Improvements in Friction Clutches for Transmitting Rotary Motion.
Year: 1897

page_text: Date of Application, 20th Dec., 1897
Complete Specification Left, 20th Sept., 1898-Accepted, 22nd Oct., 1898
Improvements in Friction Clutches for Transmitting Rotary
Motion.
We, HUGH WATSON MACKENZIE, 4, Lily Terrace, Edinburgh, and ALEXANDER
OGILVIE ROBERTSON, 11, Rillbank Terrace, Edinburgh, both in Midlothian, Engineers,
do hereby declare the nature of this invention to be as follows:→
This invention consists of improvements in friction clutches for transmitting
rotary motion and has for its object to simplify the construction and increase the
efficiency of such clutches.
In the accompanying sheet of drawings.
Fig. 1 is a longitudinal section of the clutch as a coupling for transmitting rotary
motion from one shaft to another.
Fig. 2 is an end view of the same.
Fig. 3 is a plan of the same.
Fig. 4 is a longitudinal section of the clutch as applied to a pulley.
Fig. 5 is a plan of the copper dises made in halves for the purpose of renewal.
a is the shaft on which is keyed a half coupling b, c is another shaft on which is
keyed the sleeve d, on one end of the sleeve d is formed a solid collar e the other end
is screwed, on said screw is a nut f said nut being adjustable and fixed in position by
means of a pad g and a key h also on said sleeve d is an inner nut j said nut j being
free to turn on the sleeve d and is operated by means of slots q, r in ring k and
pins l, m fixed in nuts fj. Movement along the clutch in line of the shaft being
given to ring by means of a lever a and pads t or other suitable means.
k
Fixed to coupling e and loose on sleeve d is a flat ring n, also on each side of n
are copper discs or washers o, p.
Fig. 4, is a shaft on which is keyed a sleeve d¹ the end of the sleeve is formed
with a solid collar e¹ the other end of the sleeve is screwed, on said screw is a nut f
said nut being adjustable and fixed in position by means a pad g' and key h¹ also
on sleeve ¹ is an inner nut j¹ said nut being free to turn on the sleeve and is operated
by means of slots in ring and pins in nuts f³, j¹ same as shown in Figs. 1 and 3.
Movement along the clutch in line of the shaft being given to ring ¹ by means of
the toothed quadrant u¹ and rings or teeth v₁ formed on ring k¹. Loose on the
sleeve d¹ is a pulley n¹, on each side of the pulley boss are copper discs o¹ p¹.
The following description explains the action of the clutch when used as a coupling
as shown in Figs. 1, 2 & 3.
To transmit the motion from one shaft to the other the flat ring n attached to the
coupling b is gripped by the copper discs o, p, between the solid collar e of sleeve d
and the loose nut j.
Said nut being tightened up by means of the slots q, r in ring k and pins 1 m; the
pinis attached to the fixed nut f, the pin m is attached to the loose inner nut j,
the ring k being moved along the clutch in line of the shaft by means of the lever s
or other suitable means. The helical slot r guided by the pin on the fixed nut f
turns the ring round the clutch, and the helical slot q being formed in the ring k in
the opposite direction turns the nut j by means of the pin m thus tightening the

page_text: nut j and gripping the flat ring n between the copper dises o, p against the solid
collar e thus locking the shafts together and conveying the motion of shaft c to shaft
a or a to c.
It is clear that the clutch can be used for transmitting rotary motion by means of
spur or other gearing or a pulley as shown in Fig. 4.
The ring being moved along the clutch in line of the shaft by means of the
toothed quadrant ul gearing into the rings or teeth von ring thus in the manner
described in clutch coupling gripping the boss of the wheel or pulley between the
copper discs o p against the solid collar el and the nut j and conveying the motion
of the shaft a¹ to the pulley a¹ or the pulley to the shaft.
Dated this 17th day of December 1897.
HUGH W. MACKENZIE,
A. O. ROBERTSON.
COMPLETE SPECIFICATION.
Improvements in Friction Clutches for Transmitting Rotary
Motion.
We, HUGH WATSON MACKENZIE, 4, Lily Terrace, Edinburgh, and ALEXANDER
OGILVIE ROBERTSON, 11, Rillbank Terrace, Edinburgh, both in Midlothian,
Engineers, 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:-
This invention consists of improvements in friction clutches for transmitting
rotary motion and has for its objects to simplify the construction and increase the
efficiency of such clutches.
In the sheet of drawings left with the provisional specification-
Fig. 1 is a longitudinal section of the clutch as a coupling for transmitting rotary
motion from one shaft to another.
Fig. 2 is an end view of the same.
Fig. 3 is a plan of the same.
Fig. 4 is a longitudinal section of the clutch as applied to a pulley.
Fig. 5 is a plan of the copper discs made in halves for the purpose of renewal.
a is the shaft on which is keyed a half coupling b, c is another shaft on which
is keyed the sleeve d, on one end of the sleeve d is formed a solid collar, e, the
other end is screwed, on said screw is a nut f said nut being adjustable and fixed
in position by means of a pad g and a key h also on said sleeve d is an inner
nut said nut being free to turn on the sleeve and is operated by means of
slots in ring k and pins m fixed in nuts f j. Movement along the clutch in
line of the shaft being given to ring k by means of a levers and pad t or other
suitable means. Fixed to coupling b and loose on sleeve d is a flat ring n, also
on each side of n are copper discs or washers o p. Fig. 4 is a shaft on which is
keyed a sleeve d¹ the end of the sleeve is formed with a solid collar e the other
end of the sleeve is screwed, on said screw is a nut f said nut being adjustable
and fixed in position by means of a pad g¹ and key also on sleeve d¹ is an inner
nut said nut being free to turn on the sleeve and is operated by mean of slots in
ring and pins in nuts f¹¹ same as shown is Figs. 1 & 3.
Movement along the clutch in line of the shaft being given to ring /¹ by means
of the toothed quadrant u¹ and rings or teeth formed on ring k¹. Loose on the
sleeve is pulley n¹ on each side of the pulley boss are copper discs of p¹.
The following description explains the action of the clutch when used as coupling
as shown in Figs. 1, 2 & 3.

page_text: To transmit the motion from one shaft to the other the flat ring n attached to the
coupling b is gripped by the copper discs o p between the solid collar e of sleeve d
and the loose nut j. Said nut being tightened up by means of the slots q r in ring k
and pins lm, the pin is attached to the fixed nut f the pin m is attached to the
loose inner nut j, the ring being moved along the clutch in line of the shaft by
means of lever s or other suitable means. The helical slot r guided by the pin / on
the fixed nut f turns the ring round the clutch and the helical slot q being formed in
the ring in the opposite direction turns the nut j by means of the pin m thus
tightening the nut j and gripping the flat ring n between the copper discs o p against
the solid collar e thus locking the shafts together and conveying the motion of shaft c
to shaft a or a to c.
It is clear the clutch can be used for transmitting rotary motion by means of
spur or other gearing or a pulley as shown in Fig. 4. The ring being moved along
the clutch in line of shaft by means of the toothed quadrant gearing into the
rings or teeth von ring k¹ thus in the manner described in clutch coupling, gripping
the boss of the wheel or pulley between the copper discs o¹ pl against the solid collar e¹
and the nut j and conveying the motion of the shaft a¹ to the pulley n¹ or the pulley
to the shaft.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:-
1. In friction clutches for transmitting rotary motion, the ring k in combination
with the nuts and j as herein described, and illustrated in the drawings left with
the provisional specification.
2. In friction clutches for transmitting rotary motion, the sleeve d in combination
with the nuts f and jas herein described, and illustrated in the drawings left with
the provisional specification.
3. The general construction, arrangement and combination of parts, in our improve-
ments in friction clutches for transmitting rotary motion as herein described and
as illustrated in the drawings left with the provisional specification.
Dated this 17th day of September 1898.
HUGH W. MACKENZIE,
A. O. ROBERTSON.