Laminated tie plate

Abstract

A tie plate includes an outer casing having a first wall extending upward from a peripheral edge defining the hole, a rubber casing received inside the outer casing by extending into the hole of the outer casing and having a second wall extending from a peripheral edge defining the recess to be engaged with an inner face of the first wall and a mediate plate securely received inside the recess of the rubber casing and sandwiched between the rubber casing and the outer casing. Enclosure of the inner face of the first wall of the outer casing to the outer periphery of the second wall limits relative movement between the rubber casing and the outer casing.

1 . A tie plate comprising:
 an outer casing engageable with a tie and having a centrally defined hole, a first wall extending upward from a peripheral edge defining the hole;   a rubber casing received inside the outer casing by extending into the hole of the outer casing, the rubber casing having a recess in communication with the hole of the outer casing and a second wall extending from a peripheral edge defining the recess, the second wall being configured in such a manner that an outer periphery of the second wall securely engages with an inner face of the first wall; and   a mediate plate securely received inside the recess of the rubber casing and sandwiched between the rubber casing and the outer casing, the mediate plate having a top face with a first area and a bottom with a second area larger than that of the first area so that after the mediate plate is received in the recess of the rubber casing, an outer periphery of the mediate plate engages with an inner face of the second wall to secure engagement between the mediate plate and the rubber casing and enclosure of the inner face of the first wall of the outer casing to the outer periphery of the second wall limits relative movement between the rubber casing and the outer casing.   
   
   
       2 . The tie plate as claimed in  claim 1 , wherein the outer casing has through holes defined therethrough for extension of fasteners into a tie so as to secure the outer casing to the tie. 
   
   
       3 . The tie plate as claimed in  claim 2 , wherein teeth is formed on the outer casing such that after the fasteners are extended through the through holes, engagement of the fasteners with the teeth increases friction of the fasteners with the outer casing to prevent the fasteners from loosening. 
   
   
       4 . The tie plate as claimed in  claim 1 , wherein the outer casing has through holes defined therethrough for extension of fasteners into a tie so as to secure the outer casing to the tie and bosses are formed on a bottom face of the rubber casing such that friction between the rubber casing and the tie is increased. 
   
   
       5 . The tie plate as claimed in  claim 2 , wherein bosses are formed on a bottom face of the rubber casing such that friction between the rubber casing and the tie is increased. 
   
   
       6 . The tie plate as claimed in  claim 3 , wherein bosses are formed on a bottom face of the rubber casing such that friction between the rubber casing and the tie is increased. 
   
   
       7 . The tie plate as claimed in  claim 1 , wherein an inner face of the first wall is arcuate and an outer periphery of the rubber casing is arcuate such that when the rubber casing is extended into the hole of the outer casing, engagement between the outer periphery of the second wall of the rubber casing and the inner face of the first wall of the outer casing is secured. 
   
   
       8 . The tie plate as claimed in  claim 2 , wherein an inner face of the first wall is arcuate and an outer periphery of the rubber casing is arcuate such that when the rubber casing is extended into the hole of the outer casing, engagement between the outer periphery of the second wall of the rubber casing and the inner face of the first wall of the outer casing is secured. 
   
   
       9 . The tie plate as claimed in  claim 3 , wherein an inner face of the first wall is arcuate and an outer periphery of the rubber casing is arcuate such that when the rubber casing is extended into the hole of the outer casing, engagement between the outer periphery of the second wall of the rubber casing and the inner face of the first wall of the outer casing is secured. 
   
   
       10 . The tie plate as claimed in  claim 4 , wherein an inner face of the first wall is arcuate and an outer periphery of the rubber casing is arcuate such that when the rubber casing is extended into the hole of the outer casing, engagement between the outer periphery of the second wall of the rubber casing and the inner face of the first wall of the outer casing is secured. 
   
   
       11 . The tie plate as claimed in  claim 5 , wherein an inner face of the first wall is arcuate and an outer periphery of the rubber casing is arcuate such that when the rubber casing is extended into the hole of the outer casing, engagement between the outer periphery of the second wall of the rubber casing and the inner face of the first wall of the outer casing is secured. 
   
   
       12 . The tie plate as claimed in  claim 6 , wherein an inner face of the first wall is arcuate and an outer periphery of the rubber casing is arcuate such that when the rubber casing is extended into the hole of the outer casing, engagement between the outer periphery of the second wall of the rubber casing and the inner face of the first wall of the outer casing is secured. 
   
   
       13 . The tie plate as claimed in  claim 3 , wherein the mediate plate has a pair of positioning ears and a inclined face located between the two positioning ears. 
   
   
       14 . The tie plate as claimed in  claim 6 , wherein the mediate plate has a pair of positioning ears and a inclined face located between the two positioning ears. 
   
   
       15 . The tie plate as claimed in  claim 9 , wherein the mediate plate has a pair of positioning ears and a inclined face located between the two positioning ears. 
   
   
       16 . The tie plate as claimed in  claim 13 , wherein the first wall is conical and the second wall is conical. 
   
   
       17 . The tie plate as claimed in  claim 14 , wherein the first wall is conical and the second wall is conical. 
   
   
       18 . The tie plate as claimed in  claim 15 , wherein the first wall is conical and the second wall is conical. 
   
   
       19 . The tie plate as claimed in  claim 14 , wherein the first wall of the outer casing consists of a pair of mutually inclined sides and a pair of vertical sides, the pair of mutually inclined sides is tilted toward the hole of the outer casing. 
   
   
       20 . The tic plate as claimed in  claim 15 , wherein the first wall of the outer casing consists of a pair of mutually inclined sides and a pair of vertical sides, the pair of mutually inclined sides is tilted toward the hole of the outer casing.