Motor vehicles – Special driving device – Portable track
Patent
1981-03-30
1983-06-14
Pekar, John A.
Motor vehicles
Special driving device
Portable track
B62D 5506
Patent
active
043877796
DESCRIPTION:
BRIEF SUMMARY
This application relates to a sideboom crawler suspension, and more particularly to vertically standing track roller frames disposed at either side of the crawler and braced by a special linkage provided at each side to keep the track roller frame at that side from twisting from its vertical plane. The frame-twisting or tilting force exerted in the suspension intensifies when the sideboom crawler is doing sidehill work, especially when the track assembly on either frame encounters the berm, and the torsion is accentuated in any case because the force of the boom on the side of the crawler is designed to be reacted directly into the track frame at that side. The torsion, if left to go unopposed, will act as a force couple rotating one end of a track frame in a transverse plane so as to change position at different times and undesirably grow close to and draw away from an adjacent main chassis frame provided on the crawler.
My vehicle has utility of the type generally as borne out by a usage taught in the U.S. Class 212 particularly adapted for side loader boom attachments. Patents in that class relevant to the particular adaptation as stated include expired U.S. Pat. Nos. 2,425,663; 2,712,873; 2,885,092; 3,005,559; and unexpired U.S. Pat. Nos. 3,236,391; 3,329,283; 3,426,915; 3,785,503; 3,938,669; 3,990,583; and 4,083,459. The descriptions of such an attachment in all of those patent disclosures, and in each one, are incorporated by reference in entirety herein. The usage referred to, generally but not necessarily, is as a pipelayer as the most common type.
My vehicle in terms of undercarriage is of the type generally as borne out by a crawler suspension as taught in the U.S. Class 180 adapted for having its track support mounted for vertical movement. Patents in that class relevant to the particular adaptation as stated include expired U.S. Pat. No. 1,429,473 and unexpired U.S. Pat. No. 3,980,149. The descriptions of such a suspension in all of those patent disclosures, and in each one, are incorporated by reference in entirety herein.
In the crawler here concerned, equipped at the sides with the described track roller frames, I provide three-point contact with the frame at each side as basis for ensuring the single plane frame stability sought. The diagonal braces, conventionally applied, are here altogether eliminated. Instead first, the crawler carries a crossbar common to the track frames and made rigid with them at the forward end. Second, the crawler carries pivot shaft halves provided one to each one of the frames and making a lower mounting connection with them at their rear end portion. Third, a brace linkage between and secured to the crawler and each frame makes an upper mounting connection with the latter frames at their rear end portion. Each frame at its lower connection has a stress relieved mounting I provide for it on the end of the shaft, so that the latter can in effect pivot at its end for the total amount, however slight, called for due to the limited vertical deflections occurring in the shaft as the crawler travels. Also, each frame at its upper connection is afforded a stress relieved mounting to the crawler by the brace linkage on which I provide pivots at both ends, so as to pivot simultaneously relative to the crawler and track frame in accommodating to the vertical shaft deflections, however slight.
So each track frame, free from residual torsional stresses being imparted thereto by the relatively upwardly disposed stress relieved brace linkages or the lower disposed stress relieved pivot shaft, is in effect guided by a complete parallelogram linkage resisting torsional twist in the rear end portion and forcing it to maintain the vertical disposition desired. That is to say, the stress relief in the vertically spaced apart frame connections at the rear makes each mounting self-aligning to the geometry of the parallelogram.
Further features, objects, and advantages will either be particularly pointed out or become apparent when, for a better understanding of my invention, referen
REFERENCES:
patent: 1429473 (1922-09-01), Wickersham
patent: 1618203 (1927-02-01), Jett
patent: 2425663 (1947-08-01), Wooldridge
patent: 2453360 (1948-11-01), Burks
patent: 2712873 (1955-07-01), Peterson
patent: 2885092 (1959-05-01), Murrey
patent: 3005559 (1961-10-01), Toderick
patent: 3236391 (1966-02-01), Kennedy
patent: 3329283 (1967-07-01), Wade
patent: 3426915 (1969-02-01), Tesch
patent: 3785503 (1974-01-01), Butterfield
patent: 3938669 (1976-02-01), Vinton
patent: 3980149 (1976-09-01), Blomstrom et al.
patent: 3990583 (1976-11-01), Nishida et al.
patent: 4083459 (1978-04-01), Allen
patent: 4086974 (1978-05-01), Leclerc
Deutsch B. E.
Dresser Industries Inc.
Pekar John A.
LandOfFree
Sideboom crawler suspension does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sideboom crawler suspension, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sideboom crawler suspension will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-159627