Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
  • E01B7/00—Switches; Crossings
  • E01B7/10—Frogs
  • E01B7/12—Fixed frogs made of one part or composite

Definitions

• the technical solution relates to construction of a frog with trimmed casting of a mono- block used with railway switches.
• An example of all-cast frogs are the frogs according to the CZ patent file No. 282131, the disadvantages of which include their demanding manufacture, demanding forming and complicated cleaning after casting, large consumption of steel for manufacture, heavy weight, increased costs on significant range of their machining so as to reach required geometric shape, increased possibility of faults occurrence during machining. That is also connected with large power demands regarding their manufacture, which is set by dimensions of the frog cast, significant extent of machining and increased demands towards faults repairs.
• the disadvantage of frogs with trimmed mono-block according to CZ utility model No. 5698 is the construction organization of the terminal part, which does not correspond with requirements towards arrangement of necessary rigidity as needed for transfer of dynamic powers developed during ride of wheel vehicles, which would prevent excessive loads in shaped spots of the cross-section.
• Insert frogs are the frogs according to CN patent file No. 102021867.
• the disadvantages of the frog with forged hardened tip and wing rails include lower rigidity and shorter service life.
• the construction solution does not offer necessary compactness of connection by and between the tip and wing rails, which may manifest by release of joints.
• Assembled frogs from rails according to CZ utility model No. 6952 show lower rigidity and they are subject to fast wear and tear.
• the construction solution of this type of frog does not offer necessary compactness of connection of individual parts assembled one to each other, which manifests by release of construction joints, loss of rigidity and shorter service life.
• the construction setup of the trimmed mono-block brings advantages of complete mono- block frogs in the meaning of monolith setting and mechanic static and dynamic definiteness of construction, the load-bearing part of is secured in the place of railway wheels passage via the groove by a monolithic cast, while there is preserved the advantage of trimmed mono-block, i.e. savings of expensive cast material and simplification of manufacture, i.e. reducing the length of the cast and related elimination of foundry faults and costs on levelling and other related production costs.
• connection and tip rails makes by its static and dynamic characteristics - by its placement in one plane - a compact structure comparable with all-cast mono-block structure.
• the non-detachable joints are performed by welding while meeting the concurrence of geometric shapes of connection and tip rails and the mono-block cast with allowed variation of flatness in the area of welds.
• Fig. 1 shows the structural design of the frog with trimmed mono-block with optimized shape of the cast
• Fig. 2 shows the mono-block cast in detail of the connection area
• Fig. 3 shows cross-section A-A of the mono-block cast in front of the outer transition and inner transition
• Fig. 45 shows the cross- section B-B of the mono-block cast in the place of extension of the cast footing from the inner side wall
• Fig. 5 shows the cross-section C-C of the mono-block cast in the place of extension of the cast footing from the outer side wall
• Fig. 6 shows the cross-section D-D of the mono- block cast in connection of tip and wing rails using high-strength screws via inserts.
• Fig. 1 consists of a trimmed cast of the mono-block 1 non-detachably connected on one side of the frog in front of the beginning 2 of the cast with two pieces of connection rails 3 and on the other side with non-detachably connected tip rails 4, while the trimmed cast of the mono-block I is non-detachably connected in the place of the widest part of the tip 5 of the cast of the mono-block i with tip rails 4.
• the double-sided wing rails 7 making the grooves 6 run-outs from the cast of the mono-block ⁇ are detachably connected with the part of the cast of the mono-block I by high-strength screws 8 and with the part of tip rails 4 by high-strength screws 8J via the inserts 9.
• Fig. 3 up to 6 so as to increase the rigidity of the cast of the mono-block i , there are - according to Fig.
• the heads 13 of the wing rails 7 are mated from the side with outer side walls 12 of the mono-block 1 cast by machining in vertical direction into a plane without securing the wing rails 7 against movement in vertical direction.
• the footings 14 of the wing rails 7 are machined in such a way so as there is clearance above the footing ⁇ . of the mono-block L
• the non-detachably connected cast of the mono-block 1 with connection rails 3 and tip rails 4 with its placement in one plane will make a compact structure by its static and dynamic characteristics.
• the technical solution can be used for all the types of switches, mainly the switches designed for modernization of railways with high demands towards rigidity and resistance against dynamic wear and tear.
• the technical solution can be favourable used even for switches in public tram transport.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Component Parts Of Construction Machinery (AREA)
• Foundations (AREA)

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Applications Claiming Priority (2)

Publications (1)

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Cited By (1)

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Citations (4)

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• 2016
  • 2016-07-21 CZ CZ2016-32600U patent/CZ30786U1/cs active Protection Beyond IP Right Term
• 2017
  • 2017-07-20 AU AU2017300466A patent/AU2017300466B2/en active Active
  • 2017-07-20 WO PCT/CZ2017/000047 patent/WO2018014887A1/en unknown
  • 2017-07-20 EP EP17830519.9A patent/EP3507419A4/en active Pending

Patent Citations (4)

Non-Patent Citations (1)

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