IMPROVEMENT IN KEY BOARD MUSICAL INSTRUMENTS
Year: 1884

page_text: I THOMAS CHARLES TURNER of 74 Kingsdown Parade Bristol Music Publisher
do hereby declare the nature of my invention for IMPROVEMENT IN KEY BOARD
MUSICAL INSTRUMENTS to be as follows:-
An improved key pin for the better adjustment, regulation, & tightening, of the
keys (touch) of Pianofortes, Harmoniums, American, & all kinds of reed or pipe
Organs viz: A key pin of any material, the upper part being oval & the lower
round, with the lower portion of round part screwed, to take a nut for screwing up
or down, so as to regulate the depth of touch. What I particularly claim as my
invention is the application of part oval, & part round key pins to key boards of
musical instruments, & the addition of a screwed portion for nut, to key pins, to
regulate the depth of touch.
Improvement in Key Board Musical Instruments.
I THOMAS CHARLES TURNER of 70 Kingsdown Parade Bristol Musical Publisher
do hereby declare the nature of my invention for IMPROVEMENT IN KEY BOARD
MUSICAL INSTRUMENTS and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
An improved key pin for the better regulation, adjustment & tightening of the
keys (touch) of all kinds of Pianofortes, Harmoniums, American, & pipe Orgaus,
& all other key board Musical Instruments, digitorums & similar constructions,

page_text: A key pin Fig. 1 of any material, the upper part A being oval & the lower
part B round with one portion C screwed to take a nut as a means of regulating
the depth of the touch of key board.
Fig. 2 is side view of portion of ordinary key showing in dotted lines position &
shape of front or guide hole & centre hole.
Fig. 3 Key pin in position.
4 Punch cloth.
"
5 Nut on Pin.
"
"
6 Portion of Key frame.
Letter A is oval part of pin.
39"
B round part of pin with one portion C screwed for nut to turn on.
Fig. 2 is top view of portion of Key showing shape & upper & lower portions
of centre hole the latter in dotted lines with key pin X in position.
The oval A portion of pin passes.through lower or round portion of centre hole
into upper or square portion-which portion of hole being less in diameter than
lower or round portion, will not admit of the pin being turned round, therefore
when the key becomes loose the slightest turn of pin either to left or right, causes
-bevelled or oval edges of pin to contact with sides of square or upper part of centre
hole & thus key is immediately tightened as in Fig. 2A X.
Another feature of my invention consists in the addition of a screwed thread &
nut to key pin, which enables the touch to be shallowed or deepened by merely
turning nut up or down, & saves the necessity of removal of Key from frame, & the
use of extra punch cloths or planing for regulating & levelling the touch of Key
boards.
Having now particularly described & ascertained the nature of my said
invention, & in what manner the same is to be performed I declare that what
I claim is
1stly The application of part oval & part round key pins for centre holes, & other
holes of Key of every description of key board Musical Instruments, Digitorums,
& similar constructions.
2ndly The addition of a screwed thread & nut to key pins of any description
& shape for regulating & levelling the touch of all key boards & similar
constructions.
Dated this 12th day of September 1885.