Abstract: The mounting bracket systems are used in pairs to support a banner on a vehicle. In a first embodiment, the system includes opposing masts having upper and lower extending tabs adapted for attaching a banner between the masts, an annular flange disposed around the mast, and a lower mast end inserted into a bushing attached to a vehicle by U-shaped mounting straps. In a second embodiment, the system includes opposing masts having upper and lower extending tabs adapted for attaching a banner between the masts. The bottom end of each mast is attached to a platform having an elongate U-shaped pocket insert having planar walls extending from the platform opposite the mast. The pocket inserts are adapted for insertion into stake pockets common to trucks and trailers that haul oversize loads. A clevis pin may be inserted through opposing walls of the pocket insert below the stake pocket.

Abstract: The lockable pivot joint can be connected to separate, first and second shaft members to facilitate pivotable connection of the shaft members. The pivot joint includes a first joint member and a second joint member pivotally connected to the first joint member. A push-button assembly for locking and un-locking the pivot joint in a plurality of positions, is connected to the members. The push-button assembly includes an elongate shank having a button at one end. A lobed member is attached to the first end of the shank and a retainer member is positioned in communicating relation with the elongate shank to secure the lobed member on the elongate shank. A biasing member is positioned between the button and the second joint member.