US2371374A - Abrasive block - Google Patents

Description

March 13, 1945. n G. BAHN 2,371,374

ABRASIVE BLOCK Filed Der?. 14, 1942 ,fy@ INVENTOR.

ATTE RN EYE Patented Mar. 1K3, 1945 uN IIT-Ep -I STATES PATE form-fc E n winst; p i x ABRAsIvE Broca George Ban, Los Angeles, Calif.

Application December 14, 1942', Serial No. 468,945

1 Claim. (Cl. 51-185) My invention relates to mounts o1' holders for an abrasive material such as sandpaper, emery cloth and the like, andvhas among its objects and advantages the provision of an improved block structure designed to constitute a measuring instrument for cutting such material to proper lengths from a supply roll to t the block structure in a snug manner, wherein the construction is such as to facilitate placement and removal of the abrasive and to effectively hold the material in an efcient manner, in addition to embodying a structural contour such as to provide a maximum sanding surface with a minimum of abrasive waste.

In the accompanying drawing: g

Figure 1 is an end view illustrating the block sections in an open position;

Figure 2 is an end'view illustrating the block sections in their closed positions for work purposes;

Figure 3 is a face view of the block sections in the position of Figure 1;

Figure 4 is a sectional view taken along the line 4 4 of Figure 3; and

Figure 5 is a top plan View of the block sections in the position of Figure 1. Y

In the embodiment selected for illustration, I make use of block sections IU and I2, which `are identical with respect to size and contour. These block sections are swingably and pivotally connected one with the other through the medium of links I4 and screws I6 threaded into the respective block sections lll and I2 at the medial planes thereof. The links I4 are of such lengths and the screws I6 so positioned that the block section I2 may be completely reversed to position either face in overlapping engagement with the block section Ill. Figure 2 illustrates the normal working relationship of the two block sections. Each of the block sections is provided with a groove I8 which is arranged at an acute angle to an parallels -the edge face of its respective block section. Both grooves I8 are spaced the same distances from the respective edge faces 20.

Figures 1 and 2 illustrater a sandpaper strip 22 as having edge margins 24 lying in the grooves I8. When the block sections are moved to the position of Figure 2, the strip 22 is pinched rmly between the block sections by reason of its engagement with the pressure faces 26 on the block sections. To connect the block sections Il) and I2 in a sturdy manner for Work purposes, the section I2 is provided withpins 28 receivable in sockets or bores 30 in the section I0. Thus the two block sections are keyed firmly against relative movement when the block is being manipulated for work-finishing purposes.

Considerable diculty has heretofore been encountered in cutting sandpaper and emery cloth to proper lengths from a rolled supply. To facilitate manipulation of the sandpaper block in connection with nishing Work, it is highly desirable to connect the abrasive material in a firm manner with the block. The abrasive material should iit snugly so as to eliminate slack. In the instant case, the abrasive material may be cut to exact lengths through the medium of the block as a measuring instrument.v

When cutting a length, the end of the stripinwardly across the face 26 on theblock section I2 and the end inserted in the groove I8 in this.

block section, the material is of such length as to be drawn tightlyto all the exterior faces of theblock when the sections are closed to the position of Figure 2.

After cutting the abrasive material for length, the block section I2 i'spivoted away from the block section I0 to permit the latter section to be grasped in the left hand, with the thumb of that hand pressed over the sheet extending across the face 26 of that section. The section I2 is then completely reversed to press against the sheet lying on the face 2B of the section I0 and the thumb of the left hand is then placed over the section I2 to support the block assembly. With the block section yI2 completely reversed, the groove I8 in the block section I2 is readily accessible for insertion of. the other end of the sheet. This end of the sheet isthen held against the face of the block l2 and the latter is completely reversed and dropped to the position of Figure 2, which draws the sheet tightly to the contour of the block assembly and clamps the two end margins rmly between the two block sections.

The block sections IIJ and I 2 in combination with the faces 26v and the grooves I8 constitute a measuring instrumentthrough the medium of which the pieces may be cut to exact lengths tov fit the block structure in a taut manner. This facilitates cutting of the lengths' and eliminates waste incident to cutting of the lengths in exsaid sections normally lying face to face and having grooves extending longitudinally in these opposed faces to receive the end margins of a sheet of abrasive material trained over and about the outer side, top and bottom faces thereof, the groove in one of said sections being oppositely angled with respect to the groove in the other of the sections, and a pair of pins projecting from the inner face of one of said sections for engagement Awith sockets formed in the opposed face of the other of the sections, the opposite inturned endportions of the abrasive sheet being firmly clamped between the sections when the latter are normally disposed.

' GEORGE BAFIN.

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