Modular table saw

A portable table assembly for a hand-held portable circular saw of the kind having a base plate and a motor rotated circular saw blade. A boxlike saw table has a substantially planar horizontal top pendently supporting the portable circular saw therebeneath with the blade rising up through a slot in the table top. The upstanding opposite sides of the upstanding rectilinear base of the table supports opposite edges of the table top. A boxlike, open bottom, back-up table is positionable behind the saw table for guiding portions of a workpiece cut by the saw and includes a horizontal top and upstanding rectilinear base with opposite sides supporting opposite edges of the top. Common, separable, knockdown leg units support both tables for use. The back-up table is invertable to nest the saw table therein and therewith to define a storage compartment sized to receive the knocked-down leg units for storage and transportation.

FIELD OF THE INVENTION 
This invention relates to a portable table assembly for a hand-held 
portable circular saw. 
BACKGROUND OF THE INVENTION 
In residential, light commercial and other types of construction, a 
carpenter on the job site must make cross-cuts and rip cuts in long pieces 
of dimension lumber (either construction or finished lumber), often of 
lengths up to or even exceeding 14 feet, and/or in large area panels, such 
as conventional plywood or the like building panels which come in sheets 
up to or beyond four feet wide by eight feet long. These cuts should be 
accurately made to provide a strong and accurately made building structure 
and a satisfactory finish appearance. 
To supply such bulky stock with the stable support required for accurate 
and safe cutting has in the past required the use of heavy, bulky, 
nonportable professional table saws of the type intended to be fixedly 
installed in a commercial woodworking shop. However, these are entirely 
unsatisfactory for use on a residential or commercial building or 
remodeling site because they are too heavy and bulky to be moved about on 
a job site or to be moved back and forth between a job site and a pickup 
truck by two men, they are excessively costly, and despite their large 
size they still normally do not provide a table area of width and length 
sufficient to comfortably handle and accurately guide large stock such as 
conventionally sized building panels, particularly if cuts are to be made 
by one man without an assistant. 
To achieve the portability needed for transport around a job site or from 
job site to job site in a carpenter's pickup or panel truck, compact and 
lightweight table saws and tables for mounting of electric hand circular 
saws have been known. However, unless further means are provided, these 
units are normally not provided with supports capable of supporting the 
table surface at the normal working height (approximately waist height), 
and such portable saw tables and thus often placed directly on the floor 
with the work support surface only a foot or so above the floor, which 
makes cutting cumbersome and unsafe. Moreover, the table area on such 
compact table saws or saw tables is generally so small (for example 
typically less than four square feet) that it is difficult to accurately 
crosscut or rip substantial lengths of dimension lumber and the rip guide 
cannot be positioned far enough from the blade to permit many ripping cuts 
on four by eight foot panels. 
Hand-held electric circular saws are widely used by carpenters on 
residential and commercial building and remodeling sites because of their 
portability. However, it is difficult to achieve accuracy in cutting 
either dimension lumber or panels without recourse to accessory guiding 
devices which tend to be time consuming to use and in many instances 
cumbersone and unreliable for highly accurate work. These disadvantages 
are particularly true in the case of large panels which present additional 
difficulties in supporting of the panel during cutting. 
Accordingly, the objects and purposes of this invention include provision 
of: 
A portable table assembly for a hand electric circular saw which supports 
the saw blade at a convenient working height and provides adequate support 
and guidance for crosscutting and ripping of long dimension lumber pieces 
and for conventional panel material, such as four by eight foot sheets of 
plywood or the like. 
An apparatus, as aforesaid, which provides an unusually large area saw 
table, which in a single table surface provides sufficient width for 
positioning a rip fence from the blade by more than half the width of a 
conventional four by eight foot panel from the saw blade, and which 
provides sufficient fore-aft table width as to permit one man to readily 
rip long dimension lumber or conventional plywood panels. 
An apparatus, as aforesaid, collapsible to form a plurality of units 
variously nestable and stowable within each other to provide a compact, 
relatively lightweight, easily transported unitary package, which package 
can readily be transported by one man and quickly taken down or set up by 
one man. 
An apparatus, as aforesaid, capable of using a wide variety of brands and 
types of hand electric circular saws, in which the hand circular saw can 
be readily and quickly mounted or demounted on the apparatus, and in which 
the hand circular saw may be left mounted on the apparatus when the 
several units of the latter are in their nested and stowed unitary package 
condition for transport or storage. 
Other objects and purposes of this invention will be apparent to persons 
acquainted with apparatus of this general type upon reading the following 
specification and inspecting the accompanying drawings. 
SUMMARY OF THE INVENTION 
The objects and purposes of the invention are met by providing a portable 
table assembly for a hand electric circular saw including a boxlike saw 
table for supporting and guiding a workpiece past the circular saw blade, 
including a substantially horizontal top supporting the portable saw 
therebeneath and an upstanding base having opposite sides supporting 
opposite edges of the top. A boxlike back-up table is positionable behind 
the saw table and includes a substantially horizontal top and a 
rectilinear base having upstanding opposite sides supporting opposite 
edges of the top. One of said bases has an open bottom. Means are provided 
for supporting the bases of the tables on a common plane with the table 
tops at a convenient working height. The open bottom of the base of one 
said table is larger than the base of the other table such that the other 
table is nestable in the open bottom of the one table.

DETAILED DESCRIPTION 
The portable table assembly 10 embodying the invention comprises a saw 
table 11 and a back-up table 12 (FIGS. 1 and 2) shown in a position of use 
in FIG. 1 and in nested condition for transport and storage in FIGS. 2 and 
5. 
The saw table 11 comprises a horizontal, substantially planar top 13 
supported atop a rectilinear, boxlike base 14. The table 11 is preferably 
sheet metal. The top 13 comprises a horizontal substantially planar top 
panel 16 (FIGS. 3 and 4) having depending left and right end flanges 17 
and depending substantially L-cross section front and rear flanges 18 and 
19. The L-cross section front and rear flanges each comprise a depending 
lip 21 (FIG. 3) and a reversely bent (or inwardly directed) lip 22, the 
latter lip being omitted, as at 23, where necessary to permit legs 26 and 
27 (hereafter discussed) of the base to lie flush against the interior 
side of the depending lip 21 of the front and rear flanges 18 and 19. 
The base 14 of the saw table comprises four corner legs 26 fixed and 
depending from respective corners of the top 13, and preferably two 
intermediate legs 27 depending from the front and rear flanges 18 and 19 
near the central portions thereof. The legs 26 and 27 are of L-shaped 
cross section, support the top panel 16 thereon, and engage and are welded 
to the interior surfaces of the flanges 17 and depending legs 21 of 
flanges 18 and 19. Horizontal front and rear base members 30 and 31 are 
preferably of angle cross section with bottom flanges underlying the 
bottoms of the legs 26 and 27 and are welded to legs 26 and 27 to provide 
a rigid base. 
As seen in FIG. 5, the base 14 thus has a front side 36 comprising front 
base member 30 and the legs 26 and 27 upstanding therefrom, and has a rear 
side comprising the rear base member 31 and the legs 26 and 27 upstanding 
therefrom. 
The back-up table 12 is preferably constructed in the same manner as above 
discussed with respect to the saw table 11, except for differences 
hereinafter discussed. Accordingly, corresponding parts of the back-up 
table 12 will carry the same reference numerals, with the suffix "A" added 
thereto, as have been used for parts of the saw table 11. 
A major difference between the tables is that one, preferably the back-up 
table 12, is wider in a forward-rearward direction (namely from left to 
right in FIGS. 1 and 4) than is the other table. In the preferred 
embodiment then, the width W (FIG. 5) of the saw table 13 is slightly less 
than the space S between the sides 36A and 37A of the base of the back-up 
table 12. The back-up table can thus be inverted to receive the saw table 
in nested relation therein for transportation and storage. 
The base 14A of the back-up table 12 is open between the sides 36A and 37A. 
In contrast, fore-aft base members 39 (FIGS. 2 and 3), preferably of angle 
cross section, fixedly connect as by welding the bottom corners of the 
front side 36 to the bottom corners of the rear side 37. This additionally 
rigidifies the base 14 of the saw table 11. A longitudinal reinforcing 
member 41 (FIGS. 2, 3 and 5), here of angle cross section, is fixed as by 
welding centrally to the under side of the top panel 16A of the back-up 
table and extends from end to end thereof to provide a free edge 
substantially at the level of the free edges of the flanges 17A of the 
back-up table top, upon which free edges the base members 39 of the saw 
table may rest when nested in the inverted back-up table as in FIGS. 2, 3 
and 5. 
Whereas the top 13A of the back-up table is preferably planar and without 
interruption, the saw table top 13 is provided with a fore-aft extending 
saw blade slot 45 (FIGS. 2 and 4) spaced between the front and rear edges 
of the table 13 for receiving upwardly therethrough the rotatable blade 46 
of a hand electric circular saw, or the like, schematically indicated at 
47 in FIGS. 3 and 4. Threaded members, such as screws, or preferably 
threaded studs 51 welded pendently to the underside of the saw table top 
13, are provided with nuts tightenable to urge clips 52 to clamp the 
conventional base plate 53 of the saw 47 to the underside of the saw table 
top 13 to fixedly but releasably mount the saw 47 pendently from the saw 
table top, with its blade 46 extending up through the blade slot 45. In 
the preferred embodiment shown, the clips 52 are rigid sheet metal members 
having an elongate central stud receiving slot 56 and separate edge 
flanges 57 (FIG. 6) bent in the same direction out of the plane of the 
central portion of the clip 52 to conveniently grip edges of the saw base 
plate 53. Many hand electric circular saws include means for tilting and 
recessing the blade 56 with respect to the base plate 53 and these 
functions are retained when the saw is affixed pendently to the saw table 
top 13. As seen in FIG. 5, more than sufficient space is provided within 
the confines of the saw table base to fully recess the saw blade 46 
beneath the table top 13. 
The saw table top also has at least one crosscut guideway 61 (FIG. 3) for 
fore-aft guiding of a conventional crosscut, or mitre, guide 62 of the 
kind having a cross head 63 for forwarding stock to crosscut by the saw 
blade and a rail 64 for supporting such cross head and longitudinally 
received in the guideway 61 for sliding therealong. In the preferred 
embodiment shown, the guideway 61 is formed by a fore-aft slot 66 
extending the full fore-aft extent of the table top and opening down 
through the thickness of the saw table top and into the dependent lips of 
the front and rear flanges 18 and 19. An upwardly opening, channel cross 
section trough 68 of sheet metal has an inside width equal to the inside 
width of the slot 66. The trough is aligned with the slot and at its upper 
edges has outwardly extending horizontal edge flanges 69 which are fixed, 
preferably by welding, to the underside of the saw table top to form said 
guideway 61. 
A rip fence 71 (FIGS. 3 and 4) is positionable atop the saw table to extend 
in the fore-aft direction thereacross and is fixedly securable in any 
desired position widthwise of the saw table 13. In the preferred 
embodiment shown, the rip fence comprises a hollow rectangular cross 
section fence member 72 formed of two channel cross section sheet metal 
members 73 and 74 having relatively short horizontal bottom flanges 76 
which are coplanar and have free length edges directly opposed and 
abutting each other. The channel-shaped portions 73 and 74 have longer 
horizontal overlapped flanges 77, wherein the top flange 77 of the fence 
part 74 overlies the top flange 77 of the fence part 73 as seen in FIGS. 3 
and 4. The two fence parts 73 and 74 have the fore and aft ends of their 
bottom flanges 76 cut away to receive upstanding front and rear bars 78 
and 79 within the ends of the cavity formed by the channel-shaped side 
members 73 and 74 of the fence. The bottom portions of such bars 78 and 79 
depend to overlap the front and rear flanges of the saw table top 13 in 
close but laterally slidable relation therewith. The fence channel members 
73 and 74 and bars 78 and 79 are rididly fixed to each other, preferably 
by welding. A hand screw 81 (FIG. 4) is threaded rearwardly into and 
through the depending portion of the front bar 78. The screw 81 is 
threadedly tightenable to tightly grip the front and rear edges of the saw 
table 13 between the inner end of the screw 81 and the rear bar 79 and 
thus clamp the fence 71 in place in the desired location on the table. 
The portable assembly 10 further includes a pair of leg units 91 and 92 
(FIG. 1) which preferably are collapsible sawhorses. Each leg unit is a 
knockdown assembly comprising an on-edge plank 93 (FIGS. 1 and 2) 
preferably of conventional dimension lumber such as a 2.times.4, supported 
at its ends above the ground by conventional foldable A-frame type legs 96 
and 97. In the embodiment shown, each leg A-frame 96 or 97 comprises 
upwardly convergent legs 101 having upper ends which releasably grip the 
on-edge plank 93. The legs are pivotally connected adjacent their upper 
ends at 103 to further support the on-edge plank and are connected near 
their lower ends by a two-link foldable brace 104 having a center pivot 
and pivotal connections to the legs 101. 
The planks 93 are each of length somewhat exceeding the sum of fore-aft 
widths of the saw table 11 and back-up table 12. Thus, for use, the leg 
units 91 and 92 are erected and placed side by side with their planks 93 
extending in the fore-aft direction, as shown in FIG. 1. The spacing of 
the leg units 91 is less than the lateral length of the tables 11 and 12. 
The tables 11 and 12 are placed, the first ahead of the second in the 
manner shown in FIG. 1, upon the planks 93 of the leg units 91 and 92 and 
preferably laterally overhangs same somewhat. While not necessary, 
suitable means such as clamps or bolts may be provided to releasably fix 
the bases 14 and 14A of the tables 11 and 12 to the leg units 91 and 92. 
For example, the bottom flanges of ones of the L-shaped base members 30, 
31 or 39 of the saw table and corresponding base members of the back-up 
table may be releasably fixed to the planks 93 of the leg units. Normally 
however the weight of the tables is sufficient to hold same in place atop 
the leg units during use. 
The crosscut guide 62 and rip fence 71 operate conventionally to guide 
lumber and panels along the top 13 of the saw table 11 for cutting by the 
upward extending saw blade 46 (FIGS. 3 and 4). The leg units 93 support 
the tables 11 and 12 with their tops 13 and 13A coplanar (FIG. 1) so that 
the panels or elongate lumber being ripped would be supported upon and 
will slide readily rearwardly across the top 13A of the back-up table 12. 
The lateral distance between the blade 46 and at least one end (here the 
rightward end) of the top of the saw table exceeds half the width of the 
conventional width panels (for example four by eight foot panels) permits 
the rip fence 71 to be clamped to the saw table top to rip in half such a 
conventional panel. The lateral lengths of the tables 11 and 12 (from 
right to left in FIG. 1) are preferably substantially the same so that 
both provide adequate support for relatively wide workpieces being cut. 
To transport or store the portable table in a compact space, such as a 
portion of the bed of a conventional pickup truck or van, the back-up 
table 12 is lifted off the leg units 91 and 92 and inverted so that its 
base 14A opens upward as in FIG. 2. The saw table 13 is then nested within 
the inverted back-up table also as in FIG. 2. The A-frames of the leg 
units are then folded to release the planks 93 and are folded to achieve 
the knocked-down configuration of the leg units as further shown in FIG. 
2. The lengths of the elements 93, 96 and 97 of the knocked-down leg units 
are each less than the length of the tables 11 and 12 such that the 
knocked-down leg units, along with the rip fence and crosscut guide, are 
storable within the nested tables, as shown at FIG. 5. 
In one embodiment constructed according to the invention, the saw table was 
about 46 inches long by 20 inches wide, the back-up table was about 46 
inches long by 24 inches wide and the height of the tables was about 22 
inches. The tables were cut and bent from 16 gauge sheet steel. 
Although a particular preferred embodiment of the invention has been 
disclosed in detail for illustrative purposes, it will be recognized that 
variations or modifications of the disclosed apparatus, including the 
rearrangement of parts, lie within the scope of the present invention.