US3611962A

US3611962A - Crevice guard for horizontally disposed rotary sewing hook

Info

Publication number: US3611962A
Application number: US50818A
Authority: US
Inventors: Samuel Armao
Original assignee: Individual
Current assignee: Individual
Priority date: 1970-06-29
Filing date: 1970-06-29
Publication date: 1971-10-12
Anticipated expiration: 1988-10-12

Abstract

A crevice guard for covering the crevice between the hook piece and hook body of a horizontally disposed rotary sewing hook to prevent the thread from becoming caught in the crevice and torn or interrupted in its movement during a stitching cycle.

Description

United States Patent [72] Inventor Samuel Armao [56] References Cited 447 S. Fifth 51., Reading, Pa. 19602 UNITED STATES PATENTS 1 988 789 1/1935 Grieb 112/228 x 122] Filed 1970 2 209 906 7 1940 R b 1 1 2 22s 45 Patented Oct. 12, 1971 l 2 2,435,358 2/1948 Kessler... 112/228 2,716,956 9/1955 Parry 112/230 3,223,060 12/1965 Corey 112/228 Primary ExaminerA1fred R. Guest 541 CREVICE GUARD FOR HORIZONTALLY Ammekshmmaker DISPOSED ROTARY SEWING HOOK 7 Claimsfinrawmg Flgs' ABSTRACT: A crevice guard for covering the crevice [52] 11.5. C1 112/228 between the hook piece and hook body of a horizontally [51] 1nt.C1 D05b 57/14 disposed rotary sewing hook to prevent the thread from [50] Field of Search. 1 12/228, becoming caught in the crevice and torn or interrupted in its 230 movement during a stitching cycle.

PATENTED 0m 1 219m 3611.962

FIG. I. F/6.Z.

(PRIOR ART) INVENTOR SAMUEL ARMAO ATTORNEYS CREVICE GUARD FOR HORIZONTALLY DISPOSED ROTARY SEWING HOOK BACKGROUND OF THE INVENTION This invention relates generally to horizontally disposed rotary sewing hooks of the type used in lockstitch sewing machines.

Prior art horizontally disposed rotary sewing hooks have a crevice or gap between the hook piece and the hook body of the tdtary sewing hook in which the thread frequently becomes snagged or torn as it passes upwardly from the bobbin held in the hook body as the hook body rotates during a stitching cycle. This snagging or interference with the movement of the thread during a stitching cycle results in uneven or improper stitches and frequently the thread is broken, necessitating shutdown of the machine in order to rethread the device resulting in loss of working time and increased production costs due to the loss of production time and the fact that a paid mechanic or operator must be employed to rethread the machine. Further, articles being stitched in the machine are caused to be improper or imperfect due to faulty stitches caused by snagging of the thread.

The present invention provides a simple and economical guard over the crevice in horizontally disposed rotary sewing hooks to prevent the thread from becoming snagged or torn therein, thus significantly reducing loss of time and operating expenses frequently occurring in prior art machines which do not have any means for covering or guarding the crevice in the rotary sewing hook.

OBJECTS OF THE INVENTION It is an object of this invention to provide a rotary sewing hook having a crevice guard placed over the crevice or gap between the hook piece and the hook body to prevent thread from becoming snagged or torn therein.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a side view in elevation of a prior art rotary sewing hook showing the crevice between the hook piece and hook body.

FIG. 2 is an exploded side elevational view of a first modification of the invention showing the crevice guard on the hook piece extended into a slot in the hook body and covering the crevice.

FIG. 3 is an exploded side view in elevation of a second modification of the invention showing the crevice guard on the hook piece and extended over the crevice onto a sloping surface on the hook body.

FIG. 4 is a side view in elevation of a third modification of the invention showing the crevice guard attached to the castoff piece and extended over the crevice onto the hook piece.

FIG. 5 is a perspective view of the crevice guard which is affixed to the castofi piece in the embodiment illustrated in FIG. 4.

FIG. 6 is a top perspective view of the embodiment illustrated in FIG. 3, illustrating the manner in which the crevice guard overlies the crevice between the hook piece and hook body.

DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawings wherein like reference numerals refer to like parts throughout the several views, a conventional horizontally disposed rotary sewing hook is indicated generally at 1 in FIG. 1. The rotary sewing hook comprises a hook body 2 and a hub portion 3 whereby the rotary sewing hook may be affixed to a rotary hook shaft (not shown) by means of the setscrews 4. A generally semicircular thread retainer or hook piece 5 is affixed to the outer sidewall on one side of the hook body by means of screws 6 and a generally semicircular castoff piece or gib 7 is affixed to the opposite outer sidewall of the hook body by means of screws 8. As

clearly illustrated in this figure, a crevice or gap 9 is left between the hook piece 5 and the hook body 2 and in operation, a thread passing upwardly from a bobbin case holder (not shown), normally disposed in and carried by the rotary sewing hook, tends to become caught or snagged in the crevice thus causing improper stitches to be made and frequently necessitating shutting down of the machine.

Referring now to FIG. 2, a first modification or form of the invention is depicted and comprises an elongated narrow lip or extension 10 welded at one end 10a into a shallow notch or recess 11 formed in the marginal edge portion of the hook piece 5 and extending at its other end 10b into a short notch or slot 12 in the hook body 2. The lip or extension 10 constitutes a crevice guard effectively covering the crevice 9 thus preventing thread from being caught therein. The castoff piece or gib 7 is removed from the hook body in these figures so that the relationship of the extension 10 and slot or notch I2 in the hook body can be seen.

Referring now to FIGS. 3 and 6, a second modification of the invention is illustrated and is similar to the embodiment il- Iustrated in FIG. 2. In this modification, the lip or extension comprises a relatively narrow elongated member I0 having one end 10a welded in a shallow notch or recess 11 in the hook piece 5 as in the previous embodiment. In this modification, however, the end 10b of the extension is upwardly inclined and rests in mating abutting relationship on a sloping surface 13 on the hook body 2 rather than being extended into a slot or notch 12 as in the previous embodiment. The castoff piece or gib 7 is shown removed in this figure also in order that the relationship of the extension 10' with the crevice 9 and sloping surface 13 on the hook body may be clearly seen. Referring now to FIGS. 4 and 5, a third modification of the invention is illustrated and comprises an irregularly shaped plate or member 14 having a narrow elongate extension 15 on one side thereof welded or otherwise secured to the castoff piece or gib 7 as at W with the extension 15 extended over the slot or crevice 9 and resting in flat abutting relationship on the edge of hook piece 5. The plate 14 is ground or otherwise formed so as to define a smooth configuration with the outer surface of the castoff piece 7 and is substantially flush therewith in the vicinity of the weld W so as not to present any uneven surfaces on the rotary sewing hook.

The present invention thus provides a simple and effective crevice guard for covering the crevice between the hook piece and hook body of a rotary sewing hook to prevent thread from becoming snagged or torn in the crevice during a stitching cycle of the rotary sewing hook.

As this invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, the present embodiment is therefore illustrative and not restrictive, since the scope of the invention is defined by the appended claims rather than by the description preceding them, and all changes that fall within the metes and bounds of the claims or that form their functional as well as conjointly cooperative equivalents, are therefore intended to be cmbraced by those claims.

I claim:

I. A horizontally disposed rotary sewing hook for lockstitch sewing machines comprising a hook body having a hook piece secured thereto and slightly spaced at one end from the hook body to define a relatively narrow gap or crevice between the hook piece and the hook body, and crevice guard means fixed to said rotary sewing hook in overlying relationship with said crevice to prevent thread from being snagged or caught in said crevice during a stitching cycle of said rotary sewing hook.

2. A horizontally disposed rotary sewing hook as in claim I, wherein said crevice guard means is fixed to said hook piece adjacent said crevice and comprises an extension on said hook piece extended over said crevice.

3. A horizontally disposed rotary sewing hook as in claim 2, wherein said crevice guard means comprises a relatively narrow elongate lip or extension fixed to a marginal edge portion of said hook piece and extended over said crevice.

4. A horizontally disposed rotary sewing hook as in claim 3, wherein said crevice guard means is welded at one end to said hook piece and extends at its other end generally circumferentially away from said hook piece over said crevice and into a slot formed in said hook body 5. A horizontally disposed rotary sewing hook as in claim 3, wherein said crevice guard means extends generally circumferentially away from said hook piece and is upwardly inclined at one end portion thereof and rests in mating abuttingrelationship at said one end portion on a sloping surface on said hook body.

6. A horizontally disposed rotary sewing hook as in claim 3, wherein a castoff piece is fixed to said hook body adjacent said hook piece and said crevice guard means is fixed to said castoff piece.

7. A horizontally disposed rotary sewing hook as in claim 6, wherein said crevice guard means is fixed to an end portion of said castoff piece and includes a relatively narrow elongate lip extended away from said castoff piece toward said hook piece in overlying relationship to said crevice.

Claims

1. A horizontally disposed rotary sewing hook for lockstitch sewing machines comprising a hook body having a hook piece secured thereto and slightly spaced at one end from the hook body to define a relatively narrow gap or crevice between the hook piece and the hook body, and crevice guard means fixed to said rotary sewing hook in overlying relationship with said crevice to prevent thread from being snagged or caught in said crevice during a stitching cycle of said Rotary sewing hook.

2. A horizontally disposed rotary sewing hook as in claim 1, wherein said crevice guard means is fixed to said hook piece adjacent said crevice and comprises an extension on said hook piece extended over said crevice.

4. A horizontally disposed rotary sewing hook as in claim 3, wherein said crevice guard means is welded at one end to said hook piece and extends at its other end generally circumferentially away from said hook piece over said crevice and into a slot formed in said hook body.

5. A horizontally disposed rotary sewing hook as in claim 3, wherein said crevice guard means extends generally circumferentially away from said hook piece and is upwardly inclined at one end portion thereof and rests in mating abutting relationship at said one end portion on a sloping surface on said hook body.