US373949A - short - Google Patents

Description

2- Sheets-Sheet 1.

(No Model.)

J. N. SHORT. APPARATUS FOR FORMING HORSE RAKE TEETH. No. 373,949.

Patented Nov. 29, 1887.

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(-No Model.) 2 SheetsSheet 2'.

J.N.SHORT. APPARATUS FOR FORMING HORSE RAKE TEETH.

N0.373,949. 4 Patented Nov.29,1887.

UNITED STATES PATENT rrrcn.

JOHN N. SHORT, OF JOHNSTOWN, PENNSYLVANIA, ASSIGNOR TO THE OAMBRIA IRON COMPANY, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 373,949,61atecl November 29,1887.

Application filed July 9, 1887. Serial No. 243,842. No model.)

To all whom it may concern.-

Be it known that I, JOHN N. SHORT, a citizen of theUnited States, residing at Johnstown, in the county of Cambria and State of Pennsylvania, have invented certain new and useful Improvements in Apparatus for Forming Horse-Rake Teeth, of which the following is a specification.

As heretofore constructed the revolvingta ble of the machine on which the teeth are formed has had imparted to it a rotary reciprocating movement by hand or manual labor.

My improvement consists in original devices for clamping the tooth or piece of metal to be formed upon a table and releasing the same in such way that a continuous rotary motion may be given to the table, and in devices for communicating either continuous rotary motion or a reciprocating rotary motion to the table. I attain this object by the use of the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a side view,and Fig.2 a top View, of the machine with a part of revolving table broken away. Fig. 3 is a top view of table in position for receiving the piece to be formed.

Similar letters refer to similar parts in all the views.

Figures 4, 5, and 6 are teeth such as may be required to be formed. 1

The base-plate A, its legs or standards B, plate 0, stands J and L, bracket Z, and stand T constitute the frame-work: of the machine. Power is communicated to machine by means of straight and crossed belts running on loose friction-pulleys D and E on shaft'H, and cansing shaft H to revolve in either direction, according as they are put in contact with either pulley D orE by means of lever h, rod 2', and lever m. Bevel-pinion M on shaft H, gearing into toothed wheel N on shaft O,trausmits motion to table It on shaft 0.

In the ordinary hand-machine commonly used the method of clamping the teeth upon the table is by a spring.-box,which is liable to get out of order and is easily broken, and its form is such that it would be an impediment to the continued rotary motion of the table.

My devices for overcoming this difficulty are as follows On the top surface of table R is secured usual form, a, by the ordinary means of clamps s. e

I) is a tongue which swings on pin a, and is swung into the position shown in the drawings by spring 0.

d is a lever pivoted at t. The long end of this lever carries a roller, n, which, as the table R revolves, rolls on the inside of cam e in a part of its revolution. The short end of this lever carries a lug, 'd.

s isa spring attached to short end of lever d.

W is a roll carried by slide V, and is held against form a or the-piece to be bent to the curve of said form by means of weight 2'' through chain U.

f is a rod attached to friction-cones, with a roll, 1;, on its inner end, which, when said roll comes in contact with dogs p and t, attached to under side of table R, gives said table a reciprocating motion.

The operation of machine is as follows: The revolving table being in position shown in Fig. 3, the tooth-blank is inserted between the form a. and lug d, the longer end of lever (I being swung in toward the center of machine by the roller on the end of said lever coming in contact with the cam e. As'th'e table revolves, this roll leaves cam e and allows spring 8' to swing the lever and bring lug 62 against the blank or tooth, and thus clamp it and hold the same while it is being bent to the shape of the form. As the table continues its motion the tongue 12 passes. under the roll NV, and this bridges the roll over and past lug d. swings against the tooth or piece being formed, and thus guides the roll against it. Fig. 2 shows the tooth partly formed. As the table continues on its motion the tooth will be wholly formed, and after the end of tooth passes roll W the roll a on the end of lever d comes in contact with cam e and releases the tooth from the grip oflug d. The tooth is then removed and another inserted while roll at is passing along came, the table continuing in motion all the time and in the direction indicated by the arrow. To make some forms of teeth, as No. 4, &c., the table must have a reciprocating rotary motion imparted to it.

As the roll passes pin a this tongue 1)- This is accomplished by means of dogsp and t, Fig. 2. Pulley E revolves the table in direction shown by arrow until dogt strikes roll a on outside and moves it and the rodf toward the center of the table. This motion releases the friction-cone F from contact with E and moves it and cone G along shaft H into contact with pulley D, reversing the motion of the table, when it revolves in the other direction until dogp comes in contact with roll o on the insideand shifts the friction-cone back into contact with pulley E again, thus keeping up (ifdesirablc) an uninterrupted reciprocating rotary motion to the table. Any other form of clutch can be used in place of the one described.

Vhen desirable, the machine can be arranged so that when the table stops at the end of either of its motions it will remain stationary until started again by operating the frictiou-c1utch through hand-lever m, rod 2', and bell-crank lever h.

Sometimes in changing from one form of tooth to another it is desirable to turn the machine somewhat, so as to make it convenient for the workman to feed the machine. \Vhen this is done, the boxes I and K can be moved on the stands J and L, and thus keep shaft H in line with the shaft driving it.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a machine for forming horse-rake teeth, a main frame supporting a revoluble table having a former bolted thereon, and means to revolve this table, in combination with a counterweightcd roller arranged to hold the work in contact with the aforesaid former, and a grip formed by means of a projection on the short arm of a lever attached to revoluble table, the long'arm of said lever engaging with a stationary cam, the whole operating to grip and disengage the first inserted end of the tooth in the proper manner and at the proper time, substantially as and for the purpose set forth.

2. Inamachineforforminghorse-raketeeth, the combination of a main frame supporting a revoluble table, a former bolted thereon, a radially movable counterweighted roller to follow the conformation of the former, agripping mechanism to grip the first inserted end of the tooth to be operated upon, and aswinging tongue or bridge-piece to carry the movable roller smoothly over the aforesaid gripping 1neehanism,together with mechanism for revolving the table, substantially as and for the purpose set forth.

3. Inamachincforforminghorse-raketeeth, the combination of a main frame supporting a revoluble table, a former bolted thereon, a movable counterweighted roller to follow the conformation of the former and hold the work closely thereto, reverse mechanism to reverse the motion of the revoluble table, and stops or dogs on said revoluble table to engage with said reversing mechanism and automatically operate the same, substantially as and for the purpose set forth.

4. In a machine for forming horserake teeth, the combination of a main frame supporting a revoluble table, a former bolted thereon, a radially-movable counterweightcd roller following the conformation of the former and holding the work closely thereto, a device to grip the inserted end of the rake-tooth, consisting in a lever attached to the revoluble table, the short arm of which acts as the grip and the long arm of which engages with a fixed cam,and stops arranged on the said revoluble table to engage with and operate a suitable reversing mechanism, substantially as and for the purpose set forth.

JOHN N. SHORT.

\Vitnesses:

CYRUS ELDER, SIDNEY POSTLETHWAlTE, EDGAR G. TUT'ILE.

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