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Патент USA US2122073

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Ju?e 28, 1938.
2,122,073
F. SCHAEFER
SELF LOCKING KEY
Filed April 9, 193'/
-Fla. 1.
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Patented >June 28,1 1938
- 2,122,073
` UNITEDl STATES
PATENT OFFICE
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Frederic schuur, rumana, n.
Application Avril s, 1937, serial N0. 135,949v
s claim. (ci. ss-asi
This invention relates to self-locking keys, andv member in which it is inserted, a nail-like spread
more particularly to keys comprising a cotter
ing member- or wedge 'I is slidably disposed in
pin provided with a wedge for spreading the free openingß in the head and in the‘grooves formed
ends of the pin after the pin is driven into posi
by the channel-like pin legs. When the wedge
tion.
‘
is in its inoperative position its head 8 is spaced 5
This self-locking key is similar to the one ' .from the Cotter-pin head and its tapered end is
shown in my allowed patent application Serial
No. 22,740 for Cotter-pin. 'I‘he key there shown
comprises a cotter-pin having legs connected at
disposed behind end walls 6 of legs I. 'I'he di
verging pin legs can thus be pinched together
wlthoutinterference from the wedge suillciently
one end by a head provided with an' opening in to permit the key to be inserted in the desired l0
line with the legs. A spreading member is slid
opening. To retain the wedge in the pin at all
ably disposed in this‘opening and between the ltimes the portion of it within the pin is provided
legs and is adapted to spreadapart the free ends with detents 9 adapted to engage the ~inner sur
of the legs when it is driven inwardly of the head. face ot the head at the sides of opening 3 to
15 'I'he spreading-member is provided with a later
limit outward movement of the wedge relative l5
al projection that limits its outward movement thereto.
` relative to the pin, but- there are no meanstorl
lIt is a feature of this invention that the cotter
positively locking the spreading member inr its pin and wedge are so formed that the wedge
legs-spreading position.
.
‘
A
is positively locked in its legs-spreading position
ao It is amongÍ the objects of this invention to so that it can not accidentally‘work backwardly 20
provide a self-locking .key oi' the type :lust re
and allow- the legs todraw together whereby the
ferredto in which there are means for locking key might fall or work out of the opening in
the spreading member in legs-spreading posi
which it is disposed. ' Accordingly, the wedge and
tion. ‘ 'I'his object is preferably accomplished by pin are provided `with detents which inter-en
25 providing the cutter-pin legs and the spreading
gage when the wedge is driven into operative 25
member with. detents which are brought into in
position, and which can be disengaged only by
ter-engaging relation when the spreading mein
pounding on the tapered end of the wedge to
i ber is driveninto legs-spreading position.
drive it backwardly in thecotter-pin. Prefer
‘I'he preferred embodiment of the invention ably, a detent II is formed on the inner surface
30 _is illustrated in the 'accompanying drawing in of one ilange 4 o! each leg I, the two‘ detents 30
which Fig. 1 is Aan edge view of my self-locking being on opposite sides of the wedge whereby
key partly broken away; Fig. 2 isa side view they are diagonally opposite’each other as shown
thereof; Fig. 3 is aniedge view of the key with the in Figs. l and 6. The wedge is likewise provided>
_ legs-spreading member driven part way into the
35 cotter-pin; Fig. 4 is an edge view, partly broken
away, showing the spreading member in opera.
tive position; Fig. 5 is a side view of the key
with a pair oi' detents I2 formed on opposite sides
of the wedge diagonally opposite to each other 85 >
in position to engage detents II on the pin. All
of the detents in the wedge may be formed after
locked in a supporting member; and Figs. 6, 'I the wedge and pin are assembled by upsetting
and 8 are enlarged cross-sections loi’ the key the desired areas of the wedge with a tool oper
40 taken
on the lines VI-VL VII-VII and
VIII-VIII, respectively, of Figs. 2, 3 and 5. ,
ating on the wedge through the space formed 40
Referringto Figs. 1 and 2 of the drawing, there
is shown a Cotter-pin having resilient legs I in
As shown in Figs. 6 and 7, the distance between
each leg detent II and opposite ilange 4, is great
enough to permit the adjacent wedge detent I2
to pass the leg detent. However, as the leg de- 45
tents are disposed on‘opposite sides of the wedge
they normally engage the opposite sides of the
wedge> and maintain it centered in the channel
like legs, as shown in Fig. 6, so that the wedge
tegrally connected at one end by a head 2 in' the
45 form of a loop provided with an opening l vin line
with the` legs.y The legs are of general channel
shape with their side ilanges 4 extending toward
- each other and with their free ends tapering to
ward'each. other to form end walls 6 (Fig. 2).
, Preferably, the outer portions of the legs normal
ly divergeftoward their :tree ends so as to tempo
by looped head 2.
y
detents can not pass the leg detents unless the 50
rarily hold th- pin _in place when it is inserted
latter and the adjoining faces of the wedge are
separated. It is possible to eilect this separation
upwardly through an opening. >
because the leg detents are formed on diagonally
To spread the free-ends of the legs farther
apart in order to positively lock the pin in the
opposite flanges of the legs. Accordingly, as the
wedge is driven inwardly to spread the pin legs 55
2
-
.
2,122,073
the wedge detents engage the leg detents and
move or'cant them, together with the legs, later
ally in opposite directions as shown in Figs. 3 and
5
ward each other, and a wedge slidably disposed
in said opening’and in said channel legs, said
wedge being adapted ,to spread apart ,the Iree
'7. ’I‘he canting which is thus permitted by the
ends of said legs when driven inwardly of said
lloose ñt of the wedge in the legs separates the
opposite faces of the wedge from detents Il vand
head, and said. wedge and one of said flanges be
ing provided with inter-engaging detents for re--
permits the wedge detents to pass the feg detents.
taining the wedge in its legs-spreading position.
As soon as these detents pass each other the
3. A self-locking key comprising a cotter-pin
legs spring back to their original positions as
shown in Figs. 4 and 8. The wedge’is then in its
operative position in which the free ends of the
legs are 'spread apart far enough to prevent the
key from being withdrawn from opening i3 (Fig.
5) in which lit is disposed. The only way that
having resilient legs connected at one end by a
head provided with an opening, said legsbeing 10
channel shape with their flanges'extending to
ward each other, anda wedge slidably disposed
in said opening and in said channel legs, said
wedge being adapted to spread apart the free
thewedge can be withdrawn from its legs-spread
ends of 'said legs when driven inwardly of said
ing position is by canting legs i in opposite di
rections, as previously explained, to permit the
head, and said wedge and only two diagonally
opposite flanges of said legs being provided with
inter-engaging detents for retaining the wedge
wedge detents vto slide back across the leg de
tents. As it is necessary to apply considerable
Y20 force to the wedge to cause it to thus cant the
pin legs, it will be understood that the likelihood
of the wedge accidentally working out oi‘: legs
spreading position is avoided.
'
It will be noted in Figs. 6, 7 and 8 that there
25 must be suii‘icient clearance- between the key
in its legs-spreading position;
'
4. A self-locking key comprising a cotter-pin 20
having resilient legs connected-.at one end by a
head provided with an opening, said legs being
lchannel shape with their flanges extending lto
Ward each other. anda wedge slidably disposed
in said opening and in said- channel legs, said 25
and the wall of opening i3 to permit the pin legs
wedge being adapted to spread apart the free ends
to cant as shown in Fig. 7. i
of said legs when driven inwardly of said head,
'
1,5
only two diagonally opposite ñanges of said legs
being provided with inwardly projecting detents,
struction of my invention and have illustrated and said wedge being provided with diagonally 30
and described what I now consider to be its best vopposite detents adapted to `engage the sides of
said leg detents to lock the wedge in its legs
embodiment. However, I desire to .have -it under
stood that, within the scope of the appended spreading position. '
claims, the invention may be practiced otherwise ~ 5. A self-locking key _comprising a cotter-pin
According to the provisions of the patent stat
utes, I have explained the principle and con
30
35 than as specifically illustrated and described.
having resilient legs connected at one end by a 35
head provided with an opening, said legs being
1. A self-locking key comprising a Cotter-pin . channel shape with their ñanges extending to
ward each other, and said legs normally diverg
vided with an opening, and a spreading member .ing away from each other in the direction oi
slidably disposed in said opening and between their _free ends, and a wedge slidably disposed 40
said legs and provided with a detent for limiting in said opening and in said channel legs and pro
withdrawal of the member from the pin, said vided with a lateral projection for limiting with
member being adapted to spread apart the free drawal of the wedge from the pin, said wedge
ends of said legs when driven inwardly of said being adapted to further separate the free ends
of said legs when driven inwardly of said head,
45 head, and said member and legs being provided
with inter-engaging detents for retaining the and said wedge and only two diagonally opposite
flanges of said legs. being provided with inter
member in its vRegs-spreading position.
'
2. A self-locking key comprising a Cotter-pin engaging detents for retaining the wedge in its
.
having resilient legs connected at one end by a legs-separating position.
« having legs connected at one end by a head pro
50
headv provided with an opening, said legs being
channel shape with their iianges extending to
maare
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