Land vehicles: dumping – Tilting – Tilting about plural or shifting fulcrums
Patent
1991-01-07
1992-08-25
Spar, Robert J.
Land vehicles: dumping
Tilting
Tilting about plural or shifting fulcrums
298 22C, 414705, E02F 376, E02F 3345
Patent
active
051412888
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to an arrangement of implements holders for assemblies including side-dumping excavating and loading buckets comprising a holder, a bucket, a hydraulic dumping ram for side-tipping the bucket around one of two journal assemblies. Each of the journal assemblies cooperates with locking devices to permit side-dumping about one of the journal assemblies based on the position of the locking devices. A hydraulic control circuit is provided which includes the side dumping ram and which sequences the locking devices to unlock the locking device on the side opposite which the bucket is to be dumped before the side dumping ram is operated.
State of the Art
Such an arrangement in implement holders for assemblies equipped with side-dumping excavating and loading buckets is previously known from SE-C-214 750 (The Frank G. Hough Company).
Excavating and loading assemblies of a similar kind are previously known to the art from, for instance, SE-A-8501093-2 (publication No. 447 742) (Leijon), SE-B-215 153 (Leijon) and SE-B-219 549 (Leijon), all three of which are further developments of the invention described in SE-B-166 157 (Bodin). This latter publication has a counterpart in U.S. Pat. No. 2,924,345 (Bodin).
The bucket of such an assembly shall be locked to the holder in the central position in some reliable manner, and to this end is provided with locking devices which co-act with the journal devices used. The journal devices may, alternatively, be releasable, such as to permit selective dumping on either side.
It has been found in practice, however, that in certain instances the bucket is not locked reliably to the holder. This may be due to the fact, for instance, that gravel, stones or dirt has penetrated those locations in which the locking devices are intended to grip, so that said devices are unable to move to their intended locking positions. At times, foreign particles of the aforesaid kind will fasten between the bucket-journaling devices carried by the holder and the bucket-journals co-acting therewith, such as to prevent the bucket from taking its intended rest or non-operative position. This means, in turn, that the locking devices are unable to take a position in which the bucket is locked correctly to the holder.
Malfunctioning of the bucket locking devices may also be due to other causes. For instance, subsequent to activating the operating valve for side-dumping in one direction, e.g. on the left, the operator may activate the controls for side-dumping in the other direction, on the right, before the first dumping operation has been completed.
Another drawback with this known arrangement is that there is a risk that the bucket will not be connected to the holder in the manner intended, but that the bucket simply lies and "rocks" on the holder, thereby subjecting the assembly to the risk of serious, and perhaps irreparable damage.
Of course, the large stresses to which a bucket of this kind is subjected and the particular enviornment in which the bucket works must be taken into account in this context.
The aforesaid drawbacks also apply to other known arrangements, for instance the arrangements described and illustrated in U.S. Pat. No. 3,022,910 (Anderson), U.S. Pat. No. 3,203,565 and U.S. Pat. No. RE-26268 (Keskitalo), U.S. Pat. No. 3,198,358 (Gardner), U.S. Pat. No. 4,307,992 (Robnett) and U.S. Pat. No. 4,341,026 (Uchida et al). The arrangements described in these publications are, as a rule, complicated and require the inclusion of a plurality of different circuits for operating the drive-locking arrangement provided, and these arrangements are also emcumbered with the aforesaid serious defficiency of unreliable locking of the bucket to the holder.
SE-B-355 848 (Leijon) describes a hydraulic drive arrangement for two mutually independent functions, sometimes referred to as "all-in-one-cylinder", which includes two double-acting hydraulic rams, the pistons of which each have a specific starting position and with which each of the pistons can be ope
REFERENCES:
patent: 3203565 (1965-08-01), Keskitalo
patent: 3402841 (1968-09-01), Salna et al.
patent: 3531007 (1970-09-01), Leijon
patent: 3556330 (1971-01-01), Keskitalo
patent: 3620458 (1971-11-01), Rath
patent: 4220438 (1980-09-01), Anderson
patent: 4307992 (1981-12-01), Robnett
patent: 4341026 (1982-07-01), Uchida et al.
patent: 4568028 (1986-02-01), Verseef et al.
patent: 4773598 (1988-09-01), Jones
Dinicola Brian
Nordiska Industrimaskiner AB
Spar Robert J.
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