Obviousness Analysis under 35 U.S.C. § 103 for US Patent 9975750

This analysis will assess the obviousness of US Patent 9975750, "Low profile compact tool carriers," under 35 U.S.C. § 103, considering the provided prior art. The person having ordinary skill in the art (PHOSITA) in this field would be an engineer or technician with practical experience in designing and manufacturing compact utility loaders, skid steers, or similar earth-moving equipment. This individual would possess knowledge of mechanical linkages, hydraulic systems, ergonomic design for operator controls, and considerations for machine stability and maneuverability in tight spaces. They would also be familiar with relevant industry standards like ISO 6165 and SAE J2752 for compact tool carriers. The PHOSITA is considered to have ordinary creativity, not to be an inventor or a genius, and is expected to follow conventional approaches and apply known techniques in a predictable manner.

The patent generally aims to reduce the mainframe size, lower the center of gravity, improve operator visibility, and achieve a more effective vertical lift path for the loader.

Independent Claim 1 Analysis

Claim 1: A compact tool carrier configured for standing operator control and having a longitudinal axis and a mass of less than about 1500 kg, the compact tool carrier comprising:

• a loader having an arm, the loader being adapted to carry a tool;
• a mainframe for supporting the loader, the mainframe having a first side and a second side, the loader being free from direct attachment to the mainframe;
• a first linkage pivotally attached to the first side of the mainframe at a first pivot point and pivotally attached to the loader arm at a second pivot point;
• a second linkage pivotally attached to the first side of the mainframe at a third pivot point and pivotally attached to the loader arm at a fourth pivot point;
• an actuator directly pivotally attached to the first side of the mainframe at a fifth pivot point and directly pivotally attached to the loader arm at a sixth pivot point, the fifth pivot point being distinct from the first pivot point and the third pivot point;
• a control station having operator controls for propelling the compact tool carrier forward and for raising and lowering the loader, the control station being mounted toward the rear of the compact tool carrier;
• an operator platform for standing operation of the operator controls of the control station; and
• an engine disposed forward of the operator platform relative to the longitudinal axis.

Combination 1: US20080197588A1 (Toro Company) + US7695236B2 (Green) + General Knowledge of Compact Tool Carriers

• US20080197588A1 (Toro Company) - Platform assembly and working vehicle incorporating same: This reference discloses a working vehicle with a platform assembly and an operator platform for standing operation. It also describes a control station for operating the vehicle. This reference would teach the concept of a compact tool carrier with standing operator control, a control station mounted towards the rear, and an operator platform.
• US7695236B2 (Green) - Utility vehicle: This patent describes a utility vehicle with a loader, including loader arms and an attachment for tools. It also depicts a mainframe and the use of hydraulic cylinders (actuators) for lifting the loader. While not specifically detailing a multi-linkage, low-profile system, it provides a foundational understanding of compact utility loaders with loaders and actuators.
• Motivation to Combine: A PHOSITA, aiming to improve the functionality and ergonomics of compact tool carriers for standing operators, as seen in US20080197588A1, would be motivated to integrate a robust loader system, such as that generally described in US7695236B2. It is a common design choice in the art of compact equipment to use multiple linkages and actuators (e.g., a four-bar linkage system with a hydraulic cylinder) to achieve desired lift paths and stability for a loader. The problem of providing an effective and stable loader on a compact, stand-on machine would naturally lead a PHOSITA to consider known loader designs, including those with multiple pivotally attached linkages and actuators to control the loader arm's movement. Placing the engine forward of the operator platform is a conventional layout in compact utility equipment to optimize weight distribution and provide space for the operator. The feature of the loader being "free from direct attachment to the mainframe" is inherent in any design utilizing linkages for pivotal attachment. The specific arrangement of distinct pivot points for the linkages and actuator is a standard mechanical engineering design practice for controlling the trajectory and force of a loader arm.

Independent Claim 19 Analysis

Claim 19: A compact tool carrier having a longitudinal axis and comprising:

• a loader adapted to carry a tool;
• a mainframe for supporting the loader, the mainframe having a first side and a second side, the loader being free from direct attachment to the mainframe;
• a first linkage pivotally attached to the first side of the mainframe at a first pivot point and pivotally attached to the loader at a second pivot point;
• a second linkage pivotally attached to the first side of the mainframe at a third pivot point and pivotally attached to the loader at a fourth pivot point;
• an actuator pivotally attached to the first side of the mainframe at a fifth pivot point and directly pivotally attached to the loader at a sixth pivot point;
• a drive mechanism for propelling the compact tool carrier over a supporting surface, the drive mechanism having a drive sprocket defining a rotational axis R, the compact tool carrier having a bottom at which the drive mechanism contacts the supporting surface, the rotational axis R and the bottom of the compact tool carrier being separated by a vertical distance D1, the rotational axis R and a bottom of the first side of the mainframe being separated by a vertical distance D5, the rotational axis R and each of the first, third, and fifth pivot points being separated by a vertical distance, the vertical distance between the rotational axis R and the first pivot point being less than 1.5 times D1, the vertical distance between the rotational axis R and the third pivot point also being less than 1.5 times D1, the vertical distance between the rotational axis R and the fifth pivot point also being less than 1.5 times D1, the first side of the mainframe comprising a forward-most pivot point, the first pivot point, the third pivot point, or the fifth pivot point being the forward-most pivot point, the vertical distance between the rotational axis R and the forward-most pivot point being less than twice D5;
• a control station having operator controls for propelling the compact tool carrier forward and for raising and/or lowering the loader, the control station being mounted toward the rear of the compact tool carrier;
• an operator platform for standing operation of the operator controls of the control station; and
• an engine disposed forward of the operator platform relative to the longitudinal axis.

Combination 2: US6695568B2 (Clark Equipment Company) + US20070128012A1 (Yamada) + General Engineering Principles

• US6695568B2 (Clark Equipment Company) - Low profile lift arm for small skid steer loader: This reference explicitly addresses a "low profile lift arm for small skid steer loader," indicating a clear recognition in the prior art of the desire for reduced machine height and improved operator visibility. It teaches a compact loader design where the pivot points are positioned to achieve a low profile. While the specific numerical relationships (e.g., 1.5 times D1, twice D5) may not be explicitly stated, the underlying concept of designing a mainframe with low-positioned pivot points for loader arms is present. The patent also discusses loader arms, linkages, and actuators.
• US20070128012A1 (Yamada) - Industrial vehicle having working implement: This patent discloses an industrial vehicle with a working implement (loader), a drive mechanism with a rotational axis, and an understanding of vertical distances relative to the vehicle's bottom and frame. This reference, combined with general engineering principles, would teach a PHOSITA how to analyze and manipulate the spatial relationships between a drive mechanism's rotational axis, the ground contact point (D1), and various pivot points on a mainframe to achieve specific design objectives like a lower center of gravity or reduced overall height.
• Motivation to Combine: A PHOSITA, motivated by the recognized need for low-profile compact tool carriers with improved stability and operator visibility (as highlighted by US6695568B2), would combine the teachings of US6695568B2 with general engineering principles and the spatial understanding from US20070128012A1. The goal of a low-profile design inherently drives the placement of components, including pivot points, as low as practically possible on the mainframe. Quantifying these "low profile" features with specific ratios (e.g., "less than 1.5 times D1" and "less than twice D5") would be a matter of routine design optimization for a PHOSITA. Reducing the vertical distance of pivot points relative to the drive mechanism's rotational axis and the mainframe's bottom is a direct and obvious way to achieve a lower profile and center of gravity, improving stability as explicitly desired in the prior art. The other elements of Claim 19 (loader, mainframe, linkages, actuator, rear-mounted control station, operator platform for standing, and engine forward of the platform) are also found in the prior art as discussed in Combination 1 and are conventional features of compact tool carriers. Therefore, defining specific dimensional relationships within a low-profile design would be an obvious optimization for a PHOSITA.