US2515550A

US2515550A - Chain saw

Info

Publication number: US2515550A
Authority: US
Inventors: Joseph J Ciba
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-09-17
Filing date: 1947-09-17
Publication date: 1950-07-18
Anticipated expiration: 1967-07-18

Description

Patented July I8, 1950 UNITED STATES PATENT OFFICE CHAIN SAW Joseph J. Ciba, Mansfield Center, Conn. Application September 1:7, 1947, Serial No. 774,513

, 1 Claim.

This invention relates to new and useful improvements and structural refinements in chain saws, and the principal object of the invention is to provide a device of the character herein described, which, being equipped with cutting teeth of particular conguration, requires lesser actuating eifort to perform a given work, so that its eiliciency is considerably increased as compared to chain saws of conventional design.

A further object of the invention is to provide a chain saw which may be operated at fast speed and which may be employed for rip cuts, cross cuts, and diagonal cuts with substantially equal expediency.

Another object of the invention is to provide a chain saw which is longitudinally balanced on both sides, as it were, so as to minimize the possibility of its teeth becoming bent or broken.

An additional object of the intention is to provide a chain saw which is simple in construction, which may be easily and conveniently operated, and which may be easily sharpened.

A still further object of the invention is to provide a chain saw which will lend itself to economical manufacture, and which is otherwise well adapted for the purpose for which it is intended.

With the above more important objects in view, and such other objects as may become apparent as this specification proceeds, the invention consists essentially of the arrangement and construction of parts as illustrated in the accompanying x drawings. in which:

Figure 1 is a side elevational view showing a portion of the chain saw constructed in accordance with the teachings of the present invention.

Figure 2 is a top plan view of the subject shown in Figure 1.

Figure 3 is a cross-sectional view, taken substantially in the plane of the line 3 3 of Figure 1.

Figure 4 is an underside plan view of the subject shown in Figure 1.

Figure 5 is a cross-sectional view, taken substantially in the plane of the line 6-6 of Figure 1, and

Figure 6 is an exploded perspective view illustrating the links used in the invention;

Like characters of reference are employed to designate like parts in the specification and throughout the several views.

Referring now to the accompanying drawings in detail, the invention consists of a chain saw, a portion of which is indicated by the reference character I 0, the same embodying in its construction a plurality of links II, I2 which are pivotally connected together as at I3 by means of suitable coupling strips I 4 of more or less conventional type.

The links I I, I2 are similar with exception that one is left-handed While the other is righthanded, so to speak, but the description of one will suffice for both.

Each of these links is formed integrally from one piece of material and comprises a strap-like body I5 provided on one longitudinal edge thereof with a protuberance I6 and with a laterally offset web Il.

An inturned flange I 8 is formed at the outer edge of the web Il, and it should be explained that the outer edge I9 as Well as the ilange IB is disposed in a divergent plane with respect to the longitudinal cross-sectional plane 20 of the body I5. Moreover, the flange I8 is also angulated or inwardly inclined as at 2 I, and the leading edge 22 of the flange is bevelled yso that it may coact with the cutting edge I9 to form a cutting point 23.

The protuberance I6 is disposed forwardly of the web IL that is, in advance of the cutting point 23, and the protuberance constitutes what may be referred to as a cleaning tooth, while the portions I'I and IB constitute a cutting tooth.

In the assembly of the saw, the coupling strips I4 are longitudinally aligned and the links II, I2 are disposed alternately at the relatively opposite sides of the coupling strips, as will be clearly apparent.

Attention is particularly directed to the fact that the webs Il on the alternate links are oilset to the relatively opposite sides of their respective bodies, so that the transverse distance 24 between the cutting points 23 (as shown in Figure 5) is greater than the thickness 25 of the chain. When the invention is placed in use, the cutting points 23 embed themselves into the material to be cut and the cutting action itself is performed by these points as well as by the edges I9. In this manner, the cutting teeth constituted by the portions Il, I8, function in the manner of a plow, so to speak, that is to say, the cutting points 23 first engage the work, whereupon the edges I9 actually perform the work, in much the same manner as a plowshare or blade engages the ground. By virtue of this particular cutting tooth formation, the saw may be operated at considerable speeds Aand a relatively small actuating effort will be required to perform a given work, as compared to saws of conventional types.

It is believed that the advantages and use of the invention will be clearly apparent from the 3 foregoing disclosure and accordingly. further description thereof at this point is deemed unnecessary.

While in the foregoing there has been shown and described the preferred embodiment oi this invention it is to be understood that minor changes in the details of construction. combination and arrangement of parts may be resorted to without departing from the spirit and scope oi the invention as claimed.

Having described the invention, what is claimed as new is:

In a chain saw link, a plate having a ilat elongated base portion and an integral web extending upwardly to one side from said base portion in an acute angular plane relative thereto, the upper edge of said web being inclined from a horizontal longitudinal axis oi' said base portion, and

i5 Number 4 an integral ilange extending laterally and downwardly from the upper edge of said web toward said base portion, the upper end edge ot said ilange being beveled and the adjacent end edge portion oi' said web being whereby the upper end of the upper edge of said web terminates in a pointed extremity.

JOSEPH J. CIBA.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Name Date 2,321,962 Zandecki June l5, 1948 2,326,854 Bauler Aug. 17, 194!