Railways – Turntables – Automobile
Patent
1986-12-05
1989-06-27
Cherry, Johnny D.
Railways
Turntables
Automobile
104 47, B60S 1302
Patent
active
048418706
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to turntables of the kind described in Australian Pat. No. 539404, in which the turntable has an axis of rotation which is inclined relative to two orthogonal planes, so that rotation of the turntable is achieved by utilising the weight of the vehicle.
BACKGROUND ART
In the embodiment described in the abovementioned Australian patent, the turntable in braked automatically upon turning through 180.degree. by the engagement of a braking blade with a retaining slot in a member mounted for linear movement against a compression spring in a recoil device fixed beneath the turntable.
SUMMARY OF THE INVENTION
Among the objects of the present invention are the provision of a braking and locking system which provides operational advantages over that described in the abovementioned Australian patent, and a mode of construction which offers advantages in the manner of manufacture and installation of the turntable. The invention broadly resides in a motor vehicle turntable comprising rotatable vehicle support means the axis of rotation of which is inclined relative to othorgonal vertical planes and brake means for arresting the rotation of said turntable, characterised in that said brake means comprises detent engagement means at spaced arcuately disposed locations concentric with said axis, and detent means rotating with the turntable for braking engagement with said engagement means.
Reference will now be made to the accompanying drawings, in which an embodiment of the invention is shown by way of example only.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings,
FIG. 1 is a plan view of a turntable embodying the present invention, with components partly broken away to show the mounting structure and operating mechanism;
FIG. 2 is a side elevation of the turntable of FIG. 1;
FIG. 3 is a fragmentary plan view of components of a modified braking mechanism; and
FIG. 4 is a fragmentary front elevation of the mechanism of FIG. 3.
DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
The turntable illustrated in FIGS. 1 and 2 comprises a pair of runways 10, mounted on a centre frame assembly 11, which is in turn mounted on a slew ring 12 for rotation on a base plate 13.
As shown in FIG. 2, the base plate 13 is mounted on a surface such as a concrete driveway or garage floor by means of bosses 14, and fixed by masonry anchors 15 which pass through these bosses. The height of each of the bosses 14 differs, and is chosen so as to tilt the axis of rotation of the turntable to achieve the operation described in the abovementioned patent specification. It is found that a slope of the base from one side to the other of 1 in 40, combined with a slope from rear to front of 1 in 20, provides satisfactory action. The base plate 13 is provided at its centre with a boss, not visible in the drawings, with a central hole for locating the bottom end of the pivot pin of the toothed segment bar 18 described below.
The slew ring 12, which may be a substantially unmodified slew ring as manufactured for articulated vehicles, is separated from the base plate 13 by spacers 16, which are drilled to receive bolts 17 by which the slew ring is fixed to the base plate. The purpose of this spacing is to provide for the location between the base plate and the slew ring, of a toothed segment bar 18, described in detail below, which is pivoted on the central pivot pin of the turntable.
Each runway comprises a pair of steel channel sections 19 which form the sides of the runway, and a deck 20 consisting of roll-formed steel decking of suitable profile such as that shown in FIG. 2.
The runways are fixed to the centre frame assembly by means of plates 21 welded to and extending downwardly from each channel section 19, these plates 21 being fixed to angle members 22 and plates 23 carried by a pair of cross-members 24 of the assembly 11.
The centre frame assembly 11 consists of the cross-members 24, a diagonal member 25 an a pair of diagonal members 25a, side members 26 and lateral members 27, these com
REFERENCES:
patent: 1665997 (1928-04-01), Austin
patent: 2135924 (1938-11-01), Toews
patent: 3170411 (1965-02-01), Howard
patent: 3583326 (1971-06-01), Poissant
patent: 3713549 (1973-01-01), Routhier
patent: 3888184 (1975-06-01), Maeda
patent: 4562774 (1986-01-01), Dehring
patent: 4676171 (1987-06-01), Kelderman
Cherry Johnny D.
K.G. Coles & Co. Pty. Limited
Stormer Russell D.
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