Horology: time measuring systems or devices – Escapements – With oscillating or reciprocating means
Patent
1995-08-09
1996-12-17
Roskoski, Bernard
Horology: time measuring systems or devices
Escapements
With oscillating or reciprocating means
84484, G04B 1500, G09B 1500
Patent
active
055860885
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a metronome mechanism comprising a U-shaped bearing frame with a web and two limbs protruding from the web, a winding stem carrying a spring housing, a ratchet wheel stem carrying a ratchet wheel and bearing bushes arranged on the limbs of the bearing frame for receiving the ends of the winding and ratchet wheel stems.
In known metronome mechanisms of this kind (DE-AS 26 36 782), the bearing bushes for receiving the ends of the winding and ratchet wheel stems are arranged in the form of simple bores directly on the two limbs of the bearing frame made of sheet metal, and these stems bridge the space between the limbs. To enable the stem ends of the winding and ratchet wheel stems to be inserted into their bearing bushes, the limbs of the bearing frame have to be bent sideways and then bent back into their original position. This often results in deformations of the bearing frame, for example, in the limbs no longer protruding perpendicularly from the U-web of the frame which joins these. Frictional losses can occur as a result of this and impair the accuracy of the metronome mechanism. In addition, the bending open and back of the limbs of the bearing frame and the introduction of the stem ends has hitherto had to be carried out manually and could not be automated.
The object of the invention is to so improve a generic metronome mechanism that the ends of the winding and ratchet wheel stems can be mounted without bending the bearing frame.
The object is accomplished in accordance with the invention by the bearing bushes being formed on two separate side parts which are adapted to be pushed onto the limbs of the U-shaped bearing frame and firmly locked on the limbs.
The following description of a preferred embodiment of the invention serves to explain the invention in greater detail in conjunction with the attached drawings, in which
FIG. 1 is a perspective view of a metronome mechanism from the right;
FIG. 2 shows the metronome mechanism of FIG. 1 from the left;
FIG. 3 is a side view of the metronome mechanism from the left;
FIG. 4 is a detailed view of a U-shaped bearing frame;
FIG. 5 is a perspective detailed view of a right side part;
FIG. 6 is a perspective detailed view of a left side part;
FIG. 7 shows the right side part of FIG. 5 with a bearing bush for an anchor stem arranged integrally on this part.
FIG. 4 shows a U-shaped bearing frame 1 made of sheet metal with a web 2 and two limbs 3,4 protruding from this web. The limbs 3, 4 of the U-shaped bearing frames hitherto used in metronome mechanisms comprised bearing bushes in the form of bores into which the ends of a winding stem and a ratchet wheel stem were rotationally insertable, and these stems bridged the space between the two limbs 3, 4. To do so, the two limbs 3,4 had to be bent sideways to enable the ends of the aforementioned stems to be inserted into their bores. The limbs 3, 4 then had to be bent back into their original position again. It is obvious that inaccuracies could occur here and the limbs 3, 4 often failed to return to their correct initial position, which could adversely affect the running and the accuracy of the metronome mechanism.
To avoid bending of the limbs 3, 4 when mounting the winding and ratchet wheel stems, there are provided in accordance with the invention--cf., in particular, FIGS. 1 and 2--two side parts, namely a left side part 5 and a right side part 6, which in a manner described hereinbelow are pushable onto the free ends of the limbs 3, 4 of the bearing frame 1 and lockable thereon. The left side part 5 is illustrated in detail in FIG. 6, the right side part 6 in FIG. 5. There are formed on the left and right side parts 5, 6, in a manner which will likewise be described hereinbelow, bearing bushes which receive the ends of a winding stem 7 and a ratchet wheel stem 8, respectively. When assembling the metronome mechanism, the two side parts 5, 6 are first placed with their bearing bushes on the ends of the winding and ratchet wheel stems 7 and 8, respectively. The two side parts 5,
REFERENCES:
patent: 271448 (1883-01-01), Greene et al.
patent: 734032 (1903-06-01), Adams
patent: 1664010 (1928-03-01), Welch
patent: 3662538 (1972-05-01), Wittner
patent: 4237549 (1980-12-01), Harle
patent: 4333172 (1982-06-01), Chen
Roskoski Bernard
Rudolf Wittner GmbH & Co.
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