1. A tractor dolly assembly for use in towing a semi-tractor tractor having a cab, frame, front and rear wheels and a fifth wheel assembly, the tractor dolly assembly comprising:
a chassis assembly formed to be solely support on one end to a rear frame of a vehicle between the cab and the fifth wheel assembly; and
a wheeled cart assembly coupled to an opposing end of said chassis assembly, said wheeled cart assembly including a frame and at least one axle for receiving a pair of wheels; said at least one axle mechanically coupled to said frame by way of a lifting mechanism for varying the distance between said at least one axle and said frame.
2. The tractor dolly assembly as recited in claim 1, wherein said wheeled cart assembly wherein said at least one axle is a self-steering axle.
3. The tractor dolly assembly as recited in claim 1, wherein one end of said chassis assembly is formed with a step so that said one end of said chassis assembly is able to be supported on the frame of the semi-tractor to be towed between the cab and the fifth wheel assembly and avoid contact with a fifth wheel assembly for vehicles so equipped.
4. The tractor dolly assembly as recited in claim 1, wherein said chassis assembly includes an adjustable stand-off assembly for enabling the height of the front portion of said chassis assembly to be adjusted relative to said frame of said semi tractor.
5. The tractor dolly assembly as recited in claim 1, further including a draw bar mechanically coupled to a rear portion of the tractor dolly assembly to enable said vehicle to be towed in a reverse direction.
6. The tractor dolly assembly as recited in claim 1, wherein said chassis assembly is configured to accommodate vehicles having vehicle frames of different heights.
7. The tractor dolly assembly as recited in claim 1, further including a stand-off assembly coupled to said one end of said chassis assembly , said stand-off assembly including shoes for capturing the frame of said semi-tractor.
8. The tractor dolly assembly as recited in claim 7, wherein said said shoes are adjustable for engaging frames of semi-tractors having different widths.
9. The tractor dolly assembly as recited in claim 1, wherein said chassis assembly includes a bumper.
10. A tractor dolly assembly for use in towing a semi tractor having a cab, frame and a fifth wheel assembly, the tractor dolly assembly comprising:
a wheeled cart having a frame and at least one axle for carrying a pair of wheels and, said tractor dolly further including a lift mechanism which enables the rear wheels of the semi-tractor to be lifted when said tractor dolly assembly is mechanically coupled to a semi tractor in both a forward and reverse towing direction; and
a chassis assembly rigidly attached on one end to said wheeled cart and formed on an opposing end to be solely supported by said frame between said cab and said fifth wheel assembly.
11. The tractor dolly assembly as recited in claim 10, wherein said frame of said tractor dolly is formed to attach directly to the tractor frame without being coupled to the fifth wheel assembly.
12. The tractor dolly assembly as recited in claim 10, wherein said at least one axle for carrying a pair of wheels are configured as self-steering wheels.
13. A tractor dolly assembly as recited in claim 10 comprising:
a tractor dolly having at least one axle for carrying a pair of wheels, said tractor dolly configured to be mechanically coupled to a semi tractor to enable said semi tractor to be towed by another vehicle in either a forward direction or a reverse direction with the rear wheels of the tractor raised in both directions; and wherein said tractor dolly is formed to accommodate vehicles having vehicle frames of different heights.
14. A tractor dolly assembly as recited in claim 10 comprising:
a tractor dolly having at least one axle for carrying a pair of wheels, said tractor dolly configured to be mechanically coupled to a semi tractor to enable said semi tractor to be towed by another vehicle in either a forward direction or a reverse direction with the rear wheels of the tractor raised in both directions; and wherein said tractor dolly is formed to accommodate vehicles having vehicle frames of different widths.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for address resolution protocol (ARP) resolution over a link aggregation to a cluster of intermediary devices, the method comprising:
(a) establishing a link aggregation to a cluster of intermediary devices deployed between a plurality of a clients and a plurality of servers, the link aggregation comprising network interfaces to different intermediary devices in the cluster;
(b) transmitting, by a first intermediary device of the cluster, an address resolution protocol (ARP) request on a network to resolve an internet protocol (IP) address;
(c) transmitting, by the first intermediary device of the cluster, a message to each of the other intermediary devices in the link aggregation to expect a reply to the ARP request; and
(d) receiving, by a second intermediary device of the cluster via the link aggregation, the reply to the ARP request.
2. The method of claim 1, further comprising sending, by the second intermediary device via a common data backplane of the cluster, to the other intermediary devices of the link aggregation a message to update an ARP entry for the IP address.
3. The method of claim 1, further comprising updating, by the second intermediary device, a local ARP entry based on the reply to the ARP request.
4. The method of claim 1, wherein step (a) further comprises establishing the link aggregation between the cluster and a switch, the switch not aware that the link aggregation is connected to different intermediary devices in the cluster.
5. The method of claim 1, wherein step (b) further comprises transmitting, by the first intermediary device, the ARP request on a network external to the cluster via the link aggregation.
6. The method of claim 1, wherein step (c) further comprises transmitting, by the first intermediary device, the message to each of other intermediary devices via a common data backplane of the cluster.
7. The method of claim 1, wherein step (c) further comprises transmitting, by the first intermediary device, the message to each of the other intermediary devices in the link aggregation to inform the other intermediary devices in the link aggregation of the ARP reply.
8. The method of claim 1, wherein step (d) further comprises receiving, by the second intermediary device via the link aggregation, the ARP reply comprising resolution of the IP address on an external network.
9. The method of claim 1, further comprising receiving, by an intermediary device of the cluster via the link aggregation, a Gratuitous ARP (GARP) message for an external IP address.
10. The method of claim 9, further comprising updating, by the intermediary device, the intermediary device’s local ARP entry and sending to each of the other intermediary device of the link aggregation a message to update their respective ARP entries.
11. A system for address resolution protocol (ARP) resolution over a link aggregation to a cluster of intermediary devices, the system comprising:
a cluster of intermediary devices deployed between a plurality of a clients and a plurality of servers;
a link aggregation to the cluster of intermediary devices, the link aggregation comprising network interfaces to different intermediary devices in the cluster;
a first intermediary device of the cluster transmitting an address resolution protocol (ARP) request on a network to resolve an internet protocol (IP) address and a message to each of the other intermediary devices in the link aggregation to expect a reply to the ARP request; and
a second intermediary device of the cluster receiving via the link aggregation the reply to the ARP request.
12. The system of claim 11, wherein the second intermediary device sends via a common data backplane of the cluster, to the other intermediary devices of the link aggregation a message to update an ARP entry for the IP address.
13. The system of claim 11, wherein the second intermediary device updates a local ARP entry based on the reply to the ARP request.
14. The system of claim 11, wherein the link aggregation is established between the cluster and a switch, the switch not aware that the link aggregation is connected to different intermediary devices in the cluster.
15. The system of claim 11, wherein the first intermediary device transmits the ARP request on a network external to the cluster via the link aggregation.
16. The system of claim 11, wherein the first intermediary device transmits the message to each of other intermediary devices via a common data backplane of the cluster.
17. The system of claim 11, wherein the first intermediary device sends the message to each of the other intermediary devices in the link aggregation to inform the other intermediary devices in the link aggregation of the ARP reply.
18. The system of claim 11, wherein the second intermediary device receives via the link aggregation, the ARP reply comprising resolution of the IP address on an external network.
19. The system of claim 11, an intermediary device of the cluster receives via the link aggregation a Gratuitous ARP (GARP) message for an external IP address.
20. The system of claim 19, wherein the intermediary device updates the intermediary device’s local ARP entry and sends to each of the other intermediary device of the link aggregation a message to update their respective ARP entries.