Brake Pad Spreader Tool with Rotating Piston Engagement
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Solution Overview
Problem
Existing hand-held brake pad spreader tools are either expensive or inefficient, often causing uneven pressure and potential damage to the caliper piston due to resistance from dry seals, corrosion, or foreign matter, and require separate tools for different thread types.
Innovation Solution
A hand-held brake pad spreader tool with a robust design featuring a moulded or stamped frame, a pistol-type grip handle, and a drive mechanism with rotating piston engagement means that can engage both clockwise and anticlockwise threads, allowing for efficient and forceful retraction of the caliper piston with reduced wear and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded shaft pneumatic retraction mechanism is used, then the piston can be retracted, but the tool becomes expensive and slow
Solution Approach 1:
The patent replaces the complex pneumatic threaded shaft mechanism with a simple manual lever-operated mechanical system. The lever directly transmits force to the piston through a push rod, eliminating the need for threaded shafts, pneumatic components, and complex retraction mechanisms while maintaining effective piston retraction capability and significantly reducing tool complexity and cost.
Solution Approach 2:
The patent extracts and removes the unnecessary pneumatic and threaded shaft components from the system, retaining only the essential manual lever mechanism needed for piston retraction. This simplification eliminates complexity and cost while preserving the core functional capability.
2Ease of operation
If a hydraulic mechanism is used to push plates apart, then brake pads can be spread, but the plates deform and exert uneven pressure causing further resistance
Solution Approach 1:
The patent removes the hydraulic mechanism and offset plates entirely, replacing them with a direct lever-operated push rod system that applies force centrally to the piston. This eliminates the deformation and uneven pressure problems associated with the hydraulic plate system.
Solution Approach 2:
Instead of spreading brake pads indirectly through offset plates pushed by hydraulic mechanism, the patent applies force directly to the piston through the lever and push rod, inverting the approach from indirect plate-based spreading to direct piston-based spreading.
3Productivity
If a hand operated ratchet mechanism is used, then the shaft can be moved forwards, but the piston seal is destructively pinched between the caliper housing and the tool ram
Solution Approach 1:
The patent replaces the ratchet mechanism with a simple lever-operated push rod system that provides controlled, direct force application to the piston without the pinching action caused by ratchet teeth and housing interaction. The lever mechanism allows smooth shaft movement while avoiding seal damage.
4Reliability
If separate tools are used for clockwise and anti-clockwise thread types, then specific thread orientations can be accommodated, but the number of tools required increases
Solution Approach 1:
The patent designs a universal lever-operated tool that can accommodate both clockwise and anti-clockwise thread orientations through a single device. The lever mechanism and push rod configuration allow the tool to effectively retract pistons regardless of thread direction, eliminating the need for separate specialized tools while maintaining reliable thread engagement.
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 tool provides a cost-effective solution for various caliper sizes and types, offering robust and efficient operation with reduced wear on components, minimizing damage and extending the tool's lifespan while accommodating different thread orientations.
Implementation Method 1
A resilient member is provided which uncouples the drive mechanism from the shaft when the trigger is released and which repositions the trigger ready for its next operation.
Data Source
AI summary
A hand held brake pad spreader tool for use with a brake caliper (90) of the kind having a sliding caliper body supporting an opposed pair of brake pads arranged to sandwich a brake disc and a piston (92) for clamping the brake pads against the brake disc. The tool comprising a body (20); a handle (22) on the body; an abutment on the body for engaging the caliper body; an elongate member (40) supported by the body for longitudinally sliding movement relative thereto, the elongate member having a piston engagement means (50) for engaging the piston; a manually actuable moveable member (30) supported on the body adjacent to the handle; and drive means (60) coupled between the moveable member (30) for moving the elongate member (40) longitudinally from a first retracted position to a second driving position in which the piston engagement means is in driving engagement with the piston when the abutment is in engagement with the caliper body to move the piston to spread the brake pads apart. At least a portion of the elongate member in driving engagement with the piston is mounted in the body for free rotation both clockwise and anti-clockwise. The tool further comprises means for rotating the portion of the elongate member.