US2664589A - Carpet gripper - Google Patents

Description

Filed July 27, 1951 C. M. SZPILBERG CARPET GRIPPER 2 Sheets-Sheet l .Ewenl'or Zaz'i/z zgoz'lb rlg 1954 c. M. SZPILBERG 2,664,589

CARPET GRIPPER Filed July 27, 1951 2 Sheets-Sheet 2 Patented Jan. 5, 1954 UNITED STATES PATENT OFFICE CARPET GRIPPER Chaim M. Szpilberg, Montreal, Quebec, Canada Application July 27, 1951, Serial No. 238,817

3 Claims.

Introduction Applicants development The applicant has now developed a carpet gripper which is excellent for the purpose and at the same time overcomes disadvantages of the prior devices. The applicant has found that a much better grip on the carpet obtains when each engaging means includes a pair of closely spaced points parallel to the longitudinal axis means, the means of each row being staggered as compared with those in adjoining rows. Only half as much tension is applied to any localized portion of the carpet and only half as much strain put on any one point of one thread.

One of the applicants preferred forms of gripper has as a base a strip of wood. There are a number of staples inserted through the strip with their points projecting beyond its surface at an angle. These staples are preferably arranged in spaced apart rows. In the case-of a strip 1%; inches wide, the applicant prefers to use two or three rows with the staples spaced so that the prong of one staple spaced approximately 1 inch from the prong of the adjacent staple and the staples of respective rows staggered. The staples penetrate the base at an angle between 50 to 60 to the face of the strip. Plywood is a most suitable materia1 from which to make the strip. The base layer usually has its grain run-- ning lengthwise, the intermediate layer cross contrast to plywood. One suitable wood is bass wood.

In an alternative construction according to the invention, the pairs of prongs may be formed on a metal strip. These pairs are preferably arranged in rows, the prongs of each row staggered. There may be, for example two or three rows. The metal strip may be a channel member and it can include a wooden filler. The function and manner of applying the gripper made in this way is similar to the application of the strip made entirely from wood using staples as the engaging means.

Detailed description Further details of the invention will be gathered from the following detailed description of several preferred embodiments which are illustrated in the accompanying drawings, and in which: 1

Figure 1 is a perspective view of a carpet gripper of a preferred form, according to the invention.

Figure 2 is a fragmentary plan view partly in cross-section of the corner of a room in which a carpet has been laid, according to the invention, usin the applicants preferred type of gripper.

Figure 3 is a fragmentary cross-section substantially along the lines 3-3 of Figure 2.

Figure 4 is a fragmentary vertical cross-section along the line 44 of Figure 2.

Figure 5 is a vertical cross-section taken along the length of the gripper of the previous figures showing the relationship to a cement floor.

Figure 6 is a perspective view of another kind of gripper, according to the invention.

Figure 7 is a greatly enlarged perspective view of a part of the gripper shown in Figure 6.

Figure 8 is a schematic view of the bottom of a carpet illustrating the manner in which the gripper operates to engage the normal type of carpet Figure 9 is a perspective View of a staple of a type preferred for use in connection with the invention.

Referring more particularly to the drawings the preferred gripper shown uses a plywood strip as the base. This strip includes a primary layer ill in which the grain runs lengthwise, a secondary layer l5 in which the grain runs cross-wise and a third layer H5 in which the grain runs lengthwise. While only three layers have been illustrated, it is understood'that five layers could also be used. A one-piece strip of wood can be employed, but plywood is preferred. 1

Rows of staples 25, 2S and 21 penetrate the base A and have their points 2%, 26b and 21b projecting diagonally beyond, as best shown in the figure, and their heads 25a, 26a and 21a embedded in the underside of the edge of the strip A. If the floor is of wood, the head 25a of the staple may be embedded beneath the surface of the strip. If the floor is cement, the head may be flush with the surface of the strip.

:Function 51 The gripper is applied as follows. The strips A" are nailed or cemented to the floor B with: the inside edge spaced slightly from the wall C? leaving enough room to push the edge of the car- 1 pet between the wall and the'gripperiA felt mat D of the same thicknesssas the gripper. is laid to cover the entire free floor space. The Carpet action of the points is better than in the case of single points.

Figure 9 shows a form of staple preferred for use in connection with the invention.

This staple has a pair of spaced apart shanks I50 and i! connected by a bridge portion I52. The staple is quadrilateral in cross section. The shanks are tapered at their ends to form points.

The preferred dimensicnspf thestaple are as oafollows. The thicknesslof the staple represented "by 0. preferably ranges from about 0.030

(thirty thousandths) to about 0.065 (sixty-five thousandths) and is by choice about 0.040 3 f(f0Ii'/y thousandths). The dimension b is 5 preferably about 0.090 (ninety thousandths).

The length of the staple i. e. the dimension d may range-from about of an inch to about of an inch.

E is then laid over the felt andnilh r pp s The inside dimension 0 from shank to shank with the edge of the carpet stretched and imso may range from about {is or an inch to about A;

pa ed -.on;.the-. prongs of .the .staples; Aimolding F may be placed in the angle of the wall tocover the edgeof thecarpetoverthe-top otthegripper, {Ifhe carpet may-.bestretched into placebyspecial;

of an inch andziszpreferably around of an inch. The staplesin the same row. arespaced apart .fromcenter to center preferably. from about 1% .to about 2 /211. The distance between the'staples i gripping devices available for t p A in each row, center to center, is preferably from s. foureedgesof. thecarpetare gripped by a gripper i .at each wall. The-gripper of the invention has the following advantag.es.:- It can be positively and easily anto'about 1 /4".

The preferred strip width is around 1%". There are preferably two or. three rows of staples longitudinally of.the stripih which the choreditoia floorof cement; wood or othermate- 9 staples ar staggered. laterally pt 151; n

rial. --.1t-1can;be,n ai1ecl;. it can be cemented. The gripping prongs are-solidly anchorediin. th base strip. The base strip itself is strong and will not allow removal or shifting of the prongs. The device is flexiblein that it"cambe made in various 3 sizes, widths andwthicknessesas It is made from 1 eadily,availablematerialsmInmaking the griper; the :prongs can bezadgiusted-so that'the gripu ever isrcalibratedntothespaoingpof the, warp and H one preferredconstruction the staplesbf one row are from the edge" of the strip at one side. This is astwo-row strip.

The. more shots. in. the .carpet: asmaller staple is better. -Fori exampleinacarpethai/ing.8 or 9 shotsperinch aa staple '.of. about T g?! (dimension 20) is best. ..ln.the case of-carpets. having 5 orfisshots'pen inch a..staple of.abo'ut. .(dimension (0). .1/4 ispreferred.

w n a particular rp e p en r pp 40; l The angle. of.=-the..staple..to the-surface of the 1. vgri-p the" carpet better; than-4 most previous qdevices. One particular advantage of employing stapless 1; nis that'thegpo'ints havearbetter grip-:on'the warp and weftofithe-carpet; This is .becausepairs of -..=;:,;-;-heads;;ofthegstaples as ,wellxas to the-wood.

. rArr-ralte nate.for rof r ripper is: showrrn Fispoints 1 2.5; I125 and-1H1: areproyidedson an .elonat dsmetabbase- 3111 this. case .;the;-=metal is a g channel G having flanges E30 and provided witha wooden filler Mil-r-rEoints 112.5,: 1:35 and I2! :arerform d .bmpunching out ii hei fi l'fQf the strip G as shown. In use, the device :furictions imilarlyto the'device of the previous figures. z fijigure 8 is a horizontalr-cross-section looking mpwardsirtaken just under the carpetzsubstam I :tia-lly along the line 0'-'8 of Figure: 3.- The warp h-reads are; represented 1=by.:,.50. and therweft .hreads by 5!. The points-.25; 2B and :21 are in ap int s'r ppatrthesame time, two l s ly spaced a;likely to split thezwood.

lites-6 and l: Iii-this case-sp ced:apa trpairs f i strip may, range from around ioitoaroun'd 65.

. Where alower angle isemployed. staples need be .longerthaninthe case.wherealiighenangle is .f.employed.

d The. useof staples instead of single nails. has a number. ofmadvantag'es'. Thestaple always en- ,..,gages the carpet; at two closely spaced. .apart ,...points.." .80 lesspressure is.applied..to. thecarpet at anyone point-and likewise .less..pressureis apl'plied tothe stap1'e..-.. .Whereasinthe case o'flnails, -a shank thickness sfromsabout. seventy. .to about eighty. thousandths, thatis about isstandard,

with staples the wire'cari. be from 0.0625.....down to about-0.0.40Gias.illustrated. This .in turn recementisused: Hiecementadheres:to-the wide acts 'favomblywon theimanufarctureiofrthe product..-.- The smallershanks of the staples are less L .:.:1 Thesapplicant can nurther ;.emp1oy. ordinary wood-,zfor example bass woodyinsteadofplywood.

If desired, thB"TWO0d can berprovided with. a fac- "ingzot paper :or cloth or eveni-e'. coating of plastic or rubber from a solution.

"So the present construction is advantageous not only infunction, but also in manufacture. Iclaim:

- I. A carpet gripper, comprising, an "elongated narrow thinwoodenstrip adapted to lie along a :door'margin and be anchored to it and "having a bottom face and a top face, a plurality of i5 staples 'extending through the strip andeach having abridge portion adjacenttothe'hottom .positiontoengage the;adjacent Warpthread, or waits-thread. as :the. case may;-:.be', at two 1 closely l.

spaced apartpoints. The :pointsgstraddle the 1;

cross threadsc.- .-Because.rof thisarrangement the.

r face and a pair 'of' prongs extending from said ridge p'ortion through the strip and." extending tia' carpet-grippinganglefrom the top face, the oastaplesbeing arranged :in apluralit of rows lon- 5 gitudinally of the strip, the bridge portion of each staple extending longitudinally of the strip whereby its prongs are substantially equally spaced from the margin of the strip, the prongs of each staple being spaced apart from about 1% to about whereby they are adapted to cooperate in engaging closely spaced apart portions of the carpet under tension with each prong taking about half the pull, the respective staples in each row being spaced apart from about 1%" to about 2 /2 between their centers.

2. A carpet gripper, according to claim 1, in which the grain extends lengthwise.

6 3. A carpet gripper, according to claim 1, in

Number Name Date 118,019 Johnson Aug. 15, 1871 406,451 Lange July 9, 1889 10 2,211,574 McNicholas Aug. 13, 1940 2,238,946 Roberts Apr. 22, 1941 2,429,256 Block Oct. 21, 1947 2,514,335 Owens July 4, 1950

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