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Publication numberUS98711 A
Publication typeGrant
Publication dateJan 11, 1870
Publication numberUS 98711 A, US 98711A, US-A-98711, US98711 A, US98711A
InventorsLuman Rogers
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improved hay-tork
US 98711 A
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Description  (OCR text may contain errors)


`Letters Patent No. 98,711, dated January 11, 1870.


The Schedule referred to in these Letters Patent and making part of the same To all whom, it may concern:

Be it known that I, LUMAN ROGERS, of the city of Pittsburg,vin the county of Allegheny, and State of Pennsylvania, have invented a new and useful Im' provenient in Hay-Forks or Elevators; and I do hereby declare the following to be a full, clear, and exact description thereof', reference being had to the accompanyling drawing making a part of this specification, in w ich r Figurel is a side elevation of my improved hayelevator, Vwith the devices in the position they occupy when the fork orI elevator is ready for use.

Figure 2 is an edge view, and

Figure 3 is a sectional View of the same.

Figure 4 is also an ,edge view of the same, with the devices in proper position for hoisting a load of hay into which the point and barbs have been thrust, and

Figure 5 is aside elevation of the same devices, in the position'they'occnpy immediately after the discharge of a load, and before the hinged jaw is brought to its place and locked, preparatory to taking a new load.

Like letters of reference indicatelike parts in each.

My invention relates to that class of hay-forks or elevators-connnonly known as harpoon-forks; and

The nature of it consists--` First, in combining, with the centre-rod, which carries and operates the barbs or prongs, a pair of jaws, one, at least, of which is hinged, or in a similar manner connected with the other jaw, or with the shaft or stem, such jaws being provided with recesses, which, at the different points of adjustment of the fork, embrace the centre or main pin ofthe sheath Second, the construction and arrangement, within the handle of the4 fork, of a locking-device, by which to lock and unlock the hinged jaw or jaws; and

rIhird, in the arrangement of a guard on the sheath to protect the movable jaw and locking-device.

' 'lo ena-ble others skilled in the art to make and use `my invention, l will proceed to describe its construction and mode of operation.

In the sheath, barrel, or guiding-box a, the centrerod I1 operates with a reciprocating motion, when thrust downward, throwing out the barbs b through mortises a in the sides a of the sheath, and nice versa..

The sheath a is-pointed at its lower end, as shown at a", so as the more easily to enter the hay. This point a connects the opposite sides a of the sheath, at their lower ends, while, at their upper ends they are held together, and at the proper distance apart, by a ,strong main rivet, c.

Attached to the upper end of the stem b are the jaws d d', at least one of which is'movable.

The construct-ion I prefer is asshown in the drawings, in which the fixed jaw dy is a prolongation ofthe centre-rod, though set a litt-le lto one side, so as tomake room for the movable jaw d, which latter is also hinged to the former at-aflittle distance from its lower end, by a hinge-pin, e, which passes through the jaw d', and through flanges c'of the jaw (I, the iianges e and the lower face ofthe fixed jaw d making a seat or box for the lower end of the movable jaw This hinging is so done that the movable jaw d may have a slight play, as presently to be described.

Recesses or eyes,s s', are made in the inner faces of the jaws 'd d', each large enough to admit the main piu c ofthe sheath a'.

A spiral spring, j, is inserted in the box-like cavity between the jaws at their lower end, and below the hinge e. Y

To thelixed jaw d is attached a handle, h, of ringlike -orlo'ther suitable shape.

The upper end ofthe movable jaw el' plays through -a slot in itslbase.

In another slot in the upper end of the inner face of the jaw d is hinged a dog, g.

This dog q has, neai'its forward end, a mortised catch, t', which engages a shoulder, t', on the jaw tl, and, at its rear end, a hook-shaped lug, o, which enters a morytise in the upper end ot' the jaw d', and bears against a spiral spring, o', therein inserted.

For convenience of manipulation, it also has a ring, on, at its forward end, and a rope or cord, m', is fastened to a trigger, a, on its upper side, and passes out through a hole in the opposite side of the handle. 1

`A guard, p, projecting out in as many directions, and to such distance ,as may be desired, is attached to the upper end of the sheath a.

' The operation is as follows: v

'lhe devices being in the position shown in iig. 1, the operator, taking the fork by the handle h, thrusts itdownward into the wad of hay, theguard 1J pressing' the surface of the hay down, to keep it from interfering with the free operation of the dog g.

He then raises the ring-end of the dog g, by which the catch t is disengaged from the shoulder t', and presses it back till the movable jaw cZ, turning on its hinge-pin e, releases its hold on the main rivet c.

'He then presses down on the handle h, so as to drive the jaws d d and centre-rod b downward, by which the barbs b b are forced out, as shown in fig. 4.

The dog gis then returned to its place, in fig.1,by

which the jaws (Z d are made to embrace the main rivet c, at their upper eye or recess s, whereby the barbs b' are locked in the position they occupy in tig. 4.Y Hoisting-power is then applied to the handle h the fork and its wad are raised to the place where the loadA is vto be deposited, when a slight pull or jerk ou the cord fm releases the'dogg, and frees the jaws d dfrom their hold at the upper eye s, on the main alivel: c.

f 'lhe sheath a being then unsupported, `falls, the barbs b' b slide through the mortises a a', the main rivet c comes down to the lower eye s', the load is discharged, and, by the action of the springs f o, the jaws d d are again brought together, and the dog g restored to its locking position, as in fig. 1, and the operation is continued.

lhe dog g, it will beobserved, is soarranged in the handle h as to operate in the plane of the handle, and so guarded by it from injury.

I am aware'that the sheath, centre-rod, point, and

v barbs have been separately in use, and that harpoonforks of various const-ructions'have been made.

I am also aware that various forms of levers have been used for shifting a movable bolt or catch in locking and unlocking the distended barbs or prongs, but I am not aware ofthe construction or use, prior to the date of my invention, of a pair of jaws in a hay-fork or elevator, which, by their conjoint action, embraced, engaged,'or bore upon any fixed part of the stem, case, or sheath, in connection with which such jaws were operated, so as to lock the distended barbs or prongs. Hence I -do not limit my invention to the use of a rivet, c, as a part of the locking device, since the form of the jaws may be so changed that they shall, by their conjoint action, lock on some other part of the stem, case, or sheath; but

What I claim herein as my invention, and desire t0 secure by Letters Patent, is

l. The construction, in a harpoon bay-fork or eievator, of a pair of jaws, one, at least, of which is hinged,

rsuch that, by their conjoint action, they shall lock the distendedprongs or barbs, by embracing' or engaging a rivet, c, or some other xed part of the stem, case, or sheath, substantially as above set forth.

2. The arrangement, inside the handle of a harpoon hay-elevator, of a dog, g, as a locking-device, in combination with a pair of jaws, d d', substantially as def scribed.

3. The jaws d d, one hinged at a point intermediate betweenits ends, and having a spring, f, in combination with adog, g, and its spring o', arranged substantially as described.

In testimony whereof, I, the said LUMAN ROGERS,

have hereunto set my hand4 v LUMAN ROGERS.

Witnesses A. J. MELLIs, R. C. WBENSHALL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4413301 *Apr 21, 1980Nov 1, 1983Raychem CorporationCircuit protection devices comprising PTC element
US4475138 *Sep 20, 1982Oct 2, 1984Raychem CorporationCircuit protection devices comprising PTC element
Cooperative ClassificationA01D9/00