Improvements in or relating to Grinding Machines.
Year: 1895

page_text: Date of Application, 1st May, 1895-Accepted, 6th July, 1895
COMPLETE SPECIFICATION.
Improvements in or relating to Grinding Machines.
We, HARRY FRIEDERICHS, of Hainholz near Hanover in the Kingdom of
1'ussia, German Empire, and SIEGMUND SEELIGMANN, trading in the name of
S. Oppenheim & Co., of the same address, 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 relates to improvements in protecting devices applied to grinding-
machines especially such in which emery wheels are used-said devices being
designed for protecting the workman operating the machine. The protection is
especially directed against injuries and damage liable to be caused in cases where
the grinding stone splits or bursts and against the injurious effect of the dust caused
by the grinding operation.
The protecting devices as applied to grinding machines at the present time are in
many respects imperfect and do by no means meet all necessary requirements.
Neither in case of the bursting of the grinding discs nor during the operation under
normal conditions, do these protecting devices offer the workman such protection
that all danger is obviated; moreover very little attention, if any, has been paid,
(as regards the application of the usual safety-arrangement) to a systematic
removal of the emery and metallic dust produced by the grinding operation.
This improved protecting device is designed to do away with the aforementioned
disadvantages, and to remove the prevalent bias, according to which the lateral
walls of the protecting cap are placed as closely as possible to the emery wheel,
and according to this device the inner width of the cap h surrounding the said
wheel (see drawing) is increased to such a degree as to be a multiple of the width
of the emery wheel. Far from being defective this device offers on the contrary
the advantage that in case of the emery wheel being completely broken up or of
parts thereof separating and springing off owing to the fragments sliding over one
another, any bulging of the lateral portions of the protecting device and any
throwing off of the said fragments, is entirely obviated. The evil effect of the
concussions which originate in the interior of the widened hollow space is
unimportant as compared with the damage done by the blocking of the fragments
on to and above each other, where the cap is arranged closely adjacent to or
leaving a comparatively small free space between the wheel as is the case with
previous constructions of this kind.
As shown in the accompanying drawings Figs. 1 and 2 representing in side and
front elevation respectively a constructional example of the invention, the inner
sace of the sufficiently enlarged cap is closed in front by means of a slide s,
whereby any substances, injurious to health, are prevented from being thrown off.
Whereas the cap in connection with the said slide serves for the purpose of
rendering harmless any separating fragments of the wheel, the possibility of the
operator being injured by any fragments that may separate at the grinding space is
prevented by means of a protecting wall w, which is arranged in front of the body
of the operator, and can be adjusted up and down according to requirement.
When small pieces are to be ground they are passed between the aforesaid protecting
wall and the emery wheel-in which case the said wall may, so to speak, represent an
unchangeable construction.
In order to allow of the insertion of more or less extensive pieces to be ground,
the height of the protecting wall can be changed and adjusted by means of
alide

page_text: It is of great importance that below the emery-wheel as large a hollow space as
possible be provided in order to enable any separating fragments to readily gather
there. This hollow space may be constructed in various forms. The constructional
example shown in the accompanying drawing, represents the hollow space
immediately passing over into the cap h. Said hollow space may however also be
made to join the cavities of the posts or supporting frame of the machine, so that
the protecting device presents itself as the upper limitation of a box of iron or other
strong material.
The removal of dust caused by the grinding operation on the emery-wheel,
greatly injurious to the health (respirating organs and eyes) is effected by suitable
suction through the tubular communicating part t of the cap. This suction tube t
is preferably arranged so that the centrifugal force of the wheel promotes the easy
entrance of the dust.
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 :-
A protecting arrangement for grinding machines, more especially grinding
machines with emery wheels the cap (h) of which, having a width which is a
multiple of that of the emery wheel, prevents the lateral walls from being pressed
outward or bulged by the blocking when the wheel has been damaged and which
cap in connection with a closing slide (s) renders any upwardly moving fragments
of the wheel harmless; while a protecting wall (w), arranged to be adjusted as
required protects the body of the operator and effects by means of a tubular piece (t)
communicating with the cap a systematic removal of the emery and metallic dust
by suction.
Dated this 1st day of May 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.