Improvements in Apparatus for Engaging and Disengaging Driving Belts, Bands, or Straps.
Year: 1895

page_text: Date of Application, 10th June, 1895
Complete Specification Left, 9th Mar., 1896-Accepted, 18th Apr., 1896
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Engaging and Disengaging Driving
Belts, Bands, or Straps.
I, FREDERICK WILLIAM GOLBY, of 36, Chancery Lane, in the Administrative
County of London, Patent Agent do hereby declare the nature of this invention
as communicated to me by Henri Charles Armand Florimond Leneveu, of
115 Avenue de Neuilly, à Neuilly sur Seine, France, a Captain of the Engineers
on the Retired List, to be as follows:-
This invention relates to apparatus for engaging and disengaging driving belts,
bands or straps from their pulleys.
The apparatus comprises a carriage having two pressure rollers, the carriage
being caused to travel in a given path by a lever, crank, rack and cog-wheel or
other means, operated by hand or power.
The apparatus is so situated that one of its pressure rollers is on the inside and
the other on the outside of the belt, band or strap, against which they are caused
respectively to bear by the travel of. the carriage.
In the disengaged position the band is drawn entirely out of contact with the..
driving-pulley consequently there is no friction on the band in the disengaged.
position. When carrying the band to the engaged position the travel of the
carriage is such that the band is caused to encircle the greater part of the periphery
of the driving pulley, whereby a sure grip is obtained and the belt is not likely to
slip on the pulleys.
Dated this 10th day of June 1895.
F. W. GOLBY,
36, Chancery Lane, London, W.C.
Improvements in Apparatus for Engaging and Disengaging Driving
Belts, Bands, or Straps.
I, FREDERICK WILLIAM GOLBY, of 36 Chancery Lane in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention and
in what manner the same is to be performed, as communicated to me by Henri
Charles Armand Florimond Leneveu, of 115 Avenue de Neuilly, Neuilly sur
Seine, France, a Retired Captain of Engineers, to be particularly described and
ascertained in and by the following statement :-
This invention relates to apparatus for engaging and disengaging driving belts
bands or straps from their pulleys. The principle of the apparatus is to apply the
belting or rope to the driving pulley for engagement therewith by means of a
pressure roller which is applied in such a manner as to cause the belting or rope
to encircle a great part of the circumference of the driving pulley, and for
disengagement to remove the belting or rope by means of one or several disengaging
rollers.
The engaging and the disengaging pressure rollers are mounted on a common or
on separate frames and act together or independently of each other.

page_text: The engagement is effected by advancing the engaging roller or drum and by
applying it to the belting or cable so as to cause it to cover a large portion of the
circumference of the driving pulley, the disengagement on the contrary is effected
by withdrawing the engaging roller or drum until the belting or rope lies on one
of the disengaging rollers or drums which removes it from the driving pulley.
Pressure rollers have already been employed where but little power is transmitted,
but such pressure rollers have been used either for augmenting the tension of the
belting, which is mounted in the ordinary manner, so as to prevent its slipping, or
to allow the movement to continue by obtaining the running by the tension of the
belting without taking into account the value of the arc developed, or to stop the
machine by relaxing the belting till it has no longer the sufficient tension to run,
the driving pulley continuing to slide in the belting and causing harmful friction.
Such pressure rollers however do not attain the object attained by the apparatus
which forms the subject of this invention, that is to say, to engage the strongest
or weakest power during the movement, or at a standstill, rapidly or progressively,
without shock, and at all speeds by giving only the minimum of tension necessary
for the resistance to be overcome and proportioning continually the tension to the
resistance, and to disengage rapidly or very slowly as desired by causing all contact
with the driving pulley to cease.
The accompanying drawing represents two of the principal applications of the
invention.
Fig. 1 shews an arrangement in which the tension is produced in a straight line.
The apparatus is in a state of engagement; and Fig. 2 shews the same arrangement
representing the apparatus in a state of disengagement;
Fig. 3 shews an arrangement in which the tension is produced in a curved line
and represents the apparatus in an engaged position; and Fig. 4 shews the same
arrangement with the apparatus in a state of disengagement.
M is the driving axle, P the driving pulley, t the driven axle, and p the driven
pulley. In Fig. 1, E is the frame with corresponding sides in which lie the
engaging and disengaging rollers or drums G and R. This frame E is moveable
and slides in another fixed frame not shown in the drawing. The two sides of the
moveable frame E are connected together by cross bars at the points B, E, and K.
On one of the sides of the frame is fixed a rack gearing with a pinion wheel r
fixed to an independent immoveable support. On the axle of the pinion wheel r is
supported a pulley wheel which is put in motion by means of a crank or by means
of a belt or chain.
As aforesaid Fig. 1 represents the apparatus in a state of engagement. The
engaging roller G. is advanced and presses on the belting whilst applying it to the
driving pulley P; the belting being stretched causes the running of the axle t.
By turning the cog wheel r in the proper direction the tension of the belting is
reduced, and by continuing the rotation the tension ceases and the belting slackens.
The disengaging roller R finally removes the latter from its natural position until
it takes up the position shown in Fig. 2. In this position it has no longer any
contact with the driving pulley, so that a complete disengagement is effected. To
engage, the operation is reversed.
In Figs. 3 and 4 the frame supporting the rollers G and R is marked S. The
frame S does not slide in a straight line in a fixed frame but turns on a centre S¹.
S³ is a fixed segment serving to support one of the arms S2 of the frame either in
the engaged or disengaged position.
The advantages of the apparatus are simplicity of construction, easy and
progressive engagement the duration of which can be prolonged as much as
desired, engagement and disengagement whilst in motion at all speeds, immovable
position of the belting after the disengagement, tension of the belting regulated at
will proportionate to the power to be transmitted to economise the power, transmission
of considerably higher power with pulleys. of given size in consequence of a greater
contact of the belting with the driving pulley, &c.

page_text: 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 :-
An engaging and disengaging apparatus for beltings, cables or ropes by means.
of engaging and disengaging rollers the arrangement and action of which permits
of the stoppage of the driven pulley to be effected rapidly or slowly as desired by
the complete removal of the belting or cables from the driving pulley substantially
as described.
L 1900
F. W. GOLBY,
36 Chancery Lane, London, W.C.