US620255A - The morris peters co - Google Patents

Description

No.` 620,255. Patented Feb. 28, |899.

H. P. SCHOFIELD.

SAW CLAMP.

. (Application led Oct. 27, 1898.)

(No Model.) l 2 Shaets-Sheet I..

ik n

. No. 620,255. Patented Feb. 28, |899.

H., Il. SCHFIELD.

vSAW CLAMP.

(Application med oet. s?, 189e.) (No Model.) 2 Sheets-Sheet 2.

UNITED L STATES APATENT muon.

HENRY P. SCHOFIELD, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO L. L. FILSTRUP, OFSAME PLACE.

SAW-CLAMP.

SPECIFICATION forming part of Letters Patent No; 620,25 5, dated February 28, 1899. Application filed October 27. 1898. Serial No. 694,762. (No model.)

To all whom it may concern:

Be it known that I, HENRY P. ScHoFIELD, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Saw-Clamps, of which the following is a specification.

My invention is in the nature of an improved clamp for use more especially for holding band-saws during the operation of swaging the teeth thereof.

My object is to provide a cheap and effective clamp capable of much readier manipulation than any heretofore known.

In the accompanying drawings, Figure 1 is a view in side elevation of my improved sawclamping device with a fragment of a saw held by the jaws thereof; Fig. 2, a view in end elevation of the same; Fig. 3, a view in end elevation of a pivoted jaw member employed Fig. 4, an end elevation of the device with the jaw members separated and certain parts removed; Fig. 5, a plan section on line 5 of Fig. 2; Fig. 6, a broken plan section on line 6 of Figs. l and 2; Fig. 7, a broken plan section on line 7 of Fig. l; Fig. 8, a broken vertical section on line 8 of Fig. 1, and Fig. 9 a broken plan view of one of the sliding lock-bars employed.

The device comprises a suitable support A, a fixed jaw member or clamping-bar B, a pivoted clamping-jaw C, and mechanism for forcing the pivoted jaw member into its clamping position.

The support A comprises end standards A A2, a base cross-bar A3, having upturned flanges t t and -secured to the, standards by bolts t2, stay-rod D, and, carried by the end standards and preferably formed integrally therewith, uprights or arms s s', which serve to support the stationary clamping-bar B.

The jaw member C is supported on arms C C2, pivoted near their centers on a stationary shaft E, supported at its ends in the standards A and A2.

In Fig. 6 is shown the manner of forming the pivotal joint and providing for the attachment of two adjustable saw-supports F and G. At each end the shaft is by preference provided with the stepped or successively-reduced portions r, r', and r2, the latter of which is threaded to receive a nut I-I, provided at its outer side with an elongated boss or guide p, connected with which are slotted adjustable slides F G', forming part of the sawsupports F and G above mentioned. These slides are surmounted by grooved rollers n n', which receive the lower saw edge. By means of the supports F and G the device may be adjusted to receive saws of varying width.

At each end of the shaft the portion r2 projects through the adjacent slide and is fitted with a nut m. It will be observed that the pivoted and stationary arms are brought to 'the desired closeness of contact by the nut H, while the slides F and G are locked to the nuts I-I by means of the hand-nut m, the annular shoulders on the shaft being cut away Where necessary to afford the necessary movement of parts. Thus the slides may be loosened and readjusted without disturbing the pivotal adjustment of the `jaw-supporting arms C and C2.

The preferred means of forcing the pivoted jaw member into clamping engagement with its coacting member and the interposed saw is that shown. The arms C and C2 when in their upright position extend close to the cross-bar A3. Extending through guides I on said cross-bar are horizontally-disposed sliding lock-bars J J', having their outer ends provided with beveled surfaces Z, which engage the lower ends of the arms C C2 after the latter have been swung past the lock-bars vin the closing of the jaw member C. These beveled surfaces serve by their wedge-like action to force the jaw member C into grip- -ping contact with-the lsaw K. The lock-bars ,are'actuated-,by alever L, supplied with a handle t, and pivoted at lo on a lug k2 on the cross-bar A3, one of said bars having-loose pivotal or pin-and-slot connection (not shown) at los with said lever above the point Zt and the other at 104 below the point k. Thus the lock-bars are forced outward or inward, as the case may be, simultaneously.

I have shown in Fig. 1 a conveniently-located shelf M, supported on bracket-arms M M2, rigid with the shaft E.

The standards A A2 are equipped with IOO stops N N', which limit the downward-swinging movement of the pivoted arms C C2.

The manner of using the device is to gage the height of the saw-supports F and G to suit the size of the saw to be swaged, to then rest the saw upon the rollers n n', as indicated in Fig. 1, (any other suitable outside supports desired being provided where the saw to be sharpened is a band-saw,) and finally, supposing the pivoted jaw member to be swung so near to its vertical position as to permit the slide-bars to slip into the locking position, to throw the lever L from the position shown in dotted lines in Fig. l to the position shown in full lines, thereby clamping the saw firmly between the jaw members.

By reference to Fig. l it will be seen that the swinging jaw member is capable of being lowered to such an angle as to bring the bar C about on a level with the junction between the end standards and the stationary uprights s s'. This junction-line marks the lowest limit of the lower edge of the saw and-determines the capacity of the clamp as regards the width of saw which it will accommodate. The construction described is of the highest importance in a clamp that is to be used for a heavy band-saw-say a fourteen-inch saw twenty-five feet in length. In handling a saw of this size the saw curves or bulges laterally and is with difficulty raised to the desired height and guided to a narrow jaw-aperture. With my construction the saw is readily placed upon the almost horizontally-disposed swinging arms supporting the movable jaw member, which thus act as a rest for the saw preparatory to clamping the same, and as the jaw member is closed is forced with comparatively insignificant effort to its proper position. In this movement the lower edge of saw slides inward on the arms C C2 and is forced by said arms to move upward on the quarter-circular surfaces of the upper portions of the end standards, (representing the base of the cut-away portion which accommodates the movable jaw member.) Thus the saw is placed within the range of action of the clamp and raised to its proper position therein with comparatively small effort.

Changes in minor details of the construcfion within the spirit of my invention may be made.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a saw-clamping device, the combination of a suitable support, a stationary jaw member carried thereby, a pivoted jaw member constructed and designed to swing normally downward to such an angle as to cause its supporting-arms to afford a temporary rest for the saw preparatory to clamping the same in position, means for supporting the pivoted member in its lowermost position, and means for locking the jaw members in their closed position, substantially as and for the purpose set forth.

2. In a saw-clamping device, the combination of two end standards provided with rigid arms s s', and having a cut-away portion for accommodating the movable jaw member, a stationary clamping-bar supported by the arms s s', a movable jaw member pivoted to said standards below the base of the cut-away portion and capable of swinging downward to such an angle as to cause its supporting-arms to afford a temporary rest for the saw below the highest portion of the base of said cutaway portion, whereby the saw may be forced inward and raised upon said base portion, stops N N on the standards for arresting the downward movement of the pivoted jaw when the arms of the latter are in a proper position to afford a temporary rest for the saw, and means for locking the pivoted member in its closed position, substantiallyA as and for the purpose set forth.

3. In a saw-clamping device, the combination of suitable end standards, a base crossbar joining the standards provided centrally with a lug, a lever pivotally joined to the lug, guides on said cross-bar, slidable locking-bars provided at their outer ends with beveled surfaces and connected at their inner ends to said lever, one above and the other below the fulcrum thereof, a stationary jaw member carried by said standards, and pivoted jaw member supported by the standards and provided with depending arms engaged by the beveled surfaces of said locking-bars, substantially as and for the purpose set forth.

4. In a saw-clamping device, the combination of a suitable support having end standards carrying a fixed jaw member, a shaft projecting through said end standards and threaded at its ends, a pivoted jaw member on said shaft and means for closing'the jaws, nuts on said shaft outside of said standards provided with guides, saw-supporting slides on said guide-equipped nuts, and nuts outside said slides serving to clamp the slides to the inner nuts after the slides are adjusted, substantially as and for the purpose set forth.

HENRY P. SCHOFIELD. In presence of- D. W. LEE, R. T. SPENCER.

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