US2335783A - Miter box - Google Patents

Description

C. F. MILLS Nov. 30, 1943.

MITER BO X Filed Feb. 27, 1941 4 Sheets-Sheet 1' Nov. 30, 1943.

C. F. MILLS MITER BOX Filed Feb. 27, 1941 4 Sheets-Sheet 2 E -H HHHHH H Z C. F. MILLS MITER BO X Filed Feb. 27, 1941 4 Sheets-Sheet 5 I125 -lli- 6'. It'll 1111s.

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Nav. 30, 1943.

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MITER BOX Filed Feb. 27, 1941 4 Sheets-Sheet 4 IIIIIIIIIIIIII (IE/Wills.

Patented Nov. 30, 1943 UNITED STATES PATENT OFFICE 2,335,783 MIT IER' BOX Charles Francis Mills, Port Arthur, Ontario,

Canada- 7 Application February 27, 1941, Serial No. 380,856

1 Claim. (01. 14389) My invention relates to improvements in miter cutting machines, an object thereof being to provide a device of the character herewithin described capable of universal movement within a wide are.

A further object of my invention is to provide a device of the character herewithin described by means of which accurate miters may be cut over a wide variety of angles.

A further object of my invention is to provide a device of the character herewithin described which is quickly adjustable, and in which the saw can readily be placed out of the way of the work.

A further object of my invention is to provide a device of the character herewithin described which is suitable for use in confined location and onto which a board of any length and width (within practicable limits) may be placed.

A further object of my invention is to provide a device of the character herewithin described which is simple to manufacture and which will therefore sell to the trade at a reasonable figure, which is rugged and which cannot easily become out of order.

With the above more important objects in view and such other minor objects as may appear as the specification proceeds, my invention consists essentially in the arrangement and construction of parts all as hereinafter more particularly described, reference being had to the accompanying drawings, in which:

Figure 1 is a side elevation showing the first embodiment of my miter cutting machine with the saw-holder thereof elevated.

Figure 2 is a perspective illustration of the depth and rear wall thereof.

Figure 3 is a section approximately in the direction and between the limits of the arrows 3-3 of Figure 1.

Figure 4 is a section on the line l4 of Figure 1.

Figure 5 is a perspective detail illustrating a portion of the journalled post in my first embodiment and showing the rear side of the upstanding wall.

Figure 6 is a side elevation of the embodiment of my invention illustrated in Figure 1 but showing the saw-holder in lowered position.

Figure '7 is a plan detail viewed in the direction of and between the limits of the arrows ll.

Figure 8 is a section on the line 8-8 of Figure 7.

Figure 9 is an elevation as seen in the direction of and between the arrows 9-9 of Figure 6.

Figure 10 is a plan View of the embodiment of my invention illustrated in the foregoing figures.

Figure 11 is a perspective detail illustrating my means for releasing my divided link from the post.

Figure 12 is a side view of an alternative embodiment of my miter cutting machine.

Figure 13 is a section on the line iii-l3 in Figure 12.

Figure 14 is a section on the line i i-M in Figure 13.

Figure 15 is a section on the line |5--i5 of Figure 13.

Figure 16 is a section on the line Iii-l6 of Figure 13.

Figure 17 is a side elevation of the embodiment of my invention illustrated in Figure 12 but showing the saw-holder in lowered position.

Figure 18 is a plan view of the embodiment of of my invention illustrated in Figures 12 and 17.

Figure 19 is an end view in the direction and between the limits of the arrows l9l9 in Figure 17.

Figure 20 is a section on the line 20-26 of Figure 17.

Figure 21 is a section on the line 2 i2i of Figure 20.

In the drawings like characters of reference indicate corresponding parts in the difierent figures.

Describing first the embodiment of my invention illustrated in the accompanying Figures 1 to 11, inclusive, it will be seen that my miter cutting machine comprises a deck I mounted on the legs 2 and bounded along the rear edge only by the rear wall 3 which is divided in the centre as at 4 in accordance with conventional practice.

Joumalled on a stud which projects through the aperture 5 (Figures 2 and 5) is a post 5, which, in this embodiment of my invention is seen to be curved upwardly and vertically, or longitudinally slotted as at l. Extending forwardly under the deck I and integral with the post 6 is radius arm 8, the same rotating in a horizontal plane with the post.

Secured to the underside of my deck I and projecting forwardly from the front edges 9 thereof is a notched quadrant l9 and by reference to the accompanying Figures 7 and 8 it will be seen that I have provided a trigger it which engages the notches of the quadrant on actuation of the finger-piece [2. From these figures it will be seen that I provide an aperture !3 in the forward end of the radius arm, in which the trigger l2 may move against the resistance of a spring l4 positioned in a recess in the radius arm. The portion I 5 connects the parts II and l2, downwardly projecting buttress l6 bearing against one end of the spring M, the device a a whole being held in place by the plate I! which is suitably secured as by means of screws, to the radius arm upon either side of the trigger detail which I have just described.

The upper end of the post 6 will be seen to terminate in the circular bearing head l8, reference in this connection being particularly directed to Figures 1 (or 6) and Figure 10 from which it will best be seen that a slotted link I9 is rotatably connected to the end of the post 6.

The slot 23 in the link, separates the two parts 21 and 2| thereof for the whole length of the link, these two parts terminating in the bearing head 22 similar to the bearing head [8. Each of the bearing heads I8 is secured by means of one of the studs 23 to one or other of the bearing heads 22 and thus it can be seen that a slot extends all the way from the lower end of the post 6 to the opposite end of the link 9 for the reason later to be described.

The opposite end of the link I9 also terminates in a pair of bearing heads 24 and through these extend a pin 25 to connect, rotatably, the end of my saw-holder 26 to the link l9.

The saw holder normally extends forwardly over the deck I, being designed to hold thesaw 21 in any desired position. It will be seen that the member 26 consists of two pairs of slotted guides, one pair being enumerated 28 and the other 29 (see Figure 9). These are connected by the open portion 38 which is designed to receive the stiifened edge of the saw which would enter through the aperture 3| best seen in th accompanying Figure 9 while the blade itself would move in the slot 32. The member 29, being of the same configuration, it will not be defined in detail, being clearly illustrated in the accompanying Figure 4.

It is necessary to provide means whereby my saw holder can be maintained in the elevated position of Figure 1 when not in use and for this reason I provide the details best illustrated in the accompanying Figures 1, 3, and 11 from which it will be seen that a rod 33 right-angled at the front end thereof as at 34 (Figure 9) is held in brackets 35 and 36 at the ends of sawholder. The rear end of the rod is angulated at 37 in the same direction as the portion 34 while the extreme end is angulated again back into the direction of the rod itself as at 31. A spring 38 is connected between the saw-holder and a, projection 39 suitably connected to the rod and normally the end 34 of the rod is horizontal as illustrated in the accompanying Figure 9.

Secured alongside the link [9 is a latch 40, the end 4! of the latch being designed to engage a notch 42 in one of the bearing heads l8. The opposite end of the latch is provided with an eye 43 of the configuration best illustrated in the accompanying Figures 3 and 11 through which the end 37 of the rod 33 is designed to extend. The spring 44 is designed to urge the latch in th direction of the arrow 45 (out of engagement with the notch 42).

When the saw-holder is lowered as in the position shown in the accompanying Figure 6, the end 39 of the rod is separated from the eye 43 and it only enters the eye when the saw-holder is in the elevated position of Figure 1. Then, upon rotation of the rod via the end piece 34 (Figure 9) in the direction of the arrow 45, the end portion 31 rotates similarly in the eye 43 and passes the latch downwardly against the resistance of the spring 44 into the notch 42. The latch is held in such position, and similarly, the rod 33 is prevented from rotating backwardly again by the spring 33 which will be slightly beyond dead centre because of the small U-shaped link 46 which divides the spring into two parts and enables it to straddle the rod 33.

In the accompanying Figure 2 it will be seen that I have provided a member 4! which is secured to one corner of the deck I by means of a wing-nut 48. This member is provided with an elongated slot 49 so that it can be adjusted into many position in the one plane by means of the -the wing-nut 13 which projects wing-nut and the member terminates in the projecting portion 50 to provide a very useful accessory at each end of the deck for holding a piece of material in place on the deck.

Finally, in connection with the first embodiment of my invention I would draw attention to the gauge rod 5i which is secured by means of the wing-nut 52 (Figure 5) to the post 3 and can move within the limits of the slot 53 in a single vertical plane. The upper end 55 of this member is designed to bear against the portion 33 of my saw-holder, just a little to one side of the position occupied by the saw blade. By its use I am able to limit the depth of a cut in a piece of wood being formed, since it is well known that it is not always desired to out completely through a piece of wood but sometimes only a certain depth.

Referring now to the embodiment of my invention illustrated in the accompanying Figures 12 to 21, it will be seen that here my machine is somewhat simplified over the first embodiment but has certain limits in its movement. This embodiment comprises the same deck l, legs 2 and rear wall 3 and also has a similar notched quadrant l0 although the remaining parts differ as I will now proceed to explain.

The post 55 of this embodiment is secured at its lower end to the radius arm 53, the radius arm being journalled in a stud 57 which extends through the deck in the projecting portion 58 thereof between the sides of opening 39 (Figure 18). The post is provided with a slot 66 right to the top end thereof.

Upon each side of the post and at right angles to the plane of the slot are tracks 6| to act as keyways for a pair of diametrically opposed keys 62 projecting inwardly from a sleeve 63, these keys preventing the sleeve from rotating without the post. Projecting forwardly from the sleeve is my saw-holder 64 having a downwardly projecting saw-blade guide 65 of the configuration clearly illustrated in the accompanying Figure 19, and a rear guide 36 integral with the sleeve 53 and best illustrated in the accompanying Figures 12, 13, 14.- and 17 from which it will be seen that the slot 61 of the guide is constantly in alignment with the slot Bil in the post 55.

The sleeve is prevented from lifting out of the post by means of the cap 33 and in this embodiment also I provide a gauge 63 to serve the same purpose as the member 5i in the first embodiment of my invention, or in other words, to limit the depth of a saw cut in a piece of wood-on the deck I, this gauge consisting of a strip of metal 10 angulated inwardly as at 'H to bear against the surface 12 (see Figure 13).

The piece of metal iii is adjusted by means of outwardly through one side of the sleeve 63 and in this way I am able to provide a simplified and peculiarly effective gauge for the purpose just described.

To maintain my saw-holder in the elevated position of Figure 12, it will be seen that I provide the rod 14 which is positioned in bearings 15 and I6 on the saw-holder. A finger-loop 11 is provided at one end of the rod while the rear end 18 is double-angulated so that the extreme end thereof 19 will act as a hook on the cap 68.

The detail for holding my radius arm 66 in the various notches of the quadrant I!) is best illustrated in the accompanying Figures 20 and 21, the detail being substantially similar to that of my first embodiment (Figures '7 and 8) and will be seen to consist of the pointed trigger-teeth 80 and the finger-teeth 8| together with a downwardly projecting buttress 82 designed to bear against a spring 83 situated in the recess 84, the trigger being held in place by the plate 85 which may be screwed down to the radius arm on either side of the trigger.

Since many modifications can be made in th invention herein described and since the accompanying drawings have been prepared only to illustrate the relative arrangement and interaction of parts and not with regard to accuracy of dimensions for manufacturing purposes which in view of this disclosure I consider to entail merely mechanical skill together with the skill of the mechanical draftsman, and since many apparently widely difierent embodiments of this invention may be made within the scope of the accompanying claims without departing from the spirit and scope of the same it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense and I desire only such limitations placed thereon as justice dictates.

What I claim as my invention is:

A miter box characterized by having a deck and an upstanding rear wall, a post slotted in a vertical plane, said post being journalled at the rear of said wall, a slotted link rotatably connected to the upper end of said post by means of two pairs of bearings separated from each other by the width of said slot so that said slot extends uninterruptedly between said post and said link, a saw holder pivotally connected at the upper end of said link, said saw holder normally extending forwardly over said deck, said post and said saw holder rotating as a unit in a, horizontal plane, said saw holder and said link being rotatable in a vertical plane, means for maintaining said saw holder in an elevated position, comprising a cranked rod journalled for rotation on said holder and extending parallel therewith, a longitudinally movable latch secured to said link and extending longitudinally therewith, said rod engaging said latch when said holder is in elevated position, and being capable of moving the same longitudinally into engagement with a recess in one of said posts.

CHARLES FRANCIS MILLS.

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