Abstract: Custom sized wrench flats of a relatively large dimension are weld attached to a round stock socket of a post-assembled pressure gauge. This enables cost effective pre-assembly of the gauge components while complying with code standard size requirements for the wrench flats.

Abstract: A Bourdon tube and its method of manufacture comprised of a displaceable portion having an arcuate extent of between 170 degrees and 190 degrees, with a controlled size opening contained in the edge face of each end. Secured pressure tight in one end opening is a capillary forming the non-displacement portion of the Bourdon tube, while secured pressure tight in the other end is a seal plug forming the tube tip of the Bourdon tube.

Abstract: A pressure gauge in which the mechanical movement that drives the pointer from displacement motion of the Bourdon tube is supported by a bracket of Y-shaped configuration. Comprising the bracket is an integral folded composition defining spreadable support arms joined to an elongated tab adapted for connecting the bracket to the gauge mechanism.

Abstract: A pressure gauge having a rotatably secured Bourdon tube, and a dial plate arcuately displaceable for effecting zero calibration of the gauge includes a rotationally presettable key for registered placement within a key-slotted receptacle in which the gauge is to be utilized. Keying is provided by a simulated Y-shaped washer mounted in an annular groove on the gauge stem and arcuately secured post-calibration at a predetermined angular setting from a reference point on the gauge dial.

Abstract: Bourdon tubing is constructed from metal strip by roll forming the strip into a desired tubular cross section with the opposed edges abutting longitudinally at a location in the cross section at which contemplated operational stresses are predetermined to be relatively low. After continuously welding the edges in a pressure-tight relation, the tubing can be shaped along its length into a Bourdon tube configuration without need for further metallurgical mill processing.

Abstract: A leak-proof joint between a stainless steel gauge case and the brass socket of a pressure gauge includes a stainless steel sleeve brazed to the socket in the area of the case connection for enabling the gauge case to be welded thereto.

Abstract: Method and apparatus for constructing a pressure gauge in which the socket and at least a portion of the movement for driving the pointer are initially formed integral of a molded polymeric plastic composition.

Abstract: A pressure gauge for a foot pump comprises a housing having a connector portion on an exterior wall thereof which is formed integrally with the housing in a one-piece construction. The connector portion of the one-piece construction includes coupling members formed integrally therewith for connection to a foot pump and to a hose, and includes interior bores which define a chamber for a ball check valve and which also communicate the interior of the connector portion with the interior of the housing. The pressure gauge is preferably of the Bourdon-tube type and includes a spring tube which is pressed into a bore that extends from the interior of the connector portion through an adjacent end wall of the housing portion of the one-piece construction.

Abstract: A manometer body is electroerrosively formed with an arcuate hole having a tubular core with the body of the core being simultaneously formed in the electrical machining operation so that the Bourdon tube is fixed in place by soldering with a minimum of solder.

Abstract: Amplifier apparatus for providing output motion correlated to condition change motion or deflection of a condition responsive element. The amplifier in a preferred embodiment is mounted onto the condition responsive element for floating conjoint movement therewith. A remotely connected actuator, extending into the motion path, defines a pivot axis for a hinged gear sector arm of the amplifier. In pivoting about the actuator axis, the sector arm operably drives a rotatable output shaft supporting a pointer or the like.

Abstract: A spring manometer measuring system that includes a deviation detector spring in the manometer connected to an indicator by a tie rod, and the spring is subjected to a reference pressure for spring deflection measurement before producing the bearing for the tie rod.

Abstract: A pressure gauge has a Bourdon tube element and a pointer mechanism supported on an inner support member which is substantially contained inside the case body of the gauge. The inner support member has a bore in communication with the inner space of the Bourdon tube. The case body has a flattened, outwardly projecting wall zone surrounding a first aperture. An end surface of the inner support member has a contour adapted to the contour of the case wall zone. The matching contours serve to position the inner support member and an outer connection member threads into the inner support member to hold it tightly in place. Seals are provided between the inner support and outer connection members and between the outer connection members and the case body. An air cushion sits on top of the dampening fluid. The air cushion is vented through a vent plug having a longitudinal bore that is terminated by a cross hole transverse to the bore.

Abstract: The casing wall about the aperture through which the Bourdon tube socket connection is received in a pressure gauge cooperates with at least two contiguous surface areas spaced apart on the socket to form a bidirectional casing-to-socket interlock thereat. By means of fasteners securing the casing to the socket, the bidirectional interlock is maintained as to afford the casing increased resistance against a percussive blow of potentially bending magnitude received in either direction.

Abstract: The floating amplifier of a pressure gauge is mounted onto the free end of the Bourdon tube at various effective spacings therefrom correlated to offset any residual tip travel of the individual Bourdon tube.

Abstract: Pointer zero adjustment in a pressure gauge is effected by means of a shaft (50) centrally extending laterally inward of the casing from a supportive centering flange (40) on the inside face of the crystal (10). A Bourdon tube (44) is radially coiled concealed from view through the crystal (10) about a pressure sealed rear portion of the shaft (50) to which it is rotationally secured. The pointer unit (42) is of a more or less U-shaped cross section with a tubular center (48) loosely supported on the shaft (50) juxtaposed to the crystal (10). The front pointer formation (42) simulates a conventional pointer appearance while its rear formation (52) is rotatably linked to the free end (56) of the Bourdon tube for incurring operational displacement therewith. On removing a detachable cover (37) from over an aperture (34) in the crystal coincidingly located opposite the shaft end thereat, access is provided for an external tool (78) to operationally engage a tool receiving hex socket (38) in the shaft end.

Abstract: The Bourdon tube socket of a pressure gauge is constructed of an extruded metal bar having a first as-extruded slot in which to secure the inlet fixed end of a Bourdon tube. The bar also includes a pair of second as-extruded parallel slots for receipt of case mounting, self-tapping screws and formed of spaced apart arcuate ears extending transversely along each side face thereof.

Abstract: The front edge (2) of a manometer casing (1) is curved inwardly and secures the window shield (3), located in a sealing ring (5), against being pushed out upon superatmospheric pressure in the housing. A partition (17), in which slotted holes (18, 20, 21) are provided for the indicator shaft (19) and for the bolts (16), is arranged between the support (8) for the indicator mechanism (13) and for the bourdon tube (14) and the dial (15), which is held by bolts (16) at a spacing from said support. The slotted holes extend in a direction running from one casing hole (7) to the axis (29) of the housing and are measured to be sufficiently long, so that the support (8) with the dial (15) and the longitudinally displaceable partition (17) located between them is insertable through the rear opening (24) of the casing (1), wherein an extension (10) on the support (8) is to be outwardly displaced through the casing hole (7).

Abstract: A pressure gauge assembly for aircraft tires and the like having a helical coil bourdon tube sensor capable of indicating a pressure differential between a monitored source of pressure and a calibrated reference source of pressure. The reference pressure is applied to one surface of the bourdon tube coils while the monitored pressure is applied to the other surface of the coils. The resultant movement is a linear indication of any pressure differential. A valve assembly can be provided with the pressure gauge assembly to permit fluidic access to the monitored pressure. If the volume of the monitored pressure is variable such as an aircraft tire, the secondary source of calibrated pressure can be provided with a predetermined pressure relative to the normal tire pressure to compensate for any volumetric changes in the tire during operation. In an alternative embodiment, the bourdon tube can be used to monitor the pressure in a fire extinguisher for indicating any leaks.

Abstract: A method for assembling a pressure gauge which employs a removable metal safety plate. The gauge movement, comprising a Bourdon tube, pointer, gauge dial and gear mechanism is mounted on both sides of a metal safety plate and the entire assembly is then inserted into the gauge case and fastened in place.

Abstract: An improved construction for securing the connecting link from the free end of a Bourdon tube to the segment gear in the geared movement of a pressure responsive instrument. An elongated flat spring clip, recessed in its center portion, has one open end from which it is longitudinally slotted inward. The opposite end is screw tapped for acting as a nut to receive a screw fastener. By a slip fit insertion of the spring clip over a controlled recess on the segment shaft, the clip is held in place in a controlled tensioned grip for captivating the nut at the fastener location of the segment gear. Should it be necessary to shift the fastener location for purposes of calibrating the instrument, the spring clip is finger slideable for relocation as required.

Abstract: A pressure gauge has a plate on one face of which is mounted a flange portion which extends outwardly substantially at right angles from the plate. The flange has arranged therein an opening for receiving a mounting having an upper face and being adapted to receive a bourdon-like tube, this tube having a portion which extends from said mounting in the form of a hook. Preferably the hook-shaped tube portion has a straight section which forms an angle of about 45.degree. with said upper face, and a curved section which ranges with the straight section and which embraces a pointer mechanism.