A pressure-applying telescopic spacer comprising: (a) an inner tube and an outer tube telescopically coupled to one another; (b) blocking means (4,5,6,7) for blocking the axial movement between the tubes (1, 2); said blocking means comprising: a. sheet metal rings placed on top of one another forming a block through which there passes with clearance the inner tube; b. a spring; and c. a part (6,7) anchored on the outer tube; wherein said sheet metal rings are assembled on said part (6,7) supported thereon through a portion of said rings whereas on the opposite portion of said sheet metal rings said spring is supported wherein on said opposite portion said spring applies pressure which is intended for pivoting said rings from an inoperative portion enabling the movement of said inner tube with respect to the outer tube towards a wedged position in which the aforementioned sheet metal rings are driven on the inner tube establishing the blocking of said inner tube so as to prevent its axial movement in the retracting direction with respect to the outer tube; wherein the part (6,7) in which the sheet metal rings are arranged is formed by a sort of long sleeve with one end provided with anchoring and immobilizing means for being anchored and immobilized on the outer tube, whereas the opposite end of such sleeve has a head-like expansion for the location of the sheet metal rings and of the spring itself for pushing the former; wherein the sleeve with its head-like expansion, the sheet metal rings and the spring therein, form a manually operated handle-like assembly which enables handling the spacer to reach the desired length using only one hand; characterized in that said pressure-applying telescopic spacer also comprises: (c) a first support plate assembled at the lower end of the outer tube and connected with said lower end of the outer tube through a rod and a sleeve with a spring, said sleeve with a spring being provided inside the end of the outer tube, determining an approximation mechanism which gives way when it is operated to reduce the dimension or length of the spacer; and (d) a second support plate assembled at the upper end of the inner tube wherein said second support plate is connected with the inner tube through a threaded rod with a threaded sleeve established inside the upper end of the inner tube, forming a pressure-applying mechanism; such that in the rotation of said handle-like assembly of the spacer an increase or decrease of the final distance of the spacer itself or its pressure on the surfaces between which it is applied will be established depending on the rotation direction carried out; and wherein the first and second support plates are pivotally assembled through a pin functioning as a pivoting shaft, which allows varying the inclination of said support plates and their positioning on any type of surface, whether they are parallel, perpendicular or forming an angle with one another. (a) an inner tube and an outer tube telescopically coupled to one another; (b) blocking means (4,5,6,7) for blocking the axial movement between the tubes (1, 2); said blocking means comprising: a. sheet metal rings placed on top of one another forming a block through which there passes with clearance the inner tube; b. a spring; and c. a part (6,7) anchored on the outer tube; a. sheet metal rings placed on top of one another forming a block through which there passes with clearance the inner tube; b. a spring; and c. a part (6,7) anchored on the outer tube; (c) a first support plate assembled at the lower end of the outer tube and connected with said lower end of the outer tube through a rod and a sleeve with a spring, said sleeve with a spring being provided inside the end of the outer tube, determining an approximation mechanism which gives way when it is operated to reduce the dimension or length of the spacer; and (d) a second support plate assembled at the upper end of the inner tube wherein said second support plate is connected with the inner tube through a threaded rod with a threaded sleeve established inside the upper end of the inner tube, forming a pressure-applying mechanism; such that in the rotation of said handle-like assembly of the spacer an increase or decrease of the final distance of the spacer itself or its pressure on the surfaces between which it is applied will be established depending on the rotation direction carried out;