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Патент USA US2110387

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March 8, 1938.
Original Filed Nov. 9, 1955
£172.93" Zez'a/fexi
_ .
Patented Mar.
- 2,110,387
Ernst Zeidler, Frankfort-on-the-Main, Germany,
assignor to Vereinigte Deutsche Metallwerke
Frankfort - on - the-Main,
Germany, a corporation of Germany
Original application November 9, 1935, Serial No.
49,010. Divided and this application 'August
10,1937, Serial No. 158,306. vIn Germany‘
November 13, 1934
5 Claims. 9 (01. 110-171)
This invention relates to means for detachably
connecting a one-piece nose cap, protecting the
hubs of airscrews, to the hub at several points
gagement with corresponding slots in the one;
piece cap.
A special‘ advantage is obtained by combining
with the locking arrangement, safety devices for
The attachment and- also the dismounting of - securing same and coming into operation at the
airscrew nose caps on and from the hub has hith- ' same time as the former.
erto usually been a matter taking up a good deal
of time, since most of such nose caps consisted of
a plurality of parts which had to be attached to
10 the hub individually, by means of screws, bolts
In order more clearly .to understand the inven
tion, reference is made to the accompanying
drawing which illustrates diagrammatically and
by way of example, several embodiments thereof. 10
and the like. It has therefore been proposed to
In said drawing:—
make the caps in one piece and arrange for the .
Fig. 1 illustrates a side elevational view, some
attachment to be as simple as possible. A con -what fragmentary'and having parts cut away,
ventional method of mounting, which was also of an exemplary embodiment of the invention in
which a nose capis provided with a plurality of
“ the simplest, was by means of a clamping band
vpins engaging slots in a rotatable ring;
or cord. This method had the great disadvan
Fig. 2 depicts a vertical sectional view, also
tage that, in the event of the band being dam
aged only in one place, the band or cord dropped ‘fragmentary, taken on line 2-—-Z of Fig. 1;
Fig. 3 shows' a longitudinal and fragmentary
off and the cap was ?ung off the hub by the ac
sectional view of a modi?edembodiment of the
20 tion of centrifugal force.
It is an object of the present invention to elim
inate the ‘disadvantages of conventional nose
caps and- to provide a one-piece nose cap capable
of being detachably connected or locked to the
25 hub at any convenient number of points, by a/
turn of the hand.
' To this end, according to the invention, a ro
tatable or expandible locking means is provided
which carries all the ?xing members jointly, and
30 'which is indirectly. or directly connected to the
invention in which a. plurality of slots is pro
vided in the nose cap, and a rotatable ring carry
ing a pin for each of ‘said slots cooperates with
said nose cap;
. Fig. 4 is a fragmentary plan View of the em
bodiment illustrated in Fig. 3;
Fig. 5 illustrates a front elevational view, some- '
what fragmentary and having parts in section,
of another embodiment of the invention includ
ing a pivoted bolt lever engaging through cor
responding openings in the nose. cap and con
In the case of conventional nose caps having
a plurality‘ of parts, it is known to connect such
trolled by a rotatable ring;
parts together, at several points simultaneously,
by locking devices. However, these conventional
devices did not solve,,the problem contemplated
by thepresent invention, to wit: the provision of
line 6-6 of Fig. 5;
Fig, 7 shows aifront elevational view somewhat "‘
an easily operated method of connection and re
proyidedgthat the foregoing condition iseful?lled
is rotatable'ring, engaging by means cry-slots, with
Fig. 8 is a ‘vertical sectional view taken on line
8—8 of Fig. '7; and
The design of the detachable connection of
the present invention may vary in point of detail
For-example, it may be established by me '
fragmentary and having parts'in section, of a
further embodiment of the invention embodying .
radially displaceable bolt levers;
lease between a one-piece nose cap and the air
40 screw, or its hub.
on the cap, orqconverselmby ‘
' Fig. 6 depicts a vertical sectional’ view taken on
the principlesof, the invention in which pivoted
expandible bolt levers are provided>.~;capable1of
béing=--brought~into‘ and out: of -'-.1engaigement 7th
slots the
nose cap. according
' ”
to ' Figs.
rand‘- 2.1
meansof pins engaging in slots; in the cap and _ a plate I, the rim of which is bent, rounduatiiaini
thus'eiiabling th lo“ king. to be ve?ecte'd at any
lated lever-11
and controlled byv a push b
' a"
55 manner that said "bolts can be‘broiight‘into' eni"
Fig. 9 shows another arrangement embodying
angle at I’, in thepdirection of theengine-gis, , '1
The one-piece nose cap 5, which is suitably cut
away for the passage’ of the airscrew blades, bears,
represent the pivoted lever or bolt 32 in the re
leased position,
locking of the cap 34 with the plate 23 attached
to the hub is effected by means of radially dis
placeable bolts or push bars 29 which engage,
by means of pins 33, in oblique slots 3| in the ring
32 rotatively displaceable by the handle 33', and
are guided by ?llets 23’ attached to the plate 33.
When the ring 32 is suitably rotated, the ends 10
10 the outer end of the hub 3. "I‘he rim 6 of the
nose cap carries pins 8 which are provided with
33 'of the bars 29' enter openings in the cap 34
and lock the latter as shown in Figs. 7 and 8.
annular grooves and 'coact with the holes, 9 in
the ring 4 and plate I. A lug II, on the ring,
and serving as a handle for rotatively displacing
For the release, the ring 32 is turned' the other
way, the bars 29 being so controlled by thev oblique
slots 3| that their ends 33 release the cap 34.
In the example according to Fig. 9, lever mech
anism is provided for locking the cap 4l.- This
mechanism comprises the levers 35 which, at the
15 the ring 4, protrudes through corresponding slots
in the annular ?ange I’ and ring ‘I.
by means of its inwardly turned rim 6, on the
plate ,I, secured to the hub 3 on the side remote
from the ring 4. The nose cap 5 is centered by
means of a vring ‘I, surrolmding (for example,
riveted on) the annular ?ange I', and the cap
is supported by means of a plate 5' mounted on
the inside-of the cap 5 and adapted to slip over
In assembling the cap 5, the pins 8 attached
- thereto penetrate through the holes 9 in the plate
I and ring 4, said holes being at ?rst in alignment. ~ ends provided with the locking noses 36-!or ex
Rotatively displacing the ring 4 by means of the ample, on the plate (not shown) attached to the‘
hub of the airscrew—are rotatably mounted, the
lug II is all that is now needed-to bring the lat
eral slots I0 into engagement with the grooves
in the pins 8, and thus lock the cap 5 at any
other end being provided with slots 31. Levers
35 are pivoted in pins 4I'. Slots 31 are engaged
by pins 38 seated on the bar 39 which is adapted
to be moved in the longitudinal direction byhand.
On said bar being moved in the direction of the
arrow, the levers 35 are turned through the
agency of the pin-and-slot guides 31, 33, so as to
bring their locking noses out of engagement with
convenient number of points, in accordance with
the number of pins 8 and openings 9, III provided.
‘To release the nose cap 5, the ring 4 is turned
_in theopposite direction until the pins 9 come
out of the slots I0, and the holes 9 in the ring 4
are again inalignment with the corresponding
30 holes in the plate I, whereupon. the nose cap can
be dismounted without any further manipulation.
In the modi?ed embodiment illustrated in Figs.
3 and 4, the outer ring I2 which centers the nose
cap It on. the annular ?ange of the plate ‘I3 at
tached to ‘the hub, is adapted to be rotatively
displaced by means of the handle I2’, and is pro
the nosecap 48. .
(‘The present application is a division of my
co-pending application, Serial No. 49,010, ?led
on November 9th, 1935, now Patent No. 2,092,901,
granted on September 14, 1937, and entitled ‘,‘Nose
I claim:—
- vided with the locking ‘pins I4 which are passed
~ 1. In an aircraft propeller, the .comhina?m
inwards through longitudinal holes IS in the
comprising an airscrew, a hub asoclated with
said airscrew, a one-piece nose cap covering said
hub, a supporting member rigidly connected to
annular ?ange of the'plate I3. The length of
40 the holes I5 determines the extent to ‘which the
ring I2 can be rotated. I The cap I6 is» provided
with bayonet-catch'slots II on the rim adapted
to be inserted between I! and I. .In addition,
the annular ?ange of the plate I3 carries a pin
said hub having a supporting surface conform
ing to the ‘terminal surface .of said nose cap, a
plurality of slots in said terminal surface, fixing
means including displaoeable bolts associated
45. I3’ on which ?ts the slots I6’ in the nose cap. _ with said supporting member adapted to selec
As is evident, from Fig. 4, from which the outer tively engage said-slots in the nose cap, and
ring I 2 is omitted, all that is necessary, after the manually operable elements adapted to simul
cap I6 has been slipped into place, is to turn the taneously displace said bolts from an inoperative
ring I2 so that its pin I 4 enters the bayonet-catch into an operative position. 2. In an aircraft propeller, the combination
slot I1, and thereby lock the nosecap at any
comprising an airscrew, a hub associated with
convenient number of points.
Figs. 3 and 4 also show a safety catch which said airscrew, a one-piece nose cap covering said comes into operation at the same time as the hub, a supporting member rigidly connected to
locking device. Secured (for example, riveted)‘ said hub having a supporting surface conforming
on. the annular ?ange of the plate I3, at I9, is to the terminal surface of said nose cap, a pin
a ?at spring I 3 carrying a stud 29. Directlythe rality of'slots in said terminal sur?ce, ?xing
ring I! has arrived in the locking position, said means including displaceable bolts associated‘
stud 20 springs through the annular ?ange of the 4 with said supporting member adapted toselec
tively engage said slots in the nose cap, and means
plate I3 into a hole in the ring I! and thus pre
vents the latter from accidental reversion. In
order to release the cap II, the catch stud 23 must
first be pushed inwards, before the'ring I! can
be turned back.
.. ' w
is According
attached to
to Figs,
the hub
5 and
6, the
the 2|,
including a manually operable ring-like locking
member adapted to simultaneously displace said
bolts from an inoperative into an open?veposiv '
3. In an aircraft. propeller, the. mllnatlon
comprising an airscrew, a hub amounted with‘
said airscrew, a one-piece nose cap covering said
?ange of which the cap 31 is. slipped, is provided - ‘hub, a supporting member rigidly fastened to'aaid
_ with~ rotatably mounted or pivoted levers or bolts
22, the ‘one- arm of which is engaged by pins 23,
seated on the» ring-24, which is. adaptedto be
‘hub having a supporting surface conforming to
rotated by means of the handle 24', said pins supporting surface, a slot in" said nose‘cap for
enabling the other arm to enter at 3! correspond- , each of said bolts, and a rotatable ring-like mem
ing slots '39 in the cap 31,. directly the ring 34 is ' ber, adapted to collectively displace said bolts
- rotatably_ displaced in'the one direction
I from an inoperative into an operative position to
'75 ofthehandle 3.4’.
4. In an aircraft propeller, the combination . comprising ‘an airscrew, a 'hub associated with
said airscrew, a? one-piece nose cap covering .said'
comprising an airscrew, a hub associated with
said airscrew, a one-piece nose capx'covering said‘
hub, a supporting, member rigidly fastened to said
hub and having asu'pporting surface conforming
to thetern'iinal surface of said nose cap, a plu
rality of pivoted bolts associated with said sup
- porting surface,'a slot in the terminal portion of
' said nose cap for each of said bolts, and-a manu
ally operative ring-like member co-op'erating with
said bolts and capable of simultaneously turning
said bolts around said pivots to engage said slots
hub, a supporting member‘ rigidly fastened ‘to
said hub and‘v having a supporting surface con
forming to the terminal portion of said nose cap,
a plurality of slots in the terminal portion of said
nose cap, a pivoted lever bolt for each of said '
slots mounted on said supporting member one‘end
of said lever bolts being adapted to engage said
slots, ‘and a push, bar engaging the other end of
said lever bolts and adaptedto move same from
an inoperative into an ‘operative position to‘ en-'
gagesaid slots and to retain said nose cap.
and to hold said nose cap.
" ’
5. In an aircraft propeller, the combination L
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