US701838A - Leather-stretching machine. - Google Patents

Description

`NLL 701,838

.1. CALDWELL. LEATHER STRETCHING'MACHINE.

Patented-June I0, |902. 4

(Application'filed Jan. 6, 1902,)

(No Model.)

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35 in section on the line fr: of Fig. 1.

' NITED STATES PATENT EEICE;

JOHN CALDWELL, OE MINNEAPOLIS, MINNESOTA, AssiGNoR rro W. s. NOTT A ooMPANYoE.M1NNEAroL1s, MINNESOTA, Al CORPORATION OE MINNE- SOTA.

LEArHEa-s'raEToi-HNG MACHINE SPECIFICATION forming part of .Letters Patent No. 701,838, dated .Tune 10, 1902. Y

pplioationillled January 6,1902. Serial No. 88,575. (No model.)

' To' aZZ whom it may concern:

Beit known that I, JOHN CALDWELL, a citizen of the United States, residing at Minne' apolis, county of Hennepin, and State of Min- 5 nesota, have invented certain n ew and useful Improvements in LeatheraStretching Devices, of which the'following is a specification.

My invention relates to the clamps or devices nsed in connection with leather-stretchr ing "machines for holding the ends of the leather during the operation of stretching it andthe object of the present invention is iniprovementof the means for connecting such leather-holders to the heads or other approt 5 priate parts of the stretching mechanism.

Stated more specifically, my improvements relate to the means for making adjustable pivotal connection between the leather-holding device and the stretcher-head, and de-l scribed in a general way the improved devices consist of a leatherholder having a snitable stud on its rear portion and a coupling device provided with a laterally-elongated slot or a corresponding series of holes for reeg ceivling the holder-stud and means for adjustably connecting the `coupling device to the stretching mechanism. Such improvements 'are illustrated in the accompanying drawings,

in Which- 3o Figure 1 is a plan Niew of a portion ofZ a stretcher head and frame equipped with my improved coupling devices. view of theleather-holder and couplingdevice and shows aportion of the stretcher-head Fig. 3 is a detail of the coupling device viewed from beneath, and Fig. 4' shows a modification of the latter device.

In the drawings the reference-number 1 desf 4o ignates one of the sides of an ordinary rectangular stretcher-frame, and r2 its stationary' head, secured thereto by bolts or in any suitable way. l The portion of the apparatus containing tne stationary head is selected for 45 convenience of illustration; but my improvements are applicable as well to the slidable head of the machine. u y

On the surface of the head (which may be ef wood) is secured a metal plate 3, extending 5o from side to side of the head and having a series of slots-1 a suitable distance apart and Fig. 2 is a side' extending parallel with the Vframe sides 1in extending in vertical or suitably-slanting direction.

The coupling device may consist of a plug or short metal body 6 of proper size to enter a slot 4: and having on its side walls suitable notches or irregularities 7 for engaging the irregularities of surface of the slot-walls to hold the plug lagainst movement along the slot when subjected` to tension. On the upper surface ot' thevplug is placed a plate or other suitable body of metal 8, and the two members are connected bya pivot 9, so that the plate may turn freely on the plug. i For convenience in handling the device the plate Sis provided' Witha handle 510, Vwhichjmay be formed on the upper end of the pivot 9. `The forward end ofthe plate 8 is preferably pro- .vided with' la' slot 11 or opening for making connection with a leather-holder, and the' ably concaved. toward the rear of the plate S-that is, indirection away from the leatherholder. The leather-holder selected for illustration isv of the clamp form, comprising Va base-plate V15? and an upper movable jawlf, the base member. having its tailiece 15 provided with a'pin or stud or'p ejection 16, adapted-v to enter the slot 11, and thereby' pivotallyconnect the holder to the coupling device and permit such point oli connection tobe automatically varied in lateral directionand allow the holder to swing freely under tension. 1

In the imodication-` shown in Fig. 4 aseries of lseparate holes 17 is substituted for the single opening 11; but it is 'apparent that this construction while permitting manual will not serve to effect automatic lateral adjustmentof the pivotal point 'of connection of the holder relative to the coupling device.

In putting the devices to use, as illustrated.'

in Fig. 1, a series of the holders may be made to engage portions of the irregular end of a side or other division of leather 18 and the leather and the hol ers placed on the stretcherhead, and the lio `ders may then be snces- 75 outer wall 12 of the slot or opening is prefer-` sively connected to the head by inserting the plugs of the coupling devices at proper'points in the slots '4 to enable the holder-studs to enter the openings in the coupling devices.-

The pivotal connection of the plates 8 to th'e plugs 6 enables them to be turned laterally when necessary to proper position to engage the holder-studs and serve also thereafter to permit free swinging movement of the holderswith respect to the plug 6. v

I do not limit myselfto the specific means otal connectionto the holder.

Having described my invention, what' I claim is. Y i

1. The combination with a leather-holder having a projection in rear of its leather-en'- gaging means, Vof a coupling device provided with means for making laterally-variable pivotal connectionv with said projection, and means for-adjustably and pivotally connecting the coupling device to a part of a stretching mechanism, substantially as set forth.

'2. The combination with a leather-.holder having a projection in rear of its leather-engaging means, of a coupling device having means for making laterally-variable connection with said projection, and means for pivlotally and adjustably connecting the coupling device to a part of a stretching mechanism, substantially as set forth. v

3.. The combination with a leather-holder having a projection in rear'of its leather-engaging means, of a coupling device having a transverse slot convexed toward the leatherholder for mak-ing laterally-variable-pivotal connection with said projection, and means for adj ustably and -pivotally connecting the coupling device to a part of a stretching mechanism, substantially as set forth.

4'. The combination with a stretcher-head, of a series of leather-holders having projections in rear of their leather-engaging means, Aa corresponding series of coupling devices having means for making Alaterally-variable pivotal connection with said projections, and means for adj-ustably and pivotally connecting the coupling devices to the stretcher-head, substantially as set forth.

5. The combinationwith a stretcher-head having guideways extending parallel with the direction of tension of the machine, of a series of leather-holders having ,projections in rear of their leather-engaging means, a corresponding series of coupling devices having 'means for making laterally-variable pivotal i connection with said projections and provided With-pivotally-connected bodies adapted to be adjustably inserted and retained in said guideways, substantially as set forth.

In testimony whereof I have Vhereunto set my hand this 2d day of January, 1902.

WM. G. BRACKETT, P. I-I. GUNCKEL.l

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