US2635657A

US2635657A - Method and apparatus for making screens

Info

Publication number: US2635657A
Application number: US223234A
Authority: US
Inventors: Henry J Dietrich
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-04-27
Filing date: 1951-04-27
Publication date: 1953-04-21
Anticipated expiration: 1970-04-21

Description

April 21-, 19 53 H. J. DIETRICH 2,635,657

METHOD AND APPARATUS FOR MAKING SCREENS Filed April 27, 1951 s Sheets-Sheet 1 FIG.

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firm/aways April 21, 1953 H. J. DIETRICH METHOD AND APPARATUS FOR MAKING' SCREENS Filed April 27, 1951 3 Sheets-Sheet 5 Have) d' U/ET'R/CH,

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Patented Apr. 21, 1953 orrlcr.

METHOD AND APPARATUS FOR MAKING SCREENS Henry J. Dietrich, Thermal, Calif. Application April 27, 1951, Serial No. 223,234

This invention relates to a method and apparatus for making screens, such as screen doors, window screens, and the like.

A primary object of the invention is to provide a method and apparatus whereby small woodworking shops equipped merely with a conventional circular saw or shaper may easily and quickly and economically manufacture the frames for screens from conventional wood stock.

More specifically, an object of the invention is to provide a method and apparatus whereby boards usually employed for this purpose and which are usually supplied by mills can be easily and quickly shaped and cut to enable them to be assembled into a screen frame providing a ledge or rebate on which the edge of the screen wire maybe positioned, and wherein portionsof the boards are saved and utilized as molding strips to be applied over the screen wire after the screen wire has been positioned.

With the foregoing and other objects in view, which will be made manifestin the following detailed description and specifically pointed out in the appended claims, reference is had to the accompanying drawingsfor an illustrative embodi ment of the invention, wherein:

Figure 1 is a sectional view through a portion of a conventional circular saw modified in accordance with the present invention, and illustrating the first step in the treatment of the edge of a board used to form a portion of the frame;

Fig. 2 is a view similar to Fig. l, but illustrating the succeeding step in the treatment of the board;

Fig. 3 is a partial View in vertical section taken substantially upon the line 33 upon Fig. 2 in the direction indicated;

Fig. 4 is a partial view in vertical section taken substantially upon the line 44 uponFig. 3, in the direction indicated;

Fig. 5 is a view similar to Fig. 1, but illustrating the manner in which the rails at the top and bottom of the screen frame are threaded in p the coping;

" manner in which the screen. wire is applied;

Fig. 8 is' a sectional view taken substantially upon the line 88 upon Fig. '7,'inthe direction indicated;

Fig. 9 is a view similar to Fig. 1, but illustrating a modified form of construction, the first step i of the-operationonaboard being'illustrated;

6 Claims. (01. 144-309) Fig. 10 is a View similar to Fig. 9, but illustrating the second step as being performed; and

Fig. 11 is a view similar to Fig. 9, but illustrating the manner in which coping i accomplished.

Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, the invention is particularly adaptable for use in conjunction with a conventional circular saw used in woodworking, although it is not restricted thereto but may be used on other pieces of apparatus such as shapers and the like.

For simplicity, the invention will be described in conjunction with a circular saw which usually has a saw table It beneath which there is a mandrel ll rotatable about a horizontal axis and which usually has mounted thereon the conventional circular saw blade. The table In usually has an opening therein occupied by a wooden filler strip I2 through which the upper port-ion of the circular saw blade projects. On top of the table It there is usually a saw guide l3 that is adjustable toward and away from the saw blade and this guide is usually equipped with a wooden facing strip l4.

In accordance-with the present invention a molding cutter indicated at I5 is mounted on the mandrel II and the circular saw blade [6 is also mounted on the mandrel against the molding cutter. A collar made up of circular discs or shims I! is also positioned on the mandrel to keep the hubs of the circular saw blade and the molding cutter inproperly spaced relation. On the molding cutter becoming worn, one or more of these shims may be removed from time'to time to keep the moldingcutter and circular saw blade in proper relation to each other. The circular saw blade, shims, and molding cutter are tightened against a shoulder [8 on the mandrel such. as by a nut 19. The opening in the filler strip or filler piece I2 is widened to accommodate the molding cutter at the side of the circular saw and the bottom of the facing strip 44 isrecessed to accommodate that portion of the molding cutter that passes above the top surface of the filler strip l2. 1

, The boards which are used to make up the frame for the screen are indicated at B. These boards are usually supplied from the mill finished on their opposite faces. Usually, however, the edges and ends of the boards are unfinished. Inundertaking to prepare the boards so that they will be suitable for assembly into a frame for the screen a board B is first passed over the rotating .circular sawblade andmolding cutter to form the stiles or the screen frame.

in a horizontal or flatwise position. In so doing, the board B is caused to slide rearwardly over the saw table while in engagement with the facing strip M. The shaping of the molding cutter and its arrangement with respect to the circular saw blade I6 is such that the saw blade IE will cut a relatively deep groove from the lower face of the board B toward the opposite face and spaced from the edge of the board that bears against the facing strip M on the saw guide. The horizontal portions of the edges indicated at 20 on the molding cutter l are ar ranged substantially flush with the top surface of the filler piece l2 and in the first step these horizontal portions of the cutter perform no cutting action. The curved portions 2i of the blades on the molding cutter, however, doround off the lower corner of the board and also take a very slight amount off of the edge of the board as indicated at 22 so as to finish the edge of the board adjacent the removed corner. A plurality of boards are caused to pass over the saw table as illustrated in Fig. 1.

When the first step is completed on each board the saw guide I3 together with its facing strip I4 is shifted outwardly slightly or into a position as shown in Fig. 2,- and the mandrel H is elevated slightly. A combined guide and support is mounted on the filler strip l2 at the left side of the circular saw blade and molding cutter. This combined guide and support is shaped as shown in Fig. 2 and is bolted by bolts 23 having countersunk heads onto the table. The projecting edge 24 is of such height as to support the board as it passes the circular saw and cutter, the board resting thereon on the upper side of the saw cut 26. The projecting edge 24 is of such thickness that it may readily enter the saw cut. I

With this slight change the boards are again passed over the saw table in engagement with the facing strip I4 but in this secondstep of the operation it. will be observed that the saw 16 cuts a longitudinal saw cut in the edge of the board indicated at 21 which intersects the saw out 26 therein in Fig; '1. This divides and separates the molded corner portion 28 of the board which is retained and subsequently used as a molding strip. As a means for keeping this molding strip from becoming broken due to vibration during the cutting operation an angular spreader formed of metal and indicated at 29 is fastened to the filler piece l2 behind the saw blade so that its vertical flange 30 is in direct alignment with the circular saw. This flange passes through the saw cut 21 and keeps the corner 28 from vibrating against the saw blade and from becoming damaged.

In the position shown in Fig. 2 it will be observed that the horizontal portions 20 of the cutting edges of the molding cutter finish the center portion of the edge of the board B. The curved edges 2! on the molding cutter round the other or opposite corner of the board and rebate it slightly as indicated at 3| a distance approximately equal to the thickness of the saw cut 21.'

These successive treatments of first passing the boards horizontally or fiatwis'e over the circular saw and molding cutter as shown in Fig. 1, and then over the circular saw and molding cutter as adjusted into the position shown in Fig. 2, complete the formationof the inner edges of the boards to form the screen frame. Two of such boards indicated at 32 and 33 may be utilized These boards have their inner edges rebated as previously described so that there are ledges 34 thereon against which the edges of the screen S may be positioned. Adjacent these ledges there are transversely extending grooves 35 so that the extreme edge portions of the screen can be bent therein on the application of a flanged roller 36 having a flange 31 that depresses the edge portion into the groove as shown in Fig. 8. Two other boards treated as previously described may be utilized as the top and bottom rails, respectively, indicated at 38 and 39. These boards are cut to length so as to fit between the stiles .32 and 33 and are then coped in order to fit the molded inner edges of the stiles. To accomplish this the circular saw blade 16 and the molding cutter i5 are removed from the rotatable mandrel II and a different coping cutter is substituted therefor. One such coping cutter is illustrated in Fig. 5 having a horizontal cutting edge 4]) that is spaced above the top surface of the filler piece I2 a distance corresponding to the distance that the rebate 3| is spaced from the edge of the board as shown in Fig. 2. The curved portion 4| of the coping cutter is shaped in conformity with that portion of the board B between the rebate BI and the groove 26. The board B in Fig. 5 is passed endwise over the coping cutter so that the ends of the rails are shaped as shown in Fig. 6, to properly fit between the tops and bottoms of the stiles. The rails and stiles may be secured together in any suitable or preferred manner and the screen wire S is then positioned over the ledges 34 on the stiles and railsv Its edge portions are depressed in the groove 35 by the fianged roller 36.

The cut off corners 28 of the boards are preserved and those out ofi corners of the rails are mitered at their ends and are reapplied to the rails. The cut off corners of the stiles are shortened so as to fit between the rails and have their ends mitered and are reapplied to the stiles. These molding strips provided by the cut off corners may be vsecured in position in any suitable or preferred manner and as the design for the molding cutter i5 is such as to allow for the same, the molding strips when applied will fit within the right angle rebate and assume positions flush with the molded inner edges of the boards, thus completing the screen.

In Figs. 9, 1i) and 11 a similar method and apparatus to that previously described is disclosed except that the molding cutter and coping cutter have been combined together. In this form of construction the blades of the combined molding and coping cutter indicated at 43 are so formed that the left-hand portion of the blade that is between the point 34 and the circular saw blade 25 conforms to the corresponding portion of the molding cutter 15. The right-hand portion of each blade, that is the portion between the point 44 and the point 46 conforms in shape to the coping cutter illustrated in Fig. 5. Other than having the molding and coping cutters combined together, the method is substantially the same as previously described. The boards are first passed flatwise over the table so asto be acted upon by the circular saw blade 45 and the left-hand portion of-the cutter 43. In so doing, the first step of the operation performed on the boards is accomplished in very much the same manner as illustrated in Fig. 1. Thereafter, the block 23a, together with its projecting edge 24, is applied to the table and the spreader 29 may be applied. Usually, however, the spreader is allowed to remain on the table at all times as the spreader merely passes through the saw cut out by the circular saw blade. The second operation on the boards is as depicted in Fig. 10, wherein the saw guide is shifted outwardly a slight distance and the mandrel II is elevated to elevate the cutters. The boards are passed over the cutters in a vertical or edgewise manner to complete the molding of the inner edge of the boards and to shape the lower corner which is ultimately to be used as a molding strip. Those boards which are to be used as rails are passed over the cutter in an endwise fashion to utilize that portion of the cutter between the

points

44 and 46 which shapes the ends of the rails so that they may fit with the molded inner edges of the stiles. It is advisable to remove the circular saw 45 when this operation is performed, and consequently the saw is not shown in Fig. 11. However, this is not essential inasmuch as the ends of the rails in this operation pass over a portion of the cutter 43 remote from the circular saw.

While the invention has been described in conjunction with a circular saw having a horizontally rotatable shaft or mandrel II that is vertically adjustable, it will be appreciated that it is not restricted thereto but may be used on other forms of woodworking equipment such as shapers or devices having rotating shafts rotatable about vertical axes and on which the cutters and saw blades are capable of being mounted.

Various changes may be made in the details of construction Without departing from the spirit and scope of the invention as defined by the appended claims.

I claim:

1. An apparatus for making screen frames comprising a circular saw table, an adjustable rotary shaft therebeneath, a molding cutter and a circular saw blade on the rotary shaft in side by side relationship, a saw guide on the table disposed on one side of the saw blade and cutter, and a guide strip on the table disposed at the side of the blade and cutter in opposed relationship to said saw guide, said guide strip having a thin projecting edge projecting toward the saw guide on the table and adapted to slidingly support a board before and after it has traversed the blade and cutter.

2. An apparatus for making screen frames comprising a saw table, an adjustable rotary shaft mounted in underlying relationship to said table, a rotary saw blade and molding cutter on said shaft in side by side relationship, a saw guide mounted on said table and disposed on one side of said saw blade and cutter, and a guide strip located on said table at the side of said saw blade and cutter in opposed relationship to said saw guide, said guide strip having a projection thereon extending toward said saw guide adapted to support a board before and after it has traversed the blade and cutter, said projection being parallel to the surface of the table.

3. An apparatus for making screen frames comprising a saw table, an adjustable rotary shaft mounted in underlying relationship to said table, a rotary saw blade and molding cutter on said shaft in side by side relationship, a saw guide mounted on said table and disposed on one side of said saw blade and cutter, a guide strip located on said table at the side of said saw blade and cutter in opposed relationship to said saw guide, said guide strip having a projection thereon extending toward said saw guide adapted to support a board before and after it has traversed the blade and cutter, said projection being parallel to the surface of the table, and a spreader on said table located behind the saw for receiving said board and prevent material partially cut therefrom from vibrating against said saw blade.

4. An apparatus for making screen frames comprising a saw table, an adjustable rotary shaft mounted in underlying relationship to said table, a rotary saw blade and molding cutter on said shaft in side by side relationship, a saw guide mounted on said table and disposed on one side of said saw blade and cutter, a guide strip located on said table at the side of said saw blade and cutter in opposed relationship to said saw guide, said guide strip having a projection thereon extending toward said saw guide adapted to support a board before and after it has traversed the blade and cutter, said projection being parallel to the surface of the table, and a spreader on said table located behind the saw for receiving said board and prevent material partially cut therefrom from vibrating against said saw blade, said spreader being L-shaped and having one leg perpendicular to the surface of the table.

5. An apparatus for making screen frames comprising a saw table, an adjustable rotary shaft mounted in underlying relationship to said table, a rotary saw blade and molding cutter on said shaft in side by side relationship, a saw guide mounted on said table and disposed on one side of said saw blade and cutter, a guide strip located on said table at the side of said saw blade and cutter in opposed relationship to said saw guide, said guide strip having a projection thereon extending toward said saw guide adapted to support a board before and after it has traversed the blade and cutter, said projection being parallel to the surface of the table, and an L-shaped spreader on said table located behind the saw, said spreader having one leg parallel to and in alignment with the cut made in the board by the saw blade for receiving said board and prevent material partially cut therefrom from vibrating against said saw blade.

6. The method of making screen frames which comprises simultaneously longitudinally grooving and arcuately contouring boards that are to form the stiles and rails of a screen frame from end to end thereof along one side face of each board adjacent an edge thereof, simultaneously longitudinally grooving, notching and arcuately contouring each board from end to end on the mentioned edge with a groove that intersects the mentioned groove thus cutting molding strips from the boards, and simultaneously grooving and arcuately contouring the ends of the boards that are to become rails complementary to the shape of the mentioned edges on the stiles resulting from cutting the molding strips therefrom.

HENRY J. DIETRICH.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 508,309 Hall Nov. '7, 1893 782,088 Ward Feb. 7, 1905 783,946 Gregory Feb. 28-, 1905 932,373 Burns Aug. 24, 1989 1,614,720 De Penning Jan. 18, 1927 1,792,762 Rockwell Feb. 1'7, 1931