Latch assembly

Abstract

This invention relates to a latch assembly, including a latch module and a drive module. The latch module includes a latch cylinder, a latch head, a connecting plate, and a linkage plate. The latch head is movably disposed on the latch cylinder along the axial direction of the latch cylinder. The connecting plate is connected to the latch head, and the linkage plate is engaged with the connecting plate and abuts against the latch cylinder. The drive module is connected to the latch module and includes a drive plate and a drive member. The drive plate abuts against the linkage plate, and the drive member has a drive shaft hole for fitting to a drive shaft. Furthermore, the cross-sectional shape of the inner wall of the latch cylinder corresponds to the outer edge contour of the linkage plate and is elliptical, to prevent the linkage plate from spinning freely within the latch cylinder during operation.

Claims

1. A latch assembly, comprising: A latch module includes: a latch cylinder; a latch head movably disposed on the latch cylinder along the axial direction of the latch cylinder; a connecting plate connected to the latch head; and a linkage piece engaged with the connecting plate, wherein one end of the linkage piece abuts against the latch cylinder; and a drive module connected to the latch module and including: a drive plate abutting against the linkage piece; and a drive member having a drive shaft hole for fitting to a drive shaft; wherein, when the drive shaft drives the drive member to rotate, the drive plate is moved to drive the linkage piece to sway, so that the linkage piece moves the latch head relative to the latch cylinder from an extended position to a retracted position via the connecting plate; wherein, the inner wall cross-sectional shape of the latch cylinder corresponds to the outer edge contour of the linkage piece and is elliptical, so as to prevent the linkage piece from spinning freely within the latch cylinder during operation; The ellipse has a major axis and a minor axis, and the ratio of the major axis to the minor axis is between 1.05 and 1.

5.

2. The latch assembly as claimed in claim 1, wherein the linkage piece is provided with a groove, the latch cylinder is provided with a positioning pin, and the positioning pin corresponds to the groove.

3. The latch assembly as claimed in claim 2, wherein the locating pin is disposed within the groove.

4. The latch assembly as claimed in claim 1, wherein the latch module includes a cover plate having a guide hole whose shape corresponds to the shape of the latch cylinder.

5. The latch assembly as claimed in claim 1, wherein the drive module includes a housing connected to the latch cylinder and for housing the drive plate and the drive member.

6. The latch assembly as claimed in claim 5, wherein the housing has a first cover plate and a second cover plate opposite to the first cover plate, the first cover plate being provided with a first opening formed by a first hole portion, a second hole portion and an intermediate portion, and the intermediate portion being disposed between the first hole portion and the second hole portion.

7. The latch assembly as claimed in claim 6, wherein the inner diameter of the first hole is equal to the inner diameter of the second hole, and the width of the intermediate portion is different from the inner diameter of the first hole.

8. The latch assembly as claimed in claim 6, wherein one end of the first cover plate is formed with an extension structure that is bent at a predetermined angle relative to the body of the first cover plate, and the predetermined angle is between 2 degrees and 5 degrees.

9. The latch assembly as claimed in claim 1, wherein the connecting plate has a first side and a second side opposite the first side, the first side having a recessed structure and the second side having a protruding structure.

10. The latch assembly as claimed in claim 1, wherein the latch cylinder has a recessed structure and the end of the linkage abuts against the recessed structure of the latch cylinder.

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