Moisture-Proof Sleeve Block for Hoist Motor Protection
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Solution Overview
Problem
Moisture entering the lifting motor of hoists used for trusses shortens their lifespan and requires frequent maintenance due to their outdoor construction and vertical chain or line configuration.
Innovation Solution
A moisture-proof sleeve block with a five-sided casing that shields the motor and chain from external moisture, featuring a rotatable wheel and chain configuration that directs moisture away from the motor, preventing it from entering and extending the chain at an angle to facilitate downward drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the chain extends vertically in a motor-down configuration, then the hoist structure is simple and compact, but moisture travels downward on the chain and enters the motor, shortening its lifespan
Solution Approach 1:
The patent changes the chain configuration from a purely vertical arrangement to one that includes horizontal or angled segments. The chain extends from the motor in a direction that is not directly downward, creating a path that prevents moisture from traveling along the chain into the motor. This dimensional change in chain routing solves the moisture infiltration problem while maintaining structural simplicity.
2Ease of manufacture
If the chain extends vertically downward from the motor, then the hoist design is straightforward, but moisture continuously enters the motor requiring frequent maintenance
Solution Approach 1:
The patent extracts the motor from the direct vertical path of moisture flow. By positioning the motor such that the chain extends in a direction away from downward-traveling moisture, the motor is effectively removed from the harmful environmental exposure zone. This extraction eliminates the need for frequent maintenance while keeping the overall design straightforward.
3Volume of moving object
If the motor is positioned in a vertical chain configuration, then the hoist occupies minimal space, but moisture exposure continuously degrades the motor
Solution Approach 1:
The patent introduces an intermediary chain configuration that acts as a barrier between the moisture environment and the motor. The chain is routed through guides or along a path that prevents direct moisture contact with the motor, serving as a protective intermediary structure. This maintains compact spacing while blocking the harmful moisture pathway.
Data Source
AI summary
A sleeve block includes a frame that is connectable to an object, such as a truss, that is to be moved relative to a stationary support. An axle defining a longitudinal axis and a motor are to the frame. The sleeve block includes a line that has a first end connected to the motor. The line extends downward from the motor around at least a portion of the axle and then extends outwardly of the frame so that at least a portion of the line is operatively connected to the stationary support. The portion of the line between the axle and the stationary support creates a line axis, and the motor is spaced apart from the line axis. Activation of the rotatable output of said motor causes the frame and the object to move relative to the stationary support by retracting or extending the line from the motor.