Floor treatment machine
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Solution Overview
Problem
Existing walk-behind floor treatment machines lack directional stability, particularly in straight-line movement and cornering, due to the lack of guiding constraints from rotating work heads and dual-pivoted handles, leading to operator fatigue and reduced productivity.
Innovation Solution
A floor treatment machine with a base portion supported by a rotatable work head and a handle portion that is pivotable, featuring a floor-engaging wheel with a fixed transverse axis of rotation, coupled to the base via a linkage that prevents yawing, allowing the handle to steer the machine by yawing the wheel, which in turn causes the base to yaw, providing improved directional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dual-pivoted handle is used to permit easy side-to-side sweeping movements, then ease of operation is improved, but directional stability deteriorates
Solution Approach 1:
The handle assembly is segmented into multiple functional components: a first pivot joint for vertical movement, a second pivot joint for horizontal movement, and a steering wheel mechanism. This segmentation allows each component to perform its specific function independently, providing ease of operation while maintaining directional stability through the fixed transverse axis of the wheel means.
Solution Approach 2:
The linkage mechanism acts as an intermediary between the wheel means and the base portion. It transmits steering inputs while constraining yawing motion, thereby mediating between the operator's steering actions and the machine's directional stability. The linkage includes a pitman arm and a drag link that work together to convert wheel steering into controlled base portion movement.
2Ease of operation
If rotating work heads are used without guiding constraints, then ease of operation is improved, but directional stability deteriorates
Solution Approach 1:
The linkage mechanism serves as an intermediary that connects the wheel means to the base portion, transmitting steering commands while preventing unwanted yawing. This intermediary structure provides the necessary guiding constraints to maintain directional stability while preserving the ease of operation provided by the rotatable work heads.
Solution Approach 2:
The system changes the parameter of rotational freedom by allowing the work heads to rotate freely for ease of operation, while simultaneously constraining the base portion's yawing through the linkage. This selective parameter control enables both ease of operation and directional stability to coexist.
3Ease of operation
If the handle is made highly maneuverable with multiple pivots, then ease of operation is improved, but control precision deteriorates
Solution Approach 1:
The handle assembly is divided into segmented pivot joints, each with a specific degree of freedom. The first pivot allows vertical movement for navigating height variations, while the second pivot allows horizontal movement for steering. This segmentation provides ease of operation while the fixed transverse axis of the wheel means maintains control precision by preventing uncontrolled yawing.
4Ease of operation
If the machine is designed for easy turning, then ease of operation is improved, but directional stability deteriorates
Solution Approach 1:
The linkage mechanism acts as an intermediary that enables easy turning through the articulated joints while simultaneously preventing excessive yawing of the base portion. The pitman arm and drag link work together to convert wheel steering into controlled turning motions, maintaining directional stability even during sharp turns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances directional control and stability, allowing for more efficient straight-line movement and cornering, reducing operator fatigue and increasing productivity by maintaining a stable scrubbing deck and preventing skidding or slipping.
Implementation Method 1
the wheel means having a substantially transverse axis of rotation so as to permit travel in the working direction, the wheel means being coupled to the base portion by a linkage which permits vertical travel of the base portion and work head or heads with respect to the wheel means, but which provides transverse constraint to limit or prevent yawing of the base portion with respect to the wheel means
Implementation Method 2
a lower region of the handle portion is pivotably connected to the wheel means via an articulated joint which permits up/down pivoting of the handle about the joint and side-to-side pivoting of the handle about the joint
Implementation Method 3
the linkage which permits vertical travel of the base portion and work head or heads with respect to the wheel means, but which provides transverse constraint to limit or prevent yawing
Implementation Method 4
the arrangement being such that the handle portion may be manipulated to act on the wheel means so as to yaw steer the wheel means about a yaw axis defined by the floor-engaging contact of the wheel means, the yawing of the wheel means causing the base portion to yaw in response to yaw steering
Data Source
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AI summary
The present invention relates to the field of floor treatment machines for scrubbing, polishing, sanding or burnishing floors, and in particular machines in which one or more driven rotatable work heads (such as scrubbing brushes) are provided for agitating the floor surface. In one aspect there is provided a walk-behind floor treatment machine comprising: a base portion provided with and supported by at least one rotatable work head for treating the floor, a handle portion for steering or guiding the machine along a working direction of travel and adapted to be pivotable with respect to the base portion, drive means for rotating the work head with respect to the base portion, floor-engaging wheel means for supporting the handle portion, the wheel means having a substantially transverse axis of rotation so as to permit travel in the working direction, the wheel means being coupled to the base portion by a linkage which permits vertical travel of the base portion and associated work head or heads with respect to the wheel means, but which provides transverse constraint to limit or prevent yawing of the base portion with respect to the wheel means, wherein a lower region of the handle portion is pivotably connected to the wheel means via an articulated joint, the arrangement being such that the handle portion may be manipulated to act on the wheel means so as to yaw steer the wheel means about a yaw axis defined by the floor-engaging contact of the wheel means, the yawing of the wheel means causing the base portion to yaw in response to yaw steering. The wheel means may comprise a wheel, roller or ball, preferably a single wheel, roller or ball, disposed at a lower region of the handle portion. The wheel means preferably has a fixed transverse axis of rotation.