US2424167A - Strip locking means for abrading and polishing machines - Google Patents

Description

July 15, 1947. J HlL'L QulsT 2,424,167

STRIP LOCKING MEANS FOR ABRADING AND POLISHING MACHINES Filed March 1, 1946 M 3 \l ha l/I Patented July 15, 1947 UNITED STATES PATENT OFFICE STRIP LOCKING MEANS FOR ABRADING AND POLISHING MACHINES Karl J. Hillquist, Seattle, Wash.

Application March 1, 1946, Serial No. 651,354

2 Claims.

This invention relates to abrading devices, polishers and sanders and has reference more particularly to improvements in devices of that kind wherein a flexible strip of abrasive material, such as sand paper, emery paper or cloth, or other abrasive in flexible strip form, is applied about a rotatably driven drum to provide a polishing or abrading surface; it being the principal object of this invention to provide a simplified and effective means for securing the abrasive strip about the drum and for its quick and easy release for its removal.

More specifically stated, the object of the present invention is to provide a locking device of a novel form whereby the end portions 'ofthe abrasive strip may be securely clamped and held within a receiving slot that is formed radially of the drum and open to the surface thereof to receive the said end portions after the strip has been wrapped about the drum.

A further object of the present invention resides in providing the drum with a, radial slot to receive the end portions of the abrasive strip, and a releasable locking bolt mounted in the drum adjacent the slot and whereby the ends of the abrasive strip, after being applied within the radial slot, may be securely clamped and held by the pressure of the threads of the bolt thereagainst. Furthermore to so arrange the bolt that the threads secure the strip ends and also so engage them that in turning the bolt they will pull them into the slot and draw the strip taut about the drum.

Another obiect of the invention is to provide a locking device as above recited that provides for quick and easy locking and releasing of the strip merely by a partial rotation of the bolt.

Still further objects and advantages of the invention reside in the details of construction and combination of parts employed therein and in their mode of use as will hereinafter be fully described.

In accomplishing these and other objects of the invention, I have provided the improved details of construction, the preferred forms of which are illustrated in the accompanying drawings, wherein Fig. 1 is a perspective view of the drum portion of an abrading machine embodying therein the improvements of the present invention.

Fig. 2 is an enlarged, sectional detail illustrating the bolt of the present locking device in position for the insertion of the end portions of the abrasive strip into the drum slot preparatory to their being secured by the bolt.

Fig. 3 is a similar view showing the strip ends as applied to the slot and secured by the locking bolt.

Fig. 4 is a cross sectional view of that part of the drum containing the slot, as seen on line 4-4 in Fig. 2, a part being broken away for better illustration.

Referring more in detail to the drawings- I!) designates what may be a drum of typical form as used in an abrading machine or polishing device and which may be mounted and rotatably driven by any suitable means, for example, on a driven shaft and supported in a frame and driven by an electric motor or otherwise; this not being important in so far as the present invention is concerned. Applied about the cylindrical outer surface of the drum in is a strip or band of abrasive material l2. This may be a strip of sand paper, emery paper or cloth or any other abrasive in strip form adapted to be used on a drum of this kind.

Formed across the rim portion of the drum and in a radial plane thereof, is a narrow and relatively deep slot or channel It that is designed to receive therein the opposite end portions of the abrasive strip in an overlapped relation after the strip has been wrapped about the drum as shown in Fig. 1. Adjacent the slot 13 is an internally threaded bore l5 that extends through from face to face of the rim portion of the drum, parallel to the drum surface and opening along one side for its full length into the slot, as best shown in Figs. 2 and 3.

Contained in the bore is the present locking bolt I8, This bolt is threaded into the bore and extends from end to end thereof as shown in Fig. 4. Along one side, a segment of the bolt surface is cut away parallel to the bolt aXis to form a fiat side surface as designated at 2|) that extends from end to end of the bolt. When in place the bolt is so related to the slot that the flat surface may, by turning the bolt, be brought substantially into coincidence with the plane of the adjacent side surface of the slot l2 as has been shown in Fig. 2. Then, by rotation of the bolt through an angle of approximately ninety degrees, the rounded body of the bolt will extend into and partially close the slot as a means for securing the strip ends as has been shown in Fig. 3.

For the purpose of turning the bolt, it is formed across one end With a channel 25 designed to receive the end of a screw driver or other tool for this purpose. Such slots might, if desired, be applied to both ends of the bolt.

Assuming the parts to be so constructed and assembled as described, their mode of use is as follows:

First the bolt is applied to the threaded bore and is turned to the position in which it is shown in Fig. 2. Then the abrasive strip I2 is wrapped about the drum and its opposite end portions tucked down into the slot 13 as shown in Fig. 1. The strip should be of sufficient length that the strip ends would extend below the bolt. Then the bolt is rotated through about a quarter turn, in the direction of the arrow in Fig. 3, and in doing this the fiat ends of the threads along the top edge of the fiat surface of the bolt will be caused to engage against the strip ends and with the turning of the bolt, to pull them down into the slot and clamp them tightly between thebolt and opposite side surface of the slot. Dimensions are such that this will tightly secure the strip. Thus the securing of the strip is easily, quickly and effectively accomplished.

To release the strip for removal, it is only necessary to turn the bolt back to its starting position shown in Fig. 2.

Looks of this kind are applicable to machines ,7

of various kinds and in various sizes and are not applied for use and having a slot formed therein across the drum surface to receive the opposite end portions of an applied strip in juxtaposed relationship therein, a bore in the drum parallel with and opening into the slot along one side thereof, a threaded bolt mounted in said bore and having a flat surface formed along one side thereof adapted by turning the bolt in the bore to be brought into the plane of the adjacent side Wall of the slot for passage of the end portions of the strip; said bolt having a longitudinal edge portion bounding the flat surface thereof that may be caused, by rotative adjustment of the bolt, to move into the slot against the juxtaposed end portions of the strip to clamp them against the opposite wall of the slot.

2. A strip locking means as recited in claim 1 wherein the bolt is threaded into the bore, and wherein its threads form sharp teeth along the longitudinal edges of the flat surface portion thereof, that will engage with and clamp the strip ends against the slot wall when the bolt is rotated to the clamping position.

KARL J. HIILQUIST.

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

UNITED STATES PATENTS Number Name Date 220,993 Seel'ye Oct. 28, 1879 247,140 Wilhelm Sept. 13, 1881 603,357' Bagley May 3, 1898 1,757,679 Myers May 6, 1930 1,836,367 Emmons Dec. 15, 1931 1,975,630 Boettcher Oct. 2, 1934 2,344,550 Knowlton Mar. 21, 194%

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