Year: 1899

page_text: Date of Application, 20th Feb., 1899-Accepted, 25th Mar., 1899
with this invention.
Figure 2 is a transverse sectional view.
Figure 3 is an enlarged detail sectional view, illustrating the manner of con-
necting the thumb piece or head of the adjusting screw to the body portion
thereof.
Figure 4 is a longitudinal sectional view, illustrating a modification of the
invention.
Like numerals of reference designate corresponding parts in all the figures
of the drawings.
1 designates a stationary jaw, cooperating with a sliding jaw 2, which is
mounted on a shank 3, having concave side faces 4, and provided with a rounded
rear face 5. The shank is provided at its front edge with shouldered teeth 6,
adapted to be engaged by a dog 7, which is housed within a casing or extension 8,
of the movable jaw, and the latter, which is provided with an opening for the
passage of the shank 3, has the same enlarged towards its inner end, whereby
the movable jaw is adapted to swing laterally of the shank sufficiently to carry
the teeth 9, of the dog, into and out of engagement with the teeth 6 of the
shank. The dog is carried by the movable jaw in its movement transversely
of the shank, and the teeth 6 and 9 are retained in engagement with each other
by means of a coiled spring, 10, located at the inner end of the movable jaw, and
interposed between the back of the same and the rear face of the shank. A
screw 10 may be arranged at the back of the sliding jaw, as shown in Figure 4,
and is provided with a recess 10b forming a seat for the coiled spring 10, and by
compressing the latter, the dog may be readily disengaged from the shank, and
the sliding jaw can then move freely on the latter, to bring it adjacent to or
carry it away from an object, and to enable it to be quickly adjusted approxi-
mately to such object. The screw 10ª which is mounted in a threaded opening
of the back of the sliding jaw, is adapted to regulate the tension of the spring
and it is capable of being screwed inward into contact with the back of the
shank, to lock the jaw against lateral movement and prevent the dog from

page_text: becoming disengaged from the teeth should the shank be swung backward instead
of forward during the use of the wrench. The back portion of the sliding jaw
is recessed between the ends, as shown, to lighten the construction.
The sliding movement of the jaw 2 on the shank permits the jaws to be
arranged close to the opposite sides of a nut or other object, and when the teeth 6
and 9 are engaged with each other, the sliding jaw drops back slightly. The
desired pressure on the object is, effected by means of a longitudinal adjusting
screw 12, having a threaded portion 13, engaging a correspondingly threaded
opening or socket 14 of the jaw 2. The screw has a smooth portion 15, which
passes through an opening 16 of the dog and it is reduced to form a shoulder 17,
for engaging the inner or front end of the dog, whereby the screw is adapted
to bear against the dog and force the sliding jaw forward into engagement with
the object to be clamped. The smooth portion 15, is further reduced at its
center, at 18, to provide an intervening annular space between it and the dog,
to reduce the friction between the screw and the latter to a minimum.
The outer end of the screw is reduced and threaded, at 19, right-hand screw
threads being provided and a milled head or thumb piece 20, which is corre-
spondingly threaded, is arranged on the reduced portion 19. In order to lock
the head or thumb piece on the adjusting screw, a left-hand threaded screw 21,
is employed and engages a socket 22, formed in the reduced end of the screw 12
and provided with left-hand screw threads. The head of the screw 21 engages
the thumb piece or head 20, at the outer face thereof, and effectually prevents
the same from accidentally unscrewing.
The casing of the sliding jaw extends beyond the dog and a sleeve 23 is
interposed between the head or thumb piece 20, and the adjacent end of the dog,
and forms a shoulder for engaging the latter. By arranging the dog between
the shoulder 17 and the sleeve, a swivel connection between it and the screw is
provided. The casing is provided with a transverse fastening device 24, con-
sisting of a rivet or the like and passing through the space between the dog
and the head or thumb piece 20. The movable jaw and the casing may be con-
structed of a single piece of metal, as illustrated in the accompanying drawings,
or those parts can be made in separate pieces and suitably secured together if
desired.
In Figure 4 of the accompanying drawings is illustrated a modification of
the invention, in which the adjusting screw 25 is swiveled to the sliding jaw
and engages screw threads of the dog, the screw threads 26, of the adjusting
screw being located between the ends thereof, as shown. The inner or rear end
of the screw is provided with a head or thumb piece, as before described, and the
forward or inner end of the screw is provided with a smooth bearing portion or
head 27, arranged in a bearing socket 28, and retained therein by a screw 29,
mounted on the sliding jaw, as shown, and engaging the head at the inner
end thereof.
The invention has the following advantages:
The wrench is simple, inexpensive, strong and durable, and is adapted to have
its sliding jaw quickly moved along the shank to bring it adjacent to the nut
or other object to be clamped, and the screw will permit the sliding jaw to be
further adjusted to secure the necessary pressure. The spring is housed within
the casing of the movable jaw, and the parts are compactly arranged and not
liable to get out of order.
Changes in the form, proportion and minor details of construction, such as
varying the arrangement of the adjusting screw, may be resorted to without
departing from the spirit or sacrificing any of the advantages of this invention.
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. In a wrench, the combination of a toothed shank, a sliding jaw mounted

page_text: thereon and capable of a limited movement laterally thereof, a dog carried by
the sliding jaw in its lateral movement, and a screw also carried by the sliding
jaw in such movement, said screw connecting the dog and the jaw and adjustably
engaging one of said parts, whereby the jaw may be advanced independently of
the dog, substantially as described.
2. In a wrench, the combination of a toothed shank, a sliding jaw mounted
thereon and capable of a limited movement laterally thereof, a dog carried by
the sliding jaw in its lateral movement, a screw also carried by the sliding jaw
in such movement, said screw connecting the dog and the jaw and adjustably
engaging one of said parts, whereby the jaw may be advanced independently of
the dog, and a spring housed with the sliding jaw and interposed between the
back of the same and the rear edge of the shank, substantially as described.
3. In a wrench, the combination of a toothed shank, a sliding jaw mounted
thereon, provided with a hollow extension or casing and having a limited move-
ment transversely of the shank, a dog housed within the casing and engaging
the shank, a screw connecting the dog and the jaw, said screw and dog being
carried by the jaw in its transverse movement, and a spring for holding the dog
normally in engagement with the shank, substantially as described.
4. In a wrench, the combination of a shank, a sliding jaw having a limited
movement transversely thereof and provided with a threaded socket or opening,
a dog carried by the jaw in its transverse movement, and an adjusting screw
swiveled to the dog and having a threaded portion engaging the threaded opening
or socket of the jaw, substantially as described.
5. In a wrench, the combination of a shank, a sliding jaw, a dog mounted on
the sliding jaw and engaging the shank and provided with an opening, an
adjusting screw having a threaded portion to engage the jaw, and provided with
a smooth portion passing through the opening of the dog, said screw having a
shoulder to engage the inner end of the latter, a sleeve arranged on the outer
end of the screw and engaging the dog, and a head fitting against the sleeve,
substantially as described.
6. In a wrench, the combination of a shank, a sliding jaw having a hollow,
casing and capable of a limited movement transversely of the shank, a dog
housed within the casing and carried by the jaw in its transverse movement, a
screw swiveled to the dog and engaging the jaw, and a fastening device passing
through the sides of the casing and located at the outer end of the dog, sub-
stantially as described.
7. A wrench having an adjusting screw provided with a reduced portion
having right-hand screw threads, said screw being also provided with a socket
having left hand screw threads, a head having a threaded opening and engaging
the right hand screw threads of the reduced portion of the screw, and a left hand
threaded screw arranged in said socket and engaging the head, substantially
as described.
8. In a wrench, the combination of a shank, a sliding jaw having a limited
lateral movement and provided at one side with means for engaging the shank,
a spring interposed between the opposite side of the shank and the sliding jaw,
and a screw mounted on the sliding jaw, forming a seat for the spring and
adapted to engage the shank to lock the sliding jaw against independent lateral
movement, substantially as described.
1000
For the Applicant,
J. G. LORRAIN,, M.I.E.E., M.I. Mech. E.,
Norfolk House, Norfolk Street, London, W.C., Chartered Patent Agent.