An improved method of manufacturing Dearings for ще ббигдалю of Spindles and Constructing Chills and Mandrils for the same.
Year: 1887

page_text: Date of Application, 26th May, 1887.
Specification Accepted, 28th June, 1887.
An improved method of manufacturing Dearings for ще ббигдалю
of Spindles and Constructing Chills and Mandrils for the same.
I FRANK GARRETT of Leiston Works in the County of Suffolk Agricultural
Engineer do hereby declare the nature of this Invention and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement :-
The object of this Invention is an improvement in the method of manufacturing
bearings of Babbitt's metal or other alloys which are capable of being cast on chills.
Hitherto it has been usual to bush the bearings plummer blocks or brackets
intended to be lined with these alloys by pouring into them the molten metal first
placing therein the journals of the spindles themselves or round mandrils which are
facsimiles of the journals of the spindles.
This process is attended with considerable inconvenience and expense to the
manufacturer and when the bushes are worn there has been found considerable
inconvenience in their replacement whilst they possess the great disadvantage of
being generally incapable of adjustment.
As an alternative to bushes, bearings made of these alloys in separate halves or
pieces have been cast around mandrils laid in sand moulds but under these circum-
stances the bearings are not accurately interchangeable without fitting.
The foregoing disadvantages I overcome under my Invention which may be
described as follows having reference to the annexed drawings.
In Figures 1 and 2 A is an iron mandril consisting of two halves a a forming
together an exact facsimile of the journals for which the bearings are required.
In manufacturing these mandrils I prefer to use two rectangular or half round
bars a. a. Fig. 3. each of which is first accurately surfaced on one side. The surfaced
sides or faces of these bars are then opposed to each other and the bars are fixed
together by means of screws or pins and turned on their exterior surfaces so as to
form an exact facsimile of the journal (Fig. 1) of the spindle. The two parts a. a of
the mandril A are then divided by means of the winged plate B Fig. 4 which may be
of any desired thickness and which is surfaced on both its sides so as to make a

page_text: perfect joint with the two halves a. a. of the mandril A and also with the halves c. c.
of the chill C hereinafter mentioned.
C is an iron mould or chill forming the exterior outline of the bearings and
consisting of two halves c. c. which are accurately surfaced where they come together
so that they may together form an exact facsimile of the interior outline of the
plummer block or bracket for which the bearings are required.
'
When casting the interchangeable bearings under my process the iron mandril A is
placed within the iron mould or chill C (Figures 5 and 6) in such a manner that
the wings of the plate B which separates the two halves a. a. of the mandril A may
also divide the two halves c. c. of the iron mould or chill C which are then bolted or
cramped together as usual with moulding flasks or boxes (Fig. 5).
The iron mould or chill is then placed endwise (by preference in the sand) and
the metal is poured through the holes E E in each half a. a of the mandril A so as to
fill the cavity existing between each half a. a. of the mandril A and the respective
halves c. c. of the iron mould or chill C Figures 5 and 6.
The chilled bearings can be forced from the chill C without injury by means of the
screw F and the loose section G fitted into the centre of the chill C Figures 5 and 6.
Bearings cast in this manner are accurately interchangeable and possess an
uniformly smooth surface both internally and externally.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. The method of casting interchangeable bearings in two halves of Babbitt's metal
or other similar alloys by means of iron chills and mandrils each formed of two
separate halves or pieces separated by a surfaced plate and in such a manner that the
cavities between the respective halves or pieces of the said chills and mandrils may
represent the exact form of the finished bearings in two accurate halves together
forming a complete circle as required for use substantially as and in the manner
herein before described.
2. The construction in halves or pieces separated by a surfaced plate of chills and
mandrils to serve as moulds for casting interchangeable bearings of Babbitt's
metal or other similar alloys in such a manner that the cavities between the
respective halves or pieces of the said chills and mandrils may represent the exact
form of the finished bearings in two halves together forming a complete circle as
required for use substantially as and in the manner hereinbefore described.
The 26th day of May 1887.