US1532850A - Scissors - Google Patents

Description

A. T. YARD SGISSORS Filed Feb. 9. 1924 I Y y w I I I .V L f-LM' il?? WENT M A 70W/mavo )7WD BY @a j- K @if/ATTO R NEY 'W Fa'tented Apr. 7, l925.

Ni'rso STATES ABRAM TOWNSEND YARD, OF MATLEWOOD, NEW JERSEY.

SCISSORS.

Application tiled February 9, 1924. Serial No. 691,541.

To all who/m, t may concern.'

Be it known that I, ABRAM TowNsnND YARD, a citizen of the United States, and a resident of Maplewood, county of Essex, State of New Jersey, have invented an Im'- provement in Scissors, of which the following is a specification.

The present invention relates to an improvement in scissors-or shears, one object being to produce a device of the kind indicated which will have an' interchangeable blade whereby a cutting portion of the scissors can be removed and replaced at will and whereby a superior quality of steel or other suitable cutting metal may be employed in the blade. Inthe ordinary forms of scissors and shears, the permanent cutting qualities of the blade must usually be sacrificed because it is not possible to form the entire scissors of tool or other high grade steel economically by any known means of manufacture in large quantities. Accordingly, the scissors and shears in ordinary use are made of relatively soft steel and the cutting edges of the blades rapidly deteriorate in use. According to my invention, it is contemplated that a portion of the scissors or shears not directly employed in cutting shall be of a relatively light and easily formable material such as aluminum, for eX- ample, and the blade orl cutting portion shall be of high carbon steel or other suitable hard metal and readily attachable to and detachable from the frame ofthe scissors at will. In forms of scissors heretofore known and in which the blade is intended to be detachable, it has been found that the instrumentalities for effecting the attachment of the blade to the scissors frame have been eithercumbersome or defective in 0peration, or have been of such character that the cost of production has rendered the devices employing these expedients too eX- pensive to successfully compete lwith the ordinary well known forms of scissors and shears. Y

A preferred embodiment of my invention is illustrated in the drawings accompanying the present specification, and inwhich- Figure 1 is a top plan view` of a blade carrier,`

Figure 2, a side view thereof,

Figure 3, an edge view of a blade, Figure 4, a plan view of the blade shown in Figure 3,

Figure 5, an edge view of a modified form of blade,

Figure 6, a plan view of the modification shown in Figure 5, Y

Figure 7, an enlarged detail in section on the line 7-7 of Figure 2,

Figure 8, a transverse section on the line 8 8 of Figure 2, and

Figure 9, a transverse section on the line 9-9 of Figure 2.

Referring' to the. drawings, scissors embodying my invention include broadly a blade carrier 1 provided with a removable blade 2 and means whereby the blade 2 may be detachably secured to the blade carrier 1.

v In a preferred form of my improved device,

the carrier 1 is provided with opposed longitudinally extending undercut grooves 3 and 4, each communicating with a tongue receiving recess 5. The blade 2 is provided with resilient projecting tongues 6 and 7 preferably formed integrally with said blade by being struck out ofthe material thereof.

As indicated more clearly in Figure 8, these tongues 6 and 7 are disposed at an angle to each other, said angle corresponding substantially to the angle formed bet-Ween the axes of the corresponding grooves in the carrier 1. Thus, whenl the parts are in assembled relation, the tongues 7 engage groove 4 and the tongues 6 engage groove 3. In assembling the parts, the tongues 6 and 7 are first inserted inthe recess 5 and are then moved longitudinally with the blade into eective blade retaining position. As indicated more clearly in Figures 7, 8 and 9, a preferred form of blade carrier will include flanges-8 and 9 overlying their respective tongue receiving grooves, said flanges being preferably of increasing cross sectional area from one end to the other of their ef.- fective tongue engaging length. Thus, as shown in Figure 7 the fiange'S increases in cross sectional area from the recess through which the tongues are inserted in the direction of movement of the tongues as they are moved into blade retaining position. Aocordingly, as the tongues move forward in the direction of the arrow during the attaching operation, the under surface 10 of the flange 8 acts as a cam bearing Vagainst the upper surface of the corresponding tongue and depressing the same, thereby drawing they blade 2 into firm or pressed engagementv with the blade engaging sur- "held securely connected thereto by a suitable bolt oi' other Well known means, the reinovable blades will be retained against endivise movement and therefore remain in fixed operative engagement with their respective carriers.

1n Figure rand 6, 1 have' illustrated aY modi'dcation including a blade 11 'having tongues 12 and 13 performing substantially the saine 'function as the tongues G and 7 ai'idcoopeiating in a similar manner with suitable grooves in a carrier such as the blade carrier 1. inn addition thereto, the carrier is provided with a recess 111 at the rear end of the blade receiving portion, said recess being positioned and adapted to receive andA engage a projection 15 struck dow'iifr'om the material of the blade l1. it is contemplated that a blade embodying this construction Will be'i'nade of steel sufiiciently resilient to bend readily Without permanent deformation so that the blade may be assembled on the blade carrier by engaging the tongues 12 and 13 in suitable recessesfand then l'moving 'the blade longitudinally to- Ward the front end of the blade carrier. During the first portion of this operation, vrearwar'dly disposed portions off the lower surface oithe blade will ride on the shoulder 16 of. the blade carrier and as the blade approaches operative position, will slip downy into engagement with the blade engaging surface oiE the carrier and in such position that the projection 15 will lit into the recess 14;, thus aifording"additional security against endwisemovement ofthe blade. Y

b'viouS'ly, difl'erent conditions of use or various sizes of scissors -oi vshears will indi-- cate variationse'in construction from tliede- 'tails hereinabove described. Thus, in soine correspondingly increased number of 1 sets of tonguesti and'7 Furthermore, varying 'conditions may-indicate the necessity for varying the relative sizes or lengths of the toi g es and their cooperating grooves, it being contemplated that in soineecases relatively vlong tongues will be more appropriate than shorter tongues. tion as to Ythese details of construction, it is believed that the saine ivill still be properly considered Within the scope or niy invention as disclosed in the drawings and defined in the claims appended hereto.

l claim as my invention: f

1. Scissors comprising a blade carrier having Ylongitudinally extending undercutgrooves opening' in the blade engaging face -ofsaid carrier anda tongue receiving recess coin'niunieating With said undercut grooves, 'and a blade liavingtongues progecting from one :tace thereof and positioned to engage said grooves to retain the blade in pressed engagement with the carrier.

2. Scissors including a blade carrier having a 'longitudinally extending slot in its blade engaging face and opposed undercut grooves opening into said slot, and a blade having spaced pairs of opposed resilient tongues engaging said undercut grooves to hold the blade in pressed engagement With the carrier. Y* Y c 3. Scissors comprising a blade carrier having longitudinally extending undercut grooves opening in the blade engaging tace of said carrier and a tongue receiving recess communicating with said undercut grooves and exposing openends thereof and a blade liaifing oppositely extending tongues adapted to enter said recesses and to be moved longitudinally into sliding engagement with said. respective undercut. grooves through said open ends.

fl. Scissors comprising a blade carrier having spaced tongue receiving recesses in its bladeengaging face, a longitudinally extending undercut groove communicating with each of said recesses, and tongues on the lblade positioned Yand adapted to enter said recesses and to be moved longitudinally into sliding engagement with saidV respective undercut grooves through said open ends.

i 5. Scissors Ycomprising a blade carrier Yhaving spaced tongue receiving recesses in its blade engaging face, a longitudinally extending undercut groove communicating with each or jsaid recesses, and tongues on lthe blade positioned and adapted to enter said recesses and to be moved longitudinally into blade retaining engagement With said respective grooves. Y

6. Scissors comprising ja blade carrier having a tongue receiving recess, undercut grooves extending longitudinally or" said carrier and opening into said recess, and a tongue retaining flange overlyingeach of said grooves ando'i' Vprogressively increasing cross sectional area from oneend toward the other of its effective length.

lf/Y-liatevei the varia- 7. Scissors comprising a blade carrier having a tongue receiving recess, undercut grooves extending longitudinally of said carrier and opening into said recess, and a tongue retaining flange overlying each of said grooves and of progressively increasing cross sectional area from said recess toward the other end of its effective length.

8. Scissors comprising a blade carrier having a tongue receiving recess, undercut grooves extending longitudinally of said carrier and opening into said recess, a

tongue retaining flange overlying each of said grooves, and a blade having resilient tongues adapted to engage the under faces of said respective flanges With increasing pressure as the tongues are moved longitudinally along said grooves into effective blade retaining position.

In testimony whereof, I have signed my 2G A. TOVVNSEND YARD.

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