The invention relates to a crane having at least one apparatus for determining the effective counterweight of said crane comprising at least one receiver for receiving at least one counterweight body; at least one coupling that is configured to pivotably couple the receiver with the further structure of the crane; and at least one abutment that is configured to limit the pivot range of the receiver.

A cylinder of pressurized fluid, including a valve assembly housing a fluid circuit including at least one shut-off valve, the cylinder being equipped with a bonnet for protecting the valve assembly including a rigid structure delimiting a protective volume around the valve assembly, including a pressure indicating device including at least one piston sensitive to the pressure in the cylinder and mobile relative to the body of the valve assembly according to the level of pressure in the cylinder between at least a retracted first position and a deployed second position, the pressure indicating device including at least one mobile information support configured to collaborate mechanically with the piston, the information support being able to move between at least two distinct positions or states to symbolize respectively at least two levels of pressure according to the position of the piston.

A height adjustable hitch receiver is disclosed and described.

A ball mount for measuring tongue weight of a trailer is disclosed. The ball mount can comprise a ball portion for interfacing with a ball configured to couple with a tongue of a trailer, a hitch portion for interfacing with a hitch receiver associated with a vehicle, and a load measurement device associated with the hitch portion. The hitch portion can be configured to pivot relative to the hitch receiver about a fulcrum in response to a downward force on the ball, with the hitch receiver resisting rotation of the hitch portion about the fulcrum thereby inducing a load on the hitch portion. The load measurement device can be configured to determine a magnitude of the downward force on the ball based on the load on the hitch portion.

A device and method for the visual inspection of the existence of pressure within a branch line of pipe is described. A mechanical tee includes a collar portion configured to extend around a pipe. The collar portion defines an axis and includes one or more fasteners to secure the tee to the pipe. A neck portion is coupled to the collar portion. The channel of the neck portion is in fluid communication with the interior of the pipe. A seal is used to prevent leakage between the pipe and the mechanical tee. A pressure indicating device is in fluid communication with the channel of the neck portion and configured to provide a visual indication of the pressure level in the channel. The pressure indicating device may optionally include electrical contacts to communicate with a monitoring system to discern and track the pressure levels in the channel.

There is provided a sealing structure in which sealing is performed by covering a fluid passage of a housing using a displacement member that is displaceable according to change in pressure. The displacement member includes a first projecting section which is a sealing section in an outer peripheral section, and a second projecting section which is formed in an inner peripheral section rather than the first projecting section, and the housing is capable of fixing the displacement member in a state in which the first projecting section is compressed, and includes a depression section, in which the second projecting section is placed when the displacement member is fixed, in a position which faces the second projecting section.

A microfabricated pressure transducer is formed in a multilayer substrate by etching a plurality of shallow and deep wells into the layers, and then joining these wells with voids formed by anisotropic etching. The voids define a flexible membrane over the substrate which deforms when a force is applied.

A differential pressure gauge for measuring a difference in pressure present between a low pressure portion of a fluid and a high pressure portion of the fluid comprises a cylinder including an opening, a housing including an opening, and a piston extending from a first end having a visual indicator to a second end having a remote indicator. The first end of the piston is in fluid communication with the high pressure portion of the fluid and the second end of the piston is in fluid communication with the low pressure portion of the fluid. A sensor is configured to sense a presence of the remote indicator when the remote indicator is within a sensing range of the sensor. The sensor is coupled to a sensor positioning mechanism for adjusting a position of the sensor with respect to the axial direction of the housing.

A compressor unit 1 comprises a compressor 5 and a pressure meter 6. The pressure meter 6 comprises: a tubular body 18 communicating with the surge chamber 12B, a meter-piston 19 movable in the tubular body 18 in the longitudinal direction thereof by the compressed air, and a spring 20 biasing the piston 18 toward the front end. The tubular body 18 comprises a small diameter portion 18F in which a seal ring 25 of the piston airtightly contacts with the tubular body, and a large diameter portion 18R in which a gap D is formed between the seal ring and the tubular body. The large diameter portion is connected to the small diameter portion via a step K at which the insider diameter of the tubular body 18 is abruptly changed, whereby when the compressed air reaches to a specified pressure and the seal ring of the piston is moved beyond the step K, the compressed air is discharged through the gap D.

A ball mount for measuring tongue weight of a trailer is disclosed. The ball mount can comprise a ball portion for interfacing with a ball configured to couple with a tongue of a trailer, a hitch portion for interfacing with a hitch receiver associated with a vehicle, and a load measurement device associated with the hitch portion. The hitch portion can be configured to pivot relative to the hitch receiver about a fulcrum in response to a downward force on the ball, with the hitch receiver resisting rotation of the hitch portion about the fulcrum thereby inducing a load on the hitch portion. The load measurement device can be configured to determine a magnitude of the downward force on the ball based on the load on the hitch portion.