Transmission device for a door lock
A transmission device for a door lock has a solenoid switch, a driven device and a linkage assembly. The solenoid switch has a solenoid core, a guide tube, a sleeve and a clutch cap. The guide tube is mounted in the solenoid core and has a connecting end. The connecting end is formed on one end of the guide tube and protrudes out of the solenoid core. The sleeve is mounted slidably in the solenoid core and around the guide tube and has at least one engaging tab formed on and protruding from the sleeve at one end adjacent to the connecting end of the guide tube. The clutch cap is mounted around the connecting end of the guide tube and has at least one engaging notch selectively and detachably engaging respectively with a corresponding engaging tab on the sleeve.
1. A solenoid switch for a door lock comprising:
a solenoid core having
a receiving hole being defined in the solenoid core; and
a solenoid coil being wound around the solenoid core;
a guide tube being mounted in the receiving hole in the solenoid core and having
an axial hole being defined through the guide tube; and
a connecting end being formed on one end of the guide tube and protruding out of the receiving hole in the solenoid core;
a sleeve being mounted slidably in the receiving hole in the solenoid core and around the guide tube and having a protruding end and at least one engaging tab formed on and protruding from the protruding end of the sleeve and disposed adjacent to the connecting end of the guide tube; and
a clutch cap being mounted around the connecting end of the guide tube and having at least one engaging notch selectively and detachably engaging respectively a corresponding engaging tab on the sleeve.
2. The solenoid switch as claimed in claim 1 , wherein the guide tube further has
an engaging end opposite to the connecting end;
an annular fastening groove defined around the engaging end; and
a fastener being mounted in the fastening groove in the engaging end and abutting the solenoid core to hold the guide tube securely on the solenoid core.
3. The solenoid switch as claimed in claim 1 , wherein the guide tube further has an annular flange formed around the connecting end and abutting the clutch cap to hold the clutch cap at position on the connecting end of the guide tube.
4. The solenoid switch as claimed in claim 3 , wherein the guide tube further has an engaging end opposite to the connecting end and at least one guiding channel being formed longitudinally in the engaging end; and
the sleeve further has at least one guiding protrusion formed on an inner surface of the sleeve at an end opposite to the at least one engaging tab and being mounted slidably in a corresponding guiding channel in the guide tube.
5. The solenoid switch as claimed in claim 1 further comprising a resilient element mounted around the guide tube and pressing the sleeve away from the clutch cap.
6. The solenoid switch as claimed in claim 1 , wherein the sleeve has two engaging tabs formed respectively on the protruding end of the sleeve.
7. The solenoid switch as claimed in claim 6 , wherein the clutch cap has two engaging notches engaging respectively with the engaging tabs on the sleeve; and
each engaging notch has a width larger than that of a corresponding engaging tab on the sleeve.
8. The solenoid switch as claimed in claim 1 , wherein the guide tube further has a cavity being defined in the connecting end of the guide tube, communicating with the axial hole and being larger than the axial hole.
9. The solenoid switch as claimed in claim 1 , wherein the axial hole has a non-circular cross section.
10. A transmission device for an electrical lock comprising:
a solenoid switch comprising
a solenoid core having
a receiving hole being defined in the solenoid core; and
a solenoid coil being wound around the solenoid core;
a guide tube being mounted in the receiving hole in the solenoid core and having
an axial hole being defined through the guide tube; and
a connecting end being formed on one end of the guide tube and extending out of the receiving hole in the solenoid core;
a sleeve being mounted slidably in the receiving hole in the solenoid core and around the guide tube and having a protruding end and at least one engaging tab formed on and protruding from the protruding end of the sleeve and disposed adjacent to the connecting end of the guide tube; and
a clutch cap being mounted around the connecting end of the guide tube and having at least one engaging notch selectively and detachably engaging respectively a corresponding engaging tab on the sleeve;
a driven device being securely connected to the clutch cap of the solenoid switch; and
a linkage assembly being slidably mounted around the solenoid switch and comprising
an outer linkage being connected to the clutch cap of the solenoid switch;
an inner linkage connected to the outer linkage and the driven device; and
at least one spring connected between the inner linkage and the driven device.
11. The transmission device as claimed in claim 10 , wherein the guide tube further has
an engaging end opposite to the connecting end;
an annular fastening groove defined around the engaging end; and
a fastening element mounted in the fastening groove in the engaging end and abutting the solenoid core to hold the guide tube securely on the solenoid core.
12. The transmission device as claimed in claim 10 , wherein the guide tube further has an annular flange formed around the connecting end and abutting the clutch cap to hold the clutch cap at position on the connecting end of the guide tube.
13. The transmission device as claimed in claim 12 , wherein the guide tube further has an engaging end opposite to the connecting end and at least one guiding channel longitudinally defined in the engaging end; and
the sleeve further has at least one guiding protrusion formed on an inner surface of the sleeve at an end opposite to the at least one engaging tab and slidably held respectively in the at least one guiding channel in the guide tube.
14. The transmission device as claimed in claim 10 further comprising a resilient element mounted around the guide tube and having two ends abutting respectively the sleeve and the clutch cap.
15. The transmission device as claimed in claim 10 , wherein the sleeve has two engaging tabs formed respectively on two ends of a diameter of the sleeve.
16. The solenoid switch as claimed in claim 15 , wherein the clutch cap has two engaging notches engaging respectively with the engaging tabs on the sleeve; and
each engaging notch has a width larger than that of a corresponding engaging tab on the sleeve.
17. The transmission device as claimed in claim 10 , wherein the guide tube further has a cavity having a diameter larger than that of the axial hole, defined in the connecting end of the guide tube and communicating with the axial hole.
18. The transmission device as claimed in claim 10 , wherein the linkage assembly further has a single U-shape spring comprising
a middle connected to the inner linkage;
two resilient segments formed respectively on two ends of the middle; and
two connecting ends formed respectively on the resilient segments and connected respectively to the driven device.
19. The solenoid switch as claimed in claim 10 , wherein the axial hole has a non-circular cross section.
20. A door lock comprising
a handle assembly being an inner and outer handle retracting a latch assembly;
a solenoid switch selectively engaging the latch assembly, wherein the solenoid switch comprises
a solenoid core having
a receiving hole being defined in the solenoid core; and
a solenoid coil being wound around the solenoid core;
a guide tube being mounted in the receiving hole in the solenoid core and having
an axial hole being defined through the guide tube; and
a connecting end being formed on one end of the guide tube and protruding out of the receiving hole in the solenoid core;
a sleeve being mounted slidably in the receiving hole in the solenoid core and around the guide tube and having a protruding end and at least one engaging tab formed on and protruding from the protruding end of the sleeve and disposed adjacent to the connecting end of the guide tube; and
a clutch cap being mounted around the connecting end of the guide tube and having at least one engaging notch selectively and detachably engaging respectively a corresponding engaging tab on the sleeve.