US1415790A - Mortising machine - Google Patents

Description

G. W. CAMPBELL. MORTISING MACHINE.

APPLICATION FILED nmao, 1920.

Patented May 9, 1922.

UNITED STATES PATENT OFFICE.

GEORGE W. CAMPBELL, OF COLUNFBUS, OHIO.

. MORTISING MACHINE.

To all whom it may concern:

Be it known that Gnonon W.

Columbus in the county of Franklin and State of hi0, have invented a certain new and useful Improvement. in Mortising Machines, of which the. following is a specification.

The present invention relates to the kind ofmachine shown and described in the patent issued to me 1,289,114, and has for its object to simplify and cheapen the construction of such machine and promote the ease and efiiciency of its operation. he invention is embodied in the example herein particularly shown'and described, the

features of? novelty beingfinally claimed.

In the accompanying drawing, Figure 1 is a side elevation of the machine according. to my presentimprovements.

Fig. 2 is a sectional (lBtaIlVlGW on a large scale of means clutch shifting lever.

1g. 3 is a sectional detail of the tool and tool carrier feeding element.

. I 4 is a partial detail in side view of the shiftable bar. i

ig. 5 is a view looking at the right hand side of what is shown in Fig. 4: with the means for compressing the springs of the clutch shifting lever added.

The cut re erred to includes guide rods 1 and 2 connected together at one end by a handle portion 3 and at the otherend by a cross bar 4 the u per and lower ends of which are provided with suitable clamps 5 for attaching the machine to the door or other object} to be ,mortised. The carriage for the operating parts is slidably mounted upon the guide rods 1 and 2 and consists of side pieces 6 and 7, a rear connectlngpiece 11, forward connecting piece 9 and Intel" mediate cross piece .8, the carriage being provided with laterally extending bosses 12 that are sleeved upon the guide rods 1 and 2.

Journaled in thecross piece 11.. is a shaft 14to which is connected the main operating wheel 15, and pivoted upon said shaft l4; is an oscillatin arm 17 carrying the tool holder 18. T e tool shaft 19 is pinned at 18 in the holder 18 so as to becapable of rotation therein. The tool 19 is removably screwed into the forward end of the tool shaft. The forward end of the oscillating arm 17 is Specification of Letters Patent.

December 31, 1918 No..

1 threaded portion of the sore actuating and latching the resent machine as in my former pat- Patented May 9, 1922. 434,022.

made with a housing 17 within whichis located a pinion 2O pinned to the tool shaft.

The pinion 20 is 111 mesh with the teet-h 2l ways 27 integrally formed with the tool holder 17.

Loosely mounted upon an un It 23 are beveled gears 28 and 29 to said unthreaded portion of the screw between these gears is a clutch member 30 arranged to be shifted along the spline so as to be thrown into engagement with either one of the gears as in my former patent referred to. A beveled pinion 35 is in mesh with both the gears 28 and 29 and has its shaft journaled in the frame of the carrier, the opposite end of the shaft being provided with a pinion 36 (shown in dotted lines in Fig. 1) in mesh with the internal gear teeth 37 operating wheel so that as said wheel is operatcd the gears 28 and 29 will be operated in opposite directions. to the carrier frame at 40 is a shiiting yokelike lever 39, one arm ll of. which engages the grooved clutch collar 30. Said yoke-like lever carries a rod upon which slides a spool 1-7 and interposed between said spool and the ends of the yoke-like lever are coil sprin t8 and 49 either of which is adapted to be placed under compression when the spool is shifted against it. Tl

initially tilted 1 so upon the compression of one of the springs 4-8 and he movement of the spool 47 which is connected with and actuated by a fork 50 on a beveled projection 51 on tl'ieshiftable bar 57. Means for preventing the oscillation of the lever 39 until the proper spring is fully compressed con sists of two pivoted latches 52 and 53 each of which is provided with shoulder 54 and a beveled portion 55. When the, lever is shifted to one position the shoulder on one of the latches will engage the projection 56 and retain the lever in its shifted position. The lever 39 will ordinarily be held in this position until extreme limit of its movement, but will be finally released by the beveled projection 51 operating wheel 15 so that Pivotally connected the shifting device 57 is near the "39 and after the apices pass gageduntil the yoke coming in contact with the inclined portion of the latch which forces the latch out of engagement with the projection on the lever after the corresponding spring has been placed under compression by the movement of the bar 57 The spring then quickly shifts the lever so as'to throw the clutch 3O fromone gear to the other, the latch being at the same time returned to normal latching position by a spring (53. The shifting of the bar 57 to accomplish this begins to take place near the end or each oscillatory movement of the tool holder as in my former patent. But in the present instance the side of the yoke-like lever is provided with a beveled projection 89* extending at right angles to the plane of its oscillation and upon the frame is a socket member 7 having a spring held plunger pin 80 beveled at its end to co-act -with the beveled projection 39. When aspring 48 or 49 is compressed the plunger pin 80 rides up one side of the pin the opposite side acts to throw the yoke to full clutching position and holds the clutch securely enlever is similarly actuated in the opposite direction. The slidable bar 57 as in my former patent has rotat- P sleeves 59 and 60 ably mounted thereon a screw 58 one half of which is provided with right hand threads and the other with left-hand threads. Threaded on each half of this screw are each of which has a pin as shown at 61 that projects through a slot eX- tending lengthwise of the bar 57. The screw 58 has finger piece 62 by which it may be turned so as to simultaneously and uniformly adjust the pins 61 to or from the 7 '57 the fork 50 will center of the machine, said pins being held from turning with the screw as in'my former patent referred to. WVhen the tool holder strikes one of the pins 61 and moves the bar move the spool l? placing one of the springs 18 or 49 under compression and then by reason of the beveled projection 51 on said bar finally release the latch which is holding the lever 39 and therei by permit the shifting of this lever by the worm teeth 65 engaged by spring which has'been placed under compression. a

As is usual in machines of this character, means are provided for feeding the tool into the mortise at the end of each oscillatory movement of the tool carrier. In the present machine this is accomplished as follows. "The guiderail 1 is a worm 66 mounted on an eccentric sleeve 67 havinga finger piece 67, said worm havmg at its lower end a ratchet 69. Secured to the shiftside of this ratchet wheel are reversely acting spring pawls 70 which alternately engage the ratchet wheel at the end of each oscillatory movement of the tool carrier and thereby turn the worm formed with ment with the rack by turning the eccentric sleeve with the finger piece 67 against the holding spring 68 so that the worm can pass freely over the worm rack, after which the carrier may be readily slid along the guides 1 and 2. The spring 68 is designed to hold the worm yieldingly either in or out of engagement with the rack.

The central portion of the cross bar 8 which in'the present instance is placed for ward of the bearing 14 is formed with a curved groove 8 and the rear end of the tool holder is provided with a pin 8 to enter said groove. This construction allows the tool holder and tool a longitudinal movement relative the other parts, this movement being determined by the curvature of the groove 8 of the bar 8 as the pin 8 travels therein during the oscillatory movement, the curvature of this groove being such as to cause the cutting end of the tool to travel in a substantially straight line throughout the entire length of the mortise. By the present construction both frames are greatly shortened and the necessity for providing ball or roller bearings to prevent binding where the shaft crosses the main axis of oscillation is avoided.

From the foregoing it will be observed that, except as to the operation of those details by which the present construction is distinguished from the construction of my former patent the operation generally is the same. That is to say by turning the large main operating wheel in one direction the tool or bit is turned and at the same time automatically swung back and forth to cut an elongated mortise to the depth desired and permitted by the machine.

The forms of the parts can be changed without departing from the gist of the invention claimed.

What I claim is:

1. In a mortising machine, a main frame, an oscillatory tool carried by said frame, a screw having an operative connection with said tool, means for rotating said screw in opposite directions comprising a shiftable clutch, a pivoted shifting lever for said clutch, a pair of springs carried by said lever, a latch for said lever in each of its positions, a slidable bar operated by the oscillations of the tool adapted to compress one or the other of said springs for initially shifting said lever, a beveled member on said shifting lever extending from the side pin on the main frame shifting lever to finally thereof at right angles to the plane of its oscillation,

and a beveled spring-actuated of the machine cooperating with said beveled member on the shift said clutch into operative position.

In a mortising machine, the combination with a main frame, and a sliding frame carrying an oscillated tool, of means for feeding the slidingframe comprising a rack member formed on said frame, a Worm on the sliding frame engaging said rack, a bar sliding with the oscillations of the tool, and means actuated by the sliding bar for intermittently rotating said wor 3. In a mortislng machine, an oscillating support, a tool ivotally connected to said support to oscil ate therewith and thereon,

the connection being such as to permit an axial movement of said tool relative thereto, mechanism for oscillating said tool, the connection between the tool and mechanism being such as to permit pivotal and axial said tool relative thereto, a in advance of the center of oscillation of the tool support and means associated with the tool for engaging said guide, said guide and engaging means adapted to cause the operative end of the tool to oscillate in substantially a straight line.

GEORGE W. CAMPBELL.

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