Fifth wheel carrier hoist

A hoist frame comprises a planar member having front and rear opposite ends and top and bottom planar surfaces and a pair of extending members comprising a pair of spaced parallel members extending from the bottom surface at the rear end of the planar member perpendicular to the bottom surface. Mounting means pivotally mounts the planar member of the hoist frame to the chassis frame at the bottom surface at the front end of the planar member in a manner whereby the extending members extend beyond and to an area beneath the chassis frame. A jack is affixed to the planar member of the hoist frame at the bottom surface at the rear end thereof equidistantly from the extending members and extending perpendicularly from the bottom surface for pivotally moving the hoist frame about the mounting means thereof. A pair of boom securing means extend perpendicularly from the top surface of the planar member in the areas of the front and rear end of the planar member for selectively releasably securing a variable length boom at one of the boom securing means or both of the boom securing means.

DESCRIPTION OF THE INVENTION 
The present invention relates to a fifth wheel carrier hoist. More 
particularly, the invention relates to a fifth wheel carrier hoist for a 
towing vehicle for towing heavy vehicles. 
Objects of the invention are to provide a fifth wheel carrier hoist of 
simple structure, which is of very few parts and simple structure, but 
which has considerable structural strength, and functions efficiently, 
effectively and reliably to hoist or tow a very heavy vehicle with an 
advantageous distribution of the weight of the towed vehicle.

The fifth wheel carrier hoist of the invention is for a towing vehicle 1 
(FIGS. 1 to 3 and 5 to 7) for towing heavy vehicles such as, for example, 
a heavy tractor or similar vehicle 2 (FIGS. 2, 3, 6 and 7). The towing 
vehicle 1 has a chassis frame 3 (FIGS. 1 to 3 and 5 to 7). 
The fifth wheel carrier hoist of the invention comprises a substantially 
planar member 4 having front and rear opposite ends 5 and 6, respectively, 
and top and bottom substantially planar surfaces 7 and 8 (FIGS. 2, 4 ad 
7). The planar member 4 has a pair of extending members comprising a pair 
of spaced substantially parallel members 9 and 10 (FIG. 4) extending from 
the bottom surface 8 at the rear end 6 of the planar member 4 
substantially perpendicular to said bottom surface. 
A mounting device 11 pivotally mounts the planar member 4 of the hoist 
frame to the chassis frame 3 at the bottom surface 8 at the front end 5 of 
said planar member in a manner whereby the extending members 9 and 10 
extend beyond, and to an area beneath, said chassis frame. 
A jack 12 (FIGS. 1, 3, 4 and 7) is affixed to the planar member 4 of the 
hoist frame at the bottom surface 8 at the rear end 6 thereof 
substantially equidistantly from the extending members 9 and 10. The jack 
12, which may comprise any suitable, heavy duty jack, extends 
substantially perpendicularly from the bottom surface 8 for pivotally 
moving the hoist frame about the mounting device 11 thereof. 
A pair of boom securing devices 13 and 14 extend substantially 
perpendicular from the top surface 7 of the planar member 4 in the areas 
of the front and rear ends 5 and 6, respectively, of said planar member. 
The boom securing devices 13 and 14 selectively releasably secure a 
variable length boom 15 at the boom securing devices 13 and 14. 
Each of the pair of boom securing devices 13 and 14 comprises a pair of 
spaced substantially parallel plates straddling the boom 15 and having 
holes formed therethrough, and pins adapted to be removably inserted via 
holes of the pair of spaced plates thereby restraining the boom between 
said plates. Thus, as shown in FIG. 4, for example, the boom securing 
device 13 comprises a pair of substantially parallel plates 16 and 17 
straddling the boom 15 and having holes 18 and 19 formed through the plate 
17. The corresponding holes, formed through the plate 16, are not seen in 
the FIGS. A pin 20 is adapted to be removably inserted in the hole 18 of 
the plate 17 and in the corresponding hole of the plate 16 thereby 
restraining the boom 15 between the plates 16 and 17. The boom securing 
device 14 comprises a pair of spaced substantially parallel plates 21 and 
22 straddling the boom 15 and having a hole 23 formed through the plate 22 
and a corresponding hole (not shown in the FIGS.) formed through the plate 
21. A pin 24 is adapted to be removably inserted in the hole 23 of the 
plate 22 and the corresponding hole 21 thereby straddling the boom 15 
between said plates. 
Each of the extending members 9 and 10 has holes 25 and 26, and 27 and 28, 
respectively (FIG. 4), formed therethrough for accommodating pins such as, 
for example, a pin 29, adapted to be removably inserted in selected one of 
such holes thereby supporting the boom 15 via the extending members, as 
shown in FIGS. 6 and 7. In such case, the pin 29 is removably inserted in 
the holes 26 and 28 and a pin 30, is removably insered in the holes 25 and 
27. 
When the vehicle 1 is to tow the vehicle 2 in a backward manner, the 
vehicle 1 is backed up to the vehicle 2 and the hoist frame is pivotally 
moved until the jack and the extending members rest on the supporting 
surface of the vehicles. The boom 15 is extended and lowered with one end 
on the vehicle 2, so that it is then coupled at one end to the vehicle 1 
and at the other end to the vehicle 2, as shown in FIGS. 2 and 3. A chain 
or cable 31 is then extended between the boom securing device 14 of the 
vehicle 1 and the boom securing device 32 of the vehicle 2, as shown in 
FIGS. 2 and 3. The chain or cable 31 is extended under the rear axle of 
the vehicle 2. The jack 12 is then operated to raise the hoist frame to 
the desired height and pins are positioned in the boom securing device to 
secure the boom 15 in position. After the pins are positioned, the jack 12 
is withdrawn into its casing and the vehicles remain in the positions 
shown in FIG. 3. 
If the vehicle 1 is to tow the vehicle 2 in a forward manner, the boom 15 
is first supported at the lower parts of the extending members 9 and 10, 
by appropriate pins, as shown in FIGS. 6 and 7. The vehicle 1 is then 
backed up until a pair of twin booms 15 are positioned under the chassis 
of the vehicle 2. A chain 33 is then fastened around the twin booms 15 and 
the chassis of the vehicle 2, as shown in FIGS. 6 and 7. The jack 12 is 
then operated, so that it raises the boom 15 to a desired height above the 
supporting surface of the vehicles. When the desired height is reached, 
the jack is withdrawn into its housing, after additional pins are provided 
in the holes of the extending members to secure the twin booms thereon. 
Although a single boom 15 is discussed throughout the disclosure, a pair of 
identical twin booms 15 are readily useable in its stead, as described 
with reference to FIGS. 5, 6 and 7. 
A block 34 is carried on the chassis frame 3 of the vehicle 2 under the 
boom 15 to support said boom while travelling without a load, as shown in 
FIG. 1. 
While the invention has been described by means of a specific example and 
in a specific embodiment, I do not wish to be limited thereto, for obvious 
modifications will occur to those skilled in the art without departing 
from the spirit and scope of the invention.