It is known in the prior art to use wedge devices to prevent doors from opening or closing. Most such wedges are designed to hold a door open and are raked at an angle above 10 degrees. As such, they are designed to hold the weight of the door, but not to withstand a force applied by an intruder.
There have been various wedge devices patented to burglar-proof a door but most of them are also raked at an angle above 10 degrees. Resistance to unwanted entry is developed by means of teeth (serrations, spikes, nails and the like which dig into the floor under the force applied by an intruder. The previous burglar-proof wedge devices also tend to mar the floor when the device is installed by a user.
In view of the above, there is a need for a security door block which does not mar the floor but which provides sufficient resistance to withstand the force applied by an intruder. It is therefore an important object of the present invention to provide a security door block which does not mar the floor but which is effective at burglar-proofing a door. Other objects and features of the invention will be in part apparent and in part pointed out hereinafter. The invention accordingly comprises the constructions hereinafter described and their equivalents, the scope of the invention being indicated in the subjoined claims.