Improvements in Door-lifting Appliances.
Year: 1897

page_text: Date of Application, 5th Mar., 1897-Accepted, 15th May, 1897
Improvements in Door-lifting Appliances.
I, CARL RUDOLF MÜLLER of Linz on the Danube, in the Empire of Austria,
Overseer, 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 :-
By means of this implement doors of all kinds can be lifted for the purpose of
oiling their hinges, etc., by a single person, maintained in this position independently
of the pressure of such person's foot, as well for the object of cleaning can be
raised exceptionally high, and, thereto, their compete taking down can be effected
without any additional assistance.
All these requirements I attain by producing an arresting, door-lifting
contrivance which, easily operated by the foot, by a slight manipulation can
be put into a condition to effect such a heaving up of the door as will well suit its
cominodious lifting off or unhinging.
To accomplish the prising up of a door I use a board (A) which is furnished
with a castor or roller-like bottom block (a) and a metal foot or under-grip (a¹).
A support or prop (C) so joined with the treadle or treadle-board (A) as to
revolve at the point (d) makes possible the normal lifting up of a door for the
purpose of oiling its hinges, etc.
The prop (C) in the mode shown in Figure 4 revolves round the point (d) as a
centre of rotation, and can in both its extended directions be held arrested. To
effect this arrestation two plates (a³) and (a³) are screwed on the treadle-
board (A) underneath. These plates at their centres have circular holes (a³)
and (a) in which catches the round stud (c) of a connecting-plate (c) of the
prop (C) which is held by spring-pressure.
The before mentioned lifting up of the door ensues when, as is illustrated in
Figures 1 and 2, the rotating prop (C) is turned outwards. In this case by means
of the connecting-plate (c) which has an upward spring-pressure, the stud (c)
holds the prop (C) in its end position, this stud (c) falling into and remaining in
the circular shaped aperture (a). In the same manner an arrestation of the
prop (C) in its inwards-turned longitudinal position in (a), as presented in
Figure 3, is obtained, this being a case, however, when the question is whether the
door with the aim of cleaning it, and so forth, shall be lifted completely out of the
eyes of the hinges. Of course it is self-evident that in these circumstances also
the door is not lifted wholly off but only so high that by that time it can be easily
taken down.
But the foregoing implement possesses a much more important function than
that just specified, in that the door after being raised can, too, be maintained in its
elevated position without further trouble, so that the person employed for the duty
need concern himself with nothing but the thorough oiling of the hinges.
With the treadle-board (A) already armed by (a) and (a¹) a shore-attach-
ment (B) is combined in such a manner that it is altogether independent of the
intrinsic action of such treadle-board (A) and in respect to this board can be at
any moment pushed into two positions which are important for the implement.
Both these positions in relation to (A) are depictured in Figures 1 and 2.
When (B) is in the position according to Figure 1 the implement is pushed

page_text: forward with its foot or under-grip (a) under the wing of a door opened at about
right angles, while (C) is in the position shown in Figures 1 and 2. Then follows
a lifting of the door to a somewhat greater height than the shoulder (B°) on both
sides of the shore (B), Figure 4. While therefore for that object the right foot
resting on the treadle-board (A) lifts the door, the left foot pushes the shore
forward and just as represented in Figure 2. From then onward the door is
completely and securely supported and the servant can proceed to do whatever
oiling is needed..
Yet so that both treadle-board and shore remain united nor can become
disconnected the one from the other, as also that the required relative shifting of
both parts is feasible, the roller-like bottom-block (a) has at each side a peg or
rib (a) which moves freely in slits or grooves (b) in both sides of the shore (refer
also to Figure 5), while the integration of the double-shouldered shore (B) is
accomplished by a cross-piece (b), as well as by means of the disposition of two
stubs or struts (62) which above the treadle-board join the parts of the shore
together, making it possible by putting the left foot between these last to
simultaneously push the shore under the lifted door, while the right foot still rests
upon the treadle-board.
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 :
A combined door-lifter and holder appliance specifically distinguishable by
certain points, to wit, that, provided with a swinging, lift-limiting prop (C), also
with a roller-like bottom-block (a) and a metal foot or under-grip (a¹), a treadle-
board (A) and a shore (B) are united in such a manner as to be freely movable
by means of the two pegs or ribs (a) of the treadle-board (A) in the slits or
grooves (b) in both sides of the shore (B) which latter borders or partly surrounds
the treadle-board (A) and is by means of a cross-piece (6) and stubs or struts (62)
held compactly together; that both these principal parts are inseparably combined,
the shore, however, not being subjected to pressure from the lifted door is pushed
underneath the same and relieves the operator's foot.
Dated this 20th day of February 1896.
CARL RUDOLF MÜLLER,
Maschinenmeister, Linz a Donau, Lustenau 119.