Coupled draft key puller

Sometimes when attempting to remove the draft key from an E-type railway car coupler, it is difficult to connect the key pulling device to the key without disconnecting the trainline. A simple key pulling device which solves this problem includes a pair of parallel hydraulic cylinders, a yoke interconnecting one end of the cylinders, piston rods extending out of such one end of the cylinders, a socket in the yoke, and separate jaws for removable mounting in the socket and for connecting the pulling device to a key, whereby the jaws can be independently mounted on the head of a key and then connected to the yoke, extension of the piston rods against the coupler causing outward movement of the cylinders, yoke and jaws to pull the key from the coupler.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to a pulling device, and in particular to a pulling 
device for removing a coupler draft key from a so-called E-type railway 
car coupler. 
2. Discussion of the Prior Art 
U.S. Pat. No. 5,129,133, which issued to David W. Reesor on Jul. 14, 1992 
describes a simple draft key puller for removing a key of the type 
including a flanged head from a railway car coupler. The puller includes a 
pair of parallel hydraulic cylinders, a yoke interconnecting one end of 
the cylinders, piston rods extending out of the other end of the 
cylinders, a sleeve in the yoke parallel to the cylinders for receiving an 
elongated shaft, a latch for retaining the shaft in the sleeve, and a 
socket in the outer free end of the shaft for receiving the head of a key, 
whereby, with the shaft in the sleeve and connected to a key, extension of 
the piston rods against the coupler pocket pushes the cylinders and 
consequently the sleeve and shaft outwardly to pull the key from the 
coupler. 
While the above described device works well, a problem arises when the 
trainline (the air line running from the locomotive to the rear of the 
train) interferes with the placing of the socket in the outer free end of 
the shaft on the head of a key. In many instances, the trainline passes 
beneath the key in close proximity thereto, making it difficult if not 
impossible to place the socket on the head of the key without removing the 
trainline. 
While the patent literature includes a large number of patents relating to 
pulling devices having features in common with the invention described in 
the above-mentioned Reesor patent, none of the patents offers a solution 
to the problem outlined above. The literature in question includes U.S. 
Pat. No. 2,507,003, issued to A. Gagne on May 9, 1950; U.S. Pat. No. 
2,735,649, issued to S. A. Swallert on Feb. 21, 1956; U.S. Pat. No. 
2,797,889, issued to H. H. Talboys on Jul. 2, 1957; U.S. Pat. No. 
2,807,080, issued to G. R. Mathews, Sr. on Sep. 24, 1957; U.S. Pat. No. 
2,874,933, issued to J. E. Feucht on Feb. 24, 1959; U.S. Pat. No. 
3,066,913, issued to A. E. Leeson on Dec. 4, 1962; U.S. Pat. No. 
3,069,761, issued to F. Sommer on Dec. 25, 1962; U.S. Pat. No. 3,744,116, 
issued to B. E. Peterson on Jul. 10, 1973; U.S. Pat. No. 3,797,097, issued 
to B. E. Peterson on Mar. 19, 1974; U.S. Pat. No. 3,908,258, issued to T. 
Barty on Sep. 30, 1975 and U.S. Pat. No. 5,233,740, issued to J.-N. Chen 
on Aug. 10, 1993, and U.K. Patent No. 22,682, granted to Thomas Barnes on 
Jul. 4, 1907. In general, the patented devices include jaws or sockets for 
gripping an article to be pulled which are permanently affixed to the 
remainder of the devices. Moreover, many of the patented devices are 
structurally complicated, and thus expensive to mass produce. 
GENERAL DESCRIPTION OF THE INVENTION 
The object of the present invention is to provide a relatively simple 
coupler draft key puller, which can readily be connected to a key, even 
when an obstruction such as a trainline is present on one side of the key. 
Accordingly, the present invention relates to a device for removing a draft 
key including a shank and a head from a railway car coupler comprising a 
pair of fluid actuated cylinder means; yoke means interconnecting said 
cylinder means for maintaining the cylinder means in permanent parallel, 
spaced apart relationship; piston rod means extending outwardly from said 
cylinder means on one side of said yoke means;-socket means in said one 
side of said yoke means; and separable jaw means for removable mounting in 
said socket means, and for receiving the head of a key, whereby the jaw 
means can be independently mounted on the head of a key and then placed in 
said socket means to connect the jaw means to said yoke means, and the 
piston rod means extended against the coupler to cause outward movement of 
said cylinder means, yoke means and jaw means to pull the key from the 
coupler.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
It will be noted that the drawings illustrate two very similar embodiments 
of the invention. Accordingly, wherever possible, the same reference 
numerals have been used to identify the same or similar elements in the 
drawings. 
Referring to the drawings, the device of the present invention is intended 
for use in removing a key 1 from a railway car coupler (not shown). The 
key 1 includes a generally rectangular, elongated shank 2, with a hole 3 
in one end thereof for receiving a pin (not shown). A head 4 is provided 
on the other end of the shank 2, permitting grasping of the key 1 during 
insertion or removal of the key from the coupler. The head 4 is defined by 
a rectangular plate on the end of the shank 2. 
The key pulling device in accordance with this invention includes a pair of 
hydraulic cylinders 6, with piston rods 7 extending out of one end 8 
thereof. An internally threaded sleeve 9 is mounted on the externally 
threaded end 8 of each cylinder 6. A disc or saddle 11 is provided on the 
outer end of each piston rod 7 for defining a large bearing surface. A 
bolt 12 (FIG. 2) extends outwardly from one side of the saddle 11 into a 
threaded bore (not shown) in the outer end of the piston rod 7. Hydraulic 
fluid is fed to and discharged from the other end 14 of the cylinders 6 
from a source thereof (not shown) via a line 15 (FIG. 1), a coupler 16, a 
pipe cross 17, tube fittings 18, tubes 19 and elbows 20 (FIG. 2). In the 
embodiment of the invention illustrated in FIGS. 1 and 3, the tubes 19 are 
connected at one end directly to the pipe cross 17 and to the cylinders 6. 
It will be appreciated that FIGS. 1 and 3 are somewhat schematic, and that 
in most cases the hardware illustrated in FIG. 2 would be used. A handle 
22 interconnects the ends 14 of the cylinders 6. The handle 22 includes 
discs 23 mounted on the cylinder ends 14 by means of bolts 24, and a rod 
25 extending between the discs 23. 
The threaded ends 9 of the cylinders 6 extend through holes 26 in opposite 
ends of a yoke 28. The yoke 28 is defined by a polygonal body 29 of 
aircraft aluminum. The cylinders 6 are retained in the body 29 by set 
screws 30 and by the sleeves 9. The pipe cross 17 is attached to the rear 
end of the body 29 by a pipe nipple 31. A handle 32 is mounted on the yoke 
28. The handle 32 includes a base plate 33 (FIGS. 1 and 3) connected to 
the body by bolts 34, and a C-shaped bar 35. In the second embodiment of 
the invention (FIG. 2), the handle 32 is one-piece and generally C-shaped 
in cross section. 
A socket defined by a recess or mortise 36 is provided in the front end of 
the body 29. The mortise 36 is in the shape of a truncated triangle, i.e. 
includes outwardly converging sides 37 for forming a dovetail-like 
connection with between the yoke 28 and a pair of jaws 38. The mortise 36 
is covered by the handle 32. 
Each jaw 38 is defined by a pair of virtually identical, generally S-shaped 
plates. The front arm 41 of the plates are interconnected at their centers 
by a web 42, which together with the plates defines a groove for receiving 
the shank 2 of the key 1. The arms 41 are generally L-shaped, defining 
hooks for engaging the head 4 of a key 1. The L-shaped rear arms of the 
plate include complementary generally triangular ends 44, which together 
form a wedge or tenon of the same shape as the mortise 36. Blocks 45 
extending between the rear ends of the plates of one jaw 38 project 
outwardly for sliding between the plates of the other jaw. The block 45 of 
one jaw 38 is not aligned with the block of the other jaw, so that the 
jaws can slide completely together (FIG. 3). A reinforcing plate 47 
extends between the rear ends of the arms 41 of each jaw. 
Before being used, the jaws 38 are separate from the yoke 28 and from each 
other. The jaws 38 are separately placed on the head of the key 1, i.e. 
slide laterally onto the key 1 so that the jaws 38 engage the head 4 and 
the rear ends 44 of the jaw plates abut each other. The yoke 28 is then 
slid downwardly onto the jaws 38, so that the jaws are, in effect, wedged 
in the yoke 28. The handle 32 limits downward movement of the yoke 28 onto 
the jaws 38. Hydraulic fluid is introduced into the cylinders 6. Thus, the 
piston rods 7 are extended so that the saddles 11 press against the 
coupler (not shown) on each side of the key 1. As the piston rods 7 
continue to be extended, the cylinders 6 move away from the coupler with 
the yoke 28 and the jaws 38. This action results in pulling of the key 1 
from the coupler. 
It will be appreciated that the key pulling operation is simple, being 
generally the same as described in the David W. Reesor earlier U.S. Pat. 
No. 5,129,133. The use of jaws which are initially separate from the yoke 
makes it relatively easy to mount the jaws on a key. The simple dovetail 
connection between the yoke and jaw, facilitates connecting and 
disconnecting of the various elements of the device.