US775539A - Apparatus for making non-conducting coverings. - Google Patents

Description

No. 775,539. v PATENTED NOV. 22, 1904.

' J. A. MGGONNELL.

APPARATUS FOR MAKING NON-CONDUCTING OOVERINGS.

APPLIOATION FILED FEB. 13, 1902.

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No. 775,539. PATENTED NOV. 22, 1904.

' I J. A. MGGONNELL.

APPARATUS FOR MAKING NON-CONDUCTING GOVERINGS.

APPLICATION FILED FEBv 13, 1902.

N0 MODEL. 4 SHEETS-SHEET 2. I J7 $9 PATENTED NOV. 22, 1904.

J. A. MGGONNELL. APPARATUS FOR MAKING NON-CONDUCTING GOVERINGS.

APPLIGATiON FILED FEB. 13, 1902.

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a v .i i i NTTED STATES PATENT Patented November 22, 1904.

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JOHN A. MCOONNELL, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOR TO MoCONNELL ASBESTOS & COVERING CO., OF PITTSBURG, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

APPARATUS FOR MAKING NON-CONDUCTING COVERING-S.

SPECIFICATION forming part of Letters Patent No. 775,539, dated November 22, 1904.

Application filed February 13, 1902. Serial No. 93,934- (No model.)

To all whom it may concern.-

Be it known that 1, JOHN A. McOoNNELL, a resident of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Apparatus for Making Non-Conducting Coverings; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to apparatus for making non-heat-conducting coverings for steampipes, refrigerator pipes, boilers, and the like, which are constructed of several independent layers of paper, felt, asbestos, hair, or other suitable non-heat-cohducting material.

In the manufacture of tubular non-heat-conducting coverings of this character it has been the custom to wrap the paper, felt, or other fibrous sheets around a mandrel until the desired thickness is built up. It was then removed from the mandrel and cut open longitudinally to permit its being placed upon the pipe or other body upon which it was to be used. In wrapping the layers around the mandrel they were cemented together, and as a consequence the finished tube was very stiff, so that it was difficult to open up the same to place it about the pipe or other body. Hence it has been the custom to cut the tubular covering into halves longitudinally, thus 'making two longitudinal joints which ran directly from the exterior tothe interior of the covering, thereby forming two straight passages for the escape of heat or the admission of cold and also destroying the natural elasticity or recoil, of the material and making the coverings entirely dependent upon external bindings to hold them in place around the pipe. It has been the custom to make such coverings in sections about three feet long, and it will beapparent that stopping and starting the various wrapping operations upon the mandrel and removing the mandrel to take ofi' each section of tubular covering and then cutting the section open is a slow process, so that with the most improved machines heretofore in use it has not been possible for two persons operatingsuch a machine to make more than one thousand feet per day of covering for small-sized pipes and a very much less quantity for larger sizes.

It is the object of my invention to provide apparatus for making tubular coverings of this kind whereby the same is formed at quick intervals from strips of paper or layers of fibrous material and by which the mandrel is removed automatically, so that almost an unlimited quantity of covering can be made in a day, and whereby such covering can be made with a single longitudinal joint which is either overlapping or interlocking, tongued and grooved, U, V, or L shaped or circuitous, so that an out-of-line joint is provided which prevents the escape of heat from the pipe or other body covered thereby.

A further object of my invention is to provide apparatus for making tubular covering having only a single longitudinal joint, so that the natural elasticity or recoil of the materials is retained, which may be further increased by moistening the same during the process of manufacture and then holding them in shape until dry.

A further object of my invention is to provide apparatus for making coverings of this kind wherein the layers are united in such a manner that they can move upon each other, so that the tubular sections will open up easily when placing them about the pipe and without the necessity of cutting them into halves.

A further object of my invention is to provide apparatus especially adapted for making tubular coverings from sheets or strips of paper or similar material provided with transverse corrugations and which, therefore, cannot be bent longitudinally of the sheet.

To these ends my invention consists, generally stated, in providing means whereby strips of paper, felt, asbestos, or other fibrous material are laid one upon the other or whereby a layer or layers of loose non-conducting material such as asbestos fiber, mineral wool, or hairis placed between two or more sheets or strips of paper-orsimilar material, together with means for cutting the assembled strips or layers into sections of the desired width, means for suitably fastening the same together. and means for bending such sections 1 the undermost layer of the pile of strips. A

into tubular form.

More specifically stated, my invention comprises an arrangement of apparatus whereby the assembled strips or layers after being cut into sections of the desired width are fed through stitching or stapling mechanism for securing the same together and thence to an intermittently-acting bending device wherein section, the stitching mechanism being omitted. Fig. 2 is a plan view of the same. Fig. 3 is a side elevation thereof. Fig. 4 is a transverse section through the bending device. Fig. 5 is a horizontal section of the same. Fig. 6 is a plan view of a modified form of bending device. Fig. 7 is a side elevation thereof. Fig. 8 is a transverse section there of. bending-arm. Fig. 10 is a longitudinal section through a modified form of apparatus, and Fig. 11 is a plan view of the same.

The strips of paper or other fibrous material from which the covering is to be made may be supported in any desired way so that said strips can be laid one upon the other;

' but I prefer to wind such strips upon spools or rollers 1, and the latter are supported in the chute or trough 2, which preferably is slightly inclined, as shown, so that the said" strips or sheets can be drawn from the spools or rollers and laid one upon the other, the said strips being guided into position by having the edges thereof contact with the sides of the trough. As many spools or rolls will be used as necessary for the desired thickness of covering, and the strips therefrom will be passed through the feed-rollers 8, placed at the lower end of the trough or chute 2 and in proximity to the table 4. These feed rollers will preferably be positively drivenas,for instance, by the train of gears 5 from the driveshaft 6-and preferably they will be intermittently driven to feed onto the table 4 the necessary length of assembled strips to give the desired width of section required. Any suitable intermittent gearing for this purpose may be employed, such as a mutilated gear in the train 5 or a clutch to be operated by hand. Usually in pipe-coverings the outer strip or sheathing .is made somewhat wider than the others, so

as to form a flap to cover the longitudinal joint. A strip of paper or canvas of greater width than the other strips will therefore be supplied in such manner that it will become Fig. 9 is a view of a modified form of I convenient arrangement for this purpose is shown in Fig. 1, wherein the sheathing-strip is supported upon a spool or roller 7, mounted below the trough 2, the sheet being led therefrom through positively-driven feed-rollers 8,

thence up over the guide-rollers 9 and onto.

the lower strip between said rollers and the guide-rollers 9, and the operator will catch the edge of this lower strip and draw it,beyond the other strips justbefore the saw begins its action, thus securing the projecting flap as described.

WVhen it is desired to form corrugated coverings, one or more of the spools 1 will be provided with corrugated strips, as indicated at 10, Figs. 1 and 4.

In order to give the tubular pipe-covering a set form, so that it will cling to the pipe of its own elasticity, it is desirable to moisten the strips either before or after being bent into tubular form and after being so formed holding the same in shape until dry, as fully described and claimed in my application filed August 4, 1900, Serial No. 25,907. As a convenient means for imparting this moisture to the strips I provide a water-trough 11, having therein a roller 12, under which one of the strips of paper, as from the spool 13, is adapted to pass, the said strip then passing over the guide-roller 14 and being laid together with the other strips, so that the moisture thereof will be gradually imparted to the latter. One or more'of the strips may be moistened. WVhena sufiicient length of the 4 to give the necessary width of section for forming the desired size of covering, the feedrollers 3 are stopped either manually or automatically, and said assembled strips are then cut transversely to form the desired section. Any suitable apparatus, either knife or saw, may be used for this purpose, and such cutting device may either be operated by hand or by mechanism. 1 have shown for the purpose a circular saw 15, which is mounted in the lower end of a swinging frame 16, journaled on the overhead shaft 17 and driven from said shaft by a belt 18. This saw is so arranged that it can swing across the path of movement of the assembled strip and sever the same, and it may be so swung across the strips either by hand or by any suitable mechanism.

assembled strips has been fed upon the table a lug on a sprocket-chain 24. The movement of the latter will swing the saw across the path of the assembled strips and sever the same. A counterweight 25, connected to the frame 16 and passing over suitable guidesheaves 26, automatically returns the saw to its initial position as soon as the slide 21 is disengaged from the chain. When the desired section has been cut off, the strips are ready to be secured together and bent into tubular form. Inasmuch as when working on paper having transverse corrugations the assembled strips cannot conveniently be bent transversely of such corrugations, but must be bent longitudinally therewith, it will be best to have the uniting mechanism and bending mechanism at one side of the table 4 and feed the section sidewise off said table through these mechanisms. This arrangement is shown in the drawings. The cut-off section may be fed to the uniting and bending mechanism either by hand or by mechanical means. I employ for this purpose the sprocket-chains 24, which pass over sprocket-wheels 27 at the outer end of the table 4 and on the drive-shaft 6 and having their upper reaches guided in grooves or slots in the table 4. Preferably two sprocketchains will be employed, as shown, and they will preferably be driven continuously at a slow speed. Secured to these sprocket-chains at suitable intervals are projections 28, which will engage the cut oif section and feed it transversely, these projections preferably being rounded, as shown, so as not to mutilate the paper, and projecting forwardly of their point of attachment to the chains, as shown at 29, so as to feed the section a considerable distance beyond the outer ends of the chains and fully onto the bending device.

In the path of movement of the sections when being fed sidewise by the chains 24 are suitable guides or gages 30, arranged to contact with the edges of the sheets and being so shaped as to give the necessary relative positions of the sheets to form the desired jointas, for instance, if it is desired to form an interlocking tongue-and-groove joint, one of these gages will be provided with a groove and the other with a tongue, so as to displace the sheets relatively to each other to form a groove on one edge and a tongue on theother, and as the sheets are not secured together at this stage this is easily accomplished. In their further forward travel the sections are secured together by suitable mechanism, such as stitching or stapling mechanism, and I have shown for this purpose a diagrammatic representation of a wire-stapling mechanism 32, which is or may be of any suitable type, this mechanism being preferably arranged so as to unite the strips or sheets along the longitudinal center of the section. By means of the chains and guides described the section will be delivered to the bending mechanism with the sheets or layers thereof secured together. I

The bending mechanism comprises a table 33, composed of two side frames 34, which are inclined at their upper ends, as at 35, and farther down become substantially vertical, as at 36, and form the sides of a narrow chamber or slot 37. At its lower end this chamber or slot is somewhat widened at one or both sides, as shown at 38, by having the side bars 39 either cut away or bent outwardly, and the bottom for said chamber is formed by a plate -or shelf 40, which is so mounted that it can be readily removed. Said shelf is preferably slidably mounted in grooves in the standards 41 and is connected by a link to one arm of the treadle 42, whereby the plate can be drawn out when desired. The counterweight on the arm 43 of the treadle will return the shelf to position. The side frames 34 are so united that the width of the slot 37 can be varied to accommodate sections of various diameter.

This is secured by having the cross-bars 44 provided with a series of holes 45, through which bolts or pins are passed and into the standards 41 on the opposite half of the frame. Above the chamber or slot 37 is the mandrel 47 which, as shown, is preferably semicylindrical in shape and hinged to the plungers 48. The mandrel preferably has one edge thereof weighted, as by having lead or other metal embedded therein, so that it will naturally take the position shown in full lines in Fig. 4 but when depressed will assume a horizontal position, as shown in dotted lines in Fig. 4. The plunger-s 48 are movedupwardly and downwardly by any suitable mechanismas, for instance, by having formed thereon the racks 49, which are engaged by gears 50 on asuitable overhead shaft 51, so that when this shaft is rotated the plungers 48 will be depressed, thereby carrying the mandrel 47 downwardly on top of the section of strips supported ,above the slot or groove 37 and will force the same down into said slot or groove, thereby causing the same to bend into an approximately tubular form, as shown in Fig. 1.

Any suitable mechanism may be used for rotating the shaft 51such, for instance, as the treadle 53, cord 54, passing over the drum 55 on the shaft 51, and the counterweighted cord 56, wound on the drum 57, as shown in Fig. 3. I prefer, however, to operate the mandrel 47 in unison with the saw 15, and therefore 1 provide the drum 57, on which is wound the counterweighted cord 56, which will automatically return the mandrel 47 to its elevated position. On the other drum, 55, is wound a cord 59, which is connected to a slide 60, suitably mounted in the frame or other support in proximity to the frame 16 of the saw. On this slide is a spring hook or latch 61, which is adapted to engage a lug 62 on the saw-frame, so that when said saw is drawn across the path of the assembled sheets to sever the same the lug 62 will engage the latch 61 and pull the same along with it, thus rotating the shaft 51 and depressing the mandrel 47. As soon as the mandrel, however, has pressed the assembled sheets down upon the shelf 40 it must be withdrawn, and consequently a stop or other tripping device 63 is placed in the path of movement of the latch 61 and will disengage said latch from the projection 62 and allow the counterweight 56 to return the mandrel to its elevated position.

The bent-up sheets after the mandrel 47 is Withdrawn will remain in proper position and will then be secured by bands or ties. The sides of the chamber or slot 37 are merely bars 39, thereby leaving space through which the ties or bands can be placed around the tube. Preferably these ties or bands will be placed upon the shelf 40 before the section is bent into shape, and are shown at 65 As soon, therefore, as the mandrel is withdrawn the ends of these bands will be secured, and then the treadle 12 will be operated to withdraw the shelf 10, allowing the section to fall down upon the inclined way or skids 66, whence it will roll away. The sections when pressed down to the bottom of the slot or chamber 37 will come into the widened portion 38 and will remain in tubular form, so as to permit the Withdrawal of the mandrel. The sides of the slot are preferably cut away more on one side than on the other, and this will permit the tube to expand more on one side than on the other, so that one of the edges will lie somewhat lower than the other, and when the bands are applied the upper one will naturally overlap the lower one.

In Figs. 6, 7, and 8 I have shown a modified form of bending apparatus, the same comprising a table 70, adapted to support the cutoff section and provided with suitable guides or gages 71 for engaging the edges of the sheets, one of said guides being preferably provided with a groove 72 for receiving the projecting edge of the wider sheathing-strip. Mounted in this table are two rock-shafts 73, each carrying a series of bending-arms 74:, which normally lie in approximately a hori- Zontal position, as shown in dotted lines, Fig. 8, and which are adapted to be swung upwardly and toward each other, so as to engage the edges of the sheet and bend the same into tubular form around the mandrel 17. For this purpose the rock-shafts 73 are provided with the arms 75, which are connected, by means of cords 76, passing over suitable guidepulleys 77, to the counterweighted treadle 78. Upon releasing the treadle 78 the counterweight? 9 will permit the arms to return to their normal positions. These arms are slightly curved, as shown, so as to bend the sheets into proper form. In lieu thereof the su bstantially hook-shaped arms 80 (shown in Fig. 9) may be employed; but with the latter the mandrel 17 will not be used, as it could not be withdrawn from the tube because the projecting ends of the hooks 80 would arrest the same.

WVhen' I desire to form non-conducting coverings partly of paper strips and partly of loose fibrous material such as hair, mineral wool, asbestos, and the like-l substitute for the spool-supporting chute 2 suitable apparatus for spreading a layer of the fibrous material and applying covering-strips thereto. Such apparatus is shown in Figs. 10 and 11. The loose fibrous material is put into the hopper of a rotary picker 82, which is positively driven from any suitable source, as by the belt-pulleys 83, and which will deliver such fibrous material in a thin even layer through the spout 8 1 upon an apron, belt, or chains 85, running over the table86. This apron or belt passes over rollers 87 at each end of the table, which are driven from any suitable source. To compact or felt the fibrous material on the apron or belt, I provide a series of hammers 88, mounted on rock-shafts 89, extending transversely over the table and having connected thereto the arms 90, which are actuated from any suitable source-as, for instance, the eccentrics 91 on the picker-shaft, which eccentrics are connected by suitable connecting-rods 93 to the arms 90. Alternate ones of these rock-shafts are preferably connected to separate eccentrics, as shown,wherein an eccentric is provided on each end of the picker-shaft. These eccentrics are reversibly placed, so that when one half of the hammers are raised the other half will be depressed. These hammers alternately rise and fall and stamp or press the fibrous material down upon the belt or apron 84 upon the table to compact the same.

At the end of the table 86 is another table 94:, at the forward end of which are the guiderollers 95. The strips of paper, canvas, or other enveloping material are carried on spools or rollers 96, suitably supported one above and the other below the'table 9 1. From these spools the layers of enveloping material are led over the guide-rollers 95, one on top of and the other below the layer of fibrous material being fed forward by the apron or belt 84, and the combined layers of fibrous material and enveloping strips are then led to suitable stitching mechanism 97, which will unite the enveloping strips at their edges, so as to inclose the fibrous filling and preferably also unite the same along the center. From this stitching mechanism the filled covering passes through a pair of plain-faced feed-rollers 99, which press or compact the same. These rollers are adjustable by means of the screws 100, and they serve to feed the filled covering onto the table 101, where a section of the desired length is cut ofl, as by means of the saw 15. Thence the severed section will pass to the bending mechanism 33, which in this case, however, is preferably in line with the other parts of the apparatus instead of at one side thereof.

The apparatus disclosed in Figs. 10 and 11 for supplying the loose fibrous material and the specific form of bending mechanism shown in Figs. 6, 7, and 8 are not claimed in this application, but are claimed in my application filed February 23, 1904, Serial No. 194L808, which is a division of this application.

The apparatus shown and described is simple, and most parts of it can be operated by hand or at least with a limited amount of power. At the same time the covering can be made so rapidly as to very greatly increase the output and is much cheaper than with the old method of winding on a mandrel. Furthermore, the covering formed is provided with only a single longitudinal joint and when moistened as described and allowed to dry will have a natural elasticity which will hold it on the pipe independently of other fastening means. the same time the several layers or sheets are disconnected except for a line along their centers, so that they will move over each other readily to permit the covering being placed upon the pipe.

What I claim as my invention, and desire to secure by Letters Patent, is-

I. In apparatus for forming articles of paper or other fibrous material, the combination with means for laying three or more strips or layers of fibrous material one upon the other, of stitching or stapling mechanism for uniting said layers, mechanism for cutting the same into sections while in a fiat condition, and mechanism for feeding the united layers to the cutting mechanism.

2. In apparatusfor forming articles of paper or other fibrous material, the combination with means for laying three or more strips or layers of the fibrous material one upon the other, of stitching or stapling mechanism for uniting said layers, a saw arranged to pass across the path of said layers for cutting the same into sections While in a Hat condition, and intermittently-actuated feeding means for feeding the assembled layers to the saw.

3. In apparatus for forming tubular articles of paper orother fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, of mechanism for cutting the same into sections, intermittently-acting feeding means for feeding the same to the cutting mechanism, and means for bending the cut-off section into tubular form.

4:. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, of means for cutting the same into sections, and means for bending the cut-off section into tubular form.

5. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, of means for cutting the same into sections, means for uniting the layers of said cut-ofi sections, and means for bending the same into tubular form.

6. In. apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, of means for cutting said layers into sections, stitching or stapling mechanism for uniting the layers of said cut-off sections, and mechanism for bending the same into tubular form.

7. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous materlal one upon the other, means for cutting the same transversely into sections, means for stitching or stapling the layers along the longitudinal centers of said sections, and means for bending the same into tubular form.

8. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, means for cutting the same into sections, intermittently-acting feeding means for feeding the same to the cutting mechanism, and intermittently-acting mechanism for bending the same into tubular form.

9. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, means for cutting the same into sections, means for bending the same into tubular form, and a traveling chain having lugs thereon to engage the sections and feed the same to the bending device.

10. In apparatus for forming tubular articles of paper or other fibrous material, the

combination with means for laying strips or layersof the fibrous material one upon the other, means for cutting the same into sections, stitching or stapling mechanism for uniting the same, and traveling chains having lugs for engaging the section and feeding the same past the stitching mechanism.

11. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, of means for cutting the same into sections, stitching or stapling mechanism for uniting the same, means for feeding the cutoff section to the stitching mechanism, and guides or gages for engaging the edges of the layers in their course to the stitching mechanism and shaping the same.

12. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the tubular form, and traveling sprocket-chains having lugs thereon provided with forwardlypro ecting parts for engaging the cut-ofi sec-' tions and feeding the same to the bending devices.

13. In apparatus for forming tubular articles of paper or other fibrous material, a bending device comprising a frame provided with a slot or chamber over which the layers to be bent are placed, and with slots or openings intersecting said chamber transversely, a plunger-mandrel arranged to force the layers down into said slots and bend them into tubular form, and mechanism for depressing and raising said mandrel.

14. In apparatus for forming tubular articles of paper or other fibrous material, abending device comprising a slot or chamber having walls bulged outwardly near the bottom of the slot and over which slot the layers to be bent are placed, and a plunger-mandrel adapted to force the layers down into said slot and bend them into tubular form.

15. In apparatus for forming tubular articles of paper or other fibrous material, bend.- ing devices comprising a slot or chamber over which the layers of material are to be placed, the side walls of said slot having openings at intervals to permit the application of bands, and a plunger-mandrel arranged to force the layers down into said slot to bend the same into tubular form.

16. In apparatus for forming tubular articles of paper or other fibrous material, the combination with a frame having a chamber or slot over which the layers to be bent are placed, a removable bottom for said chamber or slot, and a plunger-mandrel arranged to force the layers down into said slot and bend the same into tubular form.

17. In apparatus for forming tubular articles of paper or other fibrous material, the combination with the frame provided with a chamber or slot over which the layers are placed, and with slots or openings intersecting said chamber transversely, plungers or the like mounted over said slot, a longitudinal mandrel carried on the lower ends of said plungers and adapted to force the layers down into said slot and bend the same into tubular form, and mechanism for depressing and raising said plungers.

18. In apparatus for forming tubular articles of paper or other fibrous material, the combination with a frame provided with a chamber or slot over which the layers are placed, plungers or the like mounted over said slot, and a longitudinally-arranged mandrel hinged to the lower ends of said plungers and adapted to force the layers down into said slot and bend the same into tubular form.

19. In apparatus for forming tubular articles of paper or other fibrous material, the

combination with a' frame provided with a chamber or slot and having openings or slots intersecting said chamber transversely, of a plunger-mandrel mounted over said slot and adapted to press the layers down into the same, means for depressing said mandrel, and means for automatically withdrawing the same.

20. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, a saw for cutting the same into'sections, amovable frame in which said saw is mounted, a bending device, chains for feeding the cut off section to the bending device, and connections between said chain and the movable sawframe for moving the latter across the path of the layers.

21. In apparatus for forming tubular articles of paper. or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, a saw for cutting the same into sections, a movable frame in which said saw is mounted, a bending device, chains for feeding the cutoff section to .the bending device, a lug on said chain, a slide arranged to be engaged by said lug and moved therewith, and connections between said slide and the movable saw-frame for moving the latter.

22. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, a saw for cutting the same into sections, a movable frame in which said saw is mounted, a bending device comprising a frame having a slot or chamber, a plunger-mand rel for forcing the cutoff section down into said slot or chamber, thereby bending the same into tubular form, and connections between said sawframe and plunger for actuating the latter.

23. In apparatus for forming tubular articles of paper or other fibrous material, the combination with means for laying strips or layers of the fibrous material one upon the other, of a saw for dividing the same into sections, a movable frame in which said saw is mounted, a bending device com prising a frame having a slot or chamber, a plunger-mandrel for forcing said sections into said slot or chamber to bend the same into tubular form, means for depressing and elevating said plunger, a latch or hook connected to said means,

said latch or hook lying in the path of a lug on the movable saw-frame and adapted to be engaged thereby, and a stop or abutment for disengaging said latch from said lug.

In testimony whereof I, the said JOHN A. MoCoNNELL, have hereunto set my hand.

' JOHN A. MOOONNELL. Witnesses:

/ ROBERT C. TOTTEN,

F. W. WINTER.

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