Hinged Safety Guard for Wide Angle PTO Joint
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Solution Overview
Problem
Current wide-angle PTO joint safety guards are difficult to operate and require excessive time to fit and remove due to their design, which obscures the implement PTO shaft attachment mechanism and lacks easy access to the shaft end yoke, making it hazardous and inefficient.
Innovation Solution
A safety guard with a hingedly connected housing that allows clamshell-like movement, featuring a locking mechanism with a lip profile matching the end bellows and internal members engaging with a groove on a guard support bearing, enabling quick opening and secure locking, thus facilitating easy access and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large diameter centre section is provided to clear the joint centre disc housing, then the safety guard meets safety requirements and clears the joint housing, but the locking mechanism becomes obscured and difficult to operate
Solution Approach 1:
The safety guard housing is divided into two separate halves that can be moved independently relative to each other. This segmentation allows one half to provide the necessary large diameter clearance for the joint centre disc housing while the other half can be positioned to provide unobstructed access to the locking mechanism, resolving the contradiction between safety clearance requirements and operational accessibility.
2Reliability
If screws or similar fasteners are used to attach the safety guard, then the guard can be securely fixed, but the time required to fit and remove the guard increases
Solution Approach 1:
The safety guard transitions from a static, permanently fastened design to a dynamic, movable design where the two housing halves can be independently positioned and locked. This allows the guard to be quickly attached and removed by simply moving the housing halves relative to each other and engaging/disengaging the locking mechanism, eliminating the time-consuming process of screwing and unscrewing multiple fasteners while maintaining secure attachment during operation.
3Ease of operation
If the safety guard is dismantled to access the shaft end yoke, then access is possible, but the small end diameter of the housing prevents adequate access
Solution Approach 1:
By dividing the safety guard housing into two separable halves, the design allows one half to be moved or removed to provide direct access to the shaft end yoke and attachment mechanism. This segmentation eliminates the need to completely dismantle the guard while the open design of the separated halves provides sufficient access space, overcoming the limitation of the small end diameter in a unified housing structure.
Data Source
AI summary
A safety guard (10) for use with a wide angle joint on an agricultural power takeoff (PTO) shaft comprises a guard housing that extends around the wide-angle joint when the guard is fitted. The guard housing comprises a first housing part (12) hingedly connected to a second housing part (14) to thereby allow the first housing part (12) and second housing part (14) to move relatively open to each other and relatively closed to each other about a hinge (19), a locking member (50, 54) to lock the first housing part (12) to the second housing part (14) in a closed condition and operable to be unlocked to allow the first housing part (12) and the second housing part (14) to be moved away from each other about the hinge. Each housing part (12, 14) includes a lip (44, 46) on one end thereof, the lip (44, 46) having a profile to match a profile of an end bellows (38) to which the guard (10) is attached. The safety guard (10) may further comprise one or more internal members (28, 30, 32, 34) to engage with a groove (25) provided in an outer surface of a guard support bearing (24). This further assists in maintaining the guard in position.