Патент USA US2110710код для вставки
March 8, 1938; H, K_ LORENTZEN 2,110,710 VENETIAN BLIND TILTER Original Filed April 4, 1935 . INVENTOR ' Ham?”. Lmwztzem 2,110,710 Patented Mar. 8, 1938 ' UNITED, STATES PATENT ‘OFFICE 2,110,710 ‘ VENETIAN BLIND TILTER. Hans‘K. Lorentzen, Montclair, N. J. Original application April 4, 1935, Serial No. 14,557. Divided and this application October 15, 1936, Serial No. 105,688 8 Claims. This invention relates to hardware to be in corporated in Venetian blinds, and more par ticularly to a mechanism for changing the in clination of the slats of the blind. Originally 5 the subject-matter was presented in myprior application, Serial No. 14,557, ?led April ‘1, 1935 (Patent No. 2,075,214, March 30, 1937), of which application this is a division. An object of the invention is to-provide tilt 10 ing mechanism which can be economically and satisfactorily fabricated, largely from stamped sheet metal, on a quantity production basis. Another object of the invention is to provide a Venetian blind tilter which will be attractive 15 in appearance and rugged and reliable in service. Various speci?c objects of the invention will , , (Cl. 156-47) left hand end of the bar I, but if 'it is to be placed at the right hand end of the bar, the construction of the mechanism is the same except that it is made of the opposite hand. The tilter includes an angle bracket 2 which GI depends from the suspension bar I and to which is pivoted a U-shaped rocking member 3 that is adapted to have connected to it the top or tilt slat 4 of the blind. Integral with the U-shaped rocking member 3 is a gear sector portion 6 that 10 is operated by a worm ‘I, driven from a pulley 8 and a cord 9. While any suitable form of worm may be used, the worm shown is stamped from a disc of sheet metal. After the worm has been formed, it is riveted to one end of a shaft I0 15 disclosure herein of an illustrative preferred em ‘and the shaft is slipped into a brass bushing II. The pulleyil may be of any suitable form but as shown it is composed of two coned sheet metal bodiment of the invention. ' discs 83 and 81’. be apparent to those skilled in the art from the , Fig. I is a vertical section through the suspen 20 sion bar of a Venetian blind, showing in side ele vation tilting mechanism of the present inven tion attached to the suspension bar. Fig. II is a fragmentary rear elevation showing 25 the tilter attached to the suspension bar and the top slat of the blind attached to the tilter. Fig. III is a fragmentary horizontal view taken in general on the line III-III of Fig. I, with a fragment of the top slat of the blind added to 30 the structure shown in Fig. I. ‘ Fig. IV is a fragmentary vertical section taken in general on the line IV-—'IV of Fig. I, with a fragment of the top slat of the blind added to the structure shown in Fig. I. Fig. V is a horizontal detail view, partially in 35 section, showing the gear sector and worm illus trated in Fig. I. _ Fig. VI is an isometric view showing an end of the top slat of the blind, with a modi?ed form After the shaft I0 has been placed in the bushing II, the pulley 8 is suitably secured to the free end of the shaft, as by rivet mg. The depending leg of the bracket 2 is formed with an opening 2*‘, for accommodation of the worm 'l', and with a horizontal partly cylindrical portion l3. f The bushing II, with the gear and pulley attached thereto as previously described, is assembled with the angle bracket 2, the gear , 1 extending in the-opening 2a and the bushing ll lying in depression l3. The bushing may be fastened in this position by means of a metal strap l4 which ?ts into a circumferential groove He formed in the bushing l I, the ends of the strap being passed through slots in the bracket 2 and having their ends bent outwardly against . the face of the bracket as shown in Fig. IV. The U-shaped rocking member 3 is pivoted to the lower end of bracket 2 by means of a ventional construction and hence the blind it brass bearing pin H which is riveted to bracket 2 and which engages only the inner leg of the U-shaped rocking member. The outer leg of the U-shaped rocking member is appropriately formed to receive a coupling member carried. by self is not disclosed herein. The blind may be the top or tilt slat of the Venetian blind; and as 40 of attaching member. The tilter, or tilting mechanism, is intended to be used with a Venetian blind of well known con 45 supported from/the top of a window frame, but ordinarily it is supported from a suspension bar I which is fastened adjacent to the top of the window and carries pulleys and cords (not shown) for raising and lowering the blind. At present, 50 it is the usual practice to place the tilter of Fig. I at the left hand end of the suspension bar (the bar being viewed from within the room) but occasionally, the tilter is placed at the-right hand end of the bar. In the disclosure herein, it 55 will be assumed that the tilter is placed at the shown, this rocking member is formed to receive either of two forms of couplings. ‘In Figs. II, III, and IV, the top or tilt slat 4 of the blind is pro vided with a pair of coupling pins I8, I 8 which are adapted to be inserted in holes 3“, 3“ in the rocking member. As shown in Fig. VI, the top or tilt slat 4 of the blind is provided with a stamped metal ?tting l9 having a ?at tongue end l9"L which may be'inserted into the slot 3'" of-the U-shaped rocking member. The side of. the U-shaped rocking member 55 2 2,110,710 which lies against the bracket 2 has its upper edge formedsemi-circularly and cut to form gear teeth 6“. In order to widen the gear teeth, for one end of the shaft and extending into the opening, the other end of the shaft carrying an purposes that will be explained hereinafter, a semi-circular plate 6' is formed with teeth simi having one side of the U formed with a curved upper edge out with gear teeth, the rocking member being pivoted to the bracket with the gear teeth cooperating with the worm wheel. lar to the teeth 5“; and plate 6' is positioned against the portion 6 of the rocking member with the teeth on the two members slightly in echelon as shown in Fig. V. The parts 6 and 6' are per 10 manently secured together in this relationship, preferably by spot welding. By the use of plate 6’, the thickness of the gear teeth is doubled, while permitting the parts to be made from a weight of sheet metal that is easy to cut and stamp. When a stamped sheet. metal worm is used there is only a slight cir cumferential overlap of the two ends of the worm thread, and it is helpful to have double thick teeth on the rocking member 3 in order 20 to insure engagement of the worm with one tooth before the worm has disengaged from the preceding tooth. The formation of the gear teeth by two plates also permits the stepped arrange ment illustrated in Fig. V, which enables the 25 gear sector to cooperate more favorably with the slanting pitch of the worm. It is well known that in the usual stamping operations the un der side of the cut is left with a sharp edge. By so stamping the parts 6 and 6' that the sharp 30 edges are on the meeting surfaces of the two parts when assembled, the outer corners of the teeth -on both faces of the complete rocking member 3 are relatively smooth for cooperation with the worm. 35 With an adequate circumferential overlap of the two ends of the thread of the worm, it is feasible to omit the plate 6' and use only the single thickness gear formed on portion 6 of the U-shaped rocking member 3. However, the 40 double thickness gear form has been disclosed, as it is the best form known to me for use with a stamped sheet metal worm. In operation, motion imparted to cord 9 causes the concurrent rotation of pulley 8, shaft l0, 45 and worm ‘I. As the worm 1 rotates, it imparts rotarymovement to the rocking member 3 with the result that the top slat 4 of the blind is tilted. As is well understood in the art, the top slat is articulated with the other slats of the blind by means of a ladder tape or the like (not shown) so that all slats in the blind are tilted simul taneously upon the tilting of the top or tilt slat 4. In compliance with the patent statutes I have 55 disclosed the best form in which I have con templated applying my invention, but it is to be understood that the disclosure herein is to be considered as illustrative and not limiting the scope of the invention. 60 I claim: 1. A,Venetian blind ?tting comprising a brack et, a worm wheel mounted on the bracket, a U shaped rocking member formed of sheet metal, one leg of the U-member having a curved edge formed with gear teeth and pivoted to the brack et, a plate welded to the toothed leg of the rock ing member and formed with teeth correspond ing to the teeth of the rocking member. 2. A Venetian blind ?tting comprising an an 70 gle bracket having a vertical branch and a hori zontal branch, the vertical branch being formed with a partly cylindrical horizontal depression and with an opening extending across the de pression, a bushing secured in the depression, a shaft in the bushing, a worm wheel secured to .75 operating device, a U-shaped rocking member 3. A tilter for Venetian blinds comprising a sheet metal angle bracket having a horizontal leg to be attached to a support for suspending the bracket and a vertical leg depending from the horizontal leg, the vertical leg being formed with an opening and a horizontal groove extending on opposite sides ‘of the opening, a shaft and worm assembly positioned adjacent to said groove 15 with the worm in said opening, a shaft-securing member of sheet metal, lying adjacent to said shaft and affixed to said vertical leg, a gear pivoted to said vertical leg and meshing with said worm, and means integral with said gear 20 to engage the tilt slat of a Venetian blind. 4. A tilter for Venetian blinds comprising a sheet metal angle bracket having a horizontal leg to be attached to a support for suspending the bracket and a vertical leg depending from the horizontal leg, the vertical leg being formed with an opening and a horizontal groove extending on opposite sides of the opening, a shaft and worm assembly positioned adjacent to said groove with the worm in said opening, a shaft-securing mem 30 ber of sheet metal, lying adjacent to said shaft and affixed to said vertical leg, and a U-shaped member pivotally attached to said vertical leg of the bracket, one side of such U-shaped member being formed with gear teeth meshing with said 35 worm and the other side being formed for en gagement with the tilt slat of a Venetian blind. 5. A tilter for Venetian blinds comprising a sheet metal bracket having a groove pressed therein, a shaft, a worm on one end of the shaft, 40 9. driving member on the other end of the shaft, a bushing on the shaft between the worm and the driving member, said bushing being posi tioned in said groove in the bracket, and the bushing having an exterior circumferential 45 groove, and a metal strap lying in said circum ferential groove, said strap being secured to said bracket to hold the bushing in assembled rela tion with the bracket. 6. A tilter for Venetian blinds comprising a 50 sheet metal bracket having a groove pressed therein, a shaft, a worm on one end of the shaft, a driving member on the other end of the shaft, a bushing on the shaft between the worm and the driving member, said bushing being positioned in , said groove in the bracket, and the bushing hav ing an exterior circumferential groove, and a metal strap lying in said circumferential groove, the ends of the strap being passed through slots in said bracket and being clinched against the opposite side of the bracket to hold the bushing in assembled relation with respect to the bracket. '7. A tilter for Venetian blinds comprising a sheet metal bracket, a worm mounted. on said 65 bracket, a U-shaped sheet metal rocker having one leg thereof positioned adjacent to said brack et ‘and formed with teeth meshing with said worm, a sheet metal member positioned against said leg of the U-shaped rocker, and a pivot 70 pin passing through said sheet metal member, said leg of the U-shaped rocker, and said bracket. 8. A tilter for Venetian blinds comprising a sheet metal angle bracket having a horizontal leg for attachment to a support, and having a 76 2,110,710 depending vertical leg, the vertical leg having a horizontal groove pressed therein, a bushing posi tioned in said groove, said bushing having an ex ternal circumferential groove, a metal strap en gaging the grooved portion of the bushing, the ends of the strap being passed through holes in said vertical leg of the bracket and being clinched on the opposite side thereof to secure the bushing ' 3 in assembled position, a shaft journalled in the bushing, means to rotate the shaft, a worm on the shaft, and a sheet metal rocker member pivoted to the depending leg of the bracket, the rocker member having teeth meshing with said worm. HANS K. LORENTZEN.