Improvements in Adjustable Saw Tables.
Year: 1899

page_text: Date of Application, 3rd Jan., 1899-Accepted, 25th Feb., 1899
Improvements in Adjustable Saw Tables.
I, JOSEPH ROCKEFELLER, of 220, Strand Street, Shreveport, in the Parish of
Caddo and State of Louisiana, United States of America, Cabinet Maker, do hereby
declare the nature of my invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
My invention relates to an improvement in adjustable saw tables by which the
table is quickly and readily adjustable in elevation, being maintained level during
the operation and also to means by which the table may be quickly raised for access
to the saw and other machinery beneath the table.
My invention comprises the novel features hereinafter described and claimed.
Reference is to be had to the accompanying drawings forming a part of this
specification, in which similar characters of reference indicate corresponding
parts in all the figures.
Figure 1 is a perspective view of my device;
Figure 2 is a side elevation of the upper portion of a supporting frame, and a
sectional side view of the improved table, and
Figure 3 is a sectional plan showing the means for imparting motion to the
elevating device for the table.
The supporting frame A upon which the table is mounted may be of any
ordinary or desired construction and has a shaft S¹ journalled in its upper portion
and a saw S carried by this shaft. This saw is given motion by a belt or any
other usual means. Extending across the upper portion of this frame on each
side of the saw are two cross bars C and C which are in cross section, of longer
dimensions in one direction than the other and are hinged to the frame by
hinges D and D, so that they may lie flat upon the frame or be swung upwards
into any angular position desired. These cross bars in use act substantially as
links upon which the table B is supported. The table B is of any ordinary con-
struction and is hinged by hinges D¹ to one edge of the cross bar C₁ but may be
lifted clear of the cross bar C. This secures the table against being moved
longitudinally and permits it to be thrown upward for examination of the
machinery as shown in Figure 1, or to hinge upon the cross har C¹ when the elevat-
ing mechanism is operated. To the ends of the cross bars C and C¹ are secured
levers E which are connected by means of a link F pivoted thereto at their lower
ends so that they move in unison. A bar G is mounted to slide in the frame and
is provided with a slot or clongated opening g within which projects a pin f secured
to the link F. This pin is normally in engagement with one end of the slot
The bar G is given reciprocation by means of a threaded rod H which screws
into the end G₁ of the bar G. This rod H is held against longitudinal motion
by means of a peripheral groove therein which engages a plate I secured to the
frame. It is rotated and longitudinal motion given to the bar G by means of a
hand wheel h secured to the outer end of the rod. It will be seen that if the
rod G is given longitudinal motion by rotating the rod H it will act upon the link F

page_text: by means of the pin f and thus swing the levers E and cant the cross bars C and C
so as to elevate the table. This position is shown in both Figures 1 and 2. The
cross bars C and C in their lower position lie flat upon the supporting frame A
but may be canted to such an extent as to extend substantially vertically.
These bars in effect form links upon which the table is supported. The table may be
elevated for examination of the machinery in the manner shown in Figure 1. It
may be carried up even farther than shown in Figure 1, as the link F is free to
move backward by reason of the fact that the pin flies within a slot in the bar G.
The end of the table B which is over the cross bar C is not pivoted thereto but is
provided with downwardly extending lugs or arms B which engage the ends of
the cross bar C and thus prevent side motion of the table.
The mechanism is very simple and cheap in construction and enables the tablė
to be quickly adjusted to any level within its range, maintaining the table at all
times level. It also enables the table to be thrown upward for examination of the
machinery.
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. The transverse table supporting bars pivoted by one edge to the frame and
one of them pivoted by its opposite edge to the table.
2. The transverse table supporting bars pivoted by one edge to the frame and
one of them pivoted by its opposite edge to the table, the two bars being connected
to swing equally.
3. The transverse table supporting bars pivoted by one edge to the frame and
one of them pivoted by its opposite edge to the table, the transverse bars having
lever arms and a link connecting the lever arms.
4. The transverse table supporting bars pivoted by one edge to the frame and
one pivoted by its opposite edge to the table, lever arms on the transverse bars,
a link connecting the lever arms, and a threaded rod mounted in the frame and
connected to the link.
Deted this 3rd day of January 1899