Retractable room actuation assembly for recreational vehicle having engagement means for maintaining constant distance between drive members and engagement members
View Patent ↗A slide-out or retractable room for a mobile living quarters, such as a recreational vehicle, is provided with actuating assemblies mounted on opposite side walls of the slide-out room and the adjacent wall of the main living area. The actuating assemblies include a pair of parallel gear racks mounted on the side wall, which are engaged by pinions rotated by torque shafts mounted on the main living quarters. Each torque shaft is rotated by a separate motor. A roller engages a bearing surface on the lower portion of the gear racks. Accordingly, the slide-out room is extended and retracted by rotating the torque shafts to cause the gear racks and the attached slide-out room to extend and retract. The weight of the slide-out room is supported by the rollers, thereby supporting the slide-out room off of the floor of the main living quarters as it extends and retracts. A synchronizing control operates the motors.
1. An actuating mechanism for mobile living quarters having a side wall and a slide-out room movable relative to the side wall between a retracted position and an extended position extended from the side wall, said actuating mechanism moving said slide-out room between the extended and retracted positions, said actuating mechanism comprising:
a first pair of engagement members mounted on said slide-out room and moving with said slide-out room, each said engagement member having a plurality of slots;
a pair of drive members, each drive member having engagement features meshing with a corresponding engagement member, said drive members being driven together to move said slide-out room between its retracted and extended positions; and
an engagement means for restraining movement of said drive members away from said engagement members.
2. An actuating mechanism as claimed in claim 1 , wherein said engagement means includes a roller projecting from a bearing block, said roller being held at a fixed predetermined distance from one said drive member, said roller having rolling engagement with a complementary bearing surface carried on said slide-out room, said engagement of said roller and said bearing surface on said slide-out room preventing movement of said drive members away from said engagement member.
3. An actuating mechanism as claimed in claim 1 , wherein said engagement means includes a pair of rollers each projecting from a bearing block and each being held at a predetermined distance from a corresponding drive member, each said roller being in rolling engagement with a corresponding complementary bearing surface mounted on said slide-out room so that said roller is restrained from lateral movement relative to said complementary bearing surface, said rollers restraining lateral movement of said drive members away from their corresponding engagement members.
4. An actuating mechanism as claimed in claim 2 , wherein said complementary bearing surfaces carried on said slide-out room are included on said engagement members.
5. An actuation mechanism as claimed in claim 4 , including means for ensuring said engagement members are substantially parallel.
6. An actuation mechanism as claimed in claim 4 , wherein said rollers support the weight of said slide-out room.
7. An actuation mechanism as claimed in claim 1 , wherein said drive members comprise pinions rotating together and fixed from rotation relative to each other on a common shaft.
8. An actuation mechanism as claimed in claim 7 , wherein said engagement members are racks having a plurality of slots for meshing with said pinions.
9. An actuating mechanism as claimed in claim 8 , wherein said engagement means includes an upper engagement member for ensuring said rollers remain in contact with said bearing surfaces.
10. An actuating mechanism as claimed in claim 8 , wherein said engagement means includes a pair of rollers each being held at a predetermined distance from a corresponding pinion, each said roller being in rolling engagement with a corresponding complementary bearing surface mounted on said slide-out room so that said roller is restrained from lateral movement relative to said complementary bearing surface, said rollers restraining lateral movement of said drive members away from their corresponding engagement members.
11. An actuating mechanism as claimed in claim 10 , wherein said complementary bearing surfaces mounted on said slide-out room are included on said racks.
12. An actuation mechanism as claimed in claim 11 , wherein said rollers support the weight of said slide-out room.
13. An actuation mechanism as claimed in claim 12 , wherein said pinions, common shaft, and said rollers are laterally movable together and restrained from longitudinal movement within an elongate column.
14. An actuation mechanism as claimed in claim 13 , wherein said elongate column includes a mounting flange for mounting to the sidewall of a vehicle.
15. An actuation mechanism as claimed in claim 7 , wherein the weight of said room is supported on rollers.
16. An actuation mechanism as claimed in claim 11 , including means for assuring said engagement members are substantially parallel.
17. An actuation mechanism as claimed in claim 11 , wherein said engagement members are racks, said drive members are pinions rotating together and fixed from rotation relative to each other on a common shaft, said pinions being slidable on said shaft to maintain engagement with their corresponding racks as said pinions follow an inclined section of said rack.
18. An actuation mechanism as claimed in claim 1 , wherein said engagement means includes a hooked extension extending from each said bearing block into a groove in each of said engagement members.
19. An actuation mechanism as claimed in claim 18 , wherein said hooked extension is covered by a low friction, plastic shoe.