Anti-spin/anti-drift worm gear brake with bevel gear speed-up

Abstract

An anti-spin, anti-drift assembly for installation on a railroad car plug-type door locking mechanism of the type having a gear segment rotatably mounted on the door, rotatable pipes mounted on the plug-type door, rods pivotally connected to the gear segment and to the rotatable pipes so that rotation of the gear segment brings about rotation of the pipes and opening and closing of the plug-type door. The anti-spin, anti-drift assembly includes a worm gear meshing with the gear segment. A speed up gear is located at one end of the worm gear. A drive gear meshes with the speed up gear and an operating wheel rotates the drive gear.

1 . An anti-spin, anti-drift assembly for installation on a railroad car plug-type door locking mechanism of the type having a gear segment rotatably mounted on said plug-type door, rotatable pipes mounted on said plug-type door, rods pivotally connected to said gear segment and said rotatable pipes so that rotation of said gear segment brings about rotation of said pipes and opening and closing of said plug-type door, the improvement comprising: 
 a worm gear meshing with said gear segment,    a speed up gear at one end of said worm gear,    a drive gear meshing with said speed up gear, and    an operating member to rotate said drive gear.    
   
   
       2 . The anti-spin, anti-drift assembly of  claim 1  in which said drive gear and said speed up gear form a bevel gear set.  
   
   
       3 . The anti-spin, anti-drift assembly of  claim 1  in which said worm gear is a single lead thread.  
   
   
       4 . An anti-spin, anti-drift mechanism for a rotatable gear segment, said mechanism including: 
 a worm gear meshing with said rotatable gear segment,    an operating member rotatably mounted relative to said rotatable gear segment, and    a bevel gear set operatively connecting said operating member and said worm gear.    
   
   
       5 . The anti-spin, anti-drift mechanism of  claim 4  in which said bevel gear set includes a speed-up gear at one end of said worm gear and a drive gear connected to said operating member.  
   
   
       6 . The anti-spin, anti-drift mechanism of  claim 5  in which said speed-up gear is a bevel gear.  
   
   
       7 . The anti-spin, anti-drift mechanism of  claim 6  in which said bevel gear is formed integrally with said worm gear.  
   
   
       8 . The anti-spin, anti-drift assembly of  claim 3  in which said worm gear is formed with a lead angle of said single lead thread having a tangent which is greater than the coefficient of friction of the engaging surfaces of said gear segment and said worm gear.  
   
   
       9 . The anti-spin, anti-drift assembly of  claim 4  in which said worm gear is formed with a thread lead angle having a tangent which is greater than the coefficient of friction of the engaging surfaces of said gear segment and said worm gear.