Claims
- 1. A saw tooth and tooth holder combination for a cutting saw, the saw including a substrate, the tooth holder formed as a clevis straddling the substrate, each clevis holder including a U-shaped member having a pair of legs extending on either side of the substrate, and having a body portion formed at the bight of the U-shaped member straddling the substrate, the body defining a bore, the saw tooth including a tooth head having a small end and divergent surfaces extending to a large end with a concave recess formed at the large end of the head and forming cutting edges at the intersection of the concave recess and the divergent surfaces, a shank extending within the bore and attached to the head at the small end thereof, and the body defining a tooth receiving seat including a platform and an abutment surface for receiving the divergent surfaces and the small end of the head respectively, the tooth including the tooth shank and head extending in a tangential axis to the substrate with the large end of the tooth head projecting in the direction of movement of the saw substrate, the legs defining recesses into which cupped sleeves are provided, and a bolt and nut extends through the substrate to retain the cupped sleeves against the substrate and thereby retain the tooth holder in position on the substrate.
- 2. A saw tooth and tooth holder combination as defined in claim 1, wherein there are two sets of recesses on the legs, one fore and the other aft of the legs of the holder, with a pair of nuts and bolts passing through the substrate and the legs to retain the holder on the substrate.
- 3. A saw tooth and tooth holder combination as defined in claim 1, wherein the shank is in the form of a bolt extending from one end of the holder through the bore to threadably engage the head and secure the head against the holder.
- 4. A saw tooth and tooth holder combination as defined in claim 1, wherein the head is in the form of a frusto pyramid having four sides.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part application of application Ser. No. 469,853, filed Jan. 23, 1990 now abandoned.
1. Field of the Invention
The present invention relates to cutting saws, and more particularly, to a saw tooth insert and the means for mounting it to a saw.
2. Description of the Prior Art
It is now common to use circular saws on feller buncher heads, for severing the trunk of a tree to be felled. Since the circular saw is made to rotate in a horizontal plane near the ground, when the feller buncher head is in an operative position, it is not surprising that the teeth inserts on the periphery of the circular saw may be subject to severe shocks. In such situations, it is desirable to minimize the damage to the circular saw. It would be preferable to contain the damage to one or only a few teeth which could then be easily replaced.
Most prior art circular saws include a circular disc with radial inserts mounted in gullets cut out in the discs. Thus, in the event that a tooth bit should strike an immovable object, such as a boulder, it is conceivable that the tooth and bit would be destroyed with the possibility of damage to the disc as well. The loads would, in most cases, be transmitted through the tooth shank sitting radially in the gullet, and thus to the disc. It is evident that such loads would be applied tangentially to the saw disc against the radially extending shanks. C-shaped teeth would also be faced with similar stresses causing probable damage to the disc.
It is an aim of the present invention to provide an improved replaceable saw tooth with a novel tooth holder for mounting the tooth on the substrate of the saw.
It is a further aim of the present invention to provide an improved circular saw with replaceable saw teeth on the periphery thereof mounted in such a way that gullets are not required in the circular saw disc.
It is a further aim of the present invention to provide an improved saw tooth insert and holder whereby the tooth insert may be rotated to extend the life thereof.
A construction in accordance with the present invention comprises a saw tooth and tooth holder combination for a cutting saw. The saw includes a substrate, and the tooth holder is formed as a clevis which straddles the substrate, each clevis holder including a U-shaped member having a pair of legs extending on either side of the substrate and having a body portion formed at the bight of the U-shaped member straddling the substrate. The body defines a bore, and the saw tooth includes a tooth head having a small end and divergent surfaces extending to a large end with a concave recess formed at the large end of the head and forming cutting edges at the intersection of the concave recess and the divergent surfaces. A shank extends within the bore and is attached to the head at the small end thereof. The body defines a tooth receiving seat including a platform and an abutment surface for receiving the head. The tooth including the tooth shank and head extends in a tangential axis to the substrate with the large end of the tooth head projecting in the direction of movement of the saw substrate. The legs define recesses into which cupped sleeves are provided, and a bolt and nut extends through the substrate to retain the cupped sleeves against the substrate and thereby retain the tooth holder in position on the substrate.
In another aspect of the present invention, there is a saw tooth and tooth holder combination for a cutting saw, wherein the saw includes a substrate and the holder is adapted to be releasably fastened to the substrate. The holder includes a tooth receiving seat which includes a first platform surface and an abutment surface at an angle thereto formed in a body of the holder. Bore means extend in the body through the abutment surface, at least a pair of teeth are mounted on the tooth seat in side-by-side relationship, with each tooth being identical and having a head including a small end and a large end with divergent surfaces therebetween. The small end is adapted to fit against the abutment surface, and the divergent surfaces are adapted to fit on the platform. Shank means pass through the respective bores to each head and are attached thereto. Each of the tooth heads includes a concave recess at the large end thereof and forms cutting edges at the intersections of the concave surface and the divergent surfaces, whereby each tooth is capable of being rotated about its axis to present exposed cutting surfaces.
An advantage of the present construction is that the teeth and holders are mounted on the exterior of the disc. In the event that a tooth or several teeth should strike an immovable object, individual teeth and holders may be sheared from the disc or otherwise damaged, without transmitting damaging loads to the saw disc, and thus the remainder of the circular saw remains usable. The damaged teeth and holders can be replaced. Furthermore, it is contemplated to rotate the teeth in the holders in order to spread the wear and increase the life of such teeth.
US Referenced Citations (14)
Foreign Referenced Citations (1)
| Number |
Date |
Country |
| 57201121 |
Mar 1988 |
JPX |
Continuation in Parts (1)
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Number |
Date |
Country |
| Parent |
469853 |
Jan 1990 |
|
Patent Grant
5085112
