US2396823A - Pressure unit - Google Patents

Description

Mardi 19, 194.6. I C, D BURBANK TAL l 2,396,823.

- PRESSURE UNIT original Filed May 25, 1942.

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' Patented Manie, 1946 PRESSURE UNIT p Clifford D. Burbank and Thomas "Harry, Jr.,

`llackson, Mich., assignors, by mesne assignments, to Wilma Rhodes Richards, Grand Rapids, Mich.

substituted for abandoned application Serial No. 444,356, May 25, 1942. This application August 30, 1945, Serial No. 613,576

1 Claim.

The present invention relates to pressure units and more particularly to quickly adjustable pressure clamps or vises. The device of the instant invention is in the nature of a modification of and improvement over the device illustrated and described in Patent No. 2,313,361, dated March 9, 1943, under which applicants are the exclusive licensees.

The primary objects of the present invention are to provide a pressure unit of the general character above indicated having fewer parts than are employed in the device of the fio-pending application for patent above identified; to provide such a device whose pressure rod adjusting sleeve is integrally formed; to provide such a device whose pressure rod adjusting sleeve is provided with an interrupted external thread in screw threaded engagement with the internal thread of an outer sleeve whereby the movement. of the adjusting sleeve is limited in one direction; to provide such a device having an improved type of pressure foot;

and, to provide such a device which is convenient,

and efficient in use and which is reasonably economical in manufacture.

An illustrative embodiment of the invention is shown in the accompanying drawing, wherein:

Figure 1 is an elevational view of the pressure unit, here shown as in the form of a C-clamp;

Figure 2 is an enlarged sectional view thereof on line 2--2 of Figure 1 and showing the pressure rod adjusting sleeve within its outer sleeve together with the longitudinally slidable pressure rod within its adjusting sleeve;

Figure 3 is a sectional view on line 3 3 of Figure 2;

Figure 4 is an enlarged fragmentary view of the pressure foot of the device; and

Figure 5 is a sectional view thereof -on line 5 5 of Figure 4.

Referring then to the drawing wherein like parts of the device shown are designated by the same numerals in the several views, the pressure unit illustrated is in the form of a C-clamp, genand a locking roller I6 disposed Within the slot i 5 is retained therein by washers I l, I8 inserted within the bore of the sleeve. I4 adjacent its opposite ends. The slot I5 which communicates with the bore of the inner sleeve and which is greater in depth at one end than the diameter of the locking roller I6 is of less depth at its other end than the diameter of the locking roller and it gradually tapers in depth from the larger end to the smaller end and it provides an eccentricall 7 arranged concave gripping or clutching surface which cooperates with a pressure rod I9 to engage the locking roller and cause the same to lock the pressure rod to the inner sleeve when the rod is rotated in one vdirection and to free the rod when the latter is rotated in the opposite direction. The pressure rod I9 has a sliding t in the bore of the inner1 sleeve and when free` to move is capable of longitudinal sliding movement in the inner sleeve and also to rotary movement independently of the inner sleeve when the roller I6 is out of locking engagement with the inner sleeve and the pressure rod.

The pressure rod I9 has a cross head 20 and is longitudinally slidably embraced within the sleeve I4 and retaining washers II, I8 and it has a reduced portion ZI flared outwardly at its extremity 22. The flared extremity of the pressure rod I9 .is provided with a concave surface 23 and the pressure foot I2 having a concave well 24 within which the ball 25 is seated, is secured to the foot end of the pressure rod I9 by fingers 26 struck inwardly therefrom which spacedly embrace the reduced erally designated I0, having a jaw II and a rotatably adjustable pressure foot I2 between which a plurality of work pieces may be quickly clamped under adjustable pressures.

The arm I3 of the C-clamp is provided with a l right hand screw threaded bore within which an externally screw threaded pressure rod adjusting sleeve I4 is screw threadedly disposed.

This sleeve I4 is provided with a longitudinally disposed slot I5 eccentrically broached or cross sectionally deeper along one length than along itsl opposite length, all as best shown in Figure 3 portion 2l of the pressure rod.

The inner end of the pressure rod adjusting sleeve I4 is provided with an interrupted external screw thread or shoulder 2l as shown, providing means for unlocking the pressure rod I9 from its adjusting sleeve I4, all as now to be presently described.

Operation ted lines in the same view, effecting a seizure between the pressure rod I9 and its adjusting sleeve I4. Continued clockwise rotation of the cross head 20 effects a rotation of the adjusting sleeve I4 within the screw threaded bore of the arm I3 of the C-clamp I0 to secure a plurality of work pieces between the jaw II and rotatably'adjustable pressure foot I2.

A reversed or counterclockwise rotation of the cross head 20, effects a release of the binding pressure of the locking roller I6, seized between the pressure rod 19 and its adjusting sleeve I4, when the interrupted portion of the external screw thread Orr shoulder 2,15 of the sleeve VIR* fails to" longer ctn-act with the internalv screw threadA of the bore within the arm I3 of the clamp i or when the adjusting sleeve I4 is rotated from its position shown in full lines in Figure 2 to its position shown in dotted lines in the same view, permitting a manual sliding movement of the pressure rod I9 and its presure foot I2I away fromfthe jaw Il, thereby releasing the'work piecesprevi# ously held therebetween and preparatory to the next clamping operation.

The ball 25 seated Within thewell 2 4othe pressure foot I2 and in engagement with the concave surface 22 of the extremity of the pressurerod L9A reduces to a minimum the transfer of torsional' strain upon thepressureird I9 in instances'where clamping pressures areapplied,` permitting the `effective holding and retention of non-parallelsurfaces ofiwork'pieces between the jaw l I and pressure foot I2 since the pressure foot adapts itself tothe Work pieces clampedftherebetween.

It will thus be seen that the pressure unit herein illustrated'and described is inthenature of aV modification of. and improvement overy the device shown and described in: the above identied Pat- 1 ent No. 2,'313`,361,in thatzthe deviceofthe present invention is lcomposed of'. fewer `parts, the; pressure rod adjusting. sleeve is integrally formedand is provided With an interrupted external thread or shoulder for limiting its movement Within the outer sleeve for releasing the seized pressure rod and permitting its longitudinal sliding movement and that an improved type of pressure foot is here provided.

'Whilebutl one specicembodiment of the invention has been herein shown and described, it will be understood that certain details of the construction shown may be altered or omitted without departing from the spirit of the invention as the same is defined-by the following claim.

We claim:

Aclutchmechanism comprising an outer sleeve, an inner sleeve having screw-threaded engagement with the outer sleeve and movable longitu dinally within the latter, the inner sleeve having a longitudinal slot therein which is confined within the cross-sectional area of the inner sleeve and which is cross-sectionally deeper along one length thereof than along its opposite length, the threads of the inner sleeve being mutilated at one end of the inner sleeve, a locking roller disposed in said slot, and a rod slidable in the inner sleeve and Operable upon movement in one direction to cause a locking connection betweenV the rod and the inner sleeve, the mutilated part of the threads of the inner sleeve permitting a release of the locking connection when the rod is moved in the opposite direction.

CLIFFORD D. BURBANK. THOMAS HARRY, JR.

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