Cab Door Wire Harness Layout for Safe Release Lever Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing construction machines face issues with degraded operability and increased risk of contact with wire harnesses due to their exposure when the door is opened 180°, as the open state holding locking release lever is often operated while avoiding the hanging wire harness, leading to potential disconnection or accidental grabbing.
Innovation Solution
The construction machine design includes first and second insertion holes for the wire harness positioned further upward than the open state holding locking release lever, with a wire route through first and second rooms, and additional arrangement spaces to accommodate excess length, reducing exposure and facilitating safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wire harness is arranged from the side of the main body of the cab via insertion holes in the cab and door, then power can be supplied to electrical equipment mounted on the door, but the wire harness is exposed to the outside between the insertion holes when the door is opened 180°, creating a risk of contact with the operator
Solution Approach 1:
The wire harness routing is changed from a horizontal path through side insertion holes to a vertical path through upper insertion holes. By moving the insertion holes to the upper portion of the door and cab, the wire harness passes through a different spatial dimension (upper region) that is separated from the operator's hand operation zone (lower region), thus eliminating contact risk while maintaining electrical connectivity
Solution Approach 2:
The upper insertion holes act as intermediaries that redirect the wire harness away from the dangerous zone. Instead of the wire harness directly exposing in the operator's vicinity, the upper insertion holes serve as intermediate access points that route the wire through a safe upper path, mediating between the power supply need and the safety requirement
2Ease of operation
If the open state holding locking release lever is positioned for easy operation, then operator convenience is improved, but the lever may be operated while avoiding the exposed wire harness, increasing the risk of accidental contact or disconnection
Solution Approach 1:
By relocating the wire harness routing to the upper dimension (through upper insertion holes), the harmful factor (exposed wire) is separated from the operator's operational dimension (lower hand operation zone). This spatial separation in different dimensions allows the release lever to be positioned for optimal operability without creating contact risk
Solution Approach 2:
The wire harness is extracted from the lower region near the release lever and relocated to the upper region. By taking out the wire harness from the operational zone and placing it in the upper insertion holes, the harmful factor is removed from the area where the operator's hand operates the release lever, eliminating the contact risk
Data Source
AI summary
A construction machine 1 includes: a cab 6 that includes a first frame body 15 forming an opening portion 16; a door 17 that includes a second frame body 18 attached to the first frame body 15 via hinges 19; an open state holding locking mechanism 22 that holds the door 17 in an open state; and an open state holding locking release lever 28 that releases the open state holding of the door 17 achieved by the open state holding locking mechanism 22, the first frame body 15 including a first insertion hole formed in a first side end wall 15a to which the hinges 19 are attached and a first room 31, a second frame body 18 including a second insertion hole 32 formed in a second side end wall 18a to which the hinges 19 are attached and a second room 33, the wire harness 34 being arranged from the first room 31 to the second room 33 via the first insertion hole 30 and the second insertion hole 32, the first insertion hole 30 and the second insertion hole 32 being provided on a side further upward than the open state holding locking release lever 28.