IMPROVEMENTS IN FRICTION COUPLINGS FOR SHAFTS, PULLIES AND TOOTHED WHEELS
Year: 1882

page_text: LETTERS PATENT to Friedrich Carl Glaser of Berlin in the Kingdom of
Prussia and Empire of Germany, Engineer and Patent Solicitor for an
Invention of "IMPROVEMENTS IN FRICTION COUPLINGS FOR SHAFTS, PULLIES
AND TOOTHED WHEELS A communication made to him by Franz Braun
"
PROVISIONAL SPECIFICATION left by the said Friedrich Carl Glaser at the
Office of the Commissioners of Patents on the 26th August 1882.
FRIEDRICH CARL GLASER of Berlin in the Kingdom of Prussia and Empire of
Germany, Engineer and Patent Solicitor "IMPROVEMENTS IN FRICTION COUPLINGS
FOR SHAFTS, PULLIES AND TOOTHED WHEELS [A communication made to him
by Franz Braun and A. Stack fleth both of Berlin in the German Empire.]
This improved coupling can be put in and out of gear rapidly or slowly without
disturbance or shock of the moving parts, and causes no lateral pressure on the
bearings. The coupling consists of the following parts: In Fig. 1 the casing C is
fixed on the shaft B to be driven. On the driving shaft A is fixed the cross
shaped piece D which carries in slots the toothed wheels E E' fixed on screws xx¹
having right and left handed threads. The two arms D1 and D2 serve to guide
the break blocks P P in which are contained the screw nuts y y.
The casing F
is loose on the shaft A and has on its front side spiral ribs M (Fig. 6) and internally
the toothed ring N. The equal ended lever G is fixed on the shaft A and carries
at its ends the larger pinions I l' and the smaller pinions K K¹. The casing H
has inside the toothed ring O with which gear the pinions K K' while those I I'
gear with the internal toothed ring N of the casing F. The whole is prevented
from shifting laterally by the collar L secured by a setting screw to shaft A.
Figs. 7 and 8 shew the coupling with the breaks and w for throwing in and out
of gear.
The working of the coupling is as follows: If the coupling is to be put in gear
the casing His held stationary by the break block w (Figs. 7 and 8) As the
lever G is fixed on the shaft A the casing F will move in advance of the shaft A

page_text: to the same extent to which the casing H remains behind, as the proportions of
the toothed rings O and N to their pinions K K¹ and I I' are the same. As the
cross piece D makes the same number of revolutions as the shaft A the spiral M
will turn the two pinions E and E' in the direction towards the periphery of the
casing whereby the screws x and x will be rotated so as to cause the break
blocks P P¹ to be pressed against the casing C, thereby causing the shaft B to be
carried round with A. The break block w being released, the parts will remain in
this position until the part F is held stationary by the application of the break
block v, whereby the reverse action will take place causing the shafts to be
uncoupled. Fig. 1a shews the casing C of the above described apparatus fixed or
formed directly on the boss of a pulley loose on its shaft..

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Friedrich Carl Glaser in the Great Seal Patent Office on the
23rd February 1883.
FRIEDRICH CARL GLASER, of Berlin, in the Kingdom of Prussia, and Empire
of Germany, Engineer and Patent Solicitor, "IMPROVEMENTS IN FRICTION
COUPLINGS FOR SHAFTS, PULLIES, AND TOOTHED WHEELS," A communication to
him by Franz Braun and A. Stackfleth, both of Berlin, in the German Empire
This invention has for its object to construct a coupling which can be put in
and out of action at will either slowly or quickly, and without causing any
stoppage of work or lateral pressure on the bearings.
In describing the invention reference will be had to the accompanying drawings,
of which Fig. 1 represents an axial section of a shaft coupling embodying this
invention, while the upper half of Fig. 2 is a cross-section along line c―d, of Fig. 1,
the lower half of Fig. 2 a cross-section along line e-f, and Fig. 3 a cross-section
along line a-b of Fig. 1.
The coupling is constructed as follows:
On the driving shaft A is fastened (with key, or groove and feather) a carrier D
receiving in its arms D' and D the tooth wheels E and E' which are fastened on
the axles and x provided at the extremities with right and left-hand screw-
threads as shown.
Two arms D³ and D forming part of the carrier D serve to guide the brake-
blocks P and P in which are secured the 4 screw-nuts y, y, y, y, corresponding
with the screw-threaded extremities of and x.
Mounted loose on the axle A is also a disc F having on its face a spiral M as
shown by Fig. 4 which represents a front view of the said disc, while to the
opposite side is cast an internally toothed flange N.
.
A lever G is also fastened on the shaft A, which lever carries at its extremity
the large tooth-wheel F and the small tooth-wheel K mounted on the same axle.
A flanged disc H mounted loose on the shaft A has on its inside a toothed hub
or boss into which gears the tooth wheel K.
Above the two flanged discs F and H, and secured to some convenient point of
support are the brakes v and wadapted to be set in and out of action, when
desired.
The collar L serves to secure the coupling against lateral displacement.
On the driven shaft B is fastened a coupling-box or disc C provided with a
flange so as to partly enclose the carrier D.
For coupling the two shafts together while A is in motion, it is sufficient to
arrest the flanged disc H by means of the brake w.
As the lever G is fastened to the shaft A, the flanged disc F will run in
advance of the shaft A by the same amount, by which the disc H remains
behind, because the ratio between the number of teeth of the wheel or boss O to
that of its pinion K is the same as the ratio between the number of teeth of the
flange N and that of its pinion F.
Now, because the carrier D makes the same number of revolutions as the shaft A,
the spiral M which runs faster than A, causes the tooth wheels E and E¹ to turn
outward from the point of application (that is from the tooth which is situated
in the groove between two adjoining convolutions of the spiral) whereby the
screwed ends of the axle x and x are turned in their respective nuts y and the
latter together with the corresponding brake-blocks P and P' are caused to move
outward from the centre until the brake-blocks come in contact with the flange

page_text: of the disc C, thereby turning the latter together with the shaft B, on which it
is mounted.
Subsequently the brake w is released, and the coupling will remain in this
position until the flanged disc F is arrested by applying the brake v, whereby
the spiral M is turned the opposite way, so as to release the block P, P¹ and
consequently break the connection between the shaft B and the shift A.
It will be seen that the coupling has neither disengaging forks nor shifting
rails nor any parts similarly exposel to wear and tear, and that it can be worked
with ease and safety.
CLAIMS
1. A cylindrical friction coupling having the following peculiar features of
construction:
Inside the coupling-box C is a carrier D fixed to the driving-shaft A and having
arms D, and D, carrying the toothed wheels E and E' fixel on the spindles x
and a, each of which is provided with a right and left screw-thread, while the
arms D, and D, serve to guide the brake-blocks P and P' which receive the screw-
nuts y, y,, Y.
The wheels E and E¹ gear into the spiral M cast or fixed to the
front of the loose disc F provided with an internally toothed flange N. The disc F
abuts against a loose box or disc H enclosing the externally toothed hub or ring O;
and the discs F and H enclose also a lever G fixed to the shaft A and carrying at
its extremity the tooth wheels J and K, of which J gears into the internally toothed
flange N, and K into the externally toothed ring or hub O. Outside the dises F
and H there are brakes v and w, arranged to engage and disengage the coupling.
2. A cylindrical friction-coupling, substantially as described and illustrated.
In witness whereof I the said Friedrich Carl Glaser have hereunto set my
hand and seal this seventeenth day of February A.D. 1883.