US685162A - Broom-sewing machine. - Google Patents

Description

A. MILLER.

BRDOM SEWING.,-,MACH|N'E.

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(Application filed Feb. 7, 1900.)

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N0. 685,|62. Paten'cd Oct. 22, |901. A. E. MILLER.

1" BRGOM SEWING MACHINE.

(Application tiled Feb. 7. 1900.) (No Model.) 7 Sheets*$heet 2.

(Application man Feb. 7, 1900.)

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No. 685,|62. Patented Oct. 22, 190|.

A. E. MILLER. BROM SEWING MACHINE.`

(Application filed Feb. 7, 1900.)

(No Model.) 7 Sheeis-Sheet 4.

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N0. 685,52. Patented Oct. 22, |90I.

A. E. MILLER.

BROOM SEWING MACHINE.

(Application filed Feb. '7, 1900.) '(.No Model.)

7 Sheets-Sheet 5.

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No. 685,162. Patented oct. 22,f|9,o|.

A. E. MILLER. Y snoom sl-:wlrml MACHINE.

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No. 685,I62. Patented Oct. 227 I90I. A. E. MILLER.

BROOM SEWING MACHINE.

(Application med Feb. 7, 1900.)

(No Model.) 7 Sheets-Sheet 7` @num/M u UNITED STATES PATENT OFFICE.

ANDREw E. MILLER, oF BALTIMORE,

MARYLAND, AssIeNoRjro HERBERT CASSARD, OF CHICAGO, ILLINOIS. I

YBRooM-"stwine MACHINE.

SPECIFICATION forming part of Letters Patent No. 685,162, dated October 22, 1901.

Application filed February 7, 1900. Serial No, 4,369. (No model.)

Toa/ZZ wholly, it may concern:

Be it known that I, ANDREW E. MILLER, a subject of the Queen of Great Britain, residing at the city of Baltimore, in the State of Maryland, haveinvented certain new and useful. Improvements in Broom-Sewing Machines, of which the following is a specification.

The objects of this invention are to improve broom-sewing machines, and particularly the machine'for which United States Letters Patent were granted to me on January 31, 1899, No. 618,798.`

The present improvements relate to devices for supporting the'binder during the operation of sewing the broom, to the feeding mechanism for advancing the broom during the sewing operation, to devices for automatically lowering the broom after each row of stitches to adjust it for the succeeding row of stitches, to means for staggering the stitches in adjacent rows, and to other improvements in details, all of which will be described in the following specification.

In my copending application, Serial No. 4,370, filed February 7, 1900, I have embodied certain features which are illustrated in this case, but not claimed herein.

In the accompanying drawings, Figure 1 v is a front view of the machine. Fig. 2 is a side view. Fig. 3 is a side view of the vise and connected mechanism upon an enlarged scale. Fig. 4 is a front View ofthe vise-frame and vise, partly in section, on the line a a of Fig. 3. Fig. 5 is a side view of the vise, partly in section, on the line b b of Fig. 4. Fig. 6 is a plan view of the vise-feeding devices. Figs.v 7 to 12, inclusive, illustrate details.

The general construction and operation of the broom-sewing machine illustrated in the drawings are described in the patent above mentioned and it will only be necessary in this speciiication to describe the improvements. constituting the present invention. The principal parts of the machine comprise the main frame A,the swinging vise-frame B, carrying the vise and the vising mechanism, rocking arms C, whichl reciprocate the needlesE upon guides F, a driving-wheel G, and a clutchHior engaging the driving-wheel' with the power-shaft I. The arms C are driven Ition of Fig. 6.

by a crank-pin on a disk J, mounted on the shaft I. y

The oise-feeding mec7zam'sm.-The visejaws K are hinged to the vise-frame B and adapted to be closed, as in the prior patent mentioned, by means ot' a treadle L. The vise-frame is mounted on trnnnions M and is lprovided with a counterweight N. A suitable spring l tends to throw the vise forward 6o' into the position shown in Fig. 2. To the npper part of the vise-frame is attached a rack 2, having long teeth, which are preferably radial to the axis upon which the vise-frame rocks. The rack 2 is connected to the inner 65 vise-jaws 3 and moves vertically with said jaws. The connection between the jaws and the rack may be made in any suitable manner. As shown in Figs. 3 and 4, the rack is connectx ed to a sliding piece 4 on the outside of the 7o vise-frame,which slide is connected to an arm 5, projectingfrom the collar 6. The collar 6 is connected with the inner vise-jaws by links 7. The rack 2 is adjustably connected to slide 4 by means of vbolts 4a, which pass through 75 slots 2a in said rack. As shown in Figs. 2, 3,

land '6, two pawls 8 and 9 coperate with the rack 2. The pawl 8 is a moving pawl, being onvone arm of a lever 10, which has a pin- 14. The pawl-lever 10 is normally held in 85 the position shown in Fig. 6 by means of a spring 15. Below the pawl-lever 10 is a lever 16, carrying the holding-pawl 9. The lever '16 bears on a cam-disk similar to disk 12'and provided with cam projections 17, which are 9o diainetrically opposite and midway between the projections 13. The cam projections 13 and 17 may of course be upon one disk, the projections 13 being in a higher planev than the projections 17. The lever 16 is provided 95 with a spring 18 to hold it normally in engagement with the rack, andaiso with a handle 19, by means of which the rack may be released when desired. The operation of the pawls 8 and 9 will be evident from an inspecroo When the cam-lever 16 is thrown out of engagement with the rack by means of the cam projections 17, the rack is thrown forward by the spring 1, connected with the vise-frame. The pawl 8 is carried with the rack, the pin-and-slot connection 1l permitting it to move sufficient to carry the rack forward one tooth. T he pawl 9 immediately rengages the rack and holds it, and when the shaft 14 makes a quarter-turn the pawl 8 is thrown out of engagement with the rack and immediately drawn back to engage a new tooth by means of the spring 15.

It is necessary in producing perfect work that the stitches in adjacent rows should be staggered, and I have provided devices for locating the stitches of each row half-way between the stitches of the adjacent rows. As shown in Figs. 2 and 3, a shield 2O is adjustably connected to the rack 2 by means of bolts 21, which pass through two series of holes 22 in the shield-plate. The shield has a radial edge 23, which can be made to cover one or more of the teeth at the front edge of the rack to prevent the pawls engaging with said teeth. In the edge 23 are recesses 24, which uncover one additional tooth. It thus follows that when the pawls are opposite the recesses the stitching begins one tooth or step nearer the edge of the broom than when the pawls encounter the radial edge 23. As the pawls permit two teeth to escape for each complete stitch, it follows that the stitches in one line will alternate with those in the adjacent line, thus carrying the staggering uniformly across the broom. On the rear edge of the feed-rack are filling-pieces 25, which may be formed integral with the rack-frame,as shown, or made separate and removably secured thereto, like the guard-plate, and which prevent the pawls from engaging the last tooth 26 on alternate lines of stitching. The guardplate is adjustable to sew seams of different lengths on brooms of different sizes. As the rack-teeth are radial or divergent and the rack is movable radially or transversely with respect to the pawls, it follows that the release of one tooth will permit the vise to move through a shorter arc when the rack is raised than when it is lowered. Hence the stitches in successive rows will increase in length as successive rows will correspondingly inthe rack is dropped, and the lengths of the crease, assuming the same number of teeth to be released by the pawls in the several positions of the rack. If the teeth were parallel, the stitches would be the same length in different rows, and it would be necessary to permit the pawls to engage a greater number of teeth in the successive positions of the rack in order to increase the length of successive rows of stitches.

Automatic start/ng mcchtmfism.-A spring 27, Fig. 2, which is connected to the clutchlever 28, constantly tends to throw the clutch H into engagement with the drive-wheel G. When the machine is stopped, the clutch is held out of engagement by arm 29, which engages a shoulder 30 on abar or frame 31, conees,

`of the rack, Fig. 9.

nected with the clutch-lever. The arm 29 is.'

mounted on a shaft 32, upon which is a second arm 33, having a pin 34 in the path of a lever 35, pivoted to a bracket of the main frame at 36. The upper end of the lever 35 has an arm 37, Fig. 2, adapted to be engaged by the adjustable guard-plate 20 when the vise is thrown back into the position tobegin arowofstitches. Thearm 37 engages the radial edge 23 or one of the recesses 24, depending upon the heightto which the rack and the inner vise-frame are adjusted. It therefore follows that the automatic starting of the machine is eected at the proper time to begin any seam on either a large or small broom, respectively, the starting being effected by the same part which regulates the number of stitchesthat is, the adjustable guard 20. The startinglever 35 is held normally in the position shown in Fig. 2 by a spring 38. A suitable buffer 39 is provided to take the shockimparted to the lever by the vise-frame. When the vise-frame is thrown back, the lower end of the starting-lever is thrown forward, thus operating the arm 33 and throwing the pawl 29 out ot' engagement with the stop 30, thus permitting the spring 27 to operate the clutch and start the machine.

Automatic .Stopp ing mechanism. Connected with the vise-frame is an arm 40, the lower end of which, as illustrated, is pivotallyconnected to one of the trunnions M, while the upper' end is connected to the rack 2 bya pin 41, which engages a zigzag slot 48 in the back On the upper end of the arm 40 is a switch device attached to a horizontal extension 42 of the arm. The extension 42 has an inclined or cam surface 43 and above this surface a plate 44, havingaspringtongue 45, overlying theincline 43 and in line with the uppersurface 46 of the forward end of the extension 42. The plate 44 is adjustably connected to the arm 40 by means of screws 47, passing through slotted openings in the plate. The free end of the spring 45 is located close to the upper end of the incline 43, as shown in Figs. 7 and 8. The

clutch is thrown out of engagement with the' drive-wheel by means of an arm 51, carried by a vertically-movable rod 50. The arm 51 carries a roller 52. The upper end of the rod 50 is connected to a lever 53, pivoted to the frame of the machine at 54, the forward end of which lever has a projection 55, adapted to ride on the incline 43 during the rearward movement of the vise and on the spring-plate 45 during the forward movement of the vise. A spring 56 constantly tends to raise the rod 50 to bring the roller 52 on arm 5l into the path of a pair of diametrically opposite cams 57 on the rear of the disk J.

The operation of the stoppin g devices above described is as follows: As the vise-frame is thrown backward to carry the broom to the sewing mechanism the forward end 55 of lever,53 rides up the incline 43 onto the forward upper surface 46 of the arm 40. The

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bracket 49 upon the clutch-operating frame 3l moves said frame 3l to the rear and disengages the clutch. A spring 58, Fig. 3,

throws the stop-arm 29 up in front of the stop` 30 and locks the clutch out of engagement.

As the stitches in each line of stitching are staggered or alternated with relation to the stitches in the adjacent line or lines, it follows that the last stitch in certain lines will be nearer the edge of the broom than the last stitch in the alternate lines, and it istherefore desirable to varythe stoppage of the machine to correspond with the last stitch in each seam. This is accomplished by means of the zigzag guide-groove 4S in the rear of the rack-plate 2, which groove automatically adjusts the stop-arm 40 as the rack plate moves down step by step for the successive rows ofst-itehing, as will be evident from inspection of Fig. 9.

To effect the promptl stoppage of the machine, a brake-shoe 59 is located under the disk J, being supported and guided by spring connections 60, Figs.v5, 10, and ll. A short toggle-lever 6l connects the frame 3l with the brake, the length of the toggle-lever being so adjusted that the rearward movement of the frame 31 will apply the brake to the disk J. The frame 3l consists of two bars, and the lever 6l is adj ustably connected to a cross-piece 62, which is pivotally connected to said bars, as shown in Figs. 10 and ll.

Automatic broom-dropping mechanism.- After the last stitch is taken in a line of stitching the vise-frame is released from the feedpawls and thrown into its forward position by the spring l. This movement eects the automatic opening ofthe vise K by means which are fully described in my prior patent and need not be herein specified in detail. When a new broom is inserted, the inner visejaws, which constitute the broom-support, are raised to their highest position by means of a forked lever 63, which engages the collar 6,

' connected to the inner vise-jaws by means of links 7, Figs. 4 and 5. The inner vise-jaws are sustained in the elevated position by a pawl-lever 64 and a rack 65, having adjustable teeth connected to the slide 4. The rack comprises a series of bars having projecting teeth 66 at their lower ends, said bars being located in a recess 67 in the slide 4 and clamped therein by a plate 68 and suitable bolts. The teeth of the rack are adjustable to vary the distance between rows of stitching. The pawl-lever 4 has a broad engaging pawl 69, adapted to engage any one of the teeth 66, and` pressed into engagement with said teeth by means of a suitable spring 70. yThe lower end 7l of the pawl-lever extends into the path of a swinging arm 72, attached to a block 73, connected to a collar 74, sliding on thetubular shank of the rvise-frame. The pivoted arm 72 engages and operates the pawl-lever 64 as tho collar 74 descends; but it is free to swing back and out of the path of the pawl-lever as the collar 74 rises. The collar 74 is connected, by means of togglelevers 75 and levers.76, with the jaws ofthe vise K, and said collar is lowered to open the vise and raised to close it, as described in the patent above referred to.

The operation of the broom-lowering devices will be apparent from the above description and need only be briefly recapitulated. When a new broom is inserted in the vise, the inner jaws 3 are raisedpuntil the lowest tooth 66 of the rack 65 rests upon the pawl 69. The vise K is then closed and the first seam sewed. When the vise K is opened, the pivoted arm 72 engages the pawllever momentarily and permits the rack- 615 and its connected parts, including the rack 2 and the inner vise-jaws 3, to drop one tooth, the pawl 69 engaging the next to the lowest tooth of rack 65. This is repeated for each, seam, the dropping of the broom being entirely automatic. The slide 4 and its connections are guided by means of a rod 77, which slides in an opening in the frame, and a fixed rod 7 S, which passes through an opening in the slide. Y

Devices for supporting the binden-Pivoted to the vise-frame are a pair of fingers 79, which are curved inwardly at their upper ends and caused to impinge upon the opposite ends of the broom by a spring S0. The inwardly-turned tips 8l of the fingers 79 are located slightly above the edge of the visejaws in order to support the binder at a sucient height` to permit the needles to pass under it. The lower portions of the fingers 79 are inwardly curved, forming cams 82, whichcams are engaged by vertically-movable rods 83, attached, by means of connecting-pieces 84, Vto the collar 74, which operates the visejaws. When the collar is raised and the visejaws close, the spring-fingers are freed from the rods 83, and they close upon the broom, as shown in full lines in Fig. 5. When the collar is drawn down to open the vise-jaws, the rods 83 engage the cam-faces of the tingers and throw the finger-tips away from the broom, as shown in dottedv lines in Fig. 5. The binder-supporting ngers are therefore operated automatically. The lower portions of the cam-surfaces S2 assume a vertical direction when the fingers are sufficiently open, and the continued downward movement of the rods 83 after reaching these vertical portions of the cam-surfaces 82 do not cause any further separation of the iinger-tipsrSl.

As shown, the sliding collar 74, which op- IOO erates the vise-jaws, is connected to a treadlelever 85 by means of links 86, the treadlelever being mounted on a shaft 87. Upon the shaft 87 is a hand-lever 88, by means of which the vise may also be operated. On the shaft 32 is another hand-lever S9, by means of which the stop-arm 29 may he thrown out by hand to start the machine.

In the above specification I have described in detail the particular embodiment of the invention which is illustrated in the drawings. It will be evident that the broader features of my invention are not limited to the devices illustrated and described, but may be embodied in many equivalent devices.

Without, therefore, limiting myself to the construction and arrangement of parts illustrated and described, I claim- 1. In a broom-sewing machine, the combination with sewing mechanism and feeding mechanism, of means for automatically starting successive rows of stitching at alternately greater and less distances from one edge of the broom and for automatically stopping said rows at alternately greater and less distances from the opposite edge of the broom.

2. In a broom-sewing machine, the combination with the sewing mechanism, and a movable vise-frame, of a broom-support, and arack movable longitudinally of said frame, said rack having elongated teeth, and feedpawls arranged to engage said teeth in the different positions of the rack.

3. In a broom-sewing machine, the combination with the sewing mechanism, of feeding mechanism comprising a rack having elongated teeth and pawls cooperating with successive portions of said teeth to feed for successive rows of stitches, and means for causing the pawls to engage two different teeth of the rack at the beginning of two adjacent rows of stitches whereby the stitches in the rows are staggered.

4. In a broom-sewing machine, the combination with the sewing mechanism, and the vise-frame, of feeding mechanism comprising feed-pawls, a rack adjustable with the broom longitudinally of the vise-frame, and a guard adjustable relatively to the rack and adapted to cover and render inoperative a portion of said rack, for the purpose set forth.

5. In a broom-sewing machine, the combination with the sewing mechanism, of feeding mechanism comprising a rack having elongated teeth and pawls coperating with successive portions of said teeth to feed for successive rows of stitches, and means for preventing the pawls from engaging portions of the front and rear teeth of the rack, whereby the rows of stitches are staggered.

6. In a broom-sewing machine, the combination with the sewing mechanism, and a movable vise-frame, of feed-pawls, and a rack connected with and movable longitudinally of the vise-frame and provided with radiallyarranged teeth, for the purpose set forth.

7. In a broom-sewing machine, the combination with the sewing mechanism, of a movable vise-frame, an adjustable inner vise for supporting the broom, a rack having radiallyarranged teeth, and pawls cooperating with said rack, said rack being connected to the vise frame and adjustable longitudinally thereof simultaneously with the inner vise, for the purpose set forth.

8. In a broom-sewing machine, the combination with the sewing mechanism, and feedpawls pivotally connected to the main frame, of a swinging vise-frame,a feed-rack mounted on the vise-frame and having elongated radially-arranged teeth, inner vise-jaws for supporting the broom, and means for simultaneously adjusting said rack and said inner visejaws longitudinally of the vise-frame, for the purpose set forth.

9. In a broom-sewing machine, the combination with the sewing mechanism, of a movable vise-frame, the rack adjustably mounted on said vise frame and having elongated teeth, and the adjustable guard for rendering portions of said rack inoperative, the edge of said guard being staggered whereby certain portions of the guard cover more teeth than other portions thereof, for the purpose set forth.

10. In a broom-sewing machine, the combination with the sewing mechanism, and feedpawls, of the movable vise-frame, the vertically-adjustable rack thereon, means for adj usting the rack laterallyof the vice-frame, and an adjustable guard for the forward portion of said rack.

11. In a broom-sewing machine, the combination with sewing mechanism, of a movable vise-frame, the rack adjustable thereon', feed-pawls, an adjustable guard at the forward edge of the rack having staggered surfaces on its rear edge, and means for preventing the pawls from engaging portions of the rear tooth in the rack whereby the stitches in successive lines are staggered, substantially as described.

I2. In a broom-sewing machine, the combination with the sewing mechanism, and a vise-frame movable to and from the sewing mechanism, of automatic starting devices, and means for automatically bringing the starting device into operation at different points in the travel of the vise-frame for different seams for the purpose of beginning the seams at different points and staggering the stitches.

I3. In a broom-sewing machine, the combination with the sewing mechanism, a movable vise-frame and broom-holding devices adjustable longitudinally of the frame, of automatic starting mechanism including a device movable with the broom and provided with staggered surfaces, and a member arranged in the path of said device and adapted to be moved thereby when the vise is moved to the sewing mechanism, said member operating to effect the starting of the machine.

14. In a broom-sewing machine, the combi- IOO IIO

nation with the sewing mechanism, a movable vise-frame, and a rack vertically adjustable on said vise-frame, of automatic starting devices, including a device movable with the rack and provided with staggered surfaces, and a member arranged in the path of said device and adaptedto be moved thereby when the vise is moved to the sewing mechanism, said member operating to effect the starting of the machine.

15. In abroom-sewing machine, the combination with the sewing mechanism, a movable vise-frame, vand a rack, having elongated teeth, vertically adjustable on said ,viseframe, of automatic starting devices, including an adjustable guard connected to the rack and provided with staggered surfaces, anda part arranged in the path of said guard and adapted to be moved thereby when the vise is moved to the sewing mechanism, said part operating to effect the starting of the machine.

16. In a broom-sewing machine, the combination withY the sewing mechanism, and a movable vise-frame, of vertically-adjustable inner vise-jaws, avertically-adjustable rack connected to said vise-jaws, a guard for said rack having a staggered rear edge, a startinglever having a portion extending .into the path of the guard, and automatic starting devices adapted to be released by said lever.

17. In a broom-sewing machine, the combination with the sewing mechanism, of a vise movable to and from said mechanism, and means for automatically stopping the machine comprising a vertically-movable rod, a lever connected to said rod, and a switching device connected to the movable vise and adapted to operate said stopping-lever suddenly at the end of each row of stitches, said switching device comprising an inclined surface and a spring-plate cooperating therewith.

18. In a broom-sewing machine, the combination with the sewing mechanism, the vise, and means for feeding the vise to the sewing mechanism, of a switching device connected to said vise comprising an incline and a springplate overlying said incline, the lever having a part adapted to ride on the incline during the rearward movement of the vise and on the spring-plate during the forward movement, and the automatic stopping devices adapted to be brought into immediate action as the lever drops from the rear end of the spring-plate, as set forth. l l

19. In a broom-sewing machine, the combination with the sewing mechanism, the vise, and means for feeding the vise to the sewing mechanism, of'automatic stopping mechanism and means for automatically bringing said stopping mechanism into action when the needles areat alternately greater and less distances from the edge of the broom in successive rows of stitches.

20. `In a broom-sewing machine, the combination with the sewing mechanism, and the vise, of a feed rack adjustable relatively to the vise for diierent rows of stitches, ay

lzigzag guide on said rack,and automatic stopping devices controlled by said zigzag guide to effect the stopping of the machine at different points in the travel of the vise for different rows of stitches, as set forth.

2l.. In a broom-sewing machine, the combination with the sewing mechanism,and a vise movable to and from said mechanism, of a vertically-movable broom-support, and automatically-controlled means for feeding said support vertically to bring the broom into position for successive rows of stitches.

22. In a broom-sewing machine, the combito bring it into position for successive rows of stitchesfsaid means being automatically controlled by the opening movement of the vise.

24:. In a broom-sewing machine, the combination with the sewing mechanism, of a vise movable to and from said mechanism, a movable broom-support within the vise, a rack and pawl for vertically adjusting said broom-- support, and an arm in the path of said pawl adapted to operate the same as the vise is opened and closed', whereby the b room is automatically lowered, substantially asde scribed.

25. In a broom-sewing machine, the combination with the sewing mechanism, of'a vise movable to and from said mechanism, a broom-support adjustable relatively to said vise, a rack comprising a series of teeth adjustably connect-ed to said support, a pawl adapted to engage said teeth successively, and means for automatically operating the pawl to locate the broom for successive rows of stitches.

. 26. In abroom-sewing machine, thecombination with the sewing mechanism, of a vise movable to and from said sewing mechanism, a movable broom-support within the vise, a rack and pawl for adjusting said broom-support to shift the broom into position for successive rows of stitches,'and means for automatically operating said rack and pawl to shift the broom support when the vise is opened to release the broom.

27.' In a broom-sewing machine, the combination with sewing mechanism, a vise, and means for feeding the vise to the sewing mechanism, of an automatic starting device, and adj usting means whereby said device may be brought into action at different positions of the vise to l'ocate the first stitch properly for brooms of dierent widths.

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28. Ina broom-sewing machine, the combi nation with the sewing mechanism, the vise, and means for feeding the vise to the sewing mechanism, of a positive stop for bringing the vise to rest in position for the first stitch, adjusting means whereby said vise may be stopped in different positions to adapt it to begin sewing on brooms of different Widths, and means for automatically starting thesewing mechanism as the vise is stopped.

29. In a broom-sewing machine, the combination with the sewing mechanism, and a vise having a swinging movement in a vertical plane to and from said sewing mechanism, of means for feeding the vise step by step relatively to the sewing mechanism, and a positive stop for locating the vise in position for starting the sewing, said stop comprising a stationary part constituting an abutment, and a part movable with the vise coperating with said abutment, one of said parts being adjustable to adapt the stop for brooms of different widths.

30. In a broom-sewing machine, the combination with the sewing mechanism, a vise and means for feeding the vise relatively to said mechanism, of a binder-support comprising a pair of fingers having tips adapted to engage the edges of the broom above the vise,

and means for automatically moving said. 3o fingers toward and away from the broom at proper intervals.

3l. In a broom-sewing machine, the combination with the sewing mechanism and a vise movable relatively to said mechanism, of a 35 binder-support consisting of a pair of movable fingers having inturned points, means for opening and closing the vise, and automatic means for simultaneously moving the ingers away from and toward each other, the 4o fingers being arranged to move inward as the vise is closed and impinge upon the edges of the broom above the vise.

32. In a broom-sewing machine, the combination with the vise, of a binder-support com- 45 prising pivoted fingers having inwardlyturned tips adapted to impinge upon the broom above the visejaws, cam-surfaces upon said fingers, and vertically-movable parts arranged to engage said cam-surfaces 5o and spread the fingers todisengage the broom when the vise is opened.

In testimony whereof I aflix my signature in presence of two witnesses.

ANDREW E. MILLER. Witnesses:

HOWARD D. ADAMS, J. HENRY STROHMEYER.

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