Wedge Screw Design for Secure Hammer Handle Attachment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for securely fastening a wooden handle to a hammer head are either complex in assembly, prone to the locking mechanism being sheared off during use, or have high screwing resistance, making them difficult to manufacture and attach efficiently and reliably.
Innovation Solution
A one-piece wedge screw with a washer head and a separate cylindrical wood screw thread area, where the cone area displaces wood material and is designed to fit snugly within the hammer eye, reducing screwing resistance and allowing easy adaptation to different hammer eye sizes, combined with a steel handle protective sleeve for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conical screw with a wood screw thread is used to fasten the wooden handle, then the screwing resistance is very high and it is very difficult to fasten in the wood handle, but using a simpler screw design would reduce fastening reliability
Solution Approach 1:
The screw is divided into two distinct functional areas: a conical wedge area for expanding the hammer eye and securing the handle, and a cylindrical wood screw thread area for easy fastening into the wooden handle. This segmentation allows each area to perform its specific function optimally without interfering with the other.
Solution Approach 2:
Different parts of the screw have different geometries and functions: the conical wedge area provides expansion force and mechanical interlocking in the hammer eye, while the cylindrical threaded area provides easy rotation and fastening in the wooden handle. This local differentiation of properties solves the contradiction between ease of fastening and reliability.
2Reliability
If a locking plate with larger cross-section than the hammer eye is used, then the hammer cannot accidentally detach from the wooden handle, but the locking plate protrudes from the contour of the hammer head and can easily be hit and sheared off when the hammer is used
Solution Approach 1:
The locking function and the fastening function are merged into a single integrated screw component. The conical wedge area provides the locking action by expanding the hammer eye, while the cylindrical threaded area provides the fastening connection to the wooden handle, eliminating the need for a separate protruding locking plate.
Solution Approach 2:
The harmful protruding locking plate is extracted and replaced by the conical wedge area that remains within the contour of the hammer head. The locking function is achieved through the conical expansion within the hammer eye rather than through a protruding external plate.
3Reliability
If a fastening device consisting of multiple parts (ring wedge, fastening plate, screw) is used, then the hammer can be securely fastened, but the device has to be arranged in the wooden handle in a complex manner in several work steps
Solution Approach 1:
Multiple separate fastening components (ring wedge, fastening plate, and screw) are merged into a single integrated wedge screw. The conical wedge area performs the function of the ring wedge, the cylindrical threaded area performs the fastening function, and the washer head provides the locking surface, all in one component that simplifies assembly to a single fastening operation.
4Reliability
If the cone area of the wedge screw is increased to improve displacement of wood material, then the screwing resistance increases, but if the cone area is decreased, then the displacement of wood material is insufficient for secure attachment
Solution Approach 1:
The screw is segmented into a conical wedge area for wood displacement and a cylindrical threaded area for easy fastening. The conical area is limited in length to provide sufficient wood displacement while the cylindrical threaded area provides low-resistance fastening, balancing the contradiction between secure attachment and ease of manufacture.
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
The solution provides a simple, cost-effective, and secure attachment of the wooden handle to the hammer head, reducing the risk of detachment and improving manufacturing efficiency, while the steel handle protective sleeve enhances protection and stability.
Implementation Method 1
a disc head as a wedge replacement has an adjoining cone area (K) that causes displacement of wood material
Implementation Method 2
a separate, cylindrical wood screw thread area (3)
Data Source
AI summary
The invention depicts and describes, among other things, a device for securely fastening a wooden handle (6) in the eye (8, 9) of a hammerhead (14) by means of a screw (2) including screw head (5) and a wood screw thread (3) as well as a means for displacing the wood material. The object of the invention is to optimize the device for securely fastening a wooden handle (6) in the eye (8, 9) of a hammerhead (14) so that it is not only simple and inexpensive to manufacture and quick to attach, but also guarantees a permanent and reliable arrangement of the hammerhead on the handle.The problem is solved by the fact that the one-piece screw (2) for fastening the wooden handle (6) has a screw head designed as a disc head (5), that the disc head has such a large diameter that it cannot pass through the hammer eye, and that the disc head, as a wedge replacement, has an adjoining conical area (K) that causes displacement of wood material and a separate, cylindrical wood screw thread area (3).