IMPROVED TOOL STOCK OR BRACE
Year: 1885

page_text: I GEORGE EDWARD SMART of Belvedere House Tunbridge Wells in the County
of Kent Gentleman do hereby declare the nature of my invention for "IMPROVED
TOOL STOCK OR BRACE" to be as follows:-
The object of this invention is to provide a stock or holder for "brace-bits"
which will impart the revolving motion to the "bit" by simple pressure instead of
being turned by the hand as in the ordinary brace.
The bit may be secured in the usual manner to a spindle which is formed into
or carries a bevel or other pinion which gears with one or more bevel or other
wheels that may be of larger diameter situated within the stock or handle and
connected with the spindle by a suitable swivel joint or secured so as to gear with
the pinion aforesaid.
Or a smaller wheel or wheels may be attached to a larger wheel or wheels-the
small wheel would then get more revolutions from the length of the rack which
would cause the larger wheel or wheels to impart a greater number of revolutions
to the spindle.
Lengthwise of the stock is one or more racks arranged to gear with the larger
wheel or wheels-the action being as follows:-
To commence the spindle drawn out and the bit placed in position and upon
pressure being put upon the stock it is forced down the spindle-As it moves the
rack turns the larger wheel which in turn drives the pinion and spindle at an
increased speed.
By means of a suitable loose collar and arms or equivalent device the spindle
may be held to its work while the stock is withdrawn; this will impart a reverse:
motion to the bit which may be utilized in withdrawing screws for instance..
If the wheel or pinion be provided with ratchet or clutch gear no movement need
result from the withdrawal of the stock.
Or a few cogs may be omitted at one or both ends of the racks so that by a turn
of the wrist they may be disconnected from the wheels, drawn up the length of the
spindle and be again connected with the wheels by another turn of the wrist.
It will be noticed that this instrument will be exceedingly handy for driving
screws and for drills gimblets and the like-Where many screws have to be driven
and withdrawn two instruments may be used; one arranged to drive the screws in
and the other to withdraw them by pressing on the stock-The stock can be
secured so as not to come off the spindle or it may be simply placed over it and

page_text: two stocks may be provided for one spindle so as to turn it in either direction
according to the work to be done.
This tool might be made very small for the use of dentists the collar with arms
might have two rings or equivalent attached to insert two fingers and the end of
the stock might have one in which to insert the thumb-the drilling could then be
performed with the fingers and thumb of one hand.
The spindle may be hollow and have a rod fixed in the top of the stock passing
down it to give steadiness.
I GEORGE EDWARD SMART of Belvedere House Tunbridge Wells in the County
of Kent Gentleman 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 :—
The object of this invention is to provide a stock or holder for "brace-bits'
which will impart the revolving motion to the "bit" by simple pressure instead
of being turned by the hand as in the ordinary brace.
. The bit may be secured in the usual manner to a spindle which is formed into
or carries a bevel or other pinion which gears with one or more bevel or other
wheels that may be of larger diameter situated within the stock or handle and
connected with the spindle by a suitable swivel joint or secured so as to gear with
the pinion aforesaid.
Or a smaller wheel or wheels may be attached to a larger wheel or wheels, the
small wheel would then get, revolutions from the length of the rack which would
cause the larger wheel or wheels to impart a greater number of revolutions to the
spindle.
Lengthwise of the stock is one or more racks arranged to gear with the larger
wheel, or wheels the action being as follows:-
To commence, the spindle is drawn out and the bit placed in position and upon
pressure being put upon the stock it is forced down the spindle. As it moves the
rack turns the larger wheel which in turn drives the pinion and spindle at an
increased speed. Or power may be obtained by substituting a small wheel in place
of the large, which gears into a large wheel on the spindle.
By means of a suitable loose collar and arms or equivalent device the spindle
may be held to its work while the stock is withdrawn; this will impart a reverse,
motion to the bit which may be utilised in withdrawing screws for instance.

page_text: If the wheel or pinion be provided with ratchet or clutch gear no movement need
result from the withdrawal of the stock.
Or a few cogs may be omitted at one or both ends of the racks so that by a turn
of the wrist they may be disconnected from the wheels, drawn up the length of the
spindle and be again connected with the wheels by another turn of the wrist.
It will be noticed that this instrument will be exceedingly handy for driving
screws and for drills, gimlets, and the like-Where many screws have to be driven
and withdrawn two instruments may be used; one arranged to drive the screws
in and the other to withdraw them by pressing on the stock. The stock can be
secured so as not to come off the spindle or it may be simply placed over it and
two stocks may be provided for one spindle so as to turn it in either direction
according to the work to be done.
This tool might be made very small for the use of dentists the collar with arms
might have two rings or equivalent attached to insert two fingers and the end of
the stock might have one in which to insert the thumb-the drilling could then
be performed with the fingers and thumb of one hand.
The spindle may be hollow and have a rod fixed in the top of the stock passing
down it to give steadiness.
Referring to the accompanying drawings Figure 1 is a longitudinal section of
a complete tool stock; Figure 2 an elevation; Figure 3, a cross-section at x x and
Figure 4 is a cross-section at y y.
Figures 5 and 5° are elevations of smaller instruments for use with one hand:
Similar letters of reference refer to like parts in all the figures:-
A is the holder or chuck for attaching the bits or drills to the stock this is made
in one with or fastened to a hollow or solid spindle B the opposite end of which
has a pair of bevel wheels C and C¹ securely attached thereto and mounted face to
face a short distance from each other. Between this pair of bevel wheels I place
a cross-piece or collar D within which B is free to revolve and having at each
end trunnions or axles D¹ D¹ which act as bearings for the bevel pinions EE,
which engage with the bevel wheels C or C¹ according to the direction of the
reciprocative movement of the tool-stock, thus producing a continuous or nearly
continuous rotary movement in one direction to the tool. On the outer faces of
the bevel pinions E EI form spur pinions F F which run in grooves G and gear
with the racks G¹ which form one side of each groove G in the casing H of the
tool stock. The casing H may be of any suitable shape but preferably circular in
cross section and is provided with lugs H¹ near each end. To one end of the casing
I attach any convenient handle J by means of the plate J¹ and screws J2 to the
tool stock casing. H. To the opposite end of the tool stock I attach a cap K by
means of the screws K' or other suitable means. On the cap K a boss K' may be
formed having a hole concentric with the tool stock, this hole serving as a guide
and bearing for the spindle B. Into the plate J¹ I screw or otherwise attach
a rod L which is concentric with and slides in the tubular spindle B. This rod L
serves both as a guide and means for steadying the spindle when the tool stock is
being used.
Near the tool holder A I place any convenient handle M which may be
removable having at its extremity a boss M¹ which may be extended so as to
serve instead of boss K¹ through which the spindle B revolves. On each face
of the boss I place a collar M² securely attached by screws or other means to the
spindle. B; these serve to keep the handle in position and permit of the rotary
movement of the spindle taking place.
Figures 5 and 5* are elevations of small tool stocks suitable for drilling holes or
other purposes with one hand.
The mechanism for producing rotary motion to the drill may be of a similar
character to that described above or the tool stock may remain in this instance
stationary the reciprocating motion being imparted to the tool by means of the
spindle B.
.

page_text: •
This instrument is held by any convenient holders preferably rings N N N¹
with which one or more fingers and thumb engage. The normal position of the
holder N is maintained in the extended position (as shown by dotted lines) by
means of a spiral or other spring placed inside the instrument. Thus it will be
observed that pressure only is required to produce rotary motion the extra power
which is required to compress the spring serving to produce a rotary motion in the
rotary or outward stroke if desired.
In describing this invention I have only selected two examples to illustrate how
the same may be carried into effect. Many variations however in the mechanical
means could be devised to produce various movements in the tool, for instance the
grooves in the casing could have a rack placed alternately on the respective fares,
this would produce alternate revolutions in the tool or the grooves might be made
continuous i.e. parallel to each other with semi-circular ends this would cause the
tool to be rotated continuously in one direction.
.
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. In a brace such as described the combination with a revolvable spindle such
as B carrying one or more wheels or pinions such as C C a loose cross piece or
collar D and wheels or pinions E F adapted to gear with C C¹ of a frame or casing
such as H having longitudinal racks G¹ adapted to gear with. F the whole
constructed and operating substantially as and for the purpose specified.
2. In a brace such as described the combination with a hollow revolvable
spindle B carrying wheels or pinions such as C C¹ and adapted to be revolved in
the manner specified of a rod L connected to and moving with the casing H
substantially as and for the purpose specified.
3. The complete brace substantially as specified and shown in Figures 1 to 4 of
the accompanying drawings.
4. The complete brace adapted to be operated by one hand constructed and
operating substantially as and for the purpose specified and shown in Figure 5 of
the accompanying drawings.
Dated this 2nd day of April 1886.