US2492602A - Hand sander - Google Patents

Description

Dec- 1949 T. R. STIENBERG ET AL 2,492,602

HAND SANDER 2 Shefs-Sheet 1 Filed Nov. 8, 1948 I r n 8 r 2 J 3% mnh flm w n fi wdm y; mF

v 1366- 1 T. R. STENBERG ET AL 7 2,492,602

HAND SANDER Filed Nov. 8, 1948 2 Sheets-Sheet 2 lfnvpni'ors:

morniunwqnbpr g, Fned 7! Jf cng Patented Dec. 27, 1949 Thornton R. Stenberg, Troy, Fred '1. King, Larchmont, and Milton Immermann, Piermont, N. Y., assignors to Behr-Manning Corporation, Troy, N. Y., a corporation of Massachusetts Application November 8, 1948, Serial No. 58,978

13 Claims.

The present invention relates to an abrasive implement of the type in which a strip of coated abrasive, such as sandpaper, abrasive cloth, and

prise some sort of body or block, with means for clamping an abrasive strip against the working surface thereof. Many include a chamber or receptacle for a reserve supply of abrasive strip material in coiled form. Since such. devices are 1 well understood in the art, a further description of their use and advantages is unnecessary.

The primary object of the present invention is to simplify the construction of hand sanders, to

the end that they may be produced at a minimun; in

cost, without sacrificing any of the essential or desirable features thereof. V

A further object of the invention is to provide an improved and simplified mechanism for clamping and tensioning a coated abrasive strip in operative relation upon the body or block of a hand sander.

Another object is to provide an improved body or block construction providing an improved receptacle or chamber for a reserve supply of abrasive strip material. 7

Another object is to provide a body or block which cooperates with the clamping and tensioning mechanism in an improved manner so that the latter mechanism performs the additional function of closing and opening the chamber for the reserve supply of strip.

Incarrying out the objects of the invention, anextremely simple device has been provided, consisting essentially of only three parts, constructed and arranged to perform the necessary functions of prior devices, all of' which have been more complicated and expensive to manufacture.

In the accompanying drawings, certain illus trative embodiments of the invention are shown, in which:

Figure 1 is a side elevation of a hand sander;

Figure 2 is a vertical, longitudinal section substantially through the center of Figure 1;

Figure 3 is a front elevation of Figure 1, looking toward the left end thereof;

Figure 4 is a rear elevation of the device of Figure 1, looking toward the right end thereof;

' Figure 5 is a plan View} Figure 6 is a view similarto'Figure 1, with the abrasive strip removed and :with the tensioning 2 and clamping mechanism in the inoperative position;

Figure 7 is a side elevation of the body or block, with the clamping and tensioning mechanism removed;

Figure 8 is a perspective View of a form of primary locking yoke, and

Figure 9 is a fragmentary elevation of a modified form of block.

In the drawings, the body block Ill is indicated as made of a single, solid piece of suitable material, such as wood, cast metal, plastic or the like, but it must be understood that the block may, if desired, be fabricated from a plurality of pieces, particularly if made of molded plastic, as will be Well understood by those skilled in the plastic molding art. The block or body includes a plane bottom surface II, a' somewhat rounded and forwardly and downwardly pitched top wall surface [2, a rear end wall I3, a front end wall l4, and side walls I5 and H5. The top wall adjacent the forward end is shaped to provide a substantially vertical channel l7, while the rear end wall is also provided with a horizontal, transverse channel Hi.

The body has formed therein a chamber 20 of substantial size opening through the side walls l5 and I6, and communicating with the rear end wall l3 through a slot 21, above the channel l8 therein.

The side walls of the block may be relieved as at 22 or 23 to provide finger grip recesses adjacentthe bottom wall ll. Also, the side walls may be provided with generally V- shaped recesses 24, 25 adjacent the. top surface 12, for a purpose hereinafter explained.

The chamber '20 constitutes a receptacle for a reserve supply of coated abrasive strip in coil form as indicated at 26 in Figures 1 and 2. The

7 preferred free end of the strip is adapted to be threaded through the slot 2|, bent downwardly over the end face l3, led forwardly under the bottom H, upwardly over the front face l4 and rearwardly over a portion of the top surface I2, beyond the channel ll.

Preferably the bottom surface ll of the block is provided with a layer of substantial thickness of rubber or similar resilient material, as indicated at 28, to provide a semi-soft backing for the abrasive stripand to enable the abrasive surface to conform somewhat to the work.

The means for tensiom'ng and clamping the abrasive strip in'place comprises a double link toggle, including a pair of yokes, one pivoted to the block and the other to the first yoke, so'

that the swinging movement of one yoke to looking position draws the other yoke into locking position and moves the toggle links past dead center, to maintain the assembly in locked position. In the embodiment illustrated, the first yoke 30 includes a pair of parallel, sheet metal legs 3| and 32, interconnected by an integral transversely bent, blade-like head 33. The legs are pivotally connected to the side faces of the body by pins 34, 35 or the like and are provided with rearwardly and downwardly projecting, plate extensions 36, 31 which serve as closures for the open ends of the chamber 20 when the parts are in the position shown in Figures 1-5.

The second link 40 of the toggle mechanism may comprise a relatively stiff spring wire yoke or bail, including legs 4! and 42, having their free ends hooked through appropriate openings in and pivotally connected to the legs 3'! and 32 of the first yoke, as indicated at 43 and 44, at points spaced forwardly of the fulcrum constitutedby pins -34'a'nd '35. The recesses '24 and 25 accommodate the bent ends 43 and 44 of wire yoke in the downward movement'thereof, as indicated in Figure '5. The legs 4| and 42'a're interconnected at their rear ends. by an integral transversely extending head portion 45, which may include angular end sections 4B"and .41 as indicated in Figures 4 and 5, to impart resiliency to the bail as a whole. For the same purpose,"the forward ends of the'le'gs' 4l,'42 maybe "forwardly and downwardly curved as indicated at 48.

When theprimary toggle link or yoke 30 is swung forwardly and 'downwardlyfrom the position shown in Figurefiftheblade-like head 33 thereof'enters the channel T7 in the top surface. If a coated abrasive strip has previously been laid over this channel, the head will force the same thereinto'and willapply tension to'the strip. 'The head of the-spring wire bail, positioned as indicated in'dotted lines in"1Figure '6, will be drawn forwardly-by the forward and downward swinging movement of the 'yokef30, with the result that its hea'ddfi'enters' the channel It? and clamps the coated abrasive strip "overlying said channel. The parts are so proportioned that, as the head 33 approaches the channel H, in its forward and downward swinging movement, the head '45 of the other yoke'entersthe'channel i8 and clamps the strip therein. Tension 'maybe applied manually to the free end of the strip in a rearward direction along the-topsurface [-2 of the block while the strip is thusclamped against the rear end face of the 'block. Continued downward swinging movement of'the first yoke forces the head 33 thereof and the underlying-strip into the channel 11, thereby further tensioning and finally clamping the strip in place against the bottom surface of the resilient pad 28.

'Si'multanejouslywith the locking and clamping of the-strip, the ends 36 and 31 of the yoke 30 swing upwardly and close the ends of the chamber or receptacle Ml for the coiled abrasive strip.

When the portion of the abrasive strip below the pad-2'8 has become worn, it-may be replenished by simply raising the yoke 30, thereby releasing the head 31, from a channel" I! and the head 435 of the yoke 40 from the channel l8. An appropriate length of-stripmay' then be'pulled outwardly through slot ZL wrapped downwardly over the endwall l3, forwardly under the bottom layer 28, and upwardly over the front portion of the top-wall, beyond. channel 11. The yokes may then be shifted to theposition shown in Figure l toclarn-p thenew strip in place and the worn end portion of the abrasive strip torn off and discarded.

The head 33 of the yoke may be provided with a forwardly and upwardly projecting extension 33', adapted to serve as a finger piece or rest for the hand of the user so that, as pressure is applied to the implement at the forward end thereof through the extension 33, the normal tendency is to maintain the toggle mechanism in locked position.

By reference to Figures 1 and 2, it should be noted that, when the parts are in the locked position, the toggles have swung past dead center. In other words, the fulcrum of yoke 3!] (on the axes of pins 34and 35) is positioned above a straight line drawn between the pivotal connections 43 and 44 of the toggle link and the point of application'ofpressure by the head 45. The yokes or toggle links in moving to their locking position are permittedfito swing past the dead center position by the resiliency of the yoke 40. Hence, they are maintained in the locked position by spring tension and-there is no tendency for the parts to become. released.

In themodification shown in Figure 9, the yoke 40 may be eliminated and a plate may be secured to the rear. end face of the block, adjacent the slot H". The plate has aplurality of teeth 5! which grip the abrasive strip .bent sharply thereover, and prevent further uncoiling thereof. In this case, the leveryoke30 acts as previously described, to close the endsof the chamber 20 and toclamp the opposite endof the strip in the channel formed in theupper surface of the block. Moreover,-.the tensionapplied to the-strip by the head 33' forces the strip downwardly .upon the gripping teeth 5,l and causes them to become embedded in the strip.

The. forwardly. and upwardly projectingextension'33, serving as afingerpiece, as previously described, may be constituted byaseparate piece, welded, riveted, or. otherwise secured tothe head 33, as in'dicate'din Figm esl, 2, and-6, or-may consist simply of anintegral extension ef the head'33, as indicated at 33" in Figure 8;

It should be understood that the invention is not limited to the .details-of construction and shape or proportion of parts-shown in the accompanying drawings and described'above, but inclu'des all variations and modifications :coming withinthe scope of theappended claims and their equivalents.

We claim:

1. A. hand sander comprising an elongated block shaped to provide azsubstantially planar bottom working surface-,npstanding side and end faces-, and a top-surfacannaend face having a transverse channel and. the. top. face. having: a transverse channeladjacent the opposite .end thereon-and means for tensioningsand: clamping a coated abrasive stripinthe channels'and along said bottom; surface, comprisinga pair of .U shaped yokes, one; having its legs pivoted on. a fixed "axis, directly to the side faces of the body for swinging movement of its head into one channel and the other yoke having its l egsapivoted tothe legs of the' first, yoke b'etween the fulcrum and the headthereof, the head ofth'e: second yoke being positioned to bedrawn intottheother channel as the head of the first; yoke isswung toward" and into said one channel.

2. A hand S5;I'IdB1{-"COmpllSing. 1 an: elongated block shaped to provideaa'substantially planar bottom-workingsi-irface; upstanding side and end faces, a. top surface a. receptacle for 1 i an abrasive striphaving a delivery opening in one end face, said end face having a transverse channel below the delivery opening and the top face having a transverse channel adjacent the opposite end thereof, and means for tensioning and clamping a coated abrasive strip in the channels and along said bottom surface, comprising a pair of U-shaped yokes, one having its legs pivoted on a fixed axis to the side faces of the body' for swinging movement of its head into one channel and the other yoke having its legs pivoted to the legs of the first yoke between the fulcrum and the head thereof,.thehead of the second yoke being positioned to be drawn into the other channel as the head of the first yoke is swung toward and into said one channel.

3. A hand sander comprising an elongated body shaped to provide bottom, top, side and end faces, said top face having a channel adjacent one end, and the end face remote therefrom having a transverse channel therein, said body having a chamber in the interior opening through said end face above thechannel, whereby a strip of coated abrasive coiled in the chamber may be drawn through theopening and wrapped around the block over said channels and under the bottom working surface thereof, and means for tensioning and clamping the strip, comprising 'a pair of U-shaped yokes, one pivoted on a fixed axis, directly to the side faces of the block for swinging movement of its head into one channel to force the strip thereinto, the other pivoted to the first yoke with its head positioned to be drawn into the other channel by the pivoting movement of the first, to draw the strip thereinto.

4. A hand sander comprising a block having an interior chamber communicating with an end face through a slot therein, said chamber constituting a receptacle for a coiled abrasive strip adapted to be threaded through the slot and wrapped downwardly over said end face under the bottom of the block and upwardly over a portion of the top face thereof, and means for tensioning and clamping the strip in said position, comprising a yoke having its legs disposed in parallel relation to the side faces of the block and pivoted on a fixed axis, directly thereto and a head adapted to be swung downwardly onto the strip disposed along the top face in clamping relation thereto, and a second yoke having its ends pivoted directly to the legs of the first mentioned yoke between the fulcrum and the head thereof, and having its head positioned to be drawn against said end face in clamping relation to the strip, upon downward swinging movement of the first mentioned yoke.

5. A sander in accordance with claim 4 characterized in that the legs of the first yoke are extended on the opposite sides of the fulcrum from the head and constitute closures for the ends of said receptacle when the head thereof is swung downwardly.

6. A hand sander comprising a block having a horizontally disposed, transverse chamber therein opening through the side faces and communicating with one end face through a slot therein and constituting a receptacle for a coiled coated abrasive. strip adapted to be threaded through the slot and wrapped downwardly over said end face, under the bottom of the block and upwardly over a portion of the top face thereof, said end face having a transverse channel below said slot and said top face having a channel adjacent the opposite end, and means for tensioning and clamping the strip in said position, comprising a sheet metalyoke having its legs disposed in parallel relation to the side faces of the block and pivoted thereto on a fixed axis and a bladelike head adapted to be swung downwardly into the channel in the top face, and a bail yoke having its ends pivoted directly to the legs of the first mentioned yoke between the fulcrum thereof and the head, and having its head positioned to be drawn into the end face slot upon downward swinging movement of the first mentioned yoke. 7. A hand sander comprising a block having bottom, top, side, front, and rear end walls, the block being shaped to provide a transversely disposed chamber opening through the side walls and a slot communicating with the chamber and opening through the rear end wall, said chamber forming a receptacle for a coil of coated abrasive strip, said rear end wall having a transverse channel below the slotand the top wall having a transverse channel adjacent the front end thereof, and means for clamping a strip against the bottom wall, comprising a double yoke toggle, one yoke being pivoted directly to the side walls on a fixed axis for forward and downward swinging movement of its head into the top wall channel and the other yoke being pivoted directly to the legs of the first yoke, ahead of its fulcrum, for forward longitudinal movement of its head into the rear wall channel upon said movement of the first yoke.

8. A hand sander comprising a block havingv bottom, top, side, front, and rear end walls, the block being shaped to provide a transversely disposed chamber opening through the side walls and a slot communicating with the chamber and opening through the rear end wall, said chamber forming a receptacle for a coil of coated abrasive strip, said rear end wall having a transverse channel below the slot and the top wall having a transverse channel adjacent the front end thereof, and means for clamping a strip against the bottom wall, comprising a double yoke toggle, one yoke being pivoted on a fixed axis to the side wall for forward and downward swinging movement of its head into the top wall channel and the other yoke having the free ends of its legs directly pivoted to the first yoke, ahead of its fulcrum, for forward longitudinal movement of its head into the rear wall channel upon said movement of the first yoke, the toggle being movable past dead center for locking and the second yoke being resilient to permit such movement and to hold the yokes in locked position under spring tension.

9. A hand sander comprising a block having bottom, top, side, front, and rear end walls, the block being shaped to provide a transversely disposed chamber opening through the side walls and a slot communicating with the chamber and opening through the rear end wall, said chamber forming a receptacle for a coil of coated abrasive strip, said rear end wall having a transverse channel below the slot and the top wall having a transverse channel adjacent the front end thereof, and means for clamping a strip against the bottom wall, comprising a double yoke toggle, one yoke being pivoted to the side wall for forward and downward swinging movement of its head into the top wall channel and the other yoke being pivoted to the first yoke, ahead of its fulcrum, for forward longitudinal movement of its head into the rear wall channel upon said movement of the first yoke, the first yoke including closure plate extensions, movable upwardly upon downwardly swinging movement of 7 the yoke to else-e the side wan eiseihil'ge of said chamber.

10. A sander in accordance with claim 7 char ac'terized in that the head of the first mentioned yoke includes an iipwardly and forwardly projecting finger-piece plate; adapted to receive pressure from the hand of the user to maintain the yoke in clamping relation and to transmit force to the work.

11. A sander in accordance with claim '7 char acter'ized in that the first mentioned yoke comprises a strip of sheet metal bent to U-shape, with its legs disposed in parallel relation to the side walls of the block and having rearward e'xtensions adapted to close the ends of the chamber.

12. A hand sander comprising a block having Bottom; top, side, front and rear walls, the rear wall having a transverse channel therein and the top "wen having an upwardly opening, vertically disposed transverse channel adjacent the front end thereof, and means for clamping a strip of abrasive material in said channels and against the bottom wall of the block, said means comprising a double yoke toggle, one yoke b'ein'g pi'voted to the side walls for forward and downward swinging movement and having a blade-like head arranged to swing substantially vertically into the top wall slot, to force the strip thereinto and to apply tension thereto, the other yoke having 30 l lunfibe r the free ends of its legs directly pivoted to the firstyblee aheaa or its fulcrum for forward lon glti'i'di'nal movement of its head into the rear wail ehafmel upon said movement of the first yoke, to clamp thestri'p therein.

13. A sander in accordance with clain'i 12 characterized in that the head of the first men tioned yoke includes 'a forwardly and upwardly projecting extension adapted to serve as a finger piece, to receive pressure from the hand of the user-and to m'aihtain saidhead in t slot.

i r g arrrqnn. STENBERG.

. MILTON 'IMMERMANN.

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

UNITED STATES PATENTS 2'0 Number I Name Date izsjess 'Gerne'z Feb. '20, 1872 342,579 Peter's -e Jan. 29, 1907 1520299 Wilson Oct. 28, 1''9'1'9 1,945,562 Wur'fschmidt Feb. 13, 1934 25 1,947,054 McReynoms Feb. 13, 1934 2,235,874 Ross June 9, 1942 2,446,625 Anderson Aug. 10, 1948 FOREIGN PATENTS Country Date 234,501 Great Britain July -1, 1926

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