A bracket for holding and locking tablet-type electronic devices of various sizes securely, comprising:
- a bracket base of an inverted T shape, wherein the bracket base has a front side and a backside, the front side is concavely provided with two horizontal rail grooves and a vertical rail groove, the horizontal rail grooves are adjacent to a bottom side of the bracket base and to two corresponding lateral edges of the bracket base respectively, the vertical rail groove is adjacent to a top side and a center of the bracket base and is perpendicularly connected to and in communication with the horizontal rail grooves, and the backside has a central portion connectable to a supporting leg so that the bracket base is mountable on a plane or an object in an angularly adjustable manner through the supporting leg;
- two horizontally clamping members each comprising a horizontal rail member, a horizontally positioning post, and a horizontally blocking front member, wherein each said horizontal rail member has an end provided with a horizontally blocking lateral member, each said horizontal rail member is horizontally insertable into a corresponding said horizontal rail groove to any depth desired and is fixable in the corresponding horizontal rail groove such that a corresponding said horizontally blocking lateral member is exposed from an end of the corresponding horizontal rail groove, each said horizontally positioning post is perpendicularly and fixedly provided on a front side of a corresponding said horizontal rail member at a position adjacent to a bottom edge of the end of the corresponding horizontal rail member, and each said horizontally blocking front member is able to be fitted horizontally over a corresponding said horizontally positioning post to any depth desired and be fixed to the corresponding horizontally positioning post;
- and wherein when a said tablet-type electronic device is supported on the bracket, a distance between the two horizontally blocking lateral members is adjustable until matching a horizontal width of a bottom edge of the tablet-type electronic device, in order for the two horizontally positioning posts to support the bottom edge of the tablet-type electronic device, for the two horizontally blocking lateral members to hold two horizontally corresponding lateral edges of the tablet-type electronic device respectively, and for the two horizontally blocking front members to hold two corresponding front portions of the tablet-type electronic device respectively;
- and
- a vertically clamping member comprising a vertical rail member, two vertically positioning posts, and two vertically blocking front members, wherein the vertical rail member has an end horizontally provided with a front blocking arm, the vertical rail member is vertically insertable into the vertical rail groove to any depth desired and is fixable in the vertical rail groove such that the front blocking arm is exposed from an end of the vertical rail groove, each said vertically positioning post is perpendicularly and fixedly provided on a front side of the front blocking arm at a position adjacent to an end of the front blocking arm, and each said vertically blocking front member is able to be fitted horizontally over a corresponding said vertically positioning post to any depth desired and be fixed to the corresponding vertically positioning post;
- and wherein when the bottom edge of the tablet-type electronic device is supported by the two horizontally positioning posts, and the two horizontally corresponding lateral edges of the tablet-type electronic device are held by the two horizontally blocking lateral members respectively, the vertically blocking front members are vertically adjustable until a vertical distance therefrom to the horizontally blocking front members matches a vertical height of the tablet-type electronic device, in order for the vertically blocking front members to hold a top edge and a top front edge of the tablet-type electronic device, thereby positioning the tablet-type electronic device securely on the bracket.