Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
WATCH OR TIMEPIECE
Document Type and Number:
WIPO Patent Application WO/2021/002745
Kind Code:
A1
Abstract:
Watch or timepiece (1) comprising a wheel (2) and a mass (3) that drives the wheel (2), the mass (3) being subjectable to environmental forces for bringing it into the status of a moving mass (3), wherein the mass (3) is part of a system comprising a frame (4) and at least a first elastic beam (6) suspending the mass (2) from the frame (3).

Inventors:
WEEKE SYBREN LENNARD (NL)
LUSTIG MAARTEN PIETER (NL)
Application Number:
NL2020/050428
Publication Date:
January 07, 2021
Filing Date:
June 29, 2020
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
FLEXOUS MECH IP B V (NL)
International Classes:
G04B5/18; G04B5/08; G04B5/19
Domestic Patent References:
WO2018115014A22018-06-28
WO2019125145A12019-06-27
Foreign References:
GB766295A1957-01-16
GB766295A1957-01-16
Other References:
D. FARHADI MACHEKPOSHTI ET AL: "A Review on Compliant Joints and Rigid-Body Constant Velocity Universal Joints Toward the Design of Compliant Homokinetic Couplings", JOURNAL OF MECHANICAL DESIGN, vol. 137, no. 3, 1 March 2015 (2015-03-01), US, pages 032301, XP055495882, ISSN: 1050-0472, DOI: 10.1115/1.4029318
Attorney, Agent or Firm:
VAN BREDA, Jacques (NL)
Download PDF:
Claims:
CLAIMS

1. Watch or timepiece (1) comprising a wheel (2) and a mass (3) that drives the wheel (2), the mass (3) being subjectable to environmental forces for bringing it into the status of a moving mass (3), wherein the mass (3) is part of a system comprising a frame (4), a first elastic beam (6) and a second elastic beam (7), wherein the first elastic beam (6) and the second elastic beam (7) are both provided with a positive stiffness, and wherein the mass (3) is suspended from the frame (3) through said first elastic beam (6) and said second elastic beam (7) enabling the mass (3) to carry out a back-and-forth movement while being suspended from the frame (4), characterized in that the back-and-forth movement is a rotational back-and-forth movement.

2. Watch or timepiece according to claim 1, characterized in that the mass has a center of rotation (10) which differs from the center (11) of the frame (4) from which the mass (3) is suspended.

3. Watch or timepiece according to claim 1 or 2, characterized in that the wheel (2) is a ratchet wheel and is driven using an intermediate flexure or flexures (8, 9) that are connected to the moving mass (3) .

Description:
Watch or timepiece

The invention relates to a watch or timepiece comprising a wheel and a mass that directly or indirectly drives the wheel, wherein the mass is subjectable to environmental forces for bringing it into the status of a moving mass.

In mechanical wrist-watches kinetic energy of the wrist is harvested and transferred via a ratchet wheel and gears to a barrel spring (main spring) to rewind the watch. The energy stored in the barrel spring is transferred via transmission gears to an escapement wheel that will power and keep the oscillator of the watch to move forward, and through a gear train advance the hands of the watch.

GB 766,295 discloses a watch or timepiece comprising a wheel and a mass that drives the wheel, the mass being subjectable to environmental forces for bringing it into the status of a moving mass, wherein the mass is part of a system comprising a frame, a first elastic beam and a second elastic beam, wherein the first elastic beam and the second elastic beam are both provided with a positive stiffness, and wherein the mass is suspended from the frame through said first elastic beam and said second elastic beam enabling the mass to carry out a back-and-forth movement while being suspended from the frame.

It is an object of the invention to provide a suitable mechanical and improved means to harvest energy from the environment.

The watch or timepiece of the invention has therefore the features of one or more of the appended claims.

In a first aspect of the invention the back-and-forth movement is a rotational back-and-forth movement.

The ease of oscillation of the mass is promoted when the mass has a center of rotation which differs from the center of the frame (coinciding with the center of the watch) from which the mass is suspended.

The invention will hereinafter be further elucidated with reference to the drawing pertaining to an exemplary embodiment of the energy harvester of the invention, which is not limiting as to the appended claims.

In the drawing:

- figure 1 shows schematically the contours of a watch or timepiece ;

- figure 2 shows a basic construction of an energy harvester of the invention;

- figure 3 and figure 4 shows the energy harvester of figure 2 wherein the mass has moved to the left and to the right, respectively; and

- figure 5 shows a basic construction of prominent features of the watch or timepiece of the invention.

Whenever in the figures the same reference numerals are applied, these numerals refer to the same parts.

First reference is made to figure 2 which shows a mass 3 comprised in the watch or timepiece of the invention, which mass 3 is subjectable to environmental forces for bringing it into the status of a moving mass. For this purpose the mass 3 is part of a system comprising a frame 4 and at least a first elastic beam 6 and a second elastic beam 7 to suspend the mass 3 from the frame 4. The first elastic beam 6 and the second elastic beam 7 are both provided with a positive stiffness, and the mass 3 is suspended from the frame 4 through said first elastic beam 6 and second elastic beam 7, and enabling the mass 3 to carry out a rotational back-and- forth movement while being suspended from the frame 4. Figure 3 shows the situation wherein the mass 3 is moved out of its neutral position of figure 1 to the left, and figure 4 shows the situation wherein the mass 3 is moved out of its neutral position of figure 1 to the right.

Figure 5 again shows interior features of the watch 1 of the invention comprising a wheel 2 (preferably a ratchet wheel) and a mass 3 that drives the wheel 2. The mass 3 is subjectable to environmental forces which make the mass 3 move, in particular to oscillate back-and-forth . The mass 3 is part of a system comprising a frame 4 and at least a first elastic beam 6 suspending the mass 3 from the frame 4. In the shown embodiment not only the first elastic beam 6 but also a second elastic beam 7 is used to suspend the mass 3 from the frame 4, but this is an option. It suffices when at least one elastic beam suspends the mass 3 from the frame 4.

When as shown two elastic beams 6, 7 are used to suspend the mass 3 from the frame 4, it is preferred that the first elastic beam 6 and the second elastic beam 7 are both provided with a positive stiffness, and that the mass 3 is suspended from the frame 4 through said first elastic beam 6 and the second elastic beam 7, and to arrange that the mass 3 can carry out a rotational back-and-forth movement while being suspended from the frame 4.

It is further preferred that the mass 3 has a center of rotation 10 which differs from the center 11 of the frame 4 from which the mass 3 is suspended. This promotes the ease of oscillation of the mass 3 around its center of rotation 10.

As figure 5 shows, the (ratchet) wheel 2 is driven using intermediate flexures 8, 9 that are connected to the moving mass 3. In the shown embodiment the wheel 2 will turn clockwise by the operation of flexure 9 when the moving mass 3 is deflected from its neutral position to the left. Likewise, operation of the flexure 8 causes a clockwise rotation of the wheel 2 when the moving mass 3 is moved from its deflected position on the right towards its neutral position.

Although the invention has been discussed in the foregoing with reference to an exemplary embodiment of the Watch or timepiece of the invention, the invention is not restricted to this particular embodiment which can be varied in many ways without departing from the invention. The discussed exemplary embodiment shall therefore not be used to construe the appended claims strictly in accordance therewith. On the contrary the embodiment is merely intended to explain the wording of the appended claims without intent to limit the claims to this exemplary embodiment. The scope of protection of the invention shall therefore be construed in accordance with the appended claims only, wherein a possible ambiguity in the wording of the claims shall be resolved using this exemplary embodiment.