Abstract: Apparatus and methods for aligning heavy metal plates during tank construction using an alignment device, which is temporarily attached to the heavy metal plates with a pair of locking members pivotably coupled to a frame and a pair of adjustable alignment members attached to the frame between the pair of locking members. The alignment device may be attached to the heavy metal plates without the inefficiencies, hazards and other disadvantages associated with welding.

Abstract: Apparatus and methods for aligning heavy metal plates during tank construction using an alignment device, which is temporarily attached to the heavy metal plates with a pair of locking members pivotably coupled to a frame and a pair of adjustable alignment members attached to the frame between the pair of locking members. The alignment device may be attached to the heavy metal plates without the inefficiencies, hazards and other disadvantages associated with welding.

Abstract: Systems and methods for scaffolding systems for use with curvilinear walls, particularly to fit about the curved wall of a holding tank and to be readily moved to varying heights of the holding talk wall.

Abstract: A self-spotting barbell press is composed of an adjustable bench and uprights located on either side of the bench adjacent the lifters upper body. Barbell support arms extend from the uprights into the barbell's pathway and have the ability to slide up and down to contact the barbell and decrease the weight exerted on the exerciser. A single hydraulic cylinder in conjunction with a pulley system provides force to each lifting arm, which is depressed below the barbell's path before use. When assistance is needed, the weightlifter places a three-way valve into a valve position that allows hydraulic fluid under pressure to flow from an accumulator tank to a hydraulic cylinder with push-rod that causes the barbell support arms to ascend removing a user-determined amount of weight from the barbell. If the total amount of weight is not to be removed, the user can continue performing repetitions with assistance from the hydraulic system. Another valve position allows only upward movement should the exerciser fail.

Abstract: A self-spotting safety bench press is composed of an adjustable bench and uprights located on either side of the bench adjacent the lifters upper body. Lifting arms extend from the uprights into the barbell's pathway and have the ability to slide up and down to contact the barbell and decrease the weight exerted on the exerciser. A single hydraulic cylinder in conjunction with a pulley system provides force to each lifting arm, which is depressed below the barbell's path before use. When assistance is needed, the exerciser releases a hydraulic restrictor valve causing the arms to ascend removing a user-determined amount of weight from the barbell. If the total amount of weight is not chosen to be removed the user can continue performing repetitions with machine assistance. A second restrictor valve allows only upward movement should the exerciser fail. A third flow restrictor valve adjusts the rate of arm travel. An air charged hydraulic accumulator provides the hydraulic pressure to the cylinder.