FR2639030A1 - CLOSING COVER FOR THE FILLING TUBING OF A FUEL TANK - Google Patents

Abstract

It is provided according to the invention that the closing cover of the fuel tank of machine tools with heat engine guided manually consists of two parts 1, 2 respectively forming a handle and closure which can be compared to each other as much rotate around a common axis 17 that slide axially. The parts 2, 1 respectively comprise drive projections 30; 31 having radial engagement surfaces 33, 34 which face each other in the "open" direction of rotation and extend, in the resting state of part 1, axially to approximately a plane of seal 35 perpendicular to the axis of rotation 17. The closing cover can only be unscrewed if, in addition to a rotational movement, part 1 is also displaced axially in the direction of part 2.

Description

Closing cover for the filler neck of a tank

  The present invention relates to a closure cover for the filler neck of a fuel tank, consisting of a handle portion and a closure portion, which can be rotated relative to each other around a common axis and engage via drive projections into one another in order to open and close the filling pipe. Closure covers for the tubing

  filling a fuel tank are universal-

  well known. It is thus provided in the field of vehicles

  automobiles closing covers which are con-

  formed by a handle part and a form part

  mant closure. In a locked position the handle portion and the closure portion can be

  turned relative to each other around an axis

  mun, while in an unlocked position the

  handle tie and the closing part engages

  gent via drive projections one

  ? C in the other to open or close the filling tubing

  wise. Closable covers of this kind are generally commonly used.

  used in the field of motor vehicles.

  In motor-driven machine tools

  thermal, in particular manual guided machine tools

  The use of such tank covers

  likely to be closed is disadvantageous for reasons

  sounds both price and weight. This is why it is intended for machine tools driven by an internal combustion engine,

  such as chain saws, chainsaws,

  grinding wheels and the like, simple closing lids which can be easily manufactured and are by

  therefore inexpensive and of low weight. For these cou-

  tank locks there is however the risk of being accidentally loosened. This has the consequence that fuel can flow from the tank, which involves a

serious risk of fire.

  The object of the present invention is to provide a closure cover for the filler neck of a fuel tank in such a way that untimely loosening of the closure cover is avoided and that the latter nevertheless has a simple construction and a

low weight.

  This object is achieved according to the invention, with regard to

  relates to a closure cover for the delivery tubing

  pleating of a fuel tank, consisting of a handle part and a closure part,

  which can be rotated relative to each other

  be around a common axis and engage through

  re drive projections into each other for or

  screw or close the filler neck, by the fact that the handle part is retained on the part forming

  closing so that it can slide axially in relation

  port to the axis of rotation, that between the part forming poi-

  and the closing part is mounted a spring which keeps the handle part, in a predetermined rest position, at a certain distance from the part

  forming a closure, that the handle portion and the

  tie forming closure bear on their opposite faces each at least one axially projecting drive projection, and that the drive projections have in the direction of rotation "open" facing radial engagement surfaces which in the position of rest of

  the handle portion extend axially sensitive-

  up to a fictitious joint plane which is arranged per-

  C pendicular to the axis of rotation.

  A loosening of the closure cover is only possible if it is brought axially closer to the closure part and at the same time is turned in the loosening direction. It is practically excluded that such a combined movement is accidentally applied to the cover

closing.

  According to an advantageous embodiment of the invention the aforementioned spring is a membrane spring

  arranged coaxially with the axis of rotation. The spring pre-

  C advantageously feels a cylindrical connection core located coaxially with the axis of rotation and which extends in the direction of the part facing it of the cover of

  closing, the head of the connection core being preferably

  rence, as part of a snap closure, encas-

  very captive but with freedom of rotation in

  a housing provided in the facing portion of the cover.

  The head of the connection core and the housing

  associated are advantageously made in a bom-

  open. The spring is advantageously made in one piece with the part forming a closure and preferably covers,

  as a central portion of the closure portion-

re, the filler neck.

  The interval between the handle portion and the

  the closing part is advantageously closed

  dustproof era. To this end, the handle part preferably engages in the form of a pot on the closure part, a lip seal fitted between the wall of the handle part.

  engaging around the wall of the closing part

  ture and this last wall thus surrounded being preferably

  made in one piece, in particular with part of the

  cover, preferably the closure portion.

  According to another characteristic of the invention, the

  free edge of the wall of the handle portion engages

  giant around the wall of the closure part has an internal stop which cooperates with the lining

  sealing lip so as to limit its displacement.

  The drive projections are advantageously provided as radial drive bars having engagement surfaces arranged in the peripheral direction, a number of these drive projections 2C preferably being distributed uniformly in the peripheral direction on the mutually opposite faces of the two constituent parts of the closure cover.

  In an advantageous embodiment of the invention,

  However, it is expected that a driving projection

  ment of each pair of drive projections makes sail-

  links axially beyond the fictitious joint plane and forms an oblique plane which follows the engagement surface

  acting in the 'open' direction of rotation, and that the

  facing faces in the direction of rotation close "overlap axially in the axial rest position of the handle portion. In this form of

  realization the drive projections have before-

  axially the same height. When the handle portion is rotated without being pushed down, the drive projection of each pair of drive projections engages obliquely and lifts the handle portion against the force of the spring. Therefore, the drive projections cannot be put into force transmission without the handle portion being pushed down. The fact that the drive projections suddenly pass the

  These are indicated by a corresponding noise.

  According to another characteristic of the invention, the engagement surfaces arranged one opposite the other in the direction of rotation "close" are slightly inclined, in the direction of rotation "close", and this by a

  same angle. On the other hand, the pre-

  advantageously feel the same axial height. In addition, the constituent parts of the closure cover of the invention are advantageously molded by

  injection in synthetic material, the part forming firm

  with spring & diaphragm and connecting core

  central as well as the lip seal available

  located at the outer periphery being advantageously soft

  injected in one piece.

  The invention is explained in more detail below

  using an exemplary embodiment described in detail below

  below and shown in the accompanying drawings in which: Figure 1 is a sectional view of a cover

  closure according to the invention placed on the replacement tube

  pleating of a fuel tank; Figure 2 shows a section along line II-II of Figure 1; Figure 3 shows a section along line III-III of Figure 2; and Figure 4 is a top view of the cover of

closure according to the invention.

  The closure cover shown is constituted by an upper part 1 forming a handle and a part 2 forming a closure, which is screwed onto the filler neck 3 of a non-fuel tank.

  specially shown. To this end, the replacement tubing

  1C pleating 3 has an external thread 4 which cooperates

  with an internal thread 5 of part 2 forming a closure

  wandering around the filler neck. Between the edge 6 of the filling tube 3 and the portion 7 in the form of a cover of the part 2 forming a closure is provided a seal 8 in order to suddenly prevent any flow of liquid from the fuel tank. The seal 8 is a flat seal and is arranged in a corresponding annular groove formed

in part 2 forming a closure.

  2C In the center of part 2 forming a closure is mounted a membrane spring 10 which has an inner cylindrical connecting core 9, which extends from the filling tube 3 axially outward towards part 1 forming handle. The connection core 9 is hollow but has an internal partition 11 so that any passage of liquid or air

  through the connecting core 9 is excluded.

  The membrane spring 10 follows radially from the cover-shaped portion 7 of the part 2 forming 3C closure and is preferably made in one piece.

with it.

  Part 1 forming a handle produced in the form of

  pot or bucket engages around part 2 forming a

  ture in such a way that it is completely inside the handle part 1. The head 12 of the connection core 9, turned towards the part 1 forming a handle, is housed as a constitutive element of a

  snap closure in a housing 13 made accordingly

  quence in the central portion of part 1 forming poi-

  gnawed. Preferably, the head 12 of the connection core 9 iC as well as the housing 13 in the part 1 forming a handle

  are produced in a domed form.

  Due to the predetermined axial length of the connection core 9, the part 1 forming a handle is maintained, in the relaxed state of the membrane spring 10, in a position of rest relative to the part 2 forming a closure, position in which the face 14, facing

  part 1 forming a handle, part 2 forming a

  ture is located at a distance x from the inner face 15 of the part 1 forming a handle which is arranged opposite 2G of it. From this rest position shown on

  Figure 1 the part 1 forming a handle is axially movable

  alement, with respect to the part 2 forming a closure, in the direction of the double arrow 16. The part 1 forming

  handle can also be rotated around the axis of rotation

  tion 17 relative to part 2 forming a closure. For

  that the 12/13 click connection is made accordingly.

  The gap 18 formed between the part 1 forming

  handle and part 2 forming a closure is closed in a

  dustproof. To this end it is mounted between

  the wall 19 of the part 1 forming a handle engaging the

  around part 2 forming a closure and the wall 20, thus enclosed, of part 2 forming a closure

  sealing lip 21 which closes the slot between the sides

  kings 19 and 20. The sealing lip of the gasket

  sealing 21 extends radially outwards and downwards in the direction of the fuel tank and is preferably produced in one piece with the part 2 forming a closure. The free end of the sealing lip 21 presses tightly against the inner side

  of the outer wall 19 at which it cooperates

  furthermore with a stop 22 serving as a work limiter

  jet. Thus the axial stroke of part 1 forming a handle

  moving it away from part 2 forming a closure is limited.

  Drive projections 30, 31 made of

  preferably in the form of stretch bars

  tooth axially up to in the interval 18, as the

  trent Figures 2 and 3. The drive bars 30

  are mounted on the face 14 of the part 2 forming a closure

  re, while the drive bars 31 extend from the face 15 of the part 1 forming a handle in the gap 18. Each drive bar 30, 31 is produced in the form of a circular segment and divided, by

  partition grooves extending in the peri- direction

  spherical, respectively in portions 30a, 30b and 30c; 31a, 31b and 31c. The grooves are made there for reasons of weight reduction. The drive bars 30 of the part 2 forming a closure extend in the direction

  device over a greater length u than the barret-

  drive 31 of part 1 forming a handle (lon-

cheer v).

  As shown in Figure 3, the overhangs

  drag 30, 31 have engaging surfaces 33, 34 facing each other in the 'open' direction of rotation (arrow 23), which lie opposite in the peripheral direction and extend as radially as 'axially. In the rest position of the handle portion 1, determined by the spring c, the engagement surfaces extend axially

  up to about a common joint plane which is perpendicular to

  the axis of rotation 17. The engagement surfaces extend perpendicular to the imaginary joint plane 35; they are also part of a plane which contains the axis of rotation 17. The axial extent of the engagement surface 33 corresponds in this respect to the axial height of the drive bar 31. The axial height of the engagement surface 34 only extends to about the axial mid-height of the drive bar 30. At the joint plane 35 it follows the engagement surface 34 of the drive bar drive 30 an oblique plane 36 which ascends in the direction of rotation 23. The oblique plane

  made with the joint plane 35 at an angle preferably less

  I5 laughing at 45; advantageously, this angle is approximately 200.

  The axial height of the drive bar 30 corresponds to

  lays roughly to that of the drive bar 31.

  When the handle part 1 is turned

  in the direction of rotation "open" 23, this part 1 pre-

  2C sensing for this purpose axially projecting ears 25 & like a wing nut, the drive projection 31 engages with its axial end on the oblique plane 36 and lifts the part 1 forming a handle against

  the force of the spring & membrane 10. Thus the protrusion of

  undercarriage 31 passes over the drive bar.

  , without the part 2 forming a closure being driven.

  Once this passage over the drive bar has been completed, the handle portion 1 returns, under the action of the membrane spring 10, suddenly into the

rest position shown.

  If the cover portion is first moved

  created axially, against the force of the spring at mem-

  brane 10, in the direction of part 2 forming a closure, and is then turned in the direction of rotation 'open' 23, C then the engagement surfaces 33 and 34 join to establish a contact for transmission of driving force and the torque thus produced is transmitted to part 2 forming

  closing. The closing cover can thus be unscrewed.

  the filling line 3 of the fuel tank

rant not shown.

  The closing cover 1 cannot therefore be opened or

  green only by an axial displacement against the force of the spring 10 and a simultaneous rotation in the direction of 1C rotation 23. If the part 1 forming a closure is only turned, then the drive projections 31 of the part forming a handle pass over the drive projections of the closure portion, which is accompanied by a clicking.

  To close the tank, part 1 forming a poi-

  The ring is turned in the "close" direction of rotation 24, in order to bring the engagement surfaces 37 and 38 located on the other peripheral side of the drive bars 30 and 31 into engagement with each other. In this regard the engagement surface 37 extends, as already described for the engagement surface 33, over the entire axial height of the drive bar 31 to the joint plane

fictitious 35.

  The engagement surface 38 of the drive bar 30 extends beyond the imaginary joint plane

  over the entire axial height of the drive bar

  ment 30. Therefore, while the setting surface

  socket 34 located on a peripheral side of the power strip

  drag 30 extends only to the joint plane 35, the

  engagement surface 38 located on the other periphery side

  rique extends beyond this fictitious joint plane 35. The engagement surfaces 37 and 38 therefore overlap in the peripheral direction so that, without displacement out of a rest position, a closing torque can

  be exerted on part 2 forming a closure.

  In order to limit the closing torque to transmit-

  be from part 1 forming a handle to part 2 forming a closure, the engagement surfaces 37 and 38 are slightly inclined in the direction of rotation 'close' 24

and this from the same angle 39.

  To avoid having to perform, during a passage

  from the direction of rotation "open" 23 to the direction of rotation "close-

  1C mer "24, a too high no-load rotation around the axis of rotation 17 a certain number of drive projections 30, 31 are regularly distributed over

  the periphery of faces 14 and 15. In the example of a

  Lisation shown are mounted on each of these faces six drive projections so as to obtain six pasres

  of driving projections 30/31. In the example of reali-

  sation shown the idle rotation is approximately 25 ".

  Advantageously, the closure portion as well as the handle portion are made of synthetic material so that the closure portion can easily be manufactured in one piece so

  to integrate the lip seal 21, the

  membrane outlet 10 and connection core 9.

Claims (10)

  1 - Closing cover for the filling pipe of a fuel tank, consisting of a   part (1) forming a handle and a part (2) forming a   which can be rotated relative to each other about a common axis (17) and engage   with each other by means of overhangs   drag (30, 31) to open or close the manifold   filling (3), characterized in that the part (1) forms   IC mant handle is retained on the part (2) forming a closure   re so that it can slide axially with respect to   the axis of rotation (17), in that between the part (1) forms   mant handle and the part (2) forming a closure is mounted   a spring which in a predetermined rest position is   holds the handle part (1) at a certain distance   this (x) of the part (2) forming a closure, in that the   part (1) forming a handle and part (2) forming a   ture bear on their faces (14, 15) facing each other at   less an axially sailored drive projection (30, 31)   and that the drive projections have radial engagement surfaces (33, 34) which face one another in the "open" direction of rotation (23) and which in the rest position of the handle part (1) extend axially approximately up to a plane of   fictitious joint (35) which is perpendicular to the axis of rotation tion (17).   2 - closure cover according to claim 1, characterized in that the spring (10) is a membrane spring which is arranged coaxially with the axis of rotation (17).   3 - closure cover according to claim 1 or 2, characterized in that the spring (10) has a   cylindrical connecting core (9) which extends in a direction   1 3 tion of the upper part of the closure cover, the head (12) of the connection core (9) being, as part of a snap closure, embedded, so   captive and so as to be able to turn, in a box-   rment (13) located in the facing part forming a cover. 4 - closure cover according to claim   3, characterized in that the head (12) of the connection core   ment (9) and the associated housing (13) thereof are reali- sés in a domed form.   5 - Cover according to any one of the claims   previous cations, characterized in that the spring (10) is produced in a single picece with the part (2) forming a closure and preferably covers, as a central portion of the part (2) forming a closure, the tubing of filling (3).   6 - Closure cover according to any one   of the preceding claims, characterized in that the information   tervalle (18) between the part (1) forming a handle and the part (2) forming a closure is closed in a dustproof manner, the part (1) forming a handle engaging & for this purpose in the form of a pot around the part (2) forming   closure and a lip seal (21),   read in one piece, in particular with part of the neck   circle, preferably the part (2) forming a closure, being disposed between the wall (19) of the part (1) forming a handle engaging around the wall (20) of the part   (2) forming a closure and this wall (20) thus enclosed.   7 - closure cover according to claim   6, characterized in that the free edge of the surrounding wall   rante (19) of the part (1) forming a handle has a   inner stop (22) which cooperates with the seal   lip chew (21) as a path limiter.   8 - Closure cover according to any one   of the preceding claims, characterized in that the   drive projections (30, 31) are provided as radial drive bars having surfaces   engagement (33, 34, 37, 38) arranged in the direction   peripheral, a number of driving projections   ment (30, 31), preferably regularly distributed in the peripheral direction, being mounted on the faces (14,). iC 9 - Closure cover according to any one   of the preceding claims, characterized in that a   driving projection (30) of each pair of projections extends axially beyond the joint plane (35) and forms an oblique plane (36) following the engaging surface (34) acting in the direction "open" rotation (23)   and in that the engagement surfaces (37, 38) are made   sant face in the direction of rotation "close" (24) overlaps   axially in the axial rest position of the part (1) forming a handle.   10 - Closure cover according to any one   of the preceding claims, characterized in that the   engaging surfaces (37, 38) facing each other in the "close" direction of rotation (24) are slightly inclined, at the same angle (39), in the "close" direction of rotation (24).   11 - Closure cover according to any one   of the preceding claims, characterized in that the   drive projections (30, 31) have the same axial height.   12 - Closure cover according to any one   of the preceding claims, characterized in that the   part (1) forming a handle and part (2) forming a   ture are made of synthetic material.