CA2313753A1 - Saw - Google Patents

Saw Download PDF

Info

Publication number
CA2313753A1
CA2313753A1 CA 2313753 CA2313753A CA2313753A1 CA 2313753 A1 CA2313753 A1 CA 2313753A1 CA 2313753 CA2313753 CA 2313753 CA 2313753 A CA2313753 A CA 2313753A CA 2313753 A1 CA2313753 A1 CA 2313753A1
Authority
CA
Canada
Prior art keywords
blade
saw
protection member
blade protection
immersion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA 2313753
Other languages
French (fr)
Inventor
Marcus Gmeiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of CA2313753A1 publication Critical patent/CA2313753A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27BSAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B9/00Portable power-driven circular saws for manual operation
    • B27B9/02Arrangements for adjusting the cutting depth or the amount of tilting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27GACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Sawing (AREA)

Abstract

A saw including a saw head for receiving a saw blade, with the saw blade and displaceable in an immersion direction of the saw blade, a blade protection holder connected with the saw head, a blade protection member at least partially covering the saw blade and displaceable relative to the blade protection holder parallel to the blade immersion direction, with the blade protection member having a stop facing in the blade immersion direction and with a distance (L1) between a free end region of the blade protection member facing in the (L2) blade immersion direction and the stop corresponding at most to a distance between a mating surface of the blade protection holder facing in a direction opposite the blade immersion direction and the free end region of the blade protection member facing in the blade immersion direction, and elements for showing an immersion depth of the saw blade as the saw blade becomes immersed into a sawn component.

Description

FIELD OF THE INVENTION
The present invention relates to a saw including a base and a saw head for receiving a saw blade, connected with the base, and displaceable in the direction in which the saw blade is displaceable when being immersed into a to-be-cut component, the saw further includes a blade protection holder connected with the saw head and extending from the saw handle in a direction opposite the blade immersion direction, a blade protection member at least partially covering the saw blade and displaceable relative to the blade protection holder parallel to the blade io immersion direction, the blade protection member having a stop facing in the blade immersion direction. A distance between a free end region of the blade protection member facing in the blade immersion direction and the stop corresponding at most to a distance between a mating surface of the blade protection holder facing in the direction opposite the blade immersion direction and the free region of the blade protection member facing in the blade immersion direction.
BACKGROUND OF THE INVENTION
For sawing of hard stone, e.g., concrete, a saw, which include a base, a swivel arm, a saw head, a saw blade, a blade protection holder, and a blade 2o protection member, is known. The base has four rollers for supporting the base on guide rails and for displacing the base along the guide rails. The guide rails are supported on a to-be-sawn component by support members. The rollers formlockingly cooperate with the corresponding rail profile.

The swivel arm extends sidewise of the base and pivots about an axis extending parallel to the plane of the rollers that support the base on the guide rails.
A free end of the swivel arm is connected with the saw head to which the saw blade is secured. The swivel arm displaces the saw blade in the blade direction, i.e., from its initial position, transverse to the plane of the rollers, in the operational position.
A blade protection holder is connected with the saw head and extends away from the head in a direction opposite to the blade immersion direction. The blade protection holder serves for receiving and guiding a blade protection member which at least partially covers the saw blade. Formlocking cooperation of the base, the io swivel arm, and the blade protection holder insures that independent on the position of the swivel arm, the blade protection holder always extend parallel to the blade immersion direction.
The blade protection member, which is pinned on the blade protection holder, is open at its end facing in the blade immersion direction and has two recesses which are likewise open in the blade immersion direction. The recesses partially extend over the length of the blade protection member parallel to the blade immersion direction. The two recesses have different lengths. The facing in the blade immersion direction, end region of the recess, which has a greater length, forms a stop which is engaged by an end of the blade protection holder facing in a ao direction opposite to the blade immersion direction in an initial position of the saw blade or the swivel arm.
During the sawing process, first, the saw blade moves from the initial position into an operating position. Then, the saw blade immerses into the constructional component. Finally, the entire saw is displaced in a direction transverse to the blade immersion direction along the guide rail by a push-type device, with the saw blade forming a cut in the constructional component. The distance between the free end of the blade protection member and the stop formed in the blade protection member, which likewise faces in the blade immersion direction, corresponds at most to the distance between a mating surface of the blade protection member facing in the direction opposite to the blade immersion direction and the free end of the blade io protection member facing in the blade immersion direction. Dependent on the diameter of the saw blade, the blade protection member abuts the surface of the constructional component essentially simultaneously with the start of the immersion step of the saw blade or shortly thereafter. Upon contact of the blade protection member with the surface of the constructional component, the blade protection holder becomes offset relative to the blade protection member in the blade immersion direction.
The blade protection member, which lies on the constructional component obscures the view of the saw blade and, therefore, impairs the view of the processing location. Therefore, it is very difficult for the operator to precisely 2o determine the immersion depth of the saw blade in the constructional component.
The immersion depth can be determined only after corresponding displacement of the saw blade in the horizontal direction by, e.g., a meter.

Accordingly, an object of the present invention is to provide a saw that insures a.n easy visualization of the saw blade immersion depth in the constructional component by the operator.
BRIEF SUMMARY OF THE INVENTION
This and other objects of the present invention, which will become apparent hereinafter, are achieved by providing, on the saw, means showing an immersion depth of the saw blade as the saw blade becomes progressively immersed into a sawn component.
With the inventive means for indicating the immersion depth of the saw blade io in the sawn constructional component, the operator can determine, without using any additional measuring tool, the depth at which the saw blade is located in the constructional component and to ascertain that the saw blade has immersed to a predetermined depth.
Preferably, the depth showing means are provided on the blade protection holder or the blade protection member, preferably, in form of marking. The marking can be provided as elevations, indentations, or colored marks arranged one after another in the blade immersion direction.
To facilitate and accelerate reading of the immersion depth of the saw blade, preferably, there is provided at least one scale mounted on the blade protection 2o member and extending parallel to the blade immersion direction, with the depth being defined by a position of the mating surface of the blade protection holder with respect to the scale. The blade immersion depth correspond to the value mark indicated on the scale and lying in the same plane as the mating surface of the blade protection holder. E.g., the scale can have a plurality of marks spaced from one another by Icm and provided with figures the value of which increases in the immersion direction.
When the blade protection member is pinned on the blade protection holder, the stop of the blade protection member becomes engaged by the mating surface of the blade protection holder. Because, the blade protection member should not be aligned, with respect to the scale, in a direction parallel to the blade immersion to direction, advantageously, the nill-value of the scale is located in the same plane as the stop of the blade protection member.
The diameter of the saw blade, which is used in the saw depends on its required immersion depth in the constructional component. In order to be able to insure a good handling of the saw, for smaller depths, saw blades having smaller diameters are used, and for larger depths, saw blades having larger diameters are used. In order to be able to show the immersion depth both when the saw blade having a smaller diameter is used and when a saw having a larger diameter is used, there are provided two scales mounted on the blade protection member, with a nill value of one of the scales lying ahead of a nill value of another of the scales in the ao blade immersion direction by an amount corresponding to a half of a difference of diameters of both saw blades. An additional mark on both scales, which shows a saw blade radius, indicates which scale for which diameter is to be used.

For manufacturing reasons, advantageously, the mating surface is defined by the free end of the blade protection holder which faces in a direction opposite to the blade immersion direction.
The novel features of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments, when read with reference to the accompanying drawings.
to IN THE DRAWINGS:
The drawings show:
Fig. 1 a schematic view of a saw according to the present invention in an initial position thereof; and Fig. 2 a schematic view of the inventive saw in an operational position thereof.
DESCRIPTION OF A SPECIFIC EMBODIMENT
A saw according to the present invention, which is shown in Figs. 1-2, has a base 1, a swivel arm 2, a saw head 3, a saw blade 15, a blade protection holder 4, 2o and a blade protection member 5 covering the saw blade 15. The base 1 is provided with rollers 17 for displacing the saw along guide rails 12. The guide rails 12 are mountable on a surface of a to-be-cut constructional component 14 with an aid of intermediate support element 13.
The base 1, which is not shown in detail, has a drive motor, not shown, for driving the saw head 3 on which the saw blade 15 is secured. The saw head 3 is provided at the free end of the swivel arm 2 located sidewise on the base 1 and pivotable about an axis that extends parallel to a plane in which the rollers 17 are arranged. Upon pivotal movement of the swivel arm 2, the saw blade 15, which is secured on the saw head 3, becomes offset in a direction transverse to the plane in which the rollers 17 are arranged.
Io The saw head 3 is connected with the blade protection holder 4 which extends in the direction opposite to the blade immersion direction, i.e., away from the constructional component 14. The blade protection holder 4 has two spaced from each other and extending parallel to each other, guides 16 which serve for receiving and guiding the blade protection member 5. The cooperation of the elements of the base 1, the swivel arm 2, and the blade protection holder 4, it is insures that the guides 16 of the blade protection member 5 always extend transverse to the plane in which the rollers 17 of the base 1 are arranged, independent of the orientation of the swivel arm 2.
The blade protection member 5, which is pinned on the blade protection 2o holder has, at its free, in the blade immersion direction, end, two recesses 10, 11 open in the blade immersion direction. The recesses 10, 11 extend along a portion of the height of the blade protection member measured parallel to the blade immersion direction. At that, the length of the recess 10 is greater than the length of the recess 11. The recess 11 has a width which, measured in the direction transverse to the blade immersion direction, is larger than an axis section, not shown, between the swivel arm and the blade protection holder 4. The width of the recess 10 exceeds that of the recess 11. The inner, adjacent to each other and extending parallel to the blade immersion direction, profiles of the recesses 10 and 11 in the blade protection member are provided with guide grooves 18 into which guide members 16, which are provided on the blade protection holder, can be inserted. The end regions of the guide grooves, which face in the blade immersion io direction, form two stops 6 that are engaged by a free end 7 of the blade protection holder 4, which faces in a direction opposite the blade immersion direction, in an initial position of the saw.
On the outer side of the blade protection member 5 in the region of the guide grooves 18, there are arranged two scales 8 and 9 corresponding to respective saw blade diameters (e.g., 1400 mm and 1000 mm). Each scale 8, 9 contains numerals the value of which increases in blade immersion direction. For the scale 9 (blade diameter - 1000 mm), the value "0" lies in the same plane as the stop 6 of the blade protection member 5.
The "0" value of the second scale 8 (blade diameter - 1400 mm) lies ahead ao of the first scale 9 in the blade immersion direction by an amount corresponding to a half of a diameter difference of two blades (one having a diameter 1000 mm and another having a diameter 1400 mm). The value "500" on the scale 9 corresponds s to half of the diameter of the associated blade which has a 1000 mm diameter.
The value "700" on the scale 8 likewise corresponds to half of the diameter of the associated blade which has a 1400 mm diameter.
During blade immersion, the swivel arm 2 pivots in the blade immersion direction. Upon the pivotal movement of the swivel arm 2, the blade 15 submerges into the constructional component, i.e., it is translatory displaced thereinto. The distance L1 between the free end of the blade protection member 5 and the stop thereof corresponds at most to the distance L2 between the mating surface of the blade protection holder 4, which faces in a direction opposite to the blade immersion to direction, and the free end region of the blade protection member 5 facing in the blade immersion direction. Thereby, the blade protection member 5 abuts the surface of the constructional component 14 simultaneously with or shortly after the start of the blade immersion process as the blade 15 immerses into the constructional component 14. As a result, the blade protection holder 4 becomes offset with respect to the blade protection member 5. The depth, by which the blade 15 is immersed into the constructional component 14, is defined by the position of the free end 7 of the blade protection holder 4 with respect to the respective scale 8,9.
Though the present invention was shown and described with references to ao the preferred embodiments, such are merely illustrative of the present invention and are not to be construed as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the art. It is therefore not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.

Claims (6)

1. A saw, comprising a base; a saw head for receiving a saw blade, connected with the base, and displaceable in a blade immersion direction; a blade protection holder connected with the saw head and extending from the saw head in a direction opposite the blade immersion direction; a blade protection member at least partially covering the saw blade and displaceable relative to the blade protection holder parallel to the blade immersion direction, the blade protection member having a stop facing in the blade immersion direction, with a distance (L1) between a free end region of the blade protection member facing in the blade immersion direction and the stop corresponding at most to a distance between a mating surface of the blade protection holder facing in the direction opposite to the blade immersion direction and the free end region of the blade protection member facing in the blade immersion direction; and means for showing a immersion depth of the saw blade as the saw blade becomes progressively immersed into a sawn component.
2. A saw according to claim 1, wherein the depth showing means are provided on at least one of the blade protection holder and the blade protection member.
3. A saw according to claim 1, wherein the depth showing means comprises at least one scale mounted on the blade protection member and extending parallel to the blade immersion direction, and wherein the depth is defined by a position of the mating surface of the blade protection holder with respect to the scale.
4. A saw according to claim 3, wherein the nill-value of the at least one scale is located in the same plane the stop of the blade protection member is located in.
5. A saw according to claim 3, wherein the depth showing means comprises two scales mounted on the blade protection member, and wherein a nill value of one of the scales lies ahead of a nill value of another of the scales by an amount which reduces the distance (L1) between the free end region of the blade protection member, which faces in the blade immersion direction, and the stop by a distance (L2) between the mating surface of the blade protection holder and a center point of the saw head.
6. A saw according to claim 3, wherein the mating surface is formed by a free end of the blade protection holder facing in the direction opposite the blade immersion direction.
CA 2313753 1999-07-20 2000-07-12 Saw Abandoned CA2313753A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19933145.6 1999-07-20
DE1999133145 DE19933145A1 (en) 1999-07-20 1999-07-20 Sawing device

Publications (1)

Publication Number Publication Date
CA2313753A1 true CA2313753A1 (en) 2001-01-20

Family

ID=7914869

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2313753 Abandoned CA2313753A1 (en) 1999-07-20 2000-07-12 Saw

Country Status (5)

Country Link
EP (1) EP1072355A3 (en)
JP (1) JP2001062825A (en)
CA (1) CA2313753A1 (en)
DE (1) DE19933145A1 (en)
PL (1) PL194107B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7210474B2 (en) 2005-03-23 2007-05-01 Saint-Gobain Abrasives Technology Company Saw blade with cutting depth gauge
DE102007059477B4 (en) * 2007-12-11 2016-11-24 Mafell Ag processing machine
CN102275183B (en) * 2009-01-22 2015-02-04 苏州宝时得电动工具有限公司 Portable circular saw
DE102011116873B4 (en) 2011-10-25 2022-06-02 Festool Gmbh Hand machine tool with a display arrangement
EP3827952B1 (en) 2019-11-29 2022-08-17 EURODIMA GmbH & Co KG Wall saw with guide for saw blade guard

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1503974A1 (en) * 1966-02-05 1970-07-30 Metabowerke Kg Circular saw
IT218080Z2 (en) * 1988-10-25 1992-03-30 Bolzoni Emilio CARTER OF PROTECTION FOR TOOLS WITH ROTATING DISC
US5010651A (en) * 1990-07-10 1991-04-30 Skil Corporation Portable circular saw
DE19511725A1 (en) * 1995-03-30 1996-10-02 Hilti Ag Wall slot device

Also Published As

Publication number Publication date
EP1072355A3 (en) 2004-02-04
PL194107B1 (en) 2007-04-30
DE19933145A1 (en) 2001-01-25
EP1072355A2 (en) 2001-01-31
PL341553A1 (en) 2001-01-29
JP2001062825A (en) 2001-03-13

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