Adapter for extending open-end / ring wrenches
The adapter for extending wrenches addresses limitations by enabling 15-degree angular adjustment and secure attachment, doubling torque and reducing effort, facilitating efficient and safe tightening and loosening in confined spaces with multiple wrench sizes.
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-11-13
- Publication Date
- 2026-03-26
AI Technical Summary
Existing wrench extensions are limited in their ability to extend in multiple directions, attach at angles beyond 30 degrees, fit various wrench sizes, and ensure safe, high-torque applications, posing safety risks and inefficiencies.
An adapter that allows for a 15-degree angular adjustment between connected wrenches, secure attachment, and compatibility with all wrench sizes, made of high-strength aluminum, featuring rubber stoppers for stability and a design that minimizes slippage, doubling torque and reducing effort.
Enables efficient, safe, and ergonomic tightening and loosening of screws in hard-to-reach places with reduced effort, ensuring stable leverage and preventing tool wear, while allowing use with different wrench sizes.
Smart Images
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Abstract
Description
1. Technical field:
[0001] The adapter for extending open-end / ring wrenches makes it possible to connect two wrenches in order to loosen or tighten stuck screws with less effort, even in hard-to-reach places. 2. State of the art:
[0002] Existing extensions are devices that can only extend the wrench in one direction or only slightly. Furthermore, the extension can only be attached at a maximum angle of 30 degrees.
[0003] Furthermore, common extensions are attached to the outside of the key, widening it. This limits the possibility of working in narrow corridors in a space-saving manner.
[0004] Furthermore, existing extensions are not suitable for all wrench sizes. Devices that use a ratchet mechanism are not suitable for high torque applications.
[0005] Improvised extensions, e.g., loose pipes or welded connections, are dangerous and pose a risk of injury due to uncontrolled slippage or kickback. 3. Thoughts on the invention:
[0006] An adapter should be developed that approximately doubles the lever arm, thereby doubling the torque and halving the effort required. Furthermore, it should be possible to attach an extension wrench with a different wrench size, so that a second set of wrenches is not needed.
[0007] When loosening or tightening screws or nuts, the angle at which the wrench is applied is extremely important. The angle of an open-end / ring wrench applied to the screw head or nut is normally 30 degrees. The invention aims to allow the extension wrench to be applied at an angle of 15 degrees, thus making it easier to work in narrow passageways or hard-to-reach places. 4. Solution to the task:
[0008] The adapter for extending open-end / ring spanners allows the extension wrench to be positioned at 15-degree intervals. The different wrench sizes on the adapter are rotated by 7.5 degrees, so that a 180-degree rotation of the adapter allows the second wrench to be positioned at 15-degree intervals.
[0009] The secure connection of the wrenches ensures reliable power transmission, especially on tight connections. The adapter is designed to minimize slippage of the wrenches. The improved leverage and body position provide greater control and thus also minimize the risk of rounding off screw edges.
[0010] Furthermore, the adapter can be manufactured to extend open-end / ring wrenches for all wrench sizes. Description and application:
[0011] The adapter for extending open-end / ring wrenches is made of high-strength aluminum (7075) with a tensile strength of 570 MPa (N / mm²). 2 For comparison: S235JR has a tensile strength of 360 - 510 MPa
[0012] Two differently sized hexagons, rotated by 7.5 degrees, are embedded in a round piece of aluminum. No notch effect due to radii at all corners. Figure 1:
[0013] The adapter is only suitable for open-end wrenches. To prevent the wrench from slipping, it is laterally limited by an outer ridge and secured by rubber stoppers embedded in the metal at each wrench size. (see diagram) Application for use in cases of difficult-to-loosen screw connections or forceful tightening of screws / nuts:
[0014] The open-end / ring wrench is applied to the screw head or nut using the ring wrench (for better force transmission). The adapter ( Fig. 1) is inserted into the opening of the open-end wrench and can be extended with the jaw of another (not the same size) wrench (approx. double the length). Figure 2:
[0015] The adapter is a further development of the Fig. 1.
[0016] The adapter's application possibilities ( Fig. 2) are identical to those of the adapter ( Fig.1) By omitting the outer limiting ribs, it is possible to attach a ring wrench. It is secured by spring-loaded pressure pieces. (see sketch)
[0017] The adapter can be securely attached to the ring wrenches, allowing screws with locknuts or pipe connections to be loosened or tightened with the open-end wrench. 5. Advantages of the invention: - Low weight - Easy to use - Halves the effort required, through better leverage - No lateral setup required - enables work in narrow corridors - No notch effect due to radii in all corners - The tight connection of the wrenches reduces lateral tilting and slipping. - Increased workplace safety: More ergonomic working conditions, more stable posture, reduced risk of injury - Creates opportunities to position the wrench at smaller angles and to work in hard-to-reach places or overhead. - Minimizes the risk of rounding off screw edges - Less tool wear or damage to the jaw or handle - Can be used with a wrench of a different size (only one set of wrenches is required) - Can be manufactured for all common wrench sizes (metric / inch) or according to individual requirements 6. Example of implementation:
[0018] In a car repair shop, a stuck screw with a wrench size of 19 mm has to be loosened on a vehicle which is on a lifting platform, overhead, in a narrow corridor, in a hard-to-reach place.
[0019] To loosen the screw, place the 19mm wrench with the ring end against the screw, hold the wrench firmly with one hand and insert the adapter with the wrench size 19 into the jaw opening of the 19mm wrench.
[0020] The rubber stoppers hold the adapter in the intended position, preventing it from falling out and thus facilitating overhead work. An additional open-end wrench (18 mm) is inserted into the adapter, effectively extending it by approximately 100%. This allows the screw to be loosened with half the effort, without the need for additional personnel or equipment. If the angle of the wrench being used is not optimal, it can be adjusted by 15 degrees by rotating the adapter 180 degrees. 7. Summary:
[0021] The adapter for extending open-end / ring wrenches offers the possibility to loosen or tighten screws or nuts easily and with little effort in hard-to-reach places by connecting two wrenches of different sizes at an angle of 15 degrees.
Claims
[1] Adapter for extending open-end / ring wrenches, characterized by , that on a round piece of aluminium with two inserted hexagons, in different wrench sizes, which are rotated by 7.5 degrees, it is possible to apply the wrenches at an angle of 15 degrees. [2] Adapters for extending open-end / ring wrenches, characterized by that a fixed connection between two wrenches of different sizes is possible. [3] Adapters for extending open-end / ring wrenches, characterized by , that the integrated rubber stoppers and spring-loaded pressure pieces prevent slippage and ensure a firm connection. [4] Adapters for extending open-end / ring wrenches, characterized by that radii in all corners prevent a notch effect.