Year: 1888

page_text: I CARL ROBERT WALDER of 96 Grossbeeren-strasse, Berlin in the Empire of
Germany, Engineer 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 and accompanying drawings:-
My said Invention relates to vices for holding work as is well understood. The
accompanying three sheets of drawings illustrate the invention clearly.
Fig. 1 Sheet 1 is a side view partly in section of one arrangement of my improved
vice.
Fig. 2 is a view at right angles to Fig. 1 also partly in section at the line a, b
Fig. 1.
The movable jaw A is formed in one piece with a knee S the horizontal limb of
which slides in a box carried by the lower part B₁ of the fixed jaw B. In this
box is a fixed rack Z secured by screws as shown. The movable part S carries a
spindle w, held in position by jamb nuts m m². The outer end of the spindle w
carries a bar c by which the spindle is turned. Upon the spindle an excentric disc e
is firmly keyed or secured and an excentric rod el extends therefrom to one arm d
of a bell crank lever pivotted at d² as shown. The other arm of the bell crank
lever connects to a bar h which carries. at the other end a toe i which engages
with the teeth of the rack Z. If the spindle w and excentric are turned in the
direction of the arrow Fig. 2 it will be evident that the excentric rod e¹ will be
depressed and the bell crank lever turned in such a manner as to cause the bar h
and toe to press against the tooth of the rack in the direction indicated by the
arrow Fig. 1. The jaws A and B will thus be pressed apart so as to release
the object S. On the other hand to grasp or tighten up the work in the vice
the spindle w is turned in the direction contrary to the arrow in Fig. 2 so as to
lift the rod e and thus pull on the bar h and toe i so as to draw the jaws A and B
together. 1 will now describe the means I employ to shift the movable jaw A
towards and away from the fixed jaw B so as to readily adapt the vice to jobs of
various sizes. On the spindle w and in front of the excentric e I fix a cam n and
opposite to the cam I arrange a bar t which slides in bearings and is connected to
Price 1121

page_text: the outer end of the bar h. When the spindle w is turned in the direction of
the arrow Fig. 2 so as to slacken the grip of the vice, the continued rotation of
the spindle w brings the prominent part of the camn opposite to the upper end
of the bar t and depresses the bar t. The bar h is thus turned on the pin and
the toe is lifted and held clear of the toothed rack Z. The moveable part A. S
can now be quickly drawn out or pushed in to any desired position relatively to
the fixed jaw B. When the work is introduced between the jaws the spindle is
turned and the toe i drops into gear with the rack and the tightening strain is
applied by the excentric e in the manner described. When slid backward and
forward the horizontal limb of the part S rolls on an antifriction roller R carried
from the fixed box containing the rack. To prevent dust or iron filings or the
like from interfering with the sliding of the part S I cover the joints with a
flexible shield p made of thin sheet steel or of other suitable material, which is
fastened to the part B₁ and passes beneath the roller O. as. shewn at Fig. 1. The
said shield is sufficiently flexible to bend round the roller O and run up the part S
as shewn.
The remaining two sheets of drawings indicate modifications in my invention.
Fig. 3 is a side elevation and Fig. 4 an end elevation both partly in section of a
modified form of my improved vice. The parts which are similar to or correspond
to other parts already described in Sheet 1 are indicated by similar letters. In
Figs. 3 and 4 the movable and fixed jaws are of similar construction to those
indicated in Sheet 1. The spindle w is formed with a screw thread which engages
with a worm wheel g. A crank pin in the worm wheel g raises and lowers the
connecting rod t' which is connected to the bell crank lever d¹. The said bell
crank lever d¹ is connected by a link to a tumbler which at times engages
with a ratchet rack Z. As shewn in the drawing the spindle w has been turned
sufficiently to raise the tumbler ¹ quite out of gear with the rack, thereby allowing
the movable jaw A to be drawn out to any desired extent. Upon turning the
spindle w in the direction indicated by the arrow in Fig. 4 so as to allow the rod t¹
to drop, the tumbler is brought into gear with the rack Z and drawns the jaws A
and B closely together gripping the work firmly. The employment of the worm
and wheel in this modification enables great power to be brought to bear upon the
gripping of work in the vice.
Fig. 5 (Sheet 3) shows another modification in the vice. In this instance the
pressure generated by the spindle w is brought to bear upon the bar h more directly
than in the foregoing cases. The spindle w is screwed as shewn and terminates in a
ball which occupies a socket formed in the head of the double lever k. k¹. This lever
is pivotted at k³ and the lower end k¹ is connected to a bar h which terminates in a
toothed shoe i which engages with a rack Z. When it is wished to lift the shoe i clear
of the rack I press upon the trigger piece or extension h' using the fixed tail ! as a
fulcrum. By turning the screwed spindle to so as to advance it the jaws are drawn
together. By turning it so as to withdraw the spindle the jaws are separated. Fig. 6
illustrates the same arrangement with a slight modification, the object of which is to
effect the raising and lowering of the toothed shoe i automatically out of gear with
the rack instead of by hand as in Fig. 5. This automatic raising of the shoe i is
effected by forming a short lever arm on the double lever k, k¹ and opposite to the
pivot k³.
The lever arm is connected by a forked link and stud u to an
extension h³ of the bar h. When the screw w is turned so as to open the jaws A. B
the link is pushed downward and pressing on the stud u tilts the bar h on the pin d'
(similarly as in Fig. 1.) thereby lifting the shoe i clear of the rack Z and allowing the
jaws to be drawn apart. When the screw w is reversed the link rises and the shoe i
is again dropped into gear with the rack.
r
.
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.

page_text: the improved vice described and illustrated in sheet 1 of the drawings and the
several modifications thereof illustrated in sheets 2 and 3 substantially as described
and shewn.
(2) In a vice of the indicated description the improved means for opening and
closing the jaws, and consisting of an excentric fixed on the spindle of the vice and
arrangement to operate a bell crank or other lever, which is connected to a bar having
a toe or catch which engages with a rack secured to the fixed portion of the vice in
combination with the cam and rod for automatically raising the catch or toe out of
gear with the rack at the times when it is desired to shift the movable jaw nearer to
or further from the fixed jaw, substantially as hereinbefore described and shewn on
sheet 1 of the drawings.
(3) In a vice of the indicated nature operating the movable jaw of the vice by a
worm on the spindle which gears with a worm wheel whereby movement is commu-
nicated to a bell crank lover which is connected to a pivotted toothed tumbler or catch
which engages at the required times with a fixed rack for the purposes and substantially
as described and shewn on sheet 2 of the drawings.
(4) The arrangement shewn on sheet 3 of the drawings for operating the movable
jaw of the vice and consisting of a pivotted lever connected at the upper end by a
ball and socket or other suitable joint to the inner end of the screwed spindle w and
at the lower end to a bar h provided with a toothed shoe which engages with a
fixed rack in combination with the means for raising the shoe out of gear with
the rack by hand when desired as shewn at Fig. 5 or otherwise in combination with
the means for automatically raising the shoe out of gear with the rack, as shewn
at Fig. 6 of the drawings and as hereinbefore described.
(5) The flexible shield p for protecting the joints of the sliding parts of the vice
substantially as described and as shewn in the drawings.
ለነ
.
000
DUTTON & FULTON,
1, St. James Square, Manchester,
Agents.