Improvements in Joiners' Clamps.
Year: 1899

page_text: Date of Application, 26th Oct., 1899-Accepted, 16th Dec., 1899
Improvements in Joiners' Clamps.
I, GUSTAV SCHMIDT, of No. 16, Breitestrasse, Elberfeld, Germany, Joiner, 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 improvements in joiners clamps and it has for its
object to press together two or more pieces of wood, which are to be glued to-
gether and which may stand at different angles and whereby the direction of the
pressure exerted may vary or be different, whereas in the ordinary clamps hitherto
in use the sides of the wood pressed together are parallel.
In order to attain these objects the new clamp is so arranged, that by means
of the same a clamping action can be exerted in one direction only or in several
directions standing at different angles to each other.
On the accompanying drawing the new clamp is shown in two manners of con-
struction.
Figure 1 shows one construction in side view with the central pressure check
pressing against the wood near the upper one of the two other cheeks;
Fig. 2 is a similar view with the central pressure cheek pressing against the
wood near the lower one of the two other cheeks;
Fig. 3 is a cross section along line I-I of Fig. 2;
Fig. 4 shows the varied construction, the two main cheeks in closed position;
Fig. 5 the same with a piece of wood clamped between the two main cheeks
and the third one pressing another piece of wood against the first one.
The new clamp resembles a hand vice or a pair of tongs, the armis or shanks
A, A¹ of which at one end are hinged to a cross head G by bolts B, to the other ends
of the same, cheeks C being fixed movably by bolts S.
The closing and opening of the arms A according to the construction of
Figures 1-3 is done by means of a right and left threaded screw D, which finds
its female threads in nuts E pivoted to the sides of the arms; a crank F serving
to turn the screw D.
The cross head is bored out centrally and projects inwardly between the two
shanks at the inner end it is provided with double ears M at the sides facing
the shanks A, so that these are held and guided in these forks; screw threads is
cut in the boring of the cross head and a bolt H is screwed therein provided at the
outer end with handle K and at the inner end with cheek L connected to it by a
ball and socket joint U allowing the cheek L to be turned at any angle within
a certain limit with regard to the axis of the bolt H.
To the cross bolt D is fixed in the middle a guide J serving to guide the bolt H
crossways and preventing it from falling out in the other direction.
From the description given and from the illustration it will now be easily
understood, that by means of this clamp a piece of wood W or two such pieces
having to be glued together can be held firmly between the cheeks C, whereby
the pressure faces of the cheeks may be parallel or inclined to each other as

page_text: indicated in dotted lines in Figure 1 and it will also be seen that the cheek L
can be directed and press against the piece of wood to be worked at any point
nearer or further away from either the lower cheek C or the upper one, as may
be desired.
Exactly the same results can be attained by means of the varied construction
of the clamp shown in Figures 4 and 5.
The shanks A and A¹ are here exactly of the same construction as before, at
their free ends they are provided with the cheeks C by bolts S; the other ends
being bolted to a cross head G by bolts B, and double cars M thereon serve for
guiding the shanks A, A¹; a screw bolt H screwed through the crossead G and
carrying at one end a handle K and a cheek L at the inner end being provided
same as in the preceding case.
The only difference consisting in the device for closing and opening the
shanks A, A¹ and the cheeks C respectively. For this purpose bars N are con-
nected movably to the shank A by bolts N1; these bars reach crossways beyond
the shank A and here an eccentric Q pivoted to the bars N between them, so
that its circumference bears upon the edge of the shank A'; a hook, R which is
bolted to said shank and grasping with its free end into a curved slot Q₁ of the
excentric Q, keeping the eccentric surface in contact with the shank A¹, when
the excentric is turned round on its pin Q by the arm or lever O, whereas a
pawl P, fixed to the shank and engaging with the ratchet teeth T of the excen-
tric Q, hinders the opening of the clamp.
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 clamp the combination of shanks A, A' having movable cheeks C fixed
at their free ends, with a cross head G bolted to the other ends of said shanks,
ears M on said cross head, a screw bolt H passing centrally through the cross
head, a movable cheek L at the inner end of the bolt H, movable nuts E at the
sides of the shanks A A', a right and left threaded screw bolt D passing through
said nuts for closing and opening the shanks, a guide J fixed to the middle part
of bolt D for guiding the bolt H, the whole as described and illustrated and for
the purpose set forth.
2/ In a clamp the combination of shanks A, A¹ having movable cheeks C fixed
at their free ends, with a cross head G bolted to the other ends of said shanks,
ears M on said crosshead, a screw bolt H passing centrally through the crosshead,
a movable cheek L at the inner end of the bolt H, bars N bolted movably to the
shank A, an eccentric Q held movably between the bars N by a bolt Q upon the
face of shank A¹, a slot Q¹ in said excentric, a hook R fixed on shank A¹ and
reaching into the slot Q¹ of the excentric, ratchet teeth T at one side of the cir-
cumference of the excentric, a pawl P engaging with the teeth T and an arm O
for turning the excentric, the whole as described and illustrated and for the pur-
pose set forth.
1000