Self-Centering Tree Stand Clamp With Weight-Responsive Cable Grip
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Solution Overview
Problem
Existing tree stands and cylindrical element supports often require users to crouch or kneel to tighten clamps, and the force applied can be non-constant, potentially damaging the element due to varying diameters, and may not securely hold the element in a vertical position without additional assistance.
Innovation Solution
A self-adjusting apparatus with a base and receiving chamber that uses a retaining member and clamping mechanisms with a cable system to automatically move clamping arms into position, applying a force proportional to the element's weight, and includes a flexure spring mechanism for centering and a liquid management system for trees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pivoting clamping arms are used to engage the tree trunk, then the clamping mechanism can be prevented from disengaging, but the applied force varies with element diameter and can damage the element
Solution Approach 1:
The patent replaces the traditional pivoting clamping arm mechanism with a cable-driven system. The cable system connects the retaining member to the clamping arms, eliminating the need for pivoting arms that concentrate force at single points. This substitution distributes the clamping force more evenly across the element surface, preventing damage while maintaining reliable engagement through the cable tension mechanism.
Solution Approach 2:
The patent changes the force application parameter from concentrated point forces (pivoting arms) to distributed forces (cable system). The cable system allows the clamping force to be applied uniformly around the element, and the force magnitude is directly proportional to the element weight rather than varying with diameter, thus preventing damage to elements of different sizes.
2Reliability
If users manually tighten clamps while holding the element vertically, then the element can be secured, but the operation becomes inconvenient and may require a second user
Solution Approach 1:
The patent implements a self-service mechanism where the element's own weight activates the clamping system. When the element is placed in the apparatus, its weight causes the retaining member to displace vertically, which automatically tensions the cable system and actuates the clamping arms to engage the element. This eliminates the need for manual tightening operations and allows a single user to operate the device.
Solution Approach 2:
The patent prepares the clamping mechanism in advance by positioning the cable system and clamping arms in a ready state. The retaining member is pre-configured to convert vertical displacement into cable tension, so that when the element is simply placed into position, the clamping action occurs automatically without requiring user intervention during the securing process.
3Device complexity
If the retaining member is fixed in position, then the structure is simple, but it cannot adapt to elements of different weights and diameters
Solution Approach 1:
The patent transforms the fixed retaining member into a dynamic, vertically movable component. The retaining member is free to move vertically within the receiving chamber in response to the element's weight. This dynamic positioning allows the cable system to automatically adjust the clamping force to be proportional to the element weight, and the clamping arms adjust their position to accommodate different element diameters, providing versatility without complex adjustment mechanisms.
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
Enables secure vertical support of cylindrical elements without the need for users to bend, with a clamping force directly proportional to the element's weight, reducing damage and ensuring stability, and provides efficient liquid management for trees.
Implementation Method 1
The clamping mechanism has a cable system operatively connecting the clamping arm to the retaining member to automatically move the clamping arm from a rest position to a clamping position in response to downward vertical displacement of the retaining member
Data Source
AI summary
A self-adjusting apparatus is provided for clamping and supporting a substantially cylindrical element. When an element is placed in the self-adjusting apparatus, the element is supported at about 90° from the surface on which the apparatus sits. This is achieved with an integrated clamping mechanism and, preferably, with a self-centering mechanism comprising flexure springs and a retaining-center pin. The clamping mechanism applies a substantially radial force on the element that is directly proportional to the substantially cylindrical element's weight, and can be less than the weight of the element, preventing damage to the element. The present invention can include a liquid management system for when the apparatus supports a tree trunk. The liquid management system can include a reservoir, a funnel for filling the reservoir, a capillary wick and mat that provides water to the tree even when it is above the level of water in the reservoir.