MULTI-TOOL ADJUSTING SCREW

[0001] This application claims the benefit of U.S. Provisional Patent Application Serial No. 60/913,084, filed on April 20, 2007, which is hereby incorporated herein by reference in its entirety.

FIELD OF THE DISCLOSURE

[0002] The present disclosure relates generally to adjusting screws and, more particularly, to an adjusting screw configured to be adjustable by multiple different tools.

BACKGROUND

[0003] Process control systems utilize a variety of field devices to control process parameters. Many types and sizes of motors, temperature sensors, pressure sensors, fluid valves and/or regulators, etc. are typically distributed throughout process control systems. Often, replacement, repair, and maintenance of a particular field device (e.g., a fluid regulator) require a field technician to carry numerous tools. For instance, certain tools may be needed to replace a field device; other additional tools may be needed to repair the device (e.g., to replace a diaphragm or other component); and still other additional tools may be needed to maintain (e.g., adjust, calibrate, etc.) the device. Such a large assortment of tools is inconvenient, cumbersome, and costly, particularly when each different type of field device requires a similar corresponding assortment of tools. [0004] To address the need to reduce the number of tools needed to replace, repair, and maintain field devices, some manufacturers have configured their field devices so that multiple different tools may be used to, for example, make adjustments (e.g., to an adjusting screw) to the field devices. For example, an adjusting screw may include a boss to receive a socket wrench as well as a slot to

receive a screwdriver blade, thereby providing a field technician a way of making an adjustment using a tool that might otherwise be carried to replace the device, service another component of the device, or which is a more general purpose tool for use with a number of different field devices (e.g., a screwdriver as opposed to a particular size socket wrench).

[0005] However, while some field devices provide adjustment mechanisms that enable a field technician to use any one of multiple different tools, many of these adjustment mechanisms do not meaningfully reduce the number of tools that a field technician must ultimately possess.

SUMMARY

[0006] In one described example, an adjusting screw includes a cylindrical body portion having a first end, a second end, and an outer curved surface. At least a portion of the outer curved surface has threads to engage an internally threaded opening. The example adjusting screw also includes a first raised portion on the first end and offset from a longitudinal axis of the cylindrical body and a second raised portion on the first end and offset from the longitudinal axis of the cylindrical body and opposing the first raised portion. Each of the first and second raised portions is configured to engage a first socket to turn the cylindrical body about the longitudinal axis. Additionally, the first and second raised portions are configured to engage a second socket larger than the first socket to turn the cylindrical body about the longitudinal axis.

[0007] In another described example, an adjusting screw includes a cylindrical body portion having a first end, a second end, a longitudinal axis, and an outer curved surface. At least a portion of the outer curved surface has threads to engage an internally threaded opening. Additionally, the cylindrical body has a

rectangular opening configured to directly engage a socket wrench drive member to rotate the cylindrical member about the longitudinal axis.

[0008] In yet another described example, an adjusting screw for use with a regulator valve includes means for adjustably engaging an threaded opening of the fluid regulator and means for engaging first and second sockets, wherein the first socket has a first size and the second socket has a second size larger than the first size.

BRIEF DESCRIPTION OF THE DRAWINGS

[00091 FIG. 1 is a cross-sectional view of a fluid regulator having a known adjusting screw configuration.

[0010] FIG. 2 is a known fluid regulator adjusting screw configured to be adjustable by multiple tools. [0011] FIGS. 3A and 3B illustrate an example adjusting screw described herein.

DETAILED DESCRIPTION

[0012] An example adjusting screw configured to be adjustable by multiple tools is described herein. In contrast to known adjusting screws, the example adjusting screw described herein is configured to engage two differently sized sockets or socket wrenches, both of which may otherwise typically be carried by a service technician to replace, service, or maintain a device associated with the example adjusting screw. For example, in the case where the example adjusting screw is used to adjust a control or set pressure of a fluid regulator (e.g., a gas regulator), the example adjusting screw may be adjustable (e.g., rotatable about a longitudinal axis of the screw) using a first socket wrench or socket that is also sized to engage flange bolts of the fluid regulator. The example adjusting screw may also be adjustable by a second socket that is sized for use with a valve port of the fluid

regulator. Still further, the example adjusting screw may provide a rectangular (e.g., a square) opening to receive a socket drive member (e.g., a square drive of a socket wrench or socket wrench extension) to adjust the screw. Additionally, the example adjusting screw may include a screwdriver slot or slots to receive a screwdriver blade to enable a field technician or service personnel to adjust the screw using a screwdriver commonly carried by service personnel. [0013] Thus, the example adjusting screw described herein may be used with field devices to reduce the number and/or variety of tools needed by a service person to service those field devices, thereby reducing the overall cost of servicing such devices (e.g., by reducing costs associated with the purchase of tools and/or carrying large numbers of tools).

[0014] Before describing the example adjusting screw in detail, brief descriptions of a fluid regulator 100 having a conventional adjusting screw and a known adjusting screw configured to be adjustable by multiple tools are provided in connection with FIGS. 1 and 2, respectively. FIG. 1 is a cross-sectional view of a fluid regulator 100 having a known adjusting screw configuration. As depicted in FIG. 1 , the fluid regulator 100 includes a casing or housing 102 coupled to a valve body 104. The valve body 104 includes a flow control member 106 that engages a valve seat 108 disposed within a fluid flow passageway formed in the valve body 104 to control the flow of fluid between an inlet 1 10 and an outlet 1 12. A valve stem 1 14, via a lever 1 16, operatively couples the flow control member 106 to a diaphragm 1 18. The diaphragm 1 18 applies a force to the lever 1 16 via a control spring 120 to control the position of the flow control member 106 relative to the valve seat 108.

[0015] The casing 102 contains the diaphragm 1 18 and the control spring 120 that applies a force to the diaphragm 1 18. The force applied by the control spring 120 to the diaphragm 1 18 is adjustable via an adjusting screw 122, which can be accessed by removing a cap or plug 124. The adjusting screw 122 of the fluid regulator 100 may be adjustable via. for example, a single hex socket wrench size, a hex-shaped drive member, and/or a standard screwdriver blade. [00161 The adjusting screw 122 can be adjusted (e.g., rotated clockwise) to compress the spring 120, thereby increasing the force applied by the spring 120 to the diaphragm 1 18. Increasing the force applied by the spring 120 increases the set or outlet control pressure provided by the fluid regulator 100. Likewise, the adjusting screw 122 can be adjusted (e.g., rotated counter-clockwise) to reduce the compression of the spring 122, thereby decreasing the force applied by the spring 120 to the diaphragm 1 18. Decreasing the force applied by the spring 120 to the diaphragm 1 18 decreases the set or outlet control pressure provided by the fluid regulator 100.

[0017] An example of a known fluid regulator adjusting screw 200 configured to be adjustable by multiple tools is shown in FIG. 2. The known adjusting screw 200 is used with type B34/B38 fluid regulators manufactured by Actaris. Turning in detail to FIG. 2, the adjusting screw 200 has a cylindrical body 202 with threads 204 on its outermost curved surface. The threads 204 are configured to threadingly engage an internally threaded opening of a regulator housing and, in particular, a spring casing of such a regulator, to enable rotatable adjustment of the screw 200 (e.g., to change an outlet control pressure of a regulator). [0018] An end or face 206 of the adjusting screw 200 has a pair of raised portions or hex-shaped bosses 208 and 210, each of which is sized to engage the same size

hex socket to enable rotation of the adjusting screw 200 via a socket wrench coupled to one of the bosses 208 and 210. Additionally, the adjusting screw 200 includes a hex-shaped opening 212, which is centered relative to a longitudinal axis of the adjusting screw 200, to receive a hex-shaped drive tool. In this manner, the hex-shaped drive tool can be used to rotate the adjusting screw 200. Finally, the known adjusting screw 200 includes pairs of raised bars 214 and 216 that form opposing slots configured to receive a standard screwdriver blade, thereby enabling a field service technician to rotate the adjusting screw 200 using a screwdriver.

[0019] FIGS. 3A and 3B illustrate an example adjusting screw 300 described herein that is configured to be adjustable by multiple tools. As depicted in FIGS. 3A and 3B, the example adjusting screw 300 has a cylindrical body portion 302 having a first end or face 304, a second end or face 306, and a curved outer surface 308. The curved outer surface 308 has threads 310, which are sized to threadingly engage an internally threaded opening (not shown). The cylindrical body portion 302 and threads 310 may be sized to enable the adjusting screw 300 to be used as an adjusting mechanism on a field device such as, for example, a fluid regulator control pressure adjusting screw.

[0020] The first end 304 of the example adjusting screw 300 includes a first pair of bosses or raised portions 312 and a second pair of bosses or raised portions 314 opposing the first pair of raised portions 312. The pairs of raised portions 312 and 314 are depicted as being offset equal distances from a longitudinal axis 316 of the adjusting screw 300. However, such offsets do not have to be equal and, thus, the pairs of raised portions 312 and 314 may be spaced in other suitable manners to achieve similar results.

[0021] Each of the pairs of raised portions 312 and 314 has a geometry and size to engage a first size socket (depicted as dashed line 318 in connection with the first pair of raised portions 312). The geometry and size of the pairs of raised portions 312 and 314 enable a second size socket (depicted as dashed line 320 in connection with both pairs of raised portions 312 and 314) larger than the first socket to simultaneously engage both pairs of raised portions 312 and 314. In this manner, a socket having either the first size 318 or the second size 320 may be used to turn or rotate the example adjusting screw 300 about the longitudinal axis 316. Preferably, but not necessarily, the first size socket 318 and the second size socket 320 may be used to engage another fastening or adjusting component of a device associated with the adjusting screw 300 and/or another device typically serviced by a service person.

[0022] In the example shown in FIGS. 3A and 3B, the raised portions 312 and 314 provide angled surfaces 322, 324, 326, and 328 to engage at least one of the first and second sockets 318 and 320. More specifically, the example raised portions 312 and 314 have angled sides defining the shape of a parallelogram. Further, the raised portions 312 and 314 define respective slots 330 and 332 to receive a standard screwdriver blade to enable the adjusting screw 300 to be rotated about the longitudinal axis 316. In other examples, the slots 330 and 332 may be optionally eliminated and/or each of the raised portions 312 and 314 may be a unitary raised portion or boss rather than pairs of raised portions. [0023] The example adjusting screw 300 may also include a rectangular opening 334 between the first and second pairs of raised portions 312 and 314 that are configured to receive or engage a socket wrench drive member to rotate the adjusting screw 300 about the longitudinal axis 316. In one particular example,

the rectangular opening 334 is square and centered relative to the longitudinal axis 316. In other examples, the opening 334 may be any polygonal shape or any other suitable shape to receive a tool member such as, for example, a hex key, to rotate the adjusting screw 300 about the longitudinal axis 316.

[0024] Although certain example apparatus have been described herein, the scope of coverage of this patent is not limited thereto. On the contrary, this patent covers all apparatus and articles of manufacture fairly falling within the scope of the appended claims either literally or under the doctrine of equivalents.