Walk-Behind Floor Machine Handle Lock for Vertical Storage Stability
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Solution Overview
Problem
Existing walk-behind floor treatment machines lack an effective mechanism to secure the handle against pivoting in both axes, leading to instability when not in use.
Innovation Solution
A handle immobilization mechanism is introduced, featuring a locking system that aligns detent and indent features when the handle is in a vertical orientation, preventing pivoting by using an articulated joint and a lock actuator to secure the handle portion against up/down and side-to-side movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is made pivotable in two axes for steering and guiding, then the ease of operation is improved, but the stability of the handle when not in use deteriorates
Solution Approach 1:
The handle system transitions between two dynamic states: during operation, the handle is unlocked and pivotable in two axes (up/down and side-to-side) for steering; when not in use, the handle locks into a stable vertical position. The detent mechanism enables this dynamic behavior by allowing free movement during operation but providing positive locking when the handle returns to vertical orientation.
Solution Approach 2:
The handle automatically returns to and locks in the vertical position through its own weight and the self-latching detent mechanism. When the handle is released from steering operations, gravity causes it to return to vertical alignment, where the detent feature automatically engages with the indent feature on the strut, securing the handle without requiring external support or manual locking actions.
2Ease of operation
If the handle is secured vertically without external support, then the convenience of storage is improved, but the device complexity increases
Solution Approach 1:
The locking function is extracted as a separate, dedicated mechanism (detent feature and indent feature) independent from the steering mechanism. This modular approach allows the handle to maintain its two-axis pivotability for steering while incorporating a focused locking subsystem that only activates when the handle returns to vertical, thereby managing complexity through functional separation.
Solution Approach 2:
The detent feature acts as an intermediary element between the handle portion and the strut. This intermediate component mediates the interaction between the handle's gravitational return motion and the locking requirement, enabling automatic engagement without complex actuators or external support structures.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The present invention relates to the field of floor treatment machines for scrubbing, polishing, sanding or burnishing floors. In these machines one or more driven rotatable work heads (such as scrubbing brushes) are provided for agitating the floor surface. 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, and wherein a handle pivot lock mechanism is provided in which the adoption of a predetermined handle portion orientation permits one or more locking feature to act on one or more corresponding constraint feature so as to prevent pivoting movement of the handle portion with respect to the base portion. The predetermined handle orientation may be a vertical orientation. In the predetermined orientation the locking feature becomes aligned with the constraint feature so as to permit mutual engagement, and when the orientation is not achieved misalignment prevents engagement of the features.