Improvements in Striking Mechanism for Clooks.
Year: 1899

page_text: Date of Application, 3rd Jan., 1899-Accepted, 15th Apr., 1899
Improvements in Striking Mechanism for Clooks.
I, BENJAMIN JOSEPH BARNARD MILLS, of 23, Southampton Buildings, in the
County of London, l'atent Agent, do hereby declare the nature of this invention (a
communication to me from Gebrüder Junghans, Clock Manufacturers of Schram-
berg, Wurtemburg) and in what manner the same is to be performed to be par-
ticularly described and ascertained in and by the following statement:-
This invention relates to striking mechanism in an arrangement similar to that
where a rack is employed, in connection with which however, instead of the ordinary
gathering pallet, a different apparatus, and one not requiring the "locking fall,"
serves for lifting the rack or controlling lever which is allowed to fall, before the
operation of striking, on the striking snail, into the position ready for striking.
The auxiliary means for replacing the gathering pallet consists preferably of a
spiral groove disc fixed on the gathering pallet shaft or a so-called cylindrical
wheel with spirally formed guiding course for the engaging of the guiding or con-
trolling lever, which is suitably furnished with a nose-piece or rack-toothing.
The throwing out of engagement by means of the lifting pieces is most easily
effected by axial or endwise motion of the shaft of the gathering pallet, which
carries on its front end the gathering pallet or the substitute therefor; it may
however be otherwise brought about viz., by the throwing out of engagement of the
guide or controlling lever or by the temporary forming of a gap at the beginning
of the spirally formed guiding course. In the case, where the endwise movement
of the gathering pallet shaft serves for effecting the operation, the arrangement of
an hour and quarter hour striking mechanism can be combined with the apparatus
in such a manner that the quarters are struck by two hammers and the complete
hour or hours with one hammer thrown out of engagement.
In the accompanying drawings, five different modifications of the improved
striking mechanism are illustrated by way of example.
Fig. 1 is a front view of the first form of the invention, which is characterised
by the employment of the spiral groove disc and consists of a striking mechanism
arranged in the ordinary manner, in conjunction with a half hour striking arrange-
ment.
Figures 2 and 2 are respectively a plan and a sectional plan of Fig. 1.
Fig. 3 is a similar view to that in Fig. 1 but illustrating the second modification
of the invention, in which the "rack organ" is a cylindrical wheel on an endwise
movable gathering pallet shaft and which wheel allows at the same time the
putting out of engagement for bringing about the " one step" fall of the controlling
lever and the striking of the half hour.
Fig. 4 is a plan view of the essential parts in Fig. 3 and Fig. 5 a detailed view
of the cylindrical wheel together with the rack belonging to the controlling lever
seen in elevation from the left, in relation to Fig. 3.
Fig. 6 is a view of the third modification of the invention in which a cylindrical
wheel corresponding with the style of construction of the second modification is
employed, but with a different "releasing" arrangement, no endwise moving
shaft being employed.

page_text: Fig. 6 and of the auxiliary "releasing" means belonging thereto.
Fig. 8 shows a modified form of the cylindrical wheel.
Figures 9 and 10 are views of a fourth modification of the invention comprising
an hour and quarter-hour striking mechanism, the former figure being intended
to illustrate the locking position of the parts, and the latter the position by means
of which the parts are made ready for the "releasing" action.
"
Fig. 11 is a plan view of the essential parts of Fig. 9 and Fig. 12 a sectional
plan drawn on the line in Fig. 9.
Fig. 13 shows in plan, on an enlarged scale, the movable "hammer pin sleeve"
on the hammer shaft, which is subjected from time to time to the disengaging
operation in Fig. 12 this sleeve is not visible on account of the hammer-shaft being
over it, Fig. 14 is a view of the fifth modification of the invention, in which con-
struction of striking mechanism a double gathering pallet, likewise seated on an
endwise movable shaft, serves for the raising of the rack; and the striking of the
quarters before the hours, as in the case of the fourth modification of the invention
is brought about by two hammer shafts, one of which can be thrown out of engage-
ment.
Fig. 15 is a plan view of Fig. 14.
Fig. 16 is a section on the line II in Fig. 14.
"
The first form of the invention (Figs. 1, 2 and 2) is distinguishable by the fact
that a special groove disc V instead of a gathering pallet, is attached to the gather-
ing pallet, shaft u, and that this together with the shaft u can be moved end-
wise or axially. By means of a spring 6 which engages with the
back end of the shaft u (Fig. 2) for example, the spiral groove disc V
is normally pressed forward into the position indicated in full lines in
Fig. 2.
This position corresponds to the engaging of the pin r which
projects sideways from the controlling lever R, with the spirall
" escape-
ment groove of the diso V. The latter is furnished on its periphery with two
additional pieces v and f of which the one is formed as a wedge to serve as a
releasing" check or butt, the other f which serves a similar purpose in connection
with the locking, lying against a pin e of the guide lever R, as will be seen at
Fig. 1. When the clock is to strike, or preparations are to be made for striking
the complete hour or half hour, as usually effected from the going train (by means
of cam ) the releasing piece or lever a pivoted on the front plate of the clock
work, is moved so that its upper wedge shaped end oscillates first to the left and
then, under the influence of the spring again to the right. When it swings to
the left, the end of the lever mentioned presses the spiral groove disc V together
with the shaft u back by acting against the wedge shaped "releasing" check or
butt v, so that for this position, indicated by dots in Fig. 2, the pin of the con-
trolling lever is freed from the spiral groove and, in consequence, the controlling
lever R is able to fall to the "snail" P or to the half hour striking step g. When
the releasing piece a swings back, the spiral groove disc V becomes free to be
pushed forward by the spring f and to rotate under the impulsion of the running
down striking mechanism, checked by the fly. When the spiral groove disc V
is pushed forward, it engages again with the pin r of the lever R and as a matter
of fact according to the "striking step" on to which the lever arm descends with
its arm R¹ or pin p, the pin r enters a spiral escapement groove lying nearer to or
further from the centre of the disc. The rotation of the spiral groove disc then
effects the raising of the controlling lever R, as the pin r is carried up towards the
centre of the disc V one step for each rotation. The number of strokes produced
during this, by the "lifting pin wheel" L with the assistance of the hammer
shaft H, corresponds to the number of "lifting steps," in other words, to the
rotations of the spiral groove disc V, until the controlling lever is raised to the
high position. As the upward stroke of the latter terminates, the pin e belonging
thereto comes in the way of the locking check or stop f on the spiral groove dise

page_text: and brings the striking mechanism to a standstill, the parts returning to the
original position (Fig. 1). Upon the approach of the time for the striking of the
half hour, the arm ¹ connected with the lever B and incidentally arranged with
spring action (for the purpose of modifying the sound caused by the drop) regulates
with its pin the fall of the lever to the "half hour striking step" g so that a
single stroke follows, whereas for the rest, the number of complete hour strokes
is regulated by the falling of the same pin p to the respective "step" of the snail P.
As will be seen from the description, the spiral groove disc completely fulfils
the purpose of the ordinary gathering pallet and beyond this enables the em-
ployment of a special locking lever or the "locking fall" to be dispensed with, so
that the so-called preliminary and subsequent warnings of the striking mechanism
are omitted.
The second modification of the invention, illustrated in Figures 3 to 5, is intended
as an alteration of the described mechanism, which is distinguished by the employ-
ment of a cylindrical wheel W instead of the spiral groove disc. This wheel con-
sists of a spiral hoop furnished with spokes and it is firmly fixed on the gathering
pallet shaft u, which is movable endwise, as in the first modification of the inven-
tion and under the influence of the spring b. The pressing back action to be
effected by the releasing piece or lever, a from time to time before the striking
could similarly as in the previously described instance be produced by means of
a "releasing" check or stop on the circumference of the cylindrical wheel; instead
of this the releasing piece a is furnished with a cam shape piece a¹ which passes
through a slot in the plate A and enables a spring b¹ to be pressed back behind the
plate A (Fig. 4), this spring in turn acting on a collar e fixed on the shaft u. If,
consequently, the releasing lever a is swung backwards and forward by the going
train, or in other words by means of the releasing cam d, the cylindrical wheel W
is temporarily pushed back to the position indicated by dots in Fig. 4. The
further rotation of said wheel is prevented provisionally by a striking pin v
(Fig. 3 and 5) projecting from the plate A, and only effective in regard to this
position of the wheel W. The rack-toothing z (Fig. 5) is formed on a backwardly
directed bow-shaped piece on the controlling lever R, and the spiral hoop of the
cylindrical wheel W lies in engagement therewith as long as the wheel is pushed
forwards by the spring b. If the pushing back operation on the wheel W be
brought about with the previously mentioned auxiliary means a 6', the con-
troling lever R or pin p falls on to the "snail" P. The cylindrical wheel W
which is being moved forward and is free to rotate is held by the part under one
of the rack teeth which presents itself for the purpose; as the spiral course of the
cylindrical wheel piece corresponds with the tooth space on the rack-toothing z,
and thus the controlling lever is raised, during the rotation of the cylindrical
wheel W, the rack teeth coming successively into engagement until, the starting
position of the stroke having been reached, the last rack-tooth z' which is wider
than the others, comes against the butt or stop f¹, of the cylindrical wheel W, and
prevents the further rotation of said wheel and consequently the further raising of
the lever R. The rotations of the wheel W correspond to the number of strokes
given by means of the "lifting pin" wheel L and the hammer shaft H, in pro-
portion to the limiting of the descending movement of the lever R by means of
the step" of the "snail at the time coming into action. The described arrange-
ment for the striking mechanism can be easily adapted for striking the half hours
also, by making the last rack-tooth 2¹ somewhat shorter than the others, so that,
upon the wheel W being pushed back, to a certain limited extent, by means of the
cam which projects somewhat less than d, the said rack tooth 2³ can fall past
the butt or stop end of said wheel, whilst the next tooth will nevertheless be
detained; therefore the conditions for raising the lever again to the extent of
the one tooth by a rotation of the cylindrical wheel, and consequently for the
striking of a half hour stroke, are furnished.
In the striking mechanism of the kind described in connection with the first
and second modifications of the invention, the peculiarity of which is the replacing

page_text: of the gathering pallet by a "lifting organ" acting by means of a spiral course
many alterations may be introduced, without departing from the principle on which
the invention is based. The lifting or "releasing" instead of being effected by
the endwise motion of the gathering pallet shaft together with the "litting organ
may be brought about by arranging the controlling lever itself or a part of the
same, so that it can be removed from the "lifting organ," in order to put it in or
out of engagement.
That it is not necessary, for the disengaging of the controlling lever to arrange
the gathering pallet shaft with the cylindrical wheel so as to be movable endwise
is shown further by the third modification of the invention which is illustrated
in Figs. 6, 7 and 8,
Fig. 8 is an enlarged detailed view of the cylindrical wheel W, which, in this
instance, is fixed on a gathering pallet shaft u that is not movable endwise. The
wheel thus remains in the given plane and thé "releasing" of the controlling
lever R furnished with the rack toothing-z, is effected by the forming of a gap
on the cylindrical wheel piece when the action is taking piece. The inner end
of the cylindrical wheel piece is made for this purpose as a separate part wand
in connection with one arm of a two-arm lever, which is seated behind the cylindrical
wheel and is pivoted to the middle of the same and to the gathering pallet shaft u¹.
The other arm of the lever i, which is influenced by a small spring in the
direction of closing the gap, carries a projecting warning pin which, on the one
hand, forms a check or butt and, on the other, is liable to be influenced by the
lifting piece a, as will be seen by Fig. 8. As a check or butt, this pin j deter-
mines the measure of the relative rotation between the said lever and the cylin-
drical wheel, as it can be carried with the lever i as far as the outer projection w1
of the wheel W.
-
If the striking mechanism has been "released" by the actuating of the releasing
piece a by means of the cam d, and in consequence of the striking of the same
against the warning pin j, the lever is pressed back, the spring will thereby
be put under tension and the end of the lever, with the additional part w will be
removed from the end of the cylindrical wheel piece. There results therefore, as
far as to where the rack toothing z of the controlling lever R was supported, a
gap (Fig. 8), and the controlling lever R can consequently fall on to the "snail
step.
As soon as the releasing is completed, or, in other words, the releasing piece
moved back into its first position (Fig. 6), the gap y is closed by the spring i,
the part w being pushed on-to the end of the cylindrical wheel piece, and the
raising of the controlling lever begins and ends exactly as described in relation to
the second modification of the invention.
Incidentally the half-hour strokes are struck in this third modification of the 4
invention, as follows.
The controlling lever R has, in addition to the pin p on R¹, a second falling
ping, which falls on to one of the projections or additional pieces on one of
the wheels of the going train.
56
The altered construction illustrated in Fig. 8* renders possible the striking at 4
the half-hours without the assistance of a follower furnished with additional
pieces and entirely without the employment of a half-hour striking step," as
the letting down of the controlling lever, similarly to that described in connection
with the explanation of the striking mechanism belonging to the second modi-
fication of the invention, takes place in consequence of a limited, not a complete, !
swinging out" of the releasing piece. Consequently the rest of the arrangement
shown in Fig. 8 is supposed to be supplemented in accordance with Fig. 3, in
which the releasing piece a has to be actuated for the "releasing" preparatory to
the half-hour striking by a cam d³, which is short as compared with d.
The end of the releasing piece acts, in agreement with Fig. 8, against the warning
pin of a lever i, which, in this case, is seated behind the disc body W' of the
cylindrical wheel and under the influence of the spring and extends, with the

page_text: additional piece w projecting on the one arm, through an incision in the body of
the disc. Corresponding with this arrangement, the effect so far as the complete
striking is concerned, is exactly the same as that described in relation to Figs. 6, 7
and 8. The difference consists in the fact that the side face of the rack-toothing z
is furnished with a slightly projecting nose-piece 3. If the releasing piece is
caused to swing a shorter distance by means of the cam d' (Fig. 3) and, in conse-
quence, the lever i, with the additional piece w be moved in a less degree, the gap
between w and the end of the cylindrical. wheel piece is opened only so far as to
allow the lowest piece of the rack toothing on the lever R to pass through, whilst
the nose piece takes hold of the part to and consequently limits the descent of
the lever to one step. Following this the controlling lever R is raised this one
step, a stroke being struck indicating the half-hour. If the striking of the com-
plete hour or hours is to be effected, the gap between w and the end of the cylindrical
wheel piece opens completely and allows the controlling lever to descend as far as
the "snail," the nose piece passing by the additional piece w.
The hour and quarter-hour striking mechanism illustrated in the further
Figures 9, 10, 11, 12 and 13, is arranged with an endwise movable gathering pallet
shaft and spiral groove disc V according to the first modification of the inven-
tion. For effecting the four-quarter striking before the striking of the complete
hour or hours in spite of simultaneous "releasing," the following means are
applied. The front extension of the shaft 7 of the "lifting-pin" wheel L carries
a wheel firmly fixed thereon with ten teeth, or so many as there would be
according to a suitable estimation of the clock work. For engaging with the fly
wheelt, a short tooth-segments is provided, which forms one piece in combina-
tion with an oscillating shaft o and a "falling lever" n, and is linked to one end
of an angle lever m, which belongs, as a releasing piece, to the four-quarter
striking mechanism; its upwardly directed arm being indirectly actuated by
means of the principal releasing piece a. If the principal releasing piece a be
moved in consequence of a blow from the disengaging pins d' d³d, the
lifting piece m will consequently be likewise moved against the power of a
spring m³, and in such a way that the tooth-segments will be carried down below
the toothed pinion t and be set free, with the "falling lever n, to take the deter-
mined position of rotation on the axis o now offered or permitted by the quarter-
hour "striking steps" q², q², q³ or g, before the segments comes into engagement
with the toothed pinion, upon the lever m moving upwards again. The seg
ments, which is now carried forward to the left in consequence of the rotation
of the "lifting pin" wheel L, acts by means of an inwardly bent pin s', on the
hammer pin sleeve h¹ specially illustrated in Fig. 13 and having a limited rota-
tion, this sleeve is mounted on a hammer shaft h only acting in connection with
the striking of the quarters, and above which is arranged the other hammer
shaft H (Fig. 12) with firmly fixed hammer pin H*. Upon each striking of the
last quarter, the segment pin s, which acts under the bow shaped end of the
lever on the "hammer pin sleeve" h¹, falling into the indented lever rest h³
(Fig. 9) allows the hammer shaft sleeve h¹ to turn to such a position that the
hammer pin * passes out of the range of the "lifting pin wheel" L. Pre-
viousky, during the striking of the quarter hour, the pin s retains the hammer
pin sleeve in the position of activity by carrying higher the limit to which the
arm falls back, (Fig. 10).
With this arrangement a locking contrivance is combined, by means of which
the spiral groove disc V or gathering pallet shaft u when it has been pushed
back endwise in the course of the "releasing" operation, cannot return to the
position of its "lifting activity" on the controlling lever R until the last
(doubled) quarter striking is effected; only thus is the delivery possible, according
to the adjustment of the lever R on the hour snail P, of the individual hour.
strokes, which follow the doubled strokes produced by the two hammers. The
auxiliary locking means consist of a two-arm lever, the one arm k of
which, in the form of the invention shown (Fig. 11), placed behind the plate A,

page_text: is pressed upwards by the spring against a collar n* on the gathering pallet
shaft u, in order, in the case of the latter being pushed back, to prevent for a
while its being pushed forward again by taking hold of it between the collar u*
and the back of the plate (or it may be in a circular groove). The disengaging
of this locking apparatus is effected by means of the lever arm k', which, with an
adjusting screw *, finds a counter-bearing on a projection of the toothed
segment s.
If, in such an arrangement of the parts of the apparatus, the disengaging
motion be communicated to the releasing lever a and indirectly to the releasing
lever m, the oscillation of the first-mentioned lever a, causes the latter to act
against the butt or stop v, and thereby causes the spiral groove disc V or gathering
pallet shaft u, to be pushed backwards axially corresponding with the fall of the
lever R, which is at once held in the pushed back position by means of the lever
arm passing behind the collar, as shown by dots in Fig. 11. When the
disengaging oscillation occurs, the releasing lever m allows the toothed segment s
under the toothed pinion t to come out of engagement with the latter, in order
that it may take the position caused by the falling of the lever n on to the parti-
cular "striking steps" (7. 2 9. 9). Upon the two releasing levers a and m
awinging backwards, the striking mechanism is free to move and the toothed
segments comes below the toothed pinion t into the position of engagement there-
with, in order to be moved by the same to the left in consequence of the rotation,
now commencing, of the "lifting pin wheel" L; during this time both hammers
H, h, are active and the four quarters are struck, the spiral groove disc V being
correspondingly often inactive, that is, rotating without being in engagement
with the controlling lever pin. As the toothed segments is moved to the left, it
presses the lever arm A, lying against the same at *, back in the same direction,
whereby the lever arm k is drawn down to an equal extent out of its engaging
or locking position in front of the collar * of the gathering pallet shaft . As
soon as the last quarter stroke has been struck as a double stroke by the two
hammers and the segments moved quite to the left, according to Fig. 10, in
which the disengaging of the hammer shaft h, furnished with the sleeve h¹, takes
place, as previously described, the throwing out of engagement of the locking
arm & from the gathering pallet shaft u is completed and the latter, together with
the spiral groove disc V moves quickly under spring action into its front position
(Fig. 11) so that the pin r of the controlling lever R is held in one of the spiral
courses and owing to the continuous rotation of the spiral groove disc V is raised
until the locking of the striking mechanism is ended and the parts brought back
to the starting position (Fig. 9). The number of the hour strokes, which are
produced by means of the hammer shaft H alone, after the other hammer shaft h
has been thrown out of engagement, corresponds with the rotations of the spiral
groove disc V from the time of the raising of the controlling lever R.
The position illustrated in Fig. 10 shows the position of the hands at half past
nine. Accordingly, after the releasing, two double strokes will be produced,
until by the rotation of the hammer pin sleeve h¹ by means of the segment pin s',
the hammer shaft h is put out of action and by the movement of the lever k
the gathering pallet shaft u together with the spiral groove disc V is placed
ready for the raising of the controlling lever R, the hour strokes are then pro-
duced by the hammer shaft H alone, the lever R being duly raised.
The putting out of engagement of the hammer shaft, instead of being effected
as in the striking mechanism arrangement just described, by the rotating of a
hammer pin sleeve (Fig. 13) can be brought about by the endwise motion of such
a sleeve. This mode of throwing out of engagement is the basis of the fifth
modification of the invention, illustrated in Figures 14 to 16, there being besides
a similar four quarter striking action, and moreover, a doubled gathering pallet U
being employed. The latter is fixed on the endwise movable gathering pallet
shaft and acts with its two lifting pins T, which projects from the front face
and alternately engage in the rack toothing Z, in such a manner that at each half

page_text: rotation, the rack lever R is raised to the extent of one tooth and held. As a
grip for the releasing lever a in connection with the pushing back of the gathering
pallet U, the latter is furnished with two arms 8 having wedge shaped extremities.
The snail P has each of its several snail steps, formed in step fashion as seen in
Fig. 14, so that the rack lever R or pin p of the arm R', upon falling from the
gathering pallet U, which results from the pushing back of the latter by the
releasing lever a, falls so many steps lower in proportion as a quarter striking
indicated by a double stroke, precedes the simple hour strokes.
If by this arrangement the disengaging of the second hammer shaft h is effected
in proper time that is between the first and fourth strokes the raising of the rack
lever whch begins immediately after the releasing is no hindrance to the regular
delivery of the hour strokes and consequently the locking contrivance (by means
of the lever, Figures 9 and 10) described in the fourth modification of the
invention, is unnecessary in this case. The throwing out of engagement of the
hammer shaft h during the continuous actuating of the hammer shaft H, the
hammer pin H* of which lies in constant engagement with the lifting pin
wheel L, is produced with essentially the same auxiliary means as in the case
of the fourth modification of the invention.
The toothed segments with the downwardly spring operated lever n fixed on
the same shaft o has its bearings on the auxiliary releasing lever m, indirectly
actuated by the releasing lever a. After the releasing, whilst the segment s
moves down from the toothed pinion t fixed on the lifting pin wheel shaft / the
lever finds support on one of the snail steps g¹ 7 7 7 Thereby the subse-
quent engaging of the segments with the pinion is effected in such a manner
that, in consequence of the rotation of the latter, during the actuating of the
striking mechanism, the segment s moves to the left and after 1, 2, 3 or 4 strokes
have been given, takes the locking position, the further rotation of the pinion t
and further striking of the mechanism being possible notwithstanding. As the
segments is moved to the left it carries with it a wedge like attachment K
(Fig. 16) loosely jointed to its back end, and which by acting against a pin J on
the hammer shaft sleeve h', pushes this axially against the action of a spring F.
so that the pin *, projecting from the said sleeve passes out of the range of the
lifting pin wheel L (Fig. 14), whilst after the releasing, the engaging (for 1 to 4
strokes) has been rendered immediately possible. As soon as this throwing out
of engagement is effected the rest of the strokes for the striking of the hours are
produced by means of the hammer shaft H alone. The final locking of the
striking mechanism is effected by one of the cam shaped arms of the gathering
pallet U taking hold of the pin e of the rack R which latter rests in its upward
position against a check or stop E.
It is obvious that in all forms of the invention another axis of the striking
mechanism can be put in connecton with the "lifting organ" for the controlling
lever, instead of the shaft indicated as a gathering pallet shaft.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
--
1. Striking mechanism for clocks, with a device replacing the gathering pallet
in the raising of the rack lever and also serving for the final locking, consisting
of a spiral groove or spiral hoop wheel firmly fixed on the endwise movable or
non-movable striking mechanism or gathering pallet-shaft, which is in disen-
gageable engagement with a projection or a rack toothing of the controlling
lever, in such a manner that the latter, upon the "releasing" operation taking
place, under endwise movement of the gathering pallet shaft, is set free to fall
and subsequently, in consequence of the rotation of the gathering pallet shaft,
can be raised again to the locking position, the striking being duly effected,
substantially as herein set forth.
2. A modification of the striking mechanism as described under Claim 1, in

page_text: which the end of the spiral groove or spiral hoop which supports the controlling
lever in its final locking position, is arranged as a special movable part (w Figs. 8
and 8), in order that by the action of the releasing piece, this part can be moved
away from the spiral hoop,. in order to permit the fall of the controlling lever,
which otherwise must be effected by the endwise motion of the gathering pallet
shaft, substantially as herein set forth.
3. A modification of the striking mechanism described in Claim 1, in so far as
the releasing is effected by the pushing back of the gathering pallet shaft
carrying the spiral groove disc or spiral hoop wheel through the action of the
releasing piece, the distinguishing feature being that, for the "releasing" opera-
tion, connected with the half-hour striking, the shaft is not pushed back to the
same extent as for the striking of the full hour or hours, in order, by the stopping
(or detention) of a stop or butt lying above and of a tooth projecting from the
controlling lever, to restrict the descent of the last-mentioned lever to one step
whereby the subsequent one step raising" is brought about, whilst a stroke is
duly struck, substantially as herein set forth.
"
4. A modification of the striking mechanism according to Claim 2, with the
movable end piece w arranged in such a manner that, for the half hour striking,
the removal of this piece from the end of the spiral groove or spiral hoop wheel
is only partially effected, the end piece coming against a projection above on the
controlling lever, the descent of which is limited to one step whereby the subse-
quent one step raising of the lever is brought about, whilst a stroke is duly
struck.
5. A modification of the striking mechanism according to Claim 1, with end-
wise movable gathering pallet shaft for effecting the releasing operation, and
with two simultaneously actuated quarter hour striking hammer shafts, one of
which is thrown out of engagement as follows:-After the releasing operation,
a toothed segment which is then out of engagement with a pinion on the lifting
pin wheel shaft and which afterwards re-engages therewith in proportion to the
striking step adjustment, moves the pin of the hammer shaft out of range of the
lifting pin wheel after the delivery of one to four quarter strokes, thereby a
locking lever is raised by which the gathering pallet shaft after the releasing is
next pushed back and held with its spiral groove disc or spiral hoop wheel out of
engagement with the controlling lever, so that the rotation which serves for the
quarter hour striking may not only co-operate in the raising of the controlling
fever, but that the raising of the latter from the hour snail begins only after
completion of the (doubled) quarter hour strokes substantially as herein set forth.
6. A modification of the striking mechanism according to Claim 1, in which a
gathering pallet which engages in the rack toothing with two pins is attached to
the endwise movable gathering pallet shaft, in place of the spiral grove disc or
spiral hoop wheel, which gathering pallet can be released by the pushing back
of the gathering pallet shaft and by means of one or other of two projecting or
additional pieces, effects the final locking, substantially as heroin set forth.
Dated thin 91 -
1000
HARRIS & MILLS,
23, Southampton Buildings, London, W.C., Agents.