FR2505432A1 - VIBRATION SHOCK ABSORBER AND DAMPING SPRING USED IN THIS SHOCK ABSORBER - Google Patents

Abstract

A. VIBRATION DAMPER FOR VIBRATING MECHANICAL BODY. B. SHOCK ABSORBER CHARACTERIZED IN THAT IT INCLUDES A SUPPORT 2 ALLOWING TO MANIPULATE A VIBRATING BODY 1, A RIGID CYLINDRICAL HANDLE 3 MOUNTED ON THE SUPPORT 2 AND A PAIR OF CUSHIONING SPRINGS 4 ARRANGED BETWEEN THE SUPPORT 2 AND THE HANDLE 3, EACH SPRING 4 INCLUDING AT LEAST A SMALL PART 5 AND A LARGE PART 6 HELICAL CONNECTED BY A CONICAL HELICAL PART 4, THE SMALL PART 5 BEING FIXED TO THE SUPPORT 2 AND THE LARGE PART 6 TO THE INNER SURFACE OF THE HANDLE 3, WHICH ALLOWS TO ABSORB THE VIBRATIONS TRANSMITTED BETWEEN THE VIBRATING BODY 1 AND THE HANDLE 3. C. THE INVENTION APPLIES TO CHAINSAWS, MOWERS, MOTORCYCLES OR OTHER VIBRATING BODIES.

Description

The invention relates to a vibration damper

  tions and more specifically a vibration damper for

  handle or handlebar of a machine, vehicle or other beha-

  as a source of vibration such as a chainsaw or a motorcycle.

  The manual control support of a section

  chainsaw, motorcycle, lawn mower or other appliance

  vibration generator, is usually equipped with a

  As a result, the vibrations of the source are transmitted directly to the support and the handle, causing the user's hand or hands to vibrate often so violently that this could be harmful to your health For example, the vibrations of chainsaws used for cutting operations, are very often responsible, as is well known, disorders Reynaud Various attempts have been made so far to isolate the vibrations of chainsaws ,

  motorcycles and other sources of similar vibrations, from

  to protect the human body However, these various

  have so far failed to produce satisfactory solutions

sn = your.

  The main purpose of the invention is therefore to

  link the above disadvantages by creating a damper of

  vibrations for handles or handlebars of chainsaws, motorcycles

  cyclettes and other vibration-generating bodies, so as to protect the users against the Reynaud and

  other adverse effects on health.

  Specifically, the vibration damper

  according to the invention, uses a spring device of

  to connect the handle or handlebars to the body.

  mechanical vibrations generator This damper allows

  absorb or virtually completely absorb the vibra-

  which would otherwise be transmitted between the source of

  brations and the user, via the handle

or handlebars.

  For this purpose, the invention relates to an amortization

  vibration generator for vibrating mechanical body, such as a

  chain saw, lawn mower, motorcycle or

  weaver characterized in that it comprises a support such as a handle for manipulating the vibrating body, a handle 2.-

  rigid cylindrical mount on this support, and a pair of

  vibration damping spells disposed between the support and the handle or adjacent opposite ends of the handle, each spring comprising at least a small helical portion, at least a large helical portion, and at least one conical helical portion connecting the small helicoidal portion to large, the small helical portion being

  fixed or in contact with the support, and the great part

  coldale being fixed or in contact with the inner surface of the handle, whereby the vibrations transmitted between the vibrating body and the support are absorbed or damped by

  vibration damping springs so as to eliminate

  to reduce or significantly reduce the transmission of vibra-

to the handle.

  The invention will be described in detail by means of the accompanying drawings, in which: FIG. 1 is a perspective view of a

  chain saw using a vibration damper according to the in-

vention,

  FIG. 2 is a sectional view of a shock absorber

  3 is a sectional view along the line II of FIG. 2, FIG. 4 is a sectional view of another vibration damper according to the invention, FIG. sectional view along the line II-II of Figure 4, Figure 6 is a sectional view of another embodiment of the invention, Figure 7 is a sectional view along line III-III of the FIG. 6, the figure still forms the embodiment of line IV-IV of FIG. 8, the figure still forms the line VV of FIG. 10, FIG. 8 is a view of the invention, 9 is a sectional view of another section according to a sectional view of another of the invention, 11 is a sectional view along the 12 is a sectional view of another 3.- still form of embodiment of FIG. 13 is a sectional view along the line VI-VI of FIG. 12, FIG. 14 is a sectional view of still another embodiment of the invention. FIG. 15 is a sectional view along line VII-VII of FIG. 14, FIG. 16 is a sectional view along line VIII-VIII of FIG. 14, FIG. 17 is a sectional view of FIG. Yet another embodiment of the invention, Figures 18 and 19 are sectional views along the respective lines IX-IX and XX of Figure 17, Figure 20 is a sectional view of yet another form of embodiment of the invention, Figure 21 is a sectional view along the line XI-XI of Figure 20, Figure 22 is a sectional view along the line XII-XII of Figure 20, Figure 23 is a view in section describing the arrangement of the elastic bodies, Fig. 24 is a sectional view of still another embodiment of the invention, Fig. 25 is a sectional view of yet another embodiment of the invention. Figures 26 and 27 are sectional views

  according to the respective lines XIII-XIII and XIV-XIV of the

  Fig. 28 is a perspective view of a

  chainsaw in which vibration dampers are used.

  FIG. 29 is a sectional view of still another embodiment of the invention; FIGS. 30 and 31 are cross-sectional views taken along the respective lines XVXV and XVI- XVI of Figure 29, Figure 32 is a sectional view of yet another embodiment of the invention Figures 33 and 34 are sectional views along the respective lines XVII-XVII and XVIIIXVIII of Figure 32, FIG. 35 is a sectional view of still another embodiment of the invention; FIGS. 36 and 37 are sectional views along the respective lines XIX-XIX of FIG. 359; FIG. Sectional view of another embodiment of the invention, Figures 39 and 40 are sectional views along the respective lines XXI-XXI of Figure 38, Figure 41 is a sectional view of another form. embodiment of the invention, FIGS. 42 and 43 are sectional views along the lines respec XXII-XXIV of Fig. 41, Fig. 44 is a sectional view of yet another embodiment of the invention, Figs. 45 and 46 are sectional views.

  along the respective lines XV-XXV and XXVI-XXVI of the

  Figure 44 is a sectional view of still another embodiment of the invention; Figures 48 and 49 are sectional views taken along the respective lines XXVII-XXVII and XXVIII-XXVIII of Figure 47; FIG. 50 is a perspective view of a chainsaw using the embodiments of FIGS.

29 to 49,

  Fig. 51 is a perspective view of a chain saw using the embodiments of the figures

52 to 58,

  FIG. 52 is an enlarged view of part B of FIG. 51, FIG. 53 is a sectional view along line XXIX-XXIX of FIG. 52,

  Fig. 54 is an enlarged view of the

  FIG. 55 is a sectional view along line MXX-XXX of FIG. 54, FIG. 56 is a perspective view of still another embodiment of the invention, FIG. is an enlarged view in section 5.- of part D of FIG. 56,

  Figure 58 is a sectional view of Figure.

  Fig. 59 is a perspective view of a mower using the vibration damper according to the invention, Fig. 60 is an enlarged sectional view of part X of Fig. 59, Fig. 61 is a view. in section along the line XXXII-XXXII of Figure 60 # Figure 62 is a perspective view of yet another embodiment of the invention, Figure 63 is an enlarged view in section of the portion P of the figure 62, Fig. 64 is a sectional view along the line TXXIIXXXIII of Fig. 63, Fig. 65 is an end view of a spring form used in the invention;

  Fig. 66 is an elevational view of the

  FIG. 67 is a sectional view along the line XXXIV-XXXIV of FIG. 65, FIG. 68 is an end view of another embodiment of the spring, FIG.

  Fig. 69 is an elevational view of the res-

  FIG. 70 is a sectional view of the spring of FIG. 68, FIG. 71 is a perspective view of a

  chain saw using the vibration damper according to the in-

vention,

  Fig. 72 is an enlarged view of the

  FIG. 719, FIGS. 73 and 74 are cross-sectional views

  following the respective lines XXXVI-XXXVI and XXXVII-XXXVII.

  The vibration damper according to the invention comprises a support element such as an arm carrying a

  body generating mechanical vibrations, a cylindrical element

  that rigid handle or concentric handlebar support, this element being intended to be held in the hand by the operator for manipulations of the device, and a pair of 6.- helical spring mounted between the support and the handle The pair helical springs are located near the ends

  opposite of the rigid cylindrical handle -

  Each spring consists of at least one

  a helical part, at least a large part of the helicolda. and at least one conical helix portion connecting the two portions above Each small helical portion is fixed or in contact with the outer periphery of the support and each

  helicoidal part is fixed or in contact with the sur-

  inner face of the rigid cylindrical handle, this handle can be metal, hard rubber or metal covered with

hard or soft rubber.

  In some embodiments, a body

  such as rubber, an elastomeric body or a

  fate, is inserted between the inner surface of the handle and the large helical part of the pair of springs and / or between

  the outer surface of the support and the small helicolda-

  the pair of springs, to improve the cushioning effect

  According to the invention, in other embodiments, the pair of coil springs are embedded in an elastic body such as

  rubber or an elastomeric plastic material to

  force the damping effect of the shock absorber vibrations

according to the invention.

  Each spring can be fixed to the support by means of an internal radial projection, or axial, formed to

  the free end of the small helical part, and a

  or an attachment device provided in the support for

  receive the projection We can fix each spring at the po-

  generated by forming an external radial or axial projection,

  at the free end of the large helical part, and a

  or a catching device in the handle, to receive

see the projection above.

  The vibration damper according to the invention makes it possible to considerably reduce the vibrations both in

  radial direction (vertical) only in the axial (horizontal) direction.

  The theoretical aspect is not perfectly clear but we were able to

  that it was essential, to obtain depreciation

  that the handle is constituted by a rigid cylindrical body and is supported by springs having a part 7.-

  median wound helically on a conical surface.

  Also, it was sufficient that a single pair of springs as above, housed near the two ends of the rigid cylindrical handle and inserted between the handle and the support, to obtain the objecti% target. FIG. 1 shows a chain saw intended to use the vibration damper according to the invention. The housing 1 is intended to receive the motor device called

  hereinafter vibrating body because it constitutes the source of vibrations.

  In the present embodiment, the chainsaw blade

  is an endless chain 28 The vibrating body 1 comprises a sup-

  port 2 such as an arm to be held by the operator

  handle 3 is sleeved on the upper part of the support 2.

  The vibration damper according to the invention relates to the structure

  connecting together the support 2 and the handle 3.

  In all the figures that follow, the same

  references refer to the same elements or parts.

  Figures 2 to 13 illustrate different

  my realization of vibration dampers intended to be

  used in the chainsaw of Figure 1 In these buffers

  a pair of coil springs 4 are arranged between

  the support 2 and the rigid cylindrical sleeve 3 mounted concentra-

on the support 2.

  Each of the springs 4 of each of the forms of

  FIGS. 2 to 13, except those of the forms shown in FIGS.

  6 and 7, consists of two small helicoidal parts, a large helical part 6 and two conical helical parts 4 'connecting the small parts 5 to the large one.

  Part 6 These coil springs 4 are arranged at both ends.

  the inner parts of the handle 3 the inner surfaces 7 of the small helicoidal parts 5 fit in a fixed manner on the surface

  8 of the support 2 and the outer surface 9 of the

  of helical part fits fixedly on the inner surface

  10 of the cylindrical handle 3.

  The embodiment illustrated in the figures

  res 6 and 7 is substantially identical to the others, except that the springs 4 use two large helical parts

  6 and a single small helical portion 5.

  The helix angle of the conical helical portion

  that 4 'must be greater than 180 (1/2 turn) to give an 8.-

  effective damping A helix angle of 3600 (1 round

  plet) of the helical portion 4 ', is illustrated in FIGS. 2, 3, 6, 7, 8, 9, 10, 11, 12, 13 and a helix angle of 7200

  (two turns) is illustrated in Figures 4 and 5.

  The rigid handle is constituted by a metal cylinder 11 'and a rubber sleeve 11 (Figures 2 to 99 12 and 13), or by a single metal cylinder 11 (Figures and 11) The springs 4 are fixed in place by gluing , by brazing or by fastening elements, such as 12 (FIGS.

8, 10).

  The vibrations transmitted by the support between the vibrating body and the handle, are considerably

  reduced or amortized in these forms by

  of the conical helical part 4 'of the springs 4 with

the mass of the rigid handle 3.

  In the embodiments illustrated on

  Figures 14 to 28, the vibration dampers are used

  between the support or handle 2 and the handle 3 of a section

  In each embodiment of these figures, the handle 3 is a metal cylinder, although this handle may include an inner metal cylinder and an outer rubber sleeve,

  The pairs of springs 4 inserted between the support 2 and the handle

  3, consist of two small outer helical parts 5, a large inner helical part 6 and two conical helical parts 4 'connecting the parts and 6. Annular or cylindrical elastic bodies 13 of rubber or elastomeric material reinforcing the damping effect of the vibration damper, are inserted and fixed in place between the inner surface of the handle 3 and the outer periphery of the support and / or between the support 2 and the inner surface of the small helicoidal portions 5 and

  large helical parts 6 of the spring 4 The elastic bodies

  ring ticks 13 are inserted between the handle 3 and the

  springs 4 (FIGS. 14 to 16) or between the support 2 and the

  spells 4 (FIGS. 17 to 19) or in both places (FIGS. 22) Instead of annular elastic bodies 13, such as those illustrated diagrammatically in FIG. 23, these bodies 13 can be divided into segments separated by gaps 14, 9.-

  as shown in Figure 24 can also be used

  elastic bodies 13, helical springs

  As shown in FIGS. 25 to 27, springs 4 and handle 3 are inserted between the outer periphery, a metal cylinder 15 and helical springs 13 consisting of

  helical parts 5 ', 5' and of a large part heli

6 'coidale attached to the cylinder 15.

  In the embodiments above, the

  vibrations are first absorbed or damped by the

  spells 4 and then the remaining vibrations are absorbed by the

  elastic bodies 13 which thus enhance the cushioning effect

vibrations.

  Figures 29 to 50 illustrate forms of

  vibration mortars for use with a chain saw as in Fig. 50, and comprising

  one or more elastic bodies 13 serving as auxiliary means

  The elastic bodies 13 of rubber or of elastomeric material fill the annular gap between the support 2 and the handle 3 which, in

  these embodiments, comprises an inner cylinder metal-

  It and an outer rubber sleeve 11 The elastic bodies can be held in any position

desired axial.

  In FIGS. 29 to 319 a pair of bodies

  elastics 13 are obtained by molding the outer ends

  FIGS. 32 to 34 show the resilient bodies 13 of the springs 4 so that a part of the springs 4 is thus embedded in the elastic bodies. The resilient bodies 13 fill the gap between the handle 3 and the

  support 2 at the large helical parts of the

  Spells, so that the medial parts of the springs are embedded in the elastic bodies 13 In Figures 35 to 37, all the springs 4 is embedded in the elastic bodies 13 In Figures 38 to 40, the elastic bodies are inserted

  between the handle 3 and the outer periphery of the springs 4.

  Figures 41 to 43 are similar to the figure except that each of the pairs of coil springs 4 has a small helical portion 5, a large helical portion 6 and a conical helical portion 4 'connecting the portions 5 and 6 in Figs. 44 at 46, the elastic body 13 is inserted at the mid-point between the pair of springs 4. In FIGS. 47 to 49, the elastic body 13 fills the entire gap between the support 2 and the handle 3.

  advantages presented by these embodiments are similar

  to those presented by the embodiments of the figures

14 to 28.

  Figures 51 to 58 illustrate a form of

  The chain saw is equipped with two supports 2 and 16 on which the handles 3 (three B-handles and one C-handle) are mounted, the vibrations being absorbed or damped by the vibration damper inserted between the support 2 and

  the handles 3, or between the support 16 and the handle 3.

  In FIGS. 52 and 53 which are enlarged and sectional views of part B of FIG.

  identical vibration dampers are mounted on the sup-

  curved port 2 The construction of each shock absorber is exact-

  the same as in Figures 2 and 3, except that

  outer ends of the pair of springs 4 are now

  naked by retaining rings 12 housed in annular grooves

nulars around the support 2.

  Figures 54 and 55 are enlarged views and

  in section C of Figure 53 The construction of the

  The vibration mortiser is exactly the same as that of FIGS. 53 and 54. In this embodiment, a plurality of vibration dampers are used to be held in hand in different angular positions, thereby allowing

  to easily handle the chain saw while getting a good

  proper vibration.

  FIGS. 56 to 57 illustrate a variant of the embodiment of FIGS. 51 to 55. In this variant, the support 2 corresponding to the position B of FIG. 51, is provided with two handles 3 instead of three, as indicated in FIG. in FIG. 56 Each vibration damper comprising the springs 4 and the handle 3 is of substantially construction

  identical to that of Figures 51 to 56.

  Figures 59 to 61 show an embodiment applying to a mower This mower includes

  a power source 1, a handle or support 2, 2 ', in the

  which passes a means of transmission, and a saw 17 connected to

  transmission means A pair of handles 3, 3 'provided with

  vibration mortizers according to the invention are mounted on the support 2, 2 ', the figures 60 and 61 are sectional views,

  on a larger scale, vibration dampers

  exactly the same construction as the shock absorbers

Figures 52 to 54.

  Figures 62 to 64 illustrate another embodiment applying to a mower This mower is provided with a handle or support 2 ', and another small handle or perpendicular support 2 ", handles 3 being mounted on these two supports 2 'and 2 "with the interposition of vibration dampers according to the invention As shown in the figures

  63 and 64, each vibration damper consisting of

  spells 4 and a handle 3, is of substantially construction

  identical to that of Figures 51 to 56.

  Figures 65 to 67 illustrate another form

  further embodiment of the invention, applying to a

  such as that shown in Figure 71.

  spells 4 used in this embodiment may have

  the structure of FIGS. 65 to 67 or that of FIGS. 68 to 70.

  In FIGS. 65 to 679 the spring 4 comprises a small helicoidal portion 5 r a large helical portion 6 and a

  conical helical part 4 'connecting parts 5 and 6 The former

  inner tremity of the small helical portion 5 is provided with a short radial projection 5 ', and the outer end

  of the large helical part 6 is provided with a short

  radial projection 6 ', these projections being selected respectively

  in a cavity 18 of the support 2 and in a hole 18 'of the

  handle 3, as shown in FIGS. 72 to 74.

  An alternative structure of the spring 4 is

  In these figures, the spring differs from that of FIGS. 65 to 67 only in the fact that

  the projections 5 'and 6' are axial instead of radial.

  The projections 5 'and 6' are retained by means of cro-

  chets (not shown) respectively attached to support 2 and

the handle 3.

  In an alternative embodiment of the invention

  the vibration damping spring, in horizontal position

  tale, can, for example, include an eccentric axis, so

  the spring is shifted upwards.

12.-

Claims (8)

R E V E N D I C A T IO N S   1. Vibration damper for mechanical body   vibrating plate (1), such as a chainsaw, a lawn mower, a   motorcycle or the like, a shock absorber characterized in that   takes a support (2) such as a handle for manipulating the vibrating body (1), a rigid cylindrical handle (3) mounted on the support (2) and a pair of vibration damping springs (4) disposed between the support (2) and the handle (3) or in the vicinity of opposite ends of the handle, each spring (4) comprising at least a small helicoidal portion (5), at least a large helical portion (6) and at least one conical helical portion (4 ') connecting the small helical portion (5) to the large (6), the small helical portion (5) being fixed or in contact with the support (2) and the large helical portion being fixed or in contact with the surface   inside the handle (3), whereby the trans-   placed between the vibrating body (1) and the support (2) are absorbed   or depreciated by the damping springs (4) of the   in order to eliminate or reduce considerably   the transmission of vibrations to the handle (3).   2. Damper according to claim 1, characterized   characterized in that an elastic body (13) for damping the   brations, such as rubber, elastomeric material or   spring, is inserted between the inner surface of the cylindrical body   (3) and the large helical part (6) of the spring of vibration death.   3. Shock absorber according to any one of the   Claims 1 and 2, characterized in that an elastic vibration-damping body (13), such as rubber, elastomeric material or spring, is inserted between the outer periphery of the support (2) and the small helicoidal part. (5)   vibration damping spring.   4. Shock absorber according to any one of the   Claims 1 to 3, characterized in that an elastic body (13) damping vibrations, such as rubber or a material   elastomer, is inserted between the inner surface of the   (3) and the support (2), so as to fill the gap between this surface and the support, according to a part   at least the axial length of this handle.   Shock absorber according to any one of the 13 2505432   13.- Claims 1 to 4, characterized in that the vibration damping spring Idal (4) is provided at one or both ends with a projection (5 ', 6 ') intended to be retained by the support (2) and / or the corresponding handle (3).   6. Vibration damping spring of-   designed to be used in a shock absorber according to any one   Claims 1 to 5, and to be inserted between a support (2)   vibrating body and a rigid cylindrical handle (3), spring (4) characterized in that it comprises at least a small helicoidal portion (5) and at least a large helical portion (6), and at least one conical helical portion (4 ') between   the small helicoidal part and the big one.   7. Damping spring according to the claim   6, characterized in that it is provided at one of its ends with   or at both ends of a projection (5 ', 6') of   designed to be retained by a support (2) and / or a handle (3) corresponding.   8. Damping spring according to any one   claims 6 and 7, characterized in that its axis is eccentric.