Two-piece crossbow bolt with tubular carbon shaft and solid carbon end element with integrated positioning notch for magazine crossbows
A crossbow bolt with a tubular carbon shaft and solid carbon end element addresses structural weaknesses by ensuring stable locking and consistent dimensions, enhancing performance under high loads.
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- TAPAN ERDAL
- Filing Date
- 2026-02-25
- Publication Date
- 2026-07-02
AI Technical Summary
Existing crossbow bolts with hybrid metal and plastic sections suffer from structural weaknesses, such as reduced diameter, material stiffness differences, and fracture issues under high loads, leading to failures at the positioning notch.
A crossbow bolt with a tubular carbon shaft and solid carbon end element, connected via a plug, features a positioning notch in the end element to ensure structural integrity and consistent diameter, eliminating geometric weaknesses and requiring no separate plastic cam element.
The solution provides a magazine-compatible bolt with stable locking and high structural integrity under high draw weights, preventing axial displacement and rotation, while maintaining consistent dimensions and load-bearing capacity.
Smart Images
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Abstract
Description
1. Technical field The invention relates to a crossbow bolt for repeating crossbows with a magazine and belongs to the technical field of projectile bodies for high-performance crossbow systems. 2. State of the art Hybrid crossbow bolts are known from the prior art, consisting of a front metal section, in particular aluminium, and a rear plastic section. The plastic section typically has a positioning notch that serves to positively lock and fix the bolt in a magazine. Disadvantages of known solutions include, in particular: • a reduction in diameter between the components, • a notch-induced weakening of the cross-section in the area of the plastic section, • different material stiffnesses in the transition area, • fracture phenomena under repeated shot loading, • plastic deformations under high tensile loads. Especially with high-performance limbs, structural failures occur in the area of the positioning notch. 3. Object of the invention The invention is based on the objective of providing a magazine-compatible crossbow bolt that • enables a positive locking positioning in the magazine, • has high structural integrity in the area of the positioning notch, • remains dimensionally stable even under high draw weights and repeated firing loads, • has no material- or geometry-related weakness in the transition area. 4. Description of the invention The problem is solved by a crossbow bolt having the features of claim 1. The crossbow bolt essentially consists of the following components: 1 - tip 2 - tubular carbon shaft 3 - solid carbon end element 4 - vanes 5 - positioning notch The tubular carbon shaft (2) has an outer diameter of 6.3 mm and is hollow inside. A solid carbon end element (3) is arranged coaxially to the carbon shaft (2). The end element (3) preferably has an outer diameter corresponding to the shaft, in particular 6.3 mm, so that a consistently uniform outer diameter is formed over the entire length of the bolt. The carbon end element (3) is connected to the tubular carbon shaft (2) via a plug connection. For this purpose, the end element (3) has a pin area that engages in the interior of the shaft (2). An overlap area exists between the pin and the shaft, which is connected, in particular, by force-fit and / or material bonding, preferably by adhesive bonding. A positioning notch (5) is incorporated into the solid carbon end element (3). The positioning notch (5) preferably has a depth of approximately 3.86 mm and a length of approximately 15 mm. Due to the massive design of the end element (3), a load-bearing residual cross-section is maintained despite the formation of the notch (5). The positioning notch (5) serves to positively lock the bolt in a magazine of a repeating crossbow and prevents axial displacement and rotation of the bolt. The massive carbon end element (3) is designed as a rear force-absorbing end piece, so that no separate plastic cam element is required. Due to the essentially consistent outer diameter, no geometric weakening area is created, unlike in known hybrid solutions. 5. Brief description of the drawings Fig. 1: Overall view of the crossbow bolt. Fig. 2: Detail view of the solid carbon end element with positioning notch. 6. List of reference symbols 1 Tip 2 Tubular carbon shaft 3 Solid carbon end element 4 Guide surfaces (vanes) 5 Positioning notch
Claims
Crossbow bolt for repeating crossbows with magazine, characterized in that the bolt is formed in two parts and has a tubular shaft (2) made of carbon fiber reinforced material and a coaxially arranged solid end element (3) made of carbon fiber reinforced material, wherein the end element (3) has a positioning notch (5) incorporated into the solid material for positive locking in the magazine and wherein the shaft (2) and end element (3) have essentially the same outer diameter. Crossbow bolt according to claim 1, characterized in that the solid end element (3) has a pin area which engages in the interior of the tubular shaft (2) and is in particular bonded to it. Crossbow bolt according to one of the preceding claims, characterized in that the positioning notch (5) has a depth of about 3.86 mm and / or a length of about 15 mm. Crossbow bolt according to one of the preceding claims, characterized in that the solid end element (3) is designed as a rear force-absorbing end piece. Crossbow bolt according to one of the preceding claims, characterized in that the outer diameter of the shaft (2) and end element (3) is approximately 6.3 mm.