Mower Cutting Deck Gate with Vertical Pivot Axis
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Solution Overview
Problem
Existing rotary mower cutting decks with handle-operated pivotal gates are not intuitive to use, making it difficult for operators to smoothly switch between discharge and non-discharge modes, and the horizontal pivot axis limits effective intermediate positions, resulting in undesirable grass clipping deposition.
Innovation Solution
A mower cutting deck with a pivotal gate that pivots about a vertical axis, operated by a handle with a hand grip that mimics the gate's position, allowing intuitive operation and providing intermediate positions through a flexible discharge chute and Bowden cables, enabling easy switching between discharge and non-discharge modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the gate pivots about a horizontal axis, then the gate can be operated with a handle, but the operator cannot intuitively determine the correct handle position and operation is difficult
Solution Approach 1:
The handle is designed with a copying mechanism where the handle position visually replicates the gate position. When the gate is in a particular position (open, closed, or intermediate), the handle assumes the same relative position, allowing the operator to intuitively determine the correct handle position without needing to learn or refer to operating instructions.
2Adaptability or versatility
If the gate pivots about a horizontal axis, then the gate structure is simple, but intermediate positions are limited and grass clippings are deposited in an undesirable narrow band
Solution Approach 1:
The gate pivot axis is changed from a horizontal orientation to a vertical orientation. This dimensional change allows the gate to pivot through a greater range of motion, creating multiple effective intermediate positions (e.g., fully open, partially open at various angles, fully closed). These intermediate positions enable grass clippings to be deposited in broader, more desirable patterns rather than a narrow band, while the handle copying mechanism ensures intuitive operation across all positions.
3Productivity
If the discharge opening is always open, then grass clippings can be continuously discharged, but the operator must change direction frequently when passing areas where clippings should not be discharged
Solution Approach 1:
The gate is designed as a dynamic component that can be quickly pivoted between open and closed positions by the operator through handle manipulation. This dynamic capability allows the discharge opening to be opened for continuous discharge operation and quickly closed when approaching areas where clippings should not be discharged, eliminating the need to change mowing direction and minimizing time loss.
4Object-generated harmful factors
If the gate is blocked to prevent clippings discharge, then clippings are contained on the deck, but the operator cannot quickly resume discharging without changing direction
Solution Approach 1:
The gate pivot mechanism is designed for rapid operation, allowing the operator to quickly pivot the gate from closed to open position by moving the handle. This dynamic responsiveness enables the operator to block the discharge opening when needed and quickly resume discharging by simply moving the handle, without needing to change the direction of the mower or stop operation.
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 allows for intuitive operation of the gate, reducing operator confusion and improving grass clipping distribution by providing clear and intermediate positions, enhancing operational efficiency and reducing the need to change mowing direction.
Implementation Method 1
The gate is connected by a linkage to an operating handle placed near the operator's seat. The operator can swing the gate between its open and closed positions simply by moving the operating handle from one handle position to another.
Implementation Method 2
A mower cutting deck with a pivotal gate that pivots about a vertical axis
Data Source
AI summary
A mower has a rotary cutting deck with a discharge opening covered by a discharge chute. A pivotal gate is placed beneath the discharge chute to pivot relative to the discharge opening between a closed position in which the gate blocks the discharge opening and an open position in which the gate opens the discharge opening, thereby providing discharge and non-discharge modes of operation respectively. A pivotal handle can be pivoted between first and second positions to thereby pivot the gate between the open and closed positions thereof. The handle and gate are arranged so that at least some portion of the handle extends in directions relative to the mower that are the same as the directions the gate extends relative to the discharge opening so that an operator can simply position the handle by observation of the handle portion to position the handle portion in an orientation corresponding to a desired orientation of the gate.