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Патент USA US2129476

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Sept. 6, 1938.,
Filed June 30, 1857
?dazjah C- Packer1
Patented Sept. 6, 1938
Adolph Carl Pacher, East Hartford, Conn.
Application June 30, 1937, Serial No. 151.122
1 Claim.
‘This invention relates to lathe dogs and par
ticularly to an improved construction wherein
a plurality of clamping screws are used to hold
the work in proper place.
An object of the invention is to provide a dog
either with a curved or straight tail arranged to
readily clamp work of different shapes and dif
ferent sizes.
Another object of the invention is to provide
a dog wherein there is presented a plurality of
clamping set screws and clamping blocks.
A further object of the invention is to provide
a dog in which removable and interchangeable
shoes may be utilized either with one or two
clamping screws.
In the accompanying drawing:
Fig. 1 is an elevation of a lathe dog disclosing
an embodiment of the invention, certain parts
being broken away for better illustrating the con
(Cl. 82—41)
desire. The boss 5 together with the body I ad
jacent thereto are provided with a broached hole
or socket it which is preferably square in cross
section so as to receive the square shank M of
the shoe l5. Preferably the shank l4 does not}
quite extend through the hole to facilitate the
removal of the shoe l5 internally. This arrange
ment also results in the curved surfaces l6 and
ll properly ?tting against the curved inner sur
face 6 of the body I. In this way the strain of 10
the set screw II] against work l2 will be ap
plied to shoe l5 and communicated to the body
l instead of to the bottom of the socket l3. Shoe
i5 is provided with a straight working surface
it which is interrupted by a V-shaped groove H! 15
as shown particularly in Fig. 5.
This groove
must be located in the center of the shoe and is
provided so that cylindrical or irregular shaped
pieces of work may be properly received and
20 struction ;
properly centered by the shoe I 5 and the set
Fig. 2 is a sectional View through Fig. 1 ap
proximately on the line 2—2;
Fig. 3 is a detail sectional view through Fig.
1 approximately on the line 3-3;
Fig. 4 is an elevation of a shoe with its shank
screws | 0 and l I. In case the shoe I5 is too large
a similar but smaller shoe 2!] shown in Fig. 6
may be used.
It will be noted that shoe 20 has the same
size shank M’ as shank l4 so as to properly ?t
into the hole or socket l3. It will be evident that
embodying certain features of the invention;
Fig. 5 is a front view of the shoe shown in
Fig. 4;
Fig. 6 is a view similar to Fig. 4 but showing
30 a smaller shoe with a smaller groove.
Referring to the accompanying drawing by
numerals, l indicates the body of the dog which
may be provided with a suitable tail or horn 2.
From an examination of Figs. 1 and 2 it will be
35 seen that the dog is made very strong and sturdy
throughout. The body I is provided with en
largements or bosses 3, 4 and 5 and between these
enlargements or bosses the body is formed sub
stantially as shown in Fig. 3, namely with a
40 straight flat inner surface 6 with curved outer
surfaces 1 and 8 merging into a rounded outer
edge 9. This results in great strength with a
minimum amount of material. The respective
bosses 3 and 4 are provided with threaded aper
45 tures in which the set or clamping screws Ill and
II are mounted. These screws are adapted to
press against the work H as the workman may
larger shoes than shoe l5 with larger V-shaped
grooves may be used if ‘desired, or even smaller
shoes than shoe 28. Preferably six shoes of dif
ferent sizes are provided with each dog whereby 30
the work may be properly centered within the dog.
I claim:
A lathe dog comprising a substantially ring
shaped body having a radially extending bore, a
shoe having a body formed with a work-receiv
ing face, an arc-shaped back ?tting against the
inner wall of said ring-shaped body, and a shank
fitting into said bore, a set screw on the diamet
rically opposite side of said substantially ring”
shaped body to said bore, said set screw being
adjustable toward and from said bore, and a
second set screw carried by said substantially
ring-shaped body and adjustable toward and
from the center of the substantially ring-shaped
body in a direction at an angle to the ?rst men
tioned set screw.
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