Massage apparatus having massage rollers mounted to an arm housing which includes improved slider arrangement

What is this patent about?

’140 is related to the field of automated massage apparatuses, specifically those designed for mattress or chair configurations that provide therapeutic pounding and kneading actions. Traditional systems often struggle with mechanical complexity and excessive part counts when attempting to switch between different massage modalities. This complexity frequently leads to manufacturing inefficiencies, increased costs, and mechanical looseness in the massage rollers over time, which degrades the quality of the massage experience for the user.

The underlying idea behind ’140 is a dual-shaft drive architecture integrated into a reciprocating carriage that simplifies the transition between pounding and kneading. By utilizing a first drive shaft with eccentric portions for vertical pounding and a second drive shaft with inclined eccentric cams for lateral kneading, the invention allows a single motor to selectively drive different mechanical outputs. The key engineering insight lies in the modular arm construction, where a slider is sandwiched directly between a molded housing and a cover, eliminating the need for separate spacers and complex mounting hardware.

The claims of ’140 focus on a holding body assembly that translates along guide rails and houses a pair of multi-functional massage arms. Each arm is uniquely constructed from an arm housing and an arm cover that, when bonded together, form an internal track for a sliding interface. This slider is coupled to the second drive shaft’s eccentric cams, allowing the arms to oscillate laterally for kneading. Simultaneously, the proximal ends of these arms are mounted to the first drive shaft’s eccentric portions to facilitate the vertical pounding motion, with a drive mechanism selectively engaging either shaft.

In practice, the invention utilizes a reversible motor and a system of one-way clutches to determine which drive shaft receives power based on the direction of motor rotation. When the kneading shaft is engaged, the sliders move within the arm holding portions to translate the circular motion of the cams into a smooth, pivoting oscillation of the massage rollers. To ensure precision and eliminate mechanical play, the arm assembly incorporates deformation screws that expand specific sections of the housing to tighten the fit against the slider, ensuring the rollers remain firm and responsive during operation.

This approach differs from prior solutions by replacing stacked, multi-part slider receivers with a unified housing-and-cover design that serves as both the structural frame of the arm and the guide track for the slider. By molding the roller support shafts directly into the arm housing and using the bonding surface of the cover to secure the internal sliding components, the invention significantly reduces the number of fasteners and discrete parts. This results in a more rigid mechanical linkage that is easier to assemble, more durable under the heavy loads of a user's body weight, and less prone to developing the 'looseness' common in traditional massage mechanisms.