Granted Patent B2

US 8,104,846 · App. 12/368,125 · Granted Jan 31, 2012

Abstract

Claims (28)

1. A crawler for allowing a vehicle to move over the ground, having a track connection system and a track tensioning system, comprising:

a) a crawler frame;

b) at least one drive tumbler supported on the frame;

c) a track made of a plurality of track shoes having a ground engaging surface, the track shoes being connected in series to produce a track having a first end and second end that can be connected together to form the track into an endless track, the track being wrapped around the frame, with the first and second ends spaced apart but each adjacent a section of the frame;

d) a track connection system mounted to the frame comprising:

i) a mover device connected to the frame; and

ii) a track engagement member coupled between the mover device and the track;

iii) whereby actuation of the mover device causes the track engagement member to move the track into a position where the first and second ends can be connected; and

e) a track tensioning system mounted on the frame, the track tensioning system utilizing at least portions of the mover device of the track connection system.

2. The crawler of claim 1 wherein actuation of the mover device moves the first end of the track towards the second end of the track.

3. The crawler of claim 2 further comprising a second track connection system mounted to the frame comprising a second mover device connected to the frame and a track engagement member coupled between the second mover device and the track; whereby actuation of the second mover device causes the track engagement member to move the second end of the track towards the first end of the track.

4. The crawler of claim 1 wherein the mover device comprises a hydraulically powered device.

5. The crawler of claim 1 wherein the mover device comprises a linear actuation device selected from the group consisting of a hydraulic cylinder, a rack and pinion drive and a worm gear drive.

6. The crawler of claim 1 wherein the mover device comprises a first arm member having a first end pivotally connected to the frame and a second end supporting a roller that engages the inside surface of the track, and a linear actuation device mounted between the frame and the first arm member.

7. The crawler of claim 6 wherein the mover device further comprises a second arm member having a first end pivotally connected to the frame and a second end, and a link having a first end pivotally connected to the first arm member and a second end pivotally connected to a second arm member, and wherein the track engagement member is coupled between the link and the track.

8. A lift crane comprising a plurality of crawlers wherein each crawler comprises a track connection system and a track tensioning system of claim 1 .

9. A method of connecting ends of a track on a crawler used to allow a vehicle to move over the ground and thereafter tensioning the track, the crawler comprising: i) a crawler frame ii) at least one drive tumbler supported on the frame; and iii) a track made of a plurality of track shoes and having a ground engaging surface, the track shoes being connected in series to produce a track having a first end and second end that can be connected together to form the track into an endless track, the track being wrapped around the frame, with the first and second ends spaced apart but each adjacent a section of the frame; the method of connecting ends of the track comprising: using a track connection system comprising a mover device connected to the frame, and a track engagement member coupled between the mover device and the track, to move the track into a position where the first and second ends can be connected; and the method of tensioning the track also using at least part of the mover device to tension the track during operation of the crawler.

10. The method of claim 9 wherein the mover device is hydraulically powered.

11. The method of claim 9 wherein, during the track connection operation, the mover device pulls the first end of the track towards the second end of the track, and a second mover device connected to the frame is coupled to the track with a second track engagement member, and pulls the second end of the track towards the first end of the track.

12. A crawler for allowing a vehicle to move over the ground, having a track connection system, comprising:

a) a crawler frame;

b) at least one drive tumbler supported on the frame;

c) a track made of a plurality of track shoes having a ground engaging surface, the track shoes being connected in series to produce a track having a first end and second end that can be connected together to form the track into an endless track, the track being wrapped around the frame, with the first and second ends spaced apart but each adjacent a section of the frame; and

d) a track connection system mounted to the frame comprising:

i) a mover device connected to the frame, the mover device comprising a first arm member having a first end pivotally connected to the frame and a second end supporting a roller that engages the inside surface of the track, and a linear actuation device mounted between the frame and the first arm member; and

ii) a track engagement member coupled between the mover device and the track;

iii) whereby actuation of the mover device causes the track engagement member to move the track into a position where the first and second ends can be connected.

13. The crawler of claim 12 wherein the mover device further comprises a second arm member having a first end pivotally connected to the frame and a second end, and a link having a first end pivotally connected to the first arm member and a second end pivotally connected to a second arm member, and wherein the track engagement member is coupled between the link and the track.

Assignments (10)