Lock

Abstract

A lock includes a latch drive tube, an outer rotating shaft tube, a coupling, an outer drive shaft sleeve, an outer transmission shaft sleeve, a safety bar, and an outer handle, arranged along an axis. The outer rotating shaft tube is detachably connected to the latch drive tube via the coupling. The outer drive shaft sleeve and the outer transmission shaft sleeve are nested within the outer rotating shaft tube and are interconnected via a helical guide groove-guide post structure. The safety bar passes through the latch drive tube, abuts against the coupling, and is connected to the outer drive shaft sleeve. The outer handle covers the outer rotating shaft tube and the outer drive shaft sleeve but has an operating channel, allowing an external hand tool to be inserted into the operating channel to push the outer drive shaft sleeve along the axis, thereby driving the safety bar from a locked state to an unlocked state via the outer drive shaft sleeve.

Claims

1. A lock, comprising: a latch drive tube rotatably disposed about an axis; an outer rotating shaft tube rotatably disposed about the axis; a coupling member movably disposed on the outer rotating shaft tube along the axis, the outer rotating shaft tube being connected to the latch drive tube via the coupling member; an outer transmission shaft sleeve rotatably disposed within the outer rotating shaft tube about the axis; and an outer drive shaft sleeve movably disposed within the outer rotating shaft tube along the axis, the outer drive shaft sleeve and the outer transmission shaft sleeve being stacked on top of each other and connected via at least one helical guide groove and a guide post slidably disposed within the at least one helical guide groove; A safety bar, rotatably mounted about an axis and passing through the latch drive tube along the axis, the safety bar abutting against the coupling and connected to the outer drive shaft sleeve; and an outer handle, fitted onto the outer rotating shaft tube to allow the outer handle and the outer rotating shaft tube to rotate together about the axis, the outer handle covering the outer drive shaft sleeve but having an operating channel through which the axis passes; wherein... An external hand tool is inserted into the operating channel to push the outer drive shaft cylinder along the axis, causing the outer drive shaft cylinder to rotate about the axis and drive the safety bar from a locked state to an unlocked state; wherein, when the safety bar is in the locked state, the engagement member is separated from the latch drive tube, and when the safety bar is in the unlocked state, the engagement member is engaged with the latch drive tube.

2. The lock as claimed in claim 1 further includes an outer fixing seat, wherein the outer rotating shaft tube is rotatably disposed on the outer fixing seat about the axis, the outer fixing seat having a limiting groove, wherein when the safety bar is in the locked state, the engaging member is engaged in the limiting groove.

3. The lock as claimed in claim 1, wherein the latch drive tube includes a joint and a tube extending from the joint along the axis, the joint being rotatably disposed within the outer rotating shaft tube about the axis, and when the safety bar is in the unlocked state, the latch drive tube engages with the joint via the joint.

4. The lock as claimed in claim 1, wherein the at least one spiral guide groove is disposed on the outer drive shaft cylinder, and the guide post is disposed on the outer transmission shaft cylinder.

5. The lock as claimed in claim 4, wherein the at least one spiral guide groove comprises two spiral guide grooves formed opposite to each other on the outer drive shaft cylinder, and the two ends of the guide post slide in the two spiral guide grooves.

6. The lock as claimed in claim 1, wherein the outer drive shaft cylinder has a drive hole with two push-off portions disposed opposite to each other, the safety bar extends into the drive hole, and the outer drive shaft cylinder rotates the safety bar by the two push-off portions.

7. The lock as claimed in claim 6 further includes a spring, wherein the spring is compressed and disposed between the outer drive shaft cylinder and the outer transmission shaft cylinder along the axis.

8. The lock as claimed in claim 1, wherein the coupling has a first positioning groove and a second positioning groove arranged about the axis, and the safety bar has a push portion that engages with the first positioning groove when the safety bar is in the locked state and with the second positioning groove when the safety bar is in the unlocked state.

9. The lock as claimed in claim 8 further includes a spring configured to push against the engagement member to keep the safety bar against the engagement member.

10. The lock as claimed in claim 1, wherein the outer handle comprises a handle body and a cover, the handle body being fitted onto the outer rotating shaft tube and having an opening, the cover being located at the opening and connected to one end of the outer rotating shaft tube, and the operating channel being formed in the cover.

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