Speed adjusting device for a drill press

Details Speed adjusting device for a drill press Speed adjusting device for a drill press

1999-06-11

2001-03-20

Lorence, Richard M. (Department: 3681)

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

By manual actuator for one or both confronting members

C408S128000, C116S233000, C116S298000

Reexamination Certificate

active

06203458

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a speed adjusting device for a drill press. The device adopts a pressing device connected to the variable pulley on the output shaft so as to adjust a gap between the two disks of the variable pulley to adjust an effective diameter of the belt in the variable pulley. The pressing device is located beside the user.
BACKGROUND OF THE INVENTION
A conventional speed adjusting device for a drill press is shown in
FIGS. 1 and 2
wherein a driving shaft (
100
) of a motor (
10
) has a first variable pulley mounted thereto which is composed of two first disks (
14
), and an output shaft (
11
) has a second variable pulley mounted thereto which is composed of two second disks (
18
), and a belt (
16
) rotatably reeves between the first variable pulley and the second variable pulley. Each of the first disks (
14
) and the second disks (
18
) has an inclined surface so that the belt (
16
) is movably between the two inclined surfaces of the two first disks (
14
) or second disks (
18
). That is to say, the effective diameter of belt (
16
) in the first variable pulley (
14
) and the second variable pulley (
18
) is adjustable. A cap (
13
) is threadedly mounted to the top of the driving shaft (
100
) so as to adjust the gap between the two first disks (
14
), and a spring (
17
) is mounted to the output shaft (
11
) so as to exert a force to the second disks (
18
). A drilling bit (
12
) is connected to the lower end of the output shaft (
11
) so as to drill an object. Because the cap (
13
) is connected to the driving shaft (
100
) which is located away from the user as shown in
FIG. 2
, so that when the user wants to operate the cap (
13
) to reduce or increase the gap between the two first disks (
18
), he/she has to leave his/her seat to operate the cap (
13
). If the gap between the first disks (
14
) are reduced, the effective diameter of the belt (
16
) in the first variable pulley is increased, and the effective diameter of the belt (
16
) in the second variable pulley (
18
) is then reduced, so that the speed of the output shaft (
11
) is increased. Whenever, the user wants to adjust the speed of the output shaft (
11
), he/she has to leave from his/her seat and the adjustment of the speed of the output shaft is rough.
The present invention intends to provide a speed adjusting device which has a control means to adjust a pressing device on the output shaft. The user simply operates the control means beside him/her to adjust the effective diameter of the belt in the variable pulley on the output shaft.
The present invention improves the shortcomings of the conventional speed adjusting device and the speed of the drill press can be adjusted steplessly.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, a speed adjusting device for a drill press is provided and comprises a first variable pulley composed of two first disks rotatably mounted to the motor shaft, a spring mounted to the motor shaft to push the two first disks toward each other. A second variable pulley comprising two second disks are rotatably mounted to the output shaft. A belt is connected between the first variable pulley and the second variable pulley.
A pressing member is mounted to the second variable pulley. A fixed member is pivotally connected to the first end of the pressing member and a control means is connected to the second end of the pressing member.
The main object of the present invention is to provide a speed adjusting device for a drill press wherein the effectively diameter of the belt in the two variable pulleys can be steplessly adjusted by operating a control means located beside the user.


REFERENCES:
patent: 3038438 (1962-06-01), Taylor et al.
patent: 3250141 (1966-05-01), Luenberger
patent: 3467177 (1969-09-01), Hoddinott
patent: 3718405 (1973-02-01), Keiter et al.
patent: 5061124 (1991-10-01), Chen

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