Patent Application
20190382088
This invention relates to automatic inflators for inflatable articles such as life rafts, life vests, and the like. More particularly, this invention relates to inflators that are actuated automatically upon immersion in water or manually.
Presently, there exists many types of inflators designed to inflate inflatable articles such as personal floatation devices (life vests, rings and horseshoes), life rafts, buoys and emergency signaling equipment. Manual inflators typically comprise a body for receiving the neck of a cartridge of compressed gas such as carbon dioxide. A reciprocating pierce pin is disposed within the body of the inflator for piercing the frangible seal of the cartridge to permit compressed gas therein to flow into a manifold assembly of the inflator and then into the article to be inflated. Typically, a manually movable firing lever is operatively connected to the pierce pin through the use of a pierce pin actuator such that the pierce pin pierces the frangible seal of the gas cartridge upon jerking of a ball lanyard tethered to the actuator. U.S. Pat. No. 3,809,288, the disclosure of which is hereby incorporated by reference herein, illustrates one particular embodiment of a manual inflator.
While manual inflators work suitably well, it was quickly learned that in an emergency situation, the person needing the assistance of the inflatable device, such as a downed aviator, injured person, or a man overboard, would fail or be unable to manually activate the inflator. Accordingly, it was realized that a means should be provided for automatically activating the inflator in such an emergency situation.
In response to this realized inadequacy of the prior art manual inflators, water-activated automatic inflators were developed which automatically actuate the pierce pin of the inflator when immersed in water thereby causing inflation of the inflatable device. Typical water-activated automatic inflators comprise a water activated actuator including a water destructible or dissolvable element often referred to as a “pill” positioned within a bobbin, which retains a spring-loaded actuator pin in a cocked position in alignment with the pierce pin. Upon exposure to water, the dissolvable pill contained within the bobbin immediately starts dissolving and then destructs altogether, whereupon it loses its ability to hold-back the spring-loaded actuator pin in its cocked position. The spring-loaded actuator pin is thus released to forcibly move from its cocked position to an actuated position to strike the pierce pin, either directly or indirectly by means of an intermediate transfer pin. Upon striking the pierce pin, the pin fractures the seal of the cartridge thereby allowing the gas contained therein to flow into the inflatable device to inflate the same.
Representative automatic actuators for inflators are disclosed in U.S. Pat. Nos. 3,059,814, 3,091,782, 3,426,942, 3,579,964, 3,702,014, 3,757,371, 3,910,457, 3,997,079, 4,223,805, 4,267,944, 4,260,075, 4,382,231, 4,436,159, 4,513,248, 4,627,823, 5,076,468, 5,601,124, 5,685,455, 5,562,233, 5,370,567, 5,333,756, 4,488,546 and 5,694,986, the disclosures of which are hereby incorporated by reference herein.
A disadvantage to automatic inflators employing a dissolvable pill is the tendency to prematurely destruct in non-emergency situations by exposure of the pill to excessive humidity in the air. Bobbin pills of various designs and chemical compositions have been used to minimize their susceptibility to humidity. Further, in most automatic inflators, the bobbin with its pill is replaceable so that the inflator may be rearmed periodically pursuant to a preplanned maintenance schedule to minimize the risk of premature actuation due to prolonged exposure to humidity. Along with the installation of a new, unspent gas cartridge, the replaceable feature of the bobbin also allows the automatic inflator to be rearmed with a new bobbin after firing upon submersion in water. In both scenarios, replacing the bobbin and if need be the spent gas cartridge allows the inflator to be repeatedly rearmed by the end user as needed over the course of many years. Indeed, rearm kits for most automatic inflators are readily available for sale to users at retail stores and online so that the users can rearm their automatic inflators whenever needed.
While replacement of bobbins in automatic inflators, and if need be the gas cartridge, allows the inflator to be in use for many years, it is sometimes desirable to design a “disposable” automatic inflator so as to be manufactured so economically with fewer components that it can simply be discarded after being fired or pursuant to the preplanned maintenance schedule instead of being rearmed with a rearm kit.
Prior art tethers for inflators (e.g., U.S. Pat. No. 3,809,288) typically comprise a tether assembly including a cord that was molded at one end in situ with the jerk handle. The trailing end of the cord would then operatively connected to the pierce pin actuator via crimped loop. The tether assemblies are typically manufactured in a specific lengths for each intended application.
Prior art manifold assemblies (e.g., U.S. Pat. No. 3,809,288) typically comprise a mounting flange heat-sealed to the inflatable article, with the inflator then sealingly connected thereto by a mounting bolt, which precludes easy replacement of the inflator for replacing the bobbin or for routine maintenance of the inflator.
Therefore, it is an object of this invention to provide an improvement which overcomes the aforementioned inadequacies of the prior art inflators and provides an improvement which is a significant contribution to the advancement of the disposable inflation art.
Another object of this invention is to provide an automatic inflator that is designed to be manufactured so economically for sale to users that it may be simply discarded and a new one installed.
Another object of this invention is to provide a user with an indicator that shows whether the disposable inflator has been fired.
Another object of this invention is to provide a disposable automatic inflator having a design that precludes or substantially impairs any attempted rearming of a spent inflator by the user and therefore requires the user to discard the spent inflator and purchase a new one.
Another object of this invention is to provide a disposable automatic inflator having a manifold assembly that allows a spent inflator to be easily removed by the user from the inflatable and once removed, not reinstalled, thereby assuring that the user replaces the spent inflator with a new one.
Another object of this invention is to provide a tether assembly for an inflator wherein an elongated member and a jerk handle are mold together in situ with the trailing end of the elongated member including barbed protuberances extending along its length (e.g., three) that, during assembly to the pierce pin actuator, could be progressively threaded through a hole in the actuator to the desired tether length with the exposed trailing end being trimmed off, thereby obviating the need to maintain an inventory of inflators with differently-length tethers.
Another object of this invention is to provide an assembly manifold for an inflator that facilitates easy replacement of the inflator or for routine maintenance of the inflator.
These objects should be construed to be merely illustrative of some of the more prominent features and applications of the intended invention. Many other beneficial results can be obtained by applying the disclosed invention in a different manner or by modifying the invention within the scope of the disclosure. Accordingly, other objects and a more comprehensive understanding of the invention may be obtained by referring to the summary of the invention, and the detailed description of the preferred embodiment in addition to the scope of the invention defined by the claims taken in conjunction with the accompanying drawings.
The invention is defined by the appended claims with the specific embodiment shown in the attached drawings. For the purposes of summarizing the invention, the invention comprises a disposable inflator composed of a minimal number of components that can be so economically manufactured to render it “disposable” after firing or pursuant to a maintenance schedule. Further, the design of the disposable inflator of the invention is such that rearming a spent inflator is rendered nearly impossible by a user to thereby minimize any attempt by the user to try to rearm it instead of disposing of it and installing a new one on the inflatable.
The invention further comprises a tether assembly for an inflator comprising an elongated member and a jerk handle mold together in situ with the trailing end of the elongated member including barbed protuberances extending along its length (e.g., three). During assembly to the actuator of the inflator, the barbed protrusions are progressively threaded through a hole in the actuator to the desired tether length. The exposed trailing end is then being trimmed off. The inventory of tether assemblies with different lengths of tethers is therefore minimized.
The invention further comprises a manifold assembly for an inflator that facilitates easy replacement of the inflator (or for routine maintenance) of the inflator is such a manner that the user may remove spent inflator and install a new one. In one embodiment of the manifold assembly, the spent inflator may be easily removed but not reinstalled, thereby assuring that the user actually installs a new inflator in its stead and does not simply reinstall the spent inflator.
The foregoing has outlined rather broadly, the more pertinent and prominent features of the present invention. The detailed description of the invention that follows is offered so that the present contribution to the art may be more fully appreciated. Additional features of the invention will be described hereinafter. These form the subject of the claims of the invention. It should be appreciated by those skilled in the art that the conception and the disclosed specific embodiment may be readily utilized as a basis for modifying or designing other methods and structures for carrying out the same purposes of the present invention. It should also be realized by those skilled in the art that such equivalent structures do not depart from the spirit and scope of the invention as set forth in the appended claims.
For a more succinct understanding of the nature and objects of the invention, reference should be directed to the following description taken in conjunction with the accompanying drawings in which:
Similar reference numerals refer to similar parts throughout the several figures.
Referring to
It is noted that the hood 26 protects the pill 22 in the bobbin 20 from splashes of water that might otherwise inadvertently cause unintended firing of the inflator 10. Hood 26 may include vent holes 26H to allow venting of the area underneath the hood 26 proximate to the bobbin 20 to assure that the bobbin 20 is rapidly flooded upon immersion. Hood 26 is preferably colored green to indicate an operable condition of the inflator 10. Hood 26 conceals the end of the inflator body 12 and bobbin 20 which may each or both be colored red that is exposed to view when the hood 26 is removed, thereby indicating a “spent” or inoperable condition.
It is noted that the hood 26 may not be simply reinstalled due to the fact that the forked end 30 moving inward toward the gas cartridge once the hood 26 is removed (explained in greater detail below) and is therefore not capable of re-grasping the inwardly-extending axial tab 28 of the hood 26. Indeed, if the user tries to reinstall the hood 26, it would simply fall off.
A tether assembly 38 is connected to an axial tab 40 via its hole 42 extending outwardly from the hood 26. According to this invention, the tether assembly 38 comprises simultaneously molding a jerk handle 39 with a flexible elongated member 41 having a plurality of barbed protrusions 43 extending along its length (e.g., three are shown). The barbed protrusions 43 are angled toward its trailing end and the flat portion faces the jerk handle 39. The angle portion allows the trailing end of the elongated member 41 to be inserted into the hole 42 and the barbed protrusion(s) 43 pulled through the hole 42 until the desired length is attained. The flat portion of the barbed protrusions 43 preclude the barbed protrusions 43 from being pulled back through the hole 42. When the desired length is attained, the exposed trailing end may be trimmed off. This feature obviates the need to maintain an inventory of inflators with differently-length tethers.
For manual operation, jerking on the tether 38 snaps the hood 26 off of the body 12 by pulling the inwardly-extending axial tab 28 of the hood 26 out from being grasped by the forked end 30 of the actuator 24, allowing the actuator 24 having a pierce pin 46 to be forcibly moved by a heavy spring 44 toward the gas cartridge to pierce the frangible seal of the gas cartridge.
For automatic operation, when the pill 22 dissolves upon submersion in water, the arms 36 of the bobbin 20 are allowed to pivot inwardly to expand the collective diameter of the radial seats 34, thereby releasing the ring seat 32 and allowing the actuator 24 to be forcibly moved by the heavy spring 44 toward the gas cartridge such that the pierce pin 46 pierces the frangible seal of the gas cartridge.
More particularly, as shown in
The housing 48 is rigidly affixed rotationally and axially within a longitudinal bore of the body 12 by a pair of spaced-apart dowels 52 that fit through corresponding slots 54 in a boss 56 extending from the end of the housing 48 and into corresponding holes 58 in the longitudinal wall of the body 12. The high-pressure spring 44 is compressed and positioned between the dowels 53 and an annular ledge 60 formed on the actuator 24, thereby constantly urging the actuator 24 toward the gas cartridge.
As best shown in
As best shown in
It is noted that when the inflator 10 is at rest, ready to be fired, the axial tab 28 of the hood 26 positioned between the forks 30A and 30B keeps their notches 82A and 82B in engagement with the inner annular seat 84 of the ring seat 32. At the same time, the radial seats 34 of the arms 36 of the bobbin 20 engage the outer seat 86 of the ring seat 32, thereby precluding any movement of the spring-loaded actuator 24 under the force of the spring 44.
However, as soon as the hood 26 is manually jerked off the inflator 10 via tether 38 during manual inflation, the axial tab 40 is removed from between the forks 30A and 30B. The flexibility of the forks 30A and 30B and the matching slopes 80S and 84S of the notches 80A and 80B and the inner portion of the seat 84, respectively, allows the forks 30A and 30B under the force of the spring 44 to be urged inwardly due to their respective slopes 80S and 84S to fully disengage the forked end 30, whereupon the force of the spring 44 drives the actuator 24 to force its pierce pin 46 into the frangible seal of the gas cartridge.
Similarly, during automatic inflation during immersion of the inflator 10 into water to dissolve the pill 22, the arms 36 of the pill 22 are forced outwardly under the force of the spring 44 due to the matching slopes 86S of the outer seat 86 of the ring seat 32 and the inner slope 34S of the radial seats 34. Outward movement of the arms 36 fully releases ring seat 32, whereupon the force of the spring 44 drives the actuator 24 to force its pierce pin 46 into the frangible seal of the gas cartridge.
As shown in
A pair of clips 110 extending downwardly from opposing outer sides of the square boss 96 include barbed projections 102 that engage into corresponding notches 104 in the opposing outer sides of the square boss 92 to seal the female opening 98 in fluid communication with the male boss 92.
After firing, the spent inflator 10 may be removed by a user through the use of a removal key 106. As best shown in
Optionally to preclude reuse of the removal key 106, the opposing arms 108 may each include a retention barb 110B such that upon installation to remove the spent inflator 10, the retention barbs 110 keep the key 106 in place between the clips 110 on the inflator body 12. The removal key 106 is therefore rendered non-reusable because it cannot be removed from the spent inflator 10. Correspondingly, the spent inflator 10 is rendered non-reusable due to the fact that the non-removable key 106 keeps the distance between the clips 110 too far apart such that their barbed projections 102 cannot engage their respective notches 104. Indeed, if the user tries to re-install the spent inflator 10, it would simply fall off.
It is anticipated that the non-reusable removal key 106 would be colored red to indicate the inoperable condition of the spent inflator 10. It is envisioned that each new disposable inflator 10 would be sold with a removal key 106 facilitating the removal of the spent inflator 10 by the user from the manifold 88 molded to the inflatable. The new disposable inflator 10 could then be installed onto the manifold 88.
As shown in
Upon firing of the inflator 10, the red-colored ledge 60 compresses the green-colored indicator 112 from its original uncompressed position shown in
To preclude the compressible colored indicator 112 from potentially being lodged in the window 114 upon firing, the colored indicator 112 is preferably recessed from the window 114. However, when the colored indicator 112 is so recessed, it no longer seals off the window 114 to prevent water from entering the inflator 10 via the window 114. As shown in
The lens 120 comprises an arcuate portion 122 configured and dimensioned to closely fit over the window 114 to seal therewith. The lens 120 is retained in position over the window 114 by opposing arms 122 each with protrusions 124 extending radially inward. The arms 122 are configured fit into corresponding slots 126 formed in the inflator body 12 at opposing sides of the window 114. The inwardly-extending protrusions 124 are configured to snap-fit into corresponding indentations 128 formed in the bottoms of the slots 126, thereby securing the lens 120 into position over the window 114.
In a second embodiment of the manifold assembly 16 is shown in
To secure the inflator 10 to the manifold 130, the user aligns the female opening 98 with the male boss 136 and mates the two, whereupon the vertical lug portion 148 slides into the vertical notch 142. The user then rotates the inflator 10 about one-eighth of a turn whereupon the tab 150 moves rotationally into the arcuate notch 144, thereby securing the inflator 10 to the inflator 130.
The inflator body 12 comprises a pair of opposing resilient arcuate arms 152 extending from their respective lugs 146. The end of each arm 152 includes a lock protrusion 154. The curve of the arcuate arms 152 and their lock protrusions 154 are configured and dimensioned such that the lock protrusions 154 engage the top surface of the wall 138 of the manifold 130 then resiliently flex toward the inflator body 12 as the female opening 98 is pushed onto the male boss 136 of the manifold 130. As the inflator 10 is rotated about one-eighth of a turn, the lock protrusions 154 slide off the top surface of the wall 138 and snap into the vertical notch 144 of the manifold 130. The lock protrusions 154 therefore prevent any counter-rotation of the inflator 10 relative to the manifold 130. The inflator 10 is thus secured to the manifold 130 and cannot be removed by the user without a removal tool because counter-rotation is precluded by the lock protrusions 154.
After firing or replacing the inflator 10, the spent inflator 10 may be removed by the user through the use of a removal key 160. As shown in
To use the removal key 160, the key 160 is inserted by the user around the inflator body 12 with the legs 164 straddling the inflator body 12 and with the foot portions 166 hooking under the respective lock protrusions 154. A large recess 168 is provided on the other side of the inflator body 12 to assure sufficient clearance for the hooking-under. Once hooked under, the removal key 160 is pivoted away from the cartridge end of the inflator 10 such that the heel 166H of the foot 166 fulcrums against the upper surface of the manifold 130 (e.g., the circular flange 132) to lift the lock protrusions 154 upwardly above or level to the upper surface of the wall 138 allowing the key 130 to be counter-rotated by the user.
A small recess 170 may be provided on the other side of the inflator body 12 to retain the now-pivoted key 160. The inflator 10 may be counter-rotated one-eighth of a turn because the lock protrusions 154 are un-snapped from the vertical notch 144. Once counter-turned, the inflator 10 may be removed from the manifold 130.
Each foot portion 166 may optionally include a retention barb 168 extending from the toe end of the foot portion 166 that hooks onto the other side of the lock protrusion 154 to prevent the lock protrusion 154 from inadvertently slipping away from being hooked by the foot portion 166. Finally, while the key 160 of this second embodiment may be removed from a spent inflator 10, the user should nevertheless discard the key 106 with the spent inflator 10.
The present invention includes that contained in the appended claims as well as that of the foregoing description. Although this description has been described in its preferred form with a certain degree of particularity, it should be understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction, combination, or arrangement of parts thereof may be resorted to without departing from the spirit and scope of the invention.
Now that the invention has been described,
This application claims the benefit of pending provisional application Nos. 62/684,725, filed Jun. 13, 2018 and 62/693,022, filed Jul. 2, 2018, the disclosures of which are incorporated by reference herein.
| Number | Date | Country | |
|---|---|---|---|
| 62684725 | Jun 2018 | US |
