US222396A - Improvement in guides for circular saws - Google Patents

Description

E. M. GUERNSEY. Guides for Circular-Saws.

No. 222,396. Patented Dec. 9, I879.

the saw upon opposite sides.

\ horizontal section.

UNITED STATES PATENT EDWIN M. GUERNSEY, or MONTPELIER, VERMONT.

IMPROVEMENT IN Gill-DES FoR CIRCULAR SAWS.

Specification forming part of Letters Patent No. 222,396, dated December 9, 1879 application filcjd l Aprill5,1879. I I I To all "whom it may concern: C

Be it known that I, EDWIN M. GUERNSEY, of Montpelier, in the county of Washington others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to that class of de- Vices principally employedlin saw-mills Where circular saws are used for the purposeof guidingthe faces of the saw so as to keep it inthe proper line of cut. Many devices of different constructions have been employed for this purpose, among which may be mentioned the most simple, consisting of a slotted wooden block bolted to the saw-frame, and provided with studs within the slot,.which nearly touched lacked all means of adjustment, and of course soon gave way to guides of more complex construction, some of them provided withmeans for adjusting the block both laterally and longitudinally, and still others with the lastnamed adjustmentsand means for moving the studs to the saw independently of the block which carried them, and so arranging these means that the sawyer might control the position of the guides withoutleaving his place at the end of the saw-frame. But all of these devices have hitherto proved faulty in several points, which it is the object of this invention to correct. y

The invention therefore consists in certain details of construction, whichwill be hereinafter fully described, and then specifically stated in the claims.

Figure 1 of the drawings is a perspective view, showing the guide complete. Fig. 2 is a plan, partly in section, the upper part of the standard or cap havingbeen removed by a Fig.3 is a section ofthe standard with the jaw-arms removed. Fig. 4

\ h is a transverse section on the line a: as of Fig. 2.

In constructing this guide the standard A the jaws B and C. These devices is preferably cast in a single piece,its base I being provided with the elongated openings or slots a; a, through which the bolts pass that secure'the guide to the saw-frame. This method of construction allows the guide to be moved toward or from the saw-arbor as the position of the jaws with relation to the sawsaw as is practicable. The top of the standard presents only smooth rounded surfaces,

and may therefore be brought up nearly to the line of the bearing-rollers withoutyincurring any danger, as there are no bolts, nuts,

or other projections from it to beicaught by the inequalities of the log. I I

I In casting this standard two cores are inserted in the mold, which form the chambers b andb for the reception of the arms B O of One of these, the chamber I), has an enlargement, 0, extending nearly one-third of the way around its circumference,

the object of which is to allow the jaw B,

which comes upon the outside of the saw, to be turned up vertically, so as to allow of the removal of the saw from the arbor without the the arm (3 to prevent its rotation from the ac; tion of the saw upon the jaws or othermeans.

It will be understood that these chambers may be formed by boring them out of the solid metal, if desired but as this process involves greater expense, without a corresponding increase in utility, I prefer the method of coring heretofore stated, which leaves but a short bearing space at each end of the chamber,

which willrequire the services of a boring instrument to prepare'thein for the reception of the guide-arms. The ends of these arms which enter the chambers are tubular, and'are screwt-hreaded internally for the reception of the adjusting-screws D and D, which revolve int-he bearings a at one end of the chambers. Each of-these adjusting-screws is provided with a hand-wheel or milled head, by which it is operated, of slightly less diameter than the outer casing of the chambers, so that the screws will not be liable to be turned by the lumber which may move over them, but are protected from such accidents by the top of the standard.

It will be seen that these adjusting-screws afford a ready means of adjusting the jaws to the saw by their action upon the arms, even when the saw is running, without incurring the slightest danger from the latter, an item of great importance in devices employed for this purpose, as many serious accidents have occurred from the use of the ordinary guide .in the attempts of the sawyer to change its position while the saw was in motion.

The jaws, as well as their carrying-arms, are retained in position after adjustment by the set-screws h h, which are placed beneath the chambers b and b passing through their walls, so that their points may be made to bear directly upon the arms of the jaws, thus holding thelattersecurely in any position in which they may be placed by the adjusting-screws. The position in which these set-screws are placed enables the operator to manipulate them without danger, and saves them from injury by passing objects.

The whole device will be found to fill a want long felt by millmen, as it is not only simple in construction, and therefore cheap, but efficient in its action, and free from danger to the operator.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent, the following:

1. The standard A, formed as shown and described, in combination with the jaw-arms B O, and set-screws h, placed beneath the chambers b and b, for the purpose specified.

2. The standard A, provided with the chamber b, having extension 0 for the reception of the key d in the semi-rotating jaw-arm B, to prelvent the full rotation of the latter, as specifiec 3. The combination of the standard, formed as described, the tubular jaw-arms, the adjusting-screws, and the setscrews, all constructed and arranged for joint operation, in the manner and for the purpose set forth.

In testimony that I claim the foregoing as my own I hereunto affix my signature in presence of two witnesses.

EDWIN M. GUERNSEY.

Witnesses:

JAMES W. Baocx, GEo. W. WING.

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