Abstract In a dilatometer, of the type using a linear, variable, differential transformer that includes two pairs of cantilevered leaf springs for resiliently and independently supporting the core and the coil thereof, adjustment means are provided for axially displacing the core relative to the coil to thereby electrically zero the core. In one embodiment of the present invention, a rod is coupled to the opposed end surfaces of the core and is also threadably engaged in the two outboard springs that support the core whereby rotational movement of the rod causes axial displacement of the core relative to the coil. In an alternative embodiment of the present invention, the core is contained within a sleeve that is secured to and mounted between the two outboard leaf springs that support the core. An adjustment rod is threaded into one end of the sleeve and abuts one end of the core. A compression spring which is also contained within the sleeve and which is positioned at the end of the core opposite the rod exerts an oppositely directed restoring force on the other end of the core that is opposite the rod. The aforementioned Abstract is neither intended to define the invention of the application which, of course, is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
In combination with a dilatometer of the type using a linear, variable, differential transformer that includes an annular, axially elongated coil, an axially elongated displaceable core positioned within the coil and first and second pairs of leaf springs for resiliently and independently supporting the coil and the core, respectively, at opposite ends thereof; improved adjusting means for axially displacing the core relative to the coil independently of the supporting springs, said adjusting means comprising: a. a non-magnetic sleeve mounted between a pair of said leaf springs, said core being slidably carried within said sleeve; b. at least one internally threaded member secured to one of the leaf springs that support the core; c. rod means having a first threaded rod portion mating with said internally threaded member and an end in engagement with one end of the core whereby rotation of said first threaded portion of said rod means relative to said internal threaded member causes axial displacement of the core within said sleeve relative to the coil; and d. a spring positioned within said sleeve, said spring being interposed between the end of the core remote from said first threaded rod portion and said other core supporting leaf spring.
Claim 2
Dependent Claim
200 words
In combination with a dilatometer of the type using a linear, variable, differential transformer that includes an annular, axially elongated coil, an axially elongated displaceable core positioned within the coil and first and second pairs of leaf springs for resiliently and independently supporting the coil and the core, respectively, at opposite ends thereof; improved adjusting means for axially displacing the core relative to the coil independently of the supporting springs, said adjusting means comprising: a. a non-magnetic sleeve mounted between a pair of said leaf springs, said core being slidably carried within said sleeve; b. at least one internally threaded member secured to one of the leaf springs that support the core; c. rod means having a first threaded rod portion mating with said internally threaded member and an end in engagement with one end of the core whereby rotation of said first threaded portion of said rod means relative to said internal threaded member causes axial displacement of the core within said sleeve relative to the coil; and d. a spring positioned within said sleeve, said spring being interposed between the end of the core remote from said first threaded rod portion and said other core supporting leaf spring.
Claim 3
Dependent Claim
34 words
The adjustment means according to claim 1 wherein said first threaded portion of said rod means has a conical end that is in engagement with the end of the core that is adjacent thereto.
Claim 4
Dependent Claim
17 words
The adjusting means according to claim 1 wherein said sleeve is secured to said two supporting springs.