Claims
- 1. A variable wheel-spacing truck, comprising:
- a pair of bogie frames each having a substantially T-letter shape, an end portion of a transom of one of the bogie frames overlapping with a side beam of another of the bogie frames,
- a pair of vehicle supports mounted on the pair of bogie frames, each support including an elastic body,
- a locking mechanism capable of releasably locking the pair of bogie frames at plural positions against movement in a widthwise direction of the truck,
- auxiliary wheels associated with the locking mechanism and vertically movable to switch the locking mechanism between a locked state preventing transverse movement of the bogie frames and a released state permitting transverse movement of the bogie frames,
- a pair of support wheels, at least one of the support wheels being allowed to slide relative to a wheel shaft in an axial direction of the wheel shaft, and
- axle boxes and supporting members each engaged with a respective one of said bogie frames, and supporting a respective one of the support wheels.
- 2. A variable wheel-spacing truck as claimed in claim 1, wherein one of the support wheels comprises a fixed wheel which is prevented from sliding relative to the wheel shaft in the axial direction of the wheel shaft, and a portion of the wheel shaft at a side of the fixed wheel is engaged with an associated one of the bogie frames to be supported thereby through associated ones of the shaft boxes and supporting members.
- 3. A variable wheel-spacing truck as claimed in claim 1, wherein both of said pair of support wheels are allowed to slide relative to the wheel shaft in the axial direction of the wheel shaft.
- 4. A variable wheel-spacing truck as claimed in claim 1, wherein said locking mechanism includes said auxiliary wheels between the pair of support wheels so as to act to raise or lower the bogie frames relative to the other one of the bogie frames, thereby separating or engaging the bogie frames with respect to each other for releasing or locking the fixing of the bogie frames.
- 5. A variable wheel-spacing truck as claimed in claim 1, wherein each of the auxiliary wheels is connected to the transom of one of the bogie frames to engage or separate the transom from the other of the bogie frames to switch the locking mechanism between its locked and released states.
- 6. A variable wheel-spacing truck as claimed in claim 1, wherein said locking mechanism includes a locking pin capable of releasably locking the fixing of the bogie frames by help of vertical motions of said auxiliary wheels.
- 7. A variable wheel-spacing truck as claimed in claim 1, wherein the slidable support wheel is allowed to rotate around the wheel shaft.
- 8. A variable wheel-spacing truck as claimed in claim 1, wherein the slidable support wheel is prevented from rotating relative to the wheel shaft.
- 9. A variable wheel-spacing truck as claimed in claim 5 wherein the auxiliary wheels are located outboard of the support wheels in the widthwise direction of the truck.
- 10. A variable wheel-spacing truck as claimed in claim 1 including a guide formed on the side-beam of each said bogie frame for guiding the transom of the other bogie frame for movement in the transverse direction of the truck.
- 11. A variable wheel-spacing truck comprising:
- first and second substantially T-shaped bogie frames each having a side beam and a transom extending from the side beam and overlapping the side beam of the other bogie frame, the transom of each said bogie frame being movable by pivoting about the side beam of the bogie frame into and out of locking engagement with the other bogie frame;
- first and second support wheels supported by the first and second bogie frames, respectively; and
- a vertically movable auxiliary wheel connected to each transom for pivoting the transom of each said bogie frame into and out of locking engagement with the other bogie frame.
- 12. A variable wheel-spacing truck as claimed in claim 11 wherein the transom of each said bogie frame is movable into and out of locking engagement with the side beam of the other bogie frame.
- 13. A variable wheel-spacing truck as claimed in claim 11 wherein the transom of each said bogie frame has an end disposed above the side beam of the other bogie frame, and each auxiliary wheel is supported on an arm extending from the transom of one of the bogie frames and passing beneath the side beam of the other bogie frame.
- 14. A variable wheel-spacing truck as claimed in claim 11 wherein the auxiliary wheels are disposed outboard of the support wheels in a widthwise direction of the truck.
- 15. A variable wheel-spacing truck as claimed in claim 11 including a plurality of links each pivotably connected between the transom of one of the bogie frames and the other bogie frame.
- 16. A variable wheel-spacing truck as claimed in claim 15 wherein the links and the transoms define a parallelogram linkage.
- 17. A variable wheel-spacing truck as claimed in claim 15 including an elastic vehicle support mounted on each said link.
- 18. A variable wheel-spacing truck as claimed in claim 11 wherein the transom of each said bogie frame has a surface opposing a surface of the side beam of the other bogie frame, and a projection and a plurality of recesses for locking engagement with the projection are formed on the opposing surfaces.
- 19. A variable wheel-spacing truck as claimed in claim 18 wherein each said projection comprises a pin disposed on one of the opposing surfaces.
- 20. A variable wheel-spacing truck comprising:
- first and second substantially T-shaped bogie frames each having a side beam and a transom extending from the side beam and overlapping the side beam of the other bogie frame, the bogie frames being movable relative to each other in a transverse direction of the truck to vary the spacing between the bogie frames;
- first and second support wheels supported by the first and second bogie frames, respectively;
- a pair of links each having a first end pivotably connected to the transom of one of the bogie frames and a second end pivotably connected to the other bogie frame; and
- a vehicle support including an elastic body mounted on each said link.
- 21. A variable wheel-spacing truck as claimed in claim 20 wherein the first and second links are disposed on opposite widthwise sides of the truck.
- 22. A variable wheel-spacing truck as claimed in claim 20 wherein the transoms and the links define a parallelogram linkage.
Priority Claims (2)
Number |
Date |
Country |
Kind |
4-308151 |
Oct 1992 |
JPX |
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4-308152 |
Oct 1992 |
JPX |
|
Parent Case Info
This application is a division of patent application Ser. No. 08/139,175, filed Oct. 21, 1993, now U.S. Pat. No. 5,421,265.
US Referenced Citations (10)
Foreign Referenced Citations (5)
Number |
Date |
Country |
2738046 |
Mar 1978 |
DEX |
2739670 |
Mar 1979 |
DEX |
54-47221 |
Apr 1979 |
JPX |
18292 |
Jan 1911 |
GBX |
1173069 |
Dec 1969 |
GBX |
Non-Patent Literature Citations (1)
Entry |
"Talgo Trains on Two Gauges", The Railway Gazette, Feb. 21, 1969, pp. 136-142. |
Divisions (1)
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Number |
Date |
Country |
Parent |
139175 |
Oct 1993 |
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