An Improved Automatic Dental Hammer.
Year: 1894

page_text: Date of Application, 19th Mar., 1891
Complete Speci cation Left, 19th Dec.. 1894-Accepted, 19th Mar., 1895
PROVISIONAL SPECIFICATION.
An Improved Automatic Dental Hammer.
I, SAMUEL HENRY ADAMS, Hydraulic Engineer of Peaseholm Green York
do hereby declare the nature of this invention to be as follows :—
I prefer to make this apparatus of or similar to a short length of tube, within
this tube is a piston. This piston is actuated backwards and forwards by suitable
mechanism, motion to which may be imparted by the present rotary apparatus now
used for drilling out teeth and other similar purposes. To govern the force of
strike of my piston I arrange suitable air cushions and inlet and outlet valves as
required and the force of my piston is brought to bear upon the chisel or other
tool by coupling it to or placing it in contact with this piston.
March 19th 1891
SAMUEL HENRY ADAMS Hydraulic Engineer Peaseholm Green York and
Old Queen Street Westminster London 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 relates to improvements in dental hammers. I arrange within a
suitable holder a piston or pistons or haminers of the desired weight and contrive
that by the action of springs and the revolving motion of the apparatus or machine
to which it is connected that these hammers are actuated backwards and forwards
and striking on the tool or tool holder give the required movement to the tool
backwards or forwards or both as desired. Reference to my drawings will explain
my invention.
Fig. 1. shews the dental hammer complete with A the tool holder B. the tool-
held in place by screw C. D is the hollow tube in which my various parts are
arranged. E is the attachment to the dentist's rotary machine. One of my
bammers strikes the tool holder backward and the other strikes it in the contrary
direction. In Fig. 2 my hammers are marked K and K respectively. I prefer
to form the revolving attachment E at its extremity El as a square spindle and
this square fitting into a corresponding opening at M will cause M and the piston
or hammer K of which M is a part to revolve at the other extreme of K and
preferably at opposite points I insert pins O. O. and in the hammer K' I form
hollows immediately opposite these points into which these pins pass-but of
such a form that they may have a certain amount of lateral movement-but that
they cannot be withdrawn entirely. I thus impart the revolving movement of K.
to K. And now in order to convert this into an oscillating movement, I form the
collar Q-which revolves freely upon my hammer-the collar V is however
attached to this hammer and engages by its ratchet a similar ratchet on Q, thus
revolving in the same direction, at the other edge of my collar Q I form a
sloping travel. Now I fix another collar R in contact with Q. This collar R is

page_text: held in place by screws S. S. and cannot revolve-it has a lug formed upon its
edge and thus when my hammer K' and the collar Q revolve-the latter will be
depressed when in contact with lug R', and will when the moment of this contact
is passed be driven suddenly forward by the force of spiral spring G. and striking
my tool holder at B. B. a sharp blow-the tool will thus be driven forward until
again depressed by the revolving collar Q. and the lug R. To acentuate this
return I duplicate my mechanism the hammer K. striking the other head of my
tool holder at K. K. I thus get a smart blow delivered in turn at either end of
the tool holder at N. N. are light spiral springs which are used to keep the tool
holder in the position required-to receive the blow of my hammer. The action is
thus continuous. My object in providing the ratchet is to avoid the danger of
breakage if as might happen the apparatus should by accident be caused to revolve
in the contrary direction in which case now the two collars Q and V would at once
become disengaged.
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
1. The use in a tube of a piston or hammer or hammers which shall be released
by the revolving movement of a portion of the tool or holder-by a spring-for
the purpose of a dental hammer.
2. The use of the collar Qor surface or angle similarly cut for the purpose
of depressing a spring which spring when liberated shall strike a hammer for the
purpose of giving a blow to the tool or tool holder, for use as a dental hammer.
3. The method of imparting backward and forward movement to a dental
hammer as shewn & described.
4. All the special parts shewn by my drawings and apparatus substantially the
same and for the same purpose as herein described.
Dated this 18th day of December 1894.
SAMUEL HENRY ADAMS.