Patent ID: 7593239

Claim:
A fixing device for securing a circuit board to a plate member, comprising: a spacer being located between the circuit board and the plate member and defining a coupling hole therethrough, a female thread being formed on a part of an interior surface of the coupling hole at an end thereof; a nut member comprising a pressing portion and a coupling portion extending from the pressing portion, a male thread being formed on a part of an exterior surface of the coupling portion at a free end thereof, corresponding to the female thread of the coupling hole of the spacer, a threaded hole being defined in the nut member, the coupling portion movably retained in the coupling hole of the spacer after the free end of the coupling portion with the male thread being screwed through the end of the coupling hole with the female thread, the pressing portion and the spacer cooperatively configured for sandwiching the plate member therebetween; and a fastener including a head and a threaded rod extending from the head for being screwed in the threaded hole of the nut member, the head being sandwiched the circuit board with the spacer; wherein the height of the remaining unthreaded part of the exterior surface of the coupling portion is greater than the height of the threaded part of the interior surface of the coupling hole, so that the coupling portion can be moved to allow the pressing portion to be adjacent the spacer as the threaded rod of the fastener is screwed into the threaded hole of the nut member.