Patent Application
20230090915
The present invention relates generally to protection devices and installation tools for fire protection sprinklers and systems. In particular, the present invention relates to a protective cover and installation device for fire protection sprinklers.
Fire protection sprinklers include a sprinkler frame body with an inlet connected to a pressurized supply of firefighting fluid, such as water, and some type of fluid deflection member spaced from an outlet of the frame body to distribute firefighting fluid discharged from the outlet in a defined spray distribution pattern over an area to be protected. In some fire protection sprinklers, the release of fluid discharge from the sprinkler body is controlled. For example, automatic fire protection sprinklers include a fusible or thermally responsive trigger assembly which secures a seal over an internal central orifice formed proximate the outlet of the frame body. When the temperature surrounding the automatic sprinkler is elevated to a pre-selected value indicative of a fire, the trigger assembly operates, fractures or collapses to release the seal assembly and fluid flow is initiated through the sprinkler body and out the outlet to impact the fluid deflection member. In other types of controlled sprinklers, the trigger and/or seal is operated or otherwise ejected by a mechanical, electrical or computer-controlled actuator.
The response and actuation of the sprinkler is based upon the thermally responsive trigger or actuator; and the spray pattern or distribution of the firefighting fluid is defined by the fluid deflection member configuration. Accordingly, proper sprinkler performance is a function of these operative components. In order to maintain the expected performance of the sprinkler, there is a need to protect the automatic fire protection sprinkler from unintended impact and/or damage. Known fire protection covers are shown and described in U.S. Pat. Nos. 6,669,111; 7,540,330; 7,757,967; and 7,900,852. Generally, these known protective devices are either axially disposed over the sprinkler to protect the fluid deflection member and the thermally responsive trigger. Alternatively, the protective device is strapped about the sprinkler frame between the frame body and the fluid protection member to protect the thermally responsive trigger. These known protective sprinkler covers are made from plastic and are affixed about the sprinkler to protect the sprinkler during storage, transport, handling and/or during the installation process. Once the sprinkler is properly installed in the branch connector, the protective device can be removed to place the sprinkler into service.
Fire protection sprinklers are used, for example, in the protection of storage commodities and occupancies. Storage fire protection systems include a network of pipes connected to a firefighting fluid supply and installed above the storage commodity beneath the ceiling of the occupancy. The piping network includes one or more branch lines coupled to a cross-main which is connected to a fluid supply by a vertical piping riser to supply the branch line(s) with the firefighting fluid. Fire protection sprinklers are connected to the branch lines in an appropriate orientation and at an appropriate sprinkler-to-sprinkler spacing.
To connect the fire protection sprinklers to the branch lines, the branch lines are configured as linear pipe headers with branch connectors extending from the header for receipt and threaded connection of a fire protection sprinkler. Known connectors have one inlet end configured for welded connection to the pipe header and an opposite outlet end with a tapered threaded end for connection of a sprinkler. In order to form a fluid tight seal between the threadedly engaged connector and the sprinkler, a sealing tape or putty is be applied to the sprinkler. In order to form a fluid tight seal between the cooperating tapered threads, the sprinkler must be properly torqued using a wrench.
There are also known branch connectors which eliminate either or both of the tapered thread connection or the need to apply a sealing tape or putty. For example, each of U.S. Pat. Nos. 8,297,663 and 10,744,527 and U.S. Patent Publication No. 2019/0175968 show and describe connectors or adapters for connecting a fire protection sprinkler to a pipe header. Each of these known connectors use an internal straight thread at the outlet to connect the tapered thread of the fire protection sprinkler, which allows the sprinkler to be placed in a desired rotational orientation without the interference of the thread engagement. To form a fluid tight seal between the connector and the sprinkler, each of the connectors employ an internal annular seal member. The sprinkler is then threaded into the connector and sufficiently torqued to form the fluid tight connection.
In order to maintain protection of the sprinkler during the installation process it is preferred to keep a protective device on the sprinkler. This can create a problem for properly torqueing the sprinkler to form a fluid tight seal. The presence of a known protective device on the sprinkler frame can interfere or prevent proper wrench engagement. Moreover, it is problematic trying to use the known protective device to directly torque the sprinkler because these known protective devices are not configured to sufficiently grasp the sprinkler frame and transfer a torque sufficient to form a fluid tight sealed connection. Accordingly, there is a need for sprinkler protective devices that can protect operative components of the sprinkler during storage, transport handling and installation and also sufficiently transfer a torque to form a fluid tight sealed connection between a sprinkler and a branch connector.
Preferred embodiments of a method of protecting and installing an automatic fire protection sprinkler assembly having a preferred frame with a body and a pair of spaced apart frame arms in a plane and extending from the body with a fluid deflection member coupled to the frame arms and spaced from the body with a thermally responsive trigger assembly coaxially disposed between the body and the fluid deflection member. The preferred method includes shielding the thermally responsive trigger with a concave segment of a protective member relative to the central sprinkler axis and torqueing the sprinkler assembly into a branch connector with a convex segment of the protective member relative to the central sprinkler axis that is preferably located between one frame arm and the trigger. Preferably, the torqueing is performed by hand and is sufficient to form a fluid tight seal between the sprinkler and the branch connector. Preferred embodiments of the method include confronting the one frame arm with a planar segment of the protective member that extends parallel to the plane.
Preferred embodiments of a protected fire protection sprinkler assembly are also provided. One preferred embodiment of a protected fire protection sprinkler assembly includes a fire protection sprinkler including a body having an inlet, an outlet, an internal passageway extending between the inlet and the outlet along a central sprinkler axis, and an external thread formed about the central sprinkler axis. The fire protection sprinkler includes a pair of frame arms extending axially from the body and converging toward one another to preferably form an apex centered along the central sprinkler axis and spaced axially from the outlet. The fire sprinkler includes a fluid deflection member preferably affixed to the apex and centered along the central sprinkler axis with the apex between the thermally responsive trigger assembly and the fluid deflection member. The preferred assembly includes a protection and installation device strapped about the fire protection sprinkler. The protective device preferably includes a first protective member and a second protective member opposed one another about the plane to at least partially surround the thermally responsive trigger assembly. At least one of the first and second protective members preferably includes, with respect to the thermally responsive trigger assembly, a concave segment and a convex segment that are preferably contiguous with one another. An inflection transition is preferably formed between the concave segment and the convex segment to define an external torque assist surface of the protective device. Preferably, each of the first member and second member have a first protection portion for protection of the thermally responsive trigger assembly and a second protection portion axially spaced from the first portion for protection of the fluid deflection member.
Preferred embodiments of a protective device provide a preferred protective installation device for a fire protection sprinkler. The preferred protective device includes a first member and a second member opposed and connected to one another about a plane to at least partially circumscribe a central axis and define an internal void for housing the fire protection sprinkler. The first and second members define a first portion of the protective device having a first width for protecting the thermally responsive trigger and the first and second members define a second portion of the protective device having a second width greater than the first width for protecting the fluid deflection member. Each of the first member and the second member having a first end portion and a second end portion disposed laterally about the internal void. At least one of the first member and the second members has a convex segment with respect to the internal void to define an external torque assist surface of the protective device. The external torque assist portion defines a preferred finger rest region or thumb drive for grasping the protection device and drawing the first and second member toward one another to grip and applying a torque to a sprinkler housed in the internal void.
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.
Shown in
With reference to
The sprinkler 20 is preferably an automatic sprinkler with a thermally responsive trigger assembly 50 coaxially disposed between the body 32 and the fluid deflection member 40. The trigger 50 can be embodied as a frangible glass bulb or alternatively, a solder link with strut and lever assembly. The automatic fire protection sprinkler includes an internal seal assembly 39 that is supported in place by the thermally responsive trigger assembly 50 to maintain a fluid tight seal. In preferred embodiments of the sprinkler 20, the fluid deflection member 40 is affixed to an apex 34c coaxially aligned the central axis X-X. Alternatively, or additionally, the trigger assembly 50 and/or seal assembly 39 can incorporate an actuator for a controlled discharge. In the preferred frame 30, the frame arms 34a, 34b preferably converge to form the preferred apex 34c. The thermally responsive trigger assembly 50 is preferably axially supported by a threaded load screw or member 60 threaded into the apex 34c. Accordingly, the apex 34c is preferably located between the thermally responsive trigger assembly 50 and the fluid deflection member 40.
The sprinkler 20 is installed and connected to the branch connector 200 by the device 100. The protective device 100 is subsequently removed and the sprinkler 20 is placed into service. The trigger assembly 50 is configured to thermally actuate in response to a fire or sufficient level of heat. Upon thermal actuation, the seal assembly 39 is released and ejected from the outlet 33 preferably under fluid pressure delivered to the inlet 31 from the header 300 and through the branch connector 200. The firefighting fluid is discharged from the open outlet 33 for distribution by the fluid deflection member 40 to address the fire event.
Shown in
The preferred protection and installation device 100 is preferably strapped about the sprinkler 20 so as to locate and house operative components of the sprinkler 20 within the internal protective space or void of the device 100. The protective device 100 preferably includes a first member 110a and a second member 110b opposed one another about a plane P to define the preferred internal void about a central axis. Overall, each of the first and second members 110a, 110b define a geometric profile that facilitates sprinkler protection and handling of the assembly 10. In preferred embodiments of the device 100, at least one of the first and second members 110a, 110b defines a shielding segment and a convex segment, with respect to the internal void of the device, having a transition therebetween to define a preferred external torque assist surface of the device. The first and second members define a first width or space therebetween to form the first portion 100a of the device for protecting the thermally responsive trigger 50. The first and second members 110a, 110b also preferably define a second width therebetween that is greater than the first width to form the second portion 100b of the device 100 for protecting the fluid deflection member 40.
The members 110a, 110b are either integrally formed or joined as protective members for peripherally surrounding and preferably at least partially circumscribing each of the thermally responsive trigger 50 and the fluid deflection member 40 with the pair of frame arms 34a, 34b preferably disposed in the plane P. The members 110a, 110b are preferably formed from a polymer or plastic material such as, for example, polyethylene and formed by molding such as, for example, injection molding. Each of the preferably opposed members 110a, 110b has a first lateral end 112a and a second lateral end 112b disposed laterally about the internal void of the device 100 or the sprinkler 20 housed therein. At least one, and preferably both, of the protective members 110a, 110b includes a shielding portion, preferably in the form of a concave segment 114a, and a convex segment 114b, each defined with respect to the central sprinkler axis X-X, the internal volume of the protective device 100 or the thermally responsive trigger assembly 50 contained therein. The concave segment 114a is formed to partially circumscribe and shield the thermally responsive trigger assembly 50. In preferred embodiments, the concave segment 114a defines a variable radius about the central axis X-X. The shielding portion of the members 110a, 110b can be defined by alternate geometries about the axis X-X provided the geometry can at least partially surround and shield the trigger assembly 50.
The concave and convex segments 114a, 114b are formed between the first lateral end 112a and the second lateral end 112b of the protective member 110. Preferably, the convex and concave segments 114a, 114b are contiguous with one another to define a preferred inflection transition 115 of the protective member 110. For the preferred protective device 100, the transition 115 provides a torque assist portion 120 that more preferably includes or defines an external torque assist surface of the protective device 100 that can be used for applying a torque to the protected assembly 10 to facilitate installation of the sprinkler 20 into the branch connector 200 or other fitting. The convex segment 114b defines a preferred finger rest or thumb drive against which a hand torque can be applied as illustrated in
To transfer a torque applied to the device 100 to the sprinkler 20, one and preferably both of the protective members 110a, 110b includes another segment 114c at one or both of the lateral ends 112a, 112b that confronts one of the frame arms 34a, 34b. In preferred embodiments of the device 100, one and preferably both of the protective members 110a, 110b includes a planar segment 114c that confronts one of the frame arms 34a, 34b. More preferably, the planar segment 114c preferably extends parallel to the plane P and is preferably configured contiguously with the concave and convex segments 114a, 114b so that the convex portion 114b is located between the concave segment 114a and the planar segment 114c. Accordingly, the planar segment 114a further defines the preferred external torque assist portion 120 with the convex segment 114b and the preferred inflection transition 115.
The protective device 100 is located axially to extend from the frame body 32 to the fluid deflection member 40. Moreover, the torque assist portion 120 is located axially between the body and the fluid deflection member 40. More preferably, the torque assist portion 120 is located axially between the fluid outlet 33 and the apex 34c; and even more preferably, the torque assist portion 120 is located axially closer to the outlet 33 than to the apex 34c. Additionally, the protective device 100 is disposed about the frame 30 to expose the wrench boss of the sprinkler frame for use of the protective device 100 in combination with a wrench to install the sprinkler. The protective device extends axially to the fluid deflection member 40 and more preferably is configured to house the fluid deflection member 40 and more preferably peripherally surrounds the fluid deflection member 40.
In preferred embodiments of the device 100, each of the first and second members 110a, 110b include defines a first maximum radius from the central sprinkler axis for protecting the thermally responsive trigger 50 assembly and a second protective portion defining a second maximum radius from the central sprinkler axis for protecting the fluid deflection member 40 in which the second maximum radius is greater than the first radius. As seen in
The opposed members 110a, 110b are preferably coupled to one another about the fire protection sprinkler 20. In one preferred aspect, the protective device 100 includes a hinge portion 122, as seen in
In the closed configuration of the device 100, the spacers 124 extend perpendicularly to the plane P between the members 110a, 110b to space the members 110a, 110b apart from one another. In the preferred protected sprinkler assembly 10, the first and second members 110a, 110b are spaced apart from one another about the plane P and more particularly the opposed lateral end portions 112a, 112b are spaced apart about the plane P for gripping the frame arms 34a, 34b therein as seen in
Illustrated in
Where applicable, common reference numbers will be used between different embodiments for similar parts. The protected sprinkler 20 in the assembly 10 of
Referring again to
The connector 200 includes an internally threaded portion 220 proximate the outlet end 214 for coupling preferred embodiments of the protected fire protection sprinkler assembly 10 and more preferably coupling the protected sprinkler assembly 10 by hand torque using preferred embodiments of the protective device 100 described herein. The outlet end 214 and internally threaded portion 220 is preferably configured for connection with a device 200 of a nominal size. Accordingly, preferred embodiments of the branch connector 200 at the outlet end 214 define a nominal size or diameter ranging from ½ inch to 1½ inch and more particularly any one of ½ inch, ¾ inch, 1 inch, 1¼ inch or 1½ inch. The outlet end 214 is preferably defined by a circular planar surface circumscribed and disposed orthogonally with respect to the central longitudinal axis X-X.
Generally, the external thread of the body 32 of the protected fire protection sprinkler 20 is of a tapered form, for example, NPT thread. The internal threaded portion 220 preferably includes an internal straight thread 22 for receipt of the tapered sprinkler thread of the sprinkler 20. The threaded engagement remains sealed from fluid supplied through the inlet end 12 by the proper fluid tight seal sealed engagements between the seal member 400 and the backstop surface 40 and between the sprinkler 20 and the annular seal member 400. The internal diameter ID of the internal straight thread 22 can be defined by any one of the pitch diameter, minor diameter or major diameter of the internal thread 22 provided the straight thread engages the tapered thread of the sprinkler 20. The internal straight thread can be for example, a 1-11.5 NPSH{grave over ( )} Thread; a ¾-14 NPSH Thread; or ½-14 NPS Thread for mating with a correspondingly nominal 1 inch, ¾ inch or ½ inch fire protection sprinkler.
Use of the preferred straight internal thread permits preferred embodiments of the protected sprinkler assembly 10, 10′ to be rotatable about the axis X-X within the branch connector 200, preferably by hand, in any desired position while forming a proper fluid tight seal. More preferably, the internal thread portion 220 and the seal member 400 form a proper fluid tight seal engagement with the sprinkler 20 upon sufficient hand torque using preferred embodiments of the protective device 100, 100′. Threaded installation of the sprinkler 20 deforms the annular seal member 400 and provide a leak-proof fluid-tight seal between the sprinkler 20 and the branch connector 200. The connection between the branch connector 200 and the sprinkler 20 is sufficient to provide a fluid tight seal under a fluid pressure of up to 200 psi or more, for example, pressures of up to and including at least 175 psi.
The discharge or flow characteristics from the sprinkler body 32 is defined by the internal geometry of the sprinkler including its internal passageway, inlet and outlet (the orifice). Generally, the size of the sprinkler discharge orifice is defined by the nominal K-factor of a sprinkler. For a given sprinkler assembly, the larger the K-factor, the larger the discharge orifice, and the smaller the K-factor, the smaller the discharge orifice. Nominal K-factors for sprinklers listed in the National Fire Protection Association Standard Publication, NFPA 13: Standard for the Installation of Sprinkler Systems, can range from 1 to 30 [GPM/(psi.)1/2] and greater. NFPA 13 identifies the following nominal K-factors of 14 or greater: 14[GPM/(psi.)1/2] (“K14”); 16.8[GPM/(psi.)1/2] (“K16.8”); 19.6[GPM/(psi.)1/2] (“K19.6”); 22.4[GPM/(psi.)1/2] (“K22.4”); 25.2[GPM/(psi.)1/2] (“K25.2”) and 28.0[GPM/(psi.)1/2] (“K28”). Even larger nominal K-factors are also possible. As is known in the art, the K-factor of a sprinkler is defined as K=Q/P1/2, where Q represents the flow rate (in gallons/min GPM) of water from the outlet of the internal passage through the sprinkler body and P represents the pressure (in pounds per square inch (psi.)) of water or firefighting fluid fed into the inlet end of the internal passageway through the sprinkler body. Accordingly, the designed performance of a sprinkler is a function of the supply of a minimum fluid pressure or flow.
The length L of the branch connector 200 is preferably defined between the outlet end 214 and a mid-point of the concave portion of the saddle-shaped inlet 212. The overall length L of the branch connector between the inlet end 212 and the outlet end 214 preferably ranges from 1 inch to 1½ inch. Moreover, the overall length L of the branch connector 200 preferably corresponds or varies with the outlet nominal diameter size. For example, for a nominal outlet diameter of 1 inch, the length L is preferably 1¼ inch, where the nominal outlet diameter is ¾ inch, the length L is preferably 1⅛ inch and where the nominal outlet diameter is ½ inch, the length L is preferably 1 1/16 inch. The preferred sprinkler assembly 10 could be used with other known branch connectors shown and described, for example, in each of U.S. Pat. Nos. 8,297,663 and 10,744,527 and U.S. Patent Publication No. 2019/0175968.
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.
This application claims the benefit of priority to U.S. Provisional Patent Application No. 63/247,648, filed on Sep. 23, 2021, which is incorporated by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 63247648 | Sep 2021 | US |
