Heretofore, it has been the practice to use a separate and attachable towing apparatus to enable a towing vehicle such as a trailer cab when not towingly engaging a trailer to engage and transport an alternate vehicle such as another trailer cab, usually when the second trailer cab has become either inoperative or dam- ^' aged. It has been a common practice for the trailer cab to tow a loaded trailer to a given destination, disengage the trailer and engage a trailer cab so as to transport the same back on the return trip. This type of utilization of the original trailer cab was found to be most efficient since a second towing vehicle was not required to be sent on a round-trip solely to engage and tow a disabled trailer cab back to the service

facuities or headquarters of a trucking company.

Typically, when the trailer cab transported a trailer to a predetermined destination and the trailer was disengaged, the driver or other parties would assemb and attach a separate towing apparatus to the trailer cab so as to adapt it to transport a disabled trailer cab on the return trip. Such non-integral towing apparatus as has been known he etofore at its destinatio site typically required several hours or more of valua- ble driver and trailer cab time for assembly and securin to the trailer cab chassis, which could otherwise have been more profitably utilized.

Su mary of ^■ Invention The integral towing apparatus of this inven¬ tion is of simple and inexpensive construction so that it does not interfere with the functioning of the trailer cab during normal operation, and it is safer in use than towing apparatus known heretofore since it is not hurriedly, assembled and secured to the trailer cab sub¬ sequent to removing a trailer at the destination site. The integral towing apparatus is adapted to be carried at all times by the trailer cab and further adapted so -that in the stowed position it will accommodate normal operation of the fifth wheel coupler of the trailer cab and in the towing position it will accommodate towing of an alternate type vehicle such as a second trailer cab. It is therefore an object of the invention to provide a simple and reliable towing apparatus.

It i_ also an object of the invention to pro¬ vide an apparatus integral with a towing vehicle which accommodates normal operation of the towing vehicle when in the stowed position and functions to tow an alternate vehicle when in the towing position.

It is another object of the invention to pro- vide a simple and reliable towing apparatus which can be used as an integral part of a trailer cab and accommodate normal operation of the trailer cab when in the stowed position but allow the trailer cab to tow another trailer cab when in the towing position.

It is yet another object of the invention to provide a towing apparatus which when used in combination with a trailer cab will allow the trailer cab to quickly

and safely towingly engage another trailer cab.

It is a further object of the invention to provide a towing apparatus which will result in signi¬ ficant savings in time required for a first trailer cab to towingly engage a second trailer cab.

It is a still further object of the invention to provide an integral towing apparatus for a first trailer cab which can be expeditiously operated by the driver to towingly engage a second trailer cab.

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Brief Description of- Drawings Some of the objects and advantages of the inven¬ tion having been stated, others will appear when taken in connection with the accompanying drawings, in which: Figure 1 is a side elevational view of a towing vehicle with the integral towing apparatus in towing engagement with a second towing vehicle;

^• Figure 2 is a side elevational view of a towing vehicle with the integral towing tional towing engagement with a trailer;

Figure 3 is a vertical sectional view of the invention;

Figure 4 is a transverse sectional view taken along lines 4-4 of Figure 3; Figure 5 is a transverse sectional view taken along lines 5-5 of Figure 3;

Figure 6 is a lifting end elevational view of the invention;

Figure 7 is a perspective view of the invention in its towing position;

Figure 8 is a perspective view of the invention in its stowed position; and

Figure 9 is a transverse sectional view taken along line 9-9 of Figure 8.

Detaiied Description o Invention The towing apparatus of this invention com¬ prises a boom means mounted on the chassis of a towing vehicle for movement from a stowed position to a towing position. The boom means when in the stowed position accommodates normal operation of the conventional fifth wheel coupling device of the towing vehicle and the boom means when in the towing position accommodates tow¬ ing engagement of the towing vehicle with an alternate vehicle such as a disabled towing vehicle. Also pro¬ vided by the towing apparatus of this invention are means for securing the boom means in the towing position.

Referring now more specifically to the drawings Figures 1 and 2 show the towing apparatus in combination with a towing vehicle and Figures 3 through 9 show a pre¬ ferred embodiment of the towing apparatus according to the present invention.

In Figures 1 and 2, reference numeral 10 broadl indicates .a towing vehicle such as a trailer cab, and wherein the integral towing apparatus of this invention, broadly indicated by reference numeral 11, is mounted to the chassis of the towing vehicle 10.

In Figure 1, the towing vehicle 10 with the - integral towing apparatus 11 mounted thereon is shown in towing engagement with a second towing vehicle or trailer cab, broadly indicated by reference numeral 12. Figure 2 illustrates the towing vehicle 10 with the integral towing apparatus 11 of the invention mounted thereon in its stowed position so as to allow the towing vehicle to towingly engage a trailer, broadly indicated by reference numeral 14. Thus, Figure 1 illustrates the

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integral towing apparatus 11 in its raised and extended towing position and Figure 2 illustrates the towing apparatus 11 in its lowered and withdrawn stowed position so as to accommodate normal operation of the towing vehicle 10 in towing the trailer 14. The conventional coupler means, for the towing vehicle is indicated by reference numeral 15 and comprises a fifth wheel type coupling device.

Referring now more specifically to the con¬ struction of the towing apparatus 11 as illustrated in Figures 3 through 9, it will be noted that the towing apparatus comprises a boom means, a means for securing the boom means in the towing position, a means for rais¬ ing the boom means from the stowed position (Figure 8) to the towing position (Figure 7) , and locking means for securing the boom means in either a withdrawn position or an extended position.

The boom means, generally indicated at 16, is a telescopic construction' and comprises a first tele¬ scopic member 22 and a second telescopic member 24 where- in the first telescopic member 22 is pivotally mounted on a pivot member 25 extending transversely of the towing vehicle chassis and the second telescopic member 24 is slidably received by the first member and extensible therefrom. Therefore, it can be seen that the tele- scopic boom means 16 is pivotally mounted for movement from lowered and withdrawn positions while in the stowed position to raised and extended positions while in the towing position. The elements of the boom means are fixed together in an appropriate manner to transmit the force necessary to' tow the towed vehicle.

The means for securing the telescopic boom means 16 in the towing position comprises a brace member 18 pivotally .mounted on the chassis of the towing vehicle 10 and adapted for positioning in supporting engagement with the telescopic boom means. 16 when the boom means is in the raised towing position. There is a weight distri¬ buting bar on one side of the brace member 18 to facili¬ tate distributing the towing force on the brace member to the chassis of the towing vehicle 10. The means for rais ing the telescopic boom means 16 from the stowed position to the towing position preferably is a fluid pressure actuated device, such as an air suspension bag 19, which is positioned between the telescopic boom means 16 and the chassis of the towing vehicle 10 so as to raise the telescopic boom means 16 into the towing position when actuated. An air line 20 communicates with the air suspension bag 19 to provide a conduit for air pressure to activate the air bag. While the drawing shows a singl air bag 19, it is contemplated that one or more fluid pressure or mechanically actuated devices of whatever type desired may be used.

Referring now specifically to Figure 4, the locking means, generally indicated at 21, fixedly - secures the first and second telescopic members 22 and 24, respectively, at different times in withdrawn and extended relative positions. Preferably, the locking means 21 comprises a rod member 26 which is urged into an aperture 28a in telescopic member 22 and further urged into either one of two apertures 28b and 28c positioned along the longitudinal length of the second telescopic -member 24 which is slidably received by the first telescopic member 22. If apertures 28a and 28b

are aligned, the telescopic boom means 16 can be locked in the extended position by extending rod member 26 , therethrough. Whereas, to lock the telescopic boom means in the withdrawn position, the rod member 26 must be slidably received by aligned apertures 28a and 28c. The rod member 26 of the locking means 21 has a handle 29 on the end thereof remote from the telescopic member 22. so as to facilitate pulling the rod member from engagement with one of the apertures 28b or 28c of second telescopic member 24 and allowing for sliding of the second telescopic member 24 until the other aperture therein is aligned with the single aperture 28a in the first telescopic member 22. At this relative position, the rod member 26 is slidingly received by both aligned apertures and locks the telescopic boom means 16 into the second of the two positions, extended or with¬ drawn.

As best shown in Figures 5 and 6, the telescopic boom means 16 has an accessory lifting member 30 mounted transversely of the second telescopic member 24 of the boom means 16 for accommodating the attachment of lift¬ ing chains to facilitate the lifting and towing of a second towing vehicle such as a trailer cab. The acces- sory lifting member 30 is connected to the second tele- scopic member 24 by means of a universal swivel connec¬ tion 31 that permits the accessory lifting member to rotate and pivot about multiple axes in accommodation of the motions necessary between a towed and towing vehicle. The accessory lifting member 30 provides stability and means for securing a plurality of chains in a lateral fashion to a disabled towing vehicle or

trailer cab 12 to be partly lifted from contact with the road surface and towed by the towing vehicle 10.

Typically, the towing vehicle 10 on one leg of a round trip would transport a trailer 12 connected by means of the conventional fifth wheel coupler 15 associated with the towing vehicle 10. The towing ap¬ paratus 11 of this invention would be in its stowed position so as to accommodate normal operation of the fifth wheel coupling device 15. Before beginning another leg of a trip, the towing vehicle 10 would dis¬ engage the trailer 14 and subsequently towingly engage, for example, a disabled trailer cab 12. Alternatively, a towing vehicle 10 in combination with the integral tow¬ ing apparatus could be utilized solely to travel to the location of an inoperative or disabled second towing vehicle 12 and towingly engage the latter with the integral towing apparatus 11 of this invention and trans¬ port the inoperative towing vehicle 12 to a servicing site. The integral towing apparatus 11 as arranged in its towing position can best be seen in Fugure 7. The telescopic boom means 16 has been raised to its towing position by the air bag 19, and the second telescopic member 24 has been pulled longitudinally outwardly into an extended position from the first telescopic member 22. The locking means 21 secures the telescopic boom means 16 in the extended position as rod member 26 has been slidingly received within the aligned apertures 28a and 28b situated within the most proximate walls of the first and second telescopic members, 22 and 24 respective ly. The brace member 18 has been pivoted from its

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downwardly extending position (phantom lines in Figure 3) into supporting engagement with the telescopic boom means 16. In this supportive position, the brace member 18 at least in part supports the telescopic boom means 16 and the load borne thereby in the towing position ^* , relieving the air bag 19 from the necessity of being pressurized so as to contribute to longer life for the air bag and avoid any catastrophic failure or blowout. The telescopic boom means 16 may also be supported in part by the air bag 19 positioned between the chassis of the towing vehicle 10 and the telescopic boom means 16, should that be appropriate or desired.

The first telescopic member 22 of the tele¬ scopic boom means 16 is pivotally mounted on pivot member 25 which extends transversely of the chassis of the towing vehicle 10. Also to be noted regarding the towing apparatus 11 is the accessory lifting member 30 mounted transversely of the second telescopic member 24 for accommodating the attachment of lifting chains to faci- litate towing of the alternate vehicle or trailer cab 12. ^' The lifting chains can be wrapped around the accessory lifting member 30 or fastened to the engaging hooks 32 affixed on both ends of the accessory lifting member 30. Normally, when the integral towing apparatus

11 of this invention is in the towing position illustrat¬ ed in Figure 7 and Figure 1, the disabled towing vehicle 12 will be towingly engaged in such a manner that it will be transported with its rear chassis and wheels lifted upwardly and out of contact with the adjacent road surface and the chassis adjacent the rear chassis of the towing vehicle 10. This, of course, is to

facilitate the lifting and towing of the disabled towing vehicle 12 since most of its weight is distributed toward the front thereof.

Figure 8 best illustrates the towing apparatus 11 of this invention in its stowed position on the towing vehicle 10 so as to accommodate normal operation of its conventional fifth wheel coupling device 15 in towing trailer 14. The telescopic boom means 16 has been lower¬ ed and withdrawn, and the brace member 18 has been pivot- ed downwardly so as not to be in supporting engagement with the telescopic boom means 16. The locking means 21 has secured the second telescopic member 24 within the first telescopic member 22 with the rod member 26 having been slidably received by the aligned apertures 28a and 28c.

Best illustrated in Figure 9 are the structure and support for the pivot member 25 which extends trans¬ versely of the chassis of the towing vehicle, the chassis designated by reference numeral 34 in Figure 9, and is secured to the chassis at either end of the pivot member 25. The first telescopic member 22 can be observed as supported on the pivot member 25 and pivoted thereon so as to allow for movement of the telescopic boom means 16 from the lowered position while in the stowed position to the raised position while in the towing position.

In operation, the operator would first position trailer cab 10 adjacent the rear of a second trailer cab 12. After disengaging the locking means 21, the second telescopic member 24 would be pulled longitudinally outwardly from within the first telescopic member 22 and tow chains would be wrapped around the rear chassis of disabled trailer cab 12 and secured to the engaging

hooks 32 affixed to each end of the accessory lifting member 30. Next, the operator would activate an air source to supply air pressure through the air line 20 to the air bag 19 so as to elevate the laterally extended telescopic boom means 16 and the ear chassis of trailer cab 12 secured thereto. To secure telescopic boom means 16 in the raised and extended position, support member 18 would be pivoted into supporting engagement with the boom means. The driver of trailer cab 10 could then proceed to safely tow the trailer cab 12 to a desired destination for servicing or repair.

It will thus be seen that there is provided, as described hereinbefore, a simple and reliable towing apparatus which can be used in combination with a towing vehicle so as to effect a towing of a second towing vehicle as may be required. More specifically, an inte¬ gral towing apparatus is provided for use by a conven¬ tional trailer cab with a conventional fifth wheel coupler to expeditiously engage a disabled second trailer cab- and transport the same to a remote location for servic¬ ing.

In the drawings and specification, there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used i a generic and descriptive sense only and not for purposes of limitation.