factors, the housing 56 can be strategically located to balance performance, durability, and ease of installation for the specific application.

[0039] As described above, the retention device 48 releases the biasing member 52 into the unbiased state after activation of the fuse 50. As shown in FIGS. 1-12, the retention device 48 may further include the retention arm 62, which may further include a finger 66. The finger 66 extends from the retention arm 62 to engage and hold the piston 58. As shown in FIGS. 4, 9, and 12, when the fuse 50 activates, the retention arm 62 is no longer braced by the fuse 50 and thereby allowed to pivot. The pivoting motion of the retention arm 62 frees the piston 58 and the coupled biasing member 52 from being held by the finger 66, which then permits the biasing member 52 to release into the unbiased state. The rod 54 may include an abutment 60 (shown in FIG. 5) and the piston 58 engages the abutment 60 when the biasing member 52 is in the unbiased state. In other words, as the piston 58 is moved toward and engages with the abutment 60, the rod 54 is driven into the adjustment lever 44 and forces a guide pin 70 on the adjustment lever 44 to travel along a slot 72 of the rod 54. This travel upward and to the right (as shown in FIG. 4) causes the louvres 42 to be moved into the closed position.

[0040] As mentioned above, the rod 54 may be driven directly against the louvres 42 (as opposed to against the adjustment lever 44), which can be seen in FIGS. 10-12. Specifically, FIG. 12 shows the fuse 50 activated with the retention arm 62 able to pivot thereby releasing the piston 58, which allows the rod 54 to be driven directly into the louvres 42 moving the louvres 42 into the closed position.

[0041] Throughout the thermal event, it is important that the louvres 42 remain continuously closed to prevent further spread of heat, smoke, or flames through the ventilation system. As such, the rod 54 is continuously driven against the adjustment lever 44 or one of the louvres 42 by the biasing member 52 to continuously hold the louvres 42 in the closed position during the thermal event. This allows the rod 54 to maintain constant pressure to counteract any forces that might otherwise cause the louvres 42 to reopen, such as thermal expansion, vibration, or pressure changes within the ductwork. The continuous pressure additionally helps ensure that the louvres 42 remain closed even if other components experience stress or deformation under high temperatures.

[0042] The air register assembly 30 further allows for manual adjustment of the louvres 42 while the biasing member 52 is maintained in the biased state. This is shown in FIGS. 3, 8, 11, 14, and 18. Allowing for manual adjustment separates the functionality of the assembly 30 into everyday airflow adjustment and restriction of airflow during the thermal event. For example, a user may want to adjust the louvres 42 to be closed halfway to regulate airflow for comfort or energy efficiency without affecting the state of the biasing member 52. This separation of functionality allows the assembly 30 to provide everyday usability while reserving the restriction of airflow for emergency situations.

[0043] To help facilitate this separation of functionality, the rod 54 may extend through the biasing member 52 and may move relative to the biasing member 52 during adjustment of the louvres 42, which can be seen in FIGS. 2-4, 7A, and 8-12. Additionally, a portion of the rod 54 may extend through the piston 58 and the housing 56. Specifically, FIG. 2 shows the louvres 42 in the open position with a portion of the rod 54 extending through the biasing member 52, piston 58, and the housing 56. The rod 54 extending through these components allows the louvres 42 to be manually adjusted without affecting the state of the biasing member 52. As the adjuster 64 is moved to the left, the guide pin 70 of the adjustment lever 44 is forced to slide to the upper right of the slot 72, which progressively closes the louvres 42. As the louvres 42 are moved into the closed position, the rod 54 slides partially out of the biasing member 52, piston 58, and housing 56. Conversely, as the adjuster 64 is moved to the right, the guide pin 70 of the adjustment lever 44 is forced to slide to the lower left of the slot 72, which opens the louvres 42. As the louvres 42 are moved into the open position, the rod 54 slides further (and possibly partially through) the biasing member 52, the piston 58, and the housing 56.

[0044] The assembly 30 may include the rotary dial 68 shown in FIGS. 10-12 and 17-19, which allows the user to adjust the louvres 42 without affecting the state of the biasing member 52. When the rotary dial 68 is turned counterclockwise, the louvres 42 progressively move to the closed position. As the louvres 42 close, the louvre 42 designed to interact with the rod 54 shifts farther away from the rod 54. For example, FIG. 10 illustrates the rod 54 positioned close to one of the louvres 42 when the louvres 42 are fully open, whereas FIG. 11 shows the rod 54 and the same louvre 42 spaced farther apart due to the louvres 42 being in an intermediate position. While the louvres 42 may be adjusted via the rotary dial 68 to alter airflow through the assembly 30, the biasing member 52 remains in the biased state and able to be released should there be a thermal event.

[0045] In addition to the configurations described above, the air register assembly 30 may alternatively employ a different type of biasing member and arrangement to achieve the same functional objective of closing the louvres 42 in response to the thermal event. While the previous embodiment includes the biasing member 52 being held in the biased state by the finger 66 of the retention device 48, an additional and illustrative embodiment is shown in FIG. 13. Specifically, a biasing member 152 having a first end 74 and a second end 76 with the first end 74 coupled to a support base 146 (shown as a support base 246 in FIGS. 17-19) and the second end 76 coupled to the fuse 50 with the biasing member 152 maintained in the biased state by the fuse 50. The biasing member 152 may be in parallel with the fuse 50 such that the direction of expansion is parallel with the length of the fuse 50 as shown in FIGS. 13-16. It should be appreciated that the biasing member 152 could be arranged differently than what is shown in the Figures. For example, the direction of expansion may be perpendicular to the fuse 50 or in an angle relative to the fuse 50. The biasing member 152 being directly coupled to the fuse 50 (and / or directly engaging the fuse 50) may help in reducing the number of intermediate components, which may help in durability and / or cost of the assembly 30.

[0046] Similarly to FIGS. 1-12, FIG. 13 includes the rod 54 being operatively coupled to the frame 32 with the fuse 50 releasing the biasing member 152 into the unbiased state when the fuse 50 activates. The biasing member 152 then drives the rod 54 against the adjustment lever 44 or one of the louvres 42 such that the louvres 42 are moved into the closed position for restricting airflow through the air duct during the thermal event. The rod 54 may further include a proximal end 78 and a distal end 80 with the proximal end 78 coupled to the second end 76 of the biasing member 152 and the distal end 80 engaging the adjustment lever 44 or one of the louvres 42.

[0047] The assembly 30 may further include an adjuster 164 to allow the user to manually adjust the position of the louvres 42. FIG. 14 shows the louvres 42 in an intermediate position between the open and closed positions. The adjuster 164 is moved to the right, which causes the adjustment lever 44 to move further away from the distal end 80 of the rod 54, which progressively closes the louvres 42. As mentioned above, the biasing member 152 remains in the biased state during adjustment of the louvres 42, which allows the assembly 30 to have dual functionality of everyday airflow control and emergency operation during the thermal event.

[0048] In response to the thermal event, the biasing member 152 is released into the unbiased state to ultimately close the louvres 42, which is shown in FIG. 15. The fuse 50 is activated and is not shown in FIG. 15, which permits the biasing member 152 to transition into the unbiased state. As the biasing member 152 transitions from the biased state to the unbiased state, the biasing member 152 (or more specifically, the second end 76 of the biasing member 152), directly engages the rod 54 when the fuse 50 activates during the thermal event. This causes the second end 76 of the biasing member 152 to push the rod to the right (as shown in FIG. 15) wherein the distal end 80 of the rod 54 engages the adjustment lever 44 to close the louvres 42. As shown in FIG. 16, the rod 54 may further include a first rail 82 and a second rail 84, which create a channel for the adjustment lever 44 to move within. The adjustment lever 44 can be in the channel and be nearer to the distal end 80 of the rod 54 when the louvres 42 are in the fully open position as shown in FIG. 13. Alternatively, the adjustment lever 44 can be in the channel and further away from the distal end 80 of the rod 54 when the louvres 42 are in an intermediate position as shown in FIG. 14. In other words, the channel provides space for the adjustment lever 44 to move while remaining within the channel as the user manually adjusts the position of the louvres 42. It should be appreciated that FIGS. 13-16 are illustrative and the specific shapes, dimensions, and arrangements shown are not intended to limit scope, and actual designs may vary based on application requirements, manufacturing considerations, and aesthetic preferences.

[0049] As previously discussed, it is important that the louvres remain continuously closed to prevent further spread of heat, smoke, or flames through the ventilation system. As such, the rod 54 is continuously driven against the adjustment lever 44 or one of the louvres 42 by the biasing member 152 to continuously hold the louvres 42 in the closed position during the thermal event. As shown in FIG. 15, the distal end 80 of the rod 54 continuously engages the adjustment lever 44 to continuously keep the louvres 42 in the closed position. This continuous engagement helps counteract any forces that might otherwise cause the louvres 42 to reopen, such as thermal expansion, vibration, or pressure changes within the ductwork. The continuous pressure additionally helps ensure that the louvres42 remain closed even if other components experience stress or deformation under high temperatures.

[0050] Additionally, the assembly 30 may alternatively include a linkage system 86 with the rod 54 coupled to the frame 32 through the linkage system 86, which is shown in FIGS. 17-19. Specifically, FIGS. 17-19 show the linkage system 86 having a four-bar linkage system, which includes a fixed frame 88 coupled to the frame 32, an input link 90 coupled to the proximal end 78 of the rod 54, which receives an input motion, and an output link 92 coupled to the distal end 80 of the rod 54, which delivers an output motion. Typically, a four-bar linkage system would have a coupler link, which in FIGS. 17-19 is represented as the rod 54 because the rod 54 connects the input link 90 and the output link 92 and facilitates the transfer of energy from the input link 90 to the output link 92.

[0051] FIGS. 17-19 further include the rotary dial 68, which allows the user to adjust the louvres 42 by rotating the rotary dial 68 without affecting the state of a biasing member 252. When the rotary dial 68 is turned counterclockwise, the louvres 42 progressively move toward the closed position. As the louvres 42 close, the louvre 42 designed to interact with the distal end 80 of the rod 54 is moved farther away from the distal end 80. For example, FIG. 17 illustrates the rod 54 positioned in close proximity to one of the louvres 42 when the louvres 42 are fully open, whereas FIG. 18 shows the rod 54 and the same louvre 42 spaced farther apart because the louvres are in an intermediate position. While the louvres 42 may be adjusted via the rotary dial 68 to alter airflow through the assembly 30, the biasing member 252 remains in the biased state and able to be released should there be a thermal event.

[0052] In response to the thermal event, the biasing member 252 is released into the unbiased state to ultimately close the louvres 42, which is shown in FIG. 19. The fuse 50, which is depicted as being in series with the biasing member 252, activates and allows the biasing member 252 to transition into the unbiased state. As the biasing member 252 expands, the second end 76 of the biasing member 252 pushes the proximal end 78 of the rod 54, which is coupled to the input link 90, causing the proximal end 78 to move down and to the right as shown in FIG. 19. The downward and rightward motion of the proximal end 78 of the rod 54 is transferred to the output link 92, which is coupled to the distal end 80 of the rod 54. As the distal end 80 of the rod 54 moves to the right, the distal end 80 engages with one of the louvres 42 and moves the louvres into the closed position to restrict airflow during the thermal event. It should be appreciated that FIGS. 17-19 are illustrative and the specific shapes, dimensions, and arrangements shown are not intended to limit scope, and actual designs may vary based on application requirements, manufacturing considerations, and aesthetic preferences.

[0053] As previously discussed, it is important that the louvres remain continuously closed to prevent further spread of heat, smoke, or flames through the ventilation system. As such, the rod 54 is continuously driven against the adjustment lever 44 or one of the louvres 42 by the biasing member 252 to continuously hold the louvres 42 in the closed position during the thermal event. As shown in FIG. 19, the second end 76 of the biasing member 252 continuously engages the proximal end 78 of the rod 54, which keeps the distal end 80 of the rod 54 engaged with one of the louvres 42 to continuously keep the louvres 42 in the closed position. This continuous engagement helps counteract any forces that might otherwise cause the louvres 42 to reopen, such as thermal expansion, vibration, or pressure changes within the ductwork. The continuous pressure additionally helps ensure that the louvres 42 remain closed even if other components experience stress or deformation under high temperatures.

[0054] Embodiments discussed herein are not intended to be exhaustive or limit the disclosure to any particular form. The terminology which has been used is intended to be in the nature of words of description rather than of limitation. Many modifications and variations are possible in light of the above teachings and the disclosure may be practiced otherwise than as specifically described.

Examples

Embodiment Construction

[0027]Referring to the Figures, wherein like numerals indicate like or corresponding components throughout the several views, an air register assembly 30 (also referred to as an air duct register) for use with an air duct to restrict airflow during a thermal event is shown.

[0028]Air registers are a common feature in houses and commercial buildings. Their primary purpose is to allow heated or cooled air to enter a given room from the ductwork. Air registers often include adjustable louvres (also referred to as dampening louvres) that let users control the direction and volume of airflow for better comfort or circulation.

[0029]Referring to FIG. 1, the air register assembly 30 is shown having a frame 32 with an interior side 34 facing the air duct and an exterior side 36 facing away from the air duct. The assembly 30 also includes a plurality of louvres 42 mounted to the frame 32, which are moveable between a plurality of open positions and a closed position. The plurality of open posi...

Claims

1. An air register assembly for use with an air duct to restrict airflow during a thermal event, said air register assembly comprising:a frame having an interior side and an exterior side with said interior side facing the air duct;a plurality of louvres mounted to said frame and moveable between a plurality of open positions and a closed position;an adjustment lever mounted to said frame to adjust said louvres between said open and closed positions;a support base coupled to said frame;a retention device mounted to said support base with said retention device having a fuse;a biasing member coupled to said frame and maintained in a biased state by said retention device; anda rod operatively coupled to said frame;wherein said retention device releases said biasing member into an unbiased state when said fuse activates with said biasing member driving said rod against said adjustment lever or one of said louvres such that said louvres are moved into said closed position for restricting airflow through the air duct during a thermal event.

2. The air register assembly of claim 1, wherein said rod is continuously driven against said adjustment lever or one of said louvres by said biasing member to continuously hold said louvres in said closed position during the thermal event.

3. The air register assembly of claim 1, wherein said biasing member remains in said biased state during adjustment of said louvres.

4. The air register assembly of claim 1, wherein said rod extends through said biasing member and moves relative to said biasing member during adjustment of louvres.

5. The air register assembly of claim 1, wherein said rod is slidably connected to said adjustment lever.

6. The air register assembly of claim 1, further comprising:a housing mounted to said frame; anda piston disposed within said housing;wherein said biasing member is disposed within said housing to continuously bias said piston and wherein said piston engages said rod when said biasing member is in said unbiased state.

7. The air register assembly of claim 6, wherein a portion of said rod extends through said piston and said housing.

8. The air register assembly of claim 6, wherein said rod has an abutment and said piston engages said abutment when biasing member is in said unbiased state.

9. The air register assembly of claim 1, wherein said retention device further includes a retention arm pivotably coupled to said support base and engaging said fuse and said frame to maintain said biasing member in said biased state.

10. The air register assembly of claim 1, wherein said frame includes a faceplate defining said exterior side of said frame with said faceplate having a plurality of slits.

11. An air register assembly for use with an air duct to restrict airflow during a thermal event, said air register assembly comprising:a frame having an interior side and an exterior side with said interior side facing the air duct;a plurality of louvres mounted to said frame and moveable between a plurality of open positions and a closed position;an adjustment lever mounted to said frame to adjust said louvres between said open and closed positions;a support base coupled to said frame;a fuse;a biasing member having a first end and a second end with said first end coupled to said support base and said second end coupled to said fuse with said biasing member maintained in a biased state by said fuse; anda rod operatively coupled to said frame;wherein said fuse releases said biasing member into an unbiased state when said fuse activates with said biasing member driving said rod against said adjustment lever or one of said louvres such that said louvres are moved into said closed position for restricting airflow through the air duct during a thermal event.

12. The air register assembly of claim 11, wherein said rod includes a proximal end and a distal end with said proximal end coupled to said second end of said biasing member and said distal end engaging said adjustment lever or one of said louvres.

13. The air register assembly of claim 11, wherein said biasing member directly engages said fuse.

14. The air register assembly of claim 11, wherein said biasing member directly engages said rod when said fuse activates during the thermal event.

15. The air register assembly of claim 11, further comprising a linkage system with said rod coupled to said frame through said linkage system.

16. The air register assembly of claim 11, wherein said biasing member is in parallel with said fuse.

17. The air register assembly of claim 11, wherein said biasing member is in series with said fuse.

18. The air register assembly of claim 11, wherein said rod is continuously driven against said adjustment lever or one of said louvres by said biasing member to continuously hold said louvres in said closed position during the thermal event.

19. The air register assembly of claim 11, wherein said biasing member remains in said biased state during adjustment of said louvres.

Images