US1394499A - Jointer-guard - Google Patents

Description

P. C. INGSTRUM.

JOINTER GUARD.

APPLICATION FILED MAY I1, I920.

1,394,499, 9 Patented Oct. 18, 1921.

2 SHEETS-SHEET I.

- L K C 20 INVENTOR WITNESSES 12 I :PJzmeasGfiysZram,

9 amm m WV W 1% ATTORNEYS.

PVC. INGSTRUM.

10mm GUARD.

APPLICATION FILED HAY H, 1920.

Patented 0091s, 1921.;

2 SHEETSSHEET 2.

ATTORNEYS.

UNITED STATES PATENT OFFICE.

vIPHINEAS C. IN GSTRUM, OF ROCHESTER, NEW YORK.

JOINTER-GU'ARD.

To all whom it may concern:

Be it known that I, PHINEAS C. INGSTRUM, a citizen of the United States of America, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in J ointer- Guards, of which the following is a full, clear, and exact specification.

My invention relates to safety guards, and more particularlyto guards for woodworking machines, being designed to protect the hands of an operator of the machine; or others, from the cutting knives; and it has for its object to provide a guard which is adjustable to various sized machines; a further object is to provide a guard which projects a minimum distance from the frame of the machine, both beyond the front andabove the table thereof. Another object is to provide a guard, the parts of which are made interchangeable and ad uStable relative to each other, so that parts may be used on machines having long or short cutting knives. A still further object is to provide a guard which will always remain in its protective position, covering the cutting knives when the machine is at rest and operating, and one which will cover all of the knives which are not actually cutting the wood when the machine is running, and a still further object is to provide a guard with a combined toggle arm and cam operating device, so that the guard'will move with very little force applied through the work. To these and' other ends the invention resides in certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out in'the claims at the end of the specification.

In the drawings, in which like reference characters designate like parts throughout:

Figure lis a perspective view of a jointer guard constructed in accordance with and illustrating one embodiment of my invention; r a f Fig. 2 is a section through one section of the guard and base of the device shown in Fig. 1, showing-how the parts telescope, parts being omitted for clearness;

Fig. 3 is a detail of the latch used on the same machine for holding the sections in the desired relation; 7

Fig. i is a perspective of anotherembodiment of my invention;

Fig. 5 is side elevation of the guard shown in Fig. 4; i

Specification of Letters Patent.

Application filed. May 11,

Patented Oct. 18, 1921.

1920. Serial No. 380,627.

Fig. 6 is an end elevation showing a base equipped with wide tracks, a part being broken away; and

F 1g. 7 is a bottom plan of the end section of F 1g. 1 on the single section of Fig. 4, illustrating the toggle arm which moves the hands from these knives there is a guard,

composed of telescoping sections 6, 7 and 8 in the embodiment shown in Fig. 1 of the drawings. Sections 6 and 7 are provided with grooves 9 and 10 on the outside of clownwardly extending flanges 11 and 12, these flanges also being provided on the inside with ribs or tracks 13 and 14. Theend section 8 has grooves 9 and 10 on the outside of flanges 11 and 12, but the inner tracks are omitted. These sections can slide, therefore, one on the other, so that they are adjustable to vary the length of the entire guard between wide lim its;

In order to hold the parts in the desired relatlon, so as to move as one unit, sections 7 and 8 are provided with a series of apertures 10. The ends of sections 6 and 7 are provided with spring latches 4 .1 and 12 which are 45 adapted to fit in an aperture 10, as shown in Fig. 3.

Section 6 is mounted upon a base which consists of a casting 13 having rails or tracks 1% and 15 adapted to enter the slots or grooves 9 and 10 of section 6. Casting 18 is provided on one side with an ear 16 which forms a bearing to slide on a shaft 17, there being a set screw 18to hold the parts in the desired relation. Shaft 17 is supported in a two-way bearing 19 carriedby a rod QOpermanently attached to the jointer' at 21. A hand wheel 22 is provided in one side of the bearing 19 so that the bea'ring may be moved to and from the jointer and easily adjusted as desired. A second set screw 23' on the bearing makes an additional vertical adjustment.

'It is obvious that hand wheels or other means may be used to hold these parts in the desired relation in the place of set screws, if desired. In large guards, as shown in Fig. 1, it'is better to have two supports, so on the opposite side casting 13 is providedv with another ear (not shown) in which a rod 27 ismounted, there being a two-way bearing 29 sliding on a rod or shaft 30 affixed to the jointer frame at 31. In this case the hand wheel 32 is on the side through which rod 27 passes, and the set screw 33 holds upon shaft 30. If desired,set screws 18 and the corresponding one on the otherside, which is not shown, may be set, and screws 23 and 33 loosened, so that hand wheels 22 and 32 will control the vertical and horizontal adjustments of the base. I have found in'practice that this is sufficient to hold the parts firmly. Casting 13 is also provided with a small roller or pulley 50 ,suflicient distance for the lumber to pass,

see Fig. 5, the end section 8 isprovided on its under side with a toggle arm 60, mounted to turn on a pivot. 61 fastened to section 8, and held in a positionto one side of the guard by a spring 62 attached to the toggle arm with, a screw 63 and to the guard section 8 with a screw 63. Toggle arm 60 has a cam head 68 on its outer end, curved to form a lumber contactingprojection. The downwardly extending flange 12 is cut away forming an opening 64: through which the toggle arm 60 passes, and also forming a stop 65, limiting its outward movenient. One end of section 8 is cut to form a vcam 66, while the end 67 is flattened where it rests against the guard 2 on lumber L,

Then a board L to be edged is moved along guard 2, it first strikes the cam head position shown in L is'reached, just beyond which the cam'surfac'e 66 causes the section 8 tomove still farther back (in praccam head 6,8,allowing toggle arm 60 to return to its initial position. It should be noted that there is no camming action of board L upon head 68 until the'guard has been moved back the greater part of the necessary distance, so that the first part of the rearward movement of guard 8 is caused by toggle arm 60 rotating and at the same time pushing upon its pivot 61. By making the cam head 68 long, boards of considerable width may be edged without adjusting the guard. This toggle arm action against the weight pressure works very smoothly and easily, much more power being obtained throughits' use than when a cam surface alone isused, so that very little force is necessary to move these parts and, with them, the guard.

Where a long timber is to be edged, it is sometimes desirable to lay the portion to be cut on the knives without running it through the machine, thereby first bringing one end into contact with lever 60. I, therefore,prefer to equip the end section .8 with a cam plate 70 so that by lowering aplank upon the table 1 against gage 2 the guard 8 will be cammed against the weight action.

The-guard may be left normally at a suflicientelevation from the table 1 fora board B being planed to pass beneath, or may be adjusted for this purpose, according to the nature of the work. 7

In Fig. 4 I show my guard adapted for use on the smaller, sized machines. Since the base is similar to that shown in Fig. 1 excepting that a single support is used, and the guard is the same as. section 8 of the guard in Fig. 1, the same reference characters are used.

I contemplate providing a guardwith a series of sections, so that a section, when purchased, may be used for a small guard alone, or as a section of a large one. For this purpose the base or casting 13, if desired, may be furnished in one size, with the rails 14 and 15 of various sizes to fit different width sections. Fig. 6 illustrates a base 13 with rails 141 and 15.of sullicient width for section 8 of Fig. ,1' toslide as a one-sectionv guard. Any combination desired can, therefore, be made up. 1

All of the guard sections are made with a curved, relatively smooth outside contour, so as tobeclose to the table lwhen adjusted for edging lumber, and be of as little hin-' drance to the workmen as possible, while at the same time affording the greatest possible protection; the cutter being covered automatically all the time, either by the guard or by the guard and lumber.

Having thus described lily-invention, what I claim as newand desireto secure by Let- .7 tersPatentis: r two this being only about one-siXteenthof-an inch), thereby releasing the pressure on 1. In machine having a rotary cutter mounted on a table and projecting through a slot therein, the combination with a guardhaving a cam end and normally covering the slot, of a toggle pivoted to the the toggle arm being adapted to move the guard,

guard as the work is fed toward the cutter lnto a position where the work will come in contact with the cam end on the guard.

2. In a machine having a cutter mounted on a table and operating through a slot therein, the combination with aguard normally covering the slot, the guard being slidably mounted relative to the table, a

cam surface on one endof the guard, and a toggle arm pivoted to the guard, the toggle arm moving the guard by rotating about its pivot as it is engaged by work being fed to the cutter, and the guard cam completing the movement of the guard as the cam is engaged by the work.

3. In a machine having a cutter mounted on a table and projecting through a slot therein, the combination with a guard slidably mounted over the slot, and having a cam on its end, of a toggle arm pivoted to the guard, a spring for holding the toggle arm in one position, the toggle arm moving the guard a portion of its travel as work is fed to the cutter, the cam completing the travel of the guard, the toggle arm returning to its initial position as the cam receives the contact of the advancing work.

t. A knife guard for a jointer machine, comprising a base upon which a guard is slidably mounted, means tending to hold the guard over the knife, a toggle arm pivoted to the guard for moving it against the first mentioned moving means as work is fed toward the knife, and means carried by the guard for completing the movement of the guard started by the toggle arm.

5. In a machine having a knife mounted on a table and operating through a slot therein, and a work gage on the table, the combination of a guard .adapted to slide over the slot, means for keeping one end of the guard against the gage, means for moving the guard from the gage as work is advanced to the knife comprising a toggle arm pivoted to the guard, and means on the guard to space the guard from the gage a distance equal to the width of the work being advanced to the knife.

6. In a machine having a knife mounted on a table and operating through a slot therein, and a work gage on the table, the combination of a guard adapted to slide over the slot, means for keeping one end of the guard against the gage, means for moving the guard from the gage as work is advanced to the knife comprising a toggle arm pivoted to the guard, the toggle arm being spring pressed into the path of work bein advanced to the knife, means on the guard for spacing the toggle arm from the work, thereby allowing the toggle arm. to return, impelled by the spring, into the path of the next piece of advancing work.

7. In a jointer guard, the combination With a base, a slot in the base, and a knife guard mounted abovethe knife, means for thrusting the guard across the knife, and a a toggle arm for moving the guard against the guardunoving means, said toggle arm being movable in; one direction by a spring independent of the guard moving means.

8. In a jointer guard, the combination with a base, :aslot in the base, and a knife operating through the slot, of a slidable guard to protect the knife, means normally tending to hold the guard across the knife, a toggle arm associated with the guard and movable with the guard in one direction and movable independent of the guard in the other direction.

9. I11 a jointer guard, the combination with a slidable guard mounted on a jointer machine, of a cam upon the end of the guard, a toggle arm pivoted to the guard normally extending to one side at an angle from the guard, the toggle arm moving the guard when lumber is brought into contact therewith until the toggle arm is substan tially parallel to the guard, the guard cam then being contacted by the lumber to move the guard farther, permitting the lumber to ass.

p 10. In a machine having a rotary cutter mounted on atable and projecting through an opening therein, a guard normally covering the opening, the guard being mounted to slide relative to the table, a weight impelling the guard in one direction, a toggle arm pivoted to the guard having an operative and an inoperative position and having a work contacting head projecting forwardly from the end of one side of the guard, a spring for holding the guard in operative position,-the guard being moved by the toggle arm when work engages the toggle arm, thereby rotating the toggle arm about its pivot into an inoperative position, the guard being engaged by the work and moved thereby so that the spring may return the toggle arm to its operative position.

11. In a machine having a rotary cutter mounted on a table and operating through a slot therein, of a guard normally covering the rotary cutter, agage on the table, a slideway for the guard and means for keeping one end of the guard in contact with the gage, means for moving the guard from the gage, comprising a toggle arm pivoted to the guard extending normally at an angu lar relation thereto and projecting from one side of the guard near the gage, so that it will contact with work being advanced to the cutter across the table.

12. In a machine having a cutter mounted on a table and operating through a slot therein, of a guard movable over the cutter, means for holding, the guardnormally over the cutter, and means for moving the guard against the first mentioned moving means,

i to,the toggle armhaving an operative and an inoperative position with respect to said cutter and isoontacted with the work concutter.

tactinglhea'd, theangi'llar relation between 10 the guard and toggle arm will decrease as the guard moves. until the toggle arm becomes inoperative by the work passing the Signed at Rochester New York, this 7th 15 day o f May, 1920. guard, so that as work is advanced to the V PHINEAS o. INGSTRUM.

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