Temporary Protective Device for Fire Protection Sprinklers

Abstract

Temporary devices and methods for providing a protected installed fire protection sprinkler assembly in an area, building, occupancy or worksite under construction and/or renovation. A protective device is embodied as a cap to house and protect the installed sprinkler assembly within an internal chamber. The protective cap includes a receiver end that forms a gription surface engagement with a peripheral surface of the sprinkler assembly. The cap provides an aerosol shield having peripheral shielded openings sufficient for heated gas to enter the internal chamber to thermally actuate the housed sprinkler assembly in the event of a fire; and yet limit the flow of aerosol paint spray and other debris into the chamber during construction or renovation activities that could damage or adversely impact sprinkler performance. The protective cap is displaced from the sprinkler assembly upon sprinkler actuation to permit the sprinkler to operate and distribute firefighting fluid without interference.

Claims

1. A method of protecting a fire protection sprinkler assembly, the fire sprinkler assembly including a fire protection sprinkler having a minimum operating pressure and a thermally responsive element having a thermal sensitivity, the fire sprinkler assembly including an escutcheon plate having a peripheral surface disposed about the fire protection sprinkler, the method comprising: installing the fire protection sprinkler assembly; and providing a protective cap proximate the escutcheon plate, the protective cap having an aerosol shield that maintains the thermal sensitivity of the thermal responsive element and allows the thermally responsive element of the fire protection sprinkler to actuate within the protective cap so that firefighting fluid is discharged from the fire protection sprinkler at least at the minimum operating pressure to displace the protective cap from the escutcheon plate.

2. The method of claim 1, wherein the providing includes gripping the peripheral surface of the escutcheon plate with the protective cap, the gripping includes forming a gription surface engagement between a plurality of spaced apart internal surfaces of the protective cap and the peripheral surface of the escutcheon plate.

3. The method of claim 2, wherein the gripping includes axially receiving the sprinkler through a sprinkler receiving end defined by the plurality of spaced apart internal surfaces of the protective cap and into an internal chamber of the aerosol shield formed between the sprinkler receiving end and a closed terminal end of the protective cap.

4. The method of claim 3, further including locating a plurality of shielded openings of the aerosol shield so as to provide access to the internal chamber in an axial direction from the open receiving end to the closed terminal end.

5. The method of claim 4, wherein providing the protective cap includes forming the protective cap with a thermally responsive material in which each shielded opening in the plurality of shielded openings defines an initial size that changes in a thermal response to a fire.

6. The method of claim 4, wherein locating the plurality of shielded openings comprises providing at least one louver channel.

7. The method of claim 4, wherein the locating includes defining at least one shielded opening in the plurality of shielded openings in the protective cap with a transverse gap between a first wall portion of the protective cap and a second wall portion of the protective cap; and a transition wall between the first wall portion and the second wall portion.

8. The method of claim 7, wherein defining the at least one shielded opening includes forming the first wall portion with a first radial distance from a central axis and forming the second wall portion with a second radial distance greater than the first radial distance.

9. The method of claim 7, wherein defining the at least one shielded opening includes integrally forming the first wall portion axially adjacent the second wall portion to form the transition wall between the first wall portion and the second wall portion and axially aligning the transition wall with the at least one shielded opening.

10. The method of claim 1, wherein the thermally responsive element actuates within the protective cap in a room heat test equivalent to a Standard Sprinkler tested in accordance with UL 199, Section 3 (Feb. 25, 2022).

11. The method of claim 10, wherein the thermal sensitivity of the thermally responsive element of the fire protection sprinkler is that of a Fast Response sprinkler.

12. The method of claim 10, wherein the thermal response is that of a Standard Response sprinkler.

13. The method of claim 1, wherein the minimum operating pressure of the fire protection sprinkler is 7 psi.

14. A protective cap for housing a fire protection sprinkler assembly having a trigger assembly and an escutcheon plate with a peripheral surface, the protective cap comprising: an open receiver end portion defined by a plurality of gription segments angularly spaced apart about a central longitudinal axis to engage and partially circumscribe the peripheral surface of the escutcheon plate; a closed terminal end portion opposite and axially spaced from the open receiver end portion along the central longitudinal axis; and an aerosol shield extending between the open receiver end portion and the closed terminal end portion, the aerosol shield being centered about the central longitudinal axis to define an internal chamber for housing the fire protection sprinkler assembly, the aerosol shield including a plurality of shielded openings for gas communication with the internal chamber to operate the trigger assembly.

15. The protective cap of claim 14, wherein the gription segments are equiangularly spaced about the central longitudinal axis and extend axially from the aerosol shield, each gription segment defining an internal arcuate surface curved about the central longitudinal axis.

16. The protective cap of claim 14, wherein the aerosol shield includes: at least one first body portion at least partially circumscribed about the central longitudinal axis to define a first radial distance; and at least one second body portion at least partially circumscribed about the central longitudinal axis to define a second radial distance greater than the first radial distance so as to form a transverse gap between the at least one first body portion and the at least one second body portion to define one shielded opening in the plurality of shielded openings.

17. The protective cap of claim 16, wherein the at least one second body portion is angled with respect to the central longitudinal axis.

18. The protective cap of claim 16, wherein the at least one first body portion defines a constant radial distance about the central longitudinal axis; and the at least one second body portion defines a variable radial distance about the central longitudinal axis.

19. The protective cap of claim 16, wherein the aerosol shield includes a transition portion axially between the at least one first body portion and the at least one second body portion so as to be axially aligned with the one shielded opening, the one shielded opening being closer to the open receiver end portion than the closed terminal end portion.

20. The protective cap of claim 16, wherein the at least one first body portion and the at least one second body portion are interleaved with one another to define at least one louver channel.

21. The protective cap of claim 20, wherein the at least one louver channel includes a pair of louver channels diametrically opposed from one another.

22. The protective cap of claim 21, wherein the aerosol shield includes a pair of arcuate connecting portions diametrically opposed from one another.

23. The protective cap of claim 21, wherein the cap is symmetrical about a first bisecting plane and asymmetrical about a second bisecting plane perpendicular to and intersecting the first bisecting plane along the central longitudinal axis.

24. The protective cap of claim 23, wherein the at least one louver channel has a first end and a second end defining a closed-formed frame along the aerosol shield.

25. The protective cap of claim 14, wherein the plurality of shielded openings provides a first fluid access to the internal chamber in a direction from the open receiver end portion toward the closed terminal end portion and a second fluid access in a radial direction with respect to the central axis, the second fluid access being less than the first fluid access.

26. The protective cap of claim 14, wherein the cap is formed from thermally responsive material with each shielded opening in the plurality of shielded openings defining a first geometry of a first size, wherein when exposure of the cap to a sufficient level of heat, the cap thermally responds such that at least one opening in the plurality of openings defines a second geometry having a second size that is larger than the first size.

27. The protective cap of claim 14, wherein the aerosol shield defines at least one louver channel for gas communication with the internal chamber in a direction from the open receiver end portion toward the closed terminal end portion.

28. The protective cap of claim 27, wherein the at least one louver channel includes a pair of diametrically opposed louver channels, each channel spans over an arc length about the central longitudinal axis.

29. The protective cap of claim 28, wherein the arc lengths of the pair of louver channels are equal.

30. The protective cap of claim 28, wherein the arc lengths of the pair of louver channels are different from one another.

31. The protective cap of claim 27, wherein the protective cap is asymmetrical about a first bisecting plane and symmetrical about a second bisecting plane perpendicular to the first plane, the central longitudinal axis being located along an intersection of the first and second planes.

32. The protective cap of claim 27, wherein the protective cap is symmetrical about a first bisecting plane and symmetrical about a second bisecting plane perpendicular to the first plane, the central longitudinal axis being located along an intersection of the first and second planes.

33. The protective cap of claim 27, wherein the at least one louver channel has a first end and a second end defining a closed-formed frame along the aerosol shield.

34. A protective cap for housing a fire protection sprinkler assembly having a thermal sensitivity, the protective cap comprising: an open receiver end portion for engagement with the fire protection sprinkler assembly; a closed terminal end portion opposite and axially spaced from the open receiver end portion along a central longitudinal axis; and an aerosol shield extending between the open receiver end portion and the closed terminal end portion that defines an internal chamber about the central longitudinal axis for housing the fire protection sprinkler assembly, the aerosol shield maintaining the thermal sensitivity of the fire protection sprinkler assembly and allowing a sufficient flow of heated air into the internal chamber to thermally actuate the fire protection sprinkler; and permitting a sufficient flow of firefighting fluid from the thermally actuated fire protection sprinkler to displace the protective cap.

35. The protective cap of claim 34, wherein the aerosol shield includes a plurality of shielded openings configured such that fire protection sprinkler thermally actuates within the protective cap with the thermal sensitivity being equal to that of a Standard Response sprinkler.

36. The protective cap of claim 35, wherein the cap is formed from a thermally responsive material that melts in response to a sufficient level of heat such that at least one shielded opening in the plurality of shielded openings increases in area while maintaining a flow of firefighting fluid out of the internal chamber from the thermally actuated fire protection sprinkler to displace the protective cap from the sprinkler assembly.

37. The protective cap of claim 36, wherein the aerosol shield includes at least one first body portion at least partially circumscribed about the central longitudinal axis defining a first radial distance; and at least one second body portion at least partially circumscribed about the central longitudinal axis defining a second radial distance greater than the first radial distance so as to form therebetween an initial area of one shielded opening in the plurality of shielded openings, the second body portion melting such that the initial area increases in the response to the sufficient level of heat.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate exemplary embodiments of the invention, and together, with the general description given above and the detailed description given below, serve to explain the features of the invention. It should be understood that the preferred embodiments are some examples of the invention as provided by the appended claims.

[0015] FIG. 1 is a partial cross-sectional exploded view of a temporarily protected sprinkler assembly.

[0016] FIG. 1A is a partial cross-sectional view of the protected sprinkler assembly of FIG. 1.

[0017] FIG. 1B is a detailed view of section IB-IB in FIG. 1.

[0018] FIGS. 2A-2B are perspective views of a preferred embodiment of a protective cap for use in the protected sprinkler assembly of FIG. 1.

[0019] FIG. 2C is a perspective view of another preferred embodiment of a protective cap for use in the protected sprinkler assembly of FIG. 1.

[0020] FIG. 3A is a plan end view of the protective cap of FIGS. 2A-2B.

[0021] FIG. 3B is a plan end view of another preferred embodiment of a protective cap for use in the protected sprinkler assembly of FIG. 1.

[0022] FIG. 3C is a plan end view of the protective cap of FIG. 2C.

MODE(S) FOR CARRYING OUT THE INVENTION

[0023] Shown in FIGS. 1 and 1A are varying views of a preferred embodiment of an installed automatic fire protection sprinkler assembly 100 temporarily housed within a preferred embodiment of a protective cap 10. As illustrated, the fire protection sprinkler assembly 100 includes a sprinkler frame and fluid member, an escutcheon plate 102 and a thermally responsive element 104 having a thermal sensitivity supporting a seal assembly (not shown). The preferred cap 10 provides protection to the sprinkler from foreign matter and/or unintended impact and damage that may occur during construction operations, for example, during installation and/or finishing of the wall W. Preferred embodiments of the protective cap 10 provide for sprinkler protection from aerosol spray paint coming from finishing operations conducted proximate the sprinkler assembly 100. In protecting the sprinkler 100, the cap 10 preferably maintains the thermal sensitivity of the thermally responsive element 104 of the sprinkler after the construction/renovation operations are completed and the cap is removed. In addition to providing protection from accidental impact, the preferred protective cap 10 provides for sufficient air or gas and heat exchange therethrough to thermally actuate the thermally responsive element 104 and the housed automatic sprinkler 100 in the event of a fire. Accordingly, the sprinkler assembly 100 can be placed into service to provide fire protection of the surrounding occupancy during construction operations while the sprinkler is itself protected and guarded from accidental impact due to the construction operations.

[0024] In a preferred method of protecting an installed sprinkler, as shown in FIG. 1, the preferred protective cap 10 is located or disposed over the installed automatic sprinkler assembly 100 in its unactuated state. Depending upon the operational orientation of the sprinkler, the protective cap 10 can be oriented horizontally with respect to a vertical wall or vertically with respect to a horizontal overhead ceiling. For example, for the illustrative horizontal sidewall sprinkler assembly shown, the cap 10 is oriented horizontally with respect to the vertically extending wall W. With the cap 10 secured over the sprinkler assembly 100, the ceiling or wall W can be marked and a through hole formed therein. The protective cap 10 can include a central point or marker at its closed end to facilitate wall marking. The wall W can then be disposed over the protected sprinkler assembly, hung in place and finished. Generally, an automatic fire protection sprinkler has a minimum operating pressure, e.g., 7 psi. at which firefighting fluid is required to be delivered to the installed sprinkler so that upon sprinkler actuation, the fluid is discharged, at least at the minimum operating pressure, and distributed to effectively address a fire and/or wet the surrounding area in a desire manner. In protecting the installed sprinkler assembly 100, the protective cap 10 is preferably temporarily secured about the installed sprinkler assembly 100 with a securement that is sufficiently robust to withstand or resist an impact force to remain in place, yet sufficiently pliable or flexible so that the protective cap 10 is displaced from the sprinkler upon thermal actuation of the sprinkler and upon discharge of the firefighting fluid from the sprinkler assembly 100 at the minimum operating pressure, preferably at least 7 psi., or greater.

[0025] Preferred embodiments of the protective cap 10 include a generally tubular body with an open receiver end portion 12 for receiving the sprinkler assembly 100 and a closed terminal end portion 14 opposite the sprinkler receiving end portion 12, axially spaced apart from one another along a central longitudinal axis X-X. The tubular body surrounds or circumscribes the central axis X-X and extends between the open receiver end portion 12 and the closed terminal end portion 14 to define an internal chamber 18 for housing the installed sprinkler assembly 100 therein. The tubular body preferably defines a substantially circular cylindrical geometry about the central axis X-X and defines an aerosol shield 16 of the protective cap 10. The aerosol shield 16 can define alternative non-circular cylindrical geometries such as, for example, a rectangular cylindrical, a square cylindrical geometry or an oval cylindrical geometry about the central axis X-X provided the internal chamber 18 of the tubular body can house and protect the installed sprinkler assembly 100 in a manner as described herein. Preferred embodiments of the protective cap 10 described herein are preferably formed from a polymer or plastic material such as, for example, polyethylene and formed by molding such as, for example, injection molding. Moreover, the preferred cap 10 is formed with a sufficient rigidness and/or material thickness to protect the sprinkler assembly 100 from accidental impact and damage. Alternatively or additionally, the material of the cap can be thermally responsive so as to melt and/or change shape in the presence of sufficient heat to increasingly facilitate communication of heated air or gases into the internal chamber of the protective cap 10 in order to thermally actuate the sprinkler assembly 100, yet provide for a structure that can be displaced from the assembly 100 upon fluid discharge from the actuated sprinkler at least at the minimum operating pressure of the sprinkler.

[0026] The open receiver end portion 12 of the protective cap 10 is preferably configured to axially receive the installed sprinkler assembly 100 and to engage the sprinkler assembly 100 to maintain the protective cap 10 about the sprinkler. More preferably, the open receiver end portion 12 forms a gription surface engagement to secure the protective cap 10 about the sprinkler assembly 100. In a preferred sprinkler installation as shown in FIG. 1A, the sprinkler assembly 100 includes the escutcheon plate 102 disposed about the automatic fire protection sprinkler. The protective cap 10 is located preferably proximate the escutcheon plate 102. More particularly, the open receiver end portion 12 of the protective cap is configured to form a preferred gription surface engagement with a peripheral surface of the escutcheon plate 102 circumscribed about the central axis X-X. Depending upon the geometry of the escutcheon 102, the peripheral surface of the escutcheon 102 can be circular, rectangular, square, polygonal or elliptical. Accordingly, the open receiver end portion 12 can be shaped accordingly to provide the preferred gription surface engagement with the escutcheon 102. In an alternate embodiment not shown, the open receiver end portion 12 can be configured to form a surface engagement about another sprinkler component that is directly or indirectly affixed to the sprinkler. The open receiver end portion 12 preferably includes a plurality of a gription segment 20 angularly spaced from one another about the central longitudinal axis X-X and extending from the aerosol shield 16.

[0027] In the preferred embodiment shown with reference to FIG. 2A, the open receiver end portion 12 includes four gription segments 20a, 20b, 20c, 20d equiangularly spaced apart about the central longitudinal axis X-X. In the preferred cap 10, the spaced apart gription segments 20 define a terminal edge 36 of the protective cap circumscribed about the central longitudinal axis X-X. The terminal edge 36 includes a first group of edges 36a disposed in a first plane P1 perpendicular to the central longitudinal axis and at least a second group of edges 36b disposed in a second plane P2 perpendicular to the central longitudinal axis X-X. The first plane P1 and the second plane P2 are axially spaced apart along the central longitudinal axis X-X. Each gripping portion 20 extends preferably axially from the second plane P2 and preferably includes an arcuate internal surface that is curved about the central axis X-X for forming the preferred frictional engagement about the sprinkler assembly 100.

[0028] The gription segments 20 are preferably spaced apart to define the preferred gription surface engagement with the sprinkler assembly 100 and more preferably with the peripheral surface of the escutcheon plate 102 to locate and secure the protective cap 10 about the installed sprinkler assembly 100. The preferred frictional engagement is sufficient to secure the cap 10 about the sprinkler and provide protection against accidental impact during construction operations. Although the cap 10 is preferably shown secured to the escutcheon plate 102, it should be understood that the cap 10 can be configured to engage other supporting structures of the sprinkler or surrounding the sprinkler provided the cap 10 can house, surround and protect the installed sprinkler in its unactuated state.

[0029] In another preferred aspect of the frictional engagement between the cap 10, the engagement is temporary in the sense that the cap 10 preferably disengages from the sprinkler assembly 100 upon sprinkler actuation and/or fluid discharge to be clear of the installed sprinkler assembly 100 and its spray or discharge pattern. With reference to the preferred embodiments of FIGS. 1 and 1A, upon sprinkler actuation in thermal response to a fire event and/or a sufficient level of heat, the thermally responsive trigger or element 104 operates to release the seal assembly of the sprinkler assembly 100. Fluid delivered to the sprinkler assembly 100 at the minimum operating pressure of the sprinkler of 7 psi. or greater is discharged and distributed by the sprinkler assembly 100. The trigger operation and/or the fluid discharge is sufficient to disengage the protective cap 10 from its preferred temporary securement about the sprinkler assembly 100. Accordingly, the preferred gription surface engagement is configured to break or disengage from the sprinkler upon a fluid discharge from the sprinkler at the minimum operating pressure, preferably at least 7 psi., or greater.

[0030] Moreover, the frictional securement or gription of the cap 10 can be preferably broken by a sufficient level of manual manipulation of the cap. Accordingly, at the conclusion of construction operations, the sprinkler 100 can be uncovered by manually removing the cap 10 so that the sprinkler assembly 100 and the fire protection system can be placed into a final state of service. Preferably, the frictional engagement of the cap 10 with the escutcheon plate 102 permits the cap 10 to be axially pulled from its securement by installers or construction personnel.

[0031] In the unactuated state of the installed sprinkler, the protective cap 10 protects the sprinkler assembly 100 from accidental impact or debris such as, for example, aerosol paint spray or dust from construction operations. Accordingly, the closed terminal end portion 14 opposite the open receiver end 12 is preferably a continuous solid surface to shield the sprinkler assembly 100 axially in a direction from the terminal end portion 14 toward the receiver end 12. Moreover, the preferred aerosol shield 16 includes an arrangement of surfaces about the central axis X-X to shield the sprinkler assembly 100 radially with respect to the internal chamber 18 and the central axis X-X. Notwithstanding however, the aerosol shield 16 also includes one, and preferably more than one, transverse gap, relative to the central axis X-X, that defines a preferred shielding opening 30 peripherally located, oriented and configured to permit heat to flow therethrough for thermal actuation of the sprinkler assembly 100 housed within the cap 10. More specifically, the plurality of shielded openings 30 are preferably located between the open receiver end portion 12 and the closed terminal end portion 14 and in fluid communication with the internal chamber 18 sufficient to permit thermal actuation of the installed sprinkler assembly 100 in a preferred manner as described herein.

[0032] Additionally, the configuration of each shielded opening 30 individually and/or the arrangement of the openings 30 collectively preferably permit or facilitate disengagement of the preferred gription surface engagement and displacement of the cap 10 clear of the sprinkler assembly 100 and its fluid distribution upon sprinkler actuation and/or fluid discharge at the minimum operating pressure or greater. With reference to the preferred embodiment of the protective cap 10 shown in FIGS. 2A and 2B, the openings 30 formed in the aerosol shield 16 are preferably axially or linearly aligned with one another into two groups within two louver channels 32a, 32b that are preferably diametrically opposed from one another about the receiver end portion 12. The aerosol shield 16 also preferably defines or forms a pair of connecting portions 34a, 34b that are opposed, and more preferably diametrically opposed, to one another to interconnect the louver channels 32a, 32b to one another. Each of the connecting portions 34a, 34b are preferably arcuate spanning an angular length 13 about the central axis X-X. The connecting portions 34a, 34b each preferably provide a continuous solid peripheral shielding surface of the cap 10. Moreover, each of the connecting portions 34a, 34b are preferably arcuate spanning an angular length a about the central axis X-X. The angular lengths a of the connecting portions 34a, 34b can be equal, as seen in FIG. 3A or vary from one another as seen in FIG. 3B. Depending upon the arc lengths of the connection portions 34a, 34b the angular lengths 13 of the opposed louver channels 32a, 32b can be equal or alternatively vary from one another. Thus, the protective cap 10 can be asymmetrical about a first bisecting plane BP1 and symmetrical about a second plane BP2 perpendicular to the first plane BP1 and intersecting one another at the central longitudinal axis. Alternatively, the protective cap 10 can be symmetrical about one or more of the bisecting BP planes through which the central longitudinal axis extends.

[0033] In the preferred embodiment of the cap 10, the louver channels 32a, 32b are defined by portions of the tubular cap body or wall of different radii to form the preferred shielded openings 30 between the body portions. For example, as seen in FIG. 1, the wall of the tubular body includes a first body portion 40 that is at least partially circumscribed about the central longitudinal axis X-X to define a first radial distance R1. The tubular body also includes at least a second body portion 42 at least partially circumscribed about the central longitudinal axis X-X to define a second radial distance R2 that is greater than the first radial distance R1 so as to form a transverse gap between the first body portion 40 and the second body portion 42 that defines the preferred shielded opening 30 in fluid communication with the internal chamber 18 of the protective device 10. The radial distances R1, R2 respectively defined by the body portions 40, 42 can be constant. Alternatively or additionally body portions 40, 42 or parts thereof can be angled with respect to the central axis X-X or line parallel to the central axis X-X so that one or more of the radial distances R1, R2 are variable as seen, for example, in FIG. 1. With reference to FIG. 1B, a peripheral edge 40a of the first body portion 40 defines the first radial distance R1 and a peripheral edge 42a of the second body portion 42 defines the second radial distance R2 greater that the first radial distance R1 to form the transverse gap therebetween and define the preferred shielded opening 30. The peripheral edges 40a, 40b defining the transverse gap can be located relative to one another such that, geometrically, a ray extending normal to the area of the transverse gap and the resulting opening 30 can be orthogonal or skewed with respect to the central axis X-X.

[0034] In a preferred aspect, the first and second body portions 40, 42 are preferably alternately interleaved in the axial direction to form preferred angled slats of the louvered channel arrangement 32a, 32b. In another preferred aspect, axially adjacent portions 40, 42 are integrally formed with one another. As shown, a second body portion 42 is preferably integrally formed with a lower axially adjacent first body portion 40 to define a transition portion 46 of the protective cap 10. Accordingly, in preferred embodiments of the cap 10 the preferred shielded opening 30 and the transition portions 46 are preferably interleaved with one another. Moreover, the protective cap 10 is preferably formed with the transition portions 46 axially aligned with the opening 30. In the preferred louver channels 32a, 32b, the openings 30 is located closer to the open receiver end 12 than the axially adjacent transition portions 46. The second body portion 42 is preferably angled with respect to the central axis at an angle of ten degrees (10°) or less, and more preferably angled at seven degrees (7°) or less. The access to the preferred shielded openings 30 is preferably defined in a direction from the open receiver end 12 to the closed terminal end 14 to provide heat exchange through the internal chamber 18 for thermal detection by the thermally responsive element 104 of the sprinkler assembly 100. The formation of the transition portions 46 between the first and the second body portions 40, 42 limit or deny access to the internal chamber 18 in the direction from the closed terminal end 14 toward the open receiver end 12. Thus, the formation of the preferred openings 30 and the transition portions 46 provide for the preferred aerosol shield to limit the amount of debris and more particularly, aerosol spray paint, that can enter the internal chamber from construction or renovation operations performed around the installed sprinkler assembly 100. In the preferred embodiments shown, the shielded openings 30 themselves are fully exposed for unimpeded fluid flow therethrough.

[0035] Alternatively, the shielded opening 30 can be temporarily impeded by a full or partial covering or wrap that is thermally responsive so as to fully expose the opening 30 in the event of a fire. More specifically, the wrap can temporarily cover the openings 30 to prevent any spray or debris from entering, but then thermally respond by shrinking or contracting in response to a sufficient level of heat to uncover the opening 30 and permit the increasing entrance of heated gas or air into the internal chamber 18. In another preferred aspect or alternate embodiment, the protective cap 10 is made of a thermally responsive material that melts in the presence of a level of heat indicative of a fire. The melting of the cap material changes the geometry of the openings 30 so that the openings become enlarged to increase the fluid communication of heated air or gas into the internal chamber of the cap 10 for thermal operation of the thermally responsive element 104. Thus, where an opening 30 of the formed cap 10 defines a first geometry having an initial area or size, the opening 30 defines a second geometry having a preferably larger subsequent size or area after thermal exposure to a sufficient level of heat.

[0036] In particular embodiments of the cap 10, portions of the preferred aerosol shield 16 melt in a thermal response to a sufficient level of heat exposure to increase the size of one or more openings 30 of the cap 10. As previously noted, the openings 30 have an initial size to allow a sufficient flow of heated air or gas from a fire into the internal chamber 18 to thermally actuate the fire protection sprinkler 100 resulting in the discharge of firefighting fluid. The preferred aerosol shield 16 and its openings 30 also preferably permit a sufficient flow of firefighting fluid from the thermally actuated fire protection sprinkler to break the gription surface engagement with the sprinkler assembly and displace the protective cap 10 from the sprinkler 100. Additionally or alternatively, where the cap 10 is formed from thermally responsive material that melts in response to of the heat level, one or more shielded opening 30 increases in area to increase the flow of heated air or gas into the chamber 18 while maintaining a flow of firefighting fluid out of the internal chamber 18 from the thermally actuated fire protection sprinkler 100 to break the gription surface engagement and displace the protective cap. For example with reference to FIG. 1B, in particular preferred embodiments of the cap 10 in which the aerosol shield 16 includes a first body portion 40 at least partially circumscribed about the central longitudinal axis X-X defining a first radial distance R1; and a second body portion 42 at least partially circumscribed about the central longitudinal axis X-X defining a second radial distance R2 greater than the first radial distance R1 to form therebetween an initial area of one shielded opening 30 in the plurality of shielded openings, the second body portion 42 thermally responds to a sufficient level of heat and melts with the edge 42a of the second body portion moving away from the edge 40a of the first body portion such that the initial area of the opening 30 increases.

[0037] Preferably, the shielded openings 30 of the cap 10 are configured to provide sufficient access to the internal chamber 18 for heated air or gas to actuate the thermally responsive element or trigger assembly of the protected sprinkler assembly 100 with its designed, or at least an acceptable, level of thermal responsiveness or sensitivity. “UL Standard for Safety for Automatic Sprinklers for Fire-Protection Service, ANSI/CAN/UL/ULC 199” (13th ed. Feb. 25, 2022) (“UL 199”) is a Joint Canada-United States National Standard that provides operational testing for fire protection sprinklers alone, i.e., without a housing or protective covering. Under the test standards, the thermal sensitivity of an unprotected sprinkler and its thermally responsive element is measured by determining the operating time of the sprinkler within a room of a particular size subject to particular installation arrangement and fire test parameters. Section 33 of UL 199, which is incorporated by reference, describes the parameters of “Room heat tests” and the time to sprinkler operation requirements for “Standard Response” sprinklers and “Quick Response” Sprinklers. Depending on the temperature rating of the sprinkler, a Standard Response sprinkler is required to operate within one of the following time limits: 120 seconds, 150 seconds, 189 seconds or 231 seconds. To meet the Quick Response sprinkler requirement, depending upon the sprinkler temperature rating, the sprinkler must operate within one of the following time limits: 55 seconds or 75 seconds.

[0038] Embodiments of the sprinkler assembly 100 housed within the preferred cap 10 were installed and tested in accordance with UL 199, Section 33 to evaluate the impact of the cap 10 on the thermal sensitivity of the sprinkler assembly 100 being protected. Generally, the room heat test is conducted by testing ten protected sprinklers in groups of five within an enclosed room measuring 15 ft. long, 15 ft. wide and 8 ft. high. The protected test sprinklers are located and installed and conditioned to a starting ambient temperature in accordance with the test parameters. A burner is located in a corner of the room to heat the test sprinklers to operation. The burner is configured and installed with a flow of gas as specified by the standard. In one preferred aspect of the tests, where the sprinkler assembly 100 housed within the cap 10 is a “Standard Response” sprinkler, the sprinkler preferably thermally actuated as a Standard Response sprinkler when housed within the protective cap 10. Alternatively, the protected sprinkler thermally responds within the protective cap at least with the thermal response of a Standard Sprinkler regardless of the thermal sensitivity of the sprinkler that is housed within the protective cap. Therefore, in another preferred aspect of the tests, the sprinkler assembly 100 thermally actuates at least as fast as a Standard Response sprinkler when housed within the protective cap 10 regardless of whether the protected sprinkler assembly 100 within the cap 10 is a “Quick Response” sprinkler or a Standard Response sprinkler. Thus, the cap 10 can provide for the desired sprinkler protection and an acceptable sprinkler thermal response in systems protecting construction sites or sites under renovation. More preferably, the cap 10 provides for a fire sprinkler housed therein and subjected to a heat room test, that its thermally responsive element 104 will actuate within the protective cap 10 in a time equivalent to a Standard Sprinkler tested in accordance with UL 199, Section 3. More particularly, preferred embodiments of the cap 10 constructed from a thermally responsive material and subjected to the heat room tests provide for openings 30 that increase in size due to the melting of portions of the cap 10 such that the resulting heat and gas flow into the internal chamber 18 cause the sprinkler 100 to actuate within the protective cap 10 in a time equivalent to a Standard Sprinkler and discharge fluid. The openings 30 of the melted cap 10 preferably maintain a flow of fluid from the cap 10 that will sufficiently break the surface engagement between the cap 10 and the sprinkler 100 and displace the cap 10 for effective fluid distribution from the exposed sprinkler.

[0039] In the embodiments of the protective cap 10 shown in FIGS. 2A and 2B and FIGS. 3A and 3B, the louver channels 32a, 32b extend axially through the closed terminal end 14. Accordingly, the angular lengths of the louver channels 32a, 32b are visible at the closed terminal end 14 of the protective cap 10. In an alternate preferred embodiment of the protective device 10′ shown in FIG. 2C, an alternate embodiment of louver channel 32′b is shown located completely along the aerosol shield 16 between the open receiver end 12 and the closed terminal end 14. The preferred louver channel 32′b defines a first edge end 33a of the louver channel 32′ and a second edge end 33b that is axially spaced from the first edge end 33a to define an axial length L of the channel 32′b. The first and second edge ends 33a, 33b of each louver channel, in combination with the angular length of the louver channel define a preferred closed-form frame 35 of the louver channel 32 that is completely formed along the aerosol shield 16 of the protective cap 10. Accordingly, without the louver channel formation extending into the closed terminal end 14, the closed terminal end 14, as shown in FIGS. 2C and 3C, defines a preferred circular periphery 14a about the center of the protective cap 10′ and the central axis X-X of the cap 10′. In a preferred aspect of the protective cap 10′, two closed-frames 35 of louver channels 32′a, 32′b are disposed along the aerosol shield 16 preferably diametrically opposed from one another. The two channels 32′a, 32′b can be identical or different and/or spaced such that the protective cap 10 is symmetrical or asymmetrical about one or more dividing planes extending through the central axis X-X.

[0040] While the present invention has been disclosed with reference to certain embodiments, numerous modifications, alterations, and changes to the described embodiments are possible without departing from the sphere and scope of the present invention, as defined in the appended claims. Accordingly, it is intended that the present invention not be limited to the described embodiments, but that it has the full scope defined by the language of the following claims, and equivalents thereof.