In order to access the supported barbell 17, the weight lifter aproaches exercise rack 10a from the front and positions himself between floor runners 30. Floor runners 30 are sufficiently widely spaced and extend far enough forward of cross bar 36 to accommodate a full range of weight lifting foot placements without interference. The weight lifter grips barbell 17 in the desired manner, and may make last minute adjustments of the placement of racks 18. Racks 18 permit barbell 17 to be lifted freely therefrom, and guide barbell 17 back onto rollers 84 as the barbell is lowered. While barbell 17 is being lowered, if it is held too closely to support stand 14, the barbell will contact guide plates 86 and slide down angled sides 88 until it is firmly seated on rollers 84.
In the operation of exercise rack 10a, shown in FIGS. 1-3, either vertical adjustment mechanism 20 or horizontal adjustment mechanism 22 may be adjusted independently. In order to adjust the height of racks 18, motors 68 are simultaneously activated by a common switch mechanism (not shown). When activated, motors 68 rotate the threaded shaft within jack casings 66, raising or lowering rods 70 simultaneously. As rods 70 rise, tubes 62 simultaneously rise on posts 50, thereby raising cantilever arms 16 and racks 18. Similarly, when rods 70 are lowered, racks 18 are also lowered. Since telescoping stands 14 are adjusted by the electromechanical actuator, tube 62 is positively, rigidly held in the desired position. Any slippage problems associated with hydraulic or other actuators are avoided. However, a hydraulic actuator or the like could alternatively be used to adjust the height of stands 14 in place of jacks 66, but an electromechanical jack is preferred. An electromechanical jack is particularly preferable when exercise rack 10a is to be used to support very large weights and the danger of slippage is thus increased.
In the embodiment shown in FIGS. 6-8, barbell exercise rack 10c is a single post device. Support base 12 includes a pair of laterally spaced floor runners 130 each having a partially tapered front end 132. A joining cross bar 134 (FIG. 6) is welded between the rear ends of floor runners 130 and a cross bar 136 is welded between floor runners 130 intermediate cross bar 134 and tapered front ends 132. As shown in FIG. 7, a bracket 138 is welded intermediate runners 130 so as to extend between cross bar 134 and support stand 14c. A pair of wheels 140 are mounted to the rear of opposite ends of cross bar 134 by brackets 142. Wheels 140 are raised a slight distance above the floor surface and are used in the transport of exercise rack 10c.
As shown in FIGS. 1-2, floor runners 30 extend farther forward of support stand 14 than do racks 18. The center of gravity of exercise rack 10a and the supported barbell 17 will therefore always remain rearward of the tapered front ends 32 of floor runner 30 and prevent exercise rack 10a from inadvertently tipping over, even if a great weight is dropped onto racks 18. Thus, additional weights are not required to be added to stand 12 to stabalize exercise rack 10a. Additionally, since elongated tube 62 slides over post 50, even if jacks 66 fail, barbell 17 will be prevented from falling onto the weight lifter when tubes 62 contact slide plates 52.