Abstract: A variable-color region (886) extending to an exposed surface (102) at a surface zone (892) having a boundary (1212 or 1214) responds to an object (104) impacting the zone sufficiently hard to meet threshold impact criteria at an object-contact area (896) by changing color at a corresponding print area (898) or by providing an impact signal that causes color change at the print area if supplemental impact criteria are also met. In either case, a smoothened image of the print area is produced by determining a portion of the boundary where the print area is nearest the boundary, approximating at least that boundary portion as a smooth boundary vicinity curve, approximating the print area's perimeter, or a portion thereof nearest the boundary, as a smooth perimeter vicinity curve, and comparing the vicinity curves to determine if they meet or overlap.

Abstract: An impact indicator includes a housing configured to enable movement of a mass member from a first position to a second position in response to receipt by the housing of an acceleration event. The indicator also includes switch circuitry having a compressible switch element positionable between spaced apart contacts where the switch element is configured to be in spaced apart relationship to the mass member. A passive radio-frequency identification (RFID) module is coupled to the switch circuitry and, responsive to movement of the mass member from the first position to the second position, the mass member causes a positional change of the switch element relative to the first and second contacts, and the positional change causes a state change in the switch circuitry. The RFID module outputs a value based on the state of the switch circuitry when energized.

Abstract: Impact or acceleration sensor, which contains a liquid droplet and is designed such that the position and/or distribution of the liquid indicates whether an impact or any other acceleration of a predetermined minimum magnitude has occurred, includes: first and second foils, a cavity disposed between the foil faces of the foils and at least one retaining structure disposed on the foil face of the first and/or second foil and functions to maintain the liquid in a predetermined first sub-volume of the cavity. The retaining structure is a region of the first and/or second foil formed as a local elevation, depression or irregularity of the foil face, which forms a passable barrier for the wetting and/or contacting of the first and/or second foil by the liquid and defines an area piece of the foil face of the first and/or second foil corresponding to the first sub-volume.

Abstract: Impact indicators which include an impact registering structure are provided for a package. The impact registering structure registers a location and an elapsed time of an impact of excessive force on the package. The structure includes a first region, a second region, and a barrier film. The first region contains a first element, and the second region contains a second element. The first and second elements are selected to register the location and the elapsed time of the impact when coming in contact. The barrier film separates the first and second regions, and is calibrated to rupture with a specified impact force. Once ruptured, the first element and the second element contact, in part, to provide a location indication of the rupture in the barrier film and a time elapsed indication indicative of the elapsed time from the rupture in the barrier film.

Abstract: According to one aspect of the present disclosure, a device and technique for impact detection includes an impact indicator having a housing enclosing a detection assembly configured to detect an acceleration event. The indicator also includes switch circuitry and a radio-frequency identification (RFID) module coupled to the switch circuitry. Responsive to detecting the acceleration event, the detection assembly causes a change in the switch circuitry, wherein the change in the switch circuitry causes a change in a value output by the RFID module when activated. The indicator also includes logic configured to blockchain data output by the indicator.

Abstract: A safety rotor system for an aircraft including a flight rotor that is rotationally driven by a drive, the system including: a safety rotor that is rotationally driven during rotation of the flight rotor, the safety rotor including one or more safety members traversing a path outward of the flight rotor so that an object approaching the flight rotor through the path contacts one of the safety members before contacting the flight rotor, wherein the safety rotor decelerates when one of the safety members contacts an object; a sensor for detecting rotation of the safety rotor; and a controller configured to: determine, using the sensor, a deceleration of the safety rotor corresponding to one of the safety members contacting an object; and cause the rotation of the flight rotor to cease in response to detecting the deceleration of the safety rotor.

Abstract: Embodiments provide for an impact force gauge that includes a track and a shell that is designed to flex from a first state to a second state when a force exceeding a predetermined threshold is applied along a given axis and that is designed to return to the first state when the force falls below the predetermined threshold along the given axis. A roller is located in the shell and has a diameter such the roller is allowed or blocked from moving to different locations in the impact force gauge based on the force applied thereto. Based on the presence or absence of the roller along different portions of the track, the force gauge wirelessly transmits an indication of whether the force gauge has been exposed to a force that exceeds the predetermined threshold.

Abstract: An impact sensor has a hollow container with a spring extending therethrough. A liquid is present in the cavity. The spring biases opposing valve balls to a closed position, preventing dye that is located exterior of the cavity from entering the cavity. When a force applied to the sensor exceeds a first predetermined value, the spring is compressed or displaced, allowing at least one of the valve balls to move from the closed position to an open position, thereby allowing the dye at the moving valve ball to pass into the cavity, mixing with the liquid and providing a visual indication of the exceeded force upon the sensor.

Abstract: Disclosed is a package handling system comprising: an indicator designed to display a mishandling indication upon application of a force in excess of a predetermined threshold force.

Abstract: An automated aerial vehicle (AAV) and system for automatically detecting a contact or an imminent contact between a propeller of the AAV and an object (e.g., human, pet, or other animal) are described. A safety profile for the AAV may be selected based on various factors including a position or configuration of the AAV. When a contact or an imminent contact is detected, the selected safety profile may be executed to reduce or avoid any potential harm to the object and/or the AAV. For example, if a contact with a propeller of the AAV by an object is detected, the rotation of the propeller may be stopped to avoid harming the object. Likewise, an object detection component may be used to detect an object that is nearing a propeller, stop the rotation of the propeller, and/or navigate the AAV away from the detected object.

Abstract: A packaging material comprised of a gas-impermeable base layer, an indicator layer, and a gas-impermeable top layer is disclosed. The top layer is selected to rupture upon experiencing an impingement or impact that exceeds a predetermined threshold. The indicator layer is configured to change visual appearance upon exposure to ambient air. The top layer further may be configured into a plurality of cells, with each cell filled with a gas that is inert with respect to the indicator layer. The cells may be of a size and shape configured to indicate the location and shape of an impingement or impact, to alert a recipient of an item protected by the packaging material of an area that may require further inspection.

Abstract: The present disclosure relates to an integrated sensor system for monitoring, capturing, processing and analyzing data for delicate and fragile articles in real or near-real time movement within production, packaging and distribution systems. The system comprises a sensor platform that contains multiple on-board sensors detecting numerous force, environmental and movement variables; a handheld data receiver application in communication with said sensor module for issuing commands and processing captured data; and a web server application that is configured to receive information from one or more handheld data receiver applications and perform operations.

Abstract: The disclosure relates to materials and articles that provide an irreversible history of compression forces and torques experienced by the materials and articles. The disclosure relates more particularly to an multiple impact level detection assembly as well as related articles and methods. The multiple impact level detection assembly provides distinct impact patterns depending on the impact force and direction (for torqueing motions) received by the detection assembly. The detection assembly can be incorporated into a variety of articles and used in a variety of settings, for example to monitor personal safety in a protective garment such as a helmet. The detection assembly incorporates an impact detection medium (e.g., a plurality of microcapsules with an indicator therein), which can serve as an irreversible means for detecting impact on the assembly via a relief substrate incorporated into the assembly.

Abstract: There is provided a vehicle seat belt system including: webbing that has one end anchored to one seat width direction side surface of a vehicle seat or to a vehicle body, and that restrains an occupant seated in the vehicle seat; a retractor to which another end of the webbing is engaged and that is configured to take up the webbing, the retractor being provided with a pretensioner which, when activated, pulls in the webbing; a buckle, with which a tongue plate attached to the webbing can be engaged; a force limiter that allows the buckle to move to thereby reduce a tensile load acting on the webbing due to activation of the pretensioner; and a warning section that is configured to utilize movement of the buckle resulting from the force limiter to notify the occupant of an abnormality that the force limiter has been activated.

Abstract: The problem of detecting when a traumatic force has been sustained by the brain of an individual is solved by a shock detection device that can be installed in wearable equipment. The shock detection device can include one or more deformable supports that maintain at least one suspended weight at a specific location within a housing. When a shock of a pre-determined force is sustained by the equipment, the suspended weight and/or the one or more deformable supports will provide an indication that such a shock has occurred. Such indication can be a change in the position or state of the at least one suspended weight and/or the one or more deformable supports. Visual indicators can also be utilized to better signify when a sufficiently forceful shock has occurred.

Abstract: Disclosed is a package handling system comprising: an indicator designed to display a mishandling indication upon application of a force in excess of a predetermined threshold force.

Abstract: A variable-color region (106) of an information-presentation structure extends to an exposed surface (102) at a surface zone (112) and normally appears along it as a principal color. An impact-dependent portion (138) of the variable-color region responds to an object (104) impacting the zone at an object-contact area (116) by temporarily appearing along a print area (118) of the zone as generic changed color materially different from the principal color. The print area closely matches the object-contact area in size, shape, and location. The threshold impact criteria consist of multiple sets of different threshold impact criteria respectively associated with multiple specific changed colors materially different from the principal color. If the impact meets the threshold impact criteria, the generic changed color is the specific changed color for the criteria set met by the impact.

Abstract: Buckle assemblies having load indicating features and associated systems and methods are disclosed herein. In one embodiment, a buckle assembly includes a tang having an opening that receives a web to secure the buckle assembly to a vehicle or a seat structure. The tang also includes an elongate aperture and one or more deformable protrusions along the edge of the aperture. The tang is operably coupled to a buckle frame via a coupling member that extends through the aperture. Upon the application of a sufficient load to the tang, the coupling member deforms the protrusion(s), allowing the tang to move relative to the frame. Movement of the tang relative to the frame can move a colored load indicating region to a position that is visible through a window in a housing of the buckle assembly.

Abstract: A variable-color region (106) of a sports-playing structure of an information-presentation structure extends to an exposed surface (102) at a surface zone (112), normally appears along it as a principal color, and includes impact-sensitive and color-change components (182 and 184). A boundary line (1306/1308 or 1386/1388) extends along an in-bounds area (1302 or 1382) of the surface. A segment (192) of the impact-sensitive component responds to an object (104) impacting the zone at an object-contact area (116) by providing an impact effect if the impact meets threshold impact criteria. A segment (194) of the color-change component responds to the impact effect by causing an impact-dependent portion (138) of the region to temporarily appear along a print area (118) of the zone as changed color materially different from the principal color. The zone typically adjoins the boundary line or an internal line (1334 or 1396).

Abstract: System and methods for servicing and monitoring shock struts are provided. A shock strut servicing assistance system may comprise: a controller in electronic communication with a display; and a tangible, non-transitory memory configured to communicate with the controller, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the controller, cause the controller to perform operations comprising: calculating, by the controller, a dead volume of a shock strut and determining, by the controller, a first decision, the first decision being whether or not the dead volume of the shock strut is negative. A shock strut servicing assistance system may be for servicing a shock strut having a negative dead volume.

Abstract: A variable-color region (106) of a football-playing or baseball/softball-playing structure of an information-presentation structure extends to an exposed surface (102) at a surface zone (112) and normally appears along it as a principal color. An impact-dependent portion (138) of the variable-color region responds to an object (104) impacting the zone at an object-contact area (116) by temporarily appearing along a closely matching print area (118) of the zone as changed color materially different from the principal color. For football, the zone typically adjoins an end or side line (1446 or 1448) to help determine whether the object, typically a person's shoe, impacted the surface “in” or “out”. For baseball/softball, the zone typically adjoins a foul line (1506) to help determine whether the object, a baseball/softball, impacted the surface “fair” or “foul”.

Abstract: A variable-color region (106) of a tennis-playing structure of an information-presentation structure extends to an exposed surface (102) at a surface zone (112), normally appears along it as a principal color, and includes impact-sensitive and color-change components (182 and 184). A segment (192) of the impact-sensitive component responds to an object (104), typically a tennis ball, impacting the zone at an object-contact area (116) by providing an impact effect if the impact meets threshold impact criteria. A segment (194) of the color-change component responds to the impact effect by causing an impact-dependent portion (138) of the variable-color region to temporarily appear along a closely matching print area (118) of the zone as changed color materially different from the principal color. The zone adjoins a serviceline (34), the centerline (36), a sideline (30), or a baseline (28) to help determine whether a tennis ball impacted the surface “in” or “out”.

Abstract: A variable-color region (106) of an information-presentation structure extends to an exposed surface (102) at a surface zone (112) and normally appears along it as a principal color. An impact-dependent portion (138) of the variable-color region responds to an object (104) impacting the zone at an object-contact area (116) by temporarily appearing along a print area (118) of the zone as generic changed color materially different from the principal color. The print area closely matches the object-contact area in size, shape, and location. The colors are chosen to accommodate persons who are color blind. One of the principal and changed colors is usually restricted from being any color from green to red in the visible light spectrum or any color having a non-insignificant component of any color from green to red in the light spectrum for accommodating persons having the predominant red-green color blindness.

Abstract: This method makes it possible to characterize the seat of a railroad track through penetrometric and geo-endoscopic tests. It includes steps consisting of striking ram head of a light dynamic penetrometer to drive the tip of a train of rods into the seat, measuring the strength of the seat as a function of the pushing in depth of the train of rods, removing the train of rods from the seat, pushing a tube into a hole left by the train of rods, and sliding an image-recording camera inside the tube. The method includes additional automated steps consisting of measuring the position of the camera while it slides inside the tube, i.e., the dep that which the images are recorded, and couplingan analysis of the recorded images as a function of the depth with the strength measurements of the seat to characterize the different layers of the seat.

Abstract: An electronic device that enables identification of application of an impact is provided. The electronic device includes a module case including a first structure and a second structure having different deformation quantities, a first impact identification part formed between the first structure and the second structure and configured to generate a deformation according to the difference between the deformation quantities of the first and second structures at the time of applying the impact, and a second impact identification part that enables identification of whether the impact was applied based on the deformation of the first impact identification part.

Abstract: An impact indicator for sports equipment includes an indicating portion having an inner end disposed adjacent an attachment portion and an outer end closed by a sight glass. The indicating portion contains a first component and a second component that react with one another to produce a visual indication in response to an impact event that exceeds a predetermined threshold. The first component may be a first fluid and the second component may be a second fluid. The first fluid mixes with the second fluid in response to the impact event and causes a change in a physical property and/or appearance of a mixture of the first fluid and the second fluid that is visible through the sight glass from the exterior of the sports equipment.

Abstract: An impact indicator for impact detection and indication includes: a housing; and a detection assembly configured to detect receipt by the housing of an acceleration event. The detection assembly comprises first and second indicias displayable thereby, wherein the first indicia is displayed in an unactivated state of the impact indicator, and wherein in response to detecting the acceleration event, the second indicia is displayed, the second indicia further comprising an indication of a direction of the acceleration event.

Abstract: An impact detection apparatus according to one aspect of the present disclosure includes first and second detection portion, and connection portion. First and second detection portion each include solution container, solution absorption portion, mount-surface portion, and exterior portion. Solution container is configured to store colored solution therein, and has outlet enabling colored solution to flow out when being subjected to pressing force. Solution absorption portion is capable of absorbing colored solution that has flowed out from the outlet. Exterior portion is disposed on mount-surface portion, forms, together with mount-surface portion therebetween, housing space housing solution container and solution absorption portion, and has transparent portion.

Abstract: A sensor for detecting impact is generally provided. The sensor may include a deformable beam. The deformable beam may include a first end, a second end, and an elongated body extending therebetween. At least the second end is coupled to a support structure. Further, the deformable beam may be configured to bend from a first configuration to a deformed configuration when the sensor experiences an acceleration above a predetermined threshold.

Abstract: According to one aspect of the present disclosure, a device and technique for impact detection is disclosed. The impact indicator includes a housing and a mass member located within the housing. The housing is configured to enable movement of the mass member from a first position to a second position within the housing in response to receipt of an acceleration event by the housing. The impact indicator also includes a spring member disposed within the housing and configured to bias the mass member to the first position, and wherein in response to receipt by the housing of the acceleration event, the mass member is configured to overcome the bias and move from the first position to the second position. The mass member is configured to rotate within the housing in the second position to enable retention of the mass member in the second position.

Abstract: An impact indicator for impact detection and indication includes: a housing; and a detection assembly configured to detect receipt by the housing of an acceleration event. The detection assembly comprises first and second indicias displayable thereby, wherein the first indicia is displayed in an unactivated state of the impact indicator, and wherein in response to detecting the acceleration event, the second indicia is displayed, the second indicia further comprising an indication of a direction of the acceleration event.

Abstract: A perforating single-use impact indicator consisting of three independent engaging dements: a perforating sealed container: a sensitive dement; content consisting of a plurality of associated components. The sensitive element in the collar of the perforating sealed container operates as a plug on the perforating sealed container in such a way that the said sensitive element can be activated directly or indirectly when the components forming the content have been mixed or moved subsequent to the deceleration caused by an impact to the package to which the impact indicator of the invention is attached. The visual appearance of the sensitive element definitively changes when in direct contact with one of the components forming the content or when subjected to a change in temperature or to a gas release resulting from the mixing or movement of the components forming the content.

Abstract: According to one aspect of the present disclosure, a device and technique for impact detection and indication is disclosed. The device includes a housing and a detection assembly configured to detect receipt by the housing of an acceleration event. In response to detecting the acceleration event, the detection assembly causes a display element coupled to the housing to provide an encoded indication of impact status.

Abstract: A g-force-sensitive label for detecting and indicating the application of a g-force is provided, the g-force sensitive label comprising an area for detecting and indicating an application of a g-force above a threshold value on the g-force sensitive label and an attachment area for attaching the g-force sensitive label on an object. At least one physical property of the area measurably changes its state upon applying a g-force above the threshold value, thereby altering a displayed pattern such that a machine-readable 1D or 2D or alphanumeric code is displayed.

Abstract: An impact detection apparatus according to one aspect of the present disclosure includes first and second detection portion, and connection portion. First and second detection portion each include solution container, solution absorption portion, mount-surface portion, and exterior portion. Solution container is configured to store colored solution therein, and has outlet enabling colored solution to flow out when being subjected to pressing force. Solution absorption portion is capable of absorbing colored solution that has flowed out from the outlet. Exterior portion is disposed on mount-surface portion, forms, together with mount-surface portion therebetween, housing space housing solution container and solution absorption portion, and has transparent portion.

Abstract: An indicator for an impact detector includes a plurality of display parts to display a detector to outside of the indicator when an impact or force changes a condition of the detector. At least one of the plurality of display parts is a dummy display part. The impact detector can be disposed on a package of a packaging container.

Abstract: According to one aspect of the present disclosure, a device and technique for impact detection and indication is disclosed. The impact indicator includes a housing; a mass member located within the housing where the housing is configured to enable movement of the mass member from a first position to a second position within the housing in response to receipt by the housing of an acceleration event; and first and second biasing members disposed within the housing and biased toward each other to retain the mass member in the first position. In response to receipt by the housing of the acceleration event, the mass member is configured to overcome the biasing force of the first biasing member and move from the first position to the second position.

Abstract: A shock sensor includes: a supporting body; a bistable mechanism, configured to switch from a first stable mechanical configuration to a second stable mechanical configuration in response to an impact force applied along a detection axis and such as to supply to the bistable mechanism an amount of energy higher than a transition energy; and a detection device, coupled to the bistable mechanism and having a first state, when the bistable mechanism is in an initial stable mechanical configuration and a second state, after the bistable mechanism has made a transition from the initial stable mechanical configuration to a final stable mechanical configuration. The bistable mechanism includes at least one elastic element, constrained to the supporting body in at least two opposite peripheral regions and defining a first concavity in the first stable mechanical configuration and a second concavity, opposite to the first concavity, in the second stable mechanical configuration.

Abstract: An indicator assembly for an aircraft landing gear for providing indication of a hard landing. The indicator assembly including a actuator member movable when the pressure on a shock strut of the aircraft landing gear exceeds a desired load and stroke threshold indicative of a hard landing. A shear pin is coupled to the actuator member which is configured to shear when a desired level of force is applied to at least a portion of the shear pin. A visibly recognizable indictor is moved from a non-indicating position to an indicating position upon shearing of the shear pin.

Abstract: A device and technique for impact detection and indication includes a housing; a mass member located within the housing, the housing configured to enable movement of the mass member from a first position to a second position within the housing in response to receipt by the housing of an acceleration event; and first and second biasing members disposed within the housing and biased toward each other to retain the mass member in the first position. In response to receipt by the housing of the acceleration event, the mass member is configured to overcome the biasing force of the first biasing member and move from the first position to the second position, and wherein the first and second biasing members each comprises a leaf spring member having a length greater than a width of the mass member and disposed transversely to a direction of movement of the mass member.

Abstract: A dose counter for a metered dose inhaler includes a force sensor, an electronic controller, a memory for storing data indicative of a remaining number of doses and an electronic display device coupled to the controller for displaying the remaining number of doses. The dose counter is attached or integrated into a base of a canister containing medicament such that force applied to the base of the canister is registered by the force sensor, the controller being configured to measure force applied to the dose counter when depressing the canister and being responsive to measured force to decrement the remaining number of doses stored in the memory and shown on the display device.

Abstract: A system, method and apparatus in the detection of a scent to locate the damage and its extent and to aid in the repair manually or self-repair.

Abstract: A system, method and apparatus in the detection of a scent to locate the damage and its extent and to aid in the repair manually or self-repair. A method for detecting damage in a device including, providing at least one first microcapsule having at least two scents in a composition detectable by a machine, human, and/or animal or any combination thereof, associating the scent(s), where the scent(s) is a device, releasing the scent(s) when damage has occurred to the device, and detecting the scent(s) to alert a detector of the damage and level of the damage.

Abstract: A passive blast pressure sensor for detecting blast overpressures of at least a predetermined minimum threshold pressure. The blast pressure sensor includes a piston-cylinder arrangement with one end of the piston having a detection surface exposed to a blast event monitored medium through one end of the cylinder and the other end of the piston having a striker surface positioned to impact a contact stress sensitive film that is positioned against a strike surface of a rigid body, such as a backing plate. The contact stress sensitive film is of a type which changes color in response to at least a predetermined minimum contact stress which is defined as a product of the predetermined minimum threshold pressure and an amplification factor of the piston. In this manner, a color change in the film arising from impact of the piston accelerated by a blast event provides visual indication that a blast overpressure encountered from the blast event was not less than the predetermined minimum threshold pressure.

Abstract: A vehicle safety seat with mechanical shock indication includes a safety seat body defining a seat region for a child during vehicle travel and a mechanical shock indicator assembly mounted to the safety seat body for indicating that the child vehicle safety seat has suffered a mechanical shock of a least a predetermined magnitude.

Abstract: According to one aspect of the present disclosure, a device and technique for impact detection and indication is disclosed. The impact indicator includes a first member having a reservoir for holding an indicator fluid; a second member couplable to the first member; and a disc member disposed at least partially between the first and second members and extending over the reservoir. A capillary gap is formed at an interface between the disc member and a surface of the first member facing the disc member. Responsive to receiving a predetermined level of impact, the indicator fluid moves from the reservoir to the interface between the disc member and the first member and wicks into the capillary gap via capillary action, the indicator fluid disposed within the capillary gap providing a visual indication of the received predetermined level of impact.

Abstract: A helmet cover comprising an outer shell and a series of internal supports, wherein the helmet cover further comprises an outer shell comprised of a material designed to fracture at the location of an impact greater than a threshold impact, providing an indicator of the strength and location of the impact, and dispersing the force of the impact around the rigid shell of the helmet. The helmet cover further comprises a marker device adapted to release a marker when an impact greater than a threshold impact is realized on the helmet cover. The helmet cover is preferably a thermoplastic material which is not cellular in nature.

Abstract: According to one aspect of the present disclosure, a device and technique for impact detection and indication is disclosed. The impact indicator includes a first member having a reservoir for holding an indicator fluid; a second member couplable to the first member; and a disc member disposed at least partially between the first and second members and extending over the reservoir. A capillary gap is formed at an interface between the disc member and a surface of the first member facing the disc member. Responsive to receiving a predetermined level of impact, the indicator fluid moves from the reservoir to the interface between the disc member and the first member and wicks into the capillary gap via capillary action, the indicator fluid disposed within the capillary gap providing a visual indication of the received predetermined level of impact.

Abstract: According to one aspect of the present disclosure, a device and technique for impact detection is disclosed. The impact indicator includes a first member having a reservoir for holding an indicator fluid; and a second member couplable to the first member over the reservoir and configured to form a capillary gap between at least a portion of an interface between the first and second members. Responsive to receiving a predetermined level of impact, the indicator fluid moves from the reservoir to the interface between the first and second members and wicks into the capillary gap via capillary action, the indicator fluid disposed within the capillary gap providing a visual indication of the received predetermined level of impact.

Abstract: According to one aspect of the present disclosure, a device and technique for impact detection and indication is disclosed. The impact indicator includes a housing; a mass member located within the housing where the housing is configured to enable movement of the mass member from a first position to a second position within the housing in response to receipt by the housing of an acceleration event; and first and second biasing members disposed within the housing and biased toward each other to retain the mass member in the first position. In response to receipt by the housing of the acceleration event, the mass member is configured to overcome the biasing force of the first biasing member and move from the first position to the second position.