Stone working – Sawing – Endless
Reexamination Certificate
2001-03-21
2001-08-28
Banks, Derris H. (Department: 3723)
Stone working
Sawing
Endless
C125S012000
Reexamination Certificate
active
06279565
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an articulated lock for a saw rope and including a first articulated member having a sleeve-shaped region for receiving an end of the rope and a connection region formed of two, spaced from each other cheeks having coaxial bores, a common axis of which extends perpendicular to a longitudinal extent of the first articulated member, a second articulated member having a sleeve-shaped region for receiving another end of the rope, and a connection region having a through-opening and connectable with the connection region of the first articulated member, and joining bolt means for pivotally connecting the first and second articulated members.
2. Description of the Prior Art
For cutting of natural or virgin stone, brickwork, reinforced concrete, and the like or for treating of precise profiles, sawing ropes, which are provided in rope saws, are used. For guiding a sawing or a saw rope in and outside of a rope saw, deflection or guide rollers are used, with the rollers being provided with an outer profile corresponding to the rope. The saw rope is formed of a steel cable, a plurality of cutting beads formed of diamond cutting grains and distributed over the steel cable, and an articulated lock which connects the opposite ends of the saw rope with each other. The saw rope, the cutting edges of which have a circular outer profile, bends during treating of constructional component, which results in rotation of the entire rope about its axis. The advantage of this rotation consists in that the outer profile of the cutting beads wears substantially uniformly. In order for the rope to be guided about the deflection rollers well and reliably also in the region of the articulated lock, the lock includes, e.g., two articulated members with two articulated axes crossing each other at an angle of 90°. Because of this, the two articulated members can rotate or pivot in opposite directions upon rotation of the rope by 90°. A saw rope of the type described above is disclosed in EP-680395B1.
Each of the two articulated members has a fork-shaped receiving region with two cheeks and has a sleeve-shaped receiving region fixedly connected with a saw rope end. The two articulated axes are formed by two joining bolts which extend through respective cheeks of the articulated members and respective bores of an intermediate member that projects into the space between the two cheeks of both articulated members. Because of the two articulated axes arranged one after another in the longitudinal direction of the articulated lock, the lock has a large length. In addition, the lock is formed of a comparatively large number of parts and has a relatively large weight.
Accordingly, an object of the present invention is to provide an articulated lock having a reduced length and a reduced weight.
Another object of the present invention is to provide an articulated lock that can be economically produced and that insures a reliable connection of the two ends of the saw rope.
SUMMARY OF THE INVENTION
These and other objects of the present invention, which will become apparent hereinafter, are achieved by forming the connection region of the second articulated member as an eye-shaped section and by providing in this section or portion a through-opening the diameter of which exceeds the diameter of the joining bolt at least in the region of the opposite, spaced from each other, side surfaces of the eye-shaped portion.
The articulated lock according to the present invention has two articulated members pivotally connected with each other by a single joining bolt. Each of the two articulated members has a sleeve-shaped receiving region which is fixedly connectable with a saw rope end. Both articulated members are pivotable about two articulated axes or in two planes in opposite directions, with the axes or planes being arranged relative to each other at an angle of 90°. The first axis is defined by the axis of the joining bolt. Thus, the two articulated members are pivotable in opposite directions in a first plane which extends perpendicular to the axis of the joining bolt. Due to a particular shape of the through-opening of the connection region of the second articulated member, the second articulated member can rotate in a second plane in which the axis of the joining bolt is located.
The particular shape of the second articulated member insures a very short length of the entire lock. The inventive articulated lock can be economically produced and has a reduced weight as it is formed only of few, easily formed, components.
In order to provide for a reliable pivotal movement of the second articulated member relative to the first articulated member in the plane in which the axis of the joining bolt is located, the distance between the two side surfaces of the eye-shaped portion, which is measured parallel to the axis of the through-opening formed in the eye-shaped portion, diminishes toward the receiving region and/or the free end of the connection region. Preferably, the largest distance between the two side surfaces corresponds to a width between the inner surfaces of the two cheeks of the first articulated member.
A good abutment and guiding of the saw rope over the outer profiles of the deflection rollers is advantageously achieved when the side surfaces of the eye-shaped portion or at least their sections form with each other an angle from 5° to 20°, preferably an angle of 15°. With respect to the longitudinal axis of the second articulated member, the angle, at which the side surfaces extend thereto, is the same on both sides. It is, of course, possible to provide side surfaces that would extend to the longitudinal axis of the second articulated member at different angles.
In order to form both articulated members of the lock so that they can be guided over the outer profiles of the deflection rollers, which serve for guiding the rope, the articulated members are so shaped that they can slightly rotate in opposite directions in a circumferential direction. This relative rotation is achieved by reducing the distance between the two side surfaces, in a direction perpendicular to the axis of the through-opening and the longitudinal axis of the receiving region, toward the outer profile of the second articulated member.
Advantageously, the width between the inner surfaces of the two, spaced from each other cheeks of the first articulated member increases toward the receiving region of the first articulated member and/or toward the free end of the receiving, fork-shaped region of the first articulated member. Thereby, a reliable pivotal movement of the second articulated member relative to the first articulated member in the plane of the axis of the joining bolt is achieved. With this shape of the cheeks, the inclination of the side surfaces of the connection region of the second articulated member toward its longitudinal axis can be dispensed with, and they can be so formed that the distance therebetween remains the same over the entire length of the side surfaces.
An angle, over which the second articulated member rotates relative to the first articulated member in the plane of the axis of the joining bolt, depends on inclination of the inner surfaces of the cheeks relative to the longitudinal axis of the first articulated member.
Advantageously, the inner surfaces of the cheeks or at least the sections of the inner surfaces form with each other an angle from 5° to 20°.
In order to adapt both articulated members of the lock so that they can be guided over the outer profiles of the deflection rollers, which serve for guiding the rope, the articulated members are so shaped that they can slightly rotate in opposite directions in a circumferential direction. This relative rotation is achieved by increasing the width between the two inner surfaces of the cheeks, in a direction perpendicular to the axis of the bores and the longitudinal axis of the receiving region, toward the outer profile of the first articulated member.
The pivotal movement
Plattner Josef
Spangenberg Rolf
Banks Derris H.
Hilti Aktiengesellschaft
Sidley Austin Brown & Wood LLP
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