Mechanical expansion shaft concealed expansion key return system

Abstract

A kind of mechanical expansion shaft concealed expansion key return system related to mechanical industry products, see attached drawing, it is mainly composed of 1-expansion shaft cylinder, 2-return compression spring, 3-locking screw, 4-expansion key, 6-return leaf spring, 7-pressing cover, 8-pan head screw, 5 is the expansion sleeve, this concealed expansion key return system compared with the current open installation, it not only maintains the reliable expansion and contraction function of expansion key, but also can effectively control the expansion and contraction stroke of expansion key, thereby greatly reducing the fatigue fracture of leaf spring, and even if there is fracture, expansion key will not fall off or fly out.

Description

Technical Field

[0001] This utility model relates to the improvement of mechanical expansion shafts for products in the machinery industry. Background Technology

[0002] Figure 1 This is a simplified structural diagram of the surface-mounted mechanical expansion shaft in the current expansion key return system. Figure 2 yes Figure 1 This is an enlarged view of the expansion key return system, which originates from my "High-Precision Winding Expansion Shaft" utility model patent granted in 2007. This patented product has gained market recognition and widespread application over the past decade. It mainly consists of: 1-Drive nut, 2-Pull rod, 3-Compression spring, 4-Expansion core, 5-Expansion key, 6-Expansion shaft sleeve, and 7-Return leaf spring. Its working principle is as follows: Tightening the drive nut forces the pull rod to compress the compression spring. The spring's elasticity passes through the expansion core, expansion key, and finally tightens the sleeve 8. To loosen the sleeve, simply rotate the drive nut to release the spring's elasticity. The expansion key retracts under the action of the return spring. However, since the return spring is assembled with screws on the outside of the expansion shaft sleeve to press against the bosses at both ends of the expansion key, the return system of the expansion key is exposed. This means that the maximum stroke of the expansion key can only be controlled by the external sleeve. Therefore, when a section of the expansion shaft is not fitted with a sleeve, the maximum stroke of the expansion key in that section cannot be controlled. The spring pressing against the bosses at both ends of the expansion key will fail or break due to excessive deformation, eventually causing the expansion key to fall off. If the expansion shaft is rotating at this time, the expansion key will fly out, causing a safety accident. Therefore, this must be improved. Summary of the Invention

[0003] The purpose of this utility model is to provide a mechanically expanded shaft concealed key return system, which mainly consists of an expanded shaft cylinder, an expanded key, a return pressure spring, a return leaf spring, a pressure cover, and screws. The boss at the lower part of the large end of the expanded key is located inside the expanded shaft cylinder and is pressed tightly by the return pressure spring placed in the screw hole of the expanded shaft cylinder. The pressure of the pressure spring is adjusted by the set screw on its upper part. The boss at the small end of the expanded key is pressed tightly by the screw screwed on the expanded shaft cylinder through the pressure cover and the return leaf spring.

[0004] The technical solution adopted by this utility model to solve the technical problem is: a mechanically expanded shaft concealed key return system, which mainly consists of an expanded shaft cylinder, an expanded key, a return pressure spring, a return leaf spring, a pressure cover, and screws. Its feature is that the bosses at both ends of the expanded key are concealed in the expanded shaft cylinder by screws and pressure covers through the return pressure spring and the return leaf spring. This not only effectively controls the maximum stroke of the expanded key's external expansion, thereby reducing the fatigue fracture of the leaf spring, but also ensures that even if a fracture occurs, the expanded key will not fall off or fly out.

[0005] The beneficial effects of this utility model are: the mechanically expanded key return system, which is composed of an expanded shaft cylinder, an expanded key, a return spring, a return leaf spring, a pressure cover, and screws with the above-mentioned features, not only maintains the reliable expansion and contraction function of the expanded key, but also greatly reduces the fatigue fracture of the leaf spring. Even if a fracture occurs, the expanded key will not fall off or fly out. Attached Figure Description

[0006] Appendix Figure 1 This is a simplified structural diagram of the surface-mounted mechanical expansion shaft in the current expansion key return system.

[0007] Appendix Figure 2 It is attached Figure 1 Enlarged view of point A in the middle.

[0008] Appendix Figure 3 This is a simplified structural diagram of the mechanical expansion shaft utilizing this invention.

[0009] Appendix Figure 4 It is attached Figure 3 Enlarged view of point A in the middle. Detailed Implementation

[0010] Appendix Figure 3 Appendix Figure 4 This is a preferred embodiment of the present invention. In the figure, 1-expansion shaft cylinder, 2-return spring, 3-set screw, 4-expansion key, 5-expanded sleeve, 6-return leaf spring, 7-pressure cap, 8-pan head screw. It is assembled as follows: First, insert the expansion key into the keyway of the expansion shaft cylinder, ensuring the upper part of the large end of the expansion key is tightly against one side of the keyway. Then, install the return spring and set screw into the screw hole of the expansion shaft cylinder. Next, on the expansion shaft cylinder on the small end side of the expansion key, use the pan head screw to install the return leaf spring and pressure cap. Then, adjust the pressure of the return spring using the set screw to ensure the expansion key can return smoothly. The pressure of the return leaf spring is pre-calculated based on its deformation. Thus, the concealed expansion key return system is assembled.

Claims

1. A mechanically expanded shaft concealed key return system, mainly composed of an expanded shaft cylinder, an expanded key, a return spring, a return leaf spring, a pressure cap, and screws, characterized in that... The bosses at both ends of the expansion key are concealed inside the expansion shaft cylinder by screws and pressure caps through return springs and return leaf springs. This not only effectively controls the maximum stroke of the expansion key's external expansion, thereby reducing the fatigue fracture of the leaf springs, but also ensures that the expansion key will not fall off or fly out even if a fracture occurs.

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