| US1922370A | 1933-08-15 | |||
| SE186196C1 | ||||
| US3635277A | 1972-01-18 | |||
| US2097242A | 1937-10-26 |
| 1. | A spring attachment member ( 1 ) for securing a door balancing spring (2) which is coiled about a shaft (3), c h a r a c t e r i z e d in that at least one (2A) of the ends of the spring (2) is arranged to be secured to a split, twopiece spring attachment mem¬ ber (1) enclosing the spring shaft (3), one attachment member part { 1 ) being slidable in the lengthwise direc¬ tion (67) of the shaft as well as being arranged to turn (89) about said shaft (3), and in that the second,. |
| 2. | complementary attachment member part ( 1 ) is arranged for sliding movement in the lengthwise direction (67) of the shaft (3) but is nonrotationally mounted thereon, said two attachment member parts (1 1, 12) arranged to be securely interconnected. 2. A spring attachment member as claimed in claim1 c h a r a c t e r i z e d in that the attachment member parts (1 1, 12) are discshaped, one ( 11 ) of said attachment member parts having a circular hub opening 2 whereas the second attachment member part ( 1 ) is formed with a central opening (13) of irregular configuration. |
| 3. | A spring attachment member as claimed in claim 2, wherein said spring shaft (3) has a polygonal peripheral configuration, e.g. a hexagonal configuration, c h a ¬ r a c t e r i z e d in that the central opening (13) 2 of said second attachment member part ( 1 ) has a peri¬ pheral configuration matching that of the spring shaft (3). |
| 4. | A spring attachment member as claimed in any one of the preceding claims, c h a r a c t e r i z e d therein that the central portion (14) of said first 1 attachment member part (1 ) is arranged to be fitted onto a bearing means of complementary configuration projecting in the axial direction (7) from said second 2 attachment member part (1 ) . |
| 5. | A spring attachment member as claimed in any one of the preceding claims, c h a r a c t e r i z e d therein that the two attachment member parts (1 1, 12) are formed respectively with a throughhole (10) and with a threaded hole (11) for reception in said holes of attachment bolts (12) serving to join the two attach ment member parts (1 1, 12) together for the purpose of orming an attachment member ( 1 ) which is nonrota tiσnally secured to the spring shaft (3) but may be displaced in the longitudinal direction (6, 7) of said shaft. |
| 6. | A spring attachment member as claimed in any one of the preceding claims, c h a r a c t e r i z e d therein that the first attachment member part ( 1 ) is formed with reception means (21) designed in conformity with a manually actuable turning element (20), said reception means (21) being e.g. a number of apertures (21) adapted for reception therein of a lever (20). |
| 7. | A spring attachment member as claimed in claim 6, c h a r a c t e r i z e d in that a plurality of lever reception apertures (21) are distributed along the cir cumference of the first attachment member part (1 ) . |
| 8. | A spring attachment member as claimed in any one of the preceding claims, c h a r a c t e r i z e d therein that a bolt joint (22) secures the spring (2) to the first attachment member part (1 ) . |
The present invention concerns a spring attachment member for securement of a door balancing spring which is coiled about a shaft.
The main purpose of the present invention is prima- rily to provide a spring attachment member which is arranged in such a manner as to allow the door balancing torsional spring/springs to be tensioned upon downwards movements (closing) of the door.
This purpose is achieved in accordance with the invention with the aid of a spring attachment member which is characterized in that at least one of the ends of the spring is arranged to be secured to a split two- piece spring attachment member enclosing the spring shaft, one attachment member part being slidable in the lengthwise direction of the shaft as well as being arranged to turn about said shaft, and in that the second, complementary attachment member part is arranged for sliding movement in the lengthwise direction of the shaft but is non-rotationally mounted thereon, said two attachment member parts arranged to be securely interconnecte .
One preferred embodiment of the invention will be described in closer detail in the following with reference to the accompanying drawings, wherein Fig. 1 shows a spring attachment member and the associated spring in a disconnected, pre-assembly posi¬ tion.
Fig. 2 illustrates the spring attachment member in the tightened assembly position, and Fig. 3 illustrates the attachment member in its fully mounted position, the alternative displaced posi¬ tion of the attachment member being shown in broken lines.
The subject invention concerns a spring attachment
member 1 for a door balancing spring 2 which is coiled about its associated door spring shaft 3, one end 3A of said spring being non-rotationally secured to a cable drum 4 on which drum 4 is wound a cable 5 which is attach- ed to a door. The door is guided for movement along tracks extending alongside the opening to be closed by the door.
In accordance with the teachings of the invention one end 2A of the spring 2 which preferably is of the helically wound type, is arranged to be attached to a split, two-piece spring attachment member 1 which encloses the spring shaft 3. One attachment member part
1 1 of the attachment member 1 , which part is intended to be attached to the spring 2 and to be positioned next to said spring, is mounted on the shaft 3 in such a manner as to be displaceable along said shaft 3 in the directions indicated by arrows 6, 7. In addition, this attachment member part 1 is mounted for rotational movement atbout the shaft 3 in the direction indicated by arrows 8-9.
2 The second complementary attachment part 1 of the two-piece attachment member 1 is mounted on the shaft 3 for movement in the longitudinal directions thereof indicated by arrows 6-7. However, this second
2 attachment member part 1 is non-rotationally attached to the shaft 3 and consequently these two components turn together as one single unit.
In accordance with the teachings of the invention the two attachment member parts are interconnectable, for example by means of non-threaded through-holes 10 formed in e.g. the second attachment member part V and threaded holes 11 formed in the other attachment member part 1-, and by means of threaded attachment bolts 12 arranged to be received in the respective holes 10, 11 so as to form an integrated spring attachment member 1 which is non-rotationally secured to the spring shaft 3 but displaceable in the longitudinal directions
6-7 of the shaft 3.
Preferably, the two attachment member parts 1 , 2 1 are disc-shaped, presenting e.g. a circular circum¬ ferential configuration, with the first attachment mem- ber part 1 having a circular central opening to allow free rotational movement of said attachment part in coupling position I around the spring shaft 3 whereas
2 the second attachment member part 1 has a central open¬ ing 13 of irregular configuration in order to be turned together with and by said spring shaft 3. Preferably, the central opening 13 of said second attachment member
2 part 1 has a circumferential configuration which essen¬ tially matches the shape of the spring shaft 3. The spring shaft 3 may for instance have a non-round configα- ration or a polygonal circumferential configuration, such as a hexagonal shape, in which case the central opening 13 has a configuration matching that of the spring shaft 3, i.e. the central opening 13 has a con¬ gruent hexagonal configuration. The hub portion 14 of the first attachment member part 1 is arranged to receive a bearing means of comple¬ mentary configuration projecting in axial direction
2 from the second attachment member part 1 .
The second end 2B of the spring 2 may be attached to a similar attachment member to that described in the aforegoing or to a conventional attachment member 15, for instance of the kind illustrated in the drawing figures and comprising a disc-shaped attachment member part 16 to which the spring 2 is secured by means of a screw 17 and which attachment part 16 is arranged for securement in a wall-mounted bracket 18 which by means of screws 19 is fastened to the intended mounting place.
Attachment member part 1 of the intended two-piece spring attachment member 1 is formed with reception means 21 designed in conformity with a manually actuable turning element 20. The reception means may be e.g.
a number of apertures 21 adapted to receive one end 20A of a lever 20. Preferably, a plurality of lever receiv¬ ing apertures 21 are distributed along the circumference ι of the associated attachment member part 1 . Finally, the spring 2 is secured to the attachment
1 member part 1 by means of a bolt joint 22.
How the spring attachment member in accordance with the invention functions should be apparent from the aforegoing and from a study of the drawings. Briefly, the entire spring unit 23 is lifted as one single piece to the intended position of use to be secured in that position by means of screws. At this stage the spring 2 is in its untensioned, unloaded coupling position I, in which its one spring end 2A is attached to the attach- ment member part 1 . By means of the lever 20 said attach¬ ment member part 1 is turned in the rotational direction 9 to tension the spring 2 in such a manner that the latter obtains the correct desired spring tension, where¬ upon the attachment member part 1 and the second attach-
2 ment part 1 are jointed together by means of screws, said second attachment member part being rotated together with the spring mounting shaft 3 which is interconnected with the wire drum 4. Consequently, the spring 2 need not be tightened before the door hoisting cable 5 is secured to the door in its intended position.
In the interconnected position II of the attachment member 1 the latter is freely displaceable in the hori¬ zontal directions 6-7 in dependence on the amount of extension and contraction, respectively, of the spring 2 in the various setting positions thereof.
The invention is not limited to the embodiments described in the aforegoing and illustrated in the draw¬ ings but various modifications are possible within the scope of the appended claims.