Cremone Bolt Handle With Toothed Coupling For Frame Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The mounting of cremone bolt handles on window or door frames is complex, requires skilled operators, and results in unstable anchoring due to the need for additional slots and holes for clamping mechanisms, making the process laborious and prone to errors.
Innovation Solution
A cremone bolt handle design featuring clamping brackets with a sliding and oscillating mechanism that allows for easy alignment and secure attachment without additional slots or holes, and a toothed coupling for millimetric adjustment of the 'fins' or 'strips' to match the frame depth, simplifying and stabilizing the mounting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-threading screws or counter-plates are used for mounting, then the handle can be fixed to the frame, but additional slots and holes are required which complicate the mounting process and require skilled operators
Solution Approach 1:
The mounting system is divided into modular components: the handle body with integrated mounting ears, separate fixing screws, and distinct slot openings. This segmentation allows each component to be optimized independently while simplifying the overall assembly process, as the mounting ears provide pre-positioned attachment points that eliminate the need for complex pre-drilling and alignment operations.
Solution Approach 2:
The mounting ears are pre-formed as integral parts of the handle body during manufacturing. This preliminary action ensures that the mounting interfaces are already prepared with correct positioning and geometry, eliminating the need for on-site fabrication of mounting features and reducing the skill level required for installation.
2Reliability
If clamping brackets with cylindrical bells are used, then the handle can be clamped to the section, but the mounting becomes particularly complex and laborious requiring insertion and centering operations
Solution Approach 1:
The complex cylindrical bell centering mechanism is extracted and replaced with simple mounting ears that have built-in alignment features. The problematic centering operation is eliminated by designing the mounting ears to naturally align with the slot openings through geometric constraints, removing the need for specialized insertion tools and centering procedures.
Solution Approach 2:
Instead of inserting cylindrical bells into holes and then centering them, the design inverts the approach by having the mounting ears protrude outward from the handle body, with their positions and orientations predetermined by the handle's geometry. This allows direct attachment to the frame without reverse assembly operations.
3Ease of operation
If multiple slots and holes are made in the section, then the handle can be mounted, but the structural integrity and stability of the section are compromised
Solution Approach 1:
The mounting ears are designed with localized reinforcement at the attachment points, concentrating the structural strength exactly where the fixing screws apply loads. This local quality enhancement ensures that the mounting openings do not compromise the overall structural integrity of the handle body, as the stress is distributed through strategically placed reinforcement zones rather than requiring extensive material removal from the main structure.
Data Source
Figure 1
Figure 1A
Figure 1B~1C
AI summary
A handle (10), in particular of the cremone bolt type, applicable onto the frame (100) of a moveable wing of a window or door and comprising a box-shaped body (11) that has a face (12) for resting on the frame (100) and a face (13) opposite to the resting face (12) and from which a manoeuvring handgrip (14) projects, said handgrip (14) being fixed to a rotor (15) that is housed in the box-shaped body (11) in a rotatable manner about a rotation axis (R) orthogonal to the resting face (12), wherein the rotor (15) is associable to a mechanism (18) for transforming the rotary motion of the rotor (15) into a translation motion of at least one slider (19) which can be coupled to a respective rod (106) for manoeuvring or closing the moveable wing, wherein the handle (10) is characterised in that the at least one slider (19) is provided with a tab (24) that projects from the resting face (12) and that extends in the direction substantially parallel to the rotation axis (R) to be inserted into a slot (104) obtained in the frame (100) and onto which tab a respective attachment plate (25) is mounted, onto which the end of a respective manoeuvre or closing rod can be fixed, wherein the attachment plate (25) is guided on the tab (24) slidably along a direction parallel to the rotation axis (R) and wherein between the attachment plate (25) and the tab (24), a toothed coupling is defined that extends along the relative sliding direction between the attachment plate (25) and the tab (24) and whose mutually meshed teeth develop in the direction transverse to the sliding direction to allow a "stepped" adjustment of the position of the attachment plate (25) with respect to the tab (24).