Browse Prior Art Database

Latch Mechanism Comprising Plastic Parts

IP.com Disclosure Number: IPCOM000047076D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Nomura, H: AUTHOR

Abstract

The disclosed latch mechanism comprises two plastic parts wherein the Z-shaped part is caused to be firmly engaged or disengaged with the L-shaped part without requiring substantial force. The prior latch mechanism, as shown in Fig. 1A, is disadvantageous in that force F1 applied to part 1 and/or force F2 applied to part 2 tend to easily deform part 2, thereby causing undesirable disengagement of the latch to occur. While such shortcoming can be avoided by increasing the strength of part 2, this in turn leads to another problem that force F3, required for engagement and disengagement of the latch, will be increased accordingly. With reference to Fig. 1B, the latch is disengaged by means of bending torque T1 having arm length L, which is produced around fulcrum point B as a result of the force acting on point A.

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Latch Mechanism Comprising Plastic Parts

The disclosed latch mechanism comprises two plastic parts wherein the Z- shaped part is caused to be firmly engaged or disengaged with the L-shaped part without requiring substantial force. The prior latch mechanism, as shown in Fig. 1A, is disadvantageous in that force F1 applied to part 1 and/or force F2 applied to part 2 tend to easily deform part 2, thereby causing undesirable disengagement of the latch to occur. While such shortcoming can be avoided by increasing the strength of part 2, this in turn leads to another problem that force F3, required for engagement and disengagement of the latch, will be increased accordingly. With reference to Fig. 1B, the latch is disengaged by means of bending torque T1 having arm length L, which is produced around fulcrum point B as a result of the force acting on point A. The present latch mechanism is shown in Fig. 2A. Referring to Fig. 2B, bending torque T2 is similarly produced in this mechanism, too, due to the aforesaid action of the force. However, this mechanism is kept firmly engaged in marked contrast to the prior latch mechanism, because the direction of torque T2 is opposite to that of torque Tl by virtue of the different positional relationship between points A and B. As seen from the above, the present latch mechanism does utilize the active force per se and, hence, there is no need to greatly increase the strength of part 2. In other words, force F3, required for engag...