WO2002051600A1

WO2002051600A1 - Collapsible portable saw stand

Info

Publication number: WO2002051600A1
Application number: PCT/US2001/048026
Authority: WO
Inventors: W. Scott Kahle
Original assignee: Kahle W Scott
Priority date: 2000-12-27
Filing date: 2001-12-11
Publication date: 2002-07-04
Also published as: US6578856B2; US20010047712A1

Abstract

A collapsible stand for supporting a table top machining tool, e.g., a table saw. The stand comprises a lateral support structure, such as a platform for holding the tool (18); a secondary support frame (30) having a first end pivotally attached to a first end the lateral support structure; and a main support frame (20) pivotally attached to the secondary support frame, wherein the main support frame comprises handle (26) at a first end for transporting the stand in its collapsed position, and wherein the handle comprises an out feed support (22) for the table saw when the stand is in its set up position.

Description

COLLAPSIBLE PORTABLE SAW STAND

Cross References to Related Applications

This application claims the benefit of provisional patent application serial number

60/175,180 filed on 1/10/00, entitled "Collapsable Portable Saw Stand."

Background of the Invention

1. Field of Invention

This invention relates to a method and apparatus for supporting and carrying a

portable table saw, particularly an apparatus that supports a table saw as well as the

workpiece on the out- feed end of the table saw.

2. Description of Prior Art

It is desirable for anyone using a portable table saw to provide a safe and stable means

of support from which to work, as well as the ease of mobility and convenience of portability.

It is also desirable to quickly and easily set up and take down any apparatus employed to

support the saw. This makes for convenience and efficiency for tradespeople as well as anyone else using the saw. Typically, users would carry the saw to the work place and then

set up "on-the-fly" utilizing what ever temporary means that can be mustered up quickly. Not

only is this practice inconvenient, it is unsafe.

Several manufacturers have designed and marketed apparatuses for supporting and/or

transporting the saw. The problems with most of these designs are that they are not very portable. Nor do they provide the stablity required of a table saw. Also, none of them

provide a means for out- feed work support. The out- feed is that portion of the workpiece that has been run through the table saw as it comes off the rear of the table. Long pieces of wood being cut on a table saw can become cumbersome and unsafe as it is pushed through the

blade as the weight on the out-feed section is usually unsupported. This unsupported weight

tends to create a condition of unbalance and may cause the entire apparatus to tip.

Trojan Manufacturing of Portland, Oregon offers two such saw stands. U.S. patent

5,778,953 to Lawrence D. Braddock (07/14/1999) refers to Trojan's "Ripmaster Table Saw

Stand". This stand does have wheels for transport, but it is not easily set up and taken down

for transport. With the "Ripmaster", the operator must initiate several steps to put it together

and take it apart each time it is to be used or put away. Once the "Ripmaster" is set up, it

lacks the stability required to push a large workpiece through, making it susceptible to tipping

over. It also lacks the all important out-feed work support. Without a out-feed support, the

long workpiece becomes heavy on the out-feed end and tends to make the apparatus

unbalanced.

Trojan Manufacturing also offers another saw stand specifically for DeWalt's model

DW-744 table saw. MS-2000X as seen in Tool Crib of the North in Tool Crib of the North

Catalog 904 (06/01/1999) refers to this new stand. It too, as does the "Ripmaster" lacks the

out-feed support. It does have wheels for transport, but the handle used for transport is low

and some users may have to stoop uncomfortably to reach it, possibly causing undue

backstrain. Also, the legs must be taken off to take it down and put back on for set up. This

makes it inconvenient for portability as it must be assembled each time it is set up and

unassembled to take it down.

U.S. patent 4,955,941 to Tony Rousseau (07/11/1990) refers to a stand for portable

table saws marketed by Rouseau Company. This stand too, is cumbersome to set up and transport. It also lacks wheels for easy transportability. An optional out-feed support is available as an add-on device, but this add-on apparatus is cumbersome to attach each time of

use and detracts from portability. It also adds expense to purchase the entire apparatus.

Both of Trojan Manufacturing's table saw stands as well as Rosseau's lacks the

stability required for pushing a larger workpiece through the saw. Each of these designs require the workpiece to be pushed across the direction of the legs of the stand, or sideways.

This is not as stable as a design such as the current invention in which the user pushes the

workpiece directly against the support structures, or legs.

Summary Of The Invention

In a first aspect, the invention provides a collapsible stand for supporting a machining

tool, comprising: a lateral support structure for holding the machining tool; a secondary

support frame having a first end pivotally attached to a first end the lateral support structure;

and a main support frame pivotally attached to the secondary support frame, wherein the main support frame comprises a handle at a first end for transporting the stand in its collapsed

position, and wherein the handle comprises an out feed support for the machining tool when

the stand is in its set up position.

In a second aspect, the invention provides a collapsible stand for supporting a tool,

comprising: a lateral support structure for supporting the tool; and a main frame support having a handle for transporting the stand in a collapsed position, wherein the handle

provides an out feed support for the tool in a set-up position.

In a further aspect, the invention provides an apparatus for carrying and supporting a portable bench top machining tool, said bench top machining tool having a predetermined

means for fastening to a planar surface thereof, the apparatus comprising: (a) a relatively rigid main support frame, said main support frame including two

substantially parallel rails;

(b) a out- feed work support consisting of a member attached substantially peφendicular to and at first ends of said parallel rails of said main support frame for either or

both puφoses of supporting a long workpiece as it is passed through said portable bench top

machining tool and as a handle for when said apparatus is being transported or otherwise

handled;

(c) a secondary support frame for supporting said apparatus during use; said secondary

support frame including two substantially parallel rails and a cross rail positioned

substantially peφendicular to and near first ends of said parallel rails of said secondary

support frame;

(d) a set of pivotal connections joining each said parallel rail of said secondary

support frame at approximate mid points of each said parallel rail of said secondary support frame with each corresponding said parallel rail of said main support frame, at a point

between the mid points and the second ends of said parallel rails of said main support frame;

(e) a platform including a planar surface for the puφose of fastening the bench top

machining tool; first end of said platform being pivotally connected to second end of said

parallel rails of said secondary support frame; and

(f) a means for removably affixing, demountably connecting, releaseably latching or

otherwise temporarily securing second end of said platform to said main support frame at a

point such that said platform will rest relatively parallel to ground plane when said apparatus

is set-up for use whereby the user shall be provided with a conveniently collapsible, stable and safe support structure to accommodate the machining tool. Accordingly, several advantages of the invention are: (i) Ease of operation. The current invention is collapsible and can be set up with a

minimum of time and effort. There are no removable parts that must be assembled and unassembled between usage. Simply snap it together to collapse and unsnap to set up.

(ii) Mobility. The invention is easily transportable with a pair of large wheels that

easily roll over the ground and even up steps.

(iii) Out-feed support. The invention incoφorates a out-feed work support structure

that supports the weight of a long workpiece. This feature eliminates the need for the user to

bear down on the in-feed portion of the workpiece with his hands being close to the blade, in

order to prevent the workpiece from falling. It also reduces the likeliness of the saw and

stand tipping over from the weight of the out-feed workpiece.

(iv) Simple design. The invention utilizes a simple design which is economical to

fabricate and easily used.

(v) Simplicity and convenience of use which makes using this saw stand more

efficient and thus more profitable for professional trades people.

Still further objects and advantages will become apparent from a consideration of the

ensuing description and accompanying drawings.

Brief Description of the Drawings

Fig. 1 is an isometric view of my invention in the set-up position, with a table saw

affixed and ready for use. Fig. 2 is an orthogonal view of my invention in the set-up position with a table saw affixed and ready for use. Fig. 3 is an isometric view of my invention in the collapsed position with table saw

affixed and ready for transport.

Fig. 4 is an orthogonal view of my invention in the collapsed position with table saw

affixed and ready for transport. Fig. 5 is a close-up view of a transport latch.

Fig. 6 is a close up view of a set up latch.

Detailed Description of the Invention

Reference Numerals

10 apparatus 12 saw

14 body

16A pivotal connection

16B pivotal connection

16C pivotal connection

16D pivotal connection

18 platform

20 main support frame

22L pin

22R pin 24L set-up latch

24R set-up latch

26 out-feed work support 28 blade

30 secondary support frame

32L transport latch 32R transport latch

34 cross rail

36L retainer

36R retainer

38 handle 42L wheel

42R wheel

Referring to FIG. 1 through 4, an apparatus 10 is employed for carrying and

supporting a portable table saw 12. The saw 12 can be one of a number of commercially

available makes and models of portable table saws, such as but not limited to those

manufactured by such companies known as DeWalt, Black & Decker, Hitachi, Delta, Makita,

Ryobi, Skil, and Craftsman. The saw 12 generally has a body 14 including provision for

attachment to a bench, table or frame at bottom of body 14 thereof. Typically, the body 14 is fastened by means of a threaded screw attachment to the bench, table or frame. This threaded

screw method of fastening is well known in the existing art of fastening and therefore is not

specified in detail. However, other methods, as known in the art of fastening may be

employed without departing from the principles of the invention.

The apparatus 10 includes a main support frame 20 which is pivotally connected to a secondary support frame 30 via two pivotal connections, pivotal connection 16A and pivotal connection 16B. These pivotal connections may be one of several methods as is well known

in the art of pivotal connections and therefore are not specified in detail.

The main support frame 20 includes a pair of identical pins, pin 22L and pin 22R (the latter not shown) for supporting a platform 18 when apparatus 10 is in the set-up position, as

can be seen best in Fig 1 & 2. Although this preferred embodiment is described comprising a

platform 18, it should be understood that any type of lateral support structure, such as platform 18, crossbar(s), brace, frame, etc., could be utilized to support saw 12 and therefore

fall within the scope of this invention.

The main support frame 20 also includes an out-feed work support 26 which is to

support an object after it is fed through the saw blade 28 at which point the object extends

past the edge of saw 12. The out-feed work support 26 is positioned to be in the same plane

as the top of the saw 12 when apparatus 10 is in the set-up position. This can be seen more

clearly in Fig 2. The out-feed work support 26 is also used as a handle while apparatus 10 is

being transported as can be seen in Fig. 3 & 4. To achieve the correct height of the out- feed

work support 26 in relation to the top of the saw 12, shims may be placed below saw 12 to

raise or lower it as necessary. Alternatively, a mechanical system (e.g., a jack or a lift) could

be used to raise or lower the saw. In addition, the out-feed work support 26 could be

extendable (e.g., telescoping) to adjust its height.

The secondary support frame 30 includes a pair of identical latching mechanisms,

transport latch 32L and transport latch 32R, one on each side of the secondary support frame

30, as can be seen in Fig 1. The transport latches 32L and 32R are each shaped and placed precisely so as to engage with pin 22L and pin 22R respectively, when the apparatus 10 is in the collapsed position as can be seen in Fig. 3 & 4. Most preferably, the set-up latches 24L &

24R include spring tension and are designed such that during the process of collpasing the apparatus 10, the latches will be guided by pins 22L & 22R to swing over the pins and the

spring tension will then snap the latches onto the pins. The secondary support frame 30 also

includes a cross rail 34 as can be seen in Fig. 1.

Two pivotal connections are provided to connect the platform 18 to the secondary

support frame 30. These pivotal connections are pivotal connection 16C and pivotal

connection 16D respectfully as may be seen in Fig 1. These pivotal connections may be one

of several methods as is well known in the art of pivotal connections and therefore are not

specified in detail.

The platform 18 includes a pair of identical latch devices, set-up latch 24L and set-up

latch 24R. Set-up latch 24L is best shown in Fig. 2. While set-up latch 24R is not shown, it

is identical to and placed directly opposite set-up latch 24L on platform 18. Set-up latch 24L

and set-up latch 24R are both precisely shaped and placed so as to engage with pin 22L and

pin 22R, respectfully, when apparatus 10 is in the set-up position as can be seen in Figs. 1 &

2.

The platform 18 also includes a pair of devices, retainer 36L and retainer 36R, that are

slideably engaged to main frame support 20. Each retainer is shaped and sized so as to keep

platform 18 loosely connected to apparatus 10 when apparatus 10 is in the collapsed position

as well as provide adequate clearance to engage the set-up latch 24L and set-up latch 24R to

pin 22L and pin 22R, respectfully, during the set-up process.

The platform 18 contains a surface for which to affix the saw 12. This surface may be

formed of some rigid durable material of relatively low mass, such as but not limited to

plywood, particle board, or plastic. Other rigid materials fulfilling the specified requirements will serve the puφose of the surface as well. The platform 18 includes a setup handle 38. The setup handle 38 may be constucted

of one of many means so as to provide the necessary function. Preferably, it is connected to

platform 18 by means of a flexible tether, such as but not limited to, rope, string, cable or

wire. Other means of attachment as is well known in the art of attachment may also be used.

The apparatus 10 also includes a pair of wheels, wheel 42L and wheel 42R mounted proximate the pivot connection of platform 18 and secondary support 30.

Operation

The use and operation of the invention is as follows:

The operator uses out-feed work support 26 as a handle while in transit when

apparatus 10 is in transport mode as can be seen in Figs. 3 and 4 (i.e., the "collapsed

position"). When the operator wishes apparatus 10 to be set-up, he/she continues to hold out-

feed work support 26 with one hand and grasps setup handle 38 with the other. The operator

then places one foot on cross rail 34 and proceeds to pull setup handle 38 while simultaneously pushing cross rail 34 downward with foot. This process is continued until

both set-up latches, 24L and 24R are lifted up and over each of pins 22L and 22R,

respectfully, until set-up latches 22L and 22R are able to clear over pins 22L and 22R. The

operator then eases tension on setup handle 38 and cross rail 34 in such manner so as to

engage set-up latches 24L and 24R with pins 22L and 22R, respectfully. The set-up

operation is now complete and apparatus 10 is ready for use (i.e., it is in the "set-up

position"). In the set-up position, the handle on main frame support 26 resides at the same

height as the saw top to provide the out- feed support for the saw 12. To collapse apparatus 10, the operator simply reverses the set-up procedure.

Apparatus 10 will then be supported by wheels 42L and 42R and ready for transport and/or

stowage.

Accordingly, it can be seen that, according to the invention, an apparatus is provided

for the puφose of supporting and carrying a portable table saw. The invention is easy to use.

It is quick to set up and collapse for storage and possesses ease of mobility utilizing a set of

wheels. It provides a stable means of support which helps to provide a safe work

environment for the operator.

Although the description above contains many specificities, these should not be construed as limiting the scope of the invention but as merely providing illustrations of some

of the presently preferred embodiments of this invention. Various other embodiments and

ramifications are possible within it's scope. For example, the out-feed work support 26 may be adjustable in height so as to accomodate many different makes and models of saw 12.

This would provide for economical manufacture. The platform 18 may include "shim blocks"

to raise the height of saw 12. Other means and methods may be employed to substitute the

function of retainers 36L and 36R, as long as the method does not depart from the principles

of the invention. Various connection and latching means may be employed throughout that serve the necessary function without departing from the principles of the invention. In

addition, although the collapsible table is described with reference to a table saw, it should be

understood that the table could be used along with any type of tool (e.g., a cutting, sanding,

grinding, mitering or milling device) in which an out feed support is useful.

Claims

1. A collapsible stand for supporting a machining tool, comprising:

a lateral support structure for holding the machining tool; a secondary support frame having a first end pivotally attached to a first end the lateral

support structure; and a main support frame pivotally attached to the secondary support frame, wherein the

main support frame comprises a handle at a first end for transporting the stand in its collapsed

the stand is in its set up position.

2. The collapsible stand of claim 1, wherein the lateral support structure comprises a

platform.

3. The collapsible stand of claim 1, wherein the secondary support frame provides support to

the first end of the lateral support structure when the stand is in its set up position.

4. The collapsible stand of claim 1, wherein the secondary support frame folds beneath the

lateral support structure when the stand in its collapsed position.

5. The collapsible stand of claim 1, wherein main support frame provides support to a second

end of the lateral support structure when the stand is in its set up position.

6. The collapsible stand of claim 5, wherein the second end of the lateral support structure is

slidably engaged to the main support frame and includes a locking mechanism for securing

the lateral support structure to the main support frame.

7. The collapsible stand of claim 1, further comprising a pair of wheels attached proximate

the first end of the lateral support structure.

8. The collapsible stand of claim 7, wherein the stand collapses into a relatively flat

configuration such that the handle and pair of wheels reside at opposed ends of the stand.

9. The collapsible stand of claim 8, further comprising a release-able latch for securing said

stand in the collapsed position.

10. The collapsible stand of claim 1, further including a setup handle attached to a second

end of the lateral support structure for facilitating collapse and setup of the stand.

11. A collapsible stand for supporting a tool, comprising:

a lateral support structure for supporting the tool; and a main frame support having a handle for transporting the stand in a collapsed

position, wherein the handle provides an out feed support for the tool in a set-up position.

12. The collapsible stand of claim 11, wherein the main frame support includes a releaseable

locking mechanism for securing the lateral support structure to the main frame support in the

setup position.

13. The collapsible stand of claim 11, wherein the main frame support folds relatively

parallel to the lateral support structure in the collapse position.

14. The collapsible stand of claim 11, further comprising a secondary support frame with a

first location pivotally attached to the lateral support structure and a second location pivotally

attached to the main frame support.

15. The collapsible stand of claim 14, further comprising a wheel mounted proximate the

first location of the secondary support frame.