US1863605A

US1863605A - Portable mortise and tenon machine

Info

Publication number: US1863605A
Application number: US596682A
Authority: US
Inventors: Albert E Mitchell
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-03-04
Filing date: 1932-03-04
Publication date: 1932-06-21
Anticipated expiration: 1949-06-21

Description

June 21, 1932. A. E. MITCHELL PORTABLE MORTISE AND TENON MACHINE Filed March 4, 1932 4 Sheets-Sheet 1 [N VENTOR .4 TTORNEY June 1932- A. E. MITCHELL 1,863,605

PORTABLE MORTISE AND TENON MACHiNE Filed March 4, 1932 4 Sheets-Sheet 2 [N VENTOR.

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ATTORNEY June 21, 1932. E, MlTcHELL 1,863,605

PORTABLE MORTISE AND TENON MACHINE Filed March 4. 1932 4 Sheets-Sheet 3 1N VENTOR M m imzzze ATTORAEV June 21, 1932. E, MW HE LL 1,863,605

PORTABLE MORTISE AND TENON MACHINE Filed March 4, 1952 4 Sheets-Sheet 4 11v VENTOR ATTORNEY Patented June 21 1932 UNITED. STATES ALBERT MITCJEIELL,

STAMFORD QQNNECTIGUT PORTABLE MQBTISE AND TENON MACHINE Application filed March 4,

This invention relates to portable machines for reforming damaged mortise or tenon ends on underground conduit sections.

Underground conduits are made up of square wooden sections ranging in length from three to ten feet or over and are provided with a central bore extending the entire length of the said sections, and each section is provided with-a tenon and mortise and concentric with the said central bore,

the tenon end of one section fitting into the mortise end of the next'section'in a given conduit.

In shipping the conduit sections or in the 1.5 handling of same in the field, the tenon end which is comparatively frail becomes damaged. At times the mortise end also becomes damaged. Up to'the present time the damaged tenon has been reformed by acarpenter with a saw and chisel and the mortise end, by anymeans found practical.

The reforming of the said ends by the means referred to is costly and takes up a great deal of time. In'order to obviate the disadvantages of the present method of reforming the said ends, I have perfected my invention.

One object of the invention is to provide a portable hand machine with which the damaged mortise and tenon ends of conduit sections may accurately and rapidly be reformed in the field. V

Another object of the invention is to provide a machine of this character havinga holding vise which will accomodate various sizes of conduit sections and to have sufiicient side movement to be'able to perfectly aline the work with the vertical center line of the machine.

A further object of the invention is to provide a tool carrying disc adapted to be rotated and fed inwardly of the work either due to the said rotation or independently thereof. I V

Another object is to produce a device of the character described in which the maximum simplicity of construction and operation is secured. e

Other objects and advantageswill appear as the nature of the improvements i better 1932. Serial No. 596,682.

understood, the invention consisting sub.- stantially in the novel arrangement and co? relation of parts herein fully described, and illustrated in the accompanying drawings, wherein similar reference characters are used to describe corresponding parts throughout the several views, and then finally pointed out and specifically defined and indicated in the,

appended claims. e

The disclosure made the basis of exemplifying the present inventive concept suggests a practical embodiment thereof, but

the invention is not to be restricted to the exact details of this disclosure, and the latter, therefore, is to be understood from an illus: trative, rather ,than arestrictive standpoint.

The inventive idea involved is capable of receiving a variety of mechanical expressions, one of which, for the purpose of illus-..

tration, is shown in the accompanying drawings, in which- Figure 1 is an end view in elevation of the work receiving end of one form of the machine. Y

Figure 2 is a side view thereoflooking from the right of Figure 1. r

Figure 8 is a sectional view taken on line 33 Figure l. 1 i V Figure 4 is a fragmental view in elevatinn of the end oppositethat shown in Figure 1 of a modifiedform of the invention. Figure 5 is a top .plan view thereof. Figure 6 is a side view thereof, looking from the left of Figure 4. K

Figure 7 is a perspectiveview of. the grooving tool.

Figure 8 is a front View of the tool carry-- ing disc, and

Figure 9 1s a perspective view partly broken away, of a conduit section.

Referring now to the drawings in detail 7 and ore particularly to Figures 1, .2, 3," Z, 8 and of the said drawings 20 indicat base board or'support, to whichis' by means of bo1tsf21 a bracket 2 2 h bosses or bearings '23 throughwhieh' pass bolts 24 upon each of which there'ispivotally mounted apairof links25; Inferiiie diate the ends of each pair of the said links 25, as at 26 tliere is pivotally mounted a vise each other when the screw 36 is turned by jaw 27 having two sides at right angles to each other adapted to receive a conduit section 28 which is to be reformed.

The links at the right side of the machine looking at Figure 1 are .pivotally connected at their upper ends by means .of screw threaded plugs 30, and .nuts 31, the said plugs extending from each side of a block 32 provided with a centrally located opening 33 having an internal left hand thread therein. The links 25 at the left hand side of the machine are similarly connected to a block 34 having an opening 35 provided with an internal right hand thread-. A screw 36 having a right hand threaded portion 37 passing through the opening 35 in the block 34 and a left hand threaded portion 38 passing through the opening 33 in the block 32 tends to rock'tlie links 25 towards and away from means of rods 40 extending from a block 41' centrally located on the screw 36. In-

clined faces 43 on the vise sections provide conduit sections.

355 will now describe.

means for holding same open to receive the Due to-the right and left hand threaded portions 37 and 38 of the screw 36 the links can be operated to accommodate various sizes of-conduit sections28, (seeFig. l) and due to the pivotal mounting of the links 25 upon which the said vice jaws or sections are mounted the vertical center line of the said conduit sections can be brought into alinement with the rest of the machine which I Secured to the base 20 is a bearing bracket 45 provided with a central bore46 whose horizontal center line coincides with the horizontal center line of the vice jaws 27. Mounted within the said bore 46 is a bushing 47 in which there is rotatably mounted a hollow sleeve 48 which has secured thereto at the end opposite the bracket 45 a shouldered cap or pulley 49 by means of screws 50. The

'sleeve 48 is provided intermediate its ends with a threaded portion 51 upon which is screw-threadedly maintained a disc 52 provided with sets of holes v53-54 and 55 to hold tools 56 for reforming the tenon end 57 of four inch, three and one-half inchand three inch conduit sections respectively. The said disc 52 is likewise provided with sets of openings 58, 59 and 60 to receive the said tools for reforming the mortise end 61 of such conduit sections.

The disc 52 carrying the tools 56 is rotated by means of a handle 62 secured to one end of a shaft 63 the opposite end of which is secured to ,the cap 49. The said cap 49 at its largest portion 64 is of sufficient diameter to enter the'internal bore 65 of a three inch conduit section so as to centralize same with the remainder of the machine. 7 In order to perform this function withrespect to conduits 72. A key 73 provides-additionalsecuring means between the said parts. A hand wheel 74 is secured to the bushing 72 by means of a key 75 so that the hollow shaft may be rotated by the rotation of the hand wheel 74. A spacing cap is screw threadedly maintained on the bushing 47, between the bracket 45 and the hand wheel 74.

Located within the hollow shaft 48' is'a long nut 76 provided with an internal worm thread 77 with which there engages the exteriorly worm threaded portion 78. on the hollow shaft 70. The nut 76 has a reduced screw threaded portion 79 .which screws into an auxiliary nut 80 fast to the sleeve 48 and in engagement with an enlarged shoulder 81 on the main shaft 63, the said portion 81 being held by the nut 80 against the worm nut 76. To prevent the worm nut from rotating I slidingly secure same to a bushing 83 by means of a screw 82 extending into a keyway 82a in the said bushing 83 which is provided with a slot 84 through which passesa screw suring a perfect alinement of the conduit sec tion with the said cutting tools.

A frame 88 is screw-threadedly maintained on the bushing 47 and has secured thereto one; end of spacer rods 89, the opposite reduced ends 90 of which are driven into openings in a fiat ring 91 which is adapted to abut and act as a backing for all sizes of conduit sections and still permit the tools to pass therethrough. V 7 v Fromthe foregoing it will be seen that the rotation of the shaft 63 produces a rotary movement of the cutting tool disc and the IQ-.' tation of the feed wheel produces a feed movement ofthe said disc and tools, so that the said feeding movement is entirely independent of the rotary movement of the tools.

In Figures 4, 5 and 6 Ihave shown a modified form of my invention wherein I provide means by which the feeding of the tools may be accomplished simultaneously with their rotation. To accomplish this the main shaft 63 is provided, with a keyway 95 and has a worm gear 96 keyed thereto and fastened against lateral movement by a set screw 97.

bearings 100 and has secured thereto the operating handle 62. Adjacent the worm gear 96 there is keyed to the shaft 63 an eccentric 101 which is spanned by a forked lever 102 which is secured by screw bolts 103 to a flat strip 104 slidably mounted in a bracket .105

secured to the bearing bracket 45. Pivotally mounted on the said strip 104 as at 106 is a pawl 107 which is in engagement with a toothed ratchet wheel 108 which is mounted on the bushing 71 in exactly the same mannor as the hand wheel 74 and which it replaces in this form of my invention.

Normally the pawl 107 is held in engagement with the ratchet 108 by means of a spring 109 suspended from an ear 110 on the said pawl and anchored to a stud 111 secured to the lower part of the pawl supporting strip 104. However, the said pawl 10'? may be brought out of engagement with the ratchet by swinging same into the dot and dash position Figure 4 and kept in said position by inserting a rod through an opening 112 in the upper portion of the pawl 107 and through an opening 113 in the upper portion of the flat strip 104. (See Figure 4.)

In the normal arrangement of parts the shaft 99 is rotated by the handle 62 thus imparting rotary movement to the shaft 62 and eccentric 101 through the worm and

worm wheel

98 and 96. It will therefore be seen that upon a complete rotation of the shaft 62 the ratchet wheel 108 will have been rotated through an angle equal to the distance between two ratchet teeth and imparting a predetermined amount of feeding movement of the tool carrying disc. However by disengaging the pawl from the ratchet wheel, the said wheel may be rotated by hand through an angle greater or less than the distance between two ratchet teeth.

From the foregoing it will be seen that with the modified form of my invention I may feed the tools simultaneously with the rotating movement or independently therefrom.

It will be understood that the damaged tenon or mortise end is first cut off and the conduit section is then clamped in the vise jaws, after which the machine is operated to cut a groove G (see Figure 9) in the remaining portion of the conduit section to the required depth after which the remaining corners are cut off by any means available.

It will therefore be seen that I have provided a simple yet efficient portable machine for accurately reforming in the field the tenon or mortise ends of conduit sections.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a machine for reforming either end of a conduit section provided with a mortise end and a tenon end and a bore concentric with the said ends, a rotatably and slidably to'the said shaft, means on the said shaft for engaging the conduit bore, a tool. carrying holder secured to the said sleeve, meansv for rotat ng "t e said tool holder, means for moving the said tool holder towards and away from the said conduit section, and a vise fo clamping the said section concentrically with the orbit of the tool. Y

2. In a machine for reforming either end of a conduit section provided with a mortise end and a tenon end and a bore concentricxwith the said ends, a. rotatably and slidably mounted main shaft, a hollow sleeve secured to the said shaft, means on the said shaft for engaging theconduit bore, a tool carrying holder secured to the said sleeve, an internally worm threaded nut operatively maintained within the said "sleeve, a hollow shaft on the main shaft, an external worm'thread on the said hollow shaft inengagement with the thread in the nut, means for holding the nut against rotation, means for rotating the hollow shaftwithin the nut, means for rotatably connecting the main shaft to the nut, and means for rotating the main shaft. 6

v 3. In a machine for reforming either end of a conduit section provided with .a mortise end and a tenon end and a bore concentric with the said ends, .a rotatably and slidably mounted main shaft, means on the said shaft for engaging the conduit bore, a hollow sleeve secured to the said shaft, .a tool carrying holder secured to the said sleeve, an internally worm. threaded nut operatively maintained within the said sleeve, a hollow shaft on the main shaft, an external worm thread on the said hollow shaft in engagement with the thread in the nut, means for holding the nut against rotation, means for rotating the hollow shaft within the. nut, means for connectin g the main shaft to the nut, means for rotating the main shaft, and an abutment against which the end of the conduit section being reformed is held.

4. In a machine for reforming either end of a conduit section provided with a mortise end and a tenon end and a bore concentric with the said ends, a rotatably and slidably mounted main shaft, a hollow sleeve secured to the said shaft, means on the said shaft for engaging the conduit bore, a tool carrying holder secured to the said sleeve, an internally worm threaded nut operatively maintained within the said sleeve, a hollow shaft'on the main shaft, an external worm thread on the said hollow shaft in en agement with the thread in the nut, means or holding the nut against rotation, a drive shaft, a worm thereon, a worm gear on the main shaft in mesh with the worm, means for connecting the main shaft to the nut an eccentric keyed to the main shaft, a slidable post, an arm secured to the post and in operative engagement with the eccentric, a toothed ratchet wheel secured to the hollow shaft, and a spring pressed pawl pivoted on the slidable post and normally in engagement, with the ratchet wheel to rotate the hollow shaft in the nut to feed the said 4, nut and tool carrying sleeve towards the conduit section end to be reformed.

5. In a machine for reforming either end of a conduit section provided with a mortise end and a tenon end and a bore concentric with the said ends, a rotatably and slidably mounted main shaft, a hollow sleeve secured to the said shaft, means on the said shaft for engaging the conduit bore, a tool carrying holder secured to the said sleeve, an internally worm threaded nut operatively maintained within the said sleeve, a hollow shaft on the main shaft, an external worm thread on the said hollow shaftin engagement with the thread in the nut, means for holding the nut M against rotation, a drive shaft, a vworm thereon, a worm gear on the main shaft in mesh with the worm, means for connecting the main shaft to the nut an eccentric keyed to the main shaft, a slidable post, an arm se- A cured to the post and in operative engagement with the eccentric, a toothed ratchet wheel secured to the hollow shaft, a spring pressed pawl pivoted on the slidable post and normally in engagement with the ratchet wheel .7, to rotate the hollow shaft in the nut to feed the said nut and tool carrying sleeve towards the conduit section end to be re-' formed, and means whereby the pawl may be held out of engagement with the ratchet.

In testimony whereof I hereunto afiix my signature.

ALBERT E. MITCHELL.