Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
201 words
A fluid pressure failure detector detecting pressure failure in a system having two independent fluid circuits, comprising: a housing having formed therein a bore and one pressure chamber at each end of said bore, the bore being smaller in crosssection than the pressure chambers to define a pair of shoulders at the junctions of the ends of the bore with the corresponding pressure chambers; ports connecting each pressure chamber with one of said fluId circuits; a movable piston assembly slidably received in said bore, said piston assembly being substantially the same length as said bore; a pair of resilient discs of elastomeric material, the outer circumferential surface of each disc being sealingly and slidably received in one of said pressure chambers with a peripheral portion of one face of each of the discs engaging a corresponding one of said shoulders and the remaining portion of said one face of each of the discs engaging one end of said piston assembly and switching means operatively connected to said housing and said piston assembly and actuated in response to movement in either direction of the piston assembly as a result of a pressure difference denoting a failure in one of said fluid circuits.
Claim 2
Dependent Claim
201 words
A fluid pressure failure detector detecting pressure failure in a system having two independent fluid circuits, comprising: a housing having formed therein a bore and one pressure chamber at each end of said bore, the bore being smaller in crosssection than the pressure chambers to define a pair of shoulders at the junctions of the ends of the bore with the corresponding pressure chambers; ports connecting each pressure chamber with one of said fluId circuits; a movable piston assembly slidably received in said bore, said piston assembly being substantially the same length as said bore; a pair of resilient discs of elastomeric material, the outer circumferential surface of each disc being sealingly and slidably received in one of said pressure chambers with a peripheral portion of one face of each of the discs engaging a corresponding one of said shoulders and the remaining portion of said one face of each of the discs engaging one end of said piston assembly and switching means operatively connected to said housing and said piston assembly and actuated in response to movement in either direction of the piston assembly as a result of a pressure difference denoting a failure in one of said fluid circuits.
Claim 3
Dependent Claim
24 words
A detector as claimed in claim 1, wherein a spring member is provided between each resilient disc and the end of each pressure chamber.
Claim 4
Dependent Claim
35 words
A detector as claimed in claim 2, wherein the spring member is a boss of elastomeric material integral with the resilient disc and having a surface bearing on the end of the associated pressure chamber.
Claim 5
Dependent Claim
30 words
A detector as claimed in claim 3, wherein a passage is formed in the end of at least one pressure chamber, at the place which is engaged by the boss.
Claim 6
Dependent Claim
60 words
A detector as claimed in claim 1, wherein the switching means comprise a ring movable with the movable piston assembly and two spaced apart contact strips insulatingly secured to the housing, the ring being situated between the strips and spaced from the strips when the piston assembly is in the position in which it is entirely contained within the bore.
Claim 7
Dependent Claim
61 words
A detector as claimed in claim 5, wherein the outer edge of the ring is received in a circular groove formed in the bore, the groove comprising two furrows connected by inclined surfaces to a central rib and the inner edge of the ring is retained in a space situated between two cylindrical members which make up the movable piston assembly.
Claim 8
Dependent Claim
49 words
The invention of claim 4, wherein another passage is formed in the end of the other pressure chamber and communicating with the latter, one end of said another passage entering said other pressure chamber at the place where the corresponding boss engages the wall of the other pressure chamber.