US3610450A — Front end loader and method of forming same

Claim 1

Independent Claim 310 words

In a hydraulically operated tilt-on loader for tractors having a forwardly extending boom carrying an implement on the front end thereof and subframe on the rear end cooperating with one another to define a base adapted to support said loader in Freestanding position, said subframe being connected to the boom for pivotal movement about a transverse axis and having a pair of transversely spaced sideframe elements adapted to receive the front end of a tractor therebetween, and a hydraulic servomotor connectable to a source of fluid under pressure connected between the boom and subframe while the rear end of the boom is independently supported, the improvement which comprises: a pair of channel-shaped rails mountable upon opposite sides of a tractor ahead of the rear axle so as to define transversely spaced parallel tracks having the mouths thereof opening forwardly; front and rear pairs of pivots members carried by the subframe in longitudinally spaced relation to one another on the inside of the sideframe elements, said rear pair of pivot members being positioned and adapted to enter the mouths of the tracks upon forward movement if the tractor relative thereto and to support the rear end of the boom while the subframe is lifted free of the ground, said front air of pivot members also being positioned and adapted to enter the mouths of the tracks upon further forward movement of the tractor relative thereto with the subframe raised into longitudinal alignment with the rails, and said front and rear pairs of pivot members cooperating when located within the tracks to support the boom in cantilever fashion so that the implement can be raised free of the ground; and, latch means carried by at least one rail in position to enter the track associated therewith and releasable engage a pivot member so as to prevent relative forward movement of the subframe.

Claim 2

Dependent Claim 310 words

In a hydraulically operated tilt-on loader for tractors having a forwardly extending boom carrying an implement on the front end thereof and subframe on the rear end cooperating with one another to define a base adapted to support said loader in Freestanding position, said subframe being connected to the boom for pivotal movement about a transverse axis and having a pair of transversely spaced sideframe elements adapted to receive the front end of a tractor therebetween, and a hydraulic servomotor connectable to a source of fluid under pressure connected between the boom and subframe while the rear end of the boom is independently supported, the improvement which comprises: a pair of channel-shaped rails mountable upon opposite sides of a tractor ahead of the rear axle so as to define transversely spaced parallel tracks having the mouths thereof opening forwardly; front and rear pairs of pivots members carried by the subframe in longitudinally spaced relation to one another on the inside of the sideframe elements, said rear pair of pivot members being positioned and adapted to enter the mouths of the tracks upon forward movement if the tractor relative thereto and to support the rear end of the boom while the subframe is lifted free of the ground, said front air of pivot members also being positioned and adapted to enter the mouths of the tracks upon further forward movement of the tractor relative thereto with the subframe raised into longitudinal alignment with the rails, and said front and rear pairs of pivot members cooperating when located within the tracks to support the boom in cantilever fashion so that the implement can be raised free of the ground; and, latch means carried by at least one rail in position to enter the track associated therewith and releasable engage a pivot member so as to prevent relative forward movement of the subframe.

Claim 3

Dependent Claim 19 words

The improvement as set forth in claim 1 in which: the rear pair of pivot members are transversely aligned.

Claim 4

Dependent Claim 35 words

The improvement as set forth in claim 1 in which: abutment means are carried by at least one of the rails positioned to engage some portion of the subframe and limit the rearward movement thereof.

Claim 5

Dependent Claim 39 words

The improvement as set forth in claim 1 in which: retaining means are carried by the rear ends of the rails positioned and adapted to receive the corresponding ends of the subframe and prevent the latter from spreading apart.

Claim 6

Dependent Claim 42 words

The improvement as set forth in claim 1 in which: the latch means is located adjacent the forward end of the rail in position to successively engage both the rear and front pivot members as the subframe moves into fully latched position.

Claim 7

Dependent Claim 38 words

The improvement as set forth in claim 1 in which: the latch means is located adjacent the rear end of the rail in position to engage the rear pivot member as the subframe moves into fully latched position.

Claim 8

Dependent Claim 136 words

The improvement as set forth in claim 1 in which: at least one channel-shaped rail is provided with a longitudinally extending slot in the upper flange thereof positioned and adapted to receive the latch means; and, in which the latch means comprises a plate pivotally attached atop the upper rail flange ahead of the slot with a substantial portion thereof projecting downwardly through the latter into the track in the path of at least one of the pivot members moving therethrough, the leading edge of said plate defining a cam surface adapted to lift said latch means to an elevated position where the pivot means will pass rearwardly therebeneath upon actuation by the latter, and the trailing edge of said plate defining a stop adapted to block the forward movement of a pivot member located therebehind.

Claim 9

Dependent Claim 24 words

The improvement as set forth in claim 3 in which: the abutment means comprises an end plate closing the rear end of the rail.

Claim 10

Dependent Claim 29 words

The improvement as set forth in claim 3 in which: the abutment means comprises a sideplate located at the rear end of the track connected between the flanges thereof.

Claim 11

Dependent Claim 70 words

The improvement as set forth in claim 4 in which: the retaining means comprises a U-shaped member attached to the rear end of each rail so as to cooperate with the web and flanges thereof to define a forwardly opening eye; and, in which pin means project rearwardly from The rear end of each sideframe element in position to enter the corresponding eye upon relative rearward movement of the subframe.

Claim 12

Dependent Claim 85 words

The improvement as set forth in claim 4 in which: each of the rear pair of pivot members includes a shank portion adjacent the sideframe element terminating in an enlarged head remote therefrom; and, in which the retaining means comprises a sideplate bridging the flanges of each rail so as to box-in the rear ends thereof, said plates each including a forwardly opening slot positioned and dimensioned to receive the shank portion of each rear pivot member while holding the head thereof within the track.

Claim 13

Dependent Claim 48 words

The improvement as set forth in claim 7 in which: the plate includes an ear projecting rearwardly beyond the rear end of the slot and along the top of the upper flange, said ear providing a stop adapted to limit the penetration of said plate into the track.

Claim 14

Dependent Claim 46 words

The improvement as set forth in claim 10 in which: both pins are provided with an inwardly and rearwardly inclined cam surface on the outside thereof at their rear ends adapted to engage the U-shaped member and force the sideframe elements in snug against the rails.

Claim 15

Dependent Claim 35 words

The improvement as set forth in claim 10 in which: both pins have the rear ends thereof tapered both top and bottom and on the outside so as to guide same into their corresponding eyes.

Claim 16

Dependent Claim 33 words

The improvement as set forth in claim 11 in which: each sideplate has the slot therein flared at the mouth thereof so as to guide the shank of the rear pivot member therein.

Claim 17

Independent Claim 214 words

The method for mounting a tilt-on loader onto a tractor equipped with horizontally disposed forwardly opening transversely spaced parallel channels on opposite sides of its front end where said loader includes a forwardly extending boom having an implement attached to the front end thereof and a subframe pivotally attached to its rear end for movement about a transverse axis that cooperate with one another to define base adapted to support said boom in freestanding position, and wherein said subframe includes a pair of transversely spaced coplanar sideframe elements adapted to receive the front end of the tractor therebetween that carry longitudinally spaced pairs of pivot members projecting inwardly therefrom in position to enter said tractor-mounted channels, which comprises: guiding the tractor forward between the sideframe elements with the loader in freestanding position until the rear pair of pivots enter the mouth of the channels, raising the subframe into position where the front pair of pivots are longitudinally aligned with the mouths of the channels while supporting the rear end of said loader with the tractor by means of the rear pivots within the channels thereof, and moving the tractor forward until both pairs of pivots are confined within the channels whereby the boom can be actuated to lift the implement free of the ground.

Claim 18

Independent Claim 214 words

The method for mounting a tilt-on loader onto a tractor equipped with horizontally disposed forwardly opening transversely spaced parallel channels on opposite sides of its front end where said loader includes a forwardly extending boom having an implement attached to the front end thereof and a subframe pivotally attached to its rear end for movement about a transverse axis that cooperate with one another to define base adapted to support said boom in freestanding position, and wherein said subframe includes a pair of transversely spaced coplanar sideframe elements adapted to receive the front end of the tractor therebetween that carry longitudinally spaced pairs of pivot members projecting inwardly therefrom in position to enter said tractor-mounted channels, which comprises: guiding the tractor forward between the sideframe elements with the loader in freestanding position until the rear pair of pivots enter the mouth of the channels, raising the subframe into position where the front pair of pivots are longitudinally aligned with the mouths of the channels while supporting the rear end of said loader with the tractor by means of the rear pivots within the channels thereof, and moving the tractor forward until both pairs of pivots are confined within the channels whereby the boom can be actuated to lift the implement free of the ground.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-10-04	1975-04-05	1975-10-05	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-10-04	1979-04-05	1979-10-05	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-10-04	1983-04-05	1983-10-05	$7700.00	Window Closed / Lapsed

Front end loader and method of forming same

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