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Publication numberUS2864321 A
Publication typeGrant
Publication dateDec 16, 1958
Filing dateApr 12, 1955
Priority dateApr 12, 1955
Also published asDE1012949B
Publication numberUS 2864321 A, US 2864321A, US-A-2864321, US2864321 A, US2864321A
InventorsDeodat Clejan
Original AssigneePiggy Back Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Adaptors for landing gears of semi-trailer trucks
US 2864321 A
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Description  (OCR text may contain errors)

Dec. 16, 1958 D. CLEJAN 2,364,321

ADAPTORS FOR LANDING GEARS OF SEMI-TRAILER TRUCKS Filed April 12, 1955 4 Sheets-Sheet 1 INVEN TOR. d ape?" 625w? Dec. 16, 1958 D. CLEJAN 2,854,321

ADAPTORS FOR LANDING GEARS 0F SEMI-TRAILER TRUCKS Filed April 12, 1955 4 Sheets-Sheet 2 INVEN TOR.

Dec. 16, 1958 CLEJAN 2,864,321

ADAPTORS FOR LANDING GEARS OF SEMI-TRAILER TRUCKS Filed April 12, 1955 4 Sheets-Sheet 3 atent fitice ADAPTORS FOR LANDIYG GEARS F SEMI-TRAILER TRUCKS Deodat Clejan, New York, N. Y., assignor, by mesne assignments, to Piggy-Back, Incorporated, New York, N. Y., a corporation of New York Application April 12, 1955, Serial No. 500,761

14 Claims. (Cl. 105-368) This invention relates to adaptors for the landing gears of semi-trailer trucks to enable them to be used in railand-road transportation systems.

A system of rail-and-road transportation in which the present invention may be used is described in pending application Serial No. 464,535, filed October 25, 1954, by Etienne DeGrandpre, and owned by the owner of this application. The system therein described includes railway cars having narrow frames lying wholly between the inner sides of the wheels of their running gears and providing an outwardly facing track of narrow gauge for supporting road vehicles which have in addition to their road wheels inwardly facing flanged wheels mounted between the planes of the inner surfaces of their road wheels.

Pending application Serial No. 499,461, filed April 5, 1955 by Etienne DeGrandpre, and owned by the owner of the present application, describes a railway unit for use in such a system in which a semi-trailer provided with flanged wheels on its running gear and its landing gear is mounted on a track provided by the frame of a railway car and is held against forward and rearward movement on the car by means engaging part of its running gear. To keep the wheels mounted on the landing gear on the tracks, they are provided with hold-down means, which have a sliding engagement with the frame of the railway car so that the landing gear is free from the forward and rearward stresses between the road vehicle and the railway car.

In the railway unit described in said application, the trailer truck is provided with a special landing gear having flanged wheels. My invention is directed to avoiding the necessity of special landing gear by providing an adaptor which may be applied to the landing gears of standard semi-trailers intended forroad use to enable them to be used as part of a railway unit in a rail-and-road transportation system.

Objects of the invention are to provide an adaptor which may easily be secured to the landing gears of existing semi-trailer trucks and which will protect the landing gear from injurious strains.

A further object of my invention is to provide the adaptor, not only with wheels for running on a track, but also with hold-down means to keep the wheels on the track.

In accordance with my invention, the adaptor consists of alight beam whose ends may easily be attached at the lower ends of the legs of a semi-trailer landing gear and wheels mounted on the beam and positioned to run on a track whose gauge is diflerent from the separation of the legs of the landing gear.

In order that my invention may be clearly understood, I will describe in detail the specific embodiments of it which are shown in the accompanying drawings, in which:

Fig. '1 is a side view of part of a railway unit consisting of a trailer mounted on a railway car;

Fig. 2 is a transverse section of the railway car showing the construction of its frame which provides a track;

Fig. 3 is a side View, partially in section, of the lower Patented Dec. 16, 1958 end of one of the legs of a landing gear commonly used on semi-trailers;

Fig. 4 is an enlarged partial transverse section on the line 4--4 of Fig. 1 showing the landing gear of the trailer with an adaptor embodying my invention applied thereto;

Fig. 5 is an enlarged transverse section on the line 5--5 of Fig. 4;

Fig. 6 is a side view of the adaptor and associated parts partially sectioned on the line 6-6 of Fig. 5;

Fig. 7 is a horizontal section on the line 77 of Fig. 6 showing the mechanism for operating the hold-down means;

Fig. 8 is a side view sectioned on the line 8-8 of Fig. 7 showing the hold-down means and the operating mechanism;

Fig. 9 is a detailed horizontal section on the line of Fig. 6;

Fig. 10 is an enlarged view of a part of the hold-down operating mechanism shown in Fig. 7;

Fig. 11 is a side elevation of a modified form of adaptor embodying my invention; i

Fig. 12 is a plan view of the adaptor sectioned on the line 12-12 of Fig. 11;

Fig. 13 is a plan view of the adaptor sectioned on the line 1313 of Fig. 11;

Fi 14 is an enlarged transverse section of the adaptor taken on the line 1414 of Fig. 11 and Fig. 15 is an enlarged section on the axis of one of the track wheels of the adaptor.

The railway unit shown in Fig. 1 includes a railway car 10 and one or more semi-trailers 30 supported thereon.

The railway car 10 has a long narrow box-like frame 11 consisting of two long I-beams 12 secured together by cross-braces 13 in the form of short I-bearns. The ends of the frame of the car are supported on the bolsters 14 of four-wheel trucks 15 of usual construction. The frame 11 of the car lies wholly inside the planes of the inner surfaces of the wheels'of the running gear and the upper outer flanges 16 of the long I-beams 12 provide the rails of a narrow gauge track for supporting inwardly facing flanged wheels.

A semi-trailer, such as that shown in Fig. 1, is ordinarily provided with a so-called landing gear whose purpose is to provide means for supporting the trailer upright on a road when the trailer is detached from the tractor which supports one end of the trailer in travel on a road. The form of the landing gear of ordinary semi-trailers is shown in Figs. 3 and 4. It consists of two extensible and com tractible telescoped legs 35 extending downwardly from the body or chassis of the vehicle. To provide for extension and contraction of the legs 35, it is usual to have either the screw and gear mechanism 37 shown in Fig. 4 or an equivalent hydraulic mechanism. The lower end of each leg 35 ordinarily carries a T-shaped bearing piece 38 through which extends a shaft 39 on the ends of which are mounted two small wheels 36 called dolly wheels.

It will be noted that the ordinary landing gear construction is well adapted to sustain vertical loads but ill adapted to resist horizontal or twisting strains at the lower ends of its legs. The spacing of the legs of thelanding gear dilfers in different trailers, but is nearly always greater than the distance between the flanges 16' forming the track on the railway car on which the trailer is to be carried. g Y The adaptor '49 shown in Figs. 1 and 4 to 10 may be applied to any trailer regardless of the separation of its legs. The attachment consists essentially of a light rigid beam 41 in the form of a long trough having a semicircular bottom, vertical sides and external flanges 43 turned outwardly and downwardly. 'The trough 41 has a width sutflcient to receive the dolly wheels 36 of a trailer landing gear and a length suflicient to enableit extend between the legs of a trailer landing gear having the greatest separation customarily used in trailers.

The trough 41 is secured to the landing gear by placing it so as to receive the dolly wheels of the landing gear and thensecuring it to at least two of the dolly wheels by clamping strips 45. Each clamping strip 45 is curved to fit over the top of one of the dolly wheels and is provided at its ends with two hooks 46. The end of each hook passes around one of the flanges 43 of the trough and enters a recess of a crimped bar 47 secured between the depending portion of one of the flanges 43 and the trough. The upper ends of the hooks are threaded and provided with nuts 48 to engage the top of the clamping strip 45'and draw it down against the upper edge of the trough and the top of the dolly wheel 36. To prevent rattling, it is desirable to provide pads 49 of rubber or similar material between the clamping strip and the edges of the trough and between the clamping strip and the top of the dolly wheel.

It is apparent that the means which have been described provide for a quick and easy attachment of the trough 41 to the legs of the landing gear regardless of the amount of separation of the legs.

The beam or trough 41 is provided with two symmetrically placed pairs of wheels 42, each of a gauge to fit the track 16 of the railway car. The wheels 42 of the adaptor are mounted on stub shafts 50 extending between transverse plates 51 attached to the trough 41. Each wheel 42 is formed to provide a track wheel, and a wheel to rest on the ground to replace the dolly wheels which are within the trough. Each wheel 42 thus consists of a flanged wheel in which the ordinary narrow flange is replaced by a wide flange 52 which may serve the purpose of a dolly wheel.

Even in cases in which the gauge of the track 16 is considerably less than the distance between the legs of the landing gear, lateral twisting strains on the legs are avoided by the rigidity of the hen n 41. resulting from its trough-like form.

The beam 41 carries hold-down elements to prevent its wheels 42 from jumping from the track 16. The holddown elements may be projected inwardly below the plane of the bottoms of the smaller portions 53 of the wheels 42 so as to lie under the flanges 16 of the frame of the railway car and have a sliding engagement with them. The hold-down elements illustrated are hookshaped members 60 (Figs. 1, 5, 7) which are pivoted on fixed shafts 61 extending across a long shallow box 62 secured to the bottom of the trough 41. The shafts 61 extend between the side walls of the box in openings provided in the bottom of the box in alignment with the wheels 42.

Actuating means for the hold-down elements 60 provide for moving them between their operative position shown in Figs. and 6 and inoperative position in which they are turned up so as to be clear of the rail 16, and for locking them in each position. The actuating means includes arms 63 attached to the pivoted hold-down elements 60 and connected by rods or wires 64 to the arms 65 of discs 66 pivoted on vertical studs 67 near the ends of the box 62. The rotary motion of each disc 66 is limited by engagement of stop bolts 68 with the ends of arcuate slots 69 in the disc. A tension spring 70 in the box 62 is attached to each disc 66 in the manner shown in Fig. so that its inner end swings across the center or the disc when the disc is turned between its two extreme positions. The spring serves to lock the disc in either of its extreme positions. Each disc is provided with a handle 71 projecting through the side of the box 62. This makes it possible to actuate the hold-down elements from either side of the railway unit.

In the use of the adaptor which has been described, it may be retained on the landing gear both when the truck is used on the road and when it is transported on a railwa car. In road use, the usual contraction of the legs 35 of the landing gear raises the adaptor well clear of the ground so that it does pot interfere with road operation. When the trailer is to be disconnected from its tractor, the legs 35 may be extended in the usual way so as to bring the enlarged portions 52 of the wheels 42 into contact with the ground where they serve the purpose of the ordinary dolly wheels.

When the trailer is to be transported by rail, it is placed on the track on the frame of a railway car, for example, by means of a tractor as described in the aforesaid application Serial No. 464,535, and the legs 35 of the running gear are then extended sufiiciently to bring the smaller portions 53 of the wheels 42 into engagement with the flanges 16 of the frame of the railway car. One or the other of the handles 71 is operated to project the holddown elements 60 under the flanges 16 so that the wheels are prevented from jumping from the flanges 16, while they are at the same time free to move lengthwise on these flanges to relieve the landing gear of the force of longitudinal stresses between the trailer and the railway car.

The modified adaptor shown in Figs. ll to 15 consists essentially of an open-bottom beam which permits the dolly wheels of the landing gear to project below it when it is applied to the legs of the landing gear. The beam is provided with small wheels or rollers to run upon tracks, and it is unnecessary to make these rollers in a form which can replace the dolly wheels since the projection of the dolly wheels through the open bottom of the beam permits the use of these wheels for their usual purpose.

The specific adaptor illustrated in Figs. ll to 15 is intended for application to the landing gear of trailers in which the legs of the landing gear are separated by a standard distance. The adaptor 89 consists essentially of a light rigid fabricated beam 81 made up of upper and lower rectangular frames 82, 33 secured together by inclined side pieces 84 and stiffened by transverse members S5. The parts of the beam 81 most desirably consist of hollow tubing as shown in order to make the beam as light as possible. The rectangular upper and lower members 82, 83 each have a width slightly greater than the diameter of the usual dolly wheels of a trailer and the end portions of the lower member 33 are open so that the dolly wheels may project downwardly through them.

On-the lower rectangular member of the beam 83 are mounted two pairs of small wheels or rollers 86 of the same gauge as the track 16 on the railway car on which they are to run. In order to guide the wheels 86 on the track, they may be provided with ordinary wheel flanges at their outer ends. A less expensive means for guiding the wheels on the tracks is a short guard 88 projecting downwardly from one of the tubes of the lower rectangular member 83 at the outer end of each roller 86 and of suflicient length to engage the edge of the track 16 when the roller 86 rests on the track, as shown in Fig. 15.

To provide for mounting the beam 81 across the lower ends of the legs of the landing gear of a truck, curved cross-pieces 89 extend between the sides of the lower rectangular frame near each end thereof. These crosspieces are separated by the same distance as the legs 35 of the landing gear so that each of them may engage the bottom of one of the legs, as best shown in Fig. 14. To hold these cross-pieces against the ends of the legs, two U-shaped members 90 are provided to engage the upper surfaces of the T-shaped bearing members 38 at the lower ends of the legs 35 between the dolly wheels 36 (see Fig. 3). The arms of the U-shaped member 90 are inserted through holes 91 in vertical plates 92 extending between the side members of the upper and lower rectangular frames near the ends thereof. When inserted through these holes, the arms of the member 90 overlie the bearing members 38 of the legs 35, as shown in Fig. 14. Each U-shaped member is held in position by a catch 93.

When the beam 80 is mounted on the ends of the legs 35 by means of the cross-pieces 89 and the U-shaped members 90, the lower edge of the frame lies above the lower surfaces of the dolly wheels 36 of the landing gear, as shown in Fig. 14, so that the beam does not interfere with use of the dolly wheels for their intended purpose of supporting the trailer on the ground when it is detached from a tractor.

When the trailer is to be transported by rail, the four rollers 86 on the beam rest on track 16 provided at the outer edges of the frame of a railway car, and the outer edges of the track are engaged by the depending guards 88 to guide the rollers on the tracks.

Although the rollers 86 are some distance from the legs 35 of the running gear, the rigidity of the frame is such that no lateral twisting strains are brought on the legs 35.

What I claim is:

1. An adaptor for the landing gears of semi-trailer trucks to enable them to be used in a rail-and-road transportation system, comprising a rigid beam, means located adjacent each end of said beam for attaching the beam to a trailer landing gear so that it extends between the lower ends of the legs of the landing gear, wheels pivoted on said beam and positioned to run on a track of a gauge different from the separation of the legs of the landing gear, and means for guiding the wheels adapted to engage an edge of such a track.

2. An adaptor as claimed in claim 1, having two pairs of track Wheels placed at equal distances from the axis of the beam so that they bring no twisting strains on the legs of the landing gear to which the beam is attached.

3. An adaptor for the landing gears of semi-trailer trucks to enable them to be used in a rail-and-road transportation system, comprising a rigid beam, attachment means near the ends of the beam for embracing and clamping parts of the landing gear located at the lower ends of its legs so that the beam extends between the lower ends of the legs of the landing gear, wheels pivoted on said beam and positioned to run on a track of a gauge different from the separation of the legs of the landing gear, and means for guiding the wheels adapted to engage an edge of such a track.

4. An adaptor as claimed in claim 3, in which the beam has the form of a trough with a semi-circular bottom, and the attachment means comprises detachable cross-members adapted to clamp two of the dolly wheels of the landing gear in said trough in any longitudinal position.

5. An adaptor as claimed in claim 3, in which the beam has the form of a trough with a semi-circular bottom and extending lateral flanges, the attachment means comprises detachable cross-members engaging said flanges to clamp two of the dolly wheels of the landing gear in said trough in any longitudinal position, and the wheels are mounted on stub shafts extending between pairs of transverse plates secured externally on the trough.

6. An adaptor as claimed in claim 3, in which the beam has the form of a trough with a semi-circular bottom, the attachment comprises members adapted to clamp two of the dolly wheels of the landing gear in said trough in any longitudinal position, and each wheel has a cylindrical part for engaging a track and a flange for engaging the edge of the track and of sufficient width to serve to replace the dolly wheels which are confined in the trough.

7. An adaptor as claimed in claim 1, in which the beam is open at the bottom so that the dolly wheels of the landing gear may project downwardly below the bottom of the beam, and the track wheels are mounted on the beam between the dolly wheels and above their lower edges.

8. An adaptor as claimed in claim 1, in which the beam has an open bottom permitting the dolly wheels to project below the bottom of the beam, the track wheels are mounted at the lower edge of the beam, and the means for guiding the wheels consists of guards projecting downwardly from the lower edge of the beam at the outer ends of the Wheels to engage the outer edges of the track.

9. An adaptor as claimed in claim 3, in which the beam has an open bottom permitting downward projection of the dolly wheels, the track wheels are mounted on the lower edge of the beam, and the attachment means comprises transverse members extending across the open bottom of the beam and positioned to engage the lower ends of the legs of the landing gear and laterally removable means for engaging the upper sides of the T-shaped hearing pieces at the lower ends of the legs of the landing gear.

10. An adaptor as claimedvin claim 1, in which the beam consists of a framework including upper and lower rectangular frames, and the track wheels are mounted on the lower rectangular frame of the beam.

11. An adaptor as claimed in claim 1, in which the beam is constructed of a framework including upper and lower rectangular frames, the wheels are mounted on the lower rectangular frame of the beam, and the means for guiding the wheels consists of guards projecting downward from the lower rectangular frame at the outer ends of the wheels to engage the outer edge of the track.

12. An adaptor as claimed in claim 3, in which the beam is constructed of a framework of tubular members including upper and lower rectangular frames, the wheels are mounted on the lower rectangular frame of the beam, and the attachment means comprises transverse members across the lower rectangular frame positioned to engage the lower ends of the legs of the landing gear, and laterally removable members for engaging the upper sides of the T-shaped bearing pieces at the lower ends of the legs of the landing gear.

13. An adaptor as claimed in claim 1, in which holddown elements for the track wheels are mounted on the beam for movement between a position in which they are outside the outer ends of the track wheels and a position in which they extend inwardly below the lower surfaces of the track wheels to engage the lower side of a track on which the wheels are supported.

14. An adaptor as claimed in claim 1, in which holddown elements for the wheels are mounted on the beam for movement between a position in which they are outside the outer ends of the wheels and a position in which they extend inwardly below the lower surfaces of the wheels to engage the lower side of the track on which the wheels are supported, actuating mechanism for the hold-down elements extends longitudinally along the beam, and handles for operating the actuating mechanism are mounted on the beam near opposite ends thereof, so that the actuating mechanism may be operated from either side of the semi-trailer truck.

References Cited in the file of this patent UNITED STATES PATENTS 1,206,994 Craigmile Dec. 5, 1916 1,897,277 Reinhart et a1 Feb. 14, 1933 1,994,815 Ferrin Mar. 19, 1935 2,062,801 Talon Dec. 1, 1936 2,121,181 Bayerl June 21, 1938 2,357,633 Cowgill Sept. 5, 1944 2,491,034 Couch Dec. 13, 1949

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1206994 *Aug 14, 1916Dec 5, 1916Charles I CraigmileEmergency-carriage for broken railway-trucks.
US1897277 *Dec 21, 1931Feb 14, 1933James WadsworthVehicle
US1994815 *Jul 18, 1932Mar 19, 1935Frank FerrinRailroad and land vehicle trailer truck and transfer system
US2062801 *Mar 25, 1933Dec 1, 1936Dunlop SaRemovable guiding device for automobile vehicles running on rails
US2121181 *May 23, 1933Jun 21, 1938Bayerl Karl JSystem for transporting freight
US2357633 *Oct 6, 1943Sep 5, 1944Jr Harry B CowgillSpotting dolly for airplanes and the like
US2491034 *Feb 12, 1946Dec 13, 1949Couch Seth TDriving wheel carrier
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2991732 *Nov 30, 1959Jul 11, 1961Gen Am TransportCombination road and railway vehicles
US3016025 *Jun 12, 1959Jan 9, 1962Gen Am TransportFreight transportation systems and methods
US3046910 *Sep 4, 1956Jul 31, 1962Trailmobile IncLanding gear clamping device
US3158106 *May 18, 1959Nov 24, 1964Gen Am TransportFreight transportation systems
US3163127 *Jun 15, 1960Dec 29, 1964Pullman IncCushion container support platform for railroad flatcars
US4718800 *Apr 18, 1986Jan 12, 1988General Signal CorporationStanchion
US5112172 *Sep 12, 1990May 12, 1992Knorr Brake Holding CorporationSliding pull up stanchion and method
US5452982 *Jan 7, 1994Sep 26, 1995Knorr Brake Holding Corp.System for positioning and supporting trailers on railcars
US5501566 *Apr 21, 1995Mar 26, 1996Engle; Thomas H.System for positioning and supporting trailers on railcars
Classifications
U.S. Classification410/57, 105/215.2, 410/67
International ClassificationB60P3/073, B60F1/00, B60S9/16, B61D45/00, B60D1/66, B60S9/00, B61D3/18, B60P3/06, B60F1/02, B60D1/00, B61D3/00
Cooperative ClassificationB60F1/02, B60S9/16, B60P3/073, B60D1/66, B61D45/005, B61D3/188
European ClassificationB60P3/073, B60F1/02, B60D1/66, B60S9/16, B61D45/00B3B, B61D3/18C2