Spindle drive assembly for a surface-treating machine

• US 3,899,852 A
• Filed: 08/23/1974
• Issued: 08/19/1975
• Est. Priority Date: 08/23/1974
• Status: Expired due to Term

• Current Assignee: Ryobi Motor Products Incorporated (Techtronic Industries Company Limited)
• Original Assignee: William A. Batson
• Inventors: Batson, William A.
• Primary Examiner(s): Smith, Al Lawrence
• Assistant Examiner(s): Watson, Robert C.
• Application Number:
  US05/499,814
• Time in Patent Office: 361 Days
• Field of Search: 51/17T,17PT,17R 74/411.5,527 173/163
• US Class Current: 451/359
• CPC Class Codes: B24B 23/022 Spindle-locking devices, e.g. for mounting or removing the tool
• CPC Class Codes: B24B 23/028 Angle tools
• CPC Class Codes: Y10T 74/19637 with brake means for gearing
• CPC Class Codes: Y10T 74/20636 Detents

Abstract

A spindle drive assembly for a surface-treating machine driven by a portable electric motor mounted in a housing and having a drive pinion engaging said assembly. The spindle is journaled in the housing perpendicular to the drive pinion. A driven gear is affixed to and axially slidable along, the spindle in superposition to and in operative engagement with, the drive pinion. Face apertures are formed on the upper face of the driven gear and a pin carried by the housing is mounted normally out of engagement with the face apertures, but manually depressible into one of the face apertures to lock the driven gear and spindle against rotation. In the preferred embodiment the lock pin will be mounted in a removable cover, so as also to provide access for mounting the spindle. A resilient means such as a bellville washer, is disposed between the housing at the journal and the driven gear, so that on assembly tightening of the nut to affix the spindle and lock the driven gear in position may be suitably tightened to provide for a predetermined engagement between the drive pinion and the driven gear, whereby the pitch diameters of the respective pinion and gear substantially will lie at a predetermined location to permit transmission of maximum torque with minimum wear and backlash.

Claims

1. A spindle drive assembly for a surface-treating machine driven by a portable electric motor mounted in a housing and having a drive pinion engaging said assembly, said assembly comprising:

a. a spindle journaled in the housing perpendicular to the drive pinion, b. a driven gear affixed to the spindle in superposition to and in operative engagement with the drive pinion, c. face apertures formed on the side of the driven gear opposite the drive pinion, d. a pin carried by the housing for engaging any one of the face apertures, e. means connected to the pin to normally bias the pin in the direction away from the face apertures, and f. manually operated means formed on the pin for operator actuation in overcoming the bias means to urge the pin to engage one of the face apertures to lock the driven gear and the spindle against rotation.

2. The combination claimed in claim 1 wherein:

a. a gear chamber formed in the housing, b. the spindle mounted in the gear chamber, c. the gear chamber having an open top, and d. a cover means detachably connected to the housing to cover the open top of the gear chamber.

3. The combination claimed in claim 2 wherein:

a. the pin operatively connected to the cover means, b. spring means normally bias the pin out of engagement with the face apertures, and c. the pin disposed in superposition to the face apertures and is depressible into engagement with one of the face apertures to lock the driven gear and the spindle.

4. The combination claimed in claim 3 wherein:

a. the face apertures are formed with an axis parallel to the axis of the spindle, and b. the pin is depressibly mounted in the cover means with its axis parallel to the axis of the spindle.

5. A spindle drive assembly for a surface-treating machine having a work engaging member driven by a portable electric motor mounted in a housing and having a drive pinion driving the assembly, said assembly comprising:

a. a gear chamber formed in the housing, b. the gear chamber having an open portion, c. a cover detachably connected to the housing to enclose the open portion of the gear chamber, d. a spindle journaled in the gear chamber perpendicular to the drive pinion, e. a driven gear non-rotatively connected to and axially shiftable on the spindle, f. a resilient means interposed between the journal and the driven gear, g. the driven gear disposed in superposition to and operative engagement with the drive pinion, and h. connecting means affixed to the spindle to urge the driven gear in the direction of the resilient means to set the pitch diameter thereof for engagement with the drive pinion for transmission of maximum torque and minimum wear and backlash in said drive assembly.

6. The combination claimed in claim 5 wherein:

a. the driven gear having at least one aperture formed on its outer periphery, b. a pin mounted in the cover, c. spring means normally biasing the pin in the direction away from the driven gear, and d. the pin being depressible into engagement with the aperture to lock the driven gear and the spindle from rotation.

7. The combination claimed in claim 6 wherein:

a. the apertuRe formed on the upper face of the driven gear, b. a boss formed in the cover, c. the pin mounted in the boss, d. the spring means entrapped between the boss and the pin, e. the lower end of the pin extending below the boss in the direction of the driven gear, f. an annular groove formed on the lower end of the pin, and g. a snap ring connected into the annular groove to prevent removal of the pin from the boss and to limit the insertion of the lower end of the pin into the face aperture by seating upon the upper face of the driven gear.