Improvements in Machines for Cutting Oil-grooves in Steps, Bearings, Pedestals, Plummer-blocks and similar Articles.
Year: 1899

page_text: Date of Application, 12th Dec., 1899
Complete Specification Left, 11th Sept., 1990-Accepted, 17th Nov., 1900
Improvements in Machines for Cutting Oil-grooves in Steps, Bearings,
Pedestals, Plummer-blocks and similar Articles.
EDWARD MEREDITH GRIFFITHS, 1, 2 & 3, Ludgate Square, London, E.C.,
Machinery Merchant, do hereby declare the nature of this invention to be as
follows:-
-
¡
In a machine-The combination of a reciprocating motion and, when re-
quired, a rotating motion, variable in relation one to the other with a method
of advancing or withdrawing the cutting tool or tools, and the provision of an
adjustable platform for holding the work and quickly fixing the same, also having
an adjustable stop for regulating the difference between the centres of the tool-
holder and pedestal.
The machine has a spindle and attached to one end is the cutting tool and to
the other the means by which the tool is advanced to or withdrawn from the
work. This spindle can be rotated by means of gear wheels to give spirals of
different pitches or can be traversed without rotating for cutting straight grooves,
for which purpose it can be fitted with a rack & pinion or similar means of tra-
verse. The bearings to be grooved are placed on a suitable platform in front
of or under the cutting tool and the adjustment of platform can be effected by
screws or other similar method.
Dated this 16th day of February One Thousand Nine Hundred.
Improvements in Machines for Cutting Oil-grooves in Steps, Bearings,
Pedestals, Plummer-blocks and similar Articles.
I, EDWARD MEREDITH GRIFFITHS, of 1, 2 & 3, Ludgate Square, in the City
of London, Machinery Merchant, 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:-
My invention has for its object the provision of means for producing straight
or spiral oil grooves of any required pitch in steps plummer-blocks and the
like, whereby the operation is performed with greater ease and a better finished
groove is produced than is possible with present methods.
In one method of carrying my invention into effect I employ a tool bar, carry-
ing a suitable cutting tool and arranged with its axis approximately coincident

page_text: with the centre of the bearing to be operated on, which is clamped to the frame
of the machine. The tool bar is caused to move longitudinally, and also to rotate
on its axis by suitable gearing actuated from a handle, and the tool, being pre-
sented to the work by a movement across the axis of the bar, cuts the groove.
Referring to the accompanying drawings in which similar letters indicato
similar parts:-
Fig. I is a side elevation and part section on line X X Fig. 2.
Fig. 2 is an end elevation.
Fig. 3 is a plan.
A tool bar a, fitted in bearings in the frame a¹º, carries at one end a tool a¹
secured in a slide block 2. The bar a is bored to receive a rod a, which has
mounted on one end a fork at, embracing the slide block a². The sides of the
fork are slotted at a³, and a pin on block a² enters the slot, consequently an end-
wise movement of the rod and fork will communicate a cross movement to the
slide block and tool. The nut 8 at the rear end of rod a³ is prevented from
moving endwise by the fork a fitting in the eccentric sleeve a
A half turn
of eccentric sleeve will result in a motion of the rod and tool block, and effect
a quick withdrawal or return of the tool after each cut. The feed outwards of
the tool during each cut is obtained by revolving the nut.
The rear end of the tool bar a is revolubly mounted in the square sleeve b,
sliding in the frame a¹0, but is prevented from moving endwise. Movement is
communicated to sleeve b by gears 61, 62 and 3 from the handle 4.
An exten-
sion of the shaft 65 caries a bevel gear 66 giving motion to gear and backshaft b.
At the front end of this shaft is keyed a pinion 38 giving motion through a set
of change wheels 69 mounted on a quadrant of ordinary construction, and
arranged to allow of the ratio of gearing being easily changed.
One of the gear wheels of change gearing actuates the larger gear 10 and
through the feather the tool bar a.
It will be evident that at rotation of the handle will produce a spiral motion
of the point of the tool, since two trains of gears are actuated, one giving rota-
tion and the other longitudinal movement.
The pitch of the spiral may be changed by interposing a different set of change
gears at or a straight groove may be cut by removing the change wheels 1º,
when the tool bar a will receive a longitudinal motion only through the
gears 1, 2 and 63.
I may employ a reversing motion of ordinary construction in place of the
pair of bevel wheels 66 and 67 to obtain a right or left hand spiral, and I may
interpose a clutch between the aforesaid bevel gears and the aforesaid change
gears in order that the spiral path of the tool may be made to commence at a
given point on the bearing to be grooved.
The knee is bolted to the frame 10, and may be raised or lowered to admit
pieces of various sizes, and may be depressed so as to bring the centre of the
piece being operated upon below or above the axis of the tool bar, in order to
make the groove deeper in the centre to amount required. Suitable pieces may
be received in the V formed in the top surface of the knee and tee slots are
provided for holding work in position.
The knee may be raised and lowered by means of a screw and nut actuated
by a hand wheel and this motion may be used for clamping the work against a
fixed abutment.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
First. In a machine for cutting oil grooves in bearings, plummer blocks and
the like, a tool bar carrying a cutting tool in combination with a rack bar and
gearing for giving a spiral motion of any pitch, substantially as described.
Second. In a machine for cutting oil grooves in bearings, plummer blocks and

page_text: the like, the combination with a tool bar of the means for quickly withdrawing
and also feeding forward the tool substantially as set forth.
Third. In a machine for cutting oil grooves in bearings, plummer blocks
and the like, means for clamping the bearing to be operated on by the use of
the screw and hand wheel substantially as described.
Fourth. In a machine for cutting oil grooves in bearings, plummer blocks and
the like, the arrangement of work support for producing an eccentricity in the
groove with respect to the bore of the bearing substantially as described.
Dated this Eleventh day of September 1900.
E. M. GRIFFITHS.