Door Handle Holder with Segmented Fixing and Pre-positioning Knobs
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Solution Overview
Problem
Existing holding devices for door or window handles, especially those made of non-metallic materials like wood or plastic, experience screw loosening due to pivoting forces, leading to instability and potential detachment.
Innovation Solution
A holding device with a lower rosette and bearing flange system that includes screw receptacles, nubs for pre-positioning and rotational fixation, and a spring-latching mechanism to enhance force distribution and secure attachment, allowing for haptic and acoustic feedback of rotational positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw connections are used to fix the lower rosette to non-metallic door leaves or window sash frames, then the handle can be mounted, but the screw connections loosen over time due to pivoting forces
Solution Approach 1:
The fixing system is divided into multiple independent elements: screw receptacles for screw fixation and separate knob elements for rotational fixation. This segmentation allows each element to address specific forces - screws handle linear attachment while knobs handle rotational stability - preventing the loosening problem by distributing the fixing function across multiple specialized components rather than relying on a single screw connection.
Solution Approach 2:
Knob elements are introduced as intermediary components between the lower rosette and the door leaf/window frame. These knobs serve as mediators that provide rotational fixation and distribute pivoting forces away from the screw connections. The knobs act as a buffer that prevents direct transmission of rotational forces to the screw threads, thereby preventing loosening while maintaining secure attachment.
2Reliability
If the lower rosette is firmly fixed to prevent loosening, then connection stability improves, but pre-positioning and alignment during installation becomes difficult
Solution Approach 1:
The knob elements are designed to protrude from the lower rosette in a way that enables pre-positioning during installation. The knobs serve as alignment guides that allow the installer to correctly position the lower rosette on the door leaf or window frame before final fixation. This preliminary positioning action is facilitated by the knobs' geometry, which provides tactile and visual cues for proper alignment without requiring complex alignment procedures.
3Ease of operation
If the bearing flange is rotatably mounted to allow handle pivoting, then handle operation is enabled, but force distribution on the lower rosette becomes concentrated
Solution Approach 1:
The force distribution function is segmented between multiple knob elements and screw receptacles. Rather than concentrating all forces on a single connection point, the system distributes rotational and pivoting forces across multiple knobs and screws. This segmentation of the force transmission path prevents stress concentration on any single element, allowing smooth handle pivoting while maintaining uniform force distribution across the mounting surface.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a holding device for a door or window handle, mountable on a receiving opening of a window sash frame, a door leaf or the like, comprising a lower rosette (2) with a contact surface (21) for bearing against a visible side (25) of a window sash frame (1), door leaf or the like, a bearing flange (3) rotatably mounted in a flange receptacle (25) perpendicular to the contact surface (21), on which the door or window handle can be fixed, wherein the lower rosette (2) has screw receptacles (24) for receiving screws (4) with which the lower rosette (2) can be fixed to the window sash frame, door leaf or the like, wherein the bearing flange (3) has a first neck part (31) for rotationally fixed attachment of the door or window handle and a second neck part (33) rotatably mounted in the flange receptacle (25),wherein knobs (22) protrude from the mounting surface (21) for pre-positioning and rotationally fixing the lower rosette (2) relative to the window sash frame, door leaf or the like.