Fixing clamp for connecting sheets with different expansion properties

A fixing clamp for connecting a sheet having an expansion property with a support plate having a different expansion property, such that the support plate includes an outer edge and a rectangular opening having a front longitudinal edge and an opposed rear longitudinal edge that receives the fixing clamp, and the fixing clamp is displaceable parallel to the edge of the support plate, the fixing clamp comprising:

• a rectangular base plate of spring steel having an upper surface and lower surface, and a front transverse edge and an opposed rear transverse edge;
• a threaded sleeve in the center of the base plate;
• a pair of clamping limbs integrally formed along both front and rear transverse edges of the base plate, and pointing in the same direction, wherein the front clamping limb on the front transverse edge can be inserted through the opening in the support plate and is clamped in position on a longitudinal edge of the opening in the support plate, and the rear clamping limb on the rear transverse edge can simultaneously be clamped in position on the support plate outer edge;
• and
• a pair of spring webs formed in the base plate on both sides of the threaded sleeve, wherein the spring webs are obliquely bent upward in the same direction as the clamping limb, and an end of the spring web is bent downwardly towards the upper surface of the base plate, wherein a distance “A” between the end of the spring web and a transverse leg of the front clamping limb is equal to or less than a distance “B” between the front and rear longitudinal edges of the rectangular opening.