Improvements in Dental Pluggers or Mallets.
Year: 1898

page_text: Improvements in Dental Pluggers or Mallets.
I, FRANK LUTHER MARSHALL, of 74, Boylston Street, in the City of Boston and
State of Massachusetts, United States of America, Dentist, do hereby declare the
nature of this invention, to be as follows:-
My invention relates to certain improvements in dental pluggers or mallets, the
object being to produce an adjustable angular plugger or mallet, and the invention
consists in a novel construction, arrangement and combination of parts comprising
the plugger as hereinafter set forth.
Referring to the accompanying drawings,
Figure represents a front view of a dental plugger or mallet embodying my
invention.
Figure 2 is a side view of the same.
Figure 3 is a longitudinal vertical section of the same showing the spherical blocks
in contact as when imparting a blow.
Figure 3 is a longitudinal vertical section drawn to an enlarged scale and showing
the plugger point in a vertical position.
Figure 4 is a similar view showing the plugger point set at right angles; and
Figure 5 is a similar view showing the plugger point set at an angle of 45°.
Figures 6 to 20 are detail views of the various parts. A, represents the lower and
B, the upper portion of the outer shell or casing of the plugger or mallet;
the upper
end a, of the portion A, and the lower end b, of the portion B, are each formed on a
angle of 45° to the main portion, the portion a being formed with a small flange or
lip a¹, and the portion b, with a screw thread. These two parts are connected together
by a coupling ring C, the upper and lower edges of which are formed with teeth for
the purposes hereinafter described.
It will be seen that by this arrangement the part B, can be turned to any desired
angle in relation to the part A.
In order to prevent the portion B, from being accidentally unscrewed I secure to the
portion B, a small spring D, the free end of which takes into the teeth formed on the
upper side of the ring C, and in order to securely hold the portion B, in position, after
it has been set, a slide E, having teeth at its upper end, is let into a groove e, forming
in one side of the casing A, which slide is attached to a sliding split ring F, having
its outer surface roughened so that it can be easily adjusted by the operator when
desired. The teeth of the slide E, when in contact with the teeth on the under side
of the ring C, securely locks the two parts A, and B, together, the split ring F, firmly
gripping the casing A, so that it cannot shift of its own accord.
The upper end of the casing B, is formed with an internal screw thread into
which is screwed a socket or receiver G, for the plugger holder H; this socket G,
is formed with a hole in its bottom through which passes the reduced end h, of
the plugger holder H, and to the bottom of said end h, is secured a block I,
the lower end of which is of spherical form, as shown, and between the upper
end of the block I, and the underside of the socket G, is interposed a spiral
spring J, thus the plugger holder H, is held down in its normal position,

page_text: The said plugger holder H, is hollow and formed with an internal screw thread
into which is screwed the end of the plugger tool K. A small screw L, is inserted
in one side of the plugger holder H, which screw projects into and works in a
slot, formed in the socket G, so as to cause the plugger tool to work in a
straight line and also to prevent the plugger holder turning when the plugger
tool is being inserted or removed.
The casing A, is at its lower end formed with an internal screw thread into
which is screwed the blow regulator consisting of a tubular piece M, which is
formed with an annular recess m, into which projects the end of a screw N, that passes
through the casing A, so that after the tubular piece M, has been adjusted said screw
will hold it in position so that it cannot work loose. The upper portion of the tubular
piece is also formed with two slots m¹, diametrically opposite each other in which
works a pin P, that passes through a rod Q, that is free to slid in the tubular piece M.
Upon the upper end of this rod Q, is secured a block R, the upper end of which is of
spherical form, as shown. The lower end of the rod Q, is screw threaded and fitted
with a nut R¹, between which and the lower end of the tubular piece M, is interposed
a spiral spring S, so that the rod Q, is held normally in its lowered position. The
rod Q, may be operated to impart the blow by pneumatic, electric, mechanical or
manual power.
The operation is as follows:
'
The casing B, is first set to the required angle in relation to the casing A, the
length of travel of the rod Q, for imparting a blow to the block I, on holder H,
carrying the plugger or point K, is then set by adjusting the regulator or tubular
piece M, in the casing A. If long blows are desired, then the regulator or tubular
piece M, is screwed in, but if short blows are desired then the regulator or
tubular piece M, is screwed out, the length of the stroke of the plugger being the
distance the block I, is pushed forward by the block R; thus if the regulator or
tubular piece M, is adjusted as shown in Figures 3, 4 and 5, a blow of medium length
will be given. It will be seen that by turning the regulator or tubular piece M, up
into the casing A, a long stroke will be produced, and by turning said regulator or
tubular piece M, down a shorter stroke will be produced.
When the rod Q, is operated or forced forward the spherical end R, comes into
contact with the spherical end I, of the tool carrier so as to impart a blow thereto and by
reason of the two sperical blocks R, I, the blow will be imparted equally at whatever
angle the portions A, B, may be set, the length of the stroke being adjusted by the
position, of the regulator or tubular piece M, in the casing A, as before described.
It will be seen that the casing of a dental plugger or mallet constructed as
described can be readily adjusted to any required angle, and the length of the blow
be easily adjusted.
COME LEIE DIECIFICATION.
Improvements in Dental Pluggers or Mallets.
I, FRANK LUTHER MARSHALL, of 74, Boylston Street, in the City of Boston and
State of Massachusetts, United States of America, Dentist, 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 certain improvements in dental pluggers or mallets, the
object being to produce an adjustable angular plugger or mallet, and the invention

page_text: consists in a novel construction, arrangement and combination of parts comprising the
plugger as hereinafter set forth.
Referring to the drawings left with my Provisional Specification.
Figure represents a front view of a dental plugger or mallet embodying my
invention.
1
Figure 2 is a side view of the same.
Figure 3 is a longitudinal vertical section of the same showing the spherical blocks
in contact as when imparting a blow.
Figure 3 is a longitudinal vertical section drawn to an enlarged scale and showing
the plugger point in a vertical position.
Figure 4 is a similar view showing the plugger point set at right angles; and
Figure 5 is a similar view showing the plugger point set at an angle of 45°.
Figures 6 to 20 are detail views of the various parts.
A, represents the lower and B, the upper portion of the outer shell or casing of the
plugger or mallet; the upper end a, of the portion A, and the lower end b, of the
portion B, are each formed on an angle of 45° to the main portion, the portion.a being
formed with a small flange or lip al, and the portion b, with a screw thread. These
two parts are connected together by a coupling ring C, the upper and lower edges of
which are formed with teeth for the purposes hereinafter described.
It will be seen that by this arrangement the part B, can be turned to any desired
angle in relation to the part A.
In order to prevent the portion B, from being accidentally unscrewed I secure to
the portion B, a small spring D, the free end of which takes into the teeth formed
on the upper side of the ring C, in order to securely hold the portion B, in position,
after it has been set, a slide E, having teeth at its upper end, is let into a groove.e,
forming in one side of the casing A, which slide is attached to a sliding split ring F,
having its outer surface roughened so that it can be easily adjusted by the operator
when desired. The teeth of the slide, E, when in contact with the teeth on the
under side of the ring C, securely locks the two parts A and B, together, the split
ring F, firmly gripping the casing A, so that it cannot shift of its own accord.
The upper end of the casing B, is formed with an internal screw thread into which
is screwed a socket or receiver G, for the plugger holder H; this socket G, is formed
with a hole in its bottom through which passes the reduced end h, of the plugger
holder H, and to the bottom of said end h, is secured a block I, the lower end of
which is of spherical form, as shown, and between the upper end of the block I, and
the underside of the socket G, is interposed a spiral spring J, thus the plugger
holder H, is held down in its normal position. The said plugger holder H, is hollow.
and formed with an internal screw thread into which is screwed the end of the
plugger tool K.
A small screw L, is inserted in one side of the plugger holder H,,
which screw projects and works in a slot l, formed in the socket G, so as to cause the
plugger tool to work in a straight line and also to prevent the plugger holder turning
when the plugger tool is being inserted or removed.
The casing A is at its lower end formed with an internal screw thread into which
is screwed the blow regulator consisting of a tubular piece M, which is formed with
an annular recess m, into which projects the end of a screw N, that passes through the
casing A, so that after the tubular piece M, has been adjusted said screw will hold it
in position so that it cannot work loose. The upper portion of the tubular piece is
also formed with two slots m¹, diametrically opposite each other in which works a
pin P, that passes through a rod Q, that is free to slide in the tubular piece M. Upon
the upper end of this rod Q, is secured a block R, the upper end of which is of
spherical form, as shown. The lower end of the rod Q, is screw threaded and fitted
with a nut R', between which and the lower end of the tubular piece M, is interposed
a spiral spring S, so that the rod Q, is held normally in its lowered position. The
rod Q, may be operated to impart the blow by pneumatic, electric, mechanical or
manual power.
The operation is as follows:
The casing B, is first set to the required angle in relation to the casing A, the length of
i

page_text: travel of the rod Q, for imparting a blow to the block I, on holder H, carrying the
plugger or point K, is then set by adjusting the regulator or tubular piece M, in the
casing A.
If long blows are desired, then the regulator or tubular piece M, is screwed
in, but if short blows are desired then the regulator or tubular piece M, is screwed
out, the length of the stroke of the plugger being the distance the block I, is pushed
forward by the block R; thus if the regulator or tubular piece M, is adjusted as
shown in Figures 3, 4, and 5, a blow of medium length will be given. It will be
seen that by turning the regulator or tubular piece M, up into the casing A, a long
stroke will be produced, and by turning said regulator or tubular piece M, down a
shorter stroke will be produced.
When the rod Q, is operated or forced forward the spherical end R, comes into
contact with the spherical end I, of the tool carrier so as to impart a blow thereto
and by reason of the two spherical blocks R, I, the blow will be imparted equally at
whatever angle the portions A, B, may be set, the length of the stroke being adjusted
by the position of the regulator or tubular piece M, in the casing A, as before
described.
It will be seen that the casing of a dental plugger or mallet constructed as
described can be readily adjusted to any required angle, and the length of the blow
be easily adjusted.
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 :-
1. A dental plugger or mallet consisting of a two-part casing connected together
by an angularly disposed swivel joint whereby one part of the casing may be adjusted
to be parallel with or at any desired angle to the other part, a movable tool carrier in
the upper casing, a hemispherical block secured to the inner end of the carrier, a tool
secured in said carrier and moved therewith, a plunger rod in the lower casing, a
hemispherical block on the inner end thereof, the said hemispherical blocks of the
plunger and tool carrier being always in such relation that the forward movement of
the former brings the head of the same into striking contact with the head of the
latter, thereby imparting motion to the tool carrier and tool substantially as set
forth.
2. In a dental plugger or mallet a casing made in two parts connected together by
an angularly disposed swivel joint, a tool carrier in the upper portion of the casing, a
hemispherical block secured to the inner end of the tool carrier, a rod in the lower
portion of the casing, a hemispherical block on the upper end of said rod whereby a
blow is imparted by the inner hemispherical block to the outer one when said rod is
operated, in combination with means for regulating the force of the blow substantially
as set forth.
3. In a dental plugger or mallet consisting of an upper and lower casing connected
together by an angularly disposed swivel joint, a rod in the lower casing, a hemi-
spherical block secured on the upper end of said rod, a regulator in which said rod
works, consisting of a tubular piece having an external screw thread adjustable in a
screw thread in the lower casing in combination with a socket screwed into the upper
casing, a tool carrier working in said socket, and a hemispherical block secured to
the inner end of the tool carrier, substantially as set forth.
4. In a detail plugger or mallet of the character described a casing A, having an
internal screw thread, a blow regulator consisting of a tubular piece M, having an
external screw thread that fits the screw in the casing A, an annular recess m, iu
the said tubular piece M, and two slots m¹, m³, near its upper end, a
screw N,
passing through the outer casing and entering the annular recess m, and a rod Q,
passing through the tubular piece M, a pin P, passing through said rod Q, its ends
working in the slots m¹, in the tubular piece M, whereby the length of the stroke of
the plugger can be regulated as and for the purpose set forth.
5. In an angular dental plugger or mallet, the body of which consists of two
sections connected together by a coupling ring having teeth upon its upper edge, a

page_text: spring secured to the upper portion of the body and adapted to engage with the said
teeth in the ring, substantially as and for the purpose set forth.
6. In an angular dental plugger or mallet, the body of which consists of two sec-
tions connected together by a coupling ring having teeth on its under side, a slide
free to work in a groove in the lower portion of the body and having teeth at its upper
edge to engage with the teeth in the coupling ring, and a split ring encircling the
lower section of the body for operating said slide, substantially as and for the purpose
set forth.
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.