Door Lever Lockbox Attachment With Two-Arm Secure Fit
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Solution Overview
Problem
Conventional lockboxes designed for door knobs are not securely attachable to door levers, leading to instability and inconvenience, as the shackle either fails to tighten sufficiently or over-tightens, causing the lockbox to move with the door lever, and existing solutions like the ShurLok attachment are limited in size compatibility and security.
Innovation Solution
A two-armed apparatus with a U-shaped staple and slot mechanism that surrounds the door handle, preventing movement from a closed to an open state, allowing secure attachment of a lockbox to a door lever without the shackle encircling the handle, using adjustable components to fit various handle sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shackle of a conventional lockbox is adjusted to fit around a door lever, then the lockbox can be attached to the door, but the shackle either does not tighten enough to secure the lockbox or tightens too much causing the lockbox to move with the door lever
Solution Approach 1:
The attachment apparatus is divided into two separate arms that can independently surround the door lever. Each arm can be positioned and secured separately, allowing the lockbox to be attached without requiring the shackle to encircle the entire lever assembly. This segmentation enables secure attachment while preserving door lever functionality.
Solution Approach 2:
The attachment apparatus serves as an intermediary device between the lockbox shackle and the door lever. Instead of the shackle directly contacting and potentially interfering with the door lever, the apparatus provides a mediating structure that secures the lockbox to the lever without obstructing the lever's movement.
2Reliability
If the lockbox shackle is forced to move with the door lever depression, then the lockbox remains attached, but the lockbox is pinned against the door jamb preventing the door from opening
Solution Approach 1:
The attachment apparatus extracts the locking function from the shackle-door lever direct contact. By providing a separate attachment structure that surrounds the lever, the system removes the harmful interaction where the lockbox would be pinned against the door jamb, while maintaining secure attachment.
3Adaptability or versatility
If a plastic housing attachment is used to fit over the door knob, then the lockbox can be attached to door levers, but the apparatus can be spread open and the lockbox removed
Solution Approach 1:
The attachment apparatus utilizes a curved or rounded design that conforms to the cylindrical shape of the door lever. This curved geometry, combined with the two-arm structure, creates a secure fit that prevents the apparatus from being spread open, while still accommodating various door lever sizes through adjustable positioning.
4Adaptability or versatility
If the shackle is made adjustable in 3mm increments, then the lockbox can fit different door knob sizes, but the incremental tightening creates insecurity or over-tightening issues
Solution Approach 1:
The attachment apparatus incorporates dynamic adjustment capabilities that allow it to adapt to different door lever sizes while maintaining secure attachment. The two arms can be independently positioned to match the specific dimensions of the lever, providing a customized fit that ensures security without the rigid incremental adjustments of traditional shackles.
Data Source
AI summary
Apparatus for attaching a lockbox used for retaining a key to a door opened by the key to a door handle and especially a door lever used to open and close the door. The apparatus includes two arms each having a head portion and a bottom portion below the head portion. The arms have an open state in which the head portions are at least partly separated from one another, and a closed state in which an aperture is defined between the head portions and receives the door handle. The arms are positionable around the door handle or removable from such a position when in the open state. The arms are maintained in the closed state and movement thereof from the closed state to the open state is prevented by inserted a shackle of the lockbox through a staple engaged with both arms.