FR2633992A3 - FIXING ELEMENT FOR A PROPELLER ON A ROTATION SHAFT - Google Patents

Abstract

The invention relates to an element for fixing a propeller to a rotating shaft. According to the invention, a metal blade 9 is interposed on the surfaces of the geometric coupling 6, 7 of the motor shaft 5 and of the hub 4 and comprises: means for axially retaining the hub, a central part shaped for elastic interaction and elastic engagement and disengagement means of the element 9 with the transverse recess 13 of the motor shaft 5. This device makes it possible to limit the stresses acting on the shaft and to facilitate the assembly operations. and disassembly. It finds application in rotary basket machines, in particular, laundry drying machines.

Description

The invention relates to an element for the spring-loaded attachment of a

  ventilation fan on the corresponding rotating shaft in a basket dryer

rotary and for domestic use.

  In this type of machine, it is known to mount on the drive shaft of the laundry basket a pneumatic propeller for the air circuits for drying or cooling the machine as described in the British patent.

No. 1,470,620, for example.

  The connection of the rotation between the propeller

  generally made of plastic and the metal shaft

  of the rotor is usually done by coupling a

  arranged longitudinally in the hub of the propeller with a corresponding groove provided on the motor shaft, as described for example in the English patent

No. 1,363,120.

  To block the axial or angular displacements of

  the propeller are provided with hook-and-loop fasteners

  in the hub of the propeller and adapted to engage the transverse recesses of the motor shaft according to the

  description of the aforementioned English patent or the French patent

No. 2,243,362.

  It is known that, during drying, there is frequent reversal of the direction of rotation of the basket in order to prevent the laundry from being formed into balls that would carry

obstacle to the drying process.

  At the moment of the reversal of the direction of rotation of the basket, the hub of the propeller is subjected to stresses that can cause the deformation and, in some cases, the

break.

  Indeed, the reversal of the direction of rotation of the basket

  is usually achieved by deactivating the motor

  for a few moments in order to allow the basket to stop, after which the engine is restarted in

the opposite direction of rotation.

  The hub of the propeller is therefore solicited by a pair of opposing forces formed by the inertia

  of the propeller rotating in a direction of rotation and by the

  speed reductions to which it is subject by the - 2 -

  braking mass of the basket each time the engine of

flow is disabled.

  Another disadvantage of this type of coupling between

  propeller and motor shaft lies in the fragility of the

  snap fasteners in one piece in the

hub of the propeller.

  Indeed, during the assembly and de-

  the propeller assembly, during maintenance operations of the machine for example, it may happen that these devices are deteriorated to the point that the entire propeller is

put out of use.

  Therefore, the main object of the invention consists

  to make a coupling between the propeller and the rotational shaft

  This prevents any damage to the propeller during operation of the machine or during assembly and disassembly operations on the rotating shaft. Another object of the invention is to provide a

  which, irrespective of the specific characteristics

  allows for a simple and rational way of

  assembly and disassembly of the propeller ..

  These different objects are achieved according to the invention by means of a fastening element of a propeller on a shaft

  of rotation, in particular of spring-fixing of a

  lice whose hub has at least one longitudinal projection on the drive shaft of the basket of a machine

  drying domestic laundry, with a long groove

  tudinal suitable for coupling geometrically to the projection of the hub of the propeller and a transverse recess

  placed behind said groove and the end of the armature

  motor, characterized in that it consists of a single interposable metal blade geometric coupling surfaces of the motor shaft and the hub and comprising means for the axial retention of the hub of the propeller, a shaped central part for an elastic interaction between

  geometric coupling surfaces as well as means permitting

  putting the commitment and elastic disengagement of

  relative to the transverse recess of the motor shaft.

  The attached drawing, given by way of non-limiting example -3--

  will allow a better understanding of the characteristics of the invention

tion.

  Figure 1 is a side section of the propeller coupling

  2 and 3 are respectively a plan view and a plan view of the invention.

  a longitudinal section of the fastening element according to

to the invention.

  FIG. 1 represents an end of the rotational shaft

  5 of the electric motor of a clothes dryer

  basket type, not shown in the figure.

  The opposite end of the rotation shaft 5 is adapted to cooperate with known transmission means for the purpose

  to rotate the basket containing the laundry.

  In known manner, the end of the motor shaft 5 is provided with a longitudinal groove 6 (FIG.

  allow the coupling in form with a longitudinal protrusion

  corresponding dinal on the hub 4 of the helix 8, and a transverse recess 13 adapted to cooperate with the fastening element 9 according to the invention as described

below.

  According to the invention, the attachment of the helix 8 to the drive shaft 5 is effected by means of an element 9 (FIGS. 1 and 3) consisting of a metal blade (made of preferably harmonic steel) so as to have fins 10,11, folded upwards to engage the ends of the hub 4 of the helix 8 and a tab 12 folded downwards to engage spring the transverse recess 13 of

the motor shaft 5.

  More particularly, the fin 10 is obtained by

  folding the inner end of the element 9 upwards while the fins 11 and the tongue 12 are obtained

  by incisions and folding respectively

  along the lateral edges and in correspondence of the axis

longitudinal aspect of the element 9.

  Element 9 further comprises a central corrugated portion

  1 (Figures 1,3) between said fins 10 and 11, and a lever end 15 for disengagement

  elastic element 9 and propeller 8 with the shaft-

motor 5.

- 4 -

  The mounting operation of the propeller 8 provides that the

  element 9 is positioned in contact with the hub 4 of the propeller 8, as shown in FIG. 1, and that they are set together on the end of the motor shaft 5 until the commitment to spring of the tongue 12 between

  the transverse recess 13 of the drive shaft 5 (position indi-

shown in Figure 1).

  It should be noted that the corrugated central portion 14 of the element 9 will occupy a position such that it will advantageously dampen the opposing stresses to which the hub 4 of the propeller 8 is subjected during the turns.

  direction of rotation of the basket containing the laundry.

  In addition, the corrugated portion 14 allows elastic recovery of any tolerances or precision defects

  of working surfaces 6 and 7 which constitute the coupling

  geometry between motor shaft 5 and propeller 8 With this precaution is avoided damage to the hub 4 of the propeller 8 and the continuous contact of the geometric coupling surfaces (6,7) is ensured. The disassembly operation of the propeller 8 with the motor shaft 5 can be done

  in a simple way and without using any tools.

  Indeed, if one exercises on the lever end 15

  a slight upward pressure, the tab 12 of

  pledge of the transverse recess 13 which allows to slide the element 9 and the propeller 8 outside the motor shaft 5. As a result, it also avoids the disadvantage of traditional solutions of having to change the entire propeller in the case of detrimentations of spring fastening devices

  practiced in one piece in the hub of the propeller.

  The description shows that the objects of

  the invention to achieve a coupling between the propeller 8 and the rotation shaft 5 does not cause deterioration

  hub 4 whether during critical operating conditions

  during assembly operations

and disassembly of the propeller.

  The object aimed at simplifying and rationalizing

  both mating and

  separation between the helix 8 and the corresponding motor shaft 5.

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Claims (2)

  1. Fastening element of a propeller on a tree of rotation   tation, especially the spring-loaded propeller   the hub has at least one longitudinal projection on the shaft-   drive motor of the basket of a machine to dry linen   age, for domestic use, with a clean longitudinal groove   to geometrically mate with the projection of the hub of the heli   this, as well as a transverse recess placed behind this groove and the end of the motor shaft, characterized in that it consists of a single metal blade (9) interposable to the geometric coupling surfaces ( 6,7) of the drive shaft (5) and the hub (4) and comprising means (10,11) for axially retaining the hub (4) of the propeller (8), a central portion (14) shaped for elastic interaction between the geometric coupling surfaces (6, 7) and means (12) and (15) for respectively engaging and elastically disengaging the element (9) relative to   at the transverse recess (13) of the motor shaft (5).   2. Fastening element according to claim 1, characterized   characterized in that said axial retaining means of the   hub (4) of the propeller (8) consist of the end   upper (10) folded upwardly of the blade (9) and two fins incised along the lateral edges of the blade (9) and folded upwards, that said engagement means (12)   and elastic disengagement (15) of the transverse recess   sal (13) of the drive shaft (5) are constituted respectively by a tongue (12) incised and folded downwards along the longitudinal axis of the blade (9) and by the outer end (15). and folded up the blade (9)