US 3548496 A
Description (OCR text may contain errors)
Dec. 22, 1970 w, VAN HQQK 3,548,496
FILAMENT CLIP SCISSORS Filed July 15, 1968 INVIiNI'UR. ROBERT W. VAN HOOK ATTORNEY United States Patent 3,548,496 FILAMENT CLIP SCISSORS Robert W. Van Hook, Fremont, Ohio, assignor to The Clauss Cutlery Company, Division of Alco, Standard Corporation, Fremont, Ohio, a corporation of Ohio Filed July 15, 1968, Ser. No. 744,875 Int. Cl. B26b 13/04 US. Cl. 30-253 Claims ABSTRACT OF THE DISCLOSURE An end pivoted, spring biased, light weight, clip scissors comprising a pair of blade holding members including stop limit means, and a substantially triangularly interiorly edge grooved recessed seat at its free end for a similar triangularly shaped detachable and replaceable blade held in the seat by a single screw.
SUMMARY OF THE INVENTION This invention deals with a filament such as a thread or a wire, clip scissors having a pair of end pivoted blade holding members or levers and a pivot means which may be a self locking screw. These blade holding levers may be plastic coated for ease of operation and may be die cast of a light material such as aluminum. A resilient means in the form of a helical spring having outwardly extending arms surrounds the pivot means and urges the blade holding members in an open position. Stops means associated with each blade member and located intermediate the ends thereof limit the extent of both the open and closed positions of the blade holding member-s relative to each other. Each blade holding member at its end opposite the pivoted end and on their surfaces and edges facing each other is provided with a triangularly shaped recess having an acute angle inwardly from its open side along the edge of the blade holding member and having a groove along its two inner sides so that its triangular central portion forms a raised seat. Each recess is provided with a similarly substantially triangularly shaped, detachable, flat, hard cutting blade which is held therein by a single holding or fastening means, such as a countersunk screw near the apex of its inner acute angle and through the raised portion of the seat. This single screw attached blade is prevented from angular movement by its flush engagement with the acute angled side walls of the recess provided by the groove along these walls so that no uncut-out corner between the walls and seats will prevent the edge of the blade from completely contacting and wedging against these two walls.
BRIEF DESCRIPTION OF THE VIEWS The above mentioned and other features, objects and advantages and the manner of attaining them are described more specifically below by reference to embodiments of this invention shown in the accompanying drawings, wherein:
FIG. 1 is a side view of a clip scissors constructed in accordance with one embodiment of this invention;
FIG. 2 is an exploded perspective view showing the blade holding members, pivot screw means, spring, stop means, the detachable cutting blades and their holding screw means;
FIG. 3 is an enlarged transverse sectional view, taken substantially along line 33 of FIG. 1, showing the details of the cutting blade and the peripheral groove around the recessed portion of the blade holding members;
FIG. 4 is an enlarged transverse sectional view, taken 3,548,496 Patented Dec. 22, 1970 DESCRIPTION OF THE PREFERRED EMBODIMENTS Generally speaking the clip scissors of this invention comprises a pair of end pivotally-connected 10 or 20', hand manipulated blade holding levers 30 and 50, each mounting an identical removable cutting blade 70 at its free end. In a structural form of this kind, these levers 30 and 50 preferably are die cast from a light metal so as to make them lighter in weight than conventional steel scissors, easier to manufacture, and at the same time suificiently strong. These levers 30 and 50 may be plastic coated thus rustproofing them and also making them self lubricating for easier operation.
Referring to FIGS. 1 and 2 of the drawings, a first blade holding member or lever 30 and second blade holding member or lever 50 having an outwardly projecting finger loop 55 intermediate its ends, are pivotally connected together adjacent one of their ends by a pivot means or screw 10. The outer or free ends of these levers 30 and 50 are arced to a point on one side and bevelled and slightly angled to that point on the other side.
The head of the pivot screw 10 fits in a stepped recessed ferrule 11, see FIG. 4, which acts as a harder bearing for the oscillations of the pivot than the die cast pivot hole 51 in the member 50. The pivot screw 10 is provided with an outer threaded end portion 12 and an intermediate plain pivot portion 14 which is journalled in the ferrule 11. The threaded portion 12 of the screw 10 is secured to a threaded locking ferrule 16 disposed in and secured to the pivot hole 31 in the member 30. This locking ferrule 16 is internally threaded to receive the portion 12 of the screw 10 and has at its outer end a plastic insert 18 for frictionally holding the screw 10 in its adjusted position. Instead of a self-locking ferrule or nut 16 for the screw 10, there may be used a self-locking pivot screw 20 as shown in FIG. 5 which has near its outer threaded end a plastic insert or radial plug 22 which frictionally engages an internally threaded ferrule 24 secured in the pivot hole 31 of the member 30.
As shown more particularly in FIG. 2, the inside of the pivot hole 31 in the lever 30 is formed with a tear drop shaped socket 32 pointing toward the free end of the lever or member 30. This socket 32 is adapted to overlie and complement a similar tear drop shaped socket 52 in the companion lever or member 50.
A helical spring 35 having at least one convolution, is positioned in the tear drop shaped sockets 32 and 52 (see FIGS. 4 and 5) and around the shank of the pivot screw 10 or 20. Spring arms 36 and 3-7 project tangentially from the convolution; one at each end thereof, starting substantially diametrically opposite one another, and preferably also diverging relatively outwardly with respect to each other both axially and from the plane of the spring convolution, so that these arm-s 36 and 37 positively engage one of the straight sides of each tear drop socket 32 and 52. This helical spring 35 is wholly concealed and protected by the levers 30 and 50. The energy of this spring 35 is such that it will inherently seek to move the levers 30 and 50 to an angularly outstretched position as shown in FIG. 1. Also, this particular arrangement requires that the spring arms 36 and 37 be moved angularly together to bring them in alignment when the levers 30 and 50 are moved to their closed position.
A relatively narrow elongated tapered or segment shaped projection or abutment 38 may be carried by one of the levers, for instance the first lever 30, in a position to occupy a wider elongated tapered or segment shaped stop socket 58 provided in the inner face of the companion lever 50; the width of the socket 58 being substantially greater than the width of the abutment 38 by an amount preselected to limit the relative angular movement of the levers and 50 in both opening and closing movements.
The free end of each lever 30 and 50 is provided with a triangular shaped cut-out or recessed portion and 60, respectively, in its inner face adjacent its longitudinal bevelled edge opposite the arced portion, and which forms a cutting blade recess, seat, or pocket. Each recess 40 and 60 extends from the forward tip of the free end of each lever 30 and respectively, to a point rearwardly at about where the straight edges of the two levers meet and the bevel starts, when they are in their open assembled position as shown in FIG. 1. As shown in FIGS. 1 and 2 each triangular recess 40 and has an acute angle apex 41 and 61 spaced toward the pivot from both the pointed end and the start of the bevel on each lever 30 and 50. Thus the angle 42 and 62 of the triangular recesses 40 and 60 at the start of the bevel is greater than 90 or is an obtuse angle. The two inner converging side walls 44 and 46 and 64 and 66 of the recesses 40 and 60 which meet at the apieces 41 and 61 are provided with i inner or deeper grooves 47 and 67 respectively, to form a raised central triangular seat portion 48 and 58 in each recess 40 and 60 (see also FIG. 3).
Cutting blades 70, as most clearly shown in FIG. 2, are triangularly shaped to conform with the cut-out or recess portions 40 and 60 at the free ends of the levers 30 and 50, and provide bevelled or cutting edges 72 extending a slight distance beyond the open side of the cut-out portions, so that the blades can overlap, as is required for effective cutting. The two acute angled sides 74 and 76 of each blade abut and wedge closely arcuately into the sides 44 and 46 and 64 and 66 of the recesses 40 and 60, and the thickness of these blades is substantially the same as the depth of these recesses to their raised central portions 48 and 68.
Each blade 70 is formed with a small countersunk aperture 79 registering with similar apertures 49 and 69 in the central raised portions 48 and 68 adjacent the apices 41 and 61. These apertures 49 and 69 may be provided with internally threaded and securely attached ferrules 80 into which flat headed screws or fasteners 81 may be threaded to removably afiix the blades 70 in their seats 40 and 60.
While there is described above the principles of this invention in connection with specific apparatus, it is to be understood that these descriptions are made by way of examples and not as a limitation to the scope of the invention.
1. In a clip scissors comprising:
(a) a pair of end pivoted blade holding members, each member having a triangular recessed seat at its free end; each of said triangular recessed seats having its Cir inner two sides converging to an acute angle opposite its open side along the adjacent edges of said members, and having a raised central portion spaced from said two sides,
(b) a detachable complementary triangular blade supported by the raised central portion of each said seat and bearing against said two sides; and
(c) a single fastening pin means in each said raised central portion for detachably securing each said blade in its respective seat.
2. A clip scissors according to claim 1 wherein one of said holding members has a finger loop intermediate its ends.
3. A clip scissors according to claim 1 wherein said pivoted holding members have a resilient means for urging said members apart about their pivot.
4. A clip scissors according to claim 1 wherein said pivoted holding members have a stop means between them for limiting their angular spread.
5. A pair of clippers comprising:
(a) a first lever member,
(b) a second lever member having a finger loop intermediate its ends,
(c) a pivot means connecting said lever members adjacent one end of each member,
(d) resilient means between said members adjacent said pivot means for urging said lever members apart angularly about said pivot,
(e) stop means between said lever member intermediate their ends for limiting the angular spread apart of said lever members,
(f) acute angled substantially triangularly shaped recessed portions at the free ends and adjacent edges of each lever member, said portions facing each other between said members, and having grooves around their acute angled edges interiorly of the outside peripheral edge of said members,
(g) replaceable triangularly shaped blades seated in said recessed portions and having cutting edges exposed along the open side of said recessed portions, and
(h) separate single screws for holding each blade in its recessed portion.
References Cited UNITED STATES PATENTS 342,129 5/1886 Paxton 30-253 566,830 9/1896 Wiget 30-349 2,597,519 5/1952 OBrien 30-253 3,453,651 7/1969 Wertepny 30-253 ROBERT C. RIORDON, Primary Examiner J. C. PETERS, Assistant Examiner US. Cl. X.R. 30-349