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1. (WO1979000005) SYSTEME D"EMBRAYAGE ET DE FREIN PERFECTIONNE POUR TONDEUSE A GAZON ROTATIVE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

WHAT IS CLAIMED IS : "

1. A mechanism for a rotary power mower for releasing braking means while simultaneously transferring power from a clutch assembly which is driven by a rotative drive shaft to a cutting blade member, comprising:
a combined clutch cone cup and brake disc which is brought into gradual frictional engagement with a rotative clutch drum assembly and drive shaft, whereby said brake disc is released.

2. A mechanism for a rotary power mower for releasing braking means while simultaneously transferring power from a clutch assembly which is driven by a rotative drive shaft to a cutting blade member, comprising:
a clutch cone cup and brake disc assembly which is brought into gradual frictional engagement with a clutch and rotative drive shaft;
said brake disc forming a braking means which is gradually released and wherein a portion of the clutch cone forms a tapered conical flange.

3. A mechanism for a rotary power mower for releasing braking means while simultaneously transferring power having a clutch assembly which is driven by a rotative drive shaft to a cutting blade member and
a combined clutch cone cup and brake disc cooperating with a pivotable control lever which urges said clutch cone and brake disc assembly into gradual frictional engagement with the clutch drum assembly and rotative drive shaft while the brake disc is being released.

4. A brake clutch mechanism for a rotary power mower having a cutting blade member comprising:
connecting means to a drive shaft;
a clutch assembly and brake disc;
a pivotable control lever for said clutch assembly and brake disc;
said clutch assembly having a cylindrical drum and tapered cone of frictional material forming a cone clutch and a mating tapered metal clutch cone cup; and
braking means which simultaneously transfers power from the clutch assembly to the cutting blade member, wherein actuation of the pivotable control . lever urges the clutch assembly and brake disc into gradual frictional engagement and further wherein the tapered clutch cone produces a gradual acceleration in the cutting blade member.

5. The mechanism of claim 4 in which said clutch is further characterized as having a plurality of counterweighted flyweight clutch shoes pivotably mounted on' said brake disc outwardly of said clutch drum and also having metal frictional surfaces adapte to engage the clutch drum, thereby transferring power to the brake disc and to the cutting blade member.

6. The mechanism of claim 5 in which there is a clutch housing surrounding the flyweight clutch shoes

7. The mechanism of claim 5 in which the cylindri cal drum periphery is entirely of frictional material which is generally a poor heat conductor,
wherein the heat generated in said clutch pass outwardly through said clutch face and through said flyweight clutch shoes rather than inwardly toward said shaft.

*

8. The mechanism of claim 5 in which each of said counterweighted flyweight clutch shoes has an unlined toe portion and a weight portion, the toe being in
substantially curved direct sliding contact with the cylindrical clutch drum made of clutch facing material.

9. The mechanism of claim 7 in which the clutch
drum has a strong hub member which distributes the
forces concentrated at the engine shaft key over a
large area of the weaker clutch facing material, there- by minimizing stresses in the clutch facing material.

10. The mechanism of claim 7 in which the clutch
drum is keyed to the engine shaft and supported by a washer which is retained by a sleeve and pilot screw, the clamping forces produced by the pilot screw being transmitted to the drive shaft by said sleeve and not through the clutch drum or hub, thereby relieving the pilot screw of any of the torsional stresses transmitted by the clutch drum or hub which would tend to loosen the pilot screw.

11. The mechanism of claim 8 in which there are at least two securing means fastened to said clutch assembly and brake disc,
said flyweight clutch shoes being positioned
partially surrounding said securing means which act
as a fulcrum for said flyweight clutch shoes .

12. The mechanism of claim 4 in which there is a
brake pressure plate enclosing the brake disc and
connecting means between said control lever and said plate to actuate said plate,

said plate having an upturned flange outwardly thereof to strengthen the plate and to protect the brake disc from thrown debris.

13. The mechanism of claim 12 in which more than two symmetrically spaced projections which are part of and extend upwardly from the upturned flange of
the compression plate are engaged by springs which
raise the compression plate into a braking relation- ship with the brake disc when the release lever is no actuated,
the symmetrical spacing of the spring projectio providing equal release of the brake compression plat when the brake release lever is actuated.

14. The device of claim 4 in which the taper in th cone clutch is 15° so that wear is minimal and there is still adequate frictional force on the cone.

15. The mechanism of claim 4 in which a spring
housing surrounds and is in close proximity to the
drive shaft, whereby it provides momentary support
for the drive shaft when, as a result of the blade
impacting some solid object, the drive shaft is de- fleeted until contact with the spring housing occurs, thereby assisting in avoiding permanent set in the
drive shaft .

16. The mechanism of claim 5 in which the flyweight clutch shoes may be positioned in mirror image position to provide for a different cutout speed.

17. The mechanism of claim 8 wherein the friction material is sufficiently abrasive to insure the
clutch shoes will wear as fast or slightly faster
than the cylindrical drum, thereby maintaining maxi- mum area of contact between the two and minimizing
the wear of both.

18. The mechanism of claim 11 includes a clutch housing surrounding said shoes, wherein the securing means include a shoulder or sleeve which abuts the inside of the bottom of the clutch housing and ab- sorbs the clamp stresses produced by tightening the blade nuts, thereby preventing the distortion of the clutch housing or brake disc when the blade attaching nuts are tightened excessively.

19. The mechanism of claim 5 wherein a socket head cap screw used to retain the clutch assembly and cylindrical drum also serves as a pilot which centers the cutting blade member forming a pilot on the end of the drive shaft.

20. The mechanism of claim 6 wherein the combination brake disc and clutch .housing have locking lugs to prevent turning the housing under stress conditions, such as when the cutting blade member hits an object.

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