The load-bearing strength of the handles of a cat travel trolley case must be precisely matched to the weight of the case and the cat. The key lies in combining "static load-bearing" and "dynamic load" from the very beginning of the design. This design must not only cover the combined weight of the case and the cat, but also handle the additional forces that may occur during use to ensure overall stability. First, the handle's load-bearing design must be based on the actual use scenarios of the cat travel trolley case. During daily towing, the handles not only bear the static weight of the case and the cat, but also dynamic loads from uneven surfaces and the impact of sudden starts and stops. Designing solely for static loads can easily lead to deformation or breakage of the handles over long-term use. Therefore, when determining the handle's load-bearing strength, it's important to first determine the target cat's weight range and the weight of the case itself. Furthermore, a certain safety margin should be reserved to cope with the transient pressure generated by the cat's movements within the case (such as standing, turning, or even slight jumping). This prevents dynamic loads exceeding the handle's resistance limit and compromising stability.
From the perspective of the structural design of the trolley itself, the material selection and shape directly influence its load-bearing capacity, which is also a key factor in weight matching. The trolleys of cat travel trolley cases are often made of lightweight, high-strength materials. This material ensures load-bearing capacity while preventing the trolley itself from becoming excessively heavy and burdensome. Furthermore, appropriate cross-sectional shapes (such as tubular and polygonal) can distribute stress. For example, the circular cross-section of a tubular trolley evenly distributes pressure throughout the entire rod, reducing localized stress concentrations, while a polygonal cross-section further improves bending resistance using the same material. Furthermore, the thickness of the trolley must be designed to match the weight requirements. If the cat is heavier or the case is thicker, the trolley wall thickness can be increased to ensure it resists bending under significant tension or pressure. Conversely, for lightweight trolley cases designed for smaller cats, the trolley thickness can be appropriately reduced, ensuring stability while also balancing portability.
The connection between the trolley and the case is the key node for load transmission. Its design directly determines overall stability, making it particularly crucial in the design of cat travel trolley cases. If the connection is simply snap-fit or fixed at a single point, the rod can easily loosen or even break due to concentrated force when bearing the weight of the case and the cat. Therefore, a high-quality cat travel trolley case will strengthen the connection between the rod and the case. For example, multiple screws can be used to distribute the tension across multiple connection points rather than a single location. Metal reinforcements can also be added to the connection to improve the load-bearing capacity of the local material, ensuring a stable connection between the rod and the case, preventing problems such as wobble or detachment during use.
Furthermore, the rod's locking mechanism must be compatible with the load-bearing capacity to prevent locking failure and compromised stability. The rods of cat travel trolley cases are often retractable, and the locking mechanism secures them in place when extended to the desired length. If the locking mechanism is insufficiently load-bearing, it could fail to lock under the weight of the case and the cat, causing the rod to retract unexpectedly. This not only affects the user experience but can also cause the case to tilt and startle the cat. Therefore, the locking mechanism must be designed to withstand the weight transferred by the handle. For example, using metal instead of plastic, or increasing the contact area through multiple locking positions ensures a secure lock under load and prevents shifting due to the cat's movements or vibrations during dragging.
When selecting a case, users should also conduct a physical inspection to determine whether the handle's load capacity meets their needs. For example, they can lift the handle of the cat travel trolley case to observe whether there is noticeable bending or looseness in the connections. Alternatively, they can simulate dragging to feel whether the handle is stable under the weight of the case and the cat, and whether there is any shaking or unusual noise. Also, avoid prolonged overloading. Even if the handle has safety margins, subjecting it to excessive loads will accelerate fatigue wear, reduce stability, and shorten the lifespan of the cat travel trolley case. In summary, the load-bearing strength of the cat travel trolley case's pull rod needs to be comprehensively considered through material selection, structural design, connection reinforcement and locking adaptation, and the weight of the box and the cat must be reserved. At the same time, dynamic load margin must be reserved to achieve true stability and provide safety protection for the cat's travel.
