FR2634156A3 - Saw blade for chain saw intended in particular for working concrete - Google Patents

Abstract

The blade guide 1 comprises lateral flanges 11, slide and guide rails 6 and a circulating chain 2 comprising cutting elements 3. The core of the chain guide 1 is fitted with cavities for supplying a coolant/lubricant to the chain 2. For protecting the chain 2 and better guiding the flows of refrigerant, an overlap element 9 is provided on each of the two faces of the blade guide 11. These overlap elements 9 are dismantleably fixed to the lateral flanges 11 using fastening means 18. The overlap elements 9 have a gap between them and the links 4, 5 with their cutting elements 3. … …

Description

2634 1S6

  The invention relates to a section blade

  neuse for chain saw intended for work of

  concrete, stones and masonry, including a guide

  blade and sliding and guide rails provided on the perimeter of the chain guide to guide the chain

  cutting, the chain cutting elements being available

  on the outside of the links in this chain.

  A chainsaw of this kind is known from the fact

  from DE-A-33 32 051 Ai. In this chainsaw, the guide-

  chain is hollow configuration and fitted with rails

  planks reported along the longitudinal sides

  narrow. The cavity of the guide bar serves as a re-

  refrigerant and, along the lateral surfaces of the attached rails, other lateral refrigerant conduits which lead to the exterior are arranged. The corresponding link chain is composed of rollers journalled on axes and which are connected to each other by guide and connecting elements. The rollers roll on the outer surface of the attached rails and the chain is returned to a chain wheel at the front end of the guide bar. On the chain links, which at the same time form guide elements, are attached diamond cutting inserts which serve as

  chopped off. These cutting inserts are arranged on the side

  outside tee of the chain links. As refrigerated-

  rant-lubricant, water is used which flows from the interior cavity of the guide bar towards the cutting inserts via coolant channels, and which

  clean the cutting line of shavings and dust

  re cutting that have formed. It is also known to replace the sliding and guide rails with

  rails of plastic or of other materials

  abrasion resistant. In this solution, the links of the chain do not have rollers but on the contrary, slide on the external surface of the

plastic rail.

  The known chain saws 3 which are

  Crites can very well be used to cut concrete or homogeneous stones, but there are difficulties when you have to cut in old walls or in mixed masonry, as well as in other similar building materials. These difficulties result from the fact that the links of the chain and the load-bearing elements, as well as the sliding and guide rails undergo very high wear and that these elements of the chainsaw have only very short service lives. This is due to the fact that

  free particles, sometimes quite large, of the ma-

  material to be cut, get caught between the cutting line and the circulating elements of the chainsaw and that fine-grained particles are insufficiently removed from the cutting line. When cutting sandstone, the chains of known chainsaws are destroyed or damaged as soon as

  that they cut an area of 1.5 to 2 m2. These courses

  your lifetimes are an obstacle to the use of

  chain saws for these materials in most cases, due to the high cost of replacing

damaged chains.

  The object of the present invention is to create a blade for a chain saw which makes it possible to cut difficult materials such as old walls, mixed walls and sandstone while preserving with the chain a

  sufficiently long service life which guarantees good-

  does not evacuate the particles torn from the cutting line and which does not entail any additional complication of

  mechanical construction of the blade.

  This problem is solved by the fact that on the lateral surfaces of the guide bar are arranged and fixed additional covering elements, that these covering elements are extended beyond the

  sliding rails and chain links, up to

  than on the base surface of the cutting elements and

26 341 56

  there remains a free interval between the circular links

  with the cutting elements of the chain on the one hand, and the covering elements on the other. A

  preferred embodiment of the invention is character-

  laughed at by the fact that the covering elements are

  constitues) ar back sheets or plates of plastic material

  that and in that the covering elements are of a thickness of 0.5 to 3 mm. According to another characteristic of the invention, the covering elements are made of a composite material which is formed of an epoxy resin reinforced with fibers. The fixing of the elements of

  the guide bar is covered with the blade

  particularly simple lesson with adhesive tape or

gripping tape.

  Compared to saw chainsaws

  lon the state of the art, the blade according to the invention has a substantially extended life. In the

  in the case of cutting sandstone, we reach lifetimes al-

  lant up to 50 m2 of cutting surface. At the same time, the lubricant coolant is much better guided and only very small quantities are lost when it flows from the guide bar cavity to the region of

  cutting elements passing through the refrigeration conduits

  rant and through the chain links. This improves

  re considerably the flow in the cutting line

  and, furthermore, the fact that the refrigerant flow-

  lubricant is positively guided outwards preventing

  che the trash particles from entering the mail-

  chain links. Since the covering elements

  really are only exposed to weak mechanical con

  nics, they can be made in a relati-

  thinly ,. There is no need to provide

  Darticular mechanical positions on the chain guide

  for their fixation. When using adhesive tapes

  cover sheets can be very loose

  cleverly removed and rinsed 'n place on the guide bar

  only when they have been damaged, or when they are not needed. The cover elements can also be dismountably mounted on the guide bar without

  difficulty using other mechanical fasteners

  what are known. The choice of the constituent material of the elements

  covering elements depends on the lubricating cutting fluid

  fiant used, as well as the material to be cut. In the case of old walls, stoneware or equivalent materials, it has proven useful to use water as a lubricating cutting fluid and this, combined with the use of an epoxy resin reinforced with fibers as a material. for covering elements, provides a solution

  economical and sustainable. The covering sheets fa-

  epoxy resin reinforced with fibers have a thickness of about 1 mm. Sheet thickness

  of recovery must be calculated according to the dimensions

  mechanical details or the width of the cutting elements

chain.

  Other features and advantages of the

  vention will be better understood on reading the description

  tion which will follow from an example of realization of the in-

  vention and with reference to the accompanying drawings on the-

which;

  Figure 1 is a cross section of the guide

  chain, taken transversely to its longitudinal axis

  nal; and Figure 2 is a partial detail of the guide region and the chain of the guide-catne, by a view

next to.

  The 1e according to FIG. 1 comprises a guide

  chain 1 and a chain 2 provided with cutting elements

  worn 3. The guide bar 1 includes, To simplify,

  the side plates 11, 12 and the frame 13 interposed in

  be these flasks. Inside the chain guide 1, there is a cavity from which Derçages 15 lead outwards. On the perimeter of the guide bar 1

2634 56

  sliding and quidaTe rails 6, 7 are arranged

  which are nested between the outer regions of the flas-

  lateral sides 11, 12. These sliding rails and which

  dage 6, 7 are made of a plastic material having particularly good sliding properties.

  In the sliding rails 6, 7, there are provided

  some spacings, holes 16 directed radially

  outwards and through which the refrigerant-

  lubricant is transmitted from cavity 14 to the external region

  lower of the guide bar 1 passing through the holes 15.

  Chain 2 is made up of links 4, 5 which are re-

  linked to each other by axes 8. The 4-link

  me a skate, this skate resting on the rails of

  sliding 6, 7. On either side of the shoe 4, are

  placed binoculars or chain links 5, 5 'which form

  guiding elements. These guide elements 5, 'are greater in height than the sliding element.

  ment 4 and fit laterally on the sliding rail-

  ment 6 or 7. The links 4, 5 are articulated to each other by the pins 8, so that the chain 2 Can be guided and returned around the guide bar 1. The cutting elements 3 are brazed on the links 4 who

  form skids and are made up of plates

  diamond ramics. In the example shown, we use

  are the usual commercial cutting inserts 3.

  In addition, cover elements 9 are arranged and fixed by removable links.

  against the side faces of the quide-chain 1. These elements

  covering elements 9, 10 are composed of sheets of an edoxy resin reinforced with glass fiber with a thickness of approximately 1 mm. The covering elements 9, 10 extend over all of the side surfaces

  from quide-chain 1, to the base surface of the elements

  cutting elements 3. Between the (1] covering elements 9, 10, on the one hand and the circulating links 4, 5 of the chain 2, with their cutting elements 3, on the other Dart,

  there remains a free interval 17. The lubricating water

  tion and cooling, which is brought to the chain by the hole 16, starting from the cavity 14, can

  flow outside passing through this li-

  bre and, in this movement, it is thus routed directly to the cutting elements 3. This stream of cooling and lubricating water which is directed towards

  the exterior also prevents foreign particles

  res cannot penetrate into the links 4, 5 of the chain and into the region of the sliding and guide rails 6, 7. This ensures very good protection of the links 4, 5 of the circulating chain and considerably increases the duration of life. It is in particular

  in the horizontal counes that the overlapping elements

  19 protect the links 4, 5 of the chain

  particles of masonry to be cut which infiltrate the

  literally in the chain 2 region or fall in this region. This prevents the links 4, 5 of the

  chain cannot rub against the surfaces

  the cutting line or the notch. The fixing of the covering elements 9, 10 is ensured in

  the example represented by double-sided adhesive tapes

  what 18 which are glued on the side flanges 11, 12

  and represent a separable bond.

  In Figure 2, a detail is shown

  tiel of the outer region of the guide bar 1, and one can better recognize here the different elements of the guide bar. On the lateral flange 11, is disposed, along the perimeter, the adhesive tape 18 which is coated with adhesive on its two faces. This ribbon therefore forms the

  connection between the lateral flange 12 and the retaining element

  covering 9. The pads 4 d_ the chain rest on the sliding rail 6, the chain 2 moving on the

  sliding surface 19 and also bearing on this-

  surface. Lateral guidance of chain 2 is ensured

  by the guide elements 5, 5 'which overlap side-

  on the sliding rail 6 and guarantee that

  you way a guide without play of the chain 2. The mail-

  lons 4, 5 of the chain are articulated to each other

  by the axes 8. The cooling and lubricating water

  tion which is routed through the inner cavity of the guide bar 1 flows through the holes 15 of the frame 13

  and the holes 16 of the sliding rail 6 for reaching

  dre the sliding surface 19 and, from there, it flows directly to the cutting elements 3 passing through the free intervals between juxtaposed links 4 of the chain. The covering element 9 then prevents the cooling and lubrication water from escaping

  towards the lateral flange 11 of the chain guide and thus ensures

  if optimal use of refrigerant flow.

  The damaged or worn covering elements 9 may

  wind be separated quite easily separated from the side flanges 11 and replaced by new elements. In this

  Indeed, the adhesive carried by the adhesive tape 18 is dura-

  very elastic and does not harden. In the case of tra-

  particularly difficult cutting valleys, in which

  the covering elements 9 are exposed to

  higher tracks, these elements are still assembled

  Wheat in addition to the side plates 11, according to

  removable links, by mechanical fixing means

what are known.

  Of course, various modifications may be made by those skilled in the art to the device which

  has just been described only by way of non-binding example

  mitative, without departing from the scope of the invention.

R EV E N D I C A T I O N S

  1. Chainsaw blade for chain saw intended for working with concrete, stones and masonry, comprising a chain guide and sliding and guide rails arranged on the perimeter of the chain guide to guide the cutting chain, the elements cutting chain being arranged on the outer side of the links of this chain, characterized in that, on the lateral surfaces of the chain guide (1),

  additional covering elements are arranged and fixed

  tional (9, 10), that these covering elements (9,) are extended. beyond the sliding rails (6, 7) and the links (4, 5) of the chain (2), up to the

  base surface of the cutting elements (3) and that it

  there is a free space (17) between the circulating links (4, 5), with the cutting elements (3) of the chain (2), on the one hand, and the covering elements (9,), on the other part, and this free interval (17) forms a

refrigerant pipe.

  2. Chainsaw blade according to claim 1, characterized in that the covering elements (9, 10) consist of sheets or plates of

plastic material.

  3. chainsaw blade according to claim

  1 or 2, characterized in that the covering elements

  ment (9, 10) are 0.5 to 3 mm thick.

  4. Chainsaw blade according to one of the claims

  1 to 3, characterized in that the retaining elements

  cover (9, 10) are made of a composite material

  f, - méée of an epoxy resin reinforced with fibers.

  5. Chainsaw blade according to one of the claims

  1 to 4, characterized in that the retaining elements

  cover (9, 10) are fixed to the chain guide (1) with

  of adhesive or gripping tape (18).